[PATCH 16/26] iommu/dma: Don't remap CMA unnecessarily

From: Christoph Hellwig <hch@lst.de>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 16/26] iommu/dma: Don't remap CMA unnecessarily
Date: Mon, 22 Apr 2019 19:59:32 +0200	[thread overview]
Message-ID: <20190422175942.18788-17-hch@lst.de> (raw)
In-Reply-To: <20190422175942.18788-1-hch@lst.de>

From: Robin Murphy <robin.murphy@arm.com>

Always remapping CMA allocations was largely a bodge to keep the freeing
logic manageable when it was split between here and an arch wrapper. Now
that it's all together and streamlined, we can relax that limitation.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/iommu/dma-iommu.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 504dd27312bb..6f4febf5e1de 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -956,7 +956,6 @@ 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);
-	pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
 	size_t iosize = size;
 	struct page *page;
 	void *addr;
@@ -1004,13 +1003,19 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
 	if (*handle == DMA_MAPPING_ERROR)
 		goto out_free_pages;
 
-	addr = dma_common_contiguous_remap(page, size, VM_USERMAP, prot,
-			__builtin_return_address(0));
-	if (!addr)
-		goto out_unmap;
+	if (!coherent || PageHighMem(page)) {
+		pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
 
-	if (!coherent)
-		arch_dma_prep_coherent(page, iosize);
+		addr = dma_common_contiguous_remap(page, size, VM_USERMAP, prot,
+				__builtin_return_address(0));
+		if (!addr)
+			goto out_unmap;
+
+		if (!coherent)
+			arch_dma_prep_coherent(page, iosize);
+	} else {
+		addr = page_address(page);
+	}
 	memset(addr, 0, size);
 	return addr;
 out_unmap:
-- 
2.20.1

