radv/amdgpu: Use mmap directly.

To give more control.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27689>

src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.c

@@ -35,7 +35,9 @@
 #include <inttypes.h>
 #include <pthread.h>
 #include <unistd.h>
+#include <xf86drm.h>
 #include "drm-uapi/amdgpu_drm.h"
+#include <sys/mman.h>
 
 #include "util/os_time.h"
 #include "util/u_atomic.h"
@@ -335,6 +337,9 @@ radv_amdgpu_winsys_bo_destroy(struct radeon_winsys *_ws, struct radeon_winsys_bo
       free(bo->ranges);
       u_rwlock_destroy(&bo->lock);
    } else {
+      if (bo->cpu_map)
+         munmap(bo->cpu_map, bo->size);
+
       if (ws->debug_all_bos)
          radv_amdgpu_global_bo_list_del(ws, bo);
       radv_amdgpu_bo_va_op(ws, bo->bo, 0, bo->size, bo->base.va, 0, 0, AMDGPU_VA_OP_UNMAP);
@@ -507,6 +512,7 @@ radv_amdgpu_winsys_bo_create(struct radeon_winsys *_ws, uint64_t size, unsigned
    bo->base.initial_domain = initial_domain;
    bo->base.use_global_list = false;
    bo->priority = priority;
+   bo->cpu_map = NULL;
 
    r = amdgpu_bo_export(buf_handle, amdgpu_bo_handle_type_kms, &bo->bo_handle);
    assert(!r);
@@ -554,11 +560,26 @@ static void *
 radv_amdgpu_winsys_bo_map(struct radeon_winsys *_ws, struct radeon_winsys_bo *_bo)
 {
    struct radv_amdgpu_winsys_bo *bo = radv_amdgpu_winsys_bo(_bo);
-   int ret;
-   void *data;
-   ret = amdgpu_bo_cpu_map(bo->bo, &data);
+
+   /* Safeguard for the Quantic Dream layer skipping unmaps. */
+   if (bo->cpu_map)
+      return bo->cpu_map;
+
+   union drm_amdgpu_gem_mmap args;
+   memset(&args, 0, sizeof(args));
+   args.in.handle = bo->bo_handle;
+
+   int ret =
+      drmCommandWriteRead(amdgpu_device_get_fd(radv_amdgpu_winsys(_ws)->dev), DRM_AMDGPU_GEM_MMAP, &args, sizeof(args));
    if (ret)
       return NULL;
+
+   void *data = mmap(NULL, bo->size, PROT_READ | PROT_WRITE, MAP_SHARED,
+                     amdgpu_device_get_fd(radv_amdgpu_winsys(_ws)->dev), args.out.addr_ptr);
+   if (data == MAP_FAILED)
+      return NULL;
+
+   bo->cpu_map = data;
    return data;
 }
 
@@ -566,7 +587,13 @@ static void
 radv_amdgpu_winsys_bo_unmap(struct radeon_winsys *_ws, struct radeon_winsys_bo *_bo)
 {
    struct radv_amdgpu_winsys_bo *bo = radv_amdgpu_winsys_bo(_bo);
-   amdgpu_bo_cpu_unmap(bo->bo);
+
+   /* Defense in depth against buggy apps. */
+   if (!bo->cpu_map)
+      return;
+
+   munmap(bo->cpu_map, bo->size);
+   bo->cpu_map = NULL;
 }
 
 static uint64_t
@@ -645,6 +672,7 @@ radv_amdgpu_winsys_bo_from_ptr(struct radeon_winsys *_ws, void *pointer, uint64_
    bo->base.initial_domain = RADEON_DOMAIN_GTT;
    bo->base.use_global_list = false;
    bo->priority = priority;
+   bo->cpu_map = NULL;
 
    ASSERTED int r = amdgpu_bo_export(buf_handle, amdgpu_bo_handle_type_kms, &bo->bo_handle);
    assert(!r);
@@ -733,6 +761,7 @@ radv_amdgpu_winsys_bo_from_fd(struct radeon_winsys *_ws, int fd, unsigned priori
    bo->base.use_global_list = false;
    bo->size = result.alloc_size;
    bo->priority = priority;
+   bo->cpu_map = NULL;
 
    r = amdgpu_bo_export(result.buf_handle, amdgpu_bo_handle_type_kms, &bo->bo_handle);
    assert(!r);

src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.h

@@ -59,6 +59,8 @@ struct radv_amdgpu_winsys_bo {
       struct {
          amdgpu_bo_handle bo;
          uint32_t bo_handle;
+
+         void *cpu_map;
       };
       /* virtual bo */
       struct {