arm: fixes for rpi4
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From patchwork Fri Aug 14 10:26:23 2020
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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To: amit.pundir@linaro.org, hch@lst.de, linux-kernel@vger.kernel.org,
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Marek Szyprowski <m.szyprowski@samsung.com>,
|
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Robin Murphy <robin.murphy@arm.com>
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Cc: rientjes@google.com, jeremy.linton@arm.com,
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linux-rpi-kernel@lists.infradead.org,
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Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
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iommu@lists.linux-foundation.org
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Subject: [PATCH v4 1/2] dma-pool: Only allocate from CMA when in same memory
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zone
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Date: Fri, 14 Aug 2020 12:26:23 +0200
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There is no guarantee to CMA's placement, so allocating a zone specific
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atomic pool from CMA might return memory from a completely different
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memory zone. To get around this double check CMA's placement before
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allocating from it.
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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[hch: rebased, added a fallback to the page allocator, allow dipping into
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lower CMA pools]
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Signed-off-by: Christoph Hellwig <hch@lst.de>
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---
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Changes since v3:
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- Do not use memblock_start_of_DRAM()
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Changes since v2:
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- Go back to v1 behavior
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kernel/dma/pool.c | 31 ++++++++++++++++++++++++++++++-
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1 file changed, 30 insertions(+), 1 deletion(-)
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diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
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index 6bc74a2d5127..57f4a0f32a92 100644
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--- a/kernel/dma/pool.c
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+++ b/kernel/dma/pool.c
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@@ -3,7 +3,9 @@
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* Copyright (C) 2012 ARM Ltd.
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* Copyright (C) 2020 Google LLC
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*/
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+#include <linux/cma.h>
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#include <linux/debugfs.h>
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+#include <linux/dma-contiguous.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-noncoherent.h>
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#include <linux/init.h>
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@@ -55,6 +57,29 @@ static void dma_atomic_pool_size_add(gfp_t gfp, size_t size)
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pool_size_kernel += size;
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}
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+static bool cma_in_zone(gfp_t gfp)
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+{
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+ unsigned long size;
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+ phys_addr_t end;
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+ struct cma *cma;
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+
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+ cma = dev_get_cma_area(NULL);
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+ if (!cma)
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+ return false;
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+
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+ size = cma_get_size(cma);
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+ if (!size)
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+ return false;
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+
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+ /* CMA can't cross zone boundaries, see cma_activate_area() */
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+ end = cma_get_base(cma) + size - 1;
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+ if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA))
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+ return end <= DMA_BIT_MASK(zone_dma_bits);
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+ if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32))
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+ return end <= DMA_BIT_MASK(32);
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+ return true;
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+}
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+
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static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
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gfp_t gfp)
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{
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@@ -68,7 +93,11 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
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do {
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pool_size = 1 << (PAGE_SHIFT + order);
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- page = alloc_pages(gfp, order);
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+ if (cma_in_zone(gfp))
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+ page = dma_alloc_from_contiguous(NULL, 1 << order,
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+ order, false);
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+ if (!page)
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+ page = alloc_pages(gfp, order);
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} while (!page && order-- > 0);
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if (!page)
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goto out;
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From patchwork Fri Aug 14 10:26:24 2020
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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To: amit.pundir@linaro.org, hch@lst.de, linux-kernel@vger.kernel.org,
|
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Joerg Roedel <joro@8bytes.org>,
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Marek Szyprowski <m.szyprowski@samsung.com>,
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Robin Murphy <robin.murphy@arm.com>
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Cc: rientjes@google.com, jeremy.linton@arm.com,
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linux-rpi-kernel@lists.infradead.org,
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iommu@lists.linux-foundation.org
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Subject: [PATCH v4 2/2] dma-pool: fix coherent pool allocations for IOMMU
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mappings
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Date: Fri, 14 Aug 2020 12:26:24 +0200
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From: Christoph Hellwig <hch@lst.de>
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When allocating coherent pool memory for an IOMMU mapping we don't care
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about the DMA mask. Move the guess for the initial GFP mask into the
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dma_direct_alloc_pages and pass dma_coherent_ok as a function pointer
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argument so that it doesn't get applied to the IOMMU case.
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Signed-off-by: Christoph Hellwig <hch@lst.de>
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---
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Changes since v1:
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- Check if phys_addr_ok() exists prior calling it
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drivers/iommu/dma-iommu.c | 4 +-
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include/linux/dma-direct.h | 3 -
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include/linux/dma-mapping.h | 5 +-
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kernel/dma/direct.c | 13 ++--
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kernel/dma/pool.c | 114 +++++++++++++++---------------------
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5 files changed, 62 insertions(+), 77 deletions(-)
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diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
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index 4959f5df21bd..5141d49a046b 100644
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--- a/drivers/iommu/dma-iommu.c
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+++ b/drivers/iommu/dma-iommu.c
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@@ -1035,8 +1035,8 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
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if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
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!gfpflags_allow_blocking(gfp) && !coherent)
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- cpu_addr = dma_alloc_from_pool(dev, PAGE_ALIGN(size), &page,
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- gfp);
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+ page = dma_alloc_from_pool(dev, PAGE_ALIGN(size), &cpu_addr,
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+ gfp, NULL);
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else
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cpu_addr = iommu_dma_alloc_pages(dev, size, &page, gfp, attrs);
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if (!cpu_addr)
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diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
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index 5a3ce2a24794..6e87225600ae 100644
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--- a/include/linux/dma-direct.h
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+++ b/include/linux/dma-direct.h
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@@ -73,9 +73,6 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
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}
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u64 dma_direct_get_required_mask(struct device *dev);
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-gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
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- u64 *phys_mask);
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-bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size);
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void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t gfp, unsigned long attrs);
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void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
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diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
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index 016b96b384bd..52635e91143b 100644
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--- a/include/linux/dma-mapping.h
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+++ b/include/linux/dma-mapping.h
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@@ -522,8 +522,9 @@ void *dma_common_pages_remap(struct page **pages, size_t size,
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pgprot_t prot, const void *caller);
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void dma_common_free_remap(void *cpu_addr, size_t size);
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-void *dma_alloc_from_pool(struct device *dev, size_t size,
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- struct page **ret_page, gfp_t flags);
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+struct page *dma_alloc_from_pool(struct device *dev, size_t size,
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+ void **cpu_addr, gfp_t flags,
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+ bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t));
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bool dma_free_from_pool(struct device *dev, void *start, size_t size);
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int
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diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
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index bb0041e99659..db6ef07aec3b 100644
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--- a/kernel/dma/direct.c
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+++ b/kernel/dma/direct.c
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@@ -43,7 +43,7 @@ u64 dma_direct_get_required_mask(struct device *dev)
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return (1ULL << (fls64(max_dma) - 1)) * 2 - 1;
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}
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-gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
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+static gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
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u64 *phys_limit)
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{
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u64 dma_limit = min_not_zero(dma_mask, dev->bus_dma_limit);
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@@ -68,7 +68,7 @@ gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
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return 0;
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}
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-bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
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+static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
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{
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return phys_to_dma_direct(dev, phys) + size - 1 <=
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min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit);
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@@ -161,8 +161,13 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
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size = PAGE_ALIGN(size);
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if (dma_should_alloc_from_pool(dev, gfp, attrs)) {
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- ret = dma_alloc_from_pool(dev, size, &page, gfp);
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- if (!ret)
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+ u64 phys_mask;
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+
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+ gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
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+ &phys_mask);
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+ page = dma_alloc_from_pool(dev, size, &ret, gfp,
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+ dma_coherent_ok);
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+ if (!page)
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return NULL;
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goto done;
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}
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diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
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index 57f4a0f32a92..b0aaba4197ae 100644
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--- a/kernel/dma/pool.c
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+++ b/kernel/dma/pool.c
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@@ -225,93 +225,75 @@ static int __init dma_atomic_pool_init(void)
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}
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postcore_initcall(dma_atomic_pool_init);
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-static inline struct gen_pool *dma_guess_pool_from_device(struct device *dev)
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+static inline struct gen_pool *dma_guess_pool(struct gen_pool *prev, gfp_t gfp)
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{
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- u64 phys_mask;
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- gfp_t gfp;
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-
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- gfp = dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
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- &phys_mask);
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- if (IS_ENABLED(CONFIG_ZONE_DMA) && gfp == GFP_DMA)
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+ if (prev == NULL) {
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+ if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32))
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+ return atomic_pool_dma32;
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+ if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA))
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+ return atomic_pool_dma;
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+ return atomic_pool_kernel;
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+ }
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+ if (prev == atomic_pool_kernel)
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+ return atomic_pool_dma32 ? atomic_pool_dma32 : atomic_pool_dma;
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+ if (prev == atomic_pool_dma32)
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return atomic_pool_dma;
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- if (IS_ENABLED(CONFIG_ZONE_DMA32) && gfp == GFP_DMA32)
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- return atomic_pool_dma32;
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- return atomic_pool_kernel;
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+ return NULL;
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}
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-static inline struct gen_pool *dma_get_safer_pool(struct gen_pool *bad_pool)
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+static struct page *__dma_alloc_from_pool(struct device *dev, size_t size,
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+ struct gen_pool *pool, void **cpu_addr,
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+ bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t))
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{
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- if (bad_pool == atomic_pool_kernel)
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- return atomic_pool_dma32 ? : atomic_pool_dma;
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+ unsigned long addr;
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+ phys_addr_t phys;
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- if (bad_pool == atomic_pool_dma32)
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- return atomic_pool_dma;
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+ addr = gen_pool_alloc(pool, size);
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+ if (!addr)
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+ return NULL;
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- return NULL;
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-}
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+ phys = gen_pool_virt_to_phys(pool, addr);
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+ if (phys_addr_ok && !phys_addr_ok(dev, phys, size)) {
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+ gen_pool_free(pool, addr, size);
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+ return NULL;
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+ }
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-static inline struct gen_pool *dma_guess_pool(struct device *dev,
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- struct gen_pool *bad_pool)
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-{
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- if (bad_pool)
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- return dma_get_safer_pool(bad_pool);
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+ if (gen_pool_avail(pool) < atomic_pool_size)
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+ schedule_work(&atomic_pool_work);
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- return dma_guess_pool_from_device(dev);
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+ *cpu_addr = (void *)addr;
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+ memset(*cpu_addr, 0, size);
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+ return pfn_to_page(__phys_to_pfn(phys));
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}
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-void *dma_alloc_from_pool(struct device *dev, size_t size,
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- struct page **ret_page, gfp_t flags)
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+struct page *dma_alloc_from_pool(struct device *dev, size_t size,
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+ void **cpu_addr, gfp_t gfp,
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+ bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t))
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{
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struct gen_pool *pool = NULL;
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- unsigned long val = 0;
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- void *ptr = NULL;
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- phys_addr_t phys;
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-
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- while (1) {
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- pool = dma_guess_pool(dev, pool);
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- if (!pool) {
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- WARN(1, "Failed to get suitable pool for %s\n",
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- dev_name(dev));
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- break;
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||||
- }
|
||||
-
|
||||
- val = gen_pool_alloc(pool, size);
|
||||
- if (!val)
|
||||
- continue;
|
||||
-
|
||||
- phys = gen_pool_virt_to_phys(pool, val);
|
||||
- if (dma_coherent_ok(dev, phys, size))
|
||||
- break;
|
||||
-
|
||||
- gen_pool_free(pool, val, size);
|
||||
- val = 0;
|
||||
- }
|
||||
-
|
||||
-
|
||||
- if (val) {
|
||||
- *ret_page = pfn_to_page(__phys_to_pfn(phys));
|
||||
- ptr = (void *)val;
|
||||
- memset(ptr, 0, size);
|
||||
+ struct page *page;
|
||||
|
||||
- if (gen_pool_avail(pool) < atomic_pool_size)
|
||||
- schedule_work(&atomic_pool_work);
|
||||
+ while ((pool = dma_guess_pool(pool, gfp))) {
|
||||
+ page = __dma_alloc_from_pool(dev, size, pool, cpu_addr,
|
||||
+ phys_addr_ok);
|
||||
+ if (page)
|
||||
+ return page;
|
||||
}
|
||||
|
||||
- return ptr;
|
||||
+ WARN(1, "Failed to get suitable pool for %s\n", dev_name(dev));
|
||||
+ return NULL;
|
||||
}
|
||||
|
||||
bool dma_free_from_pool(struct device *dev, void *start, size_t size)
|
||||
{
|
||||
struct gen_pool *pool = NULL;
|
||||
|
||||
- while (1) {
|
||||
- pool = dma_guess_pool(dev, pool);
|
||||
- if (!pool)
|
||||
- return false;
|
||||
-
|
||||
- if (gen_pool_has_addr(pool, (unsigned long)start, size)) {
|
||||
- gen_pool_free(pool, (unsigned long)start, size);
|
||||
- return true;
|
||||
- }
|
||||
+ while ((pool = dma_guess_pool(pool, 0))) {
|
||||
+ if (!gen_pool_has_addr(pool, (unsigned long)start, size))
|
||||
+ continue;
|
||||
+ gen_pool_free(pool, (unsigned long)start, size);
|
||||
+ return true;
|
||||
}
|
||||
+
|
||||
+ return false;
|
||||
}
|
|
@ -56,7 +56,7 @@ Summary: The Linux kernel
|
|||
%global zipsed -e 's/\.ko$/\.ko.xz/'
|
||||
%endif
|
||||
|
||||
# define buildid .local
|
||||
%define buildid .rpi1
|
||||
|
||||
%if 0%{?fedora}
|
||||
%define primary_target fedora
|
||||
|
@ -860,6 +860,9 @@ Patch100: 0001-Work-around-for-gcc-bug-https-gcc.gnu.org-bugzilla-s.patch
|
|||
Patch101: 0001-PCI-Add-MCFG-quirks-for-Tegra194-host-controllers.patch
|
||||
Patch102: 0002-arm64-tegra-Re-order-PCIe-aperture-mappings-to-suppo.patch
|
||||
Patch103: arm64-tegra-Use-valid-PWM-period-for-VDD_GPU-on-Tegra210.patch
|
||||
|
||||
# https://lkml.org/lkml/2020/8/14/221
|
||||
Patch104: dma-pool-fixes.patch
|
||||
# END OF PATCH DEFINITIONS
|
||||
|
||||
%endif
|
||||
|
|
Loading…
Reference in New Issue