From: Christoph Hellwig <hch@lst.de>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Tom Murphy <tmurphy@arista.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 15/24] iommu/dma: Merge the CMA and alloc_pages allocation paths
Date: Mon, 20 May 2019 09:29:39 +0200 [thread overview]
Message-ID: <20190520072948.11412-16-hch@lst.de> (raw)
In-Reply-To: <20190520072948.11412-1-hch@lst.de>
Instead of having a separate code path for the non-blocking alloc_pages
and CMA allocations paths merge them into one. There is a slight
behavior change here in that we try the page allocator if CMA fails.
This matches what dma-direct and other iommu drivers do and will be
needed to use the dma-iommu code on architectures without DMA remapping
later on.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/iommu/dma-iommu.c | 32 ++++++++++++--------------------
1 file changed, 12 insertions(+), 20 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index cffd30810d41..ee7dcf03c304 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -974,7 +974,7 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
bool coherent = dev_is_dma_coherent(dev);
int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
size_t iosize = size;
- struct page *page;
+ struct page *page = NULL;
void *addr;
size = PAGE_ALIGN(size);
@@ -984,35 +984,26 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
!(attrs & DMA_ATTR_FORCE_CONTIGUOUS))
return iommu_dma_alloc_remap(dev, iosize, handle, gfp, attrs);
- if (!gfpflags_allow_blocking(gfp)) {
- /*
- * In atomic context we can't remap anything, so we'll only
- * get the virtually contiguous buffer we need by way of a
- * physically contiguous allocation.
- */
- if (coherent) {
- page = alloc_pages(gfp, get_order(size));
- addr = page ? page_address(page) : NULL;
- } else {
- addr = dma_alloc_from_pool(size, &page, gfp);
- }
+ if (!gfpflags_allow_blocking(gfp) && !coherent) {
+ addr = dma_alloc_from_pool(size, &page, gfp);
if (!addr)
return NULL;
*handle = __iommu_dma_map(dev, page_to_phys(page), iosize,
ioprot);
if (*handle == DMA_MAPPING_ERROR) {
- if (coherent)
- __free_pages(page, get_order(size));
- else
- dma_free_from_pool(addr, size);
+ dma_free_from_pool(addr, size);
return NULL;
}
return addr;
}
- page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
- get_order(size), gfp & __GFP_NOWARN);
+ if (gfpflags_allow_blocking(gfp))
+ page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
+ get_order(size),
+ gfp & __GFP_NOWARN);
+ if (!page)
+ page = alloc_pages(gfp, get_order(size));
if (!page)
return NULL;
@@ -1038,7 +1029,8 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
out_unmap:
__iommu_dma_unmap(dev, *handle, iosize);
out_free_pages:
- dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT);
+ if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
+ __free_pages(page, get_order(size));
return NULL;
}
--
2.20.1
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next prev parent reply other threads:[~2019-05-20 7:34 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-20 7:29 implement generic dma_map_ops for IOMMUs v5 Christoph Hellwig
2019-05-20 7:29 ` [PATCH 01/24] arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable Christoph Hellwig
2019-05-22 12:54 ` Will Deacon
2019-05-20 7:29 ` [PATCH 02/24] iommu/dma: Cleanup dma-iommu.h Christoph Hellwig
2019-05-20 7:29 ` [PATCH 03/24] iommu/dma: Remove the flush_page callback Christoph Hellwig
2019-05-20 7:29 ` [PATCH 04/24] iommu/dma: Use for_each_sg in iommu_dma_alloc Christoph Hellwig
2019-05-20 7:29 ` [PATCH 05/24] iommu/dma: move the arm64 wrappers to common code Christoph Hellwig
2019-05-20 7:29 ` [PATCH 06/24] iommu/dma: Move __iommu_dma_map Christoph Hellwig
2019-05-20 7:29 ` [PATCH 07/24] iommu/dma: Move domain lookup into __iommu_dma_{map, unmap} Christoph Hellwig
2019-05-22 13:34 ` Robin Murphy
2019-05-22 15:57 ` Christoph Hellwig
2019-07-29 12:12 ` Shameerali Kolothum Thodi
2019-07-29 13:13 ` Robin Murphy
2019-05-20 7:29 ` [PATCH 08/24] iommu/dma: Squash __iommu_dma_{map,unmap}_page helpers Christoph Hellwig
2019-05-20 7:29 ` [PATCH 09/24] iommu/dma: Factor out remapped pages lookup Christoph Hellwig
2019-05-20 7:29 ` [PATCH 10/24] iommu/dma: Refactor the page array remapping allocator Christoph Hellwig
2019-05-20 7:29 ` [PATCH 11/24] iommu/dma: Remove __iommu_dma_free Christoph Hellwig
2019-05-20 7:29 ` [PATCH 12/24] iommu/dma: Refactor iommu_dma_free Christoph Hellwig
2019-05-20 7:29 ` [PATCH 13/24] iommu/dma: Refactor iommu_dma_alloc Christoph Hellwig
2019-05-20 7:29 ` [PATCH 14/24] iommu/dma: Don't remap CMA unnecessarily Christoph Hellwig
2019-05-20 7:29 ` Christoph Hellwig [this message]
2019-05-20 7:29 ` [PATCH 16/24] iommu/dma: Split iommu_dma_free Christoph Hellwig
2019-05-20 7:29 ` [PATCH 17/24] iommu/dma: Cleanup variable naming in iommu_dma_alloc Christoph Hellwig
2019-05-20 7:29 ` [PATCH 18/24] iommu/dma: Refactor iommu_dma_alloc, part 2 Christoph Hellwig
2019-05-20 7:29 ` [PATCH 19/24] iommu/dma: Refactor iommu_dma_get_sgtable Christoph Hellwig
2019-05-20 7:29 ` [PATCH 20/24] iommu/dma: Refactor iommu_dma_mmap Christoph Hellwig
2019-05-22 17:11 ` Robin Murphy
2019-05-20 7:29 ` [PATCH 21/24] iommu/dma: Don't depend on CONFIG_DMA_DIRECT_REMAP Christoph Hellwig
2019-05-20 7:29 ` [PATCH 22/24] iommu/dma: Switch copyright boilerplace to SPDX Christoph Hellwig
2019-05-20 7:29 ` [PATCH 23/24] arm64: switch copyright boilerplace to SPDX in dma-mapping.c Christoph Hellwig
2019-05-20 7:29 ` [PATCH 24/24] arm64: trim includes " Christoph Hellwig
2019-05-27 15:37 ` implement generic dma_map_ops for IOMMUs v5 Joerg Roedel
2019-05-27 15:38 ` Christoph Hellwig
2019-05-27 15:45 ` Joerg Roedel
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