From: Souptick Joarder <jrdr.linux@gmail.com>
To: akpm@linux-foundation.org, willy@infradead.org, mhocko@suse.com,
linux@armlinux.org.uk, robin.murphy@arm.com,
iamjoonsoo.kim@lge.com, treding@nvidia.com,
keescook@chromium.org, m.szyprowski@samsung.com
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 2/9] arm: mm: dma-mapping: Convert to use vm_map_pages()
Date: Fri, 15 Feb 2019 08:13:29 +0530 [thread overview]
Message-ID: <20190215024329.GA26372@jordon-HP-15-Notebook-PC> (raw)
Convert to use vm_map_pages() to map range of kernel
memory to user vma.
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
---
arch/arm/mm/dma-mapping.c | 22 ++++++----------------
1 file changed, 6 insertions(+), 16 deletions(-)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index f1e2922..de7c76e 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1575,31 +1575,21 @@ static int __arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
- unsigned long uaddr = vma->vm_start;
- unsigned long usize = vma->vm_end - vma->vm_start;
struct page **pages = __iommu_get_pages(cpu_addr, attrs);
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- unsigned long off = vma->vm_pgoff;
+ int err;
if (!pages)
return -ENXIO;
- if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
+ if (vma->vm_pgoff >= nr_pages)
return -ENXIO;
- pages += off;
-
- do {
- int ret = vm_insert_page(vma, uaddr, *pages++);
- if (ret) {
- pr_err("Remapping memory failed: %d\n", ret);
- return ret;
- }
- uaddr += PAGE_SIZE;
- usize -= PAGE_SIZE;
- } while (usize > 0);
+ err = vm_map_pages(vma, pages, nr_pages);
+ if (err)
+ pr_err("Remapping memory failed: %d\n", err);
- return 0;
+ return err;
}
static int arm_iommu_mmap_attrs(struct device *dev,
struct vm_area_struct *vma, void *cpu_addr,
--
1.9.1
reply other threads:[~2019-02-15 2:39 UTC|newest]
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