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 10/19] dma-iommu: factor atomic pool allocations into helpers
Date: Mon, 14 Jan 2019 10:41:50 +0100 [thread overview]
Message-ID: <20190114094159.27326-11-hch@lst.de> (raw)
In-Reply-To: <20190114094159.27326-1-hch@lst.de>
This keeps the code together and will simplify compiling the code
out on architectures that are always dma coherent.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/iommu/dma-iommu.c | 51 +++++++++++++++++++++++++++++----------
1 file changed, 38 insertions(+), 13 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 95d30b96e5bd..fdd283f45656 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -666,6 +666,35 @@ static int iommu_dma_get_sgtable_remap(struct sg_table *sgt, void *cpu_addr,
GFP_KERNEL);
}
+static void iommu_dma_free_pool(struct device *dev, size_t size,
+ void *vaddr, dma_addr_t dma_handle)
+{
+ __iommu_dma_unmap(iommu_get_domain_for_dev(dev), dma_handle, size);
+ dma_free_from_pool(vaddr, PAGE_ALIGN(size));
+}
+
+static void *iommu_dma_alloc_pool(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
+{
+ bool coherent = dev_is_dma_coherent(dev);
+ struct page *page;
+ void *vaddr;
+
+ vaddr = dma_alloc_from_pool(PAGE_ALIGN(size), &page, gfp);
+ if (!vaddr)
+ return NULL;
+
+ *dma_handle = __iommu_dma_map(dev, page_to_phys(page), size,
+ dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs),
+ iommu_get_domain_for_dev(dev));
+ if (*dma_handle == DMA_MAPPING_ERROR) {
+ dma_free_from_pool(vaddr, PAGE_ALIGN(size));
+ return NULL;
+ }
+
+ return vaddr;
+}
+
static void iommu_dma_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
{
@@ -974,21 +1003,18 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
* 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 (!addr)
+ if (!coherent)
+ return iommu_dma_alloc_pool(dev, iosize, handle, gfp,
+ attrs);
+
+ page = alloc_pages(gfp, get_order(size));
+ if (!page)
return NULL;
+ addr = page_address(page);
*handle = __iommu_dma_map_page(dev, page, 0, iosize, ioprot);
if (*handle == DMA_MAPPING_ERROR) {
- if (coherent)
- __free_pages(page, get_order(size));
- else
- dma_free_from_pool(addr, size);
+ __free_pages(page, get_order(size));
addr = NULL;
}
} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
@@ -1042,8 +1068,7 @@ static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
* Hence how dodgy the below logic looks...
*/
if (dma_in_atomic_pool(cpu_addr, size)) {
- __iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
- dma_free_from_pool(cpu_addr, size);
+ iommu_dma_free_pool(dev, size, cpu_addr, handle);
} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
struct page *page = vmalloc_to_page(cpu_addr);
--
2.20.1
next prev parent reply other threads:[~2019-01-14 9:41 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-14 9:41 implement generic dma_map_ops for IOMMUs Christoph Hellwig
2019-01-14 9:41 ` [PATCH 01/19] dma-mapping: add a Kconfig symbol to indicated arch_dma_prep_coherent presence Christoph Hellwig
2019-02-01 14:22 ` Robin Murphy
2019-02-01 16:12 ` Christoph Hellwig
2019-01-14 9:41 ` [PATCH 02/19] dma-iommu: cleanup dma-iommu.h Christoph Hellwig
2019-02-01 14:47 ` Robin Murphy
2019-02-01 16:13 ` Christoph Hellwig
2019-02-06 15:08 ` Robin Murphy
2019-02-11 15:59 ` Christoph Hellwig
2019-01-14 9:41 ` [PATCH 03/19] dma-iommu: don't use a scatterlist in iommu_dma_alloc Christoph Hellwig
2019-02-01 15:24 ` Robin Murphy
2019-02-01 16:16 ` Christoph Hellwig
2019-02-06 15:28 ` Robin Murphy
2019-02-11 16:00 ` Christoph Hellwig
2019-01-14 9:41 ` [PATCH 04/19] dma-iommu: remove the flush_page callback Christoph Hellwig
2019-02-01 15:28 ` Robin Murphy
2019-01-14 9:41 ` [PATCH 05/19] dma-iommu: move the arm64 wrappers to common code Christoph Hellwig
2019-01-14 9:41 ` [PATCH 06/19] dma-iommu: fix and refactor iommu_dma_mmap Christoph Hellwig
2019-02-05 15:02 ` Robin Murphy
2019-02-11 16:03 ` Christoph Hellwig
2019-01-14 9:41 ` [PATCH 07/19] dma-iommu: fix and refactor iommu_dma_get_sgtable Christoph Hellwig
2019-01-14 9:41 ` [PATCH 08/19] dma-iommu: move __iommu_dma_map Christoph Hellwig
2019-01-14 9:41 ` [PATCH 09/19] dma-iommu: refactor page array remap helpers Christoph Hellwig
2019-01-14 9:41 ` Christoph Hellwig [this message]
2019-01-14 9:41 ` [PATCH 11/19] dma-iommu: factor contiguous allocations into helpers Christoph Hellwig
2019-01-14 9:41 ` [PATCH 12/19] dma-iommu: refactor iommu_dma_free Christoph Hellwig
2019-01-14 9:41 ` [PATCH 13/19] dma-iommu: don't remap contiguous allocations for coherent devices Christoph Hellwig
2019-01-14 9:41 ` [PATCH 14/19] dma-iommu: factor contiguous remapped allocations into helpers Christoph Hellwig
2019-01-14 9:41 ` [PATCH 15/19] dma-iommu: refactor iommu_dma_alloc Christoph Hellwig
2019-01-14 9:41 ` [PATCH 16/19] dma-iommu: don't depend on CONFIG_DMA_DIRECT_REMAP Christoph Hellwig
2019-02-06 11:55 ` Robin Murphy
2019-02-11 16:39 ` Christoph Hellwig
2019-01-14 9:41 ` [PATCH 17/19] dma-iommu: switch copyright boilerplace to SPDX Christoph Hellwig
2019-02-06 11:57 ` Robin Murphy
2019-01-14 9:41 ` [PATCH 18/19] arm64: switch copyright boilerplace to SPDX in dma-mapping.c Christoph Hellwig
2019-02-06 12:19 ` Robin Murphy
2019-01-14 9:41 ` [PATCH 19/19] arm64: trim includes " Christoph Hellwig
2019-01-28 7:53 ` implement generic dma_map_ops for IOMMUs Christoph Hellwig
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