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iommu/intel-iommu: Enable CONFIG_DMA_DIRECT_OPS=y and clean up intel_{alloc,free}_coherent() 

Use the dma_direct_*() helpers and clean up the code flow.

Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Jon Mason <jdmason@kudzu.us>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Muli Ben-Yehuda <mulix@mulix.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: iommu@lists.linux-foundation.org
Link: http://lkml.kernel.org/r/20180319103826.12853-9-hch@lst.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Christoph Hellwig 2018-03-19 11:38:20 +01:00 committed by Ingo Molnar
parent b468620f2a
commit d657c5c73c
2 changed files with 17 additions and 46 deletions
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1
drivers/iommu/Kconfig
View File

@ -143,6 +143,7 @@ config DMAR_TABLE
config INTEL_IOMMU
bool "Support for Intel IOMMU using DMA Remapping Devices"
depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
select DMA_DIRECT_OPS
select IOMMU_API
select IOMMU_IOVA
select DMAR_TABLE

62
drivers/iommu/intel-iommu.c
View File

@ -31,6 +31,7 @@
#include <linux/pci.h>
#include <linux/dmar.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direct.h>
#include <linux/mempool.h>
#include <linux/memory.h>
#include <linux/cpu.h>
@ -3708,61 +3709,30 @@ static void *intel_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
unsigned long attrs)
{
struct page *page = NULL;
int order;
void *vaddr;
size = PAGE_ALIGN(size);
order = get_order(size);
vaddr = dma_direct_alloc(dev, size, dma_handle, flags, attrs);
if (iommu_no_mapping(dev) || !vaddr)
return vaddr;
if (!iommu_no_mapping(dev))
flags &= ~(GFP_DMA | GFP_DMA32);
else if (dev->coherent_dma_mask < dma_get_required_mask(dev)) {
if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
flags |= GFP_DMA;
else
flags |= GFP_DMA32;
}
if (gfpflags_allow_blocking(flags)) {
unsigned int count = size >> PAGE_SHIFT;
page = dma_alloc_from_contiguous(dev, count, order, flags);
if (page && iommu_no_mapping(dev) &&
page_to_phys(page) + size > dev->coherent_dma_mask) {
dma_release_from_contiguous(dev, page, count);
page = NULL;
}
}
if (!page)
page = alloc_pages(flags, order);
if (!page)
return NULL;
memset(page_address(page), 0, size);
*dma_handle = __intel_map_single(dev, page_to_phys(page), size,
DMA_BIDIRECTIONAL,
dev->coherent_dma_mask);
if (*dma_handle)
return page_address(page);
if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
__free_pages(page, order);
*dma_handle = __intel_map_single(dev, virt_to_phys(vaddr),
PAGE_ALIGN(size), DMA_BIDIRECTIONAL,
dev->coherent_dma_mask);
if (!*dma_handle)
goto out_free_pages;
return vaddr;
out_free_pages:
dma_direct_free(dev, size, vaddr, *dma_handle, attrs);
return NULL;
}
static void intel_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
int order;
struct page *page = virt_to_page(vaddr);
size = PAGE_ALIGN(size);
order = get_order(size);
intel_unmap(dev, dma_handle, size);
if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
__free_pages(page, order);
if (!iommu_no_mapping(dev))
intel_unmap(dev, dma_handle, PAGE_ALIGN(size));
dma_direct_free(dev, size, vaddr, dma_handle, attrs);
}
static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist,