From: Colin Cross Date: Sat, 14 Dec 2013 03:26:30 +0000 (-0800) Subject: ion: add helper to zero contiguous region of pages X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=df6cf5c8af54e3e89643511272f6f5f5cfb71a7d;p=openwrt%2Fstaging%2Fblogic.git ion: add helper to zero contiguous region of pages Add ion_heap_pages_zero for ion heaps to use to zero pages during initialization or allocation, when a struct ion_buffer may not be available. Use it from the chunk heap and carveout heaps. Signed-off-by: Colin Cross Signed-off-by: John Stultz Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/android/ion/ion_carveout_heap.c b/drivers/staging/android/ion/ion_carveout_heap.c index 66dec4ca5bea..3cb05b9b0e93 100644 --- a/drivers/staging/android/ion/ion_carveout_heap.c +++ b/drivers/staging/android/ion/ion_carveout_heap.c @@ -150,6 +150,19 @@ static struct ion_heap_ops carveout_heap_ops = { struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data) { struct ion_carveout_heap *carveout_heap; + int ret; + + struct page *page; + size_t size; + + page = pfn_to_page(PFN_DOWN(heap_data->base)); + size = heap_data->size; + + ion_pages_sync_for_device(NULL, page, size, DMA_BIDIRECTIONAL); + + ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL)); + if (ret) + return ERR_PTR(ret); carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL); if (!carveout_heap) diff --git a/drivers/staging/android/ion/ion_chunk_heap.c b/drivers/staging/android/ion/ion_chunk_heap.c index 46e8a3bf7a2f..f21530f4f7ae 100644 --- a/drivers/staging/android/ion/ion_chunk_heap.c +++ b/drivers/staging/android/ion/ion_chunk_heap.c @@ -140,9 +140,18 @@ static struct ion_heap_ops chunk_heap_ops = { struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data) { struct ion_chunk_heap *chunk_heap; - struct vm_struct *vm_struct; - pgprot_t pgprot = pgprot_writecombine(PAGE_KERNEL); - int i, ret; + int ret; + struct page *page; + size_t size; + + page = pfn_to_page(PFN_DOWN(heap_data->base)); + size = heap_data->size; + + ion_pages_sync_for_device(NULL, page, size, DMA_BIDIRECTIONAL); + + ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL)); + if (ret) + return ERR_PTR(ret); chunk_heap = kzalloc(sizeof(struct ion_chunk_heap), GFP_KERNEL); if (!chunk_heap) @@ -159,26 +168,6 @@ struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data) chunk_heap->size = heap_data->size; chunk_heap->allocated = 0; - vm_struct = get_vm_area(PAGE_SIZE, VM_ALLOC); - if (!vm_struct) { - ret = -ENOMEM; - goto error; - } - for (i = 0; i < chunk_heap->size; i += PAGE_SIZE) { - struct page *page = pfn_to_page(PFN_DOWN(chunk_heap->base + i)); - struct page **pages = &page; - - ret = map_vm_area(vm_struct, pgprot, &pages); - if (ret) - goto error_map_vm_area; - memset(vm_struct->addr, 0, PAGE_SIZE); - unmap_kernel_range((unsigned long)vm_struct->addr, PAGE_SIZE); - } - free_vm_area(vm_struct); - - ion_pages_sync_for_device(NULL, pfn_to_page(PFN_DOWN(heap_data->base)), - heap_data->size, DMA_BIDIRECTIONAL); - gen_pool_add(chunk_heap->pool, chunk_heap->base, heap_data->size, -1); chunk_heap->heap.ops = &chunk_heap_ops; chunk_heap->heap.type = ION_HEAP_TYPE_CHUNK; @@ -188,10 +177,6 @@ struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data) return &chunk_heap->heap; -error_map_vm_area: - free_vm_area(vm_struct); -error: - gen_pool_destroy(chunk_heap->pool); error_gen_pool_create: kfree(chunk_heap); return ERR_PTR(ret); diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c index c3a213b6dcda..2d1d5555fc3d 100644 --- a/drivers/staging/android/ion/ion_heap.c +++ b/drivers/staging/android/ion/ion_heap.c @@ -114,38 +114,49 @@ static int ion_heap_clear_pages(struct page **pages, int num, pgprot_t pgprot) return 0; } +static int ion_heap_sglist_zero(struct scatterlist *sgl, unsigned int nents, + pgprot_t pgprot) +{ + int p = 0; + int ret = 0; + struct sg_page_iter piter; + struct page *pages[32]; + + for_each_sg_page(sgl, &piter, nents, 0) { + pages[p++] = sg_page_iter_page(&piter); + if (p == ARRAY_SIZE(pages)) { + ret = ion_heap_clear_pages(pages, p, pgprot); + if (ret) + return ret; + p = 0; + } + } + if (p) + ret = ion_heap_clear_pages(pages, p, pgprot); + + return ret; +} + int ion_heap_buffer_zero(struct ion_buffer *buffer) { struct sg_table *table = buffer->sg_table; pgprot_t pgprot; - struct scatterlist *sg; - int i, j, ret = 0; - struct page *pages[32]; - int k = 0; if (buffer->flags & ION_FLAG_CACHED) pgprot = PAGE_KERNEL; else pgprot = pgprot_writecombine(PAGE_KERNEL); - for_each_sg(table->sgl, sg, table->nents, i) { - struct page *page = sg_page(sg); - unsigned long len = sg->length; + return ion_heap_sglist_zero(table->sgl, table->nents, pgprot); +} - for (j = 0; j < len / PAGE_SIZE; j++) { - pages[k++] = page + j; - if (k == ARRAY_SIZE(pages)) { - ret = ion_heap_clear_pages(pages, k, pgprot); - if (ret) - goto end; - k = 0; - } - } - if (k) - ret = ion_heap_clear_pages(pages, k, pgprot); - } -end: - return ret; +int ion_heap_pages_zero(struct page *page, size_t size, pgprot_t pgprot) +{ + struct scatterlist sg; + + sg_init_table(&sg, 1); + sg_set_page(&sg, page, size, 0); + return ion_heap_sglist_zero(&sg, 1, pgprot); } void ion_heap_freelist_add(struct ion_heap *heap, struct ion_buffer * buffer) diff --git a/drivers/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h index c9b507da7708..fa96175f7731 100644 --- a/drivers/staging/android/ion/ion_priv.h +++ b/drivers/staging/android/ion/ion_priv.h @@ -215,6 +215,7 @@ void ion_heap_unmap_kernel(struct ion_heap *, struct ion_buffer *); int ion_heap_map_user(struct ion_heap *, struct ion_buffer *, struct vm_area_struct *); int ion_heap_buffer_zero(struct ion_buffer *buffer); +int ion_heap_pages_zero(struct page *page, size_t size, pgprot_t pgprot); /** * ion_heap_init_deferred_free -- initialize deferred free functionality