vk: Map uncached, coherent memory as write-combine

This gives us the required characteristics for the memory type.

src/vulkan/anv_allocator.c

@@ -825,7 +825,7 @@ anv_bo_pool_alloc(struct anv_bo_pool *pool, struct anv_bo *bo)
 
    assert(new_bo.size == pool->bo_size);
 
-   new_bo.map = anv_gem_mmap(pool->device, new_bo.gem_handle, 0, pool->bo_size);
+   new_bo.map = anv_gem_mmap(pool->device, new_bo.gem_handle, 0, pool->bo_size, 0);
    if (new_bo.map == NULL) {
       anv_gem_close(pool->device, new_bo.gem_handle);
       return vk_error(VK_ERROR_MEMORY_MAP_FAILED);

src/vulkan/anv_device.c

@@ -121,6 +121,12 @@ anv_physical_device_init(struct anv_physical_device *device,
       goto fail;
    }
 
+   if (anv_gem_get_param(fd, I915_PARAM_MMAP_VERSION < 1)) {
+      result = vk_errorf(VK_ERROR_INITIALIZATION_FAILED,
+                         "kernel missing wc mmap");
+      goto fail;
+   }
+
    close(fd);
 
    brw_process_intel_debug_variable();
@@ -1059,7 +1065,11 @@ VkResult anv_MapMemory(
     * pointer here, but that may exhaust virtual memory on 32 bit
     * userspace. */
 
-   mem->map = anv_gem_mmap(device, mem->bo.gem_handle, offset, size);
+   uint32_t gem_flags = 0;
+   if (!device->info.has_llc && mem->type_index == 0)
+      gem_flags |= I915_MMAP_WC;
+
+   mem->map = anv_gem_mmap(device, mem->bo.gem_handle, offset, size, gem_flags);
    mem->map_size = size;
 
    *ppData = mem->map;
@@ -1254,7 +1264,7 @@ VkResult anv_CreateFence(
       goto fail;
 
    fence->bo.map =
-      anv_gem_mmap(device, fence->bo.gem_handle, 0, fence->bo.size);
+      anv_gem_mmap(device, fence->bo.gem_handle, 0, fence->bo.size, 0);
    batch.next = batch.start = fence->bo.map;
    batch.end = fence->bo.map + fence->bo.size;
    anv_batch_emit(&batch, GEN7_MI_BATCH_BUFFER_END);

src/vulkan/anv_gem.c

@@ -84,7 +84,7 @@ anv_gem_close(struct anv_device *device, int gem_handle)
  */
 void*
 anv_gem_mmap(struct anv_device *device, uint32_t gem_handle,
-             uint64_t offset, uint64_t size)
+             uint64_t offset, uint64_t size, uint32_t flags)
 {
    struct drm_i915_gem_mmap gem_mmap;
    int ret;
@@ -94,10 +94,7 @@ anv_gem_mmap(struct anv_device *device, uint32_t gem_handle,
    gem_mmap.offset = offset;
    gem_mmap.size = size;
    VG_CLEAR(gem_mmap.addr_ptr);
-
-#ifdef I915_MMAP_WC
-   gem_mmap.flags = 0;
-#endif
+   gem_mmap.flags = flags;
 
    ret = anv_ioctl(device->fd, DRM_IOCTL_I915_GEM_MMAP, &gem_mmap);
    if (ret != 0) {

src/vulkan/anv_private.h

@@ -597,7 +597,7 @@ struct anv_device {
 };
 
 void* anv_gem_mmap(struct anv_device *device,
-                   uint32_t gem_handle, uint64_t offset, uint64_t size);
+                   uint32_t gem_handle, uint64_t offset, uint64_t size, uint32_t flags);
 void anv_gem_munmap(void *p, uint64_t size);
 uint32_t anv_gem_create(struct anv_device *device, size_t size);
 void anv_gem_close(struct anv_device *device, int gem_handle);

src/vulkan/anv_query.c

@@ -69,7 +69,7 @@ VkResult anv_CreateQueryPool(
    if (result != VK_SUCCESS)
       goto fail;
 
-   pool->bo.map = anv_gem_mmap(device, pool->bo.gem_handle, 0, size);
+   pool->bo.map = anv_gem_mmap(device, pool->bo.gem_handle, 0, size, 0);
 
    *pQueryPool = anv_query_pool_to_handle(pool);