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 18/21] dma-iommu: don't depend on CONFIG_DMA_DIRECT_REMAP
Date: Wed, 13 Feb 2019 19:29:17 +0100 [thread overview]
Message-ID: <20190213182920.16764-19-hch@lst.de> (raw)
In-Reply-To: <20190213182920.16764-1-hch@lst.de>
For entirely dma coherent architectures there is no requirement to ever
remap dma coherent allocation. Move all the remap and pool code under
CONFIG_DMA_DIRECT_REMAP ifdefs, and drop the Kconfig dependency.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/iommu/Kconfig | 1 -
drivers/iommu/dma-iommu.c | 10 ++++++++++
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 8b13fb7d0263..d9a25715650e 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -94,7 +94,6 @@ config IOMMU_DMA
select IOMMU_API
select IOMMU_IOVA
select NEED_SG_DMA_LENGTH
- depends on DMA_DIRECT_REMAP
config FSL_PAMU
bool "Freescale IOMMU support"
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 5f3c70c65d50..35a5c219b82e 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -501,6 +501,7 @@ static void *iommu_dma_alloc_contiguous(struct device *dev, size_t size,
return page_address(page);
}
+#ifdef CONFIG_DMA_DIRECT_REMAP
static void __iommu_dma_free_pages(struct page **pages, int count)
{
while (count--)
@@ -783,6 +784,7 @@ static void *iommu_dma_alloc_noncoherent(struct device *dev, size_t size,
gfp, attrs);
return iommu_dma_alloc_remap(dev, size, dma_handle, gfp, attrs);
}
+#endif /* CONFIG_DMA_DIRECT_REMAP */
static void iommu_dma_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
@@ -1065,6 +1067,7 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
*/
gfp |= __GFP_ZERO;
+#ifdef CONFIG_DMA_DIRECT_REMAP
if (!dev_is_dma_coherent(dev))
return iommu_dma_alloc_noncoherent(dev, size, dma_handle, gfp,
attrs);
@@ -1072,6 +1075,7 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
if (gfpflags_allow_blocking(gfp) &&
!(attrs & DMA_ATTR_FORCE_CONTIGUOUS))
return iommu_dma_alloc_remap(dev, size, dma_handle, gfp, attrs);
+#endif
return iommu_dma_alloc_contiguous(dev, size, dma_handle, gfp, attrs);
}
@@ -1091,6 +1095,7 @@ static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
*
* Hence how dodgy the below logic looks...
*/
+#ifdef CONFIG_DMA_DIRECT_REMAP
if (dma_in_atomic_pool(cpu_addr, PAGE_ALIGN(size))) {
iommu_dma_free_pool(dev, size, cpu_addr, dma_handle);
return;
@@ -1104,6 +1109,7 @@ static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
page = vmalloc_to_page(cpu_addr);
dma_common_free_remap(cpu_addr, PAGE_ALIGN(size), VM_USERMAP);
} else
+#endif
page = virt_to_page(cpu_addr);
iommu_dma_free_contiguous(dev, size, page, dma_handle);
@@ -1126,11 +1132,13 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
if (off >= nr_pages || vma_pages(vma) > nr_pages - off)
return -ENXIO;
+#ifdef CONFIG_DMA_DIRECT_REMAP
if (is_vmalloc_addr(cpu_addr)) {
if (!(attrs & DMA_ATTR_FORCE_CONTIGUOUS))
return iommu_dma_mmap_remap(cpu_addr, size, vma);
pfn = vmalloc_to_pfn(cpu_addr);
} else
+#endif
pfn = page_to_pfn(virt_to_page(cpu_addr));
return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
@@ -1144,11 +1152,13 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
struct page *page;
int ret;
+#ifdef CONFIG_DMA_DIRECT_REMAP
if (is_vmalloc_addr(cpu_addr)) {
if (!(attrs & DMA_ATTR_FORCE_CONTIGUOUS))
return iommu_dma_get_sgtable_remap(sgt, cpu_addr, size);
page = vmalloc_to_page(cpu_addr);
} else
+#endif
page = virt_to_page(cpu_addr);
ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
--
2.20.1
next prev parent reply other threads:[~2019-02-13 18:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-13 18:28 implement generic dma_map_ops for IOMMUs v2 Christoph Hellwig
2019-02-13 18:29 ` [PATCH 01/21] arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable Christoph Hellwig
2019-02-13 18:29 ` [PATCH 02/21] arm64/iommu: improve mmap bounds checking Christoph Hellwig
2019-02-13 18:29 ` [PATCH 03/21] dma-mapping: add a Kconfig symbol to indicated arch_dma_prep_coherent presence Christoph Hellwig
2019-02-13 18:29 ` [PATCH 04/21] dma-iommu: cleanup dma-iommu.h Christoph Hellwig
2019-02-13 18:29 ` [PATCH 05/21] dma-iommu: remove the flush_page callback Christoph Hellwig
2019-02-13 18:29 ` [PATCH 06/21] dma-iommu: use for_each_sg in iommu_dma_alloc Christoph Hellwig
2019-02-13 18:29 ` [PATCH 07/21] dma-iommu: move the arm64 wrappers to common code Christoph Hellwig
2019-02-13 18:29 ` [PATCH 08/21] dma-iommu: refactor iommu_dma_mmap Christoph Hellwig
2019-02-13 18:29 ` [PATCH 09/21] dma-iommu: refactor iommu_dma_get_sgtable Christoph Hellwig
2019-02-13 18:29 ` [PATCH 10/21] dma-iommu: move __iommu_dma_map Christoph Hellwig
2019-02-13 18:29 ` [PATCH 11/21] dma-iommu: refactor page array remap helpers Christoph Hellwig
2019-02-13 18:29 ` [PATCH 12/21] dma-iommu: factor atomic pool allocations into helpers Christoph Hellwig
2019-02-13 18:29 ` [PATCH 13/21] dma-iommu: factor contiguous " Christoph Hellwig
2019-02-13 18:29 ` [PATCH 14/21] dma-iommu: refactor iommu_dma_free Christoph Hellwig
2019-02-13 18:29 ` [PATCH 15/21] dma-iommu: don't remap contiguous allocations for coherent devices Christoph Hellwig
2019-02-13 18:29 ` [PATCH 16/21] dma-iommu: factor contiguous remapped allocations into helpers Christoph Hellwig
2019-02-13 18:29 ` [PATCH 17/21] dma-iommu: refactor iommu_dma_alloc Christoph Hellwig
2019-02-13 18:29 ` Christoph Hellwig [this message]
2019-02-13 18:29 ` [PATCH 19/21] dma-iommu: switch copyright boilerplace to SPDX Christoph Hellwig
2019-02-13 18:29 ` [PATCH 20/21] arm64: switch copyright boilerplace to SPDX in dma-mapping.c Christoph Hellwig
2019-02-13 18:29 ` [PATCH 21/21] arm64: trim includes " Christoph Hellwig
2019-03-27 8:04 implement generic dma_map_ops for IOMMUs v2 [rebase + resend] Christoph Hellwig
2019-03-27 8:04 ` [PATCH 18/21] dma-iommu: don't depend on CONFIG_DMA_DIRECT_REMAP Christoph Hellwig
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