gpu: nvgpu: add PRAMIN support for mem accessors

To support vidmem, implement a way to access buffers via the PRAMIN
window instead of just kernel-mapped sysmem buffers for iGPU as of now.
Depending on the buffer aperture, choose between the two access types in
the buffer memory accessor functions.

vmap()/vunmap() pairs are no-ops for buffers that can't be cpu-mapped.

Two uses of DMA_ATTR_READ_ONLY are removed in the ucode loading path to
support writing to them too via the indirection in addition to cpu.

JIRA DNVGPU-23

Change-Id: I282dba6741c6b8224bc12e69c1fb3936bde7e6ed
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1141314
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index d943b231..c58a4fec 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -40,10 +40,17 @@
                 outer_flush_range(pa, pa + (size_t)(size));             \
         } while (0)
 
+enum gk20a_aperture {
+        APERTURE_INVALID, /* e.g., unallocated */
+        APERTURE_SYSMEM,
+        APERTURE_VIDMEM
+};
+
 struct mem_desc {
         void *cpu_va;
         struct page **pages;
         struct sg_table *sgt;
+        enum gk20a_aperture aperture;
         size_t size;
         u64 gpu_va;
 };
@@ -357,6 +364,14 @@ struct mm_gk20a {
         bool vidmem_is_vidmem;
 
         struct mem_desc sysmem_flush;
+
+        u32 pramin_base;
+        spinlock_t pramin_base_lock;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,4,0)
+        u32 force_pramin; /* via debugfs */
+#else
+        bool force_pramin; /* via debugfs */
+#endif
 };
 
 int gk20a_mm_init(struct mm_gk20a *mm);