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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2022 Intel Corporation4 */5 6#include "intel_ggtt_gmch.h"7 8#include <drm/intel/intel-gtt.h>9 10#include <linux/agp_backend.h>11 12#include "i915_drv.h"13#include "i915_utils.h"14#include "intel_gtt.h"15#include "intel_gt_regs.h"16#include "intel_gt.h"17 18static void gmch_ggtt_insert_page(struct i915_address_space *vm,19				  dma_addr_t addr,20				  u64 offset,21				  unsigned int pat_index,22				  u32 unused)23{24	unsigned int flags = (pat_index == I915_CACHE_NONE) ?25		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;26 27	intel_gmch_gtt_insert_page(addr, offset >> PAGE_SHIFT, flags);28}29 30static void gmch_ggtt_insert_entries(struct i915_address_space *vm,31				     struct i915_vma_resource *vma_res,32				     unsigned int pat_index,33				     u32 unused)34{35	unsigned int flags = (pat_index == I915_CACHE_NONE) ?36		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;37 38	intel_gmch_gtt_insert_sg_entries(vma_res->bi.pages, vma_res->start >> PAGE_SHIFT,39					 flags);40}41 42static void gmch_ggtt_invalidate(struct i915_ggtt *ggtt)43{44	intel_gmch_gtt_flush();45}46 47static void gmch_ggtt_clear_range(struct i915_address_space *vm,48				  u64 start, u64 length)49{50	intel_gmch_gtt_clear_range(start >> PAGE_SHIFT, length >> PAGE_SHIFT);51}52 53static void gmch_ggtt_remove(struct i915_address_space *vm)54{55	intel_gmch_remove();56}57 58/*59 * Certain Gen5 chipsets require idling the GPU before unmapping anything from60 * the GTT when VT-d is enabled.61 */62static bool needs_idle_maps(struct drm_i915_private *i915)63{64	/*65	 * Query intel_iommu to see if we need the workaround. Presumably that66	 * was loaded first.67	 */68	if (!i915_vtd_active(i915))69		return false;70 71	if (GRAPHICS_VER(i915) == 5 && IS_MOBILE(i915))72		return true;73 74	return false;75}76 77int intel_ggtt_gmch_probe(struct i915_ggtt *ggtt)78{79	struct drm_i915_private *i915 = ggtt->vm.i915;80	phys_addr_t gmadr_base;81	int ret;82 83	ret = intel_gmch_probe(i915->gmch.pdev, to_pci_dev(i915->drm.dev), NULL);84	if (!ret) {85		drm_err(&i915->drm, "failed to set up gmch\n");86		return -EIO;87	}88 89	intel_gmch_gtt_get(&ggtt->vm.total, &gmadr_base, &ggtt->mappable_end);90 91	ggtt->gmadr = DEFINE_RES_MEM(gmadr_base, ggtt->mappable_end);92 93	ggtt->vm.alloc_pt_dma = alloc_pt_dma;94	ggtt->vm.alloc_scratch_dma = alloc_pt_dma;95 96	if (needs_idle_maps(i915)) {97		drm_notice(&i915->drm,98			   "Flushing DMA requests before IOMMU unmaps; performance may be degraded\n");99		ggtt->do_idle_maps = true;100	}101 102	ggtt->vm.insert_page = gmch_ggtt_insert_page;103	ggtt->vm.insert_entries = gmch_ggtt_insert_entries;104	ggtt->vm.clear_range = gmch_ggtt_clear_range;105	ggtt->vm.scratch_range = gmch_ggtt_clear_range;106	ggtt->vm.cleanup = gmch_ggtt_remove;107 108	ggtt->invalidate = gmch_ggtt_invalidate;109 110	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;111	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;112 113	if (unlikely(ggtt->do_idle_maps))114		drm_notice(&i915->drm,115			   "Applying Ironlake quirks for intel_iommu\n");116 117	return 0;118}119 120int intel_ggtt_gmch_enable_hw(struct drm_i915_private *i915)121{122	if (!intel_gmch_enable_gtt())123		return -EIO;124 125	return 0;126}127 128void intel_ggtt_gmch_flush(void)129{130	intel_gmch_gtt_flush();131}132