On 10/16/24 6:25 AM, Matthew Brost wrote:
+/**
+ * xe_devm_add: Remap and provide memmap backing for device memory
+ * @tile: tile that the memory region belongs to
+ * @mr: memory region to remap
+ *
+ * This remap device memory to host physical address space and create
+ * struct page to back device memory
+ *
+ * Return: 0 on success standard error code otherwise
+ */
+int xe_devm_add(struct xe_tile *tile, struct xe_mem_region *mr)
+{
+ struct xe_device *xe = tile_to_xe(tile);
+ struct device *dev = &to_pci_dev(xe->drm.dev)->dev;
+ struct resource *res;
+ void *addr;
+ int ret;
+
+ res = devm_request_free_mem_region(dev, &iomem_resource,
+ mr->usable_size);
To use the devm_request_free_mem_region() function,
CONFIG_GET_FREE_REGION=y in config.
xe's kconfig need to have CONFIG_GET_FREE_REGION dependency.
+ if (IS_ERR(res)) {
+ ret = PTR_ERR(res);
+ return ret;
+ }
+
+ mr->pagemap.type = MEMORY_DEVICE_PRIVATE;
+ mr->pagemap.range.start = res->start;
+ mr->pagemap.range.end = res->end;
+ mr->pagemap.nr_range = 1;
+ mr->pagemap.ops = drm_gpusvm_pagemap_ops_get();
+ mr->pagemap.owner = xe_svm_devm_owner(xe);
+ addr = devm_memremap_pages(dev, &mr->pagemap);
+ if (IS_ERR(addr)) {
+ devm_release_mem_region(dev, res->start, resource_size(res));
+ ret = PTR_ERR(addr);
+ drm_err(&xe->drm, "Failed to remap tile %d memory, errno %d\n",
+ tile->id, ret);
+ return ret;
+ }
+ mr->hpa_base = res->start;
+
+ drm_info(&xe->drm, "Added tile %d memory [%llx-%llx] to devm, remapped to %pr\n",
+ tile->id, mr->io_start, mr->io_start + mr->usable_size, res);
+ return 0;
+}
