/* * Copyright © 2008-2015 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. * * Authors: * Eric Anholt * */ #include #include #include #include "i915_drv.h" #include "i915_vgpu.h" #include "i915_trace.h" #include "intel_drv.h" #include #include #include #include #include #define RQ_BUG_ON(expr) static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj); static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj); static void i915_gem_object_retire__write(struct drm_i915_gem_object *obj); static void i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int ring); static bool cpu_cache_is_coherent(struct drm_device *dev, enum i915_cache_level level) { return HAS_LLC(dev) || level != I915_CACHE_NONE; } static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj) { if (!cpu_cache_is_coherent(obj->base.dev, obj->cache_level)) return true; return obj->pin_display; } /* some bookkeeping */ static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv, size_t size) { spin_lock(&dev_priv->mm.object_stat_lock); dev_priv->mm.object_count++; dev_priv->mm.object_memory += size; spin_unlock(&dev_priv->mm.object_stat_lock); } static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv, size_t size) { spin_lock(&dev_priv->mm.object_stat_lock); dev_priv->mm.object_count--; dev_priv->mm.object_memory -= size; spin_unlock(&dev_priv->mm.object_stat_lock); } static int i915_gem_wait_for_error(struct i915_gpu_error *error) { int ret; #define EXIT_COND (!i915_reset_in_progress(error) || \ i915_terminally_wedged(error)) if (EXIT_COND) return 0; /* * Only wait 10 seconds for the gpu reset to complete to avoid hanging * userspace. If it takes that long something really bad is going on and * we should simply try to bail out and fail as gracefully as possible. */ ret = wait_event_interruptible_timeout(error->reset_queue, EXIT_COND, 10*HZ); if (ret == 0) { DRM_ERROR("Timed out waiting for the gpu reset to complete\n"); return -EIO; } else if (ret < 0) { return ret; } #undef EXIT_COND return 0; } int i915_mutex_lock_interruptible(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; ret = i915_gem_wait_for_error(&dev_priv->gpu_error); if (ret) return ret; ret = mutex_lock_interruptible(&dev->struct_mutex); if (ret) return ret; WARN_ON(i915_verify_lists(dev)); return 0; } int i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_get_aperture *args = data; struct i915_gtt *ggtt = &dev_priv->gtt; struct i915_vma *vma; size_t pinned; pinned = 0; mutex_lock(&dev->struct_mutex); list_for_each_entry(vma, &ggtt->base.active_list, vm_link) if (vma->pin_count) pinned += vma->node.size; list_for_each_entry(vma, &ggtt->base.inactive_list, vm_link) if (vma->pin_count) pinned += vma->node.size; mutex_unlock(&dev->struct_mutex); args->aper_size = dev_priv->gtt.base.total; args->aper_available_size = args->aper_size - pinned; return 0; } static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj) { struct address_space *mapping = file_inode(obj->base.filp)->i_mapping; char *vaddr = obj->phys_handle->vaddr; struct sg_table *st; struct scatterlist *sg; int i; if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj))) return -EINVAL; for (i = 0; i < obj->base.size / PAGE_SIZE; i++) { struct page *page; char *src; page = shmem_read_mapping_page(mapping, i); if (IS_ERR(page)) return PTR_ERR(page); src = kmap_atomic(page); memcpy(vaddr, src, PAGE_SIZE); drm_clflush_virt_range(vaddr, PAGE_SIZE); kunmap_atomic(src); page_cache_release(page); vaddr += PAGE_SIZE; } i915_gem_chipset_flush(obj->base.dev); st = kmalloc(sizeof(*st), GFP_KERNEL); if (st == NULL) return -ENOMEM; if (sg_alloc_table(st, 1, GFP_KERNEL)) { kfree(st); return -ENOMEM; } sg = st->sgl; sg->offset = 0; sg->length = obj->base.size; sg_dma_address(sg) = obj->phys_handle->busaddr; sg_dma_len(sg) = obj->base.size; obj->pages = st; return 0; } static void i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj) { int ret; BUG_ON(obj->madv == __I915_MADV_PURGED); ret = i915_gem_object_set_to_cpu_domain(obj, true); if (ret) { /* In the event of a disaster, abandon all caches and * hope for the best. */ WARN_ON(ret != -EIO); obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU; } if (obj->madv == I915_MADV_DONTNEED) obj->dirty = 0; if (obj->dirty) { struct address_space *mapping = file_inode(obj->base.filp)->i_mapping; char *vaddr = obj->phys_handle->vaddr; int i; for (i = 0; i < obj->base.size / PAGE_SIZE; i++) { struct page *page; char *dst; page = shmem_read_mapping_page(mapping, i); if (IS_ERR(page)) continue; dst = kmap_atomic(page); drm_clflush_virt_range(vaddr, PAGE_SIZE); memcpy(dst, vaddr, PAGE_SIZE); kunmap_atomic(dst); set_page_dirty(page); if (obj->madv == I915_MADV_WILLNEED) mark_page_accessed(page); page_cache_release(page); vaddr += PAGE_SIZE; } obj->dirty = 0; } sg_free_table(obj->pages); kfree(obj->pages); } static void i915_gem_object_release_phys(struct drm_i915_gem_object *obj) { drm_pci_free(obj->base.dev, obj->phys_handle); } static const struct drm_i915_gem_object_ops i915_gem_phys_ops = { .get_pages = i915_gem_object_get_pages_phys, .put_pages = i915_gem_object_put_pages_phys, .release = i915_gem_object_release_phys, }; static int drop_pages(struct drm_i915_gem_object *obj) { struct i915_vma *vma, *next; int ret; drm_gem_object_reference(&obj->base); list_for_each_entry_safe(vma, next, &obj->vma_list, obj_link) if (i915_vma_unbind(vma)) break; ret = i915_gem_object_put_pages(obj); drm_gem_object_unreference(&obj->base); return ret; } int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align) { drm_dma_handle_t *phys; int ret; if (obj->phys_handle) { if ((unsigned long)obj->phys_handle->vaddr & (align -1)) return -EBUSY; return 0; } if (obj->madv != I915_MADV_WILLNEED) return -EFAULT; if (obj->base.filp == NULL) return -EINVAL; ret = drop_pages(obj); if (ret) return ret; /* create a new object */ phys = drm_pci_alloc(obj->base.dev, obj->base.size, align); if (!phys) return -ENOMEM; obj->phys_handle = phys; obj->ops = &i915_gem_phys_ops; return i915_gem_object_get_pages(obj); } static int i915_gem_phys_pwrite(struct drm_i915_gem_object *obj, struct drm_i915_gem_pwrite *args, struct drm_file *file_priv) { struct drm_device *dev = obj->base.dev; void *vaddr = obj->phys_handle->vaddr + args->offset; char __user *user_data = to_user_ptr(args->data_ptr); int ret = 0; /* We manually control the domain here and pretend that it * remains coherent i.e. in the GTT domain, like shmem_pwrite. */ ret = i915_gem_object_wait_rendering(obj, false); if (ret) return ret; intel_fb_obj_invalidate(obj, ORIGIN_CPU); if (__copy_from_user_inatomic_nocache(vaddr, user_data, args->size)) { unsigned long unwritten; /* The physical object once assigned is fixed for the lifetime * of the obj, so we can safely drop the lock and continue * to access vaddr. */ mutex_unlock(&dev->struct_mutex); unwritten = copy_from_user(vaddr, user_data, args->size); mutex_lock(&dev->struct_mutex); if (unwritten) { ret = -EFAULT; goto out; } } drm_clflush_virt_range(vaddr, args->size); i915_gem_chipset_flush(dev); out: intel_fb_obj_flush(obj, false, ORIGIN_CPU); return ret; } void *i915_gem_object_alloc(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; return kmem_cache_zalloc(dev_priv->objects, GFP_KERNEL); } void i915_gem_object_free(struct drm_i915_gem_object *obj) { struct drm_i915_private *dev_priv = obj->base.dev->dev_private; kmem_cache_free(dev_priv->objects, obj); } static int i915_gem_create(struct drm_file *file, struct drm_device *dev, uint64_t size, uint32_t *handle_p) { struct drm_i915_gem_object *obj; int ret; u32 handle; size = roundup(size, PAGE_SIZE); if (size == 0) return -EINVAL; /* Allocate the new object */ obj = i915_gem_alloc_object(dev, size); if (obj == NULL) return -ENOMEM; ret = drm_gem_handle_create(file, &obj->base, &handle); /* drop reference from allocate - handle holds it now */ drm_gem_object_unreference_unlocked(&obj->base); if (ret) return ret; *handle_p = handle; return 0; } int i915_gem_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args) { /* have to work out size/pitch and return them */ args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 64); args->size = args->pitch * args->height; return i915_gem_create(file, dev, args->size, &args->handle); } /** * Creates a new mm object and returns a handle to it. */ int i915_gem_create_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_create *args = data; return i915_gem_create(file, dev, args->size, &args->handle); } static inline int __copy_to_user_swizzled(char __user *cpu_vaddr, const char *gpu_vaddr, int gpu_offset, int length) { int ret, cpu_offset = 0; while (length > 0) { int cacheline_end = ALIGN(gpu_offset + 1, 64); int this_length = min(cacheline_end - gpu_offset, length); int swizzled_gpu_offset = gpu_offset ^ 64; ret = __copy_to_user(cpu_vaddr + cpu_offset, gpu_vaddr + swizzled_gpu_offset, this_length); if (ret) return ret + length; cpu_offset += this_length; gpu_offset += this_length; length -= this_length; } return 0; } static inline int __copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset, const char __user *cpu_vaddr, int length) { int ret, cpu_offset = 0; while (length > 0) { int cacheline_end = ALIGN(gpu_offset + 1, 64); int this_length = min(cacheline_end - gpu_offset, length); int swizzled_gpu_offset = gpu_offset ^ 64; ret = __copy_from_user(gpu_vaddr + swizzled_gpu_offset, cpu_vaddr + cpu_offset, this_length); if (ret) return ret + length; cpu_offset += this_length; gpu_offset += this_length; length -= this_length; } return 0; } /* * Pins the specified object's pages and synchronizes the object with * GPU accesses. Sets needs_clflush to non-zero if the caller should * flush the object from the CPU cache. */ int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj, int *needs_clflush) { int ret; *needs_clflush = 0; if (WARN_ON((obj->ops->flags & I915_GEM_OBJECT_HAS_STRUCT_PAGE) == 0)) return -EINVAL; if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) { /* If we're not in the cpu read domain, set ourself into the gtt * read domain and manually flush cachelines (if required). This * optimizes for the case when the gpu will dirty the data * anyway again before the next pread happens. */ *needs_clflush = !cpu_cache_is_coherent(obj->base.dev, obj->cache_level); ret = i915_gem_object_wait_rendering(obj, true); if (ret) return ret; } ret = i915_gem_object_get_pages(obj); if (ret) return ret; i915_gem_object_pin_pages(obj); return ret; } /* Per-page copy function for the shmem pread fastpath. * Flushes invalid cachelines before reading the target if * needs_clflush is set. */ static int shmem_pread_fast(struct page *page, int shmem_page_offset, int page_length, char __user *user_data, bool page_do_bit17_swizzling, bool needs_clflush) { char *vaddr; int ret; if (unlikely(page_do_bit17_swizzling)) return -EINVAL; vaddr = kmap_atomic(page); if (needs_clflush) drm_clflush_virt_range(vaddr + shmem_page_offset, page_length); ret = __copy_to_user_inatomic(user_data, vaddr + shmem_page_offset, page_length); kunmap_atomic(vaddr); return ret ? -EFAULT : 0; } static void shmem_clflush_swizzled_range(char *addr, unsigned long length, bool swizzled) { if (unlikely(swizzled)) { unsigned long start = (unsigned long) addr; unsigned long end = (unsigned long) addr + length; /* For swizzling simply ensure that we always flush both * channels. Lame, but simple and it works. Swizzled * pwrite/pread is far from a hotpath - current userspace * doesn't use it at all. */ start = round_down(start, 128); end = round_up(end, 128); drm_clflush_virt_range((void *)start, end - start); } else { drm_clflush_virt_range(addr, length); } } /* Only difference to the fast-path function is that this can handle bit17 * and uses non-atomic copy and kmap functions. */ static int shmem_pread_slow(struct page *page, int shmem_page_offset, int page_length, char __user *user_data, bool page_do_bit17_swizzling, bool needs_clflush) { char *vaddr; int ret; vaddr = kmap(page); if (needs_clflush) shmem_clflush_swizzled_range(vaddr + shmem_page_offset, page_length, page_do_bit17_swizzling); if (page_do_bit17_swizzling) ret = __copy_to_user_swizzled(user_data, vaddr, shmem_page_offset, page_length); else ret = __copy_to_user(user_data, vaddr + shmem_page_offset, page_length); kunmap(page); return ret ? - EFAULT : 0; } static int i915_gem_shmem_pread(struct drm_device *dev, struct drm_i915_gem_object *obj, struct drm_i915_gem_pread *args, struct drm_file *file) { char __user *user_data; ssize_t remain; loff_t offset; int shmem_page_offset, page_length, ret = 0; int obj_do_bit17_swizzling, page_do_bit17_swizzling; int prefaulted = 0; int needs_clflush = 0; struct sg_page_iter sg_iter; user_data = to_user_ptr(args->data_ptr); remain = args->size; obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj); ret = i915_gem_obj_prepare_shmem_read(obj, &needs_clflush); if (ret) return ret; offset = args->offset; for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, offset >> PAGE_SHIFT) { struct page *page = sg_page_iter_page(&sg_iter); if (remain <= 0) break; /* Operation in this page * * shmem_page_offset = offset within page in shmem file * page_length = bytes to copy for this page */ shmem_page_offset = offset_in_page(offset); page_length = remain; if ((shmem_page_offset + page_length) > PAGE_SIZE) page_length = PAGE_SIZE - shmem_page_offset; page_do_bit17_swizzling = obj_do_bit17_swizzling && (page_to_phys(page) & (1 << 17)) != 0; ret = shmem_pread_fast(page, shmem_page_offset, page_length, user_data, page_do_bit17_swizzling, needs_clflush); if (ret == 0) goto next_page; mutex_unlock(&dev->struct_mutex); if (likely(!i915.prefault_disable) && !prefaulted) { ret = fault_in_multipages_writeable(user_data, remain); /* Userspace is tricking us, but we've already clobbered * its pages with the prefault and promised to write the * data up to the first fault. Hence ignore any errors * and just continue. */ (void)ret; prefaulted = 1; } ret = shmem_pread_slow(page, shmem_page_offset, page_length, user_data, page_do_bit17_swizzling, needs_clflush); mutex_lock(&dev->struct_mutex); if (ret) goto out; next_page: remain -= page_length; user_data += page_length; offset += page_length; } out: i915_gem_object_unpin_pages(obj); return ret; } /** * Reads data from the object referenced by handle. * * On error, the contents of *data are undefined. */ int i915_gem_pread_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_pread *args = data; struct drm_i915_gem_object *obj; int ret = 0; if (args->size == 0) return 0; if (!access_ok(VERIFY_WRITE, to_user_ptr(args->data_ptr), args->size)) return -EFAULT; ret = i915_mutex_lock_interruptible(dev); if (ret) return ret; obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); if (&obj->base == NULL) { ret = -ENOENT; goto unlock; } /* Bounds check source. */ if (args->offset > obj->base.size || args->size > obj->base.size - args->offset) { ret = -EINVAL; goto out; } /* prime objects have no backing filp to GEM pread/pwrite * pages from. */ if (!obj->base.filp) { ret = -EINVAL; goto out; } trace_i915_gem_object_pread(obj, args->offset, args->size); ret = i915_gem_shmem_pread(dev, obj, args, file); out: drm_gem_object_unreference(&obj->base); unlock: mutex_unlock(&dev->struct_mutex); return ret; } /* This is the fast write path which cannot handle * page faults in the source data */ static inline int fast_user_write(struct io_mapping *mapping, loff_t page_base, int page_offset, char __user *user_data, int length) { void __iomem *vaddr_atomic; void *vaddr; unsigned long unwritten; vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base); /* We can use the cpu mem copy function because this is X86. */ vaddr = (void __force*)vaddr_atomic + page_offset; unwritten = __copy_from_user_inatomic_nocache(vaddr, user_data, length); io_mapping_unmap_atomic(vaddr_atomic); return unwritten; } /** * This is the fast pwrite path, where we copy the data directly from the * user into the GTT, uncached. */ static int i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_i915_gem_object *obj, struct drm_i915_gem_pwrite *args, struct drm_file *file) { struct drm_i915_private *dev_priv = dev->dev_private; ssize_t remain; loff_t offset, page_base; char __user *user_data; int page_offset, page_length, ret; ret = i915_gem_obj_ggtt_pin(obj, 0, PIN_MAPPABLE | PIN_NONBLOCK); if (ret) goto out; ret = i915_gem_object_set_to_gtt_domain(obj, true); if (ret) goto out_unpin; ret = i915_gem_object_put_fence(obj); if (ret) goto out_unpin; user_data = to_user_ptr(args->data_ptr); remain = args->size; offset = i915_gem_obj_ggtt_offset(obj) + args->offset; intel_fb_obj_invalidate(obj, ORIGIN_GTT); while (remain > 0) { /* Operation in this page * * page_base = page offset within aperture * page_offset = offset within page * page_length = bytes to copy for this page */ page_base = offset & PAGE_MASK; page_offset = offset_in_page(offset); page_length = remain; if ((page_offset + remain) > PAGE_SIZE) page_length = PAGE_SIZE - page_offset; /* If we get a fault while copying data, then (presumably) our * source page isn't available. Return the error and we'll * retry in the slow path. */ if (fast_user_write(dev_priv->gtt.mappable, page_base, page_offset, user_data, page_length)) { ret = -EFAULT; goto out_flush; } remain -= page_length; user_data += page_length; offset += page_length; } out_flush: intel_fb_obj_flush(obj, false, ORIGIN_GTT); out_unpin: i915_gem_object_ggtt_unpin(obj); out: return ret; } /* Per-page copy function for the shmem pwrite fastpath. * Flushes invalid cachelines before writing to the target if * needs_clflush_before is set and flushes out any written cachelines after * writing if needs_clflush is set. */ static int shmem_pwrite_fast(struct page *page, int shmem_page_offset, int page_length, char __user *user_data, bool page_do_bit17_swizzling, bool needs_clflush_before, bool needs_clflush_after) { char *vaddr; int ret; if (unlikely(page_do_bit17_swizzling)) return -EINVAL; vaddr = kmap_atomic(page); if (needs_clflush_before) drm_clflush_virt_range(vaddr + shmem_page_offset, page_length); ret = __copy_from_user_inatomic(vaddr + shmem_page_offset, user_data, page_length); if (needs_clflush_after) drm_clflush_virt_range(vaddr + shmem_page_offset, page_length); kunmap_atomic(vaddr); return ret ? -EFAULT : 0; } /* Only difference to the fast-path function is that this can handle bit17 * and uses non-atomic copy and kmap functions. */ static int shmem_pwrite_slow(struct page *page, int shmem_page_offset, int page_length, char __user *user_data, bool page_do_bit17_swizzling, bool needs_clflush_before, bool needs_clflush_after) { char *vaddr; int ret; vaddr = kmap(page); if (unlikely(needs_clflush_before || page_do_bit17_swizzling)) shmem_clflush_swizzled_range(vaddr + shmem_page_offset, page_length, page_do_bit17_swizzling); if (page_do_bit17_swizzling) ret = __copy_from_user_swizzled(vaddr, shmem_page_offset, user_data, page_length); else ret = __copy_from_user(vaddr + shmem_page_offset, user_data, page_length); if (needs_clflush_after) shmem_clflush_swizzled_range(vaddr + shmem_page_offset, page_length, page_do_bit17_swizzling); kunmap(page); return ret ? -EFAULT : 0; } static int i915_gem_shmem_pwrite(struct drm_device *dev, struct drm_i915_gem_object *obj, struct drm_i915_gem_pwrite *args, struct drm_file *file) { ssize_t remain; loff_t offset; char __user *user_data; int shmem_page_offset, page_length, ret = 0; int obj_do_bit17_swizzling, page_do_bit17_swizzling; int hit_slowpath = 0; int needs_clflush_after = 0; int needs_clflush_before = 0; struct sg_page_iter sg_iter; user_data = to_user_ptr(args->data_ptr); remain = args->size; obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj); if (obj->base.write_domain != I915_GEM_DOMAIN_CPU) { /* If we're not in the cpu write domain, set ourself into the gtt * write domain and manually flush cachelines (if required). This * optimizes for the case when the gpu will use the data * right away and we therefore have to clflush anyway. */ needs_clflush_after = cpu_write_needs_clflush(obj); ret = i915_gem_object_wait_rendering(obj, false); if (ret) return ret; } /* Same trick applies to invalidate partially written cachelines read * before writing. */ if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) needs_clflush_before = !cpu_cache_is_coherent(dev, obj->cache_level); ret = i915_gem_object_get_pages(obj); if (ret) return ret; intel_fb_obj_invalidate(obj, ORIGIN_CPU); i915_gem_object_pin_pages(obj); offset = args->offset; obj->dirty = 1; for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, offset >> PAGE_SHIFT) { struct page *page = sg_page_iter_page(&sg_iter); int partial_cacheline_write; if (remain <= 0) break; /* Operation in this page * * shmem_page_offset = offset within page in shmem file * page_length = bytes to copy for this page */ shmem_page_offset = offset_in_page(offset); page_length = remain; if ((shmem_page_offset + page_length) > PAGE_SIZE) page_length = PAGE_SIZE - shmem_page_offset; /* If we don't overwrite a cacheline completely we need to be * careful to have up-to-date data by first clflushing. Don't * overcomplicate things and flush the entire patch. */ partial_cacheline_write = needs_clflush_before && ((shmem_page_offset | page_length) & (boot_cpu_data.x86_clflush_size - 1)); page_do_bit17_swizzling = obj_do_bit17_swizzling && (page_to_phys(page) & (1 << 17)) != 0; ret = shmem_pwrite_fast(page, shmem_page_offset, page_length, user_data, page_do_bit17_swizzling, partial_cacheline_write, needs_clflush_after); if (ret == 0) goto next_page; hit_slowpath = 1; mutex_unlock(&dev->struct_mutex); ret = shmem_pwrite_slow(page, shmem_page_offset, page_length, user_data, page_do_bit17_swizzling, partial_cacheline_write, needs_clflush_after); mutex_lock(&dev->struct_mutex); if (ret) goto out; next_page: remain -= page_length; user_data += page_length; offset += page_length; } out: i915_gem_object_unpin_pages(obj); if (hit_slowpath) { /* * Fixup: Flush cpu caches in case we didn't flush the dirty * cachelines in-line while writing and the object moved * out of the cpu write domain while we've dropped the lock. */ if (!needs_clflush_after && obj->base.write_domain != I915_GEM_DOMAIN_CPU) { if (i915_gem_clflush_object(obj, obj->pin_display)) needs_clflush_after = true; } } if (needs_clflush_after) i915_gem_chipset_flush(dev); else obj->cache_dirty = true; intel_fb_obj_flush(obj, false, ORIGIN_CPU); return ret; } /** * Writes data to the object referenced by handle. * * On error, the contents of the buffer that were to be modified are undefined. */ int i915_gem_pwrite_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_pwrite *args = data; struct drm_i915_gem_object *obj; int ret; if (args->size == 0) return 0; if (!access_ok(VERIFY_READ, to_user_ptr(args->data_ptr), args->size)) return -EFAULT; if (likely(!i915.prefault_disable)) { ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr), args->size); if (ret) return -EFAULT; } intel_runtime_pm_get(dev_priv); ret = i915_mutex_lock_interruptible(dev); if (ret) goto put_rpm; obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); if (&obj->base == NULL) { ret = -ENOENT; goto unlock; } /* Bounds check destination. */ if (args->offset > obj->base.size || args->size > obj->base.size - args->offset) { ret = -EINVAL; goto out; } /* prime objects have no backing filp to GEM pread/pwrite * pages from. */ if (!obj->base.filp) { ret = -EINVAL; goto out; } trace_i915_gem_object_pwrite(obj, args->offset, args->size); ret = -EFAULT; /* We can only do the GTT pwrite on untiled buffers, as otherwise * it would end up going through the fenced access, and we'll get * different detiling behavior between reading and writing. * pread/pwrite currently are reading and writing from the CPU * perspective, requiring manual detiling by the client. */ if (obj->tiling_mode == I915_TILING_NONE && obj->base.write_domain != I915_GEM_DOMAIN_CPU && cpu_write_needs_clflush(obj)) { ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file); /* Note that the gtt paths might fail with non-page-backed user * pointers (e.g. gtt mappings when moving data between * textures). Fallback to the shmem path in that case. */ } if (ret == -EFAULT || ret == -ENOSPC) { if (obj->phys_handle) ret = i915_gem_phys_pwrite(obj, args, file); else ret = i915_gem_shmem_pwrite(dev, obj, args, file); } out: drm_gem_object_unreference(&obj->base); unlock: mutex_unlock(&dev->struct_mutex); put_rpm: intel_runtime_pm_put(dev_priv); return ret; } int i915_gem_check_wedge(struct i915_gpu_error *error, bool interruptible) { if (i915_reset_in_progress(error)) { /* Non-interruptible callers can't handle -EAGAIN, hence return * -EIO unconditionally for these. */ if (!interruptible) return -EIO; /* Recovery complete, but the reset failed ... */ if (i915_terminally_wedged(error)) return -EIO; /* * Check if GPU Reset is in progress - we need intel_ring_begin * to work properly to reinit the hw state while the gpu is * still marked as reset-in-progress. Handle this with a flag. */ if (!error->reload_in_reset) return -EAGAIN; } return 0; } static void fake_irq(unsigned long data) { wake_up_process((struct task_struct *)data); } static bool missed_irq(struct drm_i915_private *dev_priv, struct intel_engine_cs *ring) { return test_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings); } static unsigned long local_clock_us(unsigned *cpu) { unsigned long t; /* Cheaply and approximately convert from nanoseconds to microseconds. * The result and subsequent calculations are also defined in the same * approximate microseconds units. The principal source of timing * error here is from the simple truncation. * * Note that local_clock() is only defined wrt to the current CPU; * the comparisons are no longer valid if we switch CPUs. Instead of * blocking preemption for the entire busywait, we can detect the CPU * switch and use that as indicator of system load and a reason to * stop busywaiting, see busywait_stop(). */ *cpu = get_cpu(); t = local_clock() >> 10; put_cpu(); return t; } static bool busywait_stop(unsigned long timeout, unsigned cpu) { unsigned this_cpu; if (time_after(local_clock_us(&this_cpu), timeout)) return true; return this_cpu != cpu; } static int __i915_spin_request(struct drm_i915_gem_request *req, int state) { unsigned long timeout; unsigned cpu; /* When waiting for high frequency requests, e.g. during synchronous * rendering split between the CPU and GPU, the finite amount of time * required to set up the irq and wait upon it limits the response * rate. By busywaiting on the request completion for a short while we * can service the high frequency waits as quick as possible. However, * if it is a slow request, we want to sleep as quickly as possible. * The tradeoff between waiting and sleeping is roughly the time it * takes to sleep on a request, on the order of a microsecond. */ if (req->ring->irq_refcount) return -EBUSY; /* Only spin if we know the GPU is processing this request */ if (!i915_gem_request_started(req, true)) return -EAGAIN; timeout = local_clock_us(&cpu) + 5; while (!need_resched()) { if (i915_gem_request_completed(req, true)) return 0; if (signal_pending_state(state, current)) break; if (busywait_stop(timeout, cpu)) break; cpu_relax_lowlatency(); } if (i915_gem_request_completed(req, false)) return 0; return -EAGAIN; } /** * __i915_wait_request - wait until execution of request has finished * @req: duh! * @reset_counter: reset sequence associated with the given request * @interruptible: do an interruptible wait (normally yes) * @timeout: in - how long to wait (NULL forever); out - how much time remaining * * Note: It is of utmost importance that the passed in seqno and reset_counter * values have been read by the caller in an smp safe manner. Where read-side * locks are involved, it is sufficient to read the reset_counter before * unlocking the lock that protects the seqno. For lockless tricks, the * reset_counter _must_ be read before, and an appropriate smp_rmb must be * inserted. * * Returns 0 if the request was found within the alloted time. Else returns the * errno with remaining time filled in timeout argument. */ int __i915_wait_request(struct drm_i915_gem_request *req, unsigned reset_counter, bool interruptible, s64 *timeout, struct intel_rps_client *rps) { struct intel_engine_cs *ring = i915_gem_request_get_ring(req); struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; const bool irq_test_in_progress = ACCESS_ONCE(dev_priv->gpu_error.test_irq_rings) & intel_ring_flag(ring); int state = interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE; DEFINE_WAIT(wait); unsigned long timeout_expire; s64 before = 0; /* Only to silence a compiler warning. */ int ret; WARN(!intel_irqs_enabled(dev_priv), "IRQs disabled"); if (list_empty(&req->list)) return 0; if (i915_gem_request_completed(req, true)) return 0; timeout_expire = 0; if (timeout) { if (WARN_ON(*timeout < 0)) return -EINVAL; if (*timeout == 0) return -ETIME; timeout_expire = jiffies + nsecs_to_jiffies_timeout(*timeout); /* * Record current time in case interrupted by signal, or wedged. */ before = ktime_get_raw_ns(); } if (INTEL_INFO(dev_priv)->gen >= 6) gen6_rps_boost(dev_priv, rps, req->emitted_jiffies); trace_i915_gem_request_wait_begin(req); /* Optimistic spin for the next jiffie before touching IRQs */ ret = __i915_spin_request(req, state); if (ret == 0) goto out; if (!irq_test_in_progress && WARN_ON(!ring->irq_get(ring))) { ret = -ENODEV; goto out; } for (;;) { struct timer_list timer; prepare_to_wait(&ring->irq_queue, &wait, state); /* We need to check whether any gpu reset happened in between * the caller grabbing the seqno and now ... */ if (reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter)) { /* ... but upgrade the -EAGAIN to an -EIO if the gpu * is truely gone. */ ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible); if (ret == 0) ret = -EAGAIN; break; } if (i915_gem_request_completed(req, false)) { ret = 0; break; } if (signal_pending_state(state, current)) { ret = -ERESTARTSYS; break; } if (timeout && time_after_eq(jiffies, timeout_expire)) { ret = -ETIME; break; } timer.function = NULL; if (timeout || missed_irq(dev_priv, ring)) { unsigned long expire; setup_timer_on_stack(&timer, fake_irq, (unsigned long)current); expire = missed_irq(dev_priv, ring) ? jiffies + 1 : timeout_expire; mod_timer(&timer, expire); } io_schedule(); if (timer.function) { del_singleshot_timer_sync(&timer); destroy_timer_on_stack(&timer); } } if (!irq_test_in_progress) ring->irq_put(ring); finish_wait(&ring->irq_queue, &wait); out: trace_i915_gem_request_wait_end(req); if (timeout) { s64 tres = *timeout - (ktime_get_raw_ns() - before); *timeout = tres < 0 ? 0 : tres; /* * Apparently ktime isn't accurate enough and occasionally has a * bit of mismatch in the jiffies<->nsecs<->ktime loop. So patch * things up to make the test happy. We allow up to 1 jiffy. * * This is a regrssion from the timespec->ktime conversion. */ if (ret == -ETIME && *timeout < jiffies_to_usecs(1)*1000) *timeout = 0; } return ret; } int i915_gem_request_add_to_client(struct drm_i915_gem_request *req, struct drm_file *file) { struct drm_i915_private *dev_private; struct drm_i915_file_private *file_priv; WARN_ON(!req || !file || req->file_priv); if (!req || !file) return -EINVAL; if (req->file_priv) return -EINVAL; dev_private = req->ring->dev->dev_private; file_priv = file->driver_priv; spin_lock(&file_priv->mm.lock); req->file_priv = file_priv; list_add_tail(&req->client_list, &file_priv->mm.request_list); spin_unlock(&file_priv->mm.lock); req->pid = get_pid(task_pid(current)); return 0; } static inline void i915_gem_request_remove_from_client(struct drm_i915_gem_request *request) { struct drm_i915_file_private *file_priv = request->file_priv; if (!file_priv) return; spin_lock(&file_priv->mm.lock); list_del(&request->client_list); request->file_priv = NULL; spin_unlock(&file_priv->mm.lock); put_pid(request->pid); request->pid = NULL; } static void i915_gem_request_retire(struct drm_i915_gem_request *request) { trace_i915_gem_request_retire(request); /* We know the GPU must have read the request to have * sent us the seqno + interrupt, so use the position * of tail of the request to update the last known position * of the GPU head. * * Note this requires that we are always called in request * completion order. */ request->ringbuf->last_retired_head = request->postfix; list_del_init(&request->list); i915_gem_request_remove_from_client(request); i915_gem_request_unreference(request); } static void __i915_gem_request_retire__upto(struct drm_i915_gem_request *req) { struct intel_engine_cs *engine = req->ring; struct drm_i915_gem_request *tmp; lockdep_assert_held(&engine->dev->struct_mutex); if (list_empty(&req->list)) return; do { tmp = list_first_entry(&engine->request_list, typeof(*tmp), list); i915_gem_request_retire(tmp); } while (tmp != req); WARN_ON(i915_verify_lists(engine->dev)); } /** * Waits for a request to be signaled, and cleans up the * request and object lists appropriately for that event. */ int i915_wait_request(struct drm_i915_gem_request *req) { struct drm_device *dev; struct drm_i915_private *dev_priv; bool interruptible; int ret; BUG_ON(req == NULL); dev = req->ring->dev; dev_priv = dev->dev_private; interruptible = dev_priv->mm.interruptible; BUG_ON(!mutex_is_locked(&dev->struct_mutex)); ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible); if (ret) return ret; ret = __i915_wait_request(req, atomic_read(&dev_priv->gpu_error.reset_counter), interruptible, NULL, NULL); if (ret) return ret; __i915_gem_request_retire__upto(req); return 0; } /** * Ensures that all rendering to the object has completed and the object is * safe to unbind from the GTT or access from the CPU. */ int i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj, bool readonly) { int ret, i; if (!obj->active) return 0; if (readonly) { if (obj->last_write_req != NULL) { ret = i915_wait_request(obj->last_write_req); if (ret) return ret; i = obj->last_write_req->ring->id; if (obj->last_read_req[i] == obj->last_write_req) i915_gem_object_retire__read(obj, i); else i915_gem_object_retire__write(obj); } } else { for (i = 0; i < I915_NUM_RINGS; i++) { if (obj->last_read_req[i] == NULL) continue; ret = i915_wait_request(obj->last_read_req[i]); if (ret) return ret; i915_gem_object_retire__read(obj, i); } RQ_BUG_ON(obj->active); } return 0; } static void i915_gem_object_retire_request(struct drm_i915_gem_object *obj, struct drm_i915_gem_request *req) { int ring = req->ring->id; if (obj->last_read_req[ring] == req) i915_gem_object_retire__read(obj, ring); else if (obj->last_write_req == req) i915_gem_object_retire__write(obj); __i915_gem_request_retire__upto(req); } /* A nonblocking variant of the above wait. This is a highly dangerous routine * as the object state may change during this call. */ static __must_check int i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj, struct intel_rps_client *rps, bool readonly) { struct drm_device *dev = obj->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_request *requests[I915_NUM_RINGS]; unsigned reset_counter; int ret, i, n = 0; BUG_ON(!mutex_is_locked(&dev->struct_mutex)); BUG_ON(!dev_priv->mm.interruptible); if (!obj->active) return 0; ret = i915_gem_check_wedge(&dev_priv->gpu_error, true); if (ret) return ret; reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter); if (readonly) { struct drm_i915_gem_request *req; req = obj->last_write_req; if (req == NULL) return 0; requests[n++] = i915_gem_request_reference(req); } else { for (i = 0; i < I915_NUM_RINGS; i++) { struct drm_i915_gem_request *req; req = obj->last_read_req[i]; if (req == NULL) continue; requests[n++] = i915_gem_request_reference(req); } } mutex_unlock(&dev->struct_mutex); for (i = 0; ret == 0 && i < n; i++) ret = __i915_wait_request(requests[i], reset_counter, true, NULL, rps); mutex_lock(&dev->struct_mutex); for (i = 0; i < n; i++) { if (ret == 0) i915_gem_object_retire_request(obj, requests[i]); i915_gem_request_unreference(requests[i]); } return ret; } static struct intel_rps_client *to_rps_client(struct drm_file *file) { struct drm_i915_file_private *fpriv = file->driver_priv; return &fpriv->rps; } /** * Called when user space prepares to use an object with the CPU, either * through the mmap ioctl's mapping or a GTT mapping. */ int i915_gem_set_domain_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_set_domain *args = data; struct drm_i915_gem_object *obj; uint32_t read_domains = args->read_domains; uint32_t write_domain = args->write_domain; int ret; /* Only handle setting domains to types used by the CPU. */ if (write_domain & I915_GEM_GPU_DOMAINS) return -EINVAL; if (read_domains & I915_GEM_GPU_DOMAINS) return -EINVAL; /* Having something in the write domain implies it's in the read * domain, and only that read domain. Enforce that in the request. */ if (write_domain != 0 && read_domains != write_domain) return -EINVAL; ret = i915_mutex_lock_interruptible(dev); if (ret) return ret; obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); if (&obj->base == NULL) { ret = -ENOENT; goto unlock; } /* Try to flush the object off the GPU without holding the lock. * We will repeat the flush holding the lock in the normal manner * to catch cases where we are gazumped. */ ret = i915_gem_object_wait_rendering__nonblocking(obj, to_rps_client(file), !write_domain); if (ret) goto unref; if (read_domains & I915_GEM_DOMAIN_GTT) ret = i915_gem_object_set_to_gtt_domain(obj, write_domain != 0); else ret = i915_gem_object_set_to_cpu_domain(obj, write_domain != 0); if (write_domain != 0) intel_fb_obj_invalidate(obj, write_domain == I915_GEM_DOMAIN_GTT ? ORIGIN_GTT : ORIGIN_CPU); unref: drm_gem_object_unreference(&obj->base); unlock: mutex_unlock(&dev->struct_mutex); return ret; } /** * Called when user space has done writes to this buffer */ int i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_sw_finish *args = data; struct drm_i915_gem_object *obj; int ret = 0; ret = i915_mutex_lock_interruptible(dev); if (ret) return ret; obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); if (&obj->base == NULL) { ret = -ENOENT; goto unlock; } /* Pinned buffers may be scanout, so flush the cache */ if (obj->pin_display) i915_gem_object_flush_cpu_write_domain(obj); drm_gem_object_unreference(&obj->base); unlock: mutex_unlock(&dev->struct_mutex); return ret; } /** * Maps the contents of an object, returning the address it is mapped * into. * * While the mapping holds a reference on the contents of the object, it doesn't * imply a ref on the object itself. * * IMPORTANT: * * DRM driver writers who look a this function as an example for how to do GEM * mmap support, please don't implement mmap support like here. The modern way * to implement DRM mmap support is with an mmap offset ioctl (like * i915_gem_mmap_gtt) and then using the mmap syscall on the DRM fd directly. * That way debug tooling like valgrind will understand what's going on, hiding * the mmap call in a driver private ioctl will break that. The i915 driver only * does cpu mmaps this way because we didn't know better. */ int i915_gem_mmap_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_mmap *args = data; struct drm_gem_object *obj; unsigned long addr; if (args->flags & ~(I915_MMAP_WC)) return -EINVAL; if (args->flags & I915_MMAP_WC && !cpu_has_pat) return -ENODEV; obj = drm_gem_object_lookup(dev, file, args->handle); if (obj == NULL) return -ENOENT; /* prime objects have no backing filp to GEM mmap * pages from. */ if (!obj->filp) { drm_gem_object_unreference_unlocked(obj); return -EINVAL; } addr = vm_mmap(obj->filp, 0, args->size, PROT_READ | PROT_WRITE, MAP_SHARED, args->offset); if (args->flags & I915_MMAP_WC) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; down_write(&mm->mmap_sem); vma = find_vma(mm, addr); if (vma) vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); else addr = -ENOMEM; up_write(&mm->mmap_sem); } drm_gem_object_unreference_unlocked(obj); if (IS_ERR((void *)addr)) return addr; args->addr_ptr = (uint64_t) addr; return 0; } /** * i915_gem_fault - fault a page into the GTT * @vma: VMA in question * @vmf: fault info * * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped * from userspace. The fault handler takes care of binding the object to * the GTT (if needed), allocating and programming a fence register (again, * only if needed based on whether the old reg is still valid or the object * is tiled) and inserting a new PTE into the faulting process. * * Note that the faulting process may involve evicting existing objects * from the GTT and/or fence registers to make room. So performance may * suffer if the GTT working set is large or there are few fence registers * left. */ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct drm_i915_gem_object *obj = to_intel_bo(vma->vm_private_data); struct drm_device *dev = obj->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct i915_ggtt_view view = i915_ggtt_view_normal; pgoff_t page_offset; unsigned long pfn; int ret = 0; bool write = !!(vmf->flags & FAULT_FLAG_WRITE); intel_runtime_pm_get(dev_priv); /* We don't use vmf->pgoff since that has the fake offset */ page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >> PAGE_SHIFT; ret = i915_mutex_lock_interruptible(dev); if (ret) goto out; trace_i915_gem_object_fault(obj, page_offset, true, write); /* Try to flush the object off the GPU first without holding the lock. * Upon reacquiring the lock, we will perform our sanity checks and then * repeat the flush holding the lock in the normal manner to catch cases * where we are gazumped. */ ret = i915_gem_object_wait_rendering__nonblocking(obj, NULL, !write); if (ret) goto unlock; /* Access to snoopable pages through the GTT is incoherent. */ if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(dev)) { ret = -EFAULT; goto unlock; } /* Use a partial view if the object is bigger than the aperture. */ if (obj->base.size >= dev_priv->gtt.mappable_end && obj->tiling_mode == I915_TILING_NONE) { static const unsigned int chunk_size = 256; // 1 MiB memset(&view, 0, sizeof(view)); view.type = I915_GGTT_VIEW_PARTIAL; view.params.partial.offset = rounddown(page_offset, chunk_size); view.params.partial.size = min_t(unsigned int, chunk_size, (vma->vm_end - vma->vm_start)/PAGE_SIZE - view.params.partial.offset); } /* Now pin it into the GTT if needed */ ret = i915_gem_object_ggtt_pin(obj, &view, 0, PIN_MAPPABLE); if (ret) goto unlock; ret = i915_gem_object_set_to_gtt_domain(obj, write); if (ret) goto unpin; ret = i915_gem_object_get_fence(obj); if (ret) goto unpin; /* Finally, remap it using the new GTT offset */ pfn = dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset_view(obj, &view); pfn >>= PAGE_SHIFT; if (unlikely(view.type == I915_GGTT_VIEW_PARTIAL)) { /* Overriding existing pages in partial view does not cause * us any trouble as TLBs are still valid because the fault * is due to userspace losing part of the mapping or never * having accessed it before (at this partials' range). */ unsigned long base = vma->vm_start + (view.params.partial.offset << PAGE_SHIFT); unsigned int i; for (i = 0; i < view.params.partial.size; i++) { ret = vm_insert_pfn(vma, base + i * PAGE_SIZE, pfn + i); if (ret) break; } obj->fault_mappable = true; } else { if (!obj->fault_mappable) { unsigned long size = min_t(unsigned long, vma->vm_end - vma->vm_start, obj->base.size); int i; for (i = 0; i < size >> PAGE_SHIFT; i++) { ret = vm_insert_pfn(vma, (unsigned long)vma->vm_start + i * PAGE_SIZE, pfn + i); if (ret) break; } obj->fault_mappable = true; } else ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn + page_offset); } unpin: i915_gem_object_ggtt_unpin_view(obj, &view); unlock: mutex_unlock(&dev->struct_mutex); out: switch (ret) { case -EIO: /* * We eat errors when the gpu is terminally wedged to avoid * userspace unduly crashing (gl has no provisions for mmaps to * fail). But any other -EIO isn't ours (e.g. swap in failure) * and so needs to be reported. */ if (!i915_terminally_wedged(&dev_priv->gpu_error)) { ret = VM_FAULT_SIGBUS; break; } case -EAGAIN: /* * EAGAIN means the gpu is hung and we'll wait for the error * handler to reset everything when re-faulting in * i915_mutex_lock_interruptible. */ case 0: case -ERESTARTSYS: case -EINTR: case -EBUSY: /* * EBUSY is ok: this just means that another thread * already did the job. */ ret = VM_FAULT_NOPAGE; break; case -ENOMEM: ret = VM_FAULT_OOM; break; case -ENOSPC: case -EFAULT: ret = VM_FAULT_SIGBUS; break; default: WARN_ONCE(ret, "unhandled error in i915_gem_fault: %i\n", ret); ret = VM_FAULT_SIGBUS; break; } intel_runtime_pm_put(dev_priv); return ret; } /** * i915_gem_release_mmap - remove physical page mappings * @obj: obj in question * * Preserve the reservation of the mmapping with the DRM core code, but * relinquish ownership of the pages back to the system. * * It is vital that we remove the page mapping if we have mapped a tiled * object through the GTT and then lose the fence register due to * resource pressure. Similarly if the object has been moved out of the * aperture, than pages mapped into userspace must be revoked. Removing the * mapping will then trigger a page fault on the next user access, allowing * fixup by i915_gem_fault(). */ void i915_gem_release_mmap(struct drm_i915_gem_object *obj) { if (!obj->fault_mappable) return; drm_vma_node_unmap(&obj->base.vma_node, obj->base.dev->anon_inode->i_mapping); obj->fault_mappable = false; } void i915_gem_release_all_mmaps(struct drm_i915_private *dev_priv) { struct drm_i915_gem_object *obj; list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) i915_gem_release_mmap(obj); } uint32_t i915_gem_get_gtt_size(struct drm_device *dev, uint32_t size, int tiling_mode) { uint32_t gtt_size; if (INTEL_INFO(dev)->gen >= 4 || tiling_mode == I915_TILING_NONE) return size; /* Previous chips need a power-of-two fence region when tiling */ if (INTEL_INFO(dev)->gen == 3) gtt_size = 1024*1024; else gtt_size = 512*1024; while (gtt_size < size) gtt_size <<= 1; return gtt_size; } /** * i915_gem_get_gtt_alignment - return required GTT alignment for an object * @obj: object to check * * Return the required GTT alignment for an object, taking into account * potential fence register mapping. */ uint32_t i915_gem_get_gtt_alignment(struct drm_device *dev, uint32_t size, int tiling_mode, bool fenced) { /* * Minimum alignment is 4k (GTT page size), but might be greater * if a fence register is needed for the object. */ if (INTEL_INFO(dev)->gen >= 4 || (!fenced && IS_G33(dev)) || tiling_mode == I915_TILING_NONE) return 4096; /* * Previous chips need to be aligned to the size of the smallest * fence register that can contain the object. */ return i915_gem_get_gtt_size(dev, size, tiling_mode); } static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj) { struct drm_i915_private *dev_priv = obj->base.dev->dev_private; int ret; if (drm_vma_node_has_offset(&obj->base.vma_node)) return 0; dev_priv->mm.shrinker_no_lock_stealing = true; ret = drm_gem_create_mmap_offset(&obj->base); if (ret != -ENOSPC) goto out; /* Badly fragmented mmap space? The only way we can recover * space is by destroying unwanted objects. We can't randomly release * mmap_offsets as userspace expects them to be persistent for the * lifetime of the objects. The closest we can is to release the * offsets on purgeable objects by truncating it and marking it purged, * which prevents userspace from ever using that object again. */ i915_gem_shrink(dev_priv, obj->base.size >> PAGE_SHIFT, I915_SHRINK_BOUND | I915_SHRINK_UNBOUND | I915_SHRINK_PURGEABLE); ret = drm_gem_create_mmap_offset(&obj->base); if (ret != -ENOSPC) goto out; i915_gem_shrink_all(dev_priv); ret = drm_gem_create_mmap_offset(&obj->base); out: dev_priv->mm.shrinker_no_lock_stealing = false; return ret; } static void i915_gem_object_free_mmap_offset(struct drm_i915_gem_object *obj) { drm_gem_free_mmap_offset(&obj->base); } int i915_gem_mmap_gtt(struct drm_file *file, struct drm_device *dev, uint32_t handle, uint64_t *offset) { struct drm_i915_gem_object *obj; int ret; ret = i915_mutex_lock_interruptible(dev); if (ret) return ret; obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle)); if (&obj->base == NULL) { ret = -ENOENT; goto unlock; } if (obj->madv != I915_MADV_WILLNEED) { DRM_DEBUG("Attempting to mmap a purgeable buffer\n"); ret = -EFAULT; goto out; } ret = i915_gem_object_create_mmap_offset(obj); if (ret) goto out; *offset = drm_vma_node_offset_addr(&obj->base.vma_node); out: drm_gem_object_unreference(&obj->base); unlock: mutex_unlock(&dev->struct_mutex); return ret; } /** * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing * @dev: DRM device * @data: GTT mapping ioctl data * @file: GEM object info * * Simply returns the fake offset to userspace so it can mmap it. * The mmap call will end up in drm_gem_mmap(), which will set things * up so we can get faults in the handler above. * * The fault handler will take care of binding the object into the GTT * (since it may have been evicted to make room for something), allocating * a fence register, and mapping the appropriate aperture address into * userspace. */ int i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_mmap_gtt *args = data; return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset); } /* Immediately discard the backing storage */ static void i915_gem_object_truncate(struct drm_i915_gem_object *obj) { i915_gem_object_free_mmap_offset(obj); if (obj->base.filp == NULL) return; /* Our goal here is to return as much of the memory as * is possible back to the system as we are called from OOM. * To do this we must instruct the shmfs to drop all of its * backing pages, *now*. */ shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1); obj->madv = __I915_MADV_PURGED; } /* Try to discard unwanted pages */ static void i915_gem_object_invalidate(struct drm_i915_gem_object *obj) { struct address_space *mapping; switch (obj->madv) { case I915_MADV_DONTNEED: i915_gem_object_truncate(obj); case __I915_MADV_PURGED: return; } if (obj->base.filp == NULL) return; mapping = file_inode(obj->base.filp)->i_mapping, invalidate_mapping_pages(mapping, 0, (loff_t)-1); } static void i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj) { struct sg_page_iter sg_iter; int ret; BUG_ON(obj->madv == __I915_MADV_PURGED); ret = i915_gem_object_set_to_cpu_domain(obj, true); if (ret) { /* In the event of a disaster, abandon all caches and * hope for the best. */ WARN_ON(ret != -EIO); i915_gem_clflush_object(obj, true); obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU; } i915_gem_gtt_finish_object(obj); if (i915_gem_object_needs_bit17_swizzle(obj)) i915_gem_object_save_bit_17_swizzle(obj); if (obj->madv == I915_MADV_DONTNEED) obj->dirty = 0; for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) { struct page *page = sg_page_iter_page(&sg_iter); if (obj->dirty) set_page_dirty(page); if (obj->madv == I915_MADV_WILLNEED) mark_page_accessed(page); page_cache_release(page); } obj->dirty = 0; sg_free_table(obj->pages); kfree(obj->pages); } int i915_gem_object_put_pages(struct drm_i915_gem_object *obj) { const struct drm_i915_gem_object_ops *ops = obj->ops; if (obj->pages == NULL) return 0; if (obj->pages_pin_count) return -EBUSY; BUG_ON(i915_gem_obj_bound_any(obj)); /* ->put_pages might need to allocate memory for the bit17 swizzle * array, hence protect them from being reaped by removing them from gtt * lists early. */ list_del(&obj->global_list); ops->put_pages(obj); obj->pages = NULL; i915_gem_object_invalidate(obj); return 0; } static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj) { struct drm_i915_private *dev_priv = obj->base.dev->dev_private; int page_count, i; struct address_space *mapping; struct sg_table *st; struct scatterlist *sg; struct sg_page_iter sg_iter; struct page *page; unsigned long last_pfn = 0; /* suppress gcc warning */ int ret; gfp_t gfp; /* Assert that the object is not currently in any GPU domain. As it * wasn't in the GTT, there shouldn't be any way it could have been in * a GPU cache */ BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS); BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS); st = kmalloc(sizeof(*st), GFP_KERNEL); if (st == NULL) return -ENOMEM; page_count = obj->base.size / PAGE_SIZE; if (sg_alloc_table(st, page_count, GFP_KERNEL)) { kfree(st); return -ENOMEM; } /* Get the list of pages out of our struct file. They'll be pinned * at this point until we release them. * * Fail silently without starting the shrinker */ mapping = file_inode(obj->base.filp)->i_mapping; gfp = mapping_gfp_constraint(mapping, ~(__GFP_IO | __GFP_RECLAIM)); gfp |= __GFP_NORETRY | __GFP_NOWARN; sg = st->sgl; st->nents = 0; for (i = 0; i < page_count; i++) { page = shmem_read_mapping_page_gfp(mapping, i, gfp); if (IS_ERR(page)) { i915_gem_shrink(dev_priv, page_count, I915_SHRINK_BOUND | I915_SHRINK_UNBOUND | I915_SHRINK_PURGEABLE); page = shmem_read_mapping_page_gfp(mapping, i, gfp); } if (IS_ERR(page)) { /* We've tried hard to allocate the memory by reaping * our own buffer, now let the real VM do its job and * go down in flames if truly OOM. */ i915_gem_shrink_all(dev_priv); page = shmem_read_mapping_page(mapping, i); if (IS_ERR(page)) { ret = PTR_ERR(page); goto err_pages; } } #ifdef CONFIG_SWIOTLB if (swiotlb_nr_tbl()) { st->nents++; sg_set_page(sg, page, PAGE_SIZE, 0); sg = sg_next(sg); continue; } #endif if (!i || page_to_pfn(page) != last_pfn + 1) { if (i) sg = sg_next(sg); st->nents++; sg_set_page(sg, page, PAGE_SIZE, 0); } else { sg->length += PAGE_SIZE; } last_pfn = page_to_pfn(page); /* Check that the i965g/gm workaround works. */ WARN_ON((gfp & __GFP_DMA32) && (last_pfn >= 0x00100000UL)); } #ifdef CONFIG_SWIOTLB if (!swiotlb_nr_tbl()) #endif sg_mark_end(sg); obj->pages = st; ret = i915_gem_gtt_prepare_object(obj); if (ret) goto err_pages; if (i915_gem_object_needs_bit17_swizzle(obj)) i915_gem_object_do_bit_17_swizzle(obj); if (obj->tiling_mode != I915_TILING_NONE && dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) i915_gem_object_pin_pages(obj); return 0; err_pages: sg_mark_end(sg); for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) page_cache_release(sg_page_iter_page(&sg_iter)); sg_free_table(st); kfree(st); /* shmemfs first checks if there is enough memory to allocate the page * and reports ENOSPC should there be insufficient, along with the usual * ENOMEM for a genuine allocation failure. * * We use ENOSPC in our driver to mean that we have run out of aperture * space and so want to translate the error from shmemfs back to our * usual understanding of ENOMEM. */ if (ret == -ENOSPC) ret = -ENOMEM; return ret; } /* Ensure that the associated pages are gathered from the backing storage * and pinned into our object. i915_gem_object_get_pages() may be called * multiple times before they are released by a single call to * i915_gem_object_put_pages() - once the pages are no longer referenced * either as a result of memory pressure (reaping pages under the shrinker) * or as the object is itself released. */ int i915_gem_object_get_pages(struct drm_i915_gem_object *obj) { struct drm_i915_private *dev_priv = obj->base.dev->dev_private; const struct drm_i915_gem_object_ops *ops = obj->ops; int ret; if (obj->pages) return 0; if (obj->madv != I915_MADV_WILLNEED) { DRM_DEBUG("Attempting to obtain a purgeable object\n"); return -EFAULT; } BUG_ON(obj->pages_pin_count); ret = ops->get_pages(obj); if (ret) return ret; list_add_tail(&obj->global_list, &dev_priv->mm.unbound_list); obj->get_page.sg = obj->pages->sgl; obj->get_page.last = 0; return 0; } void i915_vma_move_to_active(struct i915_vma *vma, struct drm_i915_gem_request *req) { struct drm_i915_gem_object *obj = vma->obj; struct intel_engine_cs *ring; ring = i915_gem_request_get_ring(req); /* Add a reference if we're newly entering the active list. */ if (obj->active == 0) drm_gem_object_reference(&obj->base); obj->active |= intel_ring_flag(ring); list_move_tail(&obj->ring_list[ring->id], &ring->active_list); i915_gem_request_assign(&obj->last_read_req[ring->id], req); list_move_tail(&vma->vm_link, &vma->vm->active_list); } static void i915_gem_object_retire__write(struct drm_i915_gem_object *obj) { RQ_BUG_ON(obj->last_write_req == NULL); RQ_BUG_ON(!(obj->active & intel_ring_flag(obj->last_write_req->ring))); i915_gem_request_assign(&obj->last_write_req, NULL); intel_fb_obj_flush(obj, true, ORIGIN_CS); } static void i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int ring) { struct i915_vma *vma; RQ_BUG_ON(obj->last_read_req[ring] == NULL); RQ_BUG_ON(!(obj->active & (1 << ring))); list_del_init(&obj->ring_list[ring]); i915_gem_request_assign(&obj->last_read_req[ring], NULL); if (obj->last_write_req && obj->last_write_req->ring->id == ring) i915_gem_object_retire__write(obj); obj->active &= ~(1 << ring); if (obj->active) return; /* Bump our place on the bound list to keep it roughly in LRU order * so that we don't steal from recently used but inactive objects * (unless we are forced to ofc!) */ list_move_tail(&obj->global_list, &to_i915(obj->base.dev)->mm.bound_list); list_for_each_entry(vma, &obj->vma_list, obj_link) { if (!list_empty(&vma->vm_link)) list_move_tail(&vma->vm_link, &vma->vm->inactive_list); } i915_gem_request_assign(&obj->last_fenced_req, NULL); drm_gem_object_unreference(&obj->base); } static int i915_gem_init_seqno(struct drm_device *dev, u32 seqno) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; int ret, i, j; /* Carefully retire all requests without writing to the rings */ for_each_ring(ring, dev_priv, i) { ret = intel_ring_idle(ring); if (ret) return ret; } i915_gem_retire_requests(dev); /* Finally reset hw state */ for_each_ring(ring, dev_priv, i) { intel_ring_init_seqno(ring, seqno); for (j = 0; j < ARRAY_SIZE(ring->semaphore.sync_seqno); j++) ring->semaphore.sync_seqno[j] = 0; } return 0; } int i915_gem_set_seqno(struct drm_device *dev, u32 seqno) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; if (seqno == 0) return -EINVAL; /* HWS page needs to be set less than what we * will inject to ring */ ret = i915_gem_init_seqno(dev, seqno - 1); if (ret) return ret; /* Carefully set the last_seqno value so that wrap * detection still works */ dev_priv->next_seqno = seqno; dev_priv->last_seqno = seqno - 1; if (dev_priv->last_seqno == 0) dev_priv->last_seqno--; return 0; } int i915_gem_get_seqno(struct drm_device *dev, u32 *seqno) { struct drm_i915_private *dev_priv = dev->dev_private; /* reserve 0 for non-seqno */ if (dev_priv->next_seqno == 0) { int ret = i915_gem_init_seqno(dev, 0); if (ret) return ret; dev_priv->next_seqno = 1; } *seqno = dev_priv->last_seqno = dev_priv->next_seqno++; return 0; } /* * NB: This function is not allowed to fail. Doing so would mean the the * request is not being tracked for completion but the work itself is * going to happen on the hardware. This would be a Bad Thing(tm). */ void __i915_add_request(struct drm_i915_gem_request *request, struct drm_i915_gem_object *obj, bool flush_caches) { struct intel_engine_cs *ring; struct drm_i915_private *dev_priv; struct intel_ringbuffer *ringbuf; u32 request_start; int ret; if (WARN_ON(request == NULL)) return; ring = request->ring; dev_priv = ring->dev->dev_private; ringbuf = request->ringbuf; /* * To ensure that this call will not fail, space for its emissions * should already have been reserved in the ring buffer. Let the ring * know that it is time to use that space up. */ intel_ring_reserved_space_use(ringbuf); request_start = intel_ring_get_tail(ringbuf); /* * Emit any outstanding flushes - execbuf can fail to emit the flush * after having emitted the batchbuffer command. Hence we need to fix * things up similar to emitting the lazy request. The difference here * is that the flush _must_ happen before the next request, no matter * what. */ if (flush_caches) { if (i915.enable_execlists) ret = logical_ring_flush_all_caches(request); else ret = intel_ring_flush_all_caches(request); /* Not allowed to fail! */ WARN(ret, "*_ring_flush_all_caches failed: %d!\n", ret); } /* Record the position of the start of the request so that * should we detect the updated seqno part-way through the * GPU processing the request, we never over-estimate the * position of the head. */ request->postfix = intel_ring_get_tail(ringbuf); if (i915.enable_execlists) ret = ring->emit_request(request); else { ret = ring->add_request(request); request->tail = intel_ring_get_tail(ringbuf); } /* Not allowed to fail! */ WARN(ret, "emit|add_request failed: %d!\n", ret); request->head = request_start; /* Whilst this request exists, batch_obj will be on the * active_list, and so will hold the active reference. Only when this * request is retired will the the batch_obj be moved onto the * inactive_list and lose its active reference. Hence we do not need * to explicitly hold another reference here. */ request->batch_obj = obj; request->emitted_jiffies = jiffies; request->previous_seqno = ring->last_submitted_seqno; ring->last_submitted_seqno = request->seqno; list_add_tail(&request->list, &ring->request_list); trace_i915_gem_request_add(request); i915_queue_hangcheck(ring->dev); queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, round_jiffies_up_relative(HZ)); intel_mark_busy(dev_priv->dev); /* Sanity check that the reserved size was large enough. */ intel_ring_reserved_space_end(ringbuf); } static bool i915_context_is_banned(struct drm_i915_private *dev_priv, const struct intel_context *ctx) { unsigned long elapsed; elapsed = get_seconds() - ctx->hang_stats.guilty_ts; if (ctx->hang_stats.banned) return true; if (ctx->hang_stats.ban_period_seconds && elapsed <= ctx->hang_stats.ban_period_seconds) { if (!i915_gem_context_is_default(ctx)) { DRM_DEBUG("context hanging too fast, banning!\n"); return true; } else if (i915_stop_ring_allow_ban(dev_priv)) { if (i915_stop_ring_allow_warn(dev_priv)) DRM_ERROR("gpu hanging too fast, banning!\n"); return true; } } return false; } static void i915_set_reset_status(struct drm_i915_private *dev_priv, struct intel_context *ctx, const bool guilty) { struct i915_ctx_hang_stats *hs; if (WARN_ON(!ctx)) return; hs = &ctx->hang_stats; if (guilty) { hs->banned = i915_context_is_banned(dev_priv, ctx); hs->batch_active++; hs->guilty_ts = get_seconds(); } else { hs->batch_pending++; } } void i915_gem_request_free(struct kref *req_ref) { struct drm_i915_gem_request *req = container_of(req_ref, typeof(*req), ref); struct intel_context *ctx = req->ctx; if (req->file_priv) i915_gem_request_remove_from_client(req); if (ctx) { if (i915.enable_execlists && ctx != req->i915->kernel_context) intel_lr_context_unpin(ctx, req->ring); i915_gem_context_unreference(ctx); } kmem_cache_free(req->i915->requests, req); } static inline int __i915_gem_request_alloc(struct intel_engine_cs *ring, struct intel_context *ctx, struct drm_i915_gem_request **req_out) { struct drm_i915_private *dev_priv = to_i915(ring->dev); struct drm_i915_gem_request *req; int ret; if (!req_out) return -EINVAL; *req_out = NULL; req = kmem_cache_zalloc(dev_priv->requests, GFP_KERNEL); if (req == NULL) return -ENOMEM; ret = i915_gem_get_seqno(ring->dev, &req->seqno); if (ret) goto err; kref_init(&req->ref); req->i915 = dev_priv; req->ring = ring; req->ctx = ctx; i915_gem_context_reference(req->ctx); if (i915.enable_execlists) ret = intel_logical_ring_alloc_request_extras(req); else ret = intel_ring_alloc_request_extras(req); if (ret) { i915_gem_context_unreference(req->ctx); goto err; } /* * Reserve space in the ring buffer for all the commands required to * eventually emit this request. This is to guarantee that the * i915_add_request() call can't fail. Note that the reserve may need * to be redone if the request is not actually submitted straight * away, e.g. because a GPU scheduler has deferred it. */ if (i915.enable_execlists) ret = intel_logical_ring_reserve_space(req); else ret = intel_ring_reserve_space(req); if (ret) { /* * At this point, the request is fully allocated even if not * fully prepared. Thus it can be cleaned up using the proper * free code. */ i915_gem_request_cancel(req); return ret; } *req_out = req; return 0; err: kmem_cache_free(dev_priv->requests, req); return ret; } /** * i915_gem_request_alloc - allocate a request structure * * @engine: engine that we wish to issue the request on. * @ctx: context that the request will be associated with. * This can be NULL if the request is not directly related to * any specific user context, in which case this function will * choose an appropriate context to use. * * Returns a pointer to the allocated request if successful, * or an error code if not. */ struct drm_i915_gem_request * i915_gem_request_alloc(struct intel_engine_cs *engine, struct intel_context *ctx) { struct drm_i915_gem_request *req; int err; if (ctx == NULL) ctx = to_i915(engine->dev)->kernel_context; err = __i915_gem_request_alloc(engine, ctx, &req); return err ? ERR_PTR(err) : req; } void i915_gem_request_cancel(struct drm_i915_gem_request *req) { intel_ring_reserved_space_cancel(req->ringbuf); i915_gem_request_unreference(req); } struct drm_i915_gem_request * i915_gem_find_active_request(struct intel_engine_cs *ring) { struct drm_i915_gem_request *request; list_for_each_entry(request, &ring->request_list, list) { if (i915_gem_request_completed(request, false)) continue; return request; } return NULL; } static void i915_gem_reset_ring_status(struct drm_i915_private *dev_priv, struct intel_engine_cs *ring) { struct drm_i915_gem_request *request; bool ring_hung; request = i915_gem_find_active_request(ring); if (request == NULL) return; ring_hung = ring->hangcheck.score >= HANGCHECK_SCORE_RING_HUNG; i915_set_reset_status(dev_priv, request->ctx, ring_hung); list_for_each_entry_continue(request, &ring->request_list, list) i915_set_reset_status(dev_priv, request->ctx, false); } static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv, struct intel_engine_cs *ring) { struct intel_ringbuffer *buffer; while (!list_empty(&ring->active_list)) { struct drm_i915_gem_object *obj; obj = list_first_entry(&ring->active_list, struct drm_i915_gem_object, ring_list[ring->id]); i915_gem_object_retire__read(obj, ring->id); } /* * Clear the execlists queue up before freeing the requests, as those * are the ones that keep the context and ringbuffer backing objects * pinned in place. */ if (i915.enable_execlists) { spin_lock_irq(&ring->execlist_lock); /* list_splice_tail_init checks for empty lists */ list_splice_tail_init(&ring->execlist_queue, &ring->execlist_retired_req_list); spin_unlock_irq(&ring->execlist_lock); intel_execlists_retire_requests(ring); } /* * We must free the requests after all the corresponding objects have * been moved off active lists. Which is the same order as the normal * retire_requests function does. This is important if object hold * implicit references on things like e.g. ppgtt address spaces through * the request. */ while (!list_empty(&ring->request_list)) { struct drm_i915_gem_request *request; request = list_first_entry(&ring->request_list, struct drm_i915_gem_request, list); i915_gem_request_retire(request); } /* Having flushed all requests from all queues, we know that all * ringbuffers must now be empty. However, since we do not reclaim * all space when retiring the request (to prevent HEADs colliding * with rapid ringbuffer wraparound) the amount of available space * upon reset is less than when we start. Do one more pass over * all the ringbuffers to reset last_retired_head. */ list_for_each_entry(buffer, &ring->buffers, link) { buffer->last_retired_head = buffer->tail; intel_ring_update_space(buffer); } } void i915_gem_reset(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; int i; /* * Before we free the objects from the requests, we need to inspect * them for finding the guilty party. As the requests only borrow * their reference to the objects, the inspection must be done first. */ for_each_ring(ring, dev_priv, i) i915_gem_reset_ring_status(dev_priv, ring); for_each_ring(ring, dev_priv, i) i915_gem_reset_ring_cleanup(dev_priv, ring); i915_gem_context_reset(dev); i915_gem_restore_fences(dev); WARN_ON(i915_verify_lists(dev)); } /** * This function clears the request list as sequence numbers are passed. */ void i915_gem_retire_requests_ring(struct intel_engine_cs *ring) { WARN_ON(i915_verify_lists(ring->dev)); /* Retire requests first as we use it above for the early return. * If we retire requests last, we may use a later seqno and so clear * the requests lists without clearing the active list, leading to * confusion. */ while (!list_empty(&ring->request_list)) { struct drm_i915_gem_request *request; request = list_first_entry(&ring->request_list, struct drm_i915_gem_request, list); if (!i915_gem_request_completed(request, true)) break; i915_gem_request_retire(request); } /* Move any buffers on the active list that are no longer referenced * by the ringbuffer to the flushing/inactive lists as appropriate, * before we free the context associated with the requests. */ while (!list_empty(&ring->active_list)) { struct drm_i915_gem_object *obj; obj = list_first_entry(&ring->active_list, struct drm_i915_gem_object, ring_list[ring->id]); if (!list_empty(&obj->last_read_req[ring->id]->list)) break; i915_gem_object_retire__read(obj, ring->id); } if (unlikely(ring->trace_irq_req && i915_gem_request_completed(ring->trace_irq_req, true))) { ring->irq_put(ring); i915_gem_request_assign(&ring->trace_irq_req, NULL); } WARN_ON(i915_verify_lists(ring->dev)); } bool i915_gem_retire_requests(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; bool idle = true; int i; for_each_ring(ring, dev_priv, i) { i915_gem_retire_requests_ring(ring); idle &= list_empty(&ring->request_list); if (i915.enable_execlists) { spin_lock_irq(&ring->execlist_lock); idle &= list_empty(&ring->execlist_queue); spin_unlock_irq(&ring->execlist_lock); intel_execlists_retire_requests(ring); } } if (idle) mod_delayed_work(dev_priv->wq, &dev_priv->mm.idle_work, msecs_to_jiffies(100)); return idle; } static void i915_gem_retire_work_handler(struct work_struct *work) { struct drm_i915_private *dev_priv = container_of(work, typeof(*dev_priv), mm.retire_work.work); struct drm_device *dev = dev_priv->dev; bool idle; /* Come back later if the device is busy... */ idle = false; if (mutex_trylock(&dev->struct_mutex)) { idle = i915_gem_retire_requests(dev); mutex_unlock(&dev->struct_mutex); } if (!idle) queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, round_jiffies_up_relative(HZ)); } static void i915_gem_idle_work_handler(struct work_struct *work) { struct drm_i915_private *dev_priv = container_of(work, typeof(*dev_priv), mm.idle_work.work); struct drm_device *dev = dev_priv->dev; struct intel_engine_cs *ring; int i; for_each_ring(ring, dev_priv, i) if (!list_empty(&ring->request_list)) return; /* we probably should sync with hangcheck here, using cancel_work_sync. * Also locking seems to be fubar here, ring->request_list is protected * by dev->struct_mutex. */ intel_mark_idle(dev); if (mutex_trylock(&dev->struct_mutex)) { struct intel_engine_cs *ring; int i; for_each_ring(ring, dev_priv, i) i915_gem_batch_pool_fini(&ring->batch_pool); mutex_unlock(&dev->struct_mutex); } } /** * Ensures that an object will eventually get non-busy by flushing any required * write domains, emitting any outstanding lazy request and retiring and * completed requests. */ static int i915_gem_object_flush_active(struct drm_i915_gem_object *obj) { int i; if (!obj->active) return 0; for (i = 0; i < I915_NUM_RINGS; i++) { struct drm_i915_gem_request *req; req = obj->last_read_req[i]; if (req == NULL) continue; if (list_empty(&req->list)) goto retire; if (i915_gem_request_completed(req, true)) { __i915_gem_request_retire__upto(req); retire: i915_gem_object_retire__read(obj, i); } } return 0; } /** * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT * @DRM_IOCTL_ARGS: standard ioctl arguments * * Returns 0 if successful, else an error is returned with the remaining time in * the timeout parameter. * -ETIME: object is still busy after timeout * -ERESTARTSYS: signal interrupted the wait * -ENONENT: object doesn't exist * Also possible, but rare: * -EAGAIN: GPU wedged * -ENOMEM: damn * -ENODEV: Internal IRQ fail * -E?: The add request failed * * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any * non-zero timeout parameter the wait ioctl will wait for the given number of * nanoseconds on an object becoming unbusy. Since the wait itself does so * without holding struct_mutex the object may become re-busied before this * function completes. A similar but shorter * race condition exists in the busy * ioctl */ int i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_wait *args = data; struct drm_i915_gem_object *obj; struct drm_i915_gem_request *req[I915_NUM_RINGS]; unsigned reset_counter; int i, n = 0; int ret; if (args->flags != 0) return -EINVAL; ret = i915_mutex_lock_interruptible(dev); if (ret) return ret; obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->bo_handle)); if (&obj->base == NULL) { mutex_unlock(&dev->struct_mutex); return -ENOENT; } /* Need to make sure the object gets inactive eventually. */ ret = i915_gem_object_flush_active(obj); if (ret) goto out; if (!obj->active) goto out; /* Do this after OLR check to make sure we make forward progress polling * on this IOCTL with a timeout == 0 (like busy ioctl) */ if (args->timeout_ns == 0) { ret = -ETIME; goto out; } drm_gem_object_unreference(&obj->base); reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter); for (i = 0; i < I915_NUM_RINGS; i++) { if (obj->last_read_req[i] == NULL) continue; req[n++] = i915_gem_request_reference(obj->last_read_req[i]); } mutex_unlock(&dev->struct_mutex); for (i = 0; i < n; i++) { if (ret == 0) ret = __i915_wait_request(req[i], reset_counter, true, args->timeout_ns > 0 ? &args->timeout_ns : NULL, to_rps_client(file)); i915_gem_request_unreference__unlocked(req[i]); } return ret; out: drm_gem_object_unreference(&obj->base); mutex_unlock(&dev->struct_mutex); return ret; } static int __i915_gem_object_sync(struct drm_i915_gem_object *obj, struct intel_engine_cs *to, struct drm_i915_gem_request *from_req, struct drm_i915_gem_request **to_req) { struct intel_engine_cs *from; int ret; from = i915_gem_request_get_ring(from_req); if (to == from) return 0; if (i915_gem_request_completed(from_req, true)) return 0; if (!i915_semaphore_is_enabled(obj->base.dev)) { struct drm_i915_private *i915 = to_i915(obj->base.dev); ret = __i915_wait_request(from_req, atomic_read(&i915->gpu_error.reset_counter), i915->mm.interruptible, NULL, &i915->rps.semaphores); if (ret) return ret; i915_gem_object_retire_request(obj, from_req); } else { int idx = intel_ring_sync_index(from, to); u32 seqno = i915_gem_request_get_seqno(from_req); WARN_ON(!to_req); if (seqno <= from->semaphore.sync_seqno[idx]) return 0; if (*to_req == NULL) { struct drm_i915_gem_request *req; req = i915_gem_request_alloc(to, NULL); if (IS_ERR(req)) return PTR_ERR(req); *to_req = req; } trace_i915_gem_ring_sync_to(*to_req, from, from_req); ret = to->semaphore.sync_to(*to_req, from, seqno); if (ret) return ret; /* We use last_read_req because sync_to() * might have just caused seqno wrap under * the radar. */ from->semaphore.sync_seqno[idx] = i915_gem_request_get_seqno(obj->last_read_req[from->id]); } return 0; } /** * i915_gem_object_sync - sync an object to a ring. * * @obj: object which may be in use on another ring. * @to: ring we wish to use the object on. May be NULL. * @to_req: request we wish to use the object for. See below. * This will be allocated and returned if a request is * required but not passed in. * * This code is meant to abstract object synchronization with the GPU. * Calling with NULL implies synchronizing the object with the CPU * rather than a particular GPU ring. Conceptually we serialise writes * between engines inside the GPU. We only allow one engine to write * into a buffer at any time, but multiple readers. To ensure each has * a coherent view of memory, we must: * * - If there is an outstanding write request to the object, the new * request must wait for it to complete (either CPU or in hw, requests * on the same ring will be naturally ordered). * * - If we are a write request (pending_write_domain is set), the new * request must wait for outstanding read requests to complete. * * For CPU synchronisation (NULL to) no request is required. For syncing with * rings to_req must be non-NULL. However, a request does not have to be * pre-allocated. If *to_req is NULL and sync commands will be emitted then a * request will be allocated automatically and returned through *to_req. Note * that it is not guaranteed that commands will be emitted (because the system * might already be idle). Hence there is no need to create a request that * might never have any work submitted. Note further that if a request is * returned in *to_req, it is the responsibility of the caller to submit * that request (after potentially adding more work to it). * * Returns 0 if successful, else propagates up the lower layer error. */ int i915_gem_object_sync(struct drm_i915_gem_object *obj, struct intel_engine_cs *to, struct drm_i915_gem_request **to_req) { const bool readonly = obj->base.pending_write_domain == 0; struct drm_i915_gem_request *req[I915_NUM_RINGS]; int ret, i, n; if (!obj->active) return 0; if (to == NULL) return i915_gem_object_wait_rendering(obj, readonly); n = 0; if (readonly) { if (obj->last_write_req) req[n++] = obj->last_write_req; } else { for (i = 0; i < I915_NUM_RINGS; i++) if (obj->last_read_req[i]) req[n++] = obj->last_read_req[i]; } for (i = 0; i < n; i++) { ret = __i915_gem_object_sync(obj, to, req[i], to_req); if (ret) return ret; } return 0; } static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj) { u32 old_write_domain, old_read_domains; /* Force a pagefault for domain tracking on next user access */ i915_gem_release_mmap(obj); if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0) return; /* Wait for any direct GTT access to complete */ mb(); old_read_domains = obj->base.read_domains; old_write_domain = obj->base.write_domain; obj->base.read_domains &= ~I915_GEM_DOMAIN_GTT; obj->base.write_domain &= ~I915_GEM_DOMAIN_GTT; trace_i915_gem_object_change_domain(obj, old_read_domains, old_write_domain); } static int __i915_vma_unbind(struct i915_vma *vma, bool wait) { struct drm_i915_gem_object *obj = vma->obj; struct drm_i915_private *dev_priv = obj->base.dev->dev_private; int ret; if (list_empty(&vma->obj_link)) return 0; if (!drm_mm_node_allocated(&vma->node)) { i915_gem_vma_destroy(vma); return 0; } if (vma->pin_count) return -EBUSY; BUG_ON(obj->pages == NULL); if (wait) { ret = i915_gem_object_wait_rendering(obj, false); if (ret) return ret; } if (vma->is_ggtt && vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) { i915_gem_object_finish_gtt(obj); /* release the fence reg _after_ flushing */ ret = i915_gem_object_put_fence(obj); if (ret) return ret; } trace_i915_vma_unbind(vma); vma->vm->unbind_vma(vma); vma->bound = 0; list_del_init(&vma->vm_link); if (vma->is_ggtt) { if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) { obj->map_and_fenceable = false; } else if (vma->ggtt_view.pages) { sg_free_table(vma->ggtt_view.pages); kfree(vma->ggtt_view.pages); } vma->ggtt_view.pages = NULL; } drm_mm_remove_node(&vma->node); i915_gem_vma_destroy(vma); /* Since the unbound list is global, only move to that list if * no more VMAs exist. */ if (list_empty(&obj->vma_list)) list_move_tail(&obj->global_list, &dev_priv->mm.unbound_list); /* And finally now the object is completely decoupled from this vma, * we can drop its hold on the backing storage and allow it to be * reaped by the shrinker. */ i915_gem_object_unpin_pages(obj); return 0; } int i915_vma_unbind(struct i915_vma *vma) { return __i915_vma_unbind(vma, true); } int __i915_vma_unbind_no_wait(struct i915_vma *vma) { return __i915_vma_unbind(vma, false); } int i915_gpu_idle(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; int ret, i; /* Flush everything onto the inactive list. */ for_each_ring(ring, dev_priv, i) { if (!i915.enable_execlists) { struct drm_i915_gem_request *req; req = i915_gem_request_alloc(ring, NULL); if (IS_ERR(req)) return PTR_ERR(req); ret = i915_switch_context(req); if (ret) { i915_gem_request_cancel(req); return ret; } i915_add_request_no_flush(req); } ret = intel_ring_idle(ring); if (ret) return ret; } WARN_ON(i915_verify_lists(dev)); return 0; } static bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level) { struct drm_mm_node *gtt_space = &vma->node; struct drm_mm_node *other; /* * On some machines we have to be careful when putting differing types * of snoopable memory together to avoid the prefetcher crossing memory * domains and dying. During vm initialisation, we decide whether or not * these constraints apply and set the drm_mm.color_adjust * appropriately. */ if (vma->vm->mm.color_adjust == NULL) return true; if (!drm_mm_node_allocated(gtt_space)) return true; if (list_empty(>t_space->node_list)) return true; other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list); if (other->allocated && !other->hole_follows && other->color != cache_level) return false; other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list); if (other->allocated && !gtt_space->hole_follows && other->color != cache_level) return false; return true; } /** * Finds free space in the GTT aperture and binds the object or a view of it * there. */ static struct i915_vma * i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj, struct i915_address_space *vm, const struct i915_ggtt_view *ggtt_view, unsigned alignment, uint64_t flags) { struct drm_device *dev = obj->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; u32 fence_alignment, unfenced_alignment; u32 search_flag, alloc_flag; u64 start, end; u64 size, fence_size; struct i915_vma *vma; int ret; if (i915_is_ggtt(vm)) { u32 view_size; if (WARN_ON(!ggtt_view)) return ERR_PTR(-EINVAL); view_size = i915_ggtt_view_size(obj, ggtt_view); fence_size = i915_gem_get_gtt_size(dev, view_size, obj->tiling_mode); fence_alignment = i915_gem_get_gtt_alignment(dev, view_size, obj->tiling_mode, true); unfenced_alignment = i915_gem_get_gtt_alignment(dev, view_size, obj->tiling_mode, false); size = flags & PIN_MAPPABLE ? fence_size : view_size; } else { fence_size = i915_gem_get_gtt_size(dev, obj->base.size, obj->tiling_mode); fence_alignment = i915_gem_get_gtt_alignment(dev, obj->base.size, obj->tiling_mode, true); unfenced_alignment = i915_gem_get_gtt_alignment(dev, obj->base.size, obj->tiling_mode, false); size = flags & PIN_MAPPABLE ? fence_size : obj->base.size; } start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0; end = vm->total; if (flags & PIN_MAPPABLE) end = min_t(u64, end, dev_priv->gtt.mappable_end); if (flags & PIN_ZONE_4G) end = min_t(u64, end, (1ULL << 32) - PAGE_SIZE); if (alignment == 0) alignment = flags & PIN_MAPPABLE ? fence_alignment : unfenced_alignment; if (flags & PIN_MAPPABLE && alignment & (fence_alignment - 1)) { DRM_DEBUG("Invalid object (view type=%u) alignment requested %u\n", ggtt_view ? ggtt_view->type : 0, alignment); return ERR_PTR(-EINVAL); } /* If binding the object/GGTT view requires more space than the entire * aperture has, reject it early before evicting everything in a vain * attempt to find space. */ if (size > end) { DRM_DEBUG("Attempting to bind an object (view type=%u) larger than the aperture: size=%llu > %s aperture=%llu\n", ggtt_view ? ggtt_view->type : 0, size, flags & PIN_MAPPABLE ? "mappable" : "total", end); return ERR_PTR(-E2BIG); } ret = i915_gem_object_get_pages(obj); if (ret) return ERR_PTR(ret); i915_gem_object_pin_pages(obj); vma = ggtt_view ? i915_gem_obj_lookup_or_create_ggtt_vma(obj, ggtt_view) : i915_gem_obj_lookup_or_create_vma(obj, vm); if (IS_ERR(vma)) goto err_unpin; if (flags & PIN_OFFSET_FIXED) { uint64_t offset = flags & PIN_OFFSET_MASK; if (offset & (alignment - 1) || offset + size > end) { ret = -EINVAL; goto err_free_vma; } vma->node.start = offset; vma->node.size = size; vma->node.color = obj->cache_level; ret = drm_mm_reserve_node(&vm->mm, &vma->node); if (ret) { ret = i915_gem_evict_for_vma(vma); if (ret == 0) ret = drm_mm_reserve_node(&vm->mm, &vma->node); } if (ret) goto err_free_vma; } else { if (flags & PIN_HIGH) { search_flag = DRM_MM_SEARCH_BELOW; alloc_flag = DRM_MM_CREATE_TOP; } else { search_flag = DRM_MM_SEARCH_DEFAULT; alloc_flag = DRM_MM_CREATE_DEFAULT; } search_free: ret = drm_mm_insert_node_in_range_generic(&vm->mm, &vma->node, size, alignment, obj->cache_level, start, end, search_flag, alloc_flag); if (ret) { ret = i915_gem_evict_something(dev, vm, size, alignment, obj->cache_level, start, end, flags); if (ret == 0) goto search_free; goto err_free_vma; } } if (WARN_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level))) { ret = -EINVAL; goto err_remove_node; } trace_i915_vma_bind(vma, flags); ret = i915_vma_bind(vma, obj->cache_level, flags); if (ret) goto err_remove_node; list_move_tail(&obj->global_list, &dev_priv->mm.bound_list); list_add_tail(&vma->vm_link, &vm->inactive_list); return vma; err_remove_node: drm_mm_remove_node(&vma->node); err_free_vma: i915_gem_vma_destroy(vma); vma = ERR_PTR(ret); err_unpin: i915_gem_object_unpin_pages(obj); return vma; } bool i915_gem_clflush_object(struct drm_i915_gem_object *obj, bool force) { /* If we don't have a page list set up, then we're not pinned * to GPU, and we can ignore the cache flush because it'll happen * again at bind time. */ if (obj->pages == NULL) return false; /* * Stolen memory is always coherent with the GPU as it is explicitly * marked as wc by the system, or the system is cache-coherent. */ if (obj->stolen || obj->phys_handle) return false; /* If the GPU is snooping the contents of the CPU cache, * we do not need to manually clear the CPU cache lines. However, * the caches are only snooped when the render cache is * flushed/invalidated. As we always have to emit invalidations * and flushes when moving into and out of the RENDER domain, correct * snooping behaviour occurs naturally as the result of our domain * tracking. */ if (!force && cpu_cache_is_coherent(obj->base.dev, obj->cache_level)) { obj->cache_dirty = true; return false; } trace_i915_gem_object_clflush(obj); drm_clflush_sg(obj->pages); obj->cache_dirty = false; return true; } /** Flushes the GTT write domain for the object if it's dirty. */ static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj) { uint32_t old_write_domain; if (obj->base.write_domain != I915_GEM_DOMAIN_GTT) return; /* No actual flushing is required for the GTT write domain. Writes * to it immediately go to main memory as far as we know, so there's * no chipset flush. It also doesn't land in render cache. * * However, we do have to enforce the order so that all writes through * the GTT land before any writes to the device, such as updates to * the GATT itself. */ wmb(); old_write_domain = obj->base.write_domain; obj->base.write_domain = 0; intel_fb_obj_flush(obj, false, ORIGIN_GTT); trace_i915_gem_object_change_domain(obj, obj->base.read_domains, old_write_domain); } /** Flushes the CPU write domain for the object if it's dirty. */ static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj) { uint32_t old_write_domain; if (obj->base.write_domain != I915_GEM_DOMAIN_CPU) return; if (i915_gem_clflush_object(obj, obj->pin_display)) i915_gem_chipset_flush(obj->base.dev); old_write_domain = obj->base.write_domain; obj->base.write_domain = 0; intel_fb_obj_flush(obj, false, ORIGIN_CPU); trace_i915_gem_object_change_domain(obj, obj->base.read_domains, old_write_domain); } /** * Moves a single object to the GTT read, and possibly write domain. * * This function returns when the move is complete, including waiting on * flushes to occur. */ int i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write) { uint32_t old_write_domain, old_read_domains; struct i915_vma *vma; int ret; if (obj->base.write_domain == I915_GEM_DOMAIN_GTT) return 0; ret = i915_gem_object_wait_rendering(obj, !write); if (ret) return ret; /* Flush and acquire obj->pages so that we are coherent through * direct access in memory with previous cached writes through * shmemfs and that our cache domain tracking remains valid. * For example, if the obj->filp was moved to swap without us * being notified and releasing the pages, we would mistakenly * continue to assume that the obj remained out of the CPU cached * domain. */ ret = i915_gem_object_get_pages(obj); if (ret) return ret; i915_gem_object_flush_cpu_write_domain(obj); /* Serialise direct access to this object with the barriers for * coherent writes from the GPU, by effectively invalidating the * GTT domain upon first access. */ if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0) mb(); old_write_domain = obj->base.write_domain; old_read_domains = obj->base.read_domains; /* It should now be out of any other write domains, and we can update * the domain values for our changes. */ BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0); obj->base.read_domains |= I915_GEM_DOMAIN_GTT; if (write) { obj->base.read_domains = I915_GEM_DOMAIN_GTT; obj->base.write_domain = I915_GEM_DOMAIN_GTT; obj->dirty = 1; } trace_i915_gem_object_change_domain(obj, old_read_domains, old_write_domain); /* And bump the LRU for this access */ vma = i915_gem_obj_to_ggtt(obj); if (vma && drm_mm_node_allocated(&vma->node) && !obj->active) list_move_tail(&vma->vm_link, &to_i915(obj->base.dev)->gtt.base.inactive_list); return 0; } /** * Changes the cache-level of an object across all VMA. * * After this function returns, the object will be in the new cache-level * across all GTT and the contents of the backing storage will be coherent, * with respect to the new cache-level. In order to keep the backing storage * coherent for all users, we only allow a single cache level to be set * globally on the object and prevent it from being changed whilst the * hardware is reading from the object. That is if the object is currently * on the scanout it will be set to uncached (or equivalent display * cache coherency) and all non-MOCS GPU access will also be uncached so * that all direct access to the scanout remains coherent. */ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj, enum i915_cache_level cache_level) { struct drm_device *dev = obj->base.dev; struct i915_vma *vma, *next; bool bound = false; int ret = 0; if (obj->cache_level == cache_level) goto out; /* Inspect the list of currently bound VMA and unbind any that would * be invalid given the new cache-level. This is principally to * catch the issue of the CS prefetch crossing page boundaries and * reading an invalid PTE on older architectures. */ list_for_each_entry_safe(vma, next, &obj->vma_list, obj_link) { if (!drm_mm_node_allocated(&vma->node)) continue; if (vma->pin_count) { DRM_DEBUG("can not change the cache level of pinned objects\n"); return -EBUSY; } if (!i915_gem_valid_gtt_space(vma, cache_level)) { ret = i915_vma_unbind(vma); if (ret) return ret; } else bound = true; } /* We can reuse the existing drm_mm nodes but need to change the * cache-level on the PTE. We could simply unbind them all and * rebind with the correct cache-level on next use. However since * we already have a valid slot, dma mapping, pages etc, we may as * rewrite the PTE in the belief that doing so tramples upon less * state and so involves less work. */ if (bound) { /* Before we change the PTE, the GPU must not be accessing it. * If we wait upon the object, we know that all the bound * VMA are no longer active. */ ret = i915_gem_object_wait_rendering(obj, false); if (ret) return ret; if (!HAS_LLC(dev) && cache_level != I915_CACHE_NONE) { /* Access to snoopable pages through the GTT is * incoherent and on some machines causes a hard * lockup. Relinquish the CPU mmaping to force * userspace to refault in the pages and we can * then double check if the GTT mapping is still * valid for that pointer access. */ i915_gem_release_mmap(obj); /* As we no longer need a fence for GTT access, * we can relinquish it now (and so prevent having * to steal a fence from someone else on the next * fence request). Note GPU activity would have * dropped the fence as all snoopable access is * supposed to be linear. */ ret = i915_gem_object_put_fence(obj); if (ret) return ret; } else { /* We either have incoherent backing store and * so no GTT access or the architecture is fully * coherent. In such cases, existing GTT mmaps * ignore the cache bit in the PTE and we can * rewrite it without confusing the GPU or having * to force userspace to fault back in its mmaps. */ } list_for_each_entry(vma, &obj->vma_list, obj_link) { if (!drm_mm_node_allocated(&vma->node)) continue; ret = i915_vma_bind(vma, cache_level, PIN_UPDATE); if (ret) return ret; } } list_for_each_entry(vma, &obj->vma_list, obj_link) vma->node.color = cache_level; obj->cache_level = cache_level; out: /* Flush the dirty CPU caches to the backing storage so that the * object is now coherent at its new cache level (with respect * to the access domain). */ if (obj->cache_dirty && obj->base.write_domain != I915_GEM_DOMAIN_CPU && cpu_write_needs_clflush(obj)) { if (i915_gem_clflush_object(obj, true)) i915_gem_chipset_flush(obj->base.dev); } return 0; } int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_caching *args = data; struct drm_i915_gem_object *obj; obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); if (&obj->base == NULL) return -ENOENT; switch (obj->cache_level) { case I915_CACHE_LLC: case I915_CACHE_L3_LLC: args->caching = I915_CACHING_CACHED; break; case I915_CACHE_WT: args->caching = I915_CACHING_DISPLAY; break; default: args->caching = I915_CACHING_NONE; break; } drm_gem_object_unreference_unlocked(&obj->base); return 0; } int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_caching *args = data; struct drm_i915_gem_object *obj; enum i915_cache_level level; int ret; switch (args->caching) { case I915_CACHING_NONE: level = I915_CACHE_NONE; break; case I915_CACHING_CACHED: /* * Due to a HW issue on BXT A stepping, GPU stores via a * snooped mapping may leave stale data in a corresponding CPU * cacheline, whereas normally such cachelines would get * invalidated. */ if (!HAS_LLC(dev) && !HAS_SNOOP(dev)) return -ENODEV; level = I915_CACHE_LLC; break; case I915_CACHING_DISPLAY: level = HAS_WT(dev) ? I915_CACHE_WT : I915_CACHE_NONE; break; default: return -EINVAL; } intel_runtime_pm_get(dev_priv); ret = i915_mutex_lock_interruptible(dev); if (ret) goto rpm_put; obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); if (&obj->base == NULL) { ret = -ENOENT; goto unlock; } ret = i915_gem_object_set_cache_level(obj, level); drm_gem_object_unreference(&obj->base); unlock: mutex_unlock(&dev->struct_mutex); rpm_put: intel_runtime_pm_put(dev_priv); return ret; } /* * Prepare buffer for display plane (scanout, cursors, etc). * Can be called from an uninterruptible phase (modesetting) and allows * any flushes to be pipelined (for pageflips). */ int i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj, u32 alignment, const struct i915_ggtt_view *view) { u32 old_read_domains, old_write_domain; int ret; /* Mark the pin_display early so that we account for the * display coherency whilst setting up the cache domains. */ obj->pin_display++; /* The display engine is not coherent with the LLC cache on gen6. As * a result, we make sure that the pinning that is about to occur is * done with uncached PTEs. This is lowest common denominator for all * chipsets. * * However for gen6+, we could do better by using the GFDT bit instead * of uncaching, which would allow us to flush all the LLC-cached data * with that bit in the PTE to main memory with just one PIPE_CONTROL. */ ret = i915_gem_object_set_cache_level(obj, HAS_WT(obj->base.dev) ? I915_CACHE_WT : I915_CACHE_NONE); if (ret) goto err_unpin_display; /* As the user may map the buffer once pinned in the display plane * (e.g. libkms for the bootup splash), we have to ensure that we * always use map_and_fenceable for all scanout buffers. */ ret = i915_gem_object_ggtt_pin(obj, view, alignment, view->type == I915_GGTT_VIEW_NORMAL ? PIN_MAPPABLE : 0); if (ret) goto err_unpin_display; i915_gem_object_flush_cpu_write_domain(obj); old_write_domain = obj->base.write_domain; old_read_domains = obj->base.read_domains; /* It should now be out of any other write domains, and we can update * the domain values for our changes. */ obj->base.write_domain = 0; obj->base.read_domains |= I915_GEM_DOMAIN_GTT; trace_i915_gem_object_change_domain(obj, old_read_domains, old_write_domain); return 0; err_unpin_display: obj->pin_display--; return ret; } void i915_gem_object_unpin_from_display_plane(struct drm_i915_gem_object *obj, const struct i915_ggtt_view *view) { if (WARN_ON(obj->pin_display == 0)) return; i915_gem_object_ggtt_unpin_view(obj, view); obj->pin_display--; } /** * Moves a single object to the CPU read, and possibly write domain. * * This function returns when the move is complete, including waiting on * flushes to occur. */ int i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write) { uint32_t old_write_domain, old_read_domains; int ret; if (obj->base.write_domain == I915_GEM_DOMAIN_CPU) return 0; ret = i915_gem_object_wait_rendering(obj, !write); if (ret) return ret; i915_gem_object_flush_gtt_write_domain(obj); old_write_domain = obj->base.write_domain; old_read_domains = obj->base.read_domains; /* Flush the CPU cache if it's still invalid. */ if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) { i915_gem_clflush_object(obj, false); obj->base.read_domains |= I915_GEM_DOMAIN_CPU; } /* It should now be out of any other write domains, and we can update * the domain values for our changes. */ BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0); /* If we're writing through the CPU, then the GPU read domains will * need to be invalidated at next use. */ if (write) { obj->base.read_domains = I915_GEM_DOMAIN_CPU; obj->base.write_domain = I915_GEM_DOMAIN_CPU; } trace_i915_gem_object_change_domain(obj, old_read_domains, old_write_domain); return 0; } /* Throttle our rendering by waiting until the ring has completed our requests * emitted over 20 msec ago. * * Note that if we were to use the current jiffies each time around the loop, * we wouldn't escape the function with any frames outstanding if the time to * render a frame was over 20ms. * * This should get us reasonable parallelism between CPU and GPU but also * relatively low latency when blocking on a particular request to finish. */ static int i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_file_private *file_priv = file->driver_priv; unsigned long recent_enough = jiffies - DRM_I915_THROTTLE_JIFFIES; struct drm_i915_gem_request *request, *target = NULL; unsigned reset_counter; int ret; ret = i915_gem_wait_for_error(&dev_priv->gpu_error); if (ret) return ret; ret = i915_gem_check_wedge(&dev_priv->gpu_error, false); if (ret) return ret; spin_lock(&file_priv->mm.lock); list_for_each_entry(request, &file_priv->mm.request_list, client_list) { if (time_after_eq(request->emitted_jiffies, recent_enough)) break; /* * Note that the request might not have been submitted yet. * In which case emitted_jiffies will be zero. */ if (!request->emitted_jiffies) continue; target = request; } reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter); if (target) i915_gem_request_reference(target); spin_unlock(&file_priv->mm.lock); if (target == NULL) return 0; ret = __i915_wait_request(target, reset_counter, true, NULL, NULL); if (ret == 0) queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0); i915_gem_request_unreference__unlocked(target); return ret; } static bool i915_vma_misplaced(struct i915_vma *vma, uint32_t alignment, uint64_t flags) { struct drm_i915_gem_object *obj = vma->obj; if (alignment && vma->node.start & (alignment - 1)) return true; if (flags & PIN_MAPPABLE && !obj->map_and_fenceable) return true; if (flags & PIN_OFFSET_BIAS && vma->node.start < (flags & PIN_OFFSET_MASK)) return true; if (flags & PIN_OFFSET_FIXED && vma->node.start != (flags & PIN_OFFSET_MASK)) return true; return false; } void __i915_vma_set_map_and_fenceable(struct i915_vma *vma) { struct drm_i915_gem_object *obj = vma->obj; bool mappable, fenceable; u32 fence_size, fence_alignment; fence_size = i915_gem_get_gtt_size(obj->base.dev, obj->base.size, obj->tiling_mode); fence_alignment = i915_gem_get_gtt_alignment(obj->base.dev, obj->base.size, obj->tiling_mode, true); fenceable = (vma->node.size == fence_size && (vma->node.start & (fence_alignment - 1)) == 0); mappable = (vma->node.start + fence_size <= to_i915(obj->base.dev)->gtt.mappable_end); obj->map_and_fenceable = mappable && fenceable; } static int i915_gem_object_do_pin(struct drm_i915_gem_object *obj, struct i915_address_space *vm, const struct i915_ggtt_view *ggtt_view, uint32_t alignment, uint64_t flags) { struct drm_i915_private *dev_priv = obj->base.dev->dev_private; struct i915_vma *vma; unsigned bound; int ret; if (WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base)) return -ENODEV; if (WARN_ON(flags & (PIN_GLOBAL | PIN_MAPPABLE) && !i915_is_ggtt(vm))) return -EINVAL; if (WARN_ON((flags & (PIN_MAPPABLE | PIN_GLOBAL)) == PIN_MAPPABLE)) return -EINVAL; if (WARN_ON(i915_is_ggtt(vm) != !!ggtt_view)) return -EINVAL; vma = ggtt_view ? i915_gem_obj_to_ggtt_view(obj, ggtt_view) : i915_gem_obj_to_vma(obj, vm); if (IS_ERR(vma)) return PTR_ERR(vma); if (vma) { if (WARN_ON(vma->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT)) return -EBUSY; if (i915_vma_misplaced(vma, alignment, flags)) { WARN(vma->pin_count, "bo is already pinned in %s with incorrect alignment:" " offset=%08x %08x, req.alignment=%x, req.map_and_fenceable=%d," " obj->map_and_fenceable=%d\n", ggtt_view ? "ggtt" : "ppgtt", upper_32_bits(vma->node.start), lower_32_bits(vma->node.start), alignment, !!(flags & PIN_MAPPABLE), obj->map_and_fenceable); ret = i915_vma_unbind(vma); if (ret) return ret; vma = NULL; } } bound = vma ? vma->bound : 0; if (vma == NULL || !drm_mm_node_allocated(&vma->node)) { vma = i915_gem_object_bind_to_vm(obj, vm, ggtt_view, alignment, flags); if (IS_ERR(vma)) return PTR_ERR(vma); } else { ret = i915_vma_bind(vma, obj->cache_level, flags); if (ret) return ret; } if (ggtt_view && ggtt_view->type == I915_GGTT_VIEW_NORMAL && (bound ^ vma->bound) & GLOBAL_BIND) { __i915_vma_set_map_and_fenceable(vma); WARN_ON(flags & PIN_MAPPABLE && !obj->map_and_fenceable); } vma->pin_count++; return 0; } int i915_gem_object_pin(struct drm_i915_gem_object *obj, struct i915_address_space *vm, uint32_t alignment, uint64_t flags) { return i915_gem_object_do_pin(obj, vm, i915_is_ggtt(vm) ? &i915_ggtt_view_normal : NULL, alignment, flags); } int i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj, const struct i915_ggtt_view *view, uint32_t alignment, uint64_t flags) { if (WARN_ONCE(!view, "no view specified")) return -EINVAL; return i915_gem_object_do_pin(obj, i915_obj_to_ggtt(obj), view, alignment, flags | PIN_GLOBAL); } void i915_gem_object_ggtt_unpin_view(struct drm_i915_gem_object *obj, const struct i915_ggtt_view *view) { struct i915_vma *vma = i915_gem_obj_to_ggtt_view(obj, view); BUG_ON(!vma); WARN_ON(vma->pin_count == 0); WARN_ON(!i915_gem_obj_ggtt_bound_view(obj, view)); --vma->pin_count; } int i915_gem_busy_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_busy *args = data; struct drm_i915_gem_object *obj; int ret; ret = i915_mutex_lock_interruptible(dev); if (ret) return ret; obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); if (&obj->base == NULL) { ret = -ENOENT; goto unlock; } /* Count all active objects as busy, even if they are currently not used * by the gpu. Users of this interface expect objects to eventually * become non-busy without any further actions, therefore emit any * necessary flushes here. */ ret = i915_gem_object_flush_active(obj); if (ret) goto unref; args->busy = 0; if (obj->active) { int i; for (i = 0; i < I915_NUM_RINGS; i++) { struct drm_i915_gem_request *req; req = obj->last_read_req[i]; if (req) args->busy |= 1 << (16 + req->ring->exec_id); } if (obj->last_write_req) args->busy |= obj->last_write_req->ring->exec_id; } unref: drm_gem_object_unreference(&obj->base); unlock: mutex_unlock(&dev->struct_mutex); return ret; } int i915_gem_throttle_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { return i915_gem_ring_throttle(dev, file_priv); } int i915_gem_madvise_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_madvise *args = data; struct drm_i915_gem_object *obj; int ret; switch (args->madv) { case I915_MADV_DONTNEED: case I915_MADV_WILLNEED: break; default: return -EINVAL; } ret = i915_mutex_lock_interruptible(dev); if (ret) return ret; obj = to_intel_bo(drm_gem_object_lookup(dev, file_priv, args->handle)); if (&obj->base == NULL) { ret = -ENOENT; goto unlock; } if (i915_gem_obj_is_pinned(obj)) { ret = -EINVAL; goto out; } if (obj->pages && obj->tiling_mode != I915_TILING_NONE && dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) { if (obj->madv == I915_MADV_WILLNEED) i915_gem_object_unpin_pages(obj); if (args->madv == I915_MADV_WILLNEED) i915_gem_object_pin_pages(obj); } if (obj->madv != __I915_MADV_PURGED) obj->madv = args->madv; /* if the object is no longer attached, discard its backing storage */ if (obj->madv == I915_MADV_DONTNEED && obj->pages == NULL) i915_gem_object_truncate(obj); args->retained = obj->madv != __I915_MADV_PURGED; out: drm_gem_object_unreference(&obj->base); unlock: mutex_unlock(&dev->struct_mutex); return ret; } void i915_gem_object_init(struct drm_i915_gem_object *obj, const struct drm_i915_gem_object_ops *ops) { int i; INIT_LIST_HEAD(&obj->global_list); for (i = 0; i < I915_NUM_RINGS; i++) INIT_LIST_HEAD(&obj->ring_list[i]); INIT_LIST_HEAD(&obj->obj_exec_link); INIT_LIST_HEAD(&obj->vma_list); INIT_LIST_HEAD(&obj->batch_pool_link); obj->ops = ops; obj->fence_reg = I915_FENCE_REG_NONE; obj->madv = I915_MADV_WILLNEED; i915_gem_info_add_obj(obj->base.dev->dev_private, obj->base.size); } static const struct drm_i915_gem_object_ops i915_gem_object_ops = { .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE, .get_pages = i915_gem_object_get_pages_gtt, .put_pages = i915_gem_object_put_pages_gtt, }; struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev, size_t size) { struct drm_i915_gem_object *obj; struct address_space *mapping; gfp_t mask; obj = i915_gem_object_alloc(dev); if (obj == NULL) return NULL; if (drm_gem_object_init(dev, &obj->base, size) != 0) { i915_gem_object_free(obj); return NULL; } mask = GFP_HIGHUSER | __GFP_RECLAIMABLE; if (IS_CRESTLINE(dev) || IS_BROADWATER(dev)) { /* 965gm cannot relocate objects above 4GiB. */ mask &= ~__GFP_HIGHMEM; mask |= __GFP_DMA32; } mapping = file_inode(obj->base.filp)->i_mapping; mapping_set_gfp_mask(mapping, mask); i915_gem_object_init(obj, &i915_gem_object_ops); obj->base.write_domain = I915_GEM_DOMAIN_CPU; obj->base.read_domains = I915_GEM_DOMAIN_CPU; if (HAS_LLC(dev)) { /* On some devices, we can have the GPU use the LLC (the CPU * cache) for about a 10% performance improvement * compared to uncached. Graphics requests other than * display scanout are coherent with the CPU in * accessing this cache. This means in this mode we * don't need to clflush on the CPU side, and on the * GPU side we only need to flush internal caches to * get data visible to the CPU. * * However, we maintain the display planes as UC, and so * need to rebind when first used as such. */ obj->cache_level = I915_CACHE_LLC; } else obj->cache_level = I915_CACHE_NONE; trace_i915_gem_object_create(obj); return obj; } static bool discard_backing_storage(struct drm_i915_gem_object *obj) { /* If we are the last user of the backing storage (be it shmemfs * pages or stolen etc), we know that the pages are going to be * immediately released. In this case, we can then skip copying * back the contents from the GPU. */ if (obj->madv != I915_MADV_WILLNEED) return false; if (obj->base.filp == NULL) return true; /* At first glance, this looks racy, but then again so would be * userspace racing mmap against close. However, the first external * reference to the filp can only be obtained through the * i915_gem_mmap_ioctl() which safeguards us against the user * acquiring such a reference whilst we are in the middle of * freeing the object. */ return atomic_long_read(&obj->base.filp->f_count) == 1; } void i915_gem_free_object(struct drm_gem_object *gem_obj) { struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); struct drm_device *dev = obj->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct i915_vma *vma, *next; intel_runtime_pm_get(dev_priv); trace_i915_gem_object_destroy(obj); list_for_each_entry_safe(vma, next, &obj->vma_list, obj_link) { int ret; vma->pin_count = 0; ret = i915_vma_unbind(vma); if (WARN_ON(ret == -ERESTARTSYS)) { bool was_interruptible; was_interruptible = dev_priv->mm.interruptible; dev_priv->mm.interruptible = false; WARN_ON(i915_vma_unbind(vma)); dev_priv->mm.interruptible = was_interruptible; } } /* Stolen objects don't hold a ref, but do hold pin count. Fix that up * before progressing. */ if (obj->stolen) i915_gem_object_unpin_pages(obj); WARN_ON(obj->frontbuffer_bits); if (obj->pages && obj->madv == I915_MADV_WILLNEED && dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES && obj->tiling_mode != I915_TILING_NONE) i915_gem_object_unpin_pages(obj); if (WARN_ON(obj->pages_pin_count)) obj->pages_pin_count = 0; if (discard_backing_storage(obj)) obj->madv = I915_MADV_DONTNEED; i915_gem_object_put_pages(obj); i915_gem_object_free_mmap_offset(obj); BUG_ON(obj->pages); if (obj->base.import_attach) drm_prime_gem_destroy(&obj->base, NULL); if (obj->ops->release) obj->ops->release(obj); drm_gem_object_release(&obj->base); i915_gem_info_remove_obj(dev_priv, obj->base.size); kfree(obj->bit_17); i915_gem_object_free(obj); intel_runtime_pm_put(dev_priv); } struct i915_vma *i915_gem_obj_to_vma(struct drm_i915_gem_object *obj, struct i915_address_space *vm) { struct i915_vma *vma; list_for_each_entry(vma, &obj->vma_list, obj_link) { if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL && vma->vm == vm) return vma; } return NULL; } struct i915_vma *i915_gem_obj_to_ggtt_view(struct drm_i915_gem_object *obj, const struct i915_ggtt_view *view) { struct i915_address_space *ggtt = i915_obj_to_ggtt(obj); struct i915_vma *vma; if (WARN_ONCE(!view, "no view specified")) return ERR_PTR(-EINVAL); list_for_each_entry(vma, &obj->vma_list, obj_link) if (vma->vm == ggtt && i915_ggtt_view_equal(&vma->ggtt_view, view)) return vma; return NULL; } void i915_gem_vma_destroy(struct i915_vma *vma) { WARN_ON(vma->node.allocated); /* Keep the vma as a placeholder in the execbuffer reservation lists */ if (!list_empty(&vma->exec_list)) return; if (!vma->is_ggtt) i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm)); list_del(&vma->obj_link); kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma); } static void i915_gem_stop_ringbuffers(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; int i; for_each_ring(ring, dev_priv, i) dev_priv->gt.stop_ring(ring); } int i915_gem_suspend(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int ret = 0; mutex_lock(&dev->struct_mutex); ret = i915_gpu_idle(dev); if (ret) goto err; i915_gem_retire_requests(dev); i915_gem_stop_ringbuffers(dev); mutex_unlock(&dev->struct_mutex); cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work); cancel_delayed_work_sync(&dev_priv->mm.retire_work); flush_delayed_work(&dev_priv->mm.idle_work); /* Assert that we sucessfully flushed all the work and * reset the GPU back to its idle, low power state. */ WARN_ON(dev_priv->mm.busy); return 0; err: mutex_unlock(&dev->struct_mutex); return ret; } int i915_gem_l3_remap(struct drm_i915_gem_request *req, int slice) { struct intel_engine_cs *ring = req->ring; struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; u32 *remap_info = dev_priv->l3_parity.remap_info[slice]; int i, ret; if (!HAS_L3_DPF(dev) || !remap_info) return 0; ret = intel_ring_begin(req, GEN7_L3LOG_SIZE / 4 * 3); if (ret) return ret; /* * Note: We do not worry about the concurrent register cacheline hang * here because no other code should access these registers other than * at initialization time. */ for (i = 0; i < GEN7_L3LOG_SIZE / 4; i++) { intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1)); intel_ring_emit_reg(ring, GEN7_L3LOG(slice, i)); intel_ring_emit(ring, remap_info[i]); } intel_ring_advance(ring); return ret; } void i915_gem_init_swizzling(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; if (INTEL_INFO(dev)->gen < 5 || dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE) return; I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) | DISP_TILE_SURFACE_SWIZZLING); if (IS_GEN5(dev)) return; I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL); if (IS_GEN6(dev)) I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB)); else if (IS_GEN7(dev)) I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB)); else if (IS_GEN8(dev)) I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW)); else BUG(); } static void init_unused_ring(struct drm_device *dev, u32 base) { struct drm_i915_private *dev_priv = dev->dev_private; I915_WRITE(RING_CTL(base), 0); I915_WRITE(RING_HEAD(base), 0); I915_WRITE(RING_TAIL(base), 0); I915_WRITE(RING_START(base), 0); } static void init_unused_rings(struct drm_device *dev) { if (IS_I830(dev)) { init_unused_ring(dev, PRB1_BASE); init_unused_ring(dev, SRB0_BASE); init_unused_ring(dev, SRB1_BASE); init_unused_ring(dev, SRB2_BASE); init_unused_ring(dev, SRB3_BASE); } else if (IS_GEN2(dev)) { init_unused_ring(dev, SRB0_BASE); init_unused_ring(dev, SRB1_BASE); } else if (IS_GEN3(dev)) { init_unused_ring(dev, PRB1_BASE); init_unused_ring(dev, PRB2_BASE); } } int i915_gem_init_rings(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; ret = intel_init_render_ring_buffer(dev); if (ret) return ret; if (HAS_BSD(dev)) { ret = intel_init_bsd_ring_buffer(dev); if (ret) goto cleanup_render_ring; } if (HAS_BLT(dev)) { ret = intel_init_blt_ring_buffer(dev); if (ret) goto cleanup_bsd_ring; } if (HAS_VEBOX(dev)) { ret = intel_init_vebox_ring_buffer(dev); if (ret) goto cleanup_blt_ring; } if (HAS_BSD2(dev)) { ret = intel_init_bsd2_ring_buffer(dev); if (ret) goto cleanup_vebox_ring; } return 0; cleanup_vebox_ring: intel_cleanup_ring_buffer(&dev_priv->ring[VECS]); cleanup_blt_ring: intel_cleanup_ring_buffer(&dev_priv->ring[BCS]); cleanup_bsd_ring: intel_cleanup_ring_buffer(&dev_priv->ring[VCS]); cleanup_render_ring: intel_cleanup_ring_buffer(&dev_priv->ring[RCS]); return ret; } int i915_gem_init_hw(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; int ret, i, j; if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt()) return -EIO; /* Double layer security blanket, see i915_gem_init() */ intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); if (dev_priv->ellc_size) I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf)); if (IS_HASWELL(dev)) I915_WRITE(MI_PREDICATE_RESULT_2, IS_HSW_GT3(dev) ? LOWER_SLICE_ENABLED : LOWER_SLICE_DISABLED); if (HAS_PCH_NOP(dev)) { if (IS_IVYBRIDGE(dev)) { u32 temp = I915_READ(GEN7_MSG_CTL); temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK); I915_WRITE(GEN7_MSG_CTL, temp); } else if (INTEL_INFO(dev)->gen >= 7) { u32 temp = I915_READ(HSW_NDE_RSTWRN_OPT); temp &= ~RESET_PCH_HANDSHAKE_ENABLE; I915_WRITE(HSW_NDE_RSTWRN_OPT, temp); } } i915_gem_init_swizzling(dev); /* * At least 830 can leave some of the unused rings * "active" (ie. head != tail) after resume which * will prevent c3 entry. Makes sure all unused rings * are totally idle. */ init_unused_rings(dev); BUG_ON(!dev_priv->kernel_context); ret = i915_ppgtt_init_hw(dev); if (ret) { DRM_ERROR("PPGTT enable HW failed %d\n", ret); goto out; } /* Need to do basic initialisation of all rings first: */ for_each_ring(ring, dev_priv, i) { ret = ring->init_hw(ring); if (ret) goto out; } /* We can't enable contexts until all firmware is loaded */ if (HAS_GUC_UCODE(dev)) { ret = intel_guc_ucode_load(dev); if (ret) { DRM_ERROR("Failed to initialize GuC, error %d\n", ret); ret = -EIO; goto out; } } /* * Increment the next seqno by 0x100 so we have a visible break * on re-initialisation */ ret = i915_gem_set_seqno(dev, dev_priv->next_seqno+0x100); if (ret) goto out; /* Now it is safe to go back round and do everything else: */ for_each_ring(ring, dev_priv, i) { struct drm_i915_gem_request *req; req = i915_gem_request_alloc(ring, NULL); if (IS_ERR(req)) { ret = PTR_ERR(req); i915_gem_cleanup_ringbuffer(dev); goto out; } if (ring->id == RCS) { for (j = 0; j < NUM_L3_SLICES(dev); j++) i915_gem_l3_remap(req, j); } ret = i915_ppgtt_init_ring(req); if (ret && ret != -EIO) { DRM_ERROR("PPGTT enable ring #%d failed %d\n", i, ret); i915_gem_request_cancel(req); i915_gem_cleanup_ringbuffer(dev); goto out; } ret = i915_gem_context_enable(req); if (ret && ret != -EIO) { DRM_ERROR("Context enable ring #%d failed %d\n", i, ret); i915_gem_request_cancel(req); i915_gem_cleanup_ringbuffer(dev); goto out; } i915_add_request_no_flush(req); } out: intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); return ret; } int i915_gem_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; i915.enable_execlists = intel_sanitize_enable_execlists(dev, i915.enable_execlists); mutex_lock(&dev->struct_mutex); if (!i915.enable_execlists) { dev_priv->gt.execbuf_submit = i915_gem_ringbuffer_submission; dev_priv->gt.init_rings = i915_gem_init_rings; dev_priv->gt.cleanup_ring = intel_cleanup_ring_buffer; dev_priv->gt.stop_ring = intel_stop_ring_buffer; } else { dev_priv->gt.execbuf_submit = intel_execlists_submission; dev_priv->gt.init_rings = intel_logical_rings_init; dev_priv->gt.cleanup_ring = intel_logical_ring_cleanup; dev_priv->gt.stop_ring = intel_logical_ring_stop; } /* This is just a security blanket to placate dragons. * On some systems, we very sporadically observe that the first TLBs * used by the CS may be stale, despite us poking the TLB reset. If * we hold the forcewake during initialisation these problems * just magically go away. */ intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); ret = i915_gem_init_userptr(dev); if (ret) goto out_unlock; i915_gem_init_global_gtt(dev); ret = i915_gem_context_init(dev); if (ret) goto out_unlock; ret = dev_priv->gt.init_rings(dev); if (ret) goto out_unlock; ret = i915_gem_init_hw(dev); if (ret == -EIO) { /* Allow ring initialisation to fail by marking the GPU as * wedged. But we only want to do this where the GPU is angry, * for all other failure, such as an allocation failure, bail. */ DRM_ERROR("Failed to initialize GPU, declaring it wedged\n"); atomic_or(I915_WEDGED, &dev_priv->gpu_error.reset_counter); ret = 0; } out_unlock: intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); mutex_unlock(&dev->struct_mutex); return ret; } void i915_gem_cleanup_ringbuffer(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; int i; for_each_ring(ring, dev_priv, i) dev_priv->gt.cleanup_ring(ring); if (i915.enable_execlists) /* * Neither the BIOS, ourselves or any other kernel * expects the system to be in execlists mode on startup, * so we need to reset the GPU back to legacy mode. */ intel_gpu_reset(dev); } static void init_ring_lists(struct intel_engine_cs *ring) { INIT_LIST_HEAD(&ring->active_list); INIT_LIST_HEAD(&ring->request_list); } void i915_gem_load_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int i; dev_priv->objects = kmem_cache_create("i915_gem_object", sizeof(struct drm_i915_gem_object), 0, SLAB_HWCACHE_ALIGN, NULL); dev_priv->vmas = kmem_cache_create("i915_gem_vma", sizeof(struct i915_vma), 0, SLAB_HWCACHE_ALIGN, NULL); dev_priv->requests = kmem_cache_create("i915_gem_request", sizeof(struct drm_i915_gem_request), 0, SLAB_HWCACHE_ALIGN, NULL); INIT_LIST_HEAD(&dev_priv->vm_list); INIT_LIST_HEAD(&dev_priv->context_list); INIT_LIST_HEAD(&dev_priv->mm.unbound_list); INIT_LIST_HEAD(&dev_priv->mm.bound_list); INIT_LIST_HEAD(&dev_priv->mm.fence_list); for (i = 0; i < I915_NUM_RINGS; i++) init_ring_lists(&dev_priv->ring[i]); for (i = 0; i < I915_MAX_NUM_FENCES; i++) INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list); INIT_DELAYED_WORK(&dev_priv->mm.retire_work, i915_gem_retire_work_handler); INIT_DELAYED_WORK(&dev_priv->mm.idle_work, i915_gem_idle_work_handler); init_waitqueue_head(&dev_priv->gpu_error.reset_queue); dev_priv->relative_constants_mode = I915_EXEC_CONSTANTS_REL_GENERAL; if (INTEL_INFO(dev)->gen >= 7 && !IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev)) dev_priv->num_fence_regs = 32; else if (INTEL_INFO(dev)->gen >= 4 || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev)) dev_priv->num_fence_regs = 16; else dev_priv->num_fence_regs = 8; if (intel_vgpu_active(dev)) dev_priv->num_fence_regs = I915_READ(vgtif_reg(avail_rs.fence_num)); /* * Set initial sequence number for requests. * Using this number allows the wraparound to happen early, * catching any obvious problems. */ dev_priv->next_seqno = ((u32)~0 - 0x1100); dev_priv->last_seqno = ((u32)~0 - 0x1101); /* Initialize fence registers to zero */ INIT_LIST_HEAD(&dev_priv->mm.fence_list); i915_gem_restore_fences(dev); i915_gem_detect_bit_6_swizzle(dev); init_waitqueue_head(&dev_priv->pending_flip_queue); dev_priv->mm.interruptible = true; mutex_init(&dev_priv->fb_tracking.lock); } void i915_gem_load_cleanup(struct drm_device *dev) { struct drm_i915_private *dev_priv = to_i915(dev); kmem_cache_destroy(dev_priv->requests); kmem_cache_destroy(dev_priv->vmas); kmem_cache_destroy(dev_priv->objects); } void i915_gem_release(struct drm_device *dev, struct drm_file *file) { struct drm_i915_file_private *file_priv = file->driver_priv; /* Clean up our request list when the client is going away, so that * later retire_requests won't dereference our soon-to-be-gone * file_priv. */ spin_lock(&file_priv->mm.lock); while (!list_empty(&file_priv->mm.request_list)) { struct drm_i915_gem_request *request; request = list_first_entry(&file_priv->mm.request_list, struct drm_i915_gem_request, client_list); list_del(&request->client_list); request->file_priv = NULL; } spin_unlock(&file_priv->mm.lock); if (!list_empty(&file_priv->rps.link)) { spin_lock(&to_i915(dev)->rps.client_lock); list_del(&file_priv->rps.link); spin_unlock(&to_i915(dev)->rps.client_lock); } } int i915_gem_open(struct drm_device *dev, struct drm_file *file) { struct drm_i915_file_private *file_priv; int ret; DRM_DEBUG_DRIVER("\n"); file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL); if (!file_priv) return -ENOMEM; file->driver_priv = file_priv; file_priv->dev_priv = dev->dev_private; file_priv->file = file; INIT_LIST_HEAD(&file_priv->rps.link); spin_lock_init(&file_priv->mm.lock); INIT_LIST_HEAD(&file_priv->mm.request_list); file_priv->bsd_ring = -1; ret = i915_gem_context_open(dev, file); if (ret) kfree(file_priv); return ret; } /** * i915_gem_track_fb - update frontbuffer tracking * @old: current GEM buffer for the frontbuffer slots * @new: new GEM buffer for the frontbuffer slots * @frontbuffer_bits: bitmask of frontbuffer slots * * This updates the frontbuffer tracking bits @frontbuffer_bits by clearing them * from @old and setting them in @new. Both @old and @new can be NULL. */ void i915_gem_track_fb(struct drm_i915_gem_object *old, struct drm_i915_gem_object *new, unsigned frontbuffer_bits) { if (old) { WARN_ON(!mutex_is_locked(&old->base.dev->struct_mutex)); WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits)); old->frontbuffer_bits &= ~frontbuffer_bits; } if (new) { WARN_ON(!mutex_is_locked(&new->base.dev->struct_mutex)); WARN_ON(new->frontbuffer_bits & frontbuffer_bits); new->frontbuffer_bits |= frontbuffer_bits; } } /* All the new VM stuff */ u64 i915_gem_obj_offset(struct drm_i915_gem_object *o, struct i915_address_space *vm) { struct drm_i915_private *dev_priv = o->base.dev->dev_private; struct i915_vma *vma; WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base); list_for_each_entry(vma, &o->vma_list, obj_link) { if (vma->is_ggtt && vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL) continue; if (vma->vm == vm) return vma->node.start; } WARN(1, "%s vma for this object not found.\n", i915_is_ggtt(vm) ? "global" : "ppgtt"); return -1; } u64 i915_gem_obj_ggtt_offset_view(struct drm_i915_gem_object *o, const struct i915_ggtt_view *view) { struct i915_address_space *ggtt = i915_obj_to_ggtt(o); struct i915_vma *vma; list_for_each_entry(vma, &o->vma_list, obj_link) if (vma->vm == ggtt && i915_ggtt_view_equal(&vma->ggtt_view, view)) return vma->node.start; WARN(1, "global vma for this object not found. (view=%u)\n", view->type); return -1; } bool i915_gem_obj_bound(struct drm_i915_gem_object *o, struct i915_address_space *vm) { struct i915_vma *vma; list_for_each_entry(vma, &o->vma_list, obj_link) { if (vma->is_ggtt && vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL) continue; if (vma->vm == vm && drm_mm_node_allocated(&vma->node)) return true; } return false; } bool i915_gem_obj_ggtt_bound_view(struct drm_i915_gem_object *o, const struct i915_ggtt_view *view) { struct i915_address_space *ggtt = i915_obj_to_ggtt(o); struct i915_vma *vma; list_for_each_entry(vma, &o->vma_list, obj_link) if (vma->vm == ggtt && i915_ggtt_view_equal(&vma->ggtt_view, view) && drm_mm_node_allocated(&vma->node)) return true; return false; } bool i915_gem_obj_bound_any(struct drm_i915_gem_object *o) { struct i915_vma *vma; list_for_each_entry(vma, &o->vma_list, obj_link) if (drm_mm_node_allocated(&vma->node)) return true; return false; } unsigned long i915_gem_obj_size(struct drm_i915_gem_object *o, struct i915_address_space *vm) { struct drm_i915_private *dev_priv = o->base.dev->dev_private; struct i915_vma *vma; WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base); BUG_ON(list_empty(&o->vma_list)); list_for_each_entry(vma, &o->vma_list, obj_link) { if (vma->is_ggtt && vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL) continue; if (vma->vm == vm) return vma->node.size; } return 0; } bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj) { struct i915_vma *vma; list_for_each_entry(vma, &obj->vma_list, obj_link) if (vma->pin_count > 0) return true; return false; } /* Like i915_gem_object_get_page(), but mark the returned page dirty */ struct page * i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, int n) { struct page *page; /* Only default objects have per-page dirty tracking */ if (WARN_ON((obj->ops->flags & I915_GEM_OBJECT_HAS_STRUCT_PAGE) == 0)) return NULL; page = i915_gem_object_get_page(obj, n); set_page_dirty(page); return page; } /* Allocate a new GEM object and fill it with the supplied data */ struct drm_i915_gem_object * i915_gem_object_create_from_data(struct drm_device *dev, const void *data, size_t size) { struct drm_i915_gem_object *obj; struct sg_table *sg; size_t bytes; int ret; obj = i915_gem_alloc_object(dev, round_up(size, PAGE_SIZE)); if (IS_ERR_OR_NULL(obj)) return obj; ret = i915_gem_object_set_to_cpu_domain(obj, true); if (ret) goto fail; ret = i915_gem_object_get_pages(obj); if (ret) goto fail; i915_gem_object_pin_pages(obj); sg = obj->pages; bytes = sg_copy_from_buffer(sg->sgl, sg->nents, (void *)data, size); obj->dirty = 1; /* Backing store is now out of date */ i915_gem_object_unpin_pages(obj); if (WARN_ON(bytes != size)) { DRM_ERROR("Incomplete copy, wrote %zu of %zu", bytes, size); ret = -EFAULT; goto fail; } return obj; fail: drm_gem_object_unreference(&obj->base); return ERR_PTR(ret); }