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| author | Rebecca Schultz Zavin | 2013-12-13 23:23:50 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2013-12-14 17:55:37 +0100 |
| commit | 56a7c1851341a2fa9bd115746c1310411a6537a1 (patch) | |
| tree | bfdd603f48f2ede69c7609a26a50419f27a548c1 /drivers/staging/android/ion/ion_system_heap.c | |
| parent | gpu: ion: Map only the vma size given (diff) | |
| download | kernel-qcow2-linux-56a7c1851341a2fa9bd115746c1310411a6537a1.tar.gz kernel-qcow2-linux-56a7c1851341a2fa9bd115746c1310411a6537a1.tar.xz kernel-qcow2-linux-56a7c1851341a2fa9bd115746c1310411a6537a1.zip | |
gpu: ion: Add cache maintenance to ion.
This patch adds cache maintenance operations to ion. As per mailing
list discussions regarding dma_buf, cache operations are done implicitly.
At buffer allocaiton time the user can select whether he'd like mappings
(both kernel and user) to be cached. When cached mappings are selected,
no mappings will be created for a buffer at mmap time. Instead pages will
be faulted in one at a time so we can track which pages require flushing
before dma. When the buffers are mapped for dma (via the dma_buf apis)
any pages which were touched will be synced for device.
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/android/ion/ion_system_heap.c')
| -rw-r--r-- | drivers/staging/android/ion/ion_system_heap.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c index 35b3726e4a34..dceed5b791cf 100644 --- a/drivers/staging/android/ion/ion_system_heap.c +++ b/drivers/staging/android/ion/ion_system_heap.c @@ -87,13 +87,20 @@ void *ion_system_heap_map_kernel(struct ion_heap *heap, struct scatterlist *sg; int i; void *vaddr; + pgprot_t pgprot; struct sg_table *table = buffer->priv_virt; struct page **pages = kmalloc(sizeof(struct page *) * table->nents, GFP_KERNEL); for_each_sg(table->sgl, sg, table->nents, i) pages[i] = sg_page(sg); - vaddr = vmap(pages, table->nents, VM_MAP, PAGE_KERNEL); + + if (buffer->flags & ION_FLAG_CACHED) + pgprot = PAGE_KERNEL; + else + pgprot = pgprot_writecombine(PAGE_KERNEL); + + vaddr = vmap(pages, table->nents, VM_MAP, pgprot); kfree(pages); return vaddr; @@ -179,7 +186,7 @@ static int ion_system_contig_heap_phys(struct ion_heap *heap, } struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap, - struct ion_buffer *buffer) + struct ion_buffer *buffer) { struct sg_table *table; int ret; @@ -197,6 +204,13 @@ struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap, return table; } +void ion_system_contig_heap_unmap_dma(struct ion_heap *heap, + struct ion_buffer *buffer) +{ + sg_free_table(buffer->sg_table); + kfree(buffer->sg_table); +} + int ion_system_contig_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer, struct vm_area_struct *vma) @@ -213,7 +227,7 @@ static struct ion_heap_ops kmalloc_ops = { .free = ion_system_contig_heap_free, .phys = ion_system_contig_heap_phys, .map_dma = ion_system_contig_heap_map_dma, - .unmap_dma = ion_system_heap_unmap_dma, + .unmap_dma = ion_system_contig_heap_unmap_dma, .map_kernel = ion_system_heap_map_kernel, .unmap_kernel = ion_system_heap_unmap_kernel, .map_user = ion_system_contig_heap_map_user, |