anv: Add support for userptr in Xe KMD

Xe KMD only requires userptr to be bound to VM, so here reusing
workaround_bo->gem_handle id to all userptr bos in Xe version of
gem_create_userptr(). The Xe version of gem_close() will make sure
that workaround_bo->gem_handle is not closed when userptr bos
are closed.

With the same gem_handle for all userptr bos, it was also necessary
skip the anv_device_lookup_bo() and manually allocate memory to store
anv_bo in host heap memory, what lead to some small changes in
anv_device_release_bo() as well.

The remaining changes are the support to VM bind userptr bos and the
gem_vm_bind() call in anv_device_import_bo_from_host_ptr().

Fixes: dEQP-VK.memory.external_memory_host*
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23787>

src/intel/vulkan/anv_allocator.c

@@ -1640,7 +1640,18 @@ anv_device_import_bo_from_host_ptr(struct anv_device *device,
 
    pthread_mutex_lock(&cache->mutex);
 
-   struct anv_bo *bo = anv_device_lookup_bo(device, gem_handle);
+   struct anv_bo *bo = NULL;
+   if (device->info->kmd_type == INTEL_KMD_TYPE_XE) {
+      bo = vk_zalloc(&device->vk.alloc, sizeof(*bo), 8,
+                     VK_SYSTEM_ALLOCATION_SCOPE_DEVICE);
+      if (!bo) {
+         pthread_mutex_unlock(&cache->mutex);
+         return VK_ERROR_OUT_OF_HOST_MEMORY;
+      }
+   } else {
+      bo = anv_device_lookup_bo(device, gem_handle);
+   }
+
    if (bo->refcount > 0) {
       /* VK_EXT_external_memory_host doesn't require handling importing the
        * same pointer twice at the same time, but we don't get in the way.  If
@@ -1693,6 +1704,13 @@ anv_device_import_bo_from_host_ptr(struct anv_device *device,
          return result;
       }
 
+      if (device->kmd_backend->gem_vm_bind(device, &new_bo)) {
+         VkResult res = vk_errorf(device, VK_ERROR_UNKNOWN, "vm bind failed: %m");
+         anv_bo_vma_free(device, &new_bo);
+         pthread_mutex_unlock(&cache->mutex);
+         return res;
+      }
+
       *bo = new_bo;
    }
 
@@ -1909,7 +1927,10 @@ anv_device_release_bo(struct anv_device *device,
                       struct anv_bo *bo)
 {
    struct anv_bo_cache *cache = &device->bo_cache;
-   assert(anv_device_lookup_bo(device, bo->gem_handle) == bo);
+   const bool bo_is_xe_userptr = device->info->kmd_type == INTEL_KMD_TYPE_XE &&
+                                 bo->from_host_ptr;
+   assert(bo_is_xe_userptr ||
+          anv_device_lookup_bo(device, bo->gem_handle) == bo);
 
    /* Try to decrement the counter but don't go below one.  If this succeeds
     * then the refcount has been decremented and we are not the last
@@ -1948,6 +1969,9 @@ anv_device_release_bo(struct anv_device *device,
     */
    struct anv_bo old_bo = *bo;
 
+   if (bo_is_xe_userptr)
+      vk_free(&device->vk.alloc, bo);
+   else
       memset(bo, 0, sizeof(*bo));
 
    anv_bo_finish(device, &old_bo);

src/intel/vulkan/anv_private.h

@@ -404,6 +404,7 @@ struct anv_bo {
     */
    struct util_vma_heap *vma_heap;
 
+   /* All userptr bos in Xe KMD has gem_handle set to workaround_bo->gem_handle */
    uint32_t gem_handle;
 
    uint32_t refcount;

src/intel/vulkan/xe/anv_kmd_backend.c

@@ -94,6 +94,15 @@ xe_gem_vm_bind_op(struct anv_device *device, struct anv_bo *bo, uint32_t op)
    if (ret)
       return ret;
 
+   uint32_t obj = op == XE_VM_BIND_OP_UNMAP ? 0 : bo->gem_handle;
+   uint64_t obj_offset = 0;
+   if (bo->from_host_ptr) {
+      obj = 0;
+      obj_offset = (uintptr_t)bo->map;
+      if (op == XE_VM_BIND_OP_MAP)
+         op = XE_VM_BIND_OP_MAP_USERPTR;
+   }
+
    struct drm_xe_sync sync = {
       .flags = DRM_XE_SYNC_SYNCOBJ | DRM_XE_SYNC_SIGNAL,
       .handle = syncobj_handle,
@@ -101,8 +110,8 @@ xe_gem_vm_bind_op(struct anv_device *device, struct anv_bo *bo, uint32_t op)
    struct drm_xe_vm_bind args = {
       .vm_id = device->vm_id,
       .num_binds = 1,
-      .bind.obj = op == XE_VM_BIND_OP_UNMAP ? 0 : bo->gem_handle,
-      .bind.obj_offset = 0,
+      .bind.obj = obj,
+      .bind.obj_offset = obj_offset,
       .bind.range = bo->actual_size,
       .bind.addr = intel_48b_address(bo->offset),
       .bind.op = op,
@@ -141,7 +150,11 @@ static int xe_gem_vm_unbind(struct anv_device *device, struct anv_bo *bo)
 static uint32_t
 xe_gem_create_userptr(struct anv_device *device, void *mem, uint64_t size)
 {
-   return 0;
+   /* We return the workaround BO gem_handle here, because Xe doesn't
+    * create handles for userptrs. But we still need to make it look
+    * to the rest of Anv that the operation succeeded.
+    */
+   return device->workaround_bo->gem_handle;
 }
 
 const struct anv_kmd_backend *