Mesa (main): intel/stub: Implement DRM_I915_QUERY_MEMORY_REGIONS

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Module: Mesa
Branch: main
Commit: 832db9d9008e32f2da5d4180b9a3a896258bce20
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=832db9d9008e32f2da5d4180b9a3a896258bce20

Author: Ian Romanick <ian.d.romanick at intel.com>
Date:   Mon Dec  6 12:56:01 2021 -0800

intel/stub: Implement DRM_I915_QUERY_MEMORY_REGIONS

Borrowed from sim-drm.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14132>

---

 src/intel/tools/intel_noop_drm_shim.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/intel/tools/intel_noop_drm_shim.c b/src/intel/tools/intel_noop_drm_shim.c
index ec237cb23e2..fbb475da9ac 100644
--- a/src/intel/tools/intel_noop_drm_shim.c
+++ b/src/intel/tools/intel_noop_drm_shim.c
@@ -352,6 +352,40 @@ i915_ioctl_query(int fd, unsigned long request, void *arg)
          item->length = -EINVAL;
          break;
 
+      case DRM_I915_QUERY_MEMORY_REGIONS: {
+         uint32_t num_regions = i915.devinfo.has_local_mem ? 2 : 1;
+         struct drm_i915_query_memory_regions *info =
+            (struct drm_i915_query_memory_regions*)(uintptr_t)item->data_ptr;
+         size_t data_length = sizeof(struct drm_i915_query_memory_regions) +
+            num_regions * sizeof(struct drm_i915_memory_region_info);
+
+         if (item->length == 0) {
+            item->length = data_length;
+            return 0;
+         } else if (item->length < (int32_t)data_length) {
+            item->length = -EINVAL;
+            return -1;
+         } else {
+            memset(info, 0, data_length);
+            info->num_regions = num_regions;
+            info->regions[0].region.memory_class = I915_MEMORY_CLASS_SYSTEM;
+            info->regions[0].region.memory_instance = 0;
+            /* Report 4Gb even if it's not actually true, it looks more like a
+             * real device.
+             */
+            info->regions[0].probed_size = 4ull * 1024 * 1024 * 1024;
+            info->regions[0].unallocated_size = -1ll;
+            if (i915.devinfo.has_local_mem) {
+               info->regions[1].region.memory_class = I915_MEMORY_CLASS_DEVICE;
+               info->regions[1].region.memory_instance = 0;
+               info->regions[1].probed_size = 4ull * 1024 * 1024 * 1024;
+               info->regions[1].unallocated_size = -1ll;
+            }
+            return 0;
+         }
+         break;
+      }
+
       default:
          fprintf(stderr, "Unknown drm_i915_query_item id=%lli\n", item->query_id);
          item->length = -EINVAL;