drm: lima: fix common struct sg_table related issues

The Documentation/DMA-API-HOWTO.txt states that the dma_map_sg() function
returns the number of the created entries in the DMA address space.
However the subsequent calls to the dma_sync_sg_for_{device,cpu}() and
dma_unmap_sg must be called with the original number of the entries
passed to the dma_map_sg().

struct sg_table is a common structure used for describing a non-contiguous
memory buffer, used commonly in the DRM and graphics subsystems. It
consists of a scatterlist with memory pages and DMA addresses (sgl entry),
as well as the number of scatterlist entries: CPU pages (orig_nents entry)
and DMA mapped pages (nents entry).

It turned out that it was a common mistake to misuse nents and orig_nents
entries, calling DMA-mapping functions with a wrong number of entries or
ignoring the number of mapped entries returned by the dma_map_sg()
function.

To avoid such issues, lets use a common dma-mapping wrappers operating
directly on the struct sg_table objects and use scatterlist page
iterators where possible. This, almost always, hides references to the
nents and orig_nents entries, making the code robust, easier to follow
and copy/paste safe.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Qiang Yu <yuq825@gmail.com>

diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c
index 155f2b4..11223fe 100644 (file)
--- a/drivers/gpu/drm/lima/lima_gem.c
+++ b/drivers/gpu/drm/lima/lima_gem.c
@@ -69,8 +69,7 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm)
                return ret;
 
        if (bo->base.sgt) {
-               dma_unmap_sg(dev, bo->base.sgt->sgl,
-                            bo->base.sgt->nents, DMA_BIDIRECTIONAL);
+               dma_unmap_sgtable(dev, bo->base.sgt, DMA_BIDIRECTIONAL, 0);
                sg_free_table(bo->base.sgt);
        } else {
                bo->base.sgt = kmalloc(sizeof(*bo->base.sgt), GFP_KERNEL);
@@ -80,7 +79,13 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm)
                }
        }
 
-       dma_map_sg(dev, sgt.sgl, sgt.nents, DMA_BIDIRECTIONAL);
+       ret = dma_map_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
+       if (ret) {
+               sg_free_table(&sgt);
+               kfree(bo->base.sgt);
+               bo->base.sgt = NULL;
+               return ret;
+       }
 
        *bo->base.sgt = sgt;
 

diff --git a/drivers/gpu/drm/lima/lima_vm.c b/drivers/gpu/drm/lima/lima_vm.c
index 5b92fb8..2b2739a 100644 (file)
--- a/drivers/gpu/drm/lima/lima_vm.c
+++ b/drivers/gpu/drm/lima/lima_vm.c
@@ -124,7 +124,7 @@ int lima_vm_bo_add(struct lima_vm *vm, struct lima_bo *bo, bool create)
        if (err)
                goto err_out1;
 
-       for_each_sg_dma_page(bo->base.sgt->sgl, &sg_iter, bo->base.sgt->nents, 0) {
+       for_each_sgtable_dma_page(bo->base.sgt, &sg_iter, 0) {
                err = lima_vm_map_page(vm, sg_page_iter_dma_address(&sg_iter),
                                       bo_va->node.start + offset);
                if (err)
@@ -298,8 +298,7 @@ int lima_vm_map_bo(struct lima_vm *vm, struct lima_bo *bo, int pageoff)
        mutex_lock(&vm->lock);
 
        base = bo_va->node.start + (pageoff << PAGE_SHIFT);
-       for_each_sg_dma_page(bo->base.sgt->sgl, &sg_iter,
-                            bo->base.sgt->nents, pageoff) {
+       for_each_sgtable_dma_page(bo->base.sgt, &sg_iter, pageoff) {
                err = lima_vm_map_page(vm, sg_page_iter_dma_address(&sg_iter),
                                       base + offset);
                if (err)