msm: kgsl: Enable "big page" memory allocations
Allow users to specify "big page" mode when allocating GPU
memory. This will attempt to allocate contigious units of 64k
bytes per instead of the usual PAGE_SIZE units. If the allocation
fails, then automatically fall back to allocate the rest of the
region with 4K pages. This means that potentially any allocation
could be comprised of a mixture of 64k chunks and 4k chunks.
Change-Id: Ib92c0c099d3b10ba54dbb864c5f977f8df4912f2
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_mmu.c b/drivers/gpu/msm/kgsl_mmu.c
index 54ba5ad..dbb88ee 100644
--- a/drivers/gpu/msm/kgsl_mmu.c
+++ b/drivers/gpu/msm/kgsl_mmu.c
@@ -606,6 +606,7 @@
int ret;
struct gen_pool *pool;
int size;
+ int page_align = ilog2(PAGE_SIZE);
if (kgsl_mmu_type == KGSL_MMU_TYPE_NONE) {
if (memdesc->sglen == 1) {
@@ -630,7 +631,17 @@
/* Allocate from kgsl pool if it exists for global mappings */
pool = _get_pool(pagetable, memdesc->priv);
- memdesc->gpuaddr = gen_pool_alloc(pool, size);
+ /* Allocate aligned virtual addresses for iommu. This allows
+ * more efficient pagetable entries if the physical memory
+ * is also aligned. Don't do this for GPUMMU, because
+ * the address space is so small.
+ */
+ if (KGSL_MMU_TYPE_IOMMU == kgsl_mmu_get_mmutype() &&
+ (memdesc->priv & KGSL_MEMALIGN_MASK)) {
+ page_align = (memdesc->priv & KGSL_MEMALIGN_MASK)
+ >> KGSL_MEMALIGN_SHIFT;
+ }
+ memdesc->gpuaddr = gen_pool_alloc_aligned(pool, size, page_align);
if (memdesc->gpuaddr == 0) {
KGSL_CORE_ERR("gen_pool_alloc(%d) failed from pool: %s\n",
size,