radv: make shader BOs read-only for the GPU

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
index 5f78af6..528d353 100644 (file)
--- a/src/amd/vulkan/radv_device.c
+++ b/src/amd/vulkan/radv_device.c
@@ -263,6 +263,8 @@ radv_physical_device_init(struct radv_physical_device *device,
         */
        device->has_clear_state = device->rad_info.chip_class >= CIK;
 
+       device->cpdma_prefetch_writes_memory = device->rad_info.chip_class <= VI;
+
        radv_physical_device_init_mem_types(device);
 
        result = radv_init_wsi(device);

diff --git a/src/amd/vulkan/radv_private.h b/src/amd/vulkan/radv_private.h
index 30ccbea..f691c83 100644 (file)
--- a/src/amd/vulkan/radv_private.h
+++ b/src/amd/vulkan/radv_private.h
@@ -272,6 +272,7 @@ struct radv_physical_device {
        bool has_rbplus; /* if RB+ register exist */
        bool rbplus_allowed; /* if RB+ is allowed */
        bool has_clear_state;
+       bool cpdma_prefetch_writes_memory;
 
        /* This is the drivers on-disk cache used as a fallback as opposed to
         * the pipeline cache defined by apps.

diff --git a/src/amd/vulkan/radv_shader.c b/src/amd/vulkan/radv_shader.c
index 3187980..971d3ab 100644 (file)
--- a/src/amd/vulkan/radv_shader.c
+++ b/src/amd/vulkan/radv_shader.c
@@ -330,7 +330,10 @@ radv_alloc_shader_memory(struct radv_device *device,
 
        slab->size = 256 * 1024;
        slab->bo = device->ws->buffer_create(device->ws, slab->size, 256,
-                                            RADEON_DOMAIN_VRAM, RADEON_FLAG_NO_INTERPROCESS_SHARING);
+                                            RADEON_DOMAIN_VRAM,
+                                            RADEON_FLAG_NO_INTERPROCESS_SHARING |
+                                            device->physical_device->cpdma_prefetch_writes_memory ?
+                                                    0 : RADEON_FLAG_READ_ONLY);
        slab->ptr = (char*)device->ws->buffer_map(slab->bo);
        list_inithead(&slab->shaders);