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-rw-r--r--drivers/media/v4l2-core/videobuf-dma-contig.c130
1 files changed, 14 insertions, 116 deletions
diff --git a/drivers/media/v4l2-core/videobuf-dma-contig.c b/drivers/media/v4l2-core/videobuf-dma-contig.c
index 3a43ba0959bf..67f572c3fba2 100644
--- a/drivers/media/v4l2-core/videobuf-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf-dma-contig.c
@@ -27,7 +27,6 @@ struct videobuf_dma_contig_memory {
u32 magic;
void *vaddr;
dma_addr_t dma_handle;
- bool cached;
unsigned long size;
};
@@ -43,26 +42,8 @@ static int __videobuf_dc_alloc(struct device *dev,
unsigned long size, gfp_t flags)
{
mem->size = size;
- if (mem->cached) {
- mem->vaddr = alloc_pages_exact(mem->size, flags | GFP_DMA);
- if (mem->vaddr) {
- int err;
-
- mem->dma_handle = dma_map_single(dev, mem->vaddr,
- mem->size,
- DMA_FROM_DEVICE);
- err = dma_mapping_error(dev, mem->dma_handle);
- if (err) {
- dev_err(dev, "dma_map_single failed\n");
-
- free_pages_exact(mem->vaddr, mem->size);
- mem->vaddr = NULL;
- return err;
- }
- }
- } else
- mem->vaddr = dma_alloc_coherent(dev, mem->size,
- &mem->dma_handle, flags);
+ mem->vaddr = dma_alloc_coherent(dev, mem->size,
+ &mem->dma_handle, flags);
if (!mem->vaddr) {
dev_err(dev, "memory alloc size %ld failed\n", mem->size);
@@ -77,14 +58,7 @@ static int __videobuf_dc_alloc(struct device *dev,
static void __videobuf_dc_free(struct device *dev,
struct videobuf_dma_contig_memory *mem)
{
- if (mem->cached) {
- if (!mem->vaddr)
- return;
- dma_unmap_single(dev, mem->dma_handle, mem->size,
- DMA_FROM_DEVICE);
- free_pages_exact(mem->vaddr, mem->size);
- } else
- dma_free_coherent(dev, mem->size, mem->vaddr, mem->dma_handle);
+ dma_free_coherent(dev, mem->size, mem->vaddr, mem->dma_handle);
mem->vaddr = NULL;
}
@@ -234,7 +208,7 @@ out_up:
return ret;
}
-static struct videobuf_buffer *__videobuf_alloc_vb(size_t size, bool cached)
+static struct videobuf_buffer *__videobuf_alloc(size_t size)
{
struct videobuf_dma_contig_memory *mem;
struct videobuf_buffer *vb;
@@ -244,22 +218,11 @@ static struct videobuf_buffer *__videobuf_alloc_vb(size_t size, bool cached)
vb->priv = ((char *)vb) + size;
mem = vb->priv;
mem->magic = MAGIC_DC_MEM;
- mem->cached = cached;
}
return vb;
}
-static struct videobuf_buffer *__videobuf_alloc_uncached(size_t size)
-{
- return __videobuf_alloc_vb(size, false);
-}
-
-static struct videobuf_buffer *__videobuf_alloc_cached(size_t size)
-{
- return __videobuf_alloc_vb(size, true);
-}
-
static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
{
struct videobuf_dma_contig_memory *mem = buf->priv;
@@ -310,19 +273,6 @@ static int __videobuf_iolock(struct videobuf_queue *q,
return 0;
}
-static int __videobuf_sync(struct videobuf_queue *q,
- struct videobuf_buffer *buf)
-{
- struct videobuf_dma_contig_memory *mem = buf->priv;
- BUG_ON(!mem);
- MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
-
- dma_sync_single_for_cpu(q->dev, mem->dma_handle, mem->size,
- DMA_FROM_DEVICE);
-
- return 0;
-}
-
static int __videobuf_mmap_mapper(struct videobuf_queue *q,
struct videobuf_buffer *buf,
struct vm_area_struct *vma)
@@ -331,8 +281,6 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
struct videobuf_mapping *map;
int retval;
unsigned long size;
- unsigned long pos, start = vma->vm_start;
- struct page *page;
dev_dbg(q->dev, "%s\n", __func__);
@@ -359,43 +307,16 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
size = vma->vm_end - vma->vm_start;
size = (size < mem->size) ? size : mem->size;
- if (!mem->cached) {
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
- retval = remap_pfn_range(vma, vma->vm_start,
- mem->dma_handle >> PAGE_SHIFT,
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ retval = remap_pfn_range(vma, vma->vm_start,
+ mem->dma_handle >> PAGE_SHIFT,
size, vma->vm_page_prot);
- if (retval) {
- dev_err(q->dev, "mmap: remap failed with error %d. ",
- retval);
- dma_free_coherent(q->dev, mem->size,
- mem->vaddr, mem->dma_handle);
- goto error;
- }
- } else {
- pos = (unsigned long)mem->vaddr;
-
- while (size > 0) {
- page = virt_to_page((void *)pos);
- if (NULL == page) {
- dev_err(q->dev, "mmap: virt_to_page failed\n");
- __videobuf_dc_free(q->dev, mem);
- goto error;
- }
- retval = vm_insert_page(vma, start, page);
- if (retval) {
- dev_err(q->dev, "mmap: insert failed with error %d\n",
- retval);
- __videobuf_dc_free(q->dev, mem);
- goto error;
- }
- start += PAGE_SIZE;
- pos += PAGE_SIZE;
-
- if (size > PAGE_SIZE)
- size -= PAGE_SIZE;
- else
- size = 0;
- }
+ if (retval) {
+ dev_err(q->dev, "mmap: remap failed with error %d. ",
+ retval);
+ dma_free_coherent(q->dev, mem->size,
+ mem->vaddr, mem->dma_handle);
+ goto error;
}
vma->vm_ops = &videobuf_vm_ops;
@@ -417,17 +338,8 @@ error:
static struct videobuf_qtype_ops qops = {
.magic = MAGIC_QTYPE_OPS,
- .alloc_vb = __videobuf_alloc_uncached,
- .iolock = __videobuf_iolock,
- .mmap_mapper = __videobuf_mmap_mapper,
- .vaddr = __videobuf_to_vaddr,
-};
-
-static struct videobuf_qtype_ops qops_cached = {
- .magic = MAGIC_QTYPE_OPS,
- .alloc_vb = __videobuf_alloc_cached,
+ .alloc_vb = __videobuf_alloc,
.iolock = __videobuf_iolock,
- .sync = __videobuf_sync,
.mmap_mapper = __videobuf_mmap_mapper,
.vaddr = __videobuf_to_vaddr,
};
@@ -447,20 +359,6 @@ void videobuf_queue_dma_contig_init(struct videobuf_queue *q,
}
EXPORT_SYMBOL_GPL(videobuf_queue_dma_contig_init);
-void videobuf_queue_dma_contig_init_cached(struct videobuf_queue *q,
- const struct videobuf_queue_ops *ops,
- struct device *dev,
- spinlock_t *irqlock,
- enum v4l2_buf_type type,
- enum v4l2_field field,
- unsigned int msize,
- void *priv, struct mutex *ext_lock)
-{
- videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
- priv, &qops_cached, ext_lock);
-}
-EXPORT_SYMBOL_GPL(videobuf_queue_dma_contig_init_cached);
-
dma_addr_t videobuf_to_dma_contig(struct videobuf_buffer *buf)
{
struct videobuf_dma_contig_memory *mem = buf->priv;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 02:45:18 +0000