1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt_gmch.c b/drivers/gpu/drm/i915/gt/intel_ggtt_gmch.c
new file mode 100644
index 000000000000..cc5d345c5e29
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt_gmch.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "intel_ggtt_gmch.h"
+
+#include <drm/drm_print.h>
+#include <drm/intel/intel-gtt.h>
+
+#include <linux/agp_backend.h>
+
+#include "i915_drv.h"
+#include "i915_utils.h"
+#include "intel_gtt.h"
+#include "intel_gt_regs.h"
+#include "intel_gt.h"
+
+static void gmch_ggtt_insert_page(struct i915_address_space *vm,
+				  dma_addr_t addr,
+				  u64 offset,
+				  unsigned int pat_index,
+				  u32 unused)
+{
+	unsigned int flags = (pat_index == I915_CACHE_NONE) ?
+		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
+
+	intel_gmch_gtt_insert_page(addr, offset >> PAGE_SHIFT, flags);
+}
+
+static dma_addr_t gmch_ggtt_read_entry(struct i915_address_space *vm,
+				       u64 offset, bool *is_present, bool *is_local)
+{
+	return intel_gmch_gtt_read_entry(offset >> PAGE_SHIFT,
+					 is_present, is_local);
+}
+
+static void gmch_ggtt_insert_entries(struct i915_address_space *vm,
+				     struct i915_vma_resource *vma_res,
+				     unsigned int pat_index,
+				     u32 unused)
+{
+	unsigned int flags = (pat_index == I915_CACHE_NONE) ?
+		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
+
+	intel_gmch_gtt_insert_sg_entries(vma_res->bi.pages, vma_res->start >> PAGE_SHIFT,
+					 flags);
+}
+
+static void gmch_ggtt_invalidate(struct i915_ggtt *ggtt)
+{
+	intel_gmch_gtt_flush();
+}
+
+static void gmch_ggtt_clear_range(struct i915_address_space *vm,
+				  u64 start, u64 length)
+{
+	intel_gmch_gtt_clear_range(start >> PAGE_SHIFT, length >> PAGE_SHIFT);
+}
+
+static void gmch_ggtt_remove(struct i915_address_space *vm)
+{
+	intel_gmch_remove();
+}
+
+/*
+ * Certain Gen5 chipsets require idling the GPU before unmapping anything from
+ * the GTT when VT-d is enabled.
+ */
+static bool needs_idle_maps(struct drm_i915_private *i915)
+{
+	/*
+	 * Query intel_iommu to see if we need the workaround. Presumably that
+	 * was loaded first.
+	 */
+	if (!i915_vtd_active(i915))
+		return false;
+
+	if (GRAPHICS_VER(i915) == 5 && IS_MOBILE(i915))
+		return true;
+
+	return false;
+}
+
+int intel_ggtt_gmch_probe(struct i915_ggtt *ggtt)
+{
+	struct drm_i915_private *i915 = ggtt->vm.i915;
+	phys_addr_t gmadr_base;
+	int ret;
+
+	ret = intel_gmch_probe(i915->gmch.pdev, to_pci_dev(i915->drm.dev), NULL);
+	if (!ret) {
+		drm_err(&i915->drm, "failed to set up gmch\n");
+		return -EIO;
+	}
+
+	intel_gmch_gtt_get(&ggtt->vm.total, &gmadr_base, &ggtt->mappable_end);
+
+	ggtt->gmadr = DEFINE_RES_MEM(gmadr_base, ggtt->mappable_end);
+
+	ggtt->vm.alloc_pt_dma = alloc_pt_dma;
+	ggtt->vm.alloc_scratch_dma = alloc_pt_dma;
+
+	if (needs_idle_maps(i915)) {
+		drm_notice(&i915->drm,
+			   "Flushing DMA requests before IOMMU unmaps; performance may be degraded\n");
+		ggtt->do_idle_maps = true;
+	}
+
+	ggtt->vm.insert_page = gmch_ggtt_insert_page;
+	ggtt->vm.insert_entries = gmch_ggtt_insert_entries;
+	ggtt->vm.clear_range = gmch_ggtt_clear_range;
+	ggtt->vm.scratch_range = gmch_ggtt_clear_range;
+	ggtt->vm.read_entry = gmch_ggtt_read_entry;
+	ggtt->vm.cleanup = gmch_ggtt_remove;
+
+	ggtt->invalidate = gmch_ggtt_invalidate;
+
+	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;
+	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;
+
+	if (unlikely(ggtt->do_idle_maps))
+		drm_notice(&i915->drm,
+			   "Applying Ironlake quirks for intel_iommu\n");
+
+	return 0;
+}
+
+int intel_ggtt_gmch_enable_hw(struct drm_i915_private *i915)
+{
+	if (!intel_gmch_enable_gtt())
+		return -EIO;
+
+	return 0;
+}
+
+void intel_ggtt_gmch_flush(void)
+{
+	intel_gmch_gtt_flush();
+}