@@ -41,6 +41,48 @@ const struct intel_memory_region_ops intel_region_lmem_ops = {
.create_object = __i915_gem_lmem_object_create,
};
+static void get_legacy_lowmem_region(struct intel_uncore *uncore,
+ u64 *start, u32 *size)
+{
+ *start = 0;
+ *size = 0;
+
+ if (!IS_DG1_REVID(uncore->i915, DG1_REVID_A0, DG1_REVID_A0))
+ return;
+
+ *size = SZ_1M;
+
+ DRM_DEBUG_DRIVER("LMEM: reserved legacy low-memory [0x%llx-0x%llx]\n",
+ *start, *start + *size);
+}
+
+static int reserve_lowmem_region(struct intel_uncore *uncore,
+ struct intel_memory_region *mem)
+{
+ u64 reserve_start;
+ u64 reserve_end;
+ u64 region_start;
+ u32 region_size;
+ int ret;
+
+ get_legacy_lowmem_region(uncore, ®ion_start, ®ion_size);
+ reserve_start = region_start;
+ reserve_end = region_start + region_size;
+
+ if (!reserve_end)
+ return 0;
+
+ DRM_INFO("LMEM: reserving low-memory region [0x%llx-0x%llx]\n",
+ reserve_start, reserve_end);
+ ret = i915_buddy_alloc_range(&mem->mm, &mem->reserved,
+ reserve_start,
+ reserve_end - reserve_start);
+ if (ret)
+ DRM_ERROR("LMEM: reserving low memory region failed\n");
+
+ return ret;
+}
+
static struct intel_memory_region *
setup_lmem(struct drm_i915_private *dev_priv)
{
@@ -64,6 +106,16 @@ setup_lmem(struct drm_i915_private *dev_priv)
I915_GTT_PAGE_SIZE_4K,
io_start,
&intel_region_lmem_ops);
+ if (!IS_ERR(mem)) {
+ int err;
+
+ err = reserve_lowmem_region(uncore, mem);
+ if (err) {
+ intel_memory_region_put(mem);
+ return ERR_PTR(err);
+ }
+ }
+
if (!IS_ERR(mem)) {
DRM_INFO("Intel graphics LMEM: %pR\n", &mem->region);
DRM_INFO("Intel graphics LMEM IO start: %llx\n",