gpu: nvgpu: add support for L3 cache allocation of buffers

Add gv11b implementation of gpu_phys_addr() that checks the t19x
GMMU attributes struct to determine if L3 allocation should be
enabled. If L3 alloc is enabled then a special physical address
bit is set.

Add flag NVGPU_AS_MAP_BUFFER_FLAGS_L3_ALLOC to struct
nvgpu_as_map_buffer_ex_args so that User space can add a hint to
allocate buffer in L3 cache

Jira GPUT19X-10
Bug 200279508

Change-Id: I1bb9876a670b252980922aa50e3e69b802be137f
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master/r/1512602
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gv11b/mm_gv11b.c b/drivers/gpu/nvgpu/gv11b/mm_gv11b.c
index 9d1e0f25..cc8dafa3 100644
--- a/drivers/gpu/nvgpu/gv11b/mm_gv11b.c
+++ b/drivers/gpu/nvgpu/gv11b/mm_gv11b.c
@@ -23,6 +23,8 @@
 
 #include <nvgpu/hw/gv11b/hw_fb_gv11b.h>
 
+#define NVGPU_L3_ALLOC_BIT      36
+
 static bool gv11b_mm_is_bar1_supported(struct gk20a *g)
 {
         return false;
@@ -61,6 +63,20 @@ void gv11b_mm_l2_flush(struct gk20a *g, bool invalidate)
         g->ops.mm.fb_flush(g);
 }
 
+/*
+ * On Volta the GPU determines whether to do L3 allocation for a mapping by
+ * checking bit 36 of the phsyical address. So if a mapping should allocte lines
+ * in the L3 this bit must be set.
+ */
+u64 gv11b_gpu_phys_addr(struct gk20a *g,
+                        struct nvgpu_gmmu_attrs *attrs, u64 phys)
+{
+        if (attrs->t19x_attrs.l3_alloc)
+                return phys | NVGPU_L3_ALLOC_BIT;
+
+        return phys;
+}
+
 void gv11b_init_mm(struct gpu_ops *gops)
 {
         gp10b_init_mm(gops);
@@ -69,4 +85,5 @@ void gv11b_init_mm(struct gpu_ops *gops)
         gops->mm.init_mm_setup_hw = gk20a_init_mm_setup_hw;
         gops->mm.mmu_fault_pending = gv11b_mm_mmu_fault_pending;
         gops->mm.l2_flush = gv11b_mm_l2_flush;
+        gops->mm.gpu_phys_addr = gv11b_gpu_phys_addr;
 }