gpu: nvgpu: Add helpers for backing store access

This patch adds mm helpers to access compression backing store
from in-kernel shader.

Bug 1409151

Change-Id: Icb4f6dc0b5a35fdb97bc4221ab3657866f775fae
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/440263
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Lauri Peltonen <lpeltonen@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 16 insertions, 9 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
index e580732a..e7a97207 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
@@ -111,11 +111,6 @@ static const u64 gmmu_page_offset_masks[gmmu_nr_page_sizes] = { 0xfffLL,
                                                                 0x1ffffLL };
 static const u64 gmmu_page_masks[gmmu_nr_page_sizes] = { ~0xfffLL, ~0x1ffffLL };
 
-struct gk20a_comptags {
-        u32 offset;
-        u32 lines;
-};
-
 struct gk20a_dmabuf_priv {
         struct mutex lock;
 
@@ -197,10 +192,8 @@ void gk20a_mm_unpin(struct device *dev, struct dma_buf *dmabuf,
         mutex_unlock(&priv->lock);
 }
 
-
-static void gk20a_get_comptags(struct device *dev,
-                               struct dma_buf *dmabuf,
-                               struct gk20a_comptags *comptags)
+void gk20a_get_comptags(struct device *dev, struct dma_buf *dmabuf,
+                        struct gk20a_comptags *comptags)
 {
         struct gk20a_dmabuf_priv *priv = dma_buf_get_drvdata(dmabuf, dev);
 
@@ -1539,6 +1532,20 @@ u64 gk20a_gmmu_map(struct vm_gk20a *vm,
         return vaddr;
 }
 
+dma_addr_t gk20a_mm_gpuva_to_iova(struct vm_gk20a *vm, u64 gpu_vaddr)
+{
+        struct mapped_buffer_node *buffer;
+        dma_addr_t addr = 0;
+
+        mutex_lock(&vm->update_gmmu_lock);
+        buffer = find_mapped_buffer_locked(&vm->mapped_buffers, gpu_vaddr);
+        if (buffer)
+                addr = gk20a_mm_iova_addr(buffer->sgt->sgl);
+        mutex_unlock(&vm->update_gmmu_lock);
+
+        return addr;
+}
+
 void gk20a_gmmu_unmap(struct vm_gk20a *vm,
                 u64 vaddr,
                 u64 size,