kernel/qxl-fixes.patch

From 56cbcb6c41932b19ef0d838f1ff25a662a2e403d Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 19 Oct 2017 08:21:49 +0200
Subject: [PATCH] drm/qxl: replace QXL_INFO with DRM_DEBUG_DRIVER

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20171019062150.28090-2-kraxel@redhat.com
---
 drivers/gpu/drm/qxl/qxl_cmd.c     | 16 +++++++---------
 drivers/gpu/drm/qxl/qxl_drv.h     | 26 +-------------------------
 drivers/gpu/drm/qxl/qxl_fb.c      | 13 +++++--------
 drivers/gpu/drm/qxl/qxl_release.c |  5 ++---
 drivers/gpu/drm/qxl/qxl_ttm.c     |  4 ++--
 5 files changed, 17 insertions(+), 47 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
index 74fc9362ecf9..8ec53d5abd62 100644
--- a/drivers/gpu/drm/qxl/qxl_cmd.c
+++ b/drivers/gpu/drm/qxl/qxl_cmd.c
@@ -219,7 +219,7 @@ int qxl_garbage_collect(struct qxl_device *qdev)
 	union qxl_release_info *info;

 	while (qxl_ring_pop(qdev->release_ring, &id)) {
-		QXL_INFO(qdev, "popped %lld\n", id);
+		DRM_DEBUG_DRIVER("popped %lld\n", id);
 		while (id) {
 			release = qxl_release_from_id_locked(qdev, id);
 			if (release == NULL)
@@ -229,8 +229,8 @@ int qxl_garbage_collect(struct qxl_device *qdev)
 			next_id = info->next;
 			qxl_release_unmap(qdev, release, info);

-			QXL_INFO(qdev, "popped %lld, next %lld\n", id,
-				next_id);
+			DRM_DEBUG_DRIVER("popped %lld, next %lld\n", id,
+					 next_id);

 			switch (release->type) {
 			case QXL_RELEASE_DRAWABLE:
@@ -248,7 +248,7 @@ int qxl_garbage_collect(struct qxl_device *qdev)
 		}
 	}

-	QXL_INFO(qdev, "%s: %d\n", __func__, i);
+	DRM_DEBUG_DRIVER("%d\n", i);

 	return i;
 }
@@ -381,8 +381,7 @@ void qxl_io_create_primary(struct qxl_device *qdev,
 {
 	struct qxl_surface_create *create;

-	QXL_INFO(qdev, "%s: qdev %p, ram_header %p\n", __func__, qdev,
-		 qdev->ram_header);
+	DRM_DEBUG_DRIVER("qdev %p, ram_header %p\n", qdev, qdev->ram_header);
 	create = &qdev->ram_header->create_surface;
 	create->format = bo->surf.format;
 	create->width = bo->surf.width;
@@ -390,8 +389,7 @@ void qxl_io_create_primary(struct qxl_device *qdev,
 	create->stride = bo->surf.stride;
 	create->mem = qxl_bo_physical_address(qdev, bo, offset);

-	QXL_INFO(qdev, "%s: mem = %llx, from %p\n", __func__, create->mem,
-		 bo->kptr);
+	DRM_DEBUG_DRIVER("mem = %llx, from %p\n", create->mem, bo->kptr);

 	create->flags = QXL_SURF_FLAG_KEEP_DATA;
 	create->type = QXL_SURF_TYPE_PRIMARY;
@@ -401,7 +399,7 @@ void qxl_io_create_primary(struct qxl_device *qdev,

 void qxl_io_memslot_add(struct qxl_device *qdev, uint8_t id)
 {
-	QXL_INFO(qdev, "qxl_memslot_add %d\n", id);
+	DRM_DEBUG_DRIVER("qxl_memslot_add %d\n", id);
 	wait_for_io_cmd(qdev, id, QXL_IO_MEMSLOT_ADD_ASYNC);
 }

diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 3397a1907336..d707b351875c 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -62,33 +62,9 @@

 #define QXL_DEBUGFS_MAX_COMPONENTS		32

-extern int qxl_log_level;
 extern int qxl_num_crtc;
 extern int qxl_max_ioctls;

-enum {
-	QXL_INFO_LEVEL = 1,
-	QXL_DEBUG_LEVEL = 2,
-};
-
-#define QXL_INFO(qdev, fmt, ...) do { \
-		if (qxl_log_level >= QXL_INFO_LEVEL) {	\
-			qxl_io_log(qdev, fmt, __VA_ARGS__); \
-		}	\
-	} while (0)
-#define QXL_DEBUG(qdev, fmt, ...) do { \
-		if (qxl_log_level >= QXL_DEBUG_LEVEL) {	\
-			qxl_io_log(qdev, fmt, __VA_ARGS__); \
-		}	\
-	} while (0)
-#define QXL_INFO_ONCE(qdev, fmt, ...) do { \
-		static int done;		\
-		if (!done) {			\
-			done = 1;			\
-			QXL_INFO(qdev, fmt, __VA_ARGS__);	\
-		}						\
-	} while (0)
-
 #define DRM_FILE_OFFSET 0x100000000ULL
 #define DRM_FILE_PAGE_OFFSET (DRM_FILE_OFFSET >> PAGE_SHIFT)

@@ -351,7 +327,7 @@ int qxl_check_idle(struct qxl_ring *ring);
 static inline void *
 qxl_fb_virtual_address(struct qxl_device *qdev, unsigned long physical)
 {
-	QXL_INFO(qdev, "not implemented (%lu)\n", physical);
+	DRM_DEBUG_DRIVER("not implemented (%lu)\n", physical);
 	return 0;
 }

diff --git a/drivers/gpu/drm/qxl/qxl_fb.c b/drivers/gpu/drm/qxl/qxl_fb.c
index 844c4a31ca13..23af3e352673 100644
--- a/drivers/gpu/drm/qxl/qxl_fb.c
+++ b/drivers/gpu/drm/qxl/qxl_fb.c
@@ -240,18 +240,15 @@ static int qxlfb_create(struct qxl_fbdev *qfbdev,
 		return ret;

 	qbo = gem_to_qxl_bo(gobj);
-	QXL_INFO(qdev, "%s: %dx%d %d\n", __func__, mode_cmd.width,
-		 mode_cmd.height, mode_cmd.pitches[0]);
+	DRM_DEBUG_DRIVER("%dx%d %d\n", mode_cmd.width,
+			 mode_cmd.height, mode_cmd.pitches[0]);

 	shadow = vmalloc(mode_cmd.pitches[0] * mode_cmd.height);
 	/* TODO: what's the usual response to memory allocation errors? */
 	BUG_ON(!shadow);
-	QXL_INFO(qdev,
-	"surface0 at gpu offset %lld, mmap_offset %lld (virt %p, shadow %p)\n",
-		 qxl_bo_gpu_offset(qbo),
-		 qxl_bo_mmap_offset(qbo),
-		 qbo->kptr,
-		 shadow);
+	DRM_DEBUG_DRIVER("surface0 at gpu offset %lld, mmap_offset %lld (virt %p, shadow %p)\n",
+			 qxl_bo_gpu_offset(qbo), qxl_bo_mmap_offset(qbo),
+			 qbo->kptr, shadow);
 	size = mode_cmd.pitches[0] * mode_cmd.height;

 	info = drm_fb_helper_alloc_fbi(&qfbdev->helper);
diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index e6ec845b5be0..a6da6fa6ad58 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -154,7 +154,7 @@ qxl_release_alloc(struct qxl_device *qdev, int type,
 		return handle;
 	}
 	*ret = release;
-	QXL_INFO(qdev, "allocated release %d\n", handle);
+	DRM_DEBUG_DRIVER("allocated release %d\n", handle);
 	release->id = handle;
 	return handle;
 }
@@ -179,8 +179,7 @@ void
 qxl_release_free(struct qxl_device *qdev,
 		 struct qxl_release *release)
 {
-	QXL_INFO(qdev, "release %d, type %d\n", release->id,
-		 release->type);
+	DRM_DEBUG_DRIVER("release %d, type %d\n", release->id, release->type);

 	if (release->surface_release_id)
 		qxl_surface_id_dealloc(qdev, release->surface_release_id);
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 7ecf8a4b9fe6..ab4823875311 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -136,8 +136,8 @@ int qxl_mmap(struct file *filp, struct vm_area_struct *vma)
 		 "filp->private_data->minor->dev->dev_private == NULL\n");
 		return -EINVAL;
 	}
-	QXL_INFO(qdev, "%s: filp->private_data = 0x%p, vma->vm_pgoff = %lx\n",
-		 __func__, filp->private_data, vma->vm_pgoff);
+	DRM_DEBUG_DRIVER("filp->private_data = 0x%p, vma->vm_pgoff = %lx\n",
+		  filp->private_data, vma->vm_pgoff);

 	r = ttm_bo_mmap(filp, vma, &qdev->mman.bdev);
 	if (unlikely(r != 0))
-- 
2.14.3

From 62676d10b483a2ff6e8b08c5e7c7d63a831343f5 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 19 Oct 2017 08:21:50 +0200
Subject: [PATCH] qxl: alloc & use shadow for dumb buffers

This patch changes the way the primary surface is used for dumb
framebuffers.  Instead of configuring the bo itself as primary surface
a shadow bo is created and used instead.  Framebuffers can share the
shadow bo in case they have the same format and resolution.

On atomic plane updates we don't have to update the primary surface in
case we pageflip from one framebuffer to another framebuffer which
shares the same shadow.  This in turn avoids the flicker caused by the
primary-destroy + primary-create cycle, which is very annonying when
running wayland on qxl.

The qxl driver never actually writes to the shadow bo.  It sends qxl
blit commands which update it though, and the spice server might
actually execute them (and thereby write to the shadow) in case the
local rendering is kicked for some reason.  This happens for example in
case qemu is asked to write out a dump of the guest display (screendump
monitor command).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20171019062150.28090-3-kraxel@redhat.com
---
 drivers/gpu/drm/qxl/qxl_cmd.c     |  6 ++++-
 drivers/gpu/drm/qxl/qxl_display.c | 49 ++++++++++++++++++++++++++++++++++++---
 drivers/gpu/drm/qxl/qxl_drv.h     |  2 ++
 drivers/gpu/drm/qxl/qxl_dumb.c    |  1 +
 4 files changed, 54 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
index 8ec53d5abd62..c0fb52c6d4ca 100644
--- a/drivers/gpu/drm/qxl/qxl_cmd.c
+++ b/drivers/gpu/drm/qxl/qxl_cmd.c
@@ -387,7 +387,11 @@ void qxl_io_create_primary(struct qxl_device *qdev,
 	create->width = bo->surf.width;
 	create->height = bo->surf.height;
 	create->stride = bo->surf.stride;
-	create->mem = qxl_bo_physical_address(qdev, bo, offset);
+	if (bo->shadow) {
+		create->mem = qxl_bo_physical_address(qdev, bo->shadow, offset);
+	} else {
+		create->mem = qxl_bo_physical_address(qdev, bo, offset);
+	}

 	DRM_DEBUG_DRIVER("mem = %llx, from %p\n", create->mem, bo->kptr);

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index afbf50d0c08f..4756b3c9bf2c 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -305,7 +305,9 @@ static const struct drm_crtc_funcs qxl_crtc_funcs = {
 void qxl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 {
 	struct qxl_framebuffer *qxl_fb = to_qxl_framebuffer(fb);
+	struct qxl_bo *bo = gem_to_qxl_bo(qxl_fb->obj);

+	WARN_ON(bo->shadow);
 	drm_gem_object_unreference_unlocked(qxl_fb->obj);
 	drm_framebuffer_cleanup(fb);
 	kfree(qxl_fb);
@@ -508,6 +510,7 @@ static void qxl_primary_atomic_update(struct drm_plane *plane,
 	    .x2 = qfb->base.width,
 	    .y2 = qfb->base.height
 	};
+	bool same_shadow = false;

 	if (old_state->fb) {
 		qfb_old = to_qxl_framebuffer(old_state->fb);
@@ -519,15 +522,23 @@ static void qxl_primary_atomic_update(struct drm_plane *plane,
 	if (bo == bo_old)
 		return;

+	if (bo_old && bo_old->shadow && bo->shadow &&
+	    bo_old->shadow == bo->shadow) {
+		same_shadow = true;
+	}
+
 	if (bo_old && bo_old->is_primary) {
-		qxl_io_destroy_primary(qdev);
+		if (!same_shadow)
+			qxl_io_destroy_primary(qdev);
 		bo_old->is_primary = false;
 	}

 	if (!bo->is_primary) {
-		qxl_io_create_primary(qdev, 0, bo);
+		if (!same_shadow)
+			qxl_io_create_primary(qdev, 0, bo);
 		bo->is_primary = true;
 	}
+
 	qxl_draw_dirty_fb(qdev, qfb, bo, 0, 0, &norect, 1, 1);
 }

@@ -679,8 +690,9 @@ static void qxl_cursor_atomic_disable(struct drm_plane *plane,
 static int qxl_plane_prepare_fb(struct drm_plane *plane,
 				struct drm_plane_state *new_state)
 {
+	struct qxl_device *qdev = plane->dev->dev_private;
 	struct drm_gem_object *obj;
-	struct qxl_bo *user_bo;
+	struct qxl_bo *user_bo, *old_bo = NULL;
 	int ret;

 	if (!new_state->fb)
@@ -689,6 +701,32 @@ static int qxl_plane_prepare_fb(struct drm_plane *plane,
 	obj = to_qxl_framebuffer(new_state->fb)->obj;
 	user_bo = gem_to_qxl_bo(obj);

+	if (plane->type == DRM_PLANE_TYPE_PRIMARY &&
+	    user_bo->is_dumb && !user_bo->shadow) {
+		if (plane->state->fb) {
+			obj = to_qxl_framebuffer(plane->state->fb)->obj;
+			old_bo = gem_to_qxl_bo(obj);
+		}
+		if (old_bo && old_bo->shadow &&
+		    user_bo->gem_base.size == old_bo->gem_base.size &&
+		    plane->state->crtc     == new_state->crtc &&
+		    plane->state->crtc_w   == new_state->crtc_w &&
+		    plane->state->crtc_h   == new_state->crtc_h &&
+		    plane->state->src_x    == new_state->src_x &&
+		    plane->state->src_y    == new_state->src_y &&
+		    plane->state->src_w    == new_state->src_w &&
+		    plane->state->src_h    == new_state->src_h &&
+		    plane->state->rotation == new_state->rotation &&
+		    plane->state->zpos     == new_state->zpos) {
+			drm_gem_object_get(&old_bo->shadow->gem_base);
+			user_bo->shadow = old_bo->shadow;
+		} else {
+			qxl_bo_create(qdev, user_bo->gem_base.size,
+				      true, true, QXL_GEM_DOMAIN_VRAM, NULL,
+				      &user_bo->shadow);
+		}
+	}
+
 	ret = qxl_bo_pin(user_bo, QXL_GEM_DOMAIN_CPU, NULL);
 	if (ret)
 		return ret;
@@ -713,6 +751,11 @@ static void qxl_plane_cleanup_fb(struct drm_plane *plane,
 	obj = to_qxl_framebuffer(old_state->fb)->obj;
 	user_bo = gem_to_qxl_bo(obj);
 	qxl_bo_unpin(user_bo);
+
+	if (user_bo->shadow && !user_bo->is_primary) {
+		drm_gem_object_put_unlocked(&user_bo->shadow->gem_base);
+		user_bo->shadow = NULL;
+	}
 }

 static const uint32_t qxl_cursor_plane_formats[] = {
diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index d707b351875c..08752c0ffb35 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -89,6 +89,8 @@ struct qxl_bo {
 	/* Constant after initialization */
 	struct drm_gem_object		gem_base;
 	bool is_primary; /* is this now a primary surface */
+	bool is_dumb;
+	struct qxl_bo *shadow;
 	bool hw_surf_alloc;
 	struct qxl_surface surf;
 	uint32_t surface_id;
diff --git a/drivers/gpu/drm/qxl/qxl_dumb.c b/drivers/gpu/drm/qxl/qxl_dumb.c
index 5e65d5d2d937..11085ab01374 100644
--- a/drivers/gpu/drm/qxl/qxl_dumb.c
+++ b/drivers/gpu/drm/qxl/qxl_dumb.c
@@ -63,6 +63,7 @@ int qxl_mode_dumb_create(struct drm_file *file_priv,
 					      &handle);
 	if (r)
 		return r;
+	qobj->is_dumb = true;
 	args->pitch = pitch;
 	args->handle = handle;
 	return 0;
-- 
2.14.3