From: Rebecca Schultz Zavin Date: Fri, 13 Dec 2013 22:23:37 +0000 (-0800) Subject: ion: Switch map/unmap dma api to sg_tables X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4d5ca3299fb7b27ceb6c33a62bc10ce4d408dc0b;p=linux-beck.git ion: Switch map/unmap dma api to sg_tables Switch these api's from scatterlists to sg_tables Signed-off-by: Rebecca Schultz Zavin [jstultz: modified patch to apply to staging directory] Signed-off-by: John Stultz Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index d93fb33d05ed..bca8d9e925e4 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -445,11 +445,11 @@ void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle) return vaddr; } -struct scatterlist *ion_map_dma(struct ion_client *client, +struct sg_table *ion_map_dma(struct ion_client *client, struct ion_handle *handle) { struct ion_buffer *buffer; - struct scatterlist *sglist; + struct sg_table *table; mutex_lock(&client->lock); if (!ion_handle_validate(client, handle)) { @@ -469,16 +469,16 @@ struct scatterlist *ion_map_dma(struct ion_client *client, return ERR_PTR(-ENODEV); } if (_ion_map(&buffer->dmap_cnt, &handle->dmap_cnt)) { - sglist = buffer->heap->ops->map_dma(buffer->heap, buffer); - if (IS_ERR_OR_NULL(sglist)) + table = buffer->heap->ops->map_dma(buffer->heap, buffer); + if (IS_ERR_OR_NULL(table)) _ion_unmap(&buffer->dmap_cnt, &handle->dmap_cnt); - buffer->sglist = sglist; + buffer->sg_table = table; } else { - sglist = buffer->sglist; + table = buffer->sg_table; } mutex_unlock(&buffer->lock); mutex_unlock(&client->lock); - return sglist; + return table; } void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle) @@ -505,7 +505,7 @@ void ion_unmap_dma(struct ion_client *client, struct ion_handle *handle) mutex_lock(&buffer->lock); if (_ion_unmap(&buffer->dmap_cnt, &handle->dmap_cnt)) { buffer->heap->ops->unmap_dma(buffer->heap, buffer); - buffer->sglist = NULL; + buffer->sg_table = NULL; } mutex_unlock(&buffer->lock); mutex_unlock(&client->lock); diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h index 60b25439af50..87f6a45bcd1f 100644 --- a/drivers/staging/android/ion/ion.h +++ b/drivers/staging/android/ion/ion.h @@ -169,10 +169,10 @@ void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle); * @client: the client * @handle: handle to map * - * Return an sglist describing the given handle + * Return an sg_table describing the given handle */ -struct scatterlist *ion_map_dma(struct ion_client *client, - struct ion_handle *handle); +struct sg_table *ion_map_dma(struct ion_client *client, + struct ion_handle *handle); /** * ion_unmap_dma() - destroy a dma mapping for a handle diff --git a/drivers/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h index cbd9f03b5870..7a77f6f626c8 100644 --- a/drivers/staging/android/ion/ion_priv.h +++ b/drivers/staging/android/ion/ion_priv.h @@ -24,18 +24,6 @@ #include "ion.h" -struct ion_mapping; - -struct ion_dma_mapping { - struct kref ref; - struct scatterlist *sglist; -}; - -struct ion_kernel_mapping { - struct kref ref; - void *vaddr; -}; - struct ion_buffer *ion_handle_buffer(struct ion_handle *handle); /** @@ -54,7 +42,7 @@ struct ion_buffer *ion_handle_buffer(struct ion_handle *handle); * @kmap_cnt: number of times the buffer is mapped to the kernel * @vaddr: the kenrel mapping if kmap_cnt is not zero * @dmap_cnt: number of times the buffer is mapped for dma - * @sglist: the scatterlist for the buffer is dmap_cnt is not zero + * @sg_table: the sg table for the buffer if dmap_cnt is not zero */ struct ion_buffer { struct kref ref; @@ -71,7 +59,7 @@ struct ion_buffer { int kmap_cnt; void *vaddr; int dmap_cnt; - struct scatterlist *sglist; + struct sg_table *sg_table; }; /** @@ -93,7 +81,7 @@ struct ion_heap_ops { void (*free) (struct ion_buffer *buffer); int (*phys) (struct ion_heap *heap, struct ion_buffer *buffer, ion_phys_addr_t *addr, size_t *len); - struct scatterlist *(*map_dma) (struct ion_heap *heap, + struct sg_table *(*map_dma) (struct ion_heap *heap, struct ion_buffer *buffer); void (*unmap_dma) (struct ion_heap *heap, struct ion_buffer *buffer); void * (*map_kernel) (struct ion_heap *heap, struct ion_buffer *buffer); diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c index 3daa1eeb8bd8..d7e0fa0c1ef6 100644 --- a/drivers/staging/android/ion/ion_system_heap.c +++ b/drivers/staging/android/ion/ion_system_heap.c @@ -38,40 +38,46 @@ void ion_system_heap_free(struct ion_buffer *buffer) vfree(buffer->priv_virt); } -struct scatterlist *ion_system_heap_map_dma(struct ion_heap *heap, - struct ion_buffer *buffer) +struct sg_table *ion_system_heap_map_dma(struct ion_heap *heap, + struct ion_buffer *buffer) { - struct scatterlist *sglist; - struct page *page; + struct sg_table *table; + struct scatterlist *sg; int i; int npages = PAGE_ALIGN(buffer->size) / PAGE_SIZE; void *vaddr = buffer->priv_virt; + int ret; - sglist = vmalloc(npages * sizeof(struct scatterlist)); - if (!sglist) + table = kzalloc(sizeof(struct sg_table), GFP_KERNEL); + if (!table) return ERR_PTR(-ENOMEM); - memset(sglist, 0, npages * sizeof(struct scatterlist)); - sg_init_table(sglist, npages); - for (i = 0; i < npages; i++) { + ret = sg_alloc_table(table, npages, GFP_KERNEL); + if (ret) + goto err0; + for_each_sg(table->sgl, sg, table->nents, i) { + struct page *page; page = vmalloc_to_page(vaddr); - if (!page) - goto end; - sg_set_page(&sglist[i], page, PAGE_SIZE, 0); + if (!page) { + ret = -ENOMEM; + goto err1; + } + sg_set_page(sg, page, PAGE_SIZE, 0); vaddr += PAGE_SIZE; } - /* XXX do cache maintenance for dma? */ - return sglist; -end: - vfree(sglist); - return NULL; + return table; +err1: + sg_free_table(table); +err0: + kfree(table); + return ERR_PTR(ret); } void ion_system_heap_unmap_dma(struct ion_heap *heap, struct ion_buffer *buffer) { - /* XXX undo cache maintenance for dma? */ - if (buffer->sglist) - vfree(buffer->sglist); + if (buffer->sg_table) + sg_free_table(buffer->sg_table); + kfree(buffer->sg_table); } void *ion_system_heap_map_kernel(struct ion_heap *heap, @@ -144,17 +150,23 @@ static int ion_system_contig_heap_phys(struct ion_heap *heap, return 0; } -struct scatterlist *ion_system_contig_heap_map_dma(struct ion_heap *heap, +struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap, struct ion_buffer *buffer) { - struct scatterlist *sglist; + struct sg_table *table; + int ret; - sglist = vmalloc(sizeof(struct scatterlist)); - if (!sglist) + table = kzalloc(sizeof(struct sg_table), GFP_KERNEL); + if (!table) return ERR_PTR(-ENOMEM); - sg_init_table(sglist, 1); - sg_set_page(sglist, virt_to_page(buffer->priv_virt), buffer->size, 0); - return sglist; + ret = sg_alloc_table(table, 1, GFP_KERNEL); + if (ret) { + kfree(table); + return ERR_PTR(ret); + } + sg_set_page(table->sgl, virt_to_page(buffer->priv_virt), buffer->size, + 0); + return table; } int ion_system_contig_heap_map_user(struct ion_heap *heap,