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authorLinus Torvalds <torvalds@linux-foundation.org>2021-05-04 10:52:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-05-04 10:52:09 -0700
commit954b7207059cc4004f2e18f49c335304b1c6d64a (patch)
tree8dc4347cead2d2eb247e198c9c50823ba7c4ea01 /kernel
parent51e6f07cb12e50bfc71181bd08bad5f0a9b5e9e2 (diff)
parenta7f3d3d3600c8ed119eb0d2483de0062ce2e3707 (diff)
downloadlinux-954b7207059cc4004f2e18f49c335304b1c6d64a.tar.bz2
Merge tag 'dma-mapping-5.13' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping updates from Christoph Hellwig: - add a new dma_alloc_noncontiguous API (me, Ricardo Ribalda) - fix a copyright notice (Hao Fang) - add an unlikely annotation to dma_mapping_error (Heiner Kallweit) - remove a pointless empty line (Wang Qing) - add support for multi-pages map/unmap bencharking (Xiang Chen) * tag 'dma-mapping-5.13' of git://git.infradead.org/users/hch/dma-mapping: dma-mapping: add unlikely hint to error path in dma_mapping_error dma-mapping: benchmark: Add support for multi-pages map/unmap dma-mapping: benchmark: use the correct HiSilicon copyright dma-mapping: remove a pointless empty line in dma_alloc_coherent media: uvcvideo: Use dma_alloc_noncontiguous API dma-iommu: implement ->alloc_noncontiguous dma-iommu: refactor iommu_dma_alloc_remap dma-mapping: add a dma_alloc_noncontiguous API dma-mapping: refactor dma_{alloc,free}_pages dma-mapping: add a dma_mmap_pages helper
Diffstat (limited to 'kernel')
-rw-r--r--kernel/dma/map_benchmark.c23
-rw-r--r--kernel/dma/mapping.c148
2 files changed, 153 insertions, 18 deletions
diff --git a/kernel/dma/map_benchmark.c b/kernel/dma/map_benchmark.c
index e0e64f8b0739..9b9af1bd6be3 100644
--- a/kernel/dma/map_benchmark.c
+++ b/kernel/dma/map_benchmark.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Copyright (C) 2020 Hisilicon Limited.
+ * Copyright (C) 2020 HiSilicon Limited.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -38,7 +38,8 @@ struct map_benchmark {
__u32 dma_bits; /* DMA addressing capability */
__u32 dma_dir; /* DMA data direction */
__u32 dma_trans_ns; /* time for DMA transmission in ns */
- __u8 expansion[80]; /* For future use */
+ __u32 granule; /* how many PAGE_SIZE will do map/unmap once a time */
+ __u8 expansion[76]; /* For future use */
};
struct map_benchmark_data {
@@ -58,9 +59,11 @@ static int map_benchmark_thread(void *data)
void *buf;
dma_addr_t dma_addr;
struct map_benchmark_data *map = data;
+ int npages = map->bparam.granule;
+ u64 size = npages * PAGE_SIZE;
int ret = 0;
- buf = (void *)__get_free_page(GFP_KERNEL);
+ buf = alloc_pages_exact(size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
@@ -76,10 +79,10 @@ static int map_benchmark_thread(void *data)
* 66 means evertything goes well! 66 is lucky.
*/
if (map->dir != DMA_FROM_DEVICE)
- memset(buf, 0x66, PAGE_SIZE);
+ memset(buf, 0x66, size);
map_stime = ktime_get();
- dma_addr = dma_map_single(map->dev, buf, PAGE_SIZE, map->dir);
+ dma_addr = dma_map_single(map->dev, buf, size, map->dir);
if (unlikely(dma_mapping_error(map->dev, dma_addr))) {
pr_err("dma_map_single failed on %s\n",
dev_name(map->dev));
@@ -93,7 +96,7 @@ static int map_benchmark_thread(void *data)
ndelay(map->bparam.dma_trans_ns);
unmap_stime = ktime_get();
- dma_unmap_single(map->dev, dma_addr, PAGE_SIZE, map->dir);
+ dma_unmap_single(map->dev, dma_addr, size, map->dir);
unmap_etime = ktime_get();
unmap_delta = ktime_sub(unmap_etime, unmap_stime);
@@ -112,7 +115,7 @@ static int map_benchmark_thread(void *data)
}
out:
- free_page((unsigned long)buf);
+ free_pages_exact(buf, size);
return ret;
}
@@ -203,7 +206,6 @@ static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
struct map_benchmark_data *map = file->private_data;
void __user *argp = (void __user *)arg;
u64 old_dma_mask;
-
int ret;
if (copy_from_user(&map->bparam, argp, sizeof(map->bparam)))
@@ -234,6 +236,11 @@ static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
return -EINVAL;
}
+ if (map->bparam.granule < 1 || map->bparam.granule > 1024) {
+ pr_err("invalid granule size\n");
+ return -EINVAL;
+ }
+
switch (map->bparam.dma_dir) {
case DMA_MAP_BIDIRECTIONAL:
map->dir = DMA_BIDIRECTIONAL;
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index b6a633679933..2b06a809d0b9 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -477,11 +477,10 @@ void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
}
EXPORT_SYMBOL(dma_free_attrs);
-struct page *dma_alloc_pages(struct device *dev, size_t size,
+static struct page *__dma_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
- struct page *page;
if (WARN_ON_ONCE(!dev->coherent_dma_mask))
return NULL;
@@ -490,33 +489,162 @@ struct page *dma_alloc_pages(struct device *dev, size_t size,
size = PAGE_ALIGN(size);
if (dma_alloc_direct(dev, ops))
- page = dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp);
- else if (ops->alloc_pages)
- page = ops->alloc_pages(dev, size, dma_handle, dir, gfp);
- else
+ return dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp);
+ if (!ops->alloc_pages)
return NULL;
+ return ops->alloc_pages(dev, size, dma_handle, dir, gfp);
+}
- debug_dma_map_page(dev, page, 0, size, dir, *dma_handle);
+struct page *dma_alloc_pages(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
+{
+ struct page *page = __dma_alloc_pages(dev, size, dma_handle, dir, gfp);
+ if (page)
+ debug_dma_map_page(dev, page, 0, size, dir, *dma_handle);
return page;
}
EXPORT_SYMBOL_GPL(dma_alloc_pages);
-void dma_free_pages(struct device *dev, size_t size, struct page *page,
+static void __dma_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
size = PAGE_ALIGN(size);
- debug_dma_unmap_page(dev, dma_handle, size, dir);
-
if (dma_alloc_direct(dev, ops))
dma_direct_free_pages(dev, size, page, dma_handle, dir);
else if (ops->free_pages)
ops->free_pages(dev, size, page, dma_handle, dir);
}
+
+void dma_free_pages(struct device *dev, size_t size, struct page *page,
+ dma_addr_t dma_handle, enum dma_data_direction dir)
+{
+ debug_dma_unmap_page(dev, dma_handle, size, dir);
+ __dma_free_pages(dev, size, page, dma_handle, dir);
+}
EXPORT_SYMBOL_GPL(dma_free_pages);
+int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
+ size_t size, struct page *page)
+{
+ unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+ if (vma->vm_pgoff >= count || vma_pages(vma) > count - vma->vm_pgoff)
+ return -ENXIO;
+ return remap_pfn_range(vma, vma->vm_start,
+ page_to_pfn(page) + vma->vm_pgoff,
+ vma_pages(vma) << PAGE_SHIFT, vma->vm_page_prot);
+}
+EXPORT_SYMBOL_GPL(dma_mmap_pages);
+
+static struct sg_table *alloc_single_sgt(struct device *dev, size_t size,
+ enum dma_data_direction dir, gfp_t gfp)
+{
+ struct sg_table *sgt;
+ struct page *page;
+
+ sgt = kmalloc(sizeof(*sgt), gfp);
+ if (!sgt)
+ return NULL;
+ if (sg_alloc_table(sgt, 1, gfp))
+ goto out_free_sgt;
+ page = __dma_alloc_pages(dev, size, &sgt->sgl->dma_address, dir, gfp);
+ if (!page)
+ goto out_free_table;
+ sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
+ sg_dma_len(sgt->sgl) = sgt->sgl->length;
+ return sgt;
+out_free_table:
+ sg_free_table(sgt);
+out_free_sgt:
+ kfree(sgt);
+ return NULL;
+}
+
+struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
+ enum dma_data_direction dir, gfp_t gfp, unsigned long attrs)
+{
+ const struct dma_map_ops *ops = get_dma_ops(dev);
+ struct sg_table *sgt;
+
+ if (WARN_ON_ONCE(attrs & ~DMA_ATTR_ALLOC_SINGLE_PAGES))
+ return NULL;
+
+ if (ops && ops->alloc_noncontiguous)
+ sgt = ops->alloc_noncontiguous(dev, size, dir, gfp, attrs);
+ else
+ sgt = alloc_single_sgt(dev, size, dir, gfp);
+
+ if (sgt) {
+ sgt->nents = 1;
+ debug_dma_map_sg(dev, sgt->sgl, sgt->orig_nents, 1, dir);
+ }
+ return sgt;
+}
+EXPORT_SYMBOL_GPL(dma_alloc_noncontiguous);
+
+static void free_single_sgt(struct device *dev, size_t size,
+ struct sg_table *sgt, enum dma_data_direction dir)
+{
+ __dma_free_pages(dev, size, sg_page(sgt->sgl), sgt->sgl->dma_address,
+ dir);
+ sg_free_table(sgt);
+ kfree(sgt);
+}
+
+void dma_free_noncontiguous(struct device *dev, size_t size,
+ struct sg_table *sgt, enum dma_data_direction dir)
+{
+ const struct dma_map_ops *ops = get_dma_ops(dev);
+
+ debug_dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir);
+ if (ops && ops->free_noncontiguous)
+ ops->free_noncontiguous(dev, size, sgt, dir);
+ else
+ free_single_sgt(dev, size, sgt, dir);
+}
+EXPORT_SYMBOL_GPL(dma_free_noncontiguous);
+
+void *dma_vmap_noncontiguous(struct device *dev, size_t size,
+ struct sg_table *sgt)
+{
+ const struct dma_map_ops *ops = get_dma_ops(dev);
+ unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+ if (ops && ops->alloc_noncontiguous)
+ return vmap(sgt_handle(sgt)->pages, count, VM_MAP, PAGE_KERNEL);
+ return page_address(sg_page(sgt->sgl));
+}
+EXPORT_SYMBOL_GPL(dma_vmap_noncontiguous);
+
+void dma_vunmap_noncontiguous(struct device *dev, void *vaddr)
+{
+ const struct dma_map_ops *ops = get_dma_ops(dev);
+
+ if (ops && ops->alloc_noncontiguous)
+ vunmap(vaddr);
+}
+EXPORT_SYMBOL_GPL(dma_vunmap_noncontiguous);
+
+int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
+ size_t size, struct sg_table *sgt)
+{
+ const struct dma_map_ops *ops = get_dma_ops(dev);
+
+ if (ops && ops->alloc_noncontiguous) {
+ unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+ if (vma->vm_pgoff >= count ||
+ vma_pages(vma) > count - vma->vm_pgoff)
+ return -ENXIO;
+ return vm_map_pages(vma, sgt_handle(sgt)->pages, count);
+ }
+ return dma_mmap_pages(dev, vma, size, sg_page(sgt->sgl));
+}
+EXPORT_SYMBOL_GPL(dma_mmap_noncontiguous);
+
int dma_supported(struct device *dev, u64 mask)
{
const struct dma_map_ops *ops = get_dma_ops(dev);