Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 706 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
new file mode 100644
index 000000000..13944a14e
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -0,0 +1,706 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include <linux/slab.h> /* fault-inject.h is not standalone! */
+
+#include <linux/fault-inject.h>
+#include <linux/sched/mm.h>
+
+#include <drm/drm_cache.h>
+
+#include "gem/i915_gem_internal.h"
+#include "gem/i915_gem_lmem.h"
+#include "i915_reg.h"
+#include "i915_trace.h"
+#include "i915_utils.h"
+#include "intel_gt.h"
+#include "intel_gt_mcr.h"
+#include "intel_gt_print.h"
+#include "intel_gt_regs.h"
+#include "intel_gtt.h"
+
+
+static bool intel_ggtt_update_needs_vtd_wa(struct drm_i915_private *i915)
+{
+	return IS_BROXTON(i915) && i915_vtd_active(i915);
+}
+
+bool intel_vm_no_concurrent_access_wa(struct drm_i915_private *i915)
+{
+	return IS_CHERRYVIEW(i915) || intel_ggtt_update_needs_vtd_wa(i915);
+}
+
+struct drm_i915_gem_object *alloc_pt_lmem(struct i915_address_space *vm, int sz)
+{
+	struct drm_i915_gem_object *obj;
+
+	/*
+	 * To avoid severe over-allocation when dealing with min_page_size
+	 * restrictions, we override that behaviour here by allowing an object
+	 * size and page layout which can be smaller. In practice this should be
+	 * totally fine, since GTT paging structures are not typically inserted
+	 * into the GTT.
+	 *
+	 * Note that we also hit this path for the scratch page, and for this
+	 * case it might need to be 64K, but that should work fine here since we
+	 * used the passed in size for the page size, which should ensure it
+	 * also has the same alignment.
+	 */
+	obj = __i915_gem_object_create_lmem_with_ps(vm->i915, sz, sz,
+						    vm->lmem_pt_obj_flags);
+	/*
+	 * Ensure all paging structures for this vm share the same dma-resv
+	 * object underneath, with the idea that one object_lock() will lock
+	 * them all at once.
+	 */
+	if (!IS_ERR(obj)) {
+		obj->base.resv = i915_vm_resv_get(vm);
+		obj->shares_resv_from = vm;
+	}
+
+	return obj;
+}
+
+struct drm_i915_gem_object *alloc_pt_dma(struct i915_address_space *vm, int sz)
+{
+	struct drm_i915_gem_object *obj;
+
+	if (I915_SELFTEST_ONLY(should_fail(&vm->fault_attr, 1)))
+		i915_gem_shrink_all(vm->i915);
+
+	obj = i915_gem_object_create_internal(vm->i915, sz);
+	/*
+	 * Ensure all paging structures for this vm share the same dma-resv
+	 * object underneath, with the idea that one object_lock() will lock
+	 * them all at once.
+	 */
+	if (!IS_ERR(obj)) {
+		obj->base.resv = i915_vm_resv_get(vm);
+		obj->shares_resv_from = vm;
+	}
+
+	return obj;
+}
+
+int map_pt_dma(struct i915_address_space *vm, struct drm_i915_gem_object *obj)
+{
+	enum i915_map_type type;
+	void *vaddr;
+
+	type = intel_gt_coherent_map_type(vm->gt, obj, true);
+	vaddr = i915_gem_object_pin_map_unlocked(obj, type);
+	if (IS_ERR(vaddr))
+		return PTR_ERR(vaddr);
+
+	i915_gem_object_make_unshrinkable(obj);
+	return 0;
+}
+
+int map_pt_dma_locked(struct i915_address_space *vm, struct drm_i915_gem_object *obj)
+{
+	enum i915_map_type type;
+	void *vaddr;
+
+	type = intel_gt_coherent_map_type(vm->gt, obj, true);
+	vaddr = i915_gem_object_pin_map(obj, type);
+	if (IS_ERR(vaddr))
+		return PTR_ERR(vaddr);
+
+	i915_gem_object_make_unshrinkable(obj);
+	return 0;
+}
+
+static void clear_vm_list(struct list_head *list)
+{
+	struct i915_vma *vma, *vn;
+
+	list_for_each_entry_safe(vma, vn, list, vm_link) {
+		struct drm_i915_gem_object *obj = vma->obj;
+
+		if (!i915_gem_object_get_rcu(obj)) {
+			/*
+			 * Object is dying, but has not yet cleared its
+			 * vma list.
+			 * Unbind the dying vma to ensure our list
+			 * is completely drained. We leave the destruction to
+			 * the object destructor to avoid the vma
+			 * disappearing under it.
+			 */
+			atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
+			WARN_ON(__i915_vma_unbind(vma));
+
+			/* Remove from the unbound list */
+			list_del_init(&vma->vm_link);
+
+			/*
+			 * Delay the vm and vm mutex freeing until the
+			 * object is done with destruction.
+			 */
+			i915_vm_resv_get(vma->vm);
+			vma->vm_ddestroy = true;
+		} else {
+			i915_vma_destroy_locked(vma);
+			i915_gem_object_put(obj);
+		}
+
+	}
+}
+
+static void __i915_vm_close(struct i915_address_space *vm)
+{
+	mutex_lock(&vm->mutex);
+
+	clear_vm_list(&vm->bound_list);
+	clear_vm_list(&vm->unbound_list);
+
+	/* Check for must-fix unanticipated side-effects */
+	GEM_BUG_ON(!list_empty(&vm->bound_list));
+	GEM_BUG_ON(!list_empty(&vm->unbound_list));
+
+	mutex_unlock(&vm->mutex);
+}
+
+/* lock the vm into the current ww, if we lock one, we lock all */
+int i915_vm_lock_objects(struct i915_address_space *vm,
+			 struct i915_gem_ww_ctx *ww)
+{
+	if (vm->scratch[0]->base.resv == &vm->_resv) {
+		return i915_gem_object_lock(vm->scratch[0], ww);
+	} else {
+		struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
+
+		/* We borrowed the scratch page from ggtt, take the top level object */
+		return i915_gem_object_lock(ppgtt->pd->pt.base, ww);
+	}
+}
+
+void i915_address_space_fini(struct i915_address_space *vm)
+{
+	drm_mm_takedown(&vm->mm);
+}
+
+/**
+ * i915_vm_resv_release - Final struct i915_address_space destructor
+ * @kref: Pointer to the &i915_address_space.resv_ref member.
+ *
+ * This function is called when the last lock sharer no longer shares the
+ * &i915_address_space._resv lock, and also if we raced when
+ * destroying a vma by the vma destruction
+ */
+void i915_vm_resv_release(struct kref *kref)
+{
+	struct i915_address_space *vm =
+		container_of(kref, typeof(*vm), resv_ref);
+
+	dma_resv_fini(&vm->_resv);
+	mutex_destroy(&vm->mutex);
+
+	kfree(vm);
+}
+
+static void __i915_vm_release(struct work_struct *work)
+{
+	struct i915_address_space *vm =
+		container_of(work, struct i915_address_space, release_work);
+
+	__i915_vm_close(vm);
+
+	/* Synchronize async unbinds. */
+	i915_vma_resource_bind_dep_sync_all(vm);
+
+	vm->cleanup(vm);
+	i915_address_space_fini(vm);
+
+	i915_vm_resv_put(vm);
+}
+
+void i915_vm_release(struct kref *kref)
+{
+	struct i915_address_space *vm =
+		container_of(kref, struct i915_address_space, ref);
+
+	GEM_BUG_ON(i915_is_ggtt(vm));
+	trace_i915_ppgtt_release(vm);
+
+	queue_work(vm->i915->wq, &vm->release_work);
+}
+
+void i915_address_space_init(struct i915_address_space *vm, int subclass)
+{
+	kref_init(&vm->ref);
+
+	/*
+	 * Special case for GGTT that has already done an early
+	 * kref_init here.
+	 */
+	if (!kref_read(&vm->resv_ref))
+		kref_init(&vm->resv_ref);
+
+	vm->pending_unbind = RB_ROOT_CACHED;
+	INIT_WORK(&vm->release_work, __i915_vm_release);
+
+	/*
+	 * The vm->mutex must be reclaim safe (for use in the shrinker).
+	 * Do a dummy acquire now under fs_reclaim so that any allocation
+	 * attempt holding the lock is immediately reported by lockdep.
+	 */
+	mutex_init(&vm->mutex);
+	lockdep_set_subclass(&vm->mutex, subclass);
+
+	if (!intel_vm_no_concurrent_access_wa(vm->i915)) {
+		i915_gem_shrinker_taints_mutex(vm->i915, &vm->mutex);
+	} else {
+		/*
+		 * CHV + BXT VTD workaround use stop_machine(),
+		 * which is allowed to allocate memory. This means &vm->mutex
+		 * is the outer lock, and in theory we can allocate memory inside
+		 * it through stop_machine().
+		 *
+		 * Add the annotation for this, we use trylock in shrinker.
+		 */
+		mutex_acquire(&vm->mutex.dep_map, 0, 0, _THIS_IP_);
+		might_alloc(GFP_KERNEL);
+		mutex_release(&vm->mutex.dep_map, _THIS_IP_);
+	}
+	dma_resv_init(&vm->_resv);
+
+	GEM_BUG_ON(!vm->total);
+	drm_mm_init(&vm->mm, 0, vm->total);
+
+	memset64(vm->min_alignment, I915_GTT_MIN_ALIGNMENT,
+		 ARRAY_SIZE(vm->min_alignment));
+
+	if (HAS_64K_PAGES(vm->i915)) {
+		vm->min_alignment[INTEL_MEMORY_LOCAL] = I915_GTT_PAGE_SIZE_64K;
+		vm->min_alignment[INTEL_MEMORY_STOLEN_LOCAL] = I915_GTT_PAGE_SIZE_64K;
+	}
+
+	vm->mm.head_node.color = I915_COLOR_UNEVICTABLE;
+
+	INIT_LIST_HEAD(&vm->bound_list);
+	INIT_LIST_HEAD(&vm->unbound_list);
+}
+
+void *__px_vaddr(struct drm_i915_gem_object *p)
+{
+	enum i915_map_type type;
+
+	GEM_BUG_ON(!i915_gem_object_has_pages(p));
+	return page_unpack_bits(p->mm.mapping, &type);
+}
+
+dma_addr_t __px_dma(struct drm_i915_gem_object *p)
+{
+	GEM_BUG_ON(!i915_gem_object_has_pages(p));
+	return sg_dma_address(p->mm.pages->sgl);
+}
+
+struct page *__px_page(struct drm_i915_gem_object *p)
+{
+	GEM_BUG_ON(!i915_gem_object_has_pages(p));
+	return sg_page(p->mm.pages->sgl);
+}
+
+void
+fill_page_dma(struct drm_i915_gem_object *p, const u64 val, unsigned int count)
+{
+	void *vaddr = __px_vaddr(p);
+
+	memset64(vaddr, val, count);
+	drm_clflush_virt_range(vaddr, PAGE_SIZE);
+}
+
+static void poison_scratch_page(struct drm_i915_gem_object *scratch)
+{
+	void *vaddr = __px_vaddr(scratch);
+	u8 val;
+
+	val = 0;
+	if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
+		val = POISON_FREE;
+
+	memset(vaddr, val, scratch->base.size);
+	drm_clflush_virt_range(vaddr, scratch->base.size);
+}
+
+int setup_scratch_page(struct i915_address_space *vm)
+{
+	unsigned long size;
+
+	/*
+	 * In order to utilize 64K pages for an object with a size < 2M, we will
+	 * need to support a 64K scratch page, given that every 16th entry for a
+	 * page-table operating in 64K mode must point to a properly aligned 64K
+	 * region, including any PTEs which happen to point to scratch.
+	 *
+	 * This is only relevant for the 48b PPGTT where we support
+	 * huge-gtt-pages, see also i915_vma_insert(). However, as we share the
+	 * scratch (read-only) between all vm, we create one 64k scratch page
+	 * for all.
+	 */
+	size = I915_GTT_PAGE_SIZE_4K;
+	if (i915_vm_is_4lvl(vm) &&
+	    HAS_PAGE_SIZES(vm->i915, I915_GTT_PAGE_SIZE_64K) &&
+	    !HAS_64K_PAGES(vm->i915))
+		size = I915_GTT_PAGE_SIZE_64K;
+
+	do {
+		struct drm_i915_gem_object *obj;
+
+		obj = vm->alloc_scratch_dma(vm, size);
+		if (IS_ERR(obj))
+			goto skip;
+
+		if (map_pt_dma(vm, obj))
+			goto skip_obj;
+
+		/* We need a single contiguous page for our scratch */
+		if (obj->mm.page_sizes.sg < size)
+			goto skip_obj;
+
+		/* And it needs to be correspondingly aligned */
+		if (__px_dma(obj) & (size - 1))
+			goto skip_obj;
+
+		/*
+		 * Use a non-zero scratch page for debugging.
+		 *
+		 * We want a value that should be reasonably obvious
+		 * to spot in the error state, while also causing a GPU hang
+		 * if executed. We prefer using a clear page in production, so
+		 * should it ever be accidentally used, the effect should be
+		 * fairly benign.
+		 */
+		poison_scratch_page(obj);
+
+		vm->scratch[0] = obj;
+		vm->scratch_order = get_order(size);
+		return 0;
+
+skip_obj:
+		i915_gem_object_put(obj);
+skip:
+		if (size == I915_GTT_PAGE_SIZE_4K)
+			return -ENOMEM;
+
+		size = I915_GTT_PAGE_SIZE_4K;
+	} while (1);
+}
+
+void free_scratch(struct i915_address_space *vm)
+{
+	int i;
+
+	if (!vm->scratch[0])
+		return;
+
+	for (i = 0; i <= vm->top; i++)
+		i915_gem_object_put(vm->scratch[i]);
+}
+
+void gtt_write_workarounds(struct intel_gt *gt)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	struct intel_uncore *uncore = gt->uncore;
+
+	/*
+	 * This function is for gtt related workarounds. This function is
+	 * called on driver load and after a GPU reset, so you can place
+	 * workarounds here even if they get overwritten by GPU reset.
+	 */
+	/* WaIncreaseDefaultTLBEntries:chv,bdw,skl,bxt,kbl,glk,cfl,cnl,icl */
+	if (IS_BROADWELL(i915))
+		intel_uncore_write(uncore,
+				   GEN8_L3_LRA_1_GPGPU,
+				   GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW);
+	else if (IS_CHERRYVIEW(i915))
+		intel_uncore_write(uncore,
+				   GEN8_L3_LRA_1_GPGPU,
+				   GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_CHV);
+	else if (IS_GEN9_LP(i915))
+		intel_uncore_write(uncore,
+				   GEN8_L3_LRA_1_GPGPU,
+				   GEN9_L3_LRA_1_GPGPU_DEFAULT_VALUE_BXT);
+	else if (GRAPHICS_VER(i915) >= 9 && GRAPHICS_VER(i915) <= 11)
+		intel_uncore_write(uncore,
+				   GEN8_L3_LRA_1_GPGPU,
+				   GEN9_L3_LRA_1_GPGPU_DEFAULT_VALUE_SKL);
+
+	/*
+	 * To support 64K PTEs we need to first enable the use of the
+	 * Intermediate-Page-Size(IPS) bit of the PDE field via some magical
+	 * mmio, otherwise the page-walker will simply ignore the IPS bit. This
+	 * shouldn't be needed after GEN10.
+	 *
+	 * 64K pages were first introduced from BDW+, although technically they
+	 * only *work* from gen9+. For pre-BDW we instead have the option for
+	 * 32K pages, but we don't currently have any support for it in our
+	 * driver.
+	 */
+	if (HAS_PAGE_SIZES(i915, I915_GTT_PAGE_SIZE_64K) &&
+	    GRAPHICS_VER(i915) <= 10)
+		intel_uncore_rmw(uncore,
+				 GEN8_GAMW_ECO_DEV_RW_IA,
+				 0,
+				 GAMW_ECO_ENABLE_64K_IPS_FIELD);
+
+	if (IS_GRAPHICS_VER(i915, 8, 11)) {
+		bool can_use_gtt_cache = true;
+
+		/*
+		 * According to the BSpec if we use 2M/1G pages then we also
+		 * need to disable the GTT cache. At least on BDW we can see
+		 * visual corruption when using 2M pages, and not disabling the
+		 * GTT cache.
+		 */
+		if (HAS_PAGE_SIZES(i915, I915_GTT_PAGE_SIZE_2M))
+			can_use_gtt_cache = false;
+
+		/* WaGttCachingOffByDefault */
+		intel_uncore_write(uncore,
+				   HSW_GTT_CACHE_EN,
+				   can_use_gtt_cache ? GTT_CACHE_EN_ALL : 0);
+		gt_WARN_ON_ONCE(gt, can_use_gtt_cache &&
+				intel_uncore_read(uncore,
+						  HSW_GTT_CACHE_EN) == 0);
+	}
+}
+
+static void xelpmp_setup_private_ppat(struct intel_uncore *uncore)
+{
+	intel_uncore_write(uncore, XELPMP_PAT_INDEX(0),
+			   MTL_PPAT_L4_0_WB);
+	intel_uncore_write(uncore, XELPMP_PAT_INDEX(1),
+			   MTL_PPAT_L4_1_WT);
+	intel_uncore_write(uncore, XELPMP_PAT_INDEX(2),
+			   MTL_PPAT_L4_3_UC);
+	intel_uncore_write(uncore, XELPMP_PAT_INDEX(3),
+			   MTL_PPAT_L4_0_WB | MTL_2_COH_1W);
+	intel_uncore_write(uncore, XELPMP_PAT_INDEX(4),
+			   MTL_PPAT_L4_0_WB | MTL_3_COH_2W);
+
+	/*
+	 * Remaining PAT entries are left at the hardware-default
+	 * fully-cached setting
+	 */
+}
+
+static void xelpg_setup_private_ppat(struct intel_gt *gt)
+{
+	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(0),
+				     MTL_PPAT_L4_0_WB);
+	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(1),
+				     MTL_PPAT_L4_1_WT);
+	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(2),
+				     MTL_PPAT_L4_3_UC);
+	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(3),
+				     MTL_PPAT_L4_0_WB | MTL_2_COH_1W);
+	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(4),
+				     MTL_PPAT_L4_0_WB | MTL_3_COH_2W);
+
+	/*
+	 * Remaining PAT entries are left at the hardware-default
+	 * fully-cached setting
+	 */
+}
+
+static void tgl_setup_private_ppat(struct intel_uncore *uncore)
+{
+	/* TGL doesn't support LLC or AGE settings */
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(0), GEN8_PPAT_WB);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(1), GEN8_PPAT_WC);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(2), GEN8_PPAT_WT);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(3), GEN8_PPAT_UC);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(4), GEN8_PPAT_WB);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(5), GEN8_PPAT_WB);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(6), GEN8_PPAT_WB);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(7), GEN8_PPAT_WB);
+}
+
+static void xehp_setup_private_ppat(struct intel_gt *gt)
+{
+	enum forcewake_domains fw;
+	unsigned long flags;
+
+	fw = intel_uncore_forcewake_for_reg(gt->uncore, _MMIO(XEHP_PAT_INDEX(0).reg),
+					    FW_REG_WRITE);
+	intel_uncore_forcewake_get(gt->uncore, fw);
+
+	intel_gt_mcr_lock(gt, &flags);
+	intel_gt_mcr_multicast_write_fw(gt, XEHP_PAT_INDEX(0), GEN8_PPAT_WB);
+	intel_gt_mcr_multicast_write_fw(gt, XEHP_PAT_INDEX(1), GEN8_PPAT_WC);
+	intel_gt_mcr_multicast_write_fw(gt, XEHP_PAT_INDEX(2), GEN8_PPAT_WT);
+	intel_gt_mcr_multicast_write_fw(gt, XEHP_PAT_INDEX(3), GEN8_PPAT_UC);
+	intel_gt_mcr_multicast_write_fw(gt, XEHP_PAT_INDEX(4), GEN8_PPAT_WB);
+	intel_gt_mcr_multicast_write_fw(gt, XEHP_PAT_INDEX(5), GEN8_PPAT_WB);
+	intel_gt_mcr_multicast_write_fw(gt, XEHP_PAT_INDEX(6), GEN8_PPAT_WB);
+	intel_gt_mcr_multicast_write_fw(gt, XEHP_PAT_INDEX(7), GEN8_PPAT_WB);
+	intel_gt_mcr_unlock(gt, flags);
+
+	intel_uncore_forcewake_put(gt->uncore, fw);
+}
+
+static void icl_setup_private_ppat(struct intel_uncore *uncore)
+{
+	intel_uncore_write(uncore,
+			   GEN10_PAT_INDEX(0),
+			   GEN8_PPAT_WB | GEN8_PPAT_LLC);
+	intel_uncore_write(uncore,
+			   GEN10_PAT_INDEX(1),
+			   GEN8_PPAT_WC | GEN8_PPAT_LLCELLC);
+	intel_uncore_write(uncore,
+			   GEN10_PAT_INDEX(2),
+			   GEN8_PPAT_WB | GEN8_PPAT_ELLC_OVERRIDE);
+	intel_uncore_write(uncore,
+			   GEN10_PAT_INDEX(3),
+			   GEN8_PPAT_UC);
+	intel_uncore_write(uncore,
+			   GEN10_PAT_INDEX(4),
+			   GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(0));
+	intel_uncore_write(uncore,
+			   GEN10_PAT_INDEX(5),
+			   GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(1));
+	intel_uncore_write(uncore,
+			   GEN10_PAT_INDEX(6),
+			   GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(2));
+	intel_uncore_write(uncore,
+			   GEN10_PAT_INDEX(7),
+			   GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3));
+}
+
+/*
+ * The GGTT and PPGTT need a private PPAT setup in order to handle cacheability
+ * bits. When using advanced contexts each context stores its own PAT, but
+ * writing this data shouldn't be harmful even in those cases.
+ */
+static void bdw_setup_private_ppat(struct intel_uncore *uncore)
+{
+	struct drm_i915_private *i915 = uncore->i915;
+	u64 pat;
+
+	pat = GEN8_PPAT(0, GEN8_PPAT_WB | GEN8_PPAT_LLC) |	/* for normal objects, no eLLC */
+	      GEN8_PPAT(1, GEN8_PPAT_WC | GEN8_PPAT_LLCELLC) |	/* for something pointing to ptes? */
+	      GEN8_PPAT(3, GEN8_PPAT_UC) |			/* Uncached objects, mostly for scanout */
+	      GEN8_PPAT(4, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(0)) |
+	      GEN8_PPAT(5, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(1)) |
+	      GEN8_PPAT(6, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(2)) |
+	      GEN8_PPAT(7, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3));
+
+	/* for scanout with eLLC */
+	if (GRAPHICS_VER(i915) >= 9)
+		pat |= GEN8_PPAT(2, GEN8_PPAT_WB | GEN8_PPAT_ELLC_OVERRIDE);
+	else
+		pat |= GEN8_PPAT(2, GEN8_PPAT_WT | GEN8_PPAT_LLCELLC);
+
+	intel_uncore_write(uncore, GEN8_PRIVATE_PAT_LO, lower_32_bits(pat));
+	intel_uncore_write(uncore, GEN8_PRIVATE_PAT_HI, upper_32_bits(pat));
+}
+
+static void chv_setup_private_ppat(struct intel_uncore *uncore)
+{
+	u64 pat;
+
+	/*
+	 * Map WB on BDW to snooped on CHV.
+	 *
+	 * Only the snoop bit has meaning for CHV, the rest is
+	 * ignored.
+	 *
+	 * The hardware will never snoop for certain types of accesses:
+	 * - CPU GTT (GMADR->GGTT->no snoop->memory)
+	 * - PPGTT page tables
+	 * - some other special cycles
+	 *
+	 * As with BDW, we also need to consider the following for GT accesses:
+	 * "For GGTT, there is NO pat_sel[2:0] from the entry,
+	 * so RTL will always use the value corresponding to
+	 * pat_sel = 000".
+	 * Which means we must set the snoop bit in PAT entry 0
+	 * in order to keep the global status page working.
+	 */
+
+	pat = GEN8_PPAT(0, CHV_PPAT_SNOOP) |
+	      GEN8_PPAT(1, 0) |
+	      GEN8_PPAT(2, 0) |
+	      GEN8_PPAT(3, 0) |
+	      GEN8_PPAT(4, CHV_PPAT_SNOOP) |
+	      GEN8_PPAT(5, CHV_PPAT_SNOOP) |
+	      GEN8_PPAT(6, CHV_PPAT_SNOOP) |
+	      GEN8_PPAT(7, CHV_PPAT_SNOOP);
+
+	intel_uncore_write(uncore, GEN8_PRIVATE_PAT_LO, lower_32_bits(pat));
+	intel_uncore_write(uncore, GEN8_PRIVATE_PAT_HI, upper_32_bits(pat));
+}
+
+void setup_private_pat(struct intel_gt *gt)
+{
+	struct intel_uncore *uncore = gt->uncore;
+	struct drm_i915_private *i915 = gt->i915;
+
+	GEM_BUG_ON(GRAPHICS_VER(i915) < 8);
+
+	if (gt->type == GT_MEDIA) {
+		xelpmp_setup_private_ppat(gt->uncore);
+		return;
+	}
+
+	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
+		xelpg_setup_private_ppat(gt);
+	else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
+		xehp_setup_private_ppat(gt);
+	else if (GRAPHICS_VER(i915) >= 12)
+		tgl_setup_private_ppat(uncore);
+	else if (GRAPHICS_VER(i915) >= 11)
+		icl_setup_private_ppat(uncore);
+	else if (IS_CHERRYVIEW(i915) || IS_GEN9_LP(i915))
+		chv_setup_private_ppat(uncore);
+	else
+		bdw_setup_private_ppat(uncore);
+}
+
+struct i915_vma *
+__vm_create_scratch_for_read(struct i915_address_space *vm, unsigned long size)
+{
+	struct drm_i915_gem_object *obj;
+	struct i915_vma *vma;
+
+	obj = i915_gem_object_create_internal(vm->i915, PAGE_ALIGN(size));
+	if (IS_ERR(obj))
+		return ERR_CAST(obj);
+
+	i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC);
+
+	vma = i915_vma_instance(obj, vm, NULL);
+	if (IS_ERR(vma)) {
+		i915_gem_object_put(obj);
+		return vma;
+	}
+
+	return vma;
+}
+
+struct i915_vma *
+__vm_create_scratch_for_read_pinned(struct i915_address_space *vm, unsigned long size)
+{
+	struct i915_vma *vma;
+	int err;
+
+	vma = __vm_create_scratch_for_read(vm, size);
+	if (IS_ERR(vma))
+		return vma;
+
+	err = i915_vma_pin(vma, 0, 0,
+			   i915_vma_is_ggtt(vma) ? PIN_GLOBAL : PIN_USER);
+	if (err) {
+		i915_vma_put(vma);
+		return ERR_PTR(err);
+	}
+
+	return vma;
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/mock_gtt.c"
+#endif