1 files changed, 378 insertions, 34 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index dd0ed941441a..08c4e735481b 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -9,24 +9,30 @@
 #include <linux/stop_machine.h>
 
 #include <drm/drm_managed.h>
-#include <drm/i915_drm.h>
-#include <drm/intel-gtt.h>
+#include <drm/drm_print.h>
+#include <drm/intel/i915_drm.h>
+#include <drm/intel/intel-gtt.h>
 
-#include "display/intel_display.h"
 #include "gem/i915_gem_lmem.h"
 
+#include "intel_context.h"
 #include "intel_ggtt_gmch.h"
+#include "intel_gpu_commands.h"
 #include "intel_gt.h"
 #include "intel_gt_regs.h"
 #include "intel_pci_config.h"
+#include "intel_ring.h"
 #include "i915_drv.h"
 #include "i915_pci.h"
+#include "i915_reg.h"
+#include "i915_request.h"
 #include "i915_scatterlist.h"
 #include "i915_utils.h"
 #include "i915_vgpu.h"
 
 #include "intel_gtt.h"
 #include "gen8_ppgtt.h"
+#include "intel_engine_pm.h"
 
 static void i915_ggtt_color_adjust(const struct drm_mm_node *node,
 				   unsigned long color,
@@ -102,11 +108,12 @@ int i915_ggtt_init_hw(struct drm_i915_private *i915)
 /**
  * i915_ggtt_suspend_vm - Suspend the memory mappings for a GGTT or DPT VM
  * @vm: The VM to suspend the mappings for
+ * @evict_all: Evict all VMAs
  *
  * Suspend the memory mappings for all objects mapped to HW via the GGTT or a
  * DPT page table.
  */
-void i915_ggtt_suspend_vm(struct i915_address_space *vm)
+void i915_ggtt_suspend_vm(struct i915_address_space *vm, bool evict_all)
 {
 	struct i915_vma *vma, *vn;
 	int save_skip_rewrite;
@@ -152,7 +159,7 @@ retry:
 			goto retry;
 		}
 
-		if (!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND)) {
+		if (evict_all || !i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND)) {
 			i915_vma_wait_for_bind(vma);
 
 			__i915_vma_evict(vma, false);
@@ -167,13 +174,15 @@ retry:
 	vm->skip_pte_rewrite = save_skip_rewrite;
 
 	mutex_unlock(&vm->mutex);
+
+	drm_WARN_ON(&vm->i915->drm, evict_all && !list_empty(&vm->bound_list));
 }
 
 void i915_ggtt_suspend(struct i915_ggtt *ggtt)
 {
 	struct intel_gt *gt;
 
-	i915_ggtt_suspend_vm(&ggtt->vm);
+	i915_ggtt_suspend_vm(&ggtt->vm, false);
 	ggtt->invalidate(ggtt);
 
 	list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
@@ -190,6 +199,21 @@ void gen6_ggtt_invalidate(struct i915_ggtt *ggtt)
 	spin_unlock_irq(&uncore->lock);
 }
 
+static bool needs_wc_ggtt_mapping(struct drm_i915_private *i915)
+{
+	/*
+	 * On BXT+/ICL+ writes larger than 64 bit to the GTT pagetable range
+	 * will be dropped. For WC mappings in general we have 64 byte burst
+	 * writes when the WC buffer is flushed, so we can't use it, but have to
+	 * resort to an uncached mapping. The WC issue is easily caught by the
+	 * readback check when writing GTT PTE entries.
+	 */
+	if (!IS_GEN9_LP(i915) && GRAPHICS_VER(i915) < 11)
+		return true;
+
+	return false;
+}
+
 static void gen8_ggtt_invalidate(struct i915_ggtt *ggtt)
 {
 	struct intel_uncore *uncore = ggtt->vm.gt->uncore;
@@ -197,26 +221,40 @@ static void gen8_ggtt_invalidate(struct i915_ggtt *ggtt)
 	/*
 	 * Note that as an uncached mmio write, this will flush the
 	 * WCB of the writes into the GGTT before it triggers the invalidate.
+	 *
+	 * Only perform this when GGTT is mapped as WC, see ggtt_probe_common().
 	 */
-	intel_uncore_write_fw(uncore, GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
+	if (needs_wc_ggtt_mapping(ggtt->vm.i915))
+		intel_uncore_write_fw(uncore, GFX_FLSH_CNTL_GEN6,
+				      GFX_FLSH_CNTL_EN);
+}
+
+static void guc_ggtt_ct_invalidate(struct intel_gt *gt)
+{
+	struct intel_uncore *uncore = gt->uncore;
+	intel_wakeref_t wakeref;
+
+	with_intel_runtime_pm_if_active(uncore->rpm, wakeref)
+		intel_guc_invalidate_tlb_guc(gt_to_guc(gt));
 }
 
 static void guc_ggtt_invalidate(struct i915_ggtt *ggtt)
 {
 	struct drm_i915_private *i915 = ggtt->vm.i915;
+	struct intel_gt *gt;
 
 	gen8_ggtt_invalidate(ggtt);
 
-	if (GRAPHICS_VER(i915) >= 12) {
-		struct intel_gt *gt;
-
-		list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
+	list_for_each_entry(gt, &ggtt->gt_list, ggtt_link) {
+		if (intel_guc_tlb_invalidation_is_available(gt_to_guc(gt)))
+			guc_ggtt_ct_invalidate(gt);
+		else if (GRAPHICS_VER(i915) >= 12)
 			intel_uncore_write_fw(gt->uncore,
 					      GEN12_GUC_TLB_INV_CR,
 					      GEN12_GUC_TLB_INV_CR_INVALIDATE);
-	} else {
-		intel_uncore_write_fw(ggtt->vm.gt->uncore,
-				      GEN8_GTCR, GEN8_GTCR_INVALIDATE);
+		else
+			intel_uncore_write_fw(gt->uncore,
+					      GEN8_GTCR, GEN8_GTCR_INVALIDATE);
 	}
 }
 
@@ -252,11 +290,165 @@ u64 gen8_ggtt_pte_encode(dma_addr_t addr,
 	return pte;
 }
 
+static dma_addr_t gen8_ggtt_pte_decode(u64 pte, bool *is_present, bool *is_local)
+{
+	*is_present = pte & GEN8_PAGE_PRESENT;
+	*is_local = pte & GEN12_GGTT_PTE_LM;
+
+	return pte & GEN12_GGTT_PTE_ADDR_MASK;
+}
+
+static bool should_update_ggtt_with_bind(struct i915_ggtt *ggtt)
+{
+	struct intel_gt *gt = ggtt->vm.gt;
+
+	return intel_gt_is_bind_context_ready(gt);
+}
+
+static struct intel_context *gen8_ggtt_bind_get_ce(struct i915_ggtt *ggtt, intel_wakeref_t *wakeref)
+{
+	struct intel_context *ce;
+	struct intel_gt *gt = ggtt->vm.gt;
+
+	if (intel_gt_is_wedged(gt))
+		return NULL;
+
+	ce = gt->engine[BCS0]->bind_context;
+	GEM_BUG_ON(!ce);
+
+	/*
+	 * If the GT is not awake already at this stage then fallback
+	 * to pci based GGTT update otherwise __intel_wakeref_get_first()
+	 * would conflict with fs_reclaim trying to allocate memory while
+	 * doing rpm_resume().
+	 */
+	*wakeref = intel_gt_pm_get_if_awake(gt);
+	if (!*wakeref)
+		return NULL;
+
+	intel_engine_pm_get(ce->engine);
+
+	return ce;
+}
+
+static void gen8_ggtt_bind_put_ce(struct intel_context *ce, intel_wakeref_t wakeref)
+{
+	intel_engine_pm_put(ce->engine);
+	intel_gt_pm_put(ce->engine->gt, wakeref);
+}
+
+static bool gen8_ggtt_bind_ptes(struct i915_ggtt *ggtt, u32 offset,
+				struct sg_table *pages, u32 num_entries,
+				const gen8_pte_t pte)
+{
+	struct i915_sched_attr attr = {};
+	struct intel_gt *gt = ggtt->vm.gt;
+	const gen8_pte_t scratch_pte = ggtt->vm.scratch[0]->encode;
+	struct sgt_iter iter;
+	struct i915_request *rq;
+	struct intel_context *ce;
+	intel_wakeref_t wakeref;
+	u32 *cs;
+
+	if (!num_entries)
+		return true;
+
+	ce = gen8_ggtt_bind_get_ce(ggtt, &wakeref);
+	if (!ce)
+		return false;
+
+	if (pages)
+		iter = __sgt_iter(pages->sgl, true);
+
+	while (num_entries) {
+		int count = 0;
+		dma_addr_t addr;
+		/*
+		 * MI_UPDATE_GTT can update 512 entries in a single command but
+		 * that end up with engine reset, 511 works.
+		 */
+		u32 n_ptes = min_t(u32, 511, num_entries);
+
+		if (mutex_lock_interruptible(&ce->timeline->mutex))
+			goto put_ce;
+
+		intel_context_enter(ce);
+		rq = __i915_request_create(ce, GFP_NOWAIT | GFP_ATOMIC);
+		intel_context_exit(ce);
+		if (IS_ERR(rq)) {
+			GT_TRACE(gt, "Failed to get bind request\n");
+			mutex_unlock(&ce->timeline->mutex);
+			goto put_ce;
+		}
+
+		cs = intel_ring_begin(rq, 2 * n_ptes + 2);
+		if (IS_ERR(cs)) {
+			GT_TRACE(gt, "Failed to ring space for GGTT bind\n");
+			i915_request_set_error_once(rq, PTR_ERR(cs));
+			/* once a request is created, it must be queued */
+			goto queue_err_rq;
+		}
+
+		*cs++ = MI_UPDATE_GTT | (2 * n_ptes);
+		*cs++ = offset << 12;
+
+		if (pages) {
+			for_each_sgt_daddr_next(addr, iter) {
+				if (count == n_ptes)
+					break;
+				*cs++ = lower_32_bits(pte | addr);
+				*cs++ = upper_32_bits(pte | addr);
+				count++;
+			}
+			/* fill remaining with scratch pte, if any */
+			if (count < n_ptes) {
+				memset64((u64 *)cs, scratch_pte,
+					 n_ptes - count);
+				cs += (n_ptes - count) * 2;
+			}
+		} else {
+			memset64((u64 *)cs, pte, n_ptes);
+			cs += n_ptes * 2;
+		}
+
+		intel_ring_advance(rq, cs);
+queue_err_rq:
+		i915_request_get(rq);
+		__i915_request_commit(rq);
+		__i915_request_queue(rq, &attr);
+
+		mutex_unlock(&ce->timeline->mutex);
+		/* This will break if the request is complete or after engine reset */
+		i915_request_wait(rq, 0, MAX_SCHEDULE_TIMEOUT);
+		if (rq->fence.error)
+			goto err_rq;
+
+		i915_request_put(rq);
+
+		num_entries -= n_ptes;
+		offset += n_ptes;
+	}
+
+	gen8_ggtt_bind_put_ce(ce, wakeref);
+	return true;
+
+err_rq:
+	i915_request_put(rq);
+put_ce:
+	gen8_ggtt_bind_put_ce(ce, wakeref);
+	return false;
+}
+
 static void gen8_set_pte(void __iomem *addr, gen8_pte_t pte)
 {
 	writeq(pte, addr);
 }
 
+static gen8_pte_t gen8_get_pte(void __iomem *addr)
+{
+	return readq(addr);
+}
+
 static void gen8_ggtt_insert_page(struct i915_address_space *vm,
 				  dma_addr_t addr,
 				  u64 offset,
@@ -272,6 +464,31 @@ static void gen8_ggtt_insert_page(struct i915_address_space *vm,
 	ggtt->invalidate(ggtt);
 }
 
+static dma_addr_t gen8_ggtt_read_entry(struct i915_address_space *vm,
+				       u64 offset, bool *is_present, bool *is_local)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	gen8_pte_t __iomem *pte =
+		(gen8_pte_t __iomem *)ggtt->gsm + offset / I915_GTT_PAGE_SIZE;
+
+	return ggtt->vm.pte_decode(gen8_get_pte(pte), is_present, is_local);
+}
+
+static void gen8_ggtt_insert_page_bind(struct i915_address_space *vm,
+				       dma_addr_t addr, u64 offset,
+				       unsigned int pat_index, u32 flags)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	gen8_pte_t pte;
+
+	pte = ggtt->vm.pte_encode(addr, pat_index, flags);
+	if (should_update_ggtt_with_bind(i915_vm_to_ggtt(vm)) &&
+	    gen8_ggtt_bind_ptes(ggtt, offset, NULL, 1, pte))
+		return ggtt->invalidate(ggtt);
+
+	gen8_ggtt_insert_page(vm, addr, offset, pat_index, flags);
+}
+
 static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
 				     struct i915_vma_resource *vma_res,
 				     unsigned int pat_index,
@@ -311,6 +528,50 @@ static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
 	ggtt->invalidate(ggtt);
 }
 
+static bool __gen8_ggtt_insert_entries_bind(struct i915_address_space *vm,
+					    struct i915_vma_resource *vma_res,
+					    unsigned int pat_index, u32 flags)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	gen8_pte_t scratch_pte = vm->scratch[0]->encode;
+	gen8_pte_t pte_encode;
+	u64 start, end;
+
+	pte_encode = ggtt->vm.pte_encode(0, pat_index, flags);
+	start = (vma_res->start - vma_res->guard) / I915_GTT_PAGE_SIZE;
+	end = start + vma_res->guard / I915_GTT_PAGE_SIZE;
+	if (!gen8_ggtt_bind_ptes(ggtt, start, NULL, end - start, scratch_pte))
+		goto err;
+
+	start = end;
+	end += (vma_res->node_size + vma_res->guard) / I915_GTT_PAGE_SIZE;
+	if (!gen8_ggtt_bind_ptes(ggtt, start, vma_res->bi.pages,
+	      vma_res->node_size / I915_GTT_PAGE_SIZE, pte_encode))
+		goto err;
+
+	start += vma_res->node_size / I915_GTT_PAGE_SIZE;
+	if (!gen8_ggtt_bind_ptes(ggtt, start, NULL, end - start, scratch_pte))
+		goto err;
+
+	return true;
+
+err:
+	return false;
+}
+
+static void gen8_ggtt_insert_entries_bind(struct i915_address_space *vm,
+					  struct i915_vma_resource *vma_res,
+					  unsigned int pat_index, u32 flags)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+
+	if (should_update_ggtt_with_bind(i915_vm_to_ggtt(vm)) &&
+	    __gen8_ggtt_insert_entries_bind(vm, vma_res, pat_index, flags))
+		return ggtt->invalidate(ggtt);
+
+	gen8_ggtt_insert_entries(vm, vma_res, pat_index, flags);
+}
+
 static void gen8_ggtt_clear_range(struct i915_address_space *vm,
 				  u64 start, u64 length)
 {
@@ -332,6 +593,27 @@ static void gen8_ggtt_clear_range(struct i915_address_space *vm,
 		gen8_set_pte(&gtt_base[i], scratch_pte);
 }
 
+static void gen8_ggtt_scratch_range_bind(struct i915_address_space *vm,
+					 u64 start, u64 length)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	unsigned int first_entry = start / I915_GTT_PAGE_SIZE;
+	unsigned int num_entries = length / I915_GTT_PAGE_SIZE;
+	const gen8_pte_t scratch_pte = vm->scratch[0]->encode;
+	const int max_entries = ggtt_total_entries(ggtt) - first_entry;
+
+	if (WARN(num_entries > max_entries,
+		 "First entry = %d; Num entries = %d (max=%d)\n",
+		 first_entry, num_entries, max_entries))
+		num_entries = max_entries;
+
+	if (should_update_ggtt_with_bind(ggtt) && gen8_ggtt_bind_ptes(ggtt, first_entry,
+	     NULL, num_entries, scratch_pte))
+		return ggtt->invalidate(ggtt);
+
+	gen8_ggtt_clear_range(vm, start, length);
+}
+
 static void gen6_ggtt_insert_page(struct i915_address_space *vm,
 				  dma_addr_t addr,
 				  u64 offset,
@@ -347,6 +629,17 @@ static void gen6_ggtt_insert_page(struct i915_address_space *vm,
 	ggtt->invalidate(ggtt);
 }
 
+static dma_addr_t gen6_ggtt_read_entry(struct i915_address_space *vm,
+				       u64 offset,
+				       bool *is_present, bool *is_local)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	gen6_pte_t __iomem *pte =
+		(gen6_pte_t __iomem *)ggtt->gsm + offset / I915_GTT_PAGE_SIZE;
+
+	return vm->pte_decode(ioread32(pte), is_present, is_local);
+}
+
 /*
  * Binds an object into the global gtt with the specified cache level.
  * The object will be accessible to the GPU via commands whose operands
@@ -511,20 +804,39 @@ void intel_ggtt_unbind_vma(struct i915_address_space *vm,
 	vm->clear_range(vm, vma_res->start, vma_res->vma_size);
 }
 
+dma_addr_t intel_ggtt_read_entry(struct i915_address_space *vm,
+				 u64 offset, bool *is_present, bool *is_local)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+
+	return ggtt->vm.read_entry(vm, offset, is_present, is_local);
+}
+
+/*
+ * Reserve the top of the GuC address space for firmware images. Addresses
+ * beyond GUC_GGTT_TOP in the GuC address space are inaccessible by GuC,
+ * which makes for a suitable range to hold GuC/HuC firmware images if the
+ * size of the GGTT is 4G. However, on a 32-bit platform the size of the GGTT
+ * is limited to 2G, which is less than GUC_GGTT_TOP, but we reserve a chunk
+ * of the same size anyway, which is far more than needed, to keep the logic
+ * in uc_fw_ggtt_offset() simple.
+ */
+#define GUC_TOP_RESERVE_SIZE (SZ_4G - GUC_GGTT_TOP)
+
 static int ggtt_reserve_guc_top(struct i915_ggtt *ggtt)
 {
-	u64 size;
+	u64 offset;
 	int ret;
 
 	if (!intel_uc_uses_guc(&ggtt->vm.gt->uc))
 		return 0;
 
-	GEM_BUG_ON(ggtt->vm.total <= GUC_GGTT_TOP);
-	size = ggtt->vm.total - GUC_GGTT_TOP;
+	GEM_BUG_ON(ggtt->vm.total <= GUC_TOP_RESERVE_SIZE);
+	offset = ggtt->vm.total - GUC_TOP_RESERVE_SIZE;
 
-	ret = i915_gem_gtt_reserve(&ggtt->vm, NULL, &ggtt->uc_fw, size,
-				   GUC_GGTT_TOP, I915_COLOR_UNEVICTABLE,
-				   PIN_NOEVICT);
+	ret = i915_gem_gtt_reserve(&ggtt->vm, NULL, &ggtt->uc_fw,
+				   GUC_TOP_RESERVE_SIZE, offset,
+				   I915_COLOR_UNEVICTABLE, PIN_NOEVICT);
 	if (ret)
 		drm_dbg(&ggtt->vm.i915->drm,
 			"Failed to reserve top of GGTT for GuC\n");
@@ -883,25 +1195,26 @@ static unsigned int gen6_gttadr_offset(struct drm_i915_private *i915)
 static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size)
 {
 	struct drm_i915_private *i915 = ggtt->vm.i915;
+	struct intel_uncore *uncore = ggtt->vm.gt->uncore;
 	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 	phys_addr_t phys_addr;
 	u32 pte_flags;
 	int ret;
 
 	GEM_WARN_ON(pci_resource_len(pdev, GEN4_GTTMMADR_BAR) != gen6_gttmmadr_size(i915));
-	phys_addr = pci_resource_start(pdev, GEN4_GTTMMADR_BAR) + gen6_gttadr_offset(i915);
 
-	/*
-	 * On BXT+/ICL+ writes larger than 64 bit to the GTT pagetable range
-	 * will be dropped. For WC mappings in general we have 64 byte burst
-	 * writes when the WC buffer is flushed, so we can't use it, but have to
-	 * resort to an uncached mapping. The WC issue is easily caught by the
-	 * readback check when writing GTT PTE entries.
-	 */
-	if (IS_GEN9_LP(i915) || GRAPHICS_VER(i915) >= 11)
-		ggtt->gsm = ioremap(phys_addr, size);
-	else
+	if (i915_direct_stolen_access(i915)) {
+		drm_dbg(&i915->drm, "Using direct GSM access\n");
+		phys_addr = intel_uncore_read64(uncore, GEN6_GSMBASE) & GEN11_BDSM_MASK;
+	} else {
+		phys_addr = pci_resource_start(pdev, GEN4_GTTMMADR_BAR) + gen6_gttadr_offset(i915);
+	}
+
+	if (needs_wc_ggtt_mapping(i915))
 		ggtt->gsm = ioremap_wc(phys_addr, size);
+	else
+		ggtt->gsm = ioremap(phys_addr, size);
+
 	if (!ggtt->gsm) {
 		drm_err(&i915->drm, "Failed to map the ggtt page table\n");
 		return -ENOMEM;
@@ -975,6 +1288,7 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
 	ggtt->vm.scratch_range = gen8_ggtt_clear_range;
 
 	ggtt->vm.insert_entries = gen8_ggtt_insert_entries;
+	ggtt->vm.read_entry = gen8_ggtt_read_entry;
 
 	/*
 	 * Serialize GTT updates with aperture access on BXT if VT-d is on,
@@ -997,7 +1311,18 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
 			I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
 	}
 
-	if (intel_uc_wants_guc(&ggtt->vm.gt->uc))
+	if (i915_ggtt_require_binder(i915)) {
+		ggtt->vm.scratch_range = gen8_ggtt_scratch_range_bind;
+		ggtt->vm.insert_page = gen8_ggtt_insert_page_bind;
+		ggtt->vm.insert_entries = gen8_ggtt_insert_entries_bind;
+		/*
+		 * On GPU is hung, we might bind VMAs for error capture.
+		 * Fallback to CPU GGTT updates in that case.
+		 */
+		ggtt->vm.raw_insert_page = gen8_ggtt_insert_page;
+	}
+
+	if (intel_uc_wants_guc_submission(&ggtt->vm.gt->uc))
 		ggtt->invalidate = guc_ggtt_invalidate;
 	else
 		ggtt->invalidate = gen8_ggtt_invalidate;
@@ -1010,6 +1335,8 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
 	else
 		ggtt->vm.pte_encode = gen8_ggtt_pte_encode;
 
+	ggtt->vm.pte_decode = gen8_ggtt_pte_decode;
+
 	return ggtt_probe_common(ggtt, size);
 }
 
@@ -1109,6 +1436,14 @@ static u64 iris_pte_encode(dma_addr_t addr,
 	return pte;
 }
 
+static dma_addr_t gen6_pte_decode(u64 pte, bool *is_present, bool *is_local)
+{
+	*is_present = pte & GEN6_PTE_VALID;
+	*is_local = false;
+
+	return ((pte & 0xff0) << 28) | (pte & ~0xfff);
+}
+
 static int gen6_gmch_probe(struct i915_ggtt *ggtt)
 {
 	struct drm_i915_private *i915 = ggtt->vm.i915;
@@ -1147,6 +1482,7 @@ static int gen6_gmch_probe(struct i915_ggtt *ggtt)
 	ggtt->vm.scratch_range = gen6_ggtt_clear_range;
 	ggtt->vm.insert_page = gen6_ggtt_insert_page;
 	ggtt->vm.insert_entries = gen6_ggtt_insert_entries;
+	ggtt->vm.read_entry = gen6_ggtt_read_entry;
 	ggtt->vm.cleanup = gen6_gmch_remove;
 
 	ggtt->invalidate = gen6_ggtt_invalidate;
@@ -1162,6 +1498,8 @@ static int gen6_gmch_probe(struct i915_ggtt *ggtt)
 	else
 		ggtt->vm.pte_encode = snb_pte_encode;
 
+	ggtt->vm.pte_decode = gen6_pte_decode;
+
 	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;
 	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;
 
@@ -1267,6 +1605,7 @@ int i915_ggtt_enable_hw(struct drm_i915_private *i915)
 /**
  * i915_ggtt_resume_vm - Restore the memory mappings for a GGTT or DPT VM
  * @vm: The VM to restore the mappings for
+ * @all_evicted: Were all VMAs expected to be evicted on suspend?
  *
  * Restore the memory mappings for all objects mapped to HW via the GGTT or a
  * DPT page table.
@@ -1274,13 +1613,18 @@ int i915_ggtt_enable_hw(struct drm_i915_private *i915)
  * Returns %true if restoring the mapping for any object that was in a write
  * domain before suspend.
  */
-bool i915_ggtt_resume_vm(struct i915_address_space *vm)
+bool i915_ggtt_resume_vm(struct i915_address_space *vm, bool all_evicted)
 {
 	struct i915_vma *vma;
 	bool write_domain_objs = false;
 
 	drm_WARN_ON(&vm->i915->drm, !vm->is_ggtt && !vm->is_dpt);
 
+	if (all_evicted) {
+		drm_WARN_ON(&vm->i915->drm, !list_empty(&vm->bound_list));
+		return false;
+	}
+
 	/* First fill our portion of the GTT with scratch pages */
 	vm->clear_range(vm, 0, vm->total);
 
@@ -1320,7 +1664,7 @@ void i915_ggtt_resume(struct i915_ggtt *ggtt)
 	list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
 		intel_gt_check_and_clear_faults(gt);
 
-	flush = i915_ggtt_resume_vm(&ggtt->vm);
+	flush = i915_ggtt_resume_vm(&ggtt->vm, false);
 
 	if (drm_mm_node_allocated(&ggtt->error_capture))
 		ggtt->vm.scratch_range(&ggtt->vm, ggtt->error_capture.start,