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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>,
	Will Deacon <will.deacon@arm.com>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 17/23] iommu/dma: Refactor iommu_dma_alloc, part 2
Date: Thu, 23 May 2019 09:00:22 +0200	[thread overview]
Message-ID: <20190523070028.7435-18-hch@lst.de> (raw)
In-Reply-To: <20190523070028.7435-1-hch@lst.de>

All the logic in iommu_dma_alloc that deals with page allocation from
the CMA or page allocators can be split into a self-contained helper,
and we can than map the result of that or the atomic pool allocation
with the iommu later.  This also allows reusing __iommu_dma_free to
tear down the allocations and MMU mappings when the IOMMU mapping
fails.

Based on a patch from Robin Murphy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/iommu/dma-iommu.c | 65 +++++++++++++++++++++------------------
 1 file changed, 35 insertions(+), 30 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 9ac76d286df1..9f0aa80f2bdd 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -972,35 +972,14 @@ static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
 	__iommu_dma_free(dev, size, cpu_addr);
 }
 
-static void *iommu_dma_alloc(struct device *dev, size_t size,
-		dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
+static void *iommu_dma_alloc_pages(struct device *dev, size_t size,
+		struct page **pagep, gfp_t gfp, unsigned long attrs)
 {
 	bool coherent = dev_is_dma_coherent(dev);
-	int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
 	size_t alloc_size = PAGE_ALIGN(size);
 	struct page *page = NULL;
 	void *cpu_addr;
 
-	gfp |= __GFP_ZERO;
-
-	if (gfpflags_allow_blocking(gfp) &&
-	    !(attrs & DMA_ATTR_FORCE_CONTIGUOUS))
-		return iommu_dma_alloc_remap(dev, size, handle, gfp, attrs);
-
-	if (!gfpflags_allow_blocking(gfp) && !coherent) {
-		cpu_addr = dma_alloc_from_pool(alloc_size, &page, gfp);
-		if (!cpu_addr)
-			return NULL;
-
-		*handle = __iommu_dma_map(dev, page_to_phys(page), size,
-					  ioprot);
-		if (*handle == DMA_MAPPING_ERROR) {
-			dma_free_from_pool(cpu_addr, alloc_size);
-			return NULL;
-		}
-		return cpu_addr;
-	}
-
 	if (gfpflags_allow_blocking(gfp))
 		page = dma_alloc_from_contiguous(dev, alloc_size >> PAGE_SHIFT,
 						 get_order(alloc_size),
@@ -1010,33 +989,59 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
 	if (!page)
 		return NULL;
 
-	*handle = __iommu_dma_map(dev, page_to_phys(page), size, ioprot);
-	if (*handle == DMA_MAPPING_ERROR)
-		goto out_free_pages;
-
 	if (!coherent || PageHighMem(page)) {
 		pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
 
 		cpu_addr = dma_common_contiguous_remap(page, alloc_size,
 				VM_USERMAP, prot, __builtin_return_address(0));
 		if (!cpu_addr)
-			goto out_unmap;
+			goto out_free_pages;
 
 		if (!coherent)
 			arch_dma_prep_coherent(page, size);
 	} else {
 		cpu_addr = page_address(page);
 	}
+
+	*pagep = page;
 	memset(cpu_addr, 0, alloc_size);
 	return cpu_addr;
-out_unmap:
-	__iommu_dma_unmap(dev, *handle, size);
 out_free_pages:
 	if (!dma_release_from_contiguous(dev, page, alloc_size >> PAGE_SHIFT))
 		__free_pages(page, get_order(alloc_size));
 	return NULL;
 }
 
+static void *iommu_dma_alloc(struct device *dev, size_t size,
+		dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
+{
+	bool coherent = dev_is_dma_coherent(dev);
+	int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
+	struct page *page = NULL;
+	void *cpu_addr;
+
+	gfp |= __GFP_ZERO;
+
+	if (gfpflags_allow_blocking(gfp) &&
+	    !(attrs & DMA_ATTR_FORCE_CONTIGUOUS))
+		return iommu_dma_alloc_remap(dev, size, handle, gfp, attrs);
+
+	if (!gfpflags_allow_blocking(gfp) && !coherent)
+		cpu_addr = dma_alloc_from_pool(PAGE_ALIGN(size), &page, gfp);
+	else
+		cpu_addr = iommu_dma_alloc_pages(dev, size, &page, gfp, attrs);
+	if (!cpu_addr)
+		return NULL;
+
+	*handle = __iommu_dma_map(dev, page_to_phys(page), size, ioprot);
+	if (*handle == DMA_MAPPING_ERROR) {
+		__iommu_dma_free(dev, size, cpu_addr);
+		return NULL;
+	}
+
+	return cpu_addr;
+}
+
 static int __iommu_dma_mmap_pfn(struct vm_area_struct *vma,
 			      unsigned long pfn, size_t size)
 {
-- 
2.20.1


  parent reply	other threads:[~2019-05-23  7:01 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-23  7:00 implement generic dma_map_ops for IOMMUs v6 Christoph Hellwig
2019-05-23  7:00 ` [PATCH 01/23] iommu/dma: Cleanup dma-iommu.h Christoph Hellwig
2019-05-23  7:00 ` [PATCH 02/23] iommu/dma: Remove the flush_page callback Christoph Hellwig
2019-05-23  7:00 ` [PATCH 03/23] iommu/dma: Use for_each_sg in iommu_dma_alloc Christoph Hellwig
2019-05-23  7:00 ` [PATCH 04/23] iommu/dma: move the arm64 wrappers to common code Christoph Hellwig
2019-05-23  7:00 ` [PATCH 05/23] iommu/dma: Move __iommu_dma_map Christoph Hellwig
2019-05-23  7:00 ` [PATCH 06/23] iommu/dma: Move domain lookup into __iommu_dma_{map,unmap} Christoph Hellwig
2019-05-23  7:00 ` [PATCH 07/23] iommu/dma: Squash __iommu_dma_{map,unmap}_page helpers Christoph Hellwig
2019-05-23  7:00 ` [PATCH 08/23] iommu/dma: Factor out remapped pages lookup Christoph Hellwig
2019-05-23  7:00 ` [PATCH 09/23] iommu/dma: Refactor the page array remapping allocator Christoph Hellwig
2019-05-23  7:00 ` [PATCH 10/23] iommu/dma: Remove __iommu_dma_free Christoph Hellwig
2019-05-23  7:00 ` [PATCH 11/23] iommu/dma: Refactor iommu_dma_free Christoph Hellwig
2019-05-23  7:00 ` [PATCH 12/23] iommu/dma: Refactor iommu_dma_alloc Christoph Hellwig
2019-05-23  7:00 ` [PATCH 13/23] iommu/dma: Don't remap CMA unnecessarily Christoph Hellwig
2019-05-23  7:00 ` [PATCH 14/23] iommu/dma: Merge the CMA and alloc_pages allocation paths Christoph Hellwig
2019-05-23  7:00 ` [PATCH 15/23] iommu/dma: Split iommu_dma_free Christoph Hellwig
2019-05-23  7:00 ` [PATCH 16/23] iommu/dma: Cleanup variable naming in iommu_dma_alloc Christoph Hellwig
2019-05-23  7:00 ` Christoph Hellwig [this message]
2019-05-23  7:00 ` [PATCH 18/23] iommu/dma: Refactor iommu_dma_get_sgtable Christoph Hellwig
2019-05-23  7:00 ` [PATCH 19/23] iommu/dma: Refactor iommu_dma_mmap Christoph Hellwig
2019-05-23  7:00 ` [PATCH 20/23] iommu/dma: Don't depend on CONFIG_DMA_DIRECT_REMAP Christoph Hellwig
2019-05-23  7:00 ` [PATCH 21/23] iommu/dma: Switch copyright boilerplace to SPDX Christoph Hellwig
2019-05-23  7:00 ` [PATCH 22/23] arm64: switch copyright boilerplace to SPDX in dma-mapping.c Christoph Hellwig
2019-05-23  7:00 ` [PATCH 23/23] arm64: trim includes " Christoph Hellwig
2019-05-23 12:33 ` implement generic dma_map_ops for IOMMUs v6 Robin Murphy

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