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 10/25] iommu/dma: Factor out remapped pages lookup
Date: Tue, 30 Apr 2019 06:51:59 -0400 [thread overview]
Message-ID: <20190430105214.24628-11-hch@lst.de> (raw)
In-Reply-To: <20190430105214.24628-1-hch@lst.de>
From: Robin Murphy <robin.murphy@arm.com>
Since we duplicate the find_vm_area() logic a few times in places where
we only care aboute the pages, factor out a helper to abstract it.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[hch: don't warn when not finding a region, as we'll rely on that later]
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/iommu/dma-iommu.c | 32 ++++++++++++++++++++------------
1 file changed, 20 insertions(+), 12 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 82fb208017fb..84fe9a9eb0bb 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -525,6 +525,15 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
return pages;
}
+static struct page **__iommu_dma_get_pages(void *cpu_addr)
+{
+ struct vm_struct *area = find_vm_area(cpu_addr);
+
+ if (!area || !area->pages)
+ return NULL;
+ return area->pages;
+}
+
/**
* iommu_dma_free - Free a buffer allocated by __iommu_dma_alloc()
* @dev: Device which owns this buffer
@@ -1023,11 +1032,11 @@ static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT);
dma_common_free_remap(cpu_addr, size, VM_USERMAP);
} else if (is_vmalloc_addr(cpu_addr)){
- struct vm_struct *area = find_vm_area(cpu_addr);
+ struct page **pages = __iommu_dma_get_pages(cpu_addr);
- if (WARN_ON(!area || !area->pages))
+ if (!pages)
return;
- __iommu_dma_free(dev, area->pages, iosize, &handle);
+ __iommu_dma_free(dev, pages, iosize, &handle);
dma_common_free_remap(cpu_addr, size, VM_USERMAP);
} else {
__iommu_dma_unmap(dev, handle, iosize);
@@ -1059,7 +1068,7 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
{
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
- struct vm_struct *area;
+ struct page **pages;
int ret;
vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs);
@@ -1084,11 +1093,10 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
return __iommu_dma_mmap_pfn(vma, pfn, size);
}
- area = find_vm_area(cpu_addr);
- if (WARN_ON(!area || !area->pages))
+ pages = __iommu_dma_get_pages(cpu_addr);
+ if (!pages)
return -ENXIO;
-
- return __iommu_dma_mmap(area->pages, size, vma);
+ return __iommu_dma_mmap(pages, size, vma);
}
static int __iommu_dma_get_sgtable_page(struct sg_table *sgt, struct page *page,
@@ -1106,7 +1114,7 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
unsigned long attrs)
{
unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- struct vm_struct *area = find_vm_area(cpu_addr);
+ struct page **pages;
if (!is_vmalloc_addr(cpu_addr)) {
struct page *page = virt_to_page(cpu_addr);
@@ -1122,10 +1130,10 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
return __iommu_dma_get_sgtable_page(sgt, page, size);
}
- if (WARN_ON(!area || !area->pages))
+ pages = __iommu_dma_get_pages(cpu_addr);
+ if (!pages)
return -ENXIO;
-
- return sg_alloc_table_from_pages(sgt, area->pages, count, 0, size,
+ return sg_alloc_table_from_pages(sgt, pages, count, 0, size,
GFP_KERNEL);
}
--
2.20.1
next prev parent reply other threads:[~2019-04-30 10:54 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 10:51 implement generic dma_map_ops for IOMMUs v4 Christoph Hellwig
2019-04-30 10:51 ` [PATCH 01/25] arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable Christoph Hellwig
2019-05-03 11:33 ` Catalin Marinas
2019-05-07 6:37 ` Christoph Hellwig
2019-05-07 9:05 ` Will Deacon
2019-04-30 10:51 ` [PATCH 02/25] dma-mapping: add a Kconfig symbol to indicated arch_dma_prep_coherent presence Christoph Hellwig
2019-05-03 11:36 ` Catalin Marinas
2019-04-30 10:51 ` [PATCH 03/25] iommu/dma: Cleanup dma-iommu.h Christoph Hellwig
2019-04-30 10:51 ` [PATCH 04/25] iommu/dma: Remove the flush_page callback Christoph Hellwig
2019-05-03 11:43 ` Catalin Marinas
2019-05-03 11:44 ` Catalin Marinas
2019-04-30 10:51 ` [PATCH 05/25] iommu/dma: Use for_each_sg in iommu_dma_alloc Christoph Hellwig
2019-04-30 10:51 ` [PATCH 06/25] iommu/dma: move the arm64 wrappers to common code Christoph Hellwig
2019-05-03 11:45 ` Catalin Marinas
2019-04-30 10:51 ` [PATCH 07/25] iommu/dma: Move __iommu_dma_map Christoph Hellwig
2019-04-30 10:51 ` [PATCH 08/25] iommu/dma: Move domain lookup into __iommu_dma_{map,unmap} Christoph Hellwig
2019-04-30 10:51 ` [PATCH 09/25] iommu/dma: Squash __iommu_dma_{map,unmap}_page helpers Christoph Hellwig
2019-04-30 10:51 ` Christoph Hellwig [this message]
2019-04-30 10:52 ` [PATCH 11/25] iommu/dma: Refactor the page array remapping allocator Christoph Hellwig
2019-04-30 10:52 ` [PATCH 12/25] iommu/dma: Remove __iommu_dma_free Christoph Hellwig
2019-04-30 10:52 ` [PATCH 13/25] iommu/dma: Refactor iommu_dma_free Christoph Hellwig
2019-04-30 10:52 ` [PATCH 14/25] iommu/dma: Refactor iommu_dma_alloc Christoph Hellwig
2019-04-30 10:52 ` [PATCH 15/25] iommu/dma: Don't remap CMA unnecessarily Christoph Hellwig
2019-04-30 10:52 ` [PATCH 16/25] iommu/dma: Merge the CMA and alloc_pages allocation paths Christoph Hellwig
2019-04-30 10:52 ` [PATCH 17/25] iommu/dma: Split iommu_dma_free Christoph Hellwig
2019-04-30 10:52 ` [PATCH 18/25] iommu/dma: Cleanup variable naming in iommu_dma_alloc Christoph Hellwig
2019-04-30 10:52 ` [PATCH 19/25] iommu/dma: Refactor iommu_dma_alloc, part 2 Christoph Hellwig
2019-04-30 10:52 ` [PATCH 20/25] iommu/dma: Refactor iommu_dma_get_sgtable Christoph Hellwig
2019-04-30 10:52 ` [PATCH 21/25] iommu/dma: Refactor iommu_dma_mmap Christoph Hellwig
2019-04-30 10:52 ` [PATCH 22/25] iommu/dma: Don't depend on CONFIG_DMA_DIRECT_REMAP Christoph Hellwig
2019-04-30 10:52 ` [PATCH 23/25] iommu/dma: Switch copyright boilerplace to SPDX Christoph Hellwig
2019-04-30 10:52 ` [PATCH 24/25] arm64: switch copyright boilerplace to SPDX in dma-mapping.c Christoph Hellwig
2019-05-03 11:45 ` Catalin Marinas
2019-04-30 10:52 ` [PATCH 25/25] arm64: trim includes " Christoph Hellwig
2019-05-03 11:46 ` Catalin Marinas
2019-05-02 13:22 ` implement generic dma_map_ops for IOMMUs v4 Christoph Hellwig
2019-05-03 11:47 ` Catalin Marinas
2019-05-03 11:59 ` Christoph Hellwig
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