[PATCH 0/4] dicsrete card 64K page support

[PATCH 0/4] dicsrete card 64K page support

[Robert Beckett]

This series continues support for 64K pages for discrete cards.
It supersedes the 64K patches from https://patchwork.freedesktop.org/series/95686/#rev4
Changes since that series:

- set min alignment for DG2 to 2MB in i915_address_space_init
- replace coloring with simpler 2MB VA alignment for lmem buffers
	- enforce alignment to 2MB for lmem objects on DG2 in i915_vma_insert
	- expand vma reservation to round up to 2MB on DG2 in i915_vma_insert
- add alignment test


Matthew Auld (3):
  drm/i915: enforce min GTT alignment for discrete cards
  drm/i915: support 64K GTT pages for discrete cards
  drm/i915/uapi: document behaviour for DG2 64K support

Robert Beckett (1):
  drm/i915: add gtt misalignment test

 .../gpu/drm/i915/gem/selftests/huge_pages.c   |  60 +++++
 .../i915/gem/selftests/i915_gem_client_blt.c  |  23 +-
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c          | 109 ++++++++-
 drivers/gpu/drm/i915/gt/intel_gtt.c           |  14 ++
 drivers/gpu/drm/i915/gt/intel_gtt.h           |  12 +
 drivers/gpu/drm/i915/gt/intel_ppgtt.c         |   1 +
 drivers/gpu/drm/i915/i915_vma.c               |  14 ++
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 226 +++++++++++++++---
 include/uapi/drm/i915_drm.h                   |  44 +++-
 9 files changed, 454 insertions(+), 49 deletions(-)

-- 
2.25.1

[Intel-gfx] [PATCH 0/4] dicsrete card 64K page support

[Robert Beckett]

This series continues support for 64K pages for discrete cards.
It supersedes the 64K patches from https://patchwork.freedesktop.org/series/95686/#rev4
Changes since that series:

- set min alignment for DG2 to 2MB in i915_address_space_init
- replace coloring with simpler 2MB VA alignment for lmem buffers
	- enforce alignment to 2MB for lmem objects on DG2 in i915_vma_insert
	- expand vma reservation to round up to 2MB on DG2 in i915_vma_insert
- add alignment test


Matthew Auld (3):
  drm/i915: enforce min GTT alignment for discrete cards
  drm/i915: support 64K GTT pages for discrete cards
  drm/i915/uapi: document behaviour for DG2 64K support

Robert Beckett (1):
  drm/i915: add gtt misalignment test

 .../gpu/drm/i915/gem/selftests/huge_pages.c   |  60 +++++
 .../i915/gem/selftests/i915_gem_client_blt.c  |  23 +-
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c          | 109 ++++++++-
 drivers/gpu/drm/i915/gt/intel_gtt.c           |  14 ++
 drivers/gpu/drm/i915/gt/intel_gtt.h           |  12 +
 drivers/gpu/drm/i915/gt/intel_ppgtt.c         |   1 +
 drivers/gpu/drm/i915/i915_vma.c               |  14 ++
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 226 +++++++++++++++---
 include/uapi/drm/i915_drm.h                   |  44 +++-
 9 files changed, 454 insertions(+), 49 deletions(-)

-- 
2.25.1

[PATCH 1/4] drm/i915: enforce min GTT alignment for discrete cards

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

For local-memory objects we need to align the GTT addresses
to 64K, both for the ppgtt and ggtt.

We need to support vm->min_alignment > 4K, depending
on the vm itself and the type of object we are inserting.
With this in mind update the GTT selftests to take this
into account.

For DG2 we further align and pad lmem object GTT addresses
to 2MB to ensure PDEs contain consistent page sizes as
required by the HW.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 .../i915/gem/selftests/i915_gem_client_blt.c  | 23 +++--
 drivers/gpu/drm/i915/gt/intel_gtt.c           | 14 +++
 drivers/gpu/drm/i915/gt/intel_gtt.h           |  9 ++
 drivers/gpu/drm/i915/i915_vma.c               | 14 +++
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 96 ++++++++++++-------
 5 files changed, 115 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
index c08f766e6e15..7fee95a65414 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
@@ -39,6 +39,7 @@ struct tiled_blits {
 	struct blit_buffer scratch;
 	struct i915_vma *batch;
 	u64 hole;
+	u64 align;
 	u32 width;
 	u32 height;
 };
@@ -410,14 +411,21 @@ tiled_blits_create(struct intel_engine_cs *engine, struct rnd_state *prng)
 		goto err_free;
 	}
 
-	hole_size = 2 * PAGE_ALIGN(WIDTH * HEIGHT * 4);
+	t->align = I915_GTT_PAGE_SIZE_2M; /* XXX worst case, derive from vm! */
+	t->align = max(t->align,
+		       i915_vm_min_alignment(t->ce->vm, INTEL_MEMORY_LOCAL));
+	t->align = max(t->align,
+		       i915_vm_min_alignment(t->ce->vm, INTEL_MEMORY_SYSTEM));
+
+	hole_size = 2 * round_up(WIDTH * HEIGHT * 4, t->align);
 	hole_size *= 2; /* room to maneuver */
-	hole_size += 2 * I915_GTT_MIN_ALIGNMENT;
+	hole_size += 2 * t->align; /* padding on either side */
 
 	mutex_lock(&t->ce->vm->mutex);
 	memset(&hole, 0, sizeof(hole));
 	err = drm_mm_insert_node_in_range(&t->ce->vm->mm, &hole,
-					  hole_size, 0, I915_COLOR_UNEVICTABLE,
+					  hole_size, t->align,
+					  I915_COLOR_UNEVICTABLE,
 					  0, U64_MAX,
 					  DRM_MM_INSERT_BEST);
 	if (!err)
@@ -428,7 +436,7 @@ tiled_blits_create(struct intel_engine_cs *engine, struct rnd_state *prng)
 		goto err_put;
 	}
 
-	t->hole = hole.start + I915_GTT_MIN_ALIGNMENT;
+	t->hole = hole.start + t->align;
 	pr_info("Using hole at %llx\n", t->hole);
 
 	err = tiled_blits_create_buffers(t, WIDTH, HEIGHT, prng);
@@ -455,7 +463,7 @@ static void tiled_blits_destroy(struct tiled_blits *t)
 static int tiled_blits_prepare(struct tiled_blits *t,
 			       struct rnd_state *prng)
 {
-	u64 offset = PAGE_ALIGN(t->width * t->height * 4);
+	u64 offset = round_up(t->width * t->height * 4, t->align);
 	u32 *map;
 	int err;
 	int i;
@@ -486,8 +494,7 @@ static int tiled_blits_prepare(struct tiled_blits *t,
 
 static int tiled_blits_bounce(struct tiled_blits *t, struct rnd_state *prng)
 {
-	u64 offset =
-		round_up(t->width * t->height * 4, 2 * I915_GTT_MIN_ALIGNMENT);
+	u64 offset = round_up(t->width * t->height * 4, 2 * t->align);
 	int err;
 
 	/* We want to check position invariant tiling across GTT eviction */
@@ -500,7 +507,7 @@ static int tiled_blits_bounce(struct tiled_blits *t, struct rnd_state *prng)
 
 	/* Reposition so that we overlap the old addresses, and slightly off */
 	err = tiled_blit(t,
-			 &t->buffers[2], t->hole + I915_GTT_MIN_ALIGNMENT,
+			 &t->buffers[2], t->hole + t->align,
 			 &t->buffers[1], t->hole + 3 * offset / 2);
 	if (err)
 		return err;
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index a94be0306464..156852dcf33a 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -219,6 +219,20 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
 
 	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)) {
+		if (IS_DG2(vm->i915)) {
+			vm->min_alignment[INTEL_MEMORY_LOCAL] = I915_GTT_PAGE_SIZE_2M;
+			vm->min_alignment[INTEL_MEMORY_STOLEN_LOCAL] = I915_GTT_PAGE_SIZE_2M;
+		} else {
+			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);
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index 177b42b935a1..b24a496c854e 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -28,6 +28,8 @@
 #include "gt/intel_reset.h"
 #include "i915_selftest.h"
 #include "i915_vma_types.h"
+#include "i915_params.h"
+#include "intel_memory_region.h"
 
 #define I915_GFP_ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
 
@@ -221,6 +223,7 @@ struct i915_address_space {
 	struct device *dma;
 	u64 total;		/* size addr space maps (ex. 2GB for ggtt) */
 	u64 reserved;		/* size addr space reserved */
+	u64 min_alignment[INTEL_MEMORY_STOLEN_LOCAL + 1];
 
 	unsigned int bind_async_flags;
 
@@ -379,6 +382,12 @@ i915_vm_has_scratch_64K(struct i915_address_space *vm)
 	return vm->scratch_order == get_order(I915_GTT_PAGE_SIZE_64K);
 }
 
+static inline u64 i915_vm_min_alignment(struct i915_address_space *vm,
+					enum intel_memory_type type)
+{
+	return vm->min_alignment[type];
+}
+
 static inline bool
 i915_vm_has_cache_coloring(struct i915_address_space *vm)
 {
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index be208a8f1ed0..f354e465a6cd 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -694,6 +694,20 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 	}
 
 	color = 0;
+
+	if (HAS_64K_PAGES(vma->vm->i915) && i915_gem_object_is_lmem(vma->obj)) {
+		alignment = max(alignment, I915_GTT_PAGE_SIZE_64K);
+		/*
+		 * DG2 can not have different sized pages in any given PDE (2MB range).
+		 * Keeping things simple, we force any lmem object to reserve
+		 * 2MB chunks, preventing any smaller pages being used alongside
+		 */
+		if (IS_DG2(vma->vm->i915)) {
+			alignment = max(alignment, I915_GTT_PAGE_SIZE_2M);
+			size = round_up(size, I915_GTT_PAGE_SIZE_2M);
+		}
+	}
+
 	if (i915_vm_has_cache_coloring(vma->vm))
 		color = vma->obj->cache_level;
 
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 357ced0b88e7..fea031b4ec4f 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -237,6 +237,8 @@ static int lowlevel_hole(struct i915_address_space *vm,
 			 u64 hole_start, u64 hole_end,
 			 unsigned long end_time)
 {
+	const unsigned int min_alignment =
+		i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
 	I915_RND_STATE(seed_prng);
 	struct i915_vma *mock_vma;
 	unsigned int size;
@@ -250,9 +252,10 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		I915_RND_SUBSTATE(prng, seed_prng);
 		struct drm_i915_gem_object *obj;
 		unsigned int *order, count, n;
-		u64 hole_size;
+		u64 hole_size, aligned_size;
 
-		hole_size = (hole_end - hole_start) >> size;
+		aligned_size = max_t(u32, ilog2(min_alignment), size);
+		hole_size = (hole_end - hole_start) >> aligned_size;
 		if (hole_size > KMALLOC_MAX_SIZE / sizeof(u32))
 			hole_size = KMALLOC_MAX_SIZE / sizeof(u32);
 		count = hole_size >> 1;
@@ -273,8 +276,8 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		}
 		GEM_BUG_ON(!order);
 
-		GEM_BUG_ON(count * BIT_ULL(size) > vm->total);
-		GEM_BUG_ON(hole_start + count * BIT_ULL(size) > hole_end);
+		GEM_BUG_ON(count * BIT_ULL(aligned_size) > vm->total);
+		GEM_BUG_ON(hole_start + count * BIT_ULL(aligned_size) > hole_end);
 
 		/* Ignore allocation failures (i.e. don't report them as
 		 * a test failure) as we are purposefully allocating very
@@ -297,10 +300,10 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		}
 
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 			intel_wakeref_t wakeref;
 
-			GEM_BUG_ON(addr + BIT_ULL(size) > vm->total);
+			GEM_BUG_ON(addr + BIT_ULL(aligned_size) > vm->total);
 
 			if (igt_timeout(end_time,
 					"%s timed out before %d/%d\n",
@@ -343,7 +346,7 @@ static int lowlevel_hole(struct i915_address_space *vm,
 			}
 
 			mock_vma->pages = obj->mm.pages;
-			mock_vma->node.size = BIT_ULL(size);
+			mock_vma->node.size = BIT_ULL(aligned_size);
 			mock_vma->node.start = addr;
 
 			with_intel_runtime_pm(vm->gt->uncore->rpm, wakeref)
@@ -354,7 +357,7 @@ static int lowlevel_hole(struct i915_address_space *vm,
 
 		i915_random_reorder(order, count, &prng);
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 			intel_wakeref_t wakeref;
 
 			GEM_BUG_ON(addr + BIT_ULL(size) > vm->total);
@@ -398,8 +401,10 @@ static int fill_hole(struct i915_address_space *vm,
 {
 	const u64 hole_size = hole_end - hole_start;
 	struct drm_i915_gem_object *obj;
+	const unsigned int min_alignment =
+		i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
 	const unsigned long max_pages =
-		min_t(u64, ULONG_MAX - 1, hole_size/2 >> PAGE_SHIFT);
+		min_t(u64, ULONG_MAX - 1, (hole_size / 2) >> ilog2(min_alignment));
 	const unsigned long max_step = max(int_sqrt(max_pages), 2UL);
 	unsigned long npages, prime, flags;
 	struct i915_vma *vma;
@@ -440,14 +445,17 @@ static int fill_hole(struct i915_address_space *vm,
 
 				offset = p->offset;
 				list_for_each_entry(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					err = i915_vma_pin(vma, 0, 0, offset | flags);
@@ -469,22 +477,25 @@ static int fill_hole(struct i915_address_space *vm,
 					i915_vma_unpin(vma);
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					if (!drm_mm_node_allocated(&vma->node) ||
@@ -505,22 +516,25 @@ static int fill_hole(struct i915_address_space *vm,
 					}
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry_reverse(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					err = i915_vma_pin(vma, 0, 0, offset | flags);
@@ -542,22 +556,25 @@ static int fill_hole(struct i915_address_space *vm,
 					i915_vma_unpin(vma);
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry_reverse(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					if (!drm_mm_node_allocated(&vma->node) ||
@@ -578,9 +595,9 @@ static int fill_hole(struct i915_address_space *vm,
 					}
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 			}
@@ -610,6 +627,7 @@ static int walk_hole(struct i915_address_space *vm,
 	const u64 hole_size = hole_end - hole_start;
 	const unsigned long max_pages =
 		min_t(u64, ULONG_MAX - 1, hole_size >> PAGE_SHIFT);
+	unsigned long min_alignment;
 	unsigned long flags;
 	u64 size;
 
@@ -619,6 +637,8 @@ static int walk_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	for_each_prime_number_from(size, 1, max_pages) {
 		struct drm_i915_gem_object *obj;
 		struct i915_vma *vma;
@@ -637,7 +657,7 @@ static int walk_hole(struct i915_address_space *vm,
 
 		for (addr = hole_start;
 		     addr + obj->base.size < hole_end;
-		     addr += obj->base.size) {
+		     addr += round_up(obj->base.size, min_alignment)) {
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
 				pr_err("%s bind failed at %llx + %llx [hole %llx- %llx] with err=%d\n",
@@ -689,6 +709,7 @@ static int pot_hole(struct i915_address_space *vm,
 {
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
+	unsigned int min_alignment;
 	unsigned long flags;
 	unsigned int pot;
 	int err = 0;
@@ -697,6 +718,8 @@ static int pot_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	obj = i915_gem_object_create_internal(vm->i915, 2 * I915_GTT_PAGE_SIZE);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);
@@ -709,13 +732,13 @@ static int pot_hole(struct i915_address_space *vm,
 
 	/* Insert a pair of pages across every pot boundary within the hole */
 	for (pot = fls64(hole_end - 1) - 1;
-	     pot > ilog2(2 * I915_GTT_PAGE_SIZE);
+	     pot > ilog2(2 * min_alignment);
 	     pot--) {
 		u64 step = BIT_ULL(pot);
 		u64 addr;
 
-		for (addr = round_up(hole_start + I915_GTT_PAGE_SIZE, step) - I915_GTT_PAGE_SIZE;
-		     addr <= round_down(hole_end - 2*I915_GTT_PAGE_SIZE, step) - I915_GTT_PAGE_SIZE;
+		for (addr = round_up(hole_start + min_alignment, step) - min_alignment;
+		     addr <= round_down(hole_end - (2 * min_alignment), step) - min_alignment;
 		     addr += step) {
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
@@ -760,6 +783,7 @@ static int drunk_hole(struct i915_address_space *vm,
 		      unsigned long end_time)
 {
 	I915_RND_STATE(prng);
+	unsigned int min_alignment;
 	unsigned int size;
 	unsigned long flags;
 
@@ -767,15 +791,18 @@ static int drunk_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	/* Keep creating larger objects until one cannot fit into the hole */
 	for (size = 12; (hole_end - hole_start) >> size; size++) {
 		struct drm_i915_gem_object *obj;
 		unsigned int *order, count, n;
 		struct i915_vma *vma;
-		u64 hole_size;
+		u64 hole_size, aligned_size;
 		int err = -ENODEV;
 
-		hole_size = (hole_end - hole_start) >> size;
+		aligned_size = max_t(u32, ilog2(min_alignment), size);
+		hole_size = (hole_end - hole_start) >> aligned_size;
 		if (hole_size > KMALLOC_MAX_SIZE / sizeof(u32))
 			hole_size = KMALLOC_MAX_SIZE / sizeof(u32);
 		count = hole_size >> 1;
@@ -815,7 +842,7 @@ static int drunk_hole(struct i915_address_space *vm,
 		GEM_BUG_ON(vma->size != BIT_ULL(size));
 
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
@@ -867,11 +894,14 @@ static int __shrink_hole(struct i915_address_space *vm,
 {
 	struct drm_i915_gem_object *obj;
 	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
+	unsigned int min_alignment;
 	unsigned int order = 12;
 	LIST_HEAD(objects);
 	int err = 0;
 	u64 addr;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	/* Keep creating larger objects until one cannot fit into the hole */
 	for (addr = hole_start; addr < hole_end; ) {
 		struct i915_vma *vma;
@@ -912,7 +942,7 @@ static int __shrink_hole(struct i915_address_space *vm,
 		}
 
 		i915_vma_unpin(vma);
-		addr += size;
+		addr += round_up(size, min_alignment);
 
 		/*
 		 * Since we are injecting allocation faults at random intervals,
-- 
2.25.1

[Intel-gfx] [PATCH 1/4] drm/i915: enforce min GTT alignment for discrete cards

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

For local-memory objects we need to align the GTT addresses
to 64K, both for the ppgtt and ggtt.

We need to support vm->min_alignment > 4K, depending
on the vm itself and the type of object we are inserting.
With this in mind update the GTT selftests to take this
into account.

For DG2 we further align and pad lmem object GTT addresses
to 2MB to ensure PDEs contain consistent page sizes as
required by the HW.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 .../i915/gem/selftests/i915_gem_client_blt.c  | 23 +++--
 drivers/gpu/drm/i915/gt/intel_gtt.c           | 14 +++
 drivers/gpu/drm/i915/gt/intel_gtt.h           |  9 ++
 drivers/gpu/drm/i915/i915_vma.c               | 14 +++
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 96 ++++++++++++-------
 5 files changed, 115 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
index c08f766e6e15..7fee95a65414 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
@@ -39,6 +39,7 @@ struct tiled_blits {
 	struct blit_buffer scratch;
 	struct i915_vma *batch;
 	u64 hole;
+	u64 align;
 	u32 width;
 	u32 height;
 };
@@ -410,14 +411,21 @@ tiled_blits_create(struct intel_engine_cs *engine, struct rnd_state *prng)
 		goto err_free;
 	}
 
-	hole_size = 2 * PAGE_ALIGN(WIDTH * HEIGHT * 4);
+	t->align = I915_GTT_PAGE_SIZE_2M; /* XXX worst case, derive from vm! */
+	t->align = max(t->align,
+		       i915_vm_min_alignment(t->ce->vm, INTEL_MEMORY_LOCAL));
+	t->align = max(t->align,
+		       i915_vm_min_alignment(t->ce->vm, INTEL_MEMORY_SYSTEM));
+
+	hole_size = 2 * round_up(WIDTH * HEIGHT * 4, t->align);
 	hole_size *= 2; /* room to maneuver */
-	hole_size += 2 * I915_GTT_MIN_ALIGNMENT;
+	hole_size += 2 * t->align; /* padding on either side */
 
 	mutex_lock(&t->ce->vm->mutex);
 	memset(&hole, 0, sizeof(hole));
 	err = drm_mm_insert_node_in_range(&t->ce->vm->mm, &hole,
-					  hole_size, 0, I915_COLOR_UNEVICTABLE,
+					  hole_size, t->align,
+					  I915_COLOR_UNEVICTABLE,
 					  0, U64_MAX,
 					  DRM_MM_INSERT_BEST);
 	if (!err)
@@ -428,7 +436,7 @@ tiled_blits_create(struct intel_engine_cs *engine, struct rnd_state *prng)
 		goto err_put;
 	}
 
-	t->hole = hole.start + I915_GTT_MIN_ALIGNMENT;
+	t->hole = hole.start + t->align;
 	pr_info("Using hole at %llx\n", t->hole);
 
 	err = tiled_blits_create_buffers(t, WIDTH, HEIGHT, prng);
@@ -455,7 +463,7 @@ static void tiled_blits_destroy(struct tiled_blits *t)
 static int tiled_blits_prepare(struct tiled_blits *t,
 			       struct rnd_state *prng)
 {
-	u64 offset = PAGE_ALIGN(t->width * t->height * 4);
+	u64 offset = round_up(t->width * t->height * 4, t->align);
 	u32 *map;
 	int err;
 	int i;
@@ -486,8 +494,7 @@ static int tiled_blits_prepare(struct tiled_blits *t,
 
 static int tiled_blits_bounce(struct tiled_blits *t, struct rnd_state *prng)
 {
-	u64 offset =
-		round_up(t->width * t->height * 4, 2 * I915_GTT_MIN_ALIGNMENT);
+	u64 offset = round_up(t->width * t->height * 4, 2 * t->align);
 	int err;
 
 	/* We want to check position invariant tiling across GTT eviction */
@@ -500,7 +507,7 @@ static int tiled_blits_bounce(struct tiled_blits *t, struct rnd_state *prng)
 
 	/* Reposition so that we overlap the old addresses, and slightly off */
 	err = tiled_blit(t,
-			 &t->buffers[2], t->hole + I915_GTT_MIN_ALIGNMENT,
+			 &t->buffers[2], t->hole + t->align,
 			 &t->buffers[1], t->hole + 3 * offset / 2);
 	if (err)
 		return err;
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index a94be0306464..156852dcf33a 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -219,6 +219,20 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
 
 	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)) {
+		if (IS_DG2(vm->i915)) {
+			vm->min_alignment[INTEL_MEMORY_LOCAL] = I915_GTT_PAGE_SIZE_2M;
+			vm->min_alignment[INTEL_MEMORY_STOLEN_LOCAL] = I915_GTT_PAGE_SIZE_2M;
+		} else {
+			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);
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index 177b42b935a1..b24a496c854e 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -28,6 +28,8 @@
 #include "gt/intel_reset.h"
 #include "i915_selftest.h"
 #include "i915_vma_types.h"
+#include "i915_params.h"
+#include "intel_memory_region.h"
 
 #define I915_GFP_ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
 
@@ -221,6 +223,7 @@ struct i915_address_space {
 	struct device *dma;
 	u64 total;		/* size addr space maps (ex. 2GB for ggtt) */
 	u64 reserved;		/* size addr space reserved */
+	u64 min_alignment[INTEL_MEMORY_STOLEN_LOCAL + 1];
 
 	unsigned int bind_async_flags;
 
@@ -379,6 +382,12 @@ i915_vm_has_scratch_64K(struct i915_address_space *vm)
 	return vm->scratch_order == get_order(I915_GTT_PAGE_SIZE_64K);
 }
 
+static inline u64 i915_vm_min_alignment(struct i915_address_space *vm,
+					enum intel_memory_type type)
+{
+	return vm->min_alignment[type];
+}
+
 static inline bool
 i915_vm_has_cache_coloring(struct i915_address_space *vm)
 {
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index be208a8f1ed0..f354e465a6cd 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -694,6 +694,20 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 	}
 
 	color = 0;
+
+	if (HAS_64K_PAGES(vma->vm->i915) && i915_gem_object_is_lmem(vma->obj)) {
+		alignment = max(alignment, I915_GTT_PAGE_SIZE_64K);
+		/*
+		 * DG2 can not have different sized pages in any given PDE (2MB range).
+		 * Keeping things simple, we force any lmem object to reserve
+		 * 2MB chunks, preventing any smaller pages being used alongside
+		 */
+		if (IS_DG2(vma->vm->i915)) {
+			alignment = max(alignment, I915_GTT_PAGE_SIZE_2M);
+			size = round_up(size, I915_GTT_PAGE_SIZE_2M);
+		}
+	}
+
 	if (i915_vm_has_cache_coloring(vma->vm))
 		color = vma->obj->cache_level;
 
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 357ced0b88e7..fea031b4ec4f 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -237,6 +237,8 @@ static int lowlevel_hole(struct i915_address_space *vm,
 			 u64 hole_start, u64 hole_end,
 			 unsigned long end_time)
 {
+	const unsigned int min_alignment =
+		i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
 	I915_RND_STATE(seed_prng);
 	struct i915_vma *mock_vma;
 	unsigned int size;
@@ -250,9 +252,10 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		I915_RND_SUBSTATE(prng, seed_prng);
 		struct drm_i915_gem_object *obj;
 		unsigned int *order, count, n;
-		u64 hole_size;
+		u64 hole_size, aligned_size;
 
-		hole_size = (hole_end - hole_start) >> size;
+		aligned_size = max_t(u32, ilog2(min_alignment), size);
+		hole_size = (hole_end - hole_start) >> aligned_size;
 		if (hole_size > KMALLOC_MAX_SIZE / sizeof(u32))
 			hole_size = KMALLOC_MAX_SIZE / sizeof(u32);
 		count = hole_size >> 1;
@@ -273,8 +276,8 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		}
 		GEM_BUG_ON(!order);
 
-		GEM_BUG_ON(count * BIT_ULL(size) > vm->total);
-		GEM_BUG_ON(hole_start + count * BIT_ULL(size) > hole_end);
+		GEM_BUG_ON(count * BIT_ULL(aligned_size) > vm->total);
+		GEM_BUG_ON(hole_start + count * BIT_ULL(aligned_size) > hole_end);
 
 		/* Ignore allocation failures (i.e. don't report them as
 		 * a test failure) as we are purposefully allocating very
@@ -297,10 +300,10 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		}
 
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 			intel_wakeref_t wakeref;
 
-			GEM_BUG_ON(addr + BIT_ULL(size) > vm->total);
+			GEM_BUG_ON(addr + BIT_ULL(aligned_size) > vm->total);
 
 			if (igt_timeout(end_time,
 					"%s timed out before %d/%d\n",
@@ -343,7 +346,7 @@ static int lowlevel_hole(struct i915_address_space *vm,
 			}
 
 			mock_vma->pages = obj->mm.pages;
-			mock_vma->node.size = BIT_ULL(size);
+			mock_vma->node.size = BIT_ULL(aligned_size);
 			mock_vma->node.start = addr;
 
 			with_intel_runtime_pm(vm->gt->uncore->rpm, wakeref)
@@ -354,7 +357,7 @@ static int lowlevel_hole(struct i915_address_space *vm,
 
 		i915_random_reorder(order, count, &prng);
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 			intel_wakeref_t wakeref;
 
 			GEM_BUG_ON(addr + BIT_ULL(size) > vm->total);
@@ -398,8 +401,10 @@ static int fill_hole(struct i915_address_space *vm,
 {
 	const u64 hole_size = hole_end - hole_start;
 	struct drm_i915_gem_object *obj;
+	const unsigned int min_alignment =
+		i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
 	const unsigned long max_pages =
-		min_t(u64, ULONG_MAX - 1, hole_size/2 >> PAGE_SHIFT);
+		min_t(u64, ULONG_MAX - 1, (hole_size / 2) >> ilog2(min_alignment));
 	const unsigned long max_step = max(int_sqrt(max_pages), 2UL);
 	unsigned long npages, prime, flags;
 	struct i915_vma *vma;
@@ -440,14 +445,17 @@ static int fill_hole(struct i915_address_space *vm,
 
 				offset = p->offset;
 				list_for_each_entry(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					err = i915_vma_pin(vma, 0, 0, offset | flags);
@@ -469,22 +477,25 @@ static int fill_hole(struct i915_address_space *vm,
 					i915_vma_unpin(vma);
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					if (!drm_mm_node_allocated(&vma->node) ||
@@ -505,22 +516,25 @@ static int fill_hole(struct i915_address_space *vm,
 					}
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry_reverse(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					err = i915_vma_pin(vma, 0, 0, offset | flags);
@@ -542,22 +556,25 @@ static int fill_hole(struct i915_address_space *vm,
 					i915_vma_unpin(vma);
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry_reverse(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					if (!drm_mm_node_allocated(&vma->node) ||
@@ -578,9 +595,9 @@ static int fill_hole(struct i915_address_space *vm,
 					}
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 			}
@@ -610,6 +627,7 @@ static int walk_hole(struct i915_address_space *vm,
 	const u64 hole_size = hole_end - hole_start;
 	const unsigned long max_pages =
 		min_t(u64, ULONG_MAX - 1, hole_size >> PAGE_SHIFT);
+	unsigned long min_alignment;
 	unsigned long flags;
 	u64 size;
 
@@ -619,6 +637,8 @@ static int walk_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	for_each_prime_number_from(size, 1, max_pages) {
 		struct drm_i915_gem_object *obj;
 		struct i915_vma *vma;
@@ -637,7 +657,7 @@ static int walk_hole(struct i915_address_space *vm,
 
 		for (addr = hole_start;
 		     addr + obj->base.size < hole_end;
-		     addr += obj->base.size) {
+		     addr += round_up(obj->base.size, min_alignment)) {
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
 				pr_err("%s bind failed at %llx + %llx [hole %llx- %llx] with err=%d\n",
@@ -689,6 +709,7 @@ static int pot_hole(struct i915_address_space *vm,
 {
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
+	unsigned int min_alignment;
 	unsigned long flags;
 	unsigned int pot;
 	int err = 0;
@@ -697,6 +718,8 @@ static int pot_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	obj = i915_gem_object_create_internal(vm->i915, 2 * I915_GTT_PAGE_SIZE);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);
@@ -709,13 +732,13 @@ static int pot_hole(struct i915_address_space *vm,
 
 	/* Insert a pair of pages across every pot boundary within the hole */
 	for (pot = fls64(hole_end - 1) - 1;
-	     pot > ilog2(2 * I915_GTT_PAGE_SIZE);
+	     pot > ilog2(2 * min_alignment);
 	     pot--) {
 		u64 step = BIT_ULL(pot);
 		u64 addr;
 
-		for (addr = round_up(hole_start + I915_GTT_PAGE_SIZE, step) - I915_GTT_PAGE_SIZE;
-		     addr <= round_down(hole_end - 2*I915_GTT_PAGE_SIZE, step) - I915_GTT_PAGE_SIZE;
+		for (addr = round_up(hole_start + min_alignment, step) - min_alignment;
+		     addr <= round_down(hole_end - (2 * min_alignment), step) - min_alignment;
 		     addr += step) {
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
@@ -760,6 +783,7 @@ static int drunk_hole(struct i915_address_space *vm,
 		      unsigned long end_time)
 {
 	I915_RND_STATE(prng);
+	unsigned int min_alignment;
 	unsigned int size;
 	unsigned long flags;
 
@@ -767,15 +791,18 @@ static int drunk_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	/* Keep creating larger objects until one cannot fit into the hole */
 	for (size = 12; (hole_end - hole_start) >> size; size++) {
 		struct drm_i915_gem_object *obj;
 		unsigned int *order, count, n;
 		struct i915_vma *vma;
-		u64 hole_size;
+		u64 hole_size, aligned_size;
 		int err = -ENODEV;
 
-		hole_size = (hole_end - hole_start) >> size;
+		aligned_size = max_t(u32, ilog2(min_alignment), size);
+		hole_size = (hole_end - hole_start) >> aligned_size;
 		if (hole_size > KMALLOC_MAX_SIZE / sizeof(u32))
 			hole_size = KMALLOC_MAX_SIZE / sizeof(u32);
 		count = hole_size >> 1;
@@ -815,7 +842,7 @@ static int drunk_hole(struct i915_address_space *vm,
 		GEM_BUG_ON(vma->size != BIT_ULL(size));
 
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
@@ -867,11 +894,14 @@ static int __shrink_hole(struct i915_address_space *vm,
 {
 	struct drm_i915_gem_object *obj;
 	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
+	unsigned int min_alignment;
 	unsigned int order = 12;
 	LIST_HEAD(objects);
 	int err = 0;
 	u64 addr;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	/* Keep creating larger objects until one cannot fit into the hole */
 	for (addr = hole_start; addr < hole_end; ) {
 		struct i915_vma *vma;
@@ -912,7 +942,7 @@ static int __shrink_hole(struct i915_address_space *vm,
 		}
 
 		i915_vma_unpin(vma);
-		addr += size;
+		addr += round_up(size, min_alignment);
 
 		/*
 		 * Since we are injecting allocation faults at random intervals,
-- 
2.25.1

[PATCH 1/4] drm/i915: enforce min GTT alignment for discrete cards

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

For local-memory objects we need to align the GTT addresses
to 64K, both for the ppgtt and ggtt.

We need to support vm->min_alignment > 4K, depending
on the vm itself and the type of object we are inserting.
With this in mind update the GTT selftests to take this
into account.

For DG2 we further align and pad lmem object GTT addresses
to 2MB to ensure PDEs contain consistent page sizes as
required by the HW.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 .../i915/gem/selftests/i915_gem_client_blt.c  | 23 +++--
 drivers/gpu/drm/i915/gt/intel_gtt.c           | 14 +++
 drivers/gpu/drm/i915/gt/intel_gtt.h           |  9 ++
 drivers/gpu/drm/i915/i915_vma.c               | 14 +++
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 96 ++++++++++++-------
 5 files changed, 115 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
index c08f766e6e15..7fee95a65414 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
@@ -39,6 +39,7 @@ struct tiled_blits {
 	struct blit_buffer scratch;
 	struct i915_vma *batch;
 	u64 hole;
+	u64 align;
 	u32 width;
 	u32 height;
 };
@@ -410,14 +411,21 @@ tiled_blits_create(struct intel_engine_cs *engine, struct rnd_state *prng)
 		goto err_free;
 	}
 
-	hole_size = 2 * PAGE_ALIGN(WIDTH * HEIGHT * 4);
+	t->align = I915_GTT_PAGE_SIZE_2M; /* XXX worst case, derive from vm! */
+	t->align = max(t->align,
+		       i915_vm_min_alignment(t->ce->vm, INTEL_MEMORY_LOCAL));
+	t->align = max(t->align,
+		       i915_vm_min_alignment(t->ce->vm, INTEL_MEMORY_SYSTEM));
+
+	hole_size = 2 * round_up(WIDTH * HEIGHT * 4, t->align);
 	hole_size *= 2; /* room to maneuver */
-	hole_size += 2 * I915_GTT_MIN_ALIGNMENT;
+	hole_size += 2 * t->align; /* padding on either side */
 
 	mutex_lock(&t->ce->vm->mutex);
 	memset(&hole, 0, sizeof(hole));
 	err = drm_mm_insert_node_in_range(&t->ce->vm->mm, &hole,
-					  hole_size, 0, I915_COLOR_UNEVICTABLE,
+					  hole_size, t->align,
+					  I915_COLOR_UNEVICTABLE,
 					  0, U64_MAX,
 					  DRM_MM_INSERT_BEST);
 	if (!err)
@@ -428,7 +436,7 @@ tiled_blits_create(struct intel_engine_cs *engine, struct rnd_state *prng)
 		goto err_put;
 	}
 
-	t->hole = hole.start + I915_GTT_MIN_ALIGNMENT;
+	t->hole = hole.start + t->align;
 	pr_info("Using hole at %llx\n", t->hole);
 
 	err = tiled_blits_create_buffers(t, WIDTH, HEIGHT, prng);
@@ -455,7 +463,7 @@ static void tiled_blits_destroy(struct tiled_blits *t)
 static int tiled_blits_prepare(struct tiled_blits *t,
 			       struct rnd_state *prng)
 {
-	u64 offset = PAGE_ALIGN(t->width * t->height * 4);
+	u64 offset = round_up(t->width * t->height * 4, t->align);
 	u32 *map;
 	int err;
 	int i;
@@ -486,8 +494,7 @@ static int tiled_blits_prepare(struct tiled_blits *t,
 
 static int tiled_blits_bounce(struct tiled_blits *t, struct rnd_state *prng)
 {
-	u64 offset =
-		round_up(t->width * t->height * 4, 2 * I915_GTT_MIN_ALIGNMENT);
+	u64 offset = round_up(t->width * t->height * 4, 2 * t->align);
 	int err;
 
 	/* We want to check position invariant tiling across GTT eviction */
@@ -500,7 +507,7 @@ static int tiled_blits_bounce(struct tiled_blits *t, struct rnd_state *prng)
 
 	/* Reposition so that we overlap the old addresses, and slightly off */
 	err = tiled_blit(t,
-			 &t->buffers[2], t->hole + I915_GTT_MIN_ALIGNMENT,
+			 &t->buffers[2], t->hole + t->align,
 			 &t->buffers[1], t->hole + 3 * offset / 2);
 	if (err)
 		return err;
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index a94be0306464..156852dcf33a 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -219,6 +219,20 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
 
 	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)) {
+		if (IS_DG2(vm->i915)) {
+			vm->min_alignment[INTEL_MEMORY_LOCAL] = I915_GTT_PAGE_SIZE_2M;
+			vm->min_alignment[INTEL_MEMORY_STOLEN_LOCAL] = I915_GTT_PAGE_SIZE_2M;
+		} else {
+			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);
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index 177b42b935a1..b24a496c854e 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -28,6 +28,8 @@
 #include "gt/intel_reset.h"
 #include "i915_selftest.h"
 #include "i915_vma_types.h"
+#include "i915_params.h"
+#include "intel_memory_region.h"
 
 #define I915_GFP_ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
 
@@ -221,6 +223,7 @@ struct i915_address_space {
 	struct device *dma;
 	u64 total;		/* size addr space maps (ex. 2GB for ggtt) */
 	u64 reserved;		/* size addr space reserved */
+	u64 min_alignment[INTEL_MEMORY_STOLEN_LOCAL + 1];
 
 	unsigned int bind_async_flags;
 
@@ -379,6 +382,12 @@ i915_vm_has_scratch_64K(struct i915_address_space *vm)
 	return vm->scratch_order == get_order(I915_GTT_PAGE_SIZE_64K);
 }
 
+static inline u64 i915_vm_min_alignment(struct i915_address_space *vm,
+					enum intel_memory_type type)
+{
+	return vm->min_alignment[type];
+}
+
 static inline bool
 i915_vm_has_cache_coloring(struct i915_address_space *vm)
 {
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index be208a8f1ed0..f354e465a6cd 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -694,6 +694,20 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 	}
 
 	color = 0;
+
+	if (HAS_64K_PAGES(vma->vm->i915) && i915_gem_object_is_lmem(vma->obj)) {
+		alignment = max(alignment, I915_GTT_PAGE_SIZE_64K);
+		/*
+		 * DG2 can not have different sized pages in any given PDE (2MB range).
+		 * Keeping things simple, we force any lmem object to reserve
+		 * 2MB chunks, preventing any smaller pages being used alongside
+		 */
+		if (IS_DG2(vma->vm->i915)) {
+			alignment = max(alignment, I915_GTT_PAGE_SIZE_2M);
+			size = round_up(size, I915_GTT_PAGE_SIZE_2M);
+		}
+	}
+
 	if (i915_vm_has_cache_coloring(vma->vm))
 		color = vma->obj->cache_level;
 
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 357ced0b88e7..fea031b4ec4f 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -237,6 +237,8 @@ static int lowlevel_hole(struct i915_address_space *vm,
 			 u64 hole_start, u64 hole_end,
 			 unsigned long end_time)
 {
+	const unsigned int min_alignment =
+		i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
 	I915_RND_STATE(seed_prng);
 	struct i915_vma *mock_vma;
 	unsigned int size;
@@ -250,9 +252,10 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		I915_RND_SUBSTATE(prng, seed_prng);
 		struct drm_i915_gem_object *obj;
 		unsigned int *order, count, n;
-		u64 hole_size;
+		u64 hole_size, aligned_size;
 
-		hole_size = (hole_end - hole_start) >> size;
+		aligned_size = max_t(u32, ilog2(min_alignment), size);
+		hole_size = (hole_end - hole_start) >> aligned_size;
 		if (hole_size > KMALLOC_MAX_SIZE / sizeof(u32))
 			hole_size = KMALLOC_MAX_SIZE / sizeof(u32);
 		count = hole_size >> 1;
@@ -273,8 +276,8 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		}
 		GEM_BUG_ON(!order);
 
-		GEM_BUG_ON(count * BIT_ULL(size) > vm->total);
-		GEM_BUG_ON(hole_start + count * BIT_ULL(size) > hole_end);
+		GEM_BUG_ON(count * BIT_ULL(aligned_size) > vm->total);
+		GEM_BUG_ON(hole_start + count * BIT_ULL(aligned_size) > hole_end);
 
 		/* Ignore allocation failures (i.e. don't report them as
 		 * a test failure) as we are purposefully allocating very
@@ -297,10 +300,10 @@ static int lowlevel_hole(struct i915_address_space *vm,
 		}
 
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 			intel_wakeref_t wakeref;
 
-			GEM_BUG_ON(addr + BIT_ULL(size) > vm->total);
+			GEM_BUG_ON(addr + BIT_ULL(aligned_size) > vm->total);
 
 			if (igt_timeout(end_time,
 					"%s timed out before %d/%d\n",
@@ -343,7 +346,7 @@ static int lowlevel_hole(struct i915_address_space *vm,
 			}
 
 			mock_vma->pages = obj->mm.pages;
-			mock_vma->node.size = BIT_ULL(size);
+			mock_vma->node.size = BIT_ULL(aligned_size);
 			mock_vma->node.start = addr;
 
 			with_intel_runtime_pm(vm->gt->uncore->rpm, wakeref)
@@ -354,7 +357,7 @@ static int lowlevel_hole(struct i915_address_space *vm,
 
 		i915_random_reorder(order, count, &prng);
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 			intel_wakeref_t wakeref;
 
 			GEM_BUG_ON(addr + BIT_ULL(size) > vm->total);
@@ -398,8 +401,10 @@ static int fill_hole(struct i915_address_space *vm,
 {
 	const u64 hole_size = hole_end - hole_start;
 	struct drm_i915_gem_object *obj;
+	const unsigned int min_alignment =
+		i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
 	const unsigned long max_pages =
-		min_t(u64, ULONG_MAX - 1, hole_size/2 >> PAGE_SHIFT);
+		min_t(u64, ULONG_MAX - 1, (hole_size / 2) >> ilog2(min_alignment));
 	const unsigned long max_step = max(int_sqrt(max_pages), 2UL);
 	unsigned long npages, prime, flags;
 	struct i915_vma *vma;
@@ -440,14 +445,17 @@ static int fill_hole(struct i915_address_space *vm,
 
 				offset = p->offset;
 				list_for_each_entry(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					err = i915_vma_pin(vma, 0, 0, offset | flags);
@@ -469,22 +477,25 @@ static int fill_hole(struct i915_address_space *vm,
 					i915_vma_unpin(vma);
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					if (!drm_mm_node_allocated(&vma->node) ||
@@ -505,22 +516,25 @@ static int fill_hole(struct i915_address_space *vm,
 					}
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry_reverse(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					err = i915_vma_pin(vma, 0, 0, offset | flags);
@@ -542,22 +556,25 @@ static int fill_hole(struct i915_address_space *vm,
 					i915_vma_unpin(vma);
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 
 				offset = p->offset;
 				list_for_each_entry_reverse(obj, &objects, st_link) {
+					u64 aligned_size = round_up(obj->base.size,
+								    min_alignment);
+
 					vma = i915_vma_instance(obj, vm, NULL);
 					if (IS_ERR(vma))
 						continue;
 
 					if (p->step < 0) {
-						if (offset < hole_start + obj->base.size)
+						if (offset < hole_start + aligned_size)
 							break;
-						offset -= obj->base.size;
+						offset -= aligned_size;
 					}
 
 					if (!drm_mm_node_allocated(&vma->node) ||
@@ -578,9 +595,9 @@ static int fill_hole(struct i915_address_space *vm,
 					}
 
 					if (p->step > 0) {
-						if (offset + obj->base.size > hole_end)
+						if (offset + aligned_size > hole_end)
 							break;
-						offset += obj->base.size;
+						offset += aligned_size;
 					}
 				}
 			}
@@ -610,6 +627,7 @@ static int walk_hole(struct i915_address_space *vm,
 	const u64 hole_size = hole_end - hole_start;
 	const unsigned long max_pages =
 		min_t(u64, ULONG_MAX - 1, hole_size >> PAGE_SHIFT);
+	unsigned long min_alignment;
 	unsigned long flags;
 	u64 size;
 
@@ -619,6 +637,8 @@ static int walk_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	for_each_prime_number_from(size, 1, max_pages) {
 		struct drm_i915_gem_object *obj;
 		struct i915_vma *vma;
@@ -637,7 +657,7 @@ static int walk_hole(struct i915_address_space *vm,
 
 		for (addr = hole_start;
 		     addr + obj->base.size < hole_end;
-		     addr += obj->base.size) {
+		     addr += round_up(obj->base.size, min_alignment)) {
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
 				pr_err("%s bind failed at %llx + %llx [hole %llx- %llx] with err=%d\n",
@@ -689,6 +709,7 @@ static int pot_hole(struct i915_address_space *vm,
 {
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
+	unsigned int min_alignment;
 	unsigned long flags;
 	unsigned int pot;
 	int err = 0;
@@ -697,6 +718,8 @@ static int pot_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	obj = i915_gem_object_create_internal(vm->i915, 2 * I915_GTT_PAGE_SIZE);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);
@@ -709,13 +732,13 @@ static int pot_hole(struct i915_address_space *vm,
 
 	/* Insert a pair of pages across every pot boundary within the hole */
 	for (pot = fls64(hole_end - 1) - 1;
-	     pot > ilog2(2 * I915_GTT_PAGE_SIZE);
+	     pot > ilog2(2 * min_alignment);
 	     pot--) {
 		u64 step = BIT_ULL(pot);
 		u64 addr;
 
-		for (addr = round_up(hole_start + I915_GTT_PAGE_SIZE, step) - I915_GTT_PAGE_SIZE;
-		     addr <= round_down(hole_end - 2*I915_GTT_PAGE_SIZE, step) - I915_GTT_PAGE_SIZE;
+		for (addr = round_up(hole_start + min_alignment, step) - min_alignment;
+		     addr <= round_down(hole_end - (2 * min_alignment), step) - min_alignment;
 		     addr += step) {
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
@@ -760,6 +783,7 @@ static int drunk_hole(struct i915_address_space *vm,
 		      unsigned long end_time)
 {
 	I915_RND_STATE(prng);
+	unsigned int min_alignment;
 	unsigned int size;
 	unsigned long flags;
 
@@ -767,15 +791,18 @@ static int drunk_hole(struct i915_address_space *vm,
 	if (i915_is_ggtt(vm))
 		flags |= PIN_GLOBAL;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	/* Keep creating larger objects until one cannot fit into the hole */
 	for (size = 12; (hole_end - hole_start) >> size; size++) {
 		struct drm_i915_gem_object *obj;
 		unsigned int *order, count, n;
 		struct i915_vma *vma;
-		u64 hole_size;
+		u64 hole_size, aligned_size;
 		int err = -ENODEV;
 
-		hole_size = (hole_end - hole_start) >> size;
+		aligned_size = max_t(u32, ilog2(min_alignment), size);
+		hole_size = (hole_end - hole_start) >> aligned_size;
 		if (hole_size > KMALLOC_MAX_SIZE / sizeof(u32))
 			hole_size = KMALLOC_MAX_SIZE / sizeof(u32);
 		count = hole_size >> 1;
@@ -815,7 +842,7 @@ static int drunk_hole(struct i915_address_space *vm,
 		GEM_BUG_ON(vma->size != BIT_ULL(size));
 
 		for (n = 0; n < count; n++) {
-			u64 addr = hole_start + order[n] * BIT_ULL(size);
+			u64 addr = hole_start + order[n] * BIT_ULL(aligned_size);
 
 			err = i915_vma_pin(vma, 0, 0, addr | flags);
 			if (err) {
@@ -867,11 +894,14 @@ static int __shrink_hole(struct i915_address_space *vm,
 {
 	struct drm_i915_gem_object *obj;
 	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
+	unsigned int min_alignment;
 	unsigned int order = 12;
 	LIST_HEAD(objects);
 	int err = 0;
 	u64 addr;
 
+	min_alignment = i915_vm_min_alignment(vm, INTEL_MEMORY_SYSTEM);
+
 	/* Keep creating larger objects until one cannot fit into the hole */
 	for (addr = hole_start; addr < hole_end; ) {
 		struct i915_vma *vma;
@@ -912,7 +942,7 @@ static int __shrink_hole(struct i915_address_space *vm,
 		}
 
 		i915_vma_unpin(vma);
-		addr += size;
+		addr += round_up(size, min_alignment);
 
 		/*
 		 * Since we are injecting allocation faults at random intervals,
-- 
2.25.1

[PATCH 2/4] drm/i915: support 64K GTT pages for discrete cards

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

discrete cards optimise 64K GTT pages for local-memory, since everything
should be allocated at 64K granularity. We say goodbye to sparse
entries, and instead get a compact 256B page-table for 64K pages,
which should be more cache friendly. 4K pages for local-memory
are no longer supported by the HW.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 .../gpu/drm/i915/gem/selftests/huge_pages.c   |  60 ++++++++++
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c          | 109 +++++++++++++++++-
 drivers/gpu/drm/i915/gt/intel_gtt.h           |   3 +
 drivers/gpu/drm/i915/gt/intel_ppgtt.c         |   1 +
 4 files changed, 170 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index 11f0aa65f8a3..ef3439b290ca 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -1483,6 +1483,65 @@ static int igt_ppgtt_sanity_check(void *arg)
 	return err;
 }
 
+static int igt_ppgtt_compact(void *arg)
+{
+	struct drm_i915_private *i915 = arg;
+	struct drm_i915_gem_object *obj;
+	int err;
+
+	/*
+	 * Simple test to catch issues with compact 64K pages -- since the pt is
+	 * compacted to 256B that gives us 32 entries per pt, however since the
+	 * backing page for the pt is 4K, any extra entries we might incorrectly
+	 * write out should be ignored by the HW. If ever hit such a case this
+	 * test should catch it since some of our writes would land in scratch.
+	 */
+
+	if (!HAS_64K_PAGES(i915)) {
+		pr_info("device lacks compact 64K page support, skipping\n");
+		return 0;
+	}
+
+	if (!HAS_LMEM(i915)) {
+		pr_info("device lacks LMEM support, skipping\n");
+		return 0;
+	}
+
+	/* We want the range to cover multiple page-table boundaries. */
+	obj = i915_gem_object_create_lmem(i915, SZ_4M, 0);
+	if (IS_ERR(obj))
+		return err;
+
+	err = i915_gem_object_pin_pages_unlocked(obj);
+	if (err)
+		goto out_put;
+
+	if (obj->mm.page_sizes.phys < I915_GTT_PAGE_SIZE_64K) {
+		pr_info("LMEM compact unable to allocate huge-page(s)\n");
+		goto out_unpin;
+	}
+
+	/*
+	 * Disable 2M GTT pages by forcing the page-size to 64K for the GTT
+	 * insertion.
+	 */
+	obj->mm.page_sizes.sg = I915_GTT_PAGE_SIZE_64K;
+
+	err = igt_write_huge(i915, obj);
+	if (err)
+		pr_err("LMEM compact write-huge failed\n");
+
+out_unpin:
+	i915_gem_object_unpin_pages(obj);
+out_put:
+	i915_gem_object_put(obj);
+
+	if (err == -ENOMEM)
+		err = 0;
+
+	return err;
+}
+
 static int igt_tmpfs_fallback(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
@@ -1740,6 +1799,7 @@ int i915_gem_huge_page_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(igt_tmpfs_fallback),
 		SUBTEST(igt_ppgtt_smoke_huge),
 		SUBTEST(igt_ppgtt_sanity_check),
+		SUBTEST(igt_ppgtt_compact),
 	};
 
 	if (!HAS_PPGTT(i915)) {
diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index b012c50f7ce7..8d081497e87e 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -233,6 +233,8 @@ static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
 						   start, end, lvl);
 		} else {
 			unsigned int count;
+			unsigned int pte = gen8_pd_index(start, 0);
+			unsigned int num_ptes;
 			u64 *vaddr;
 
 			count = gen8_pt_count(start, end);
@@ -242,10 +244,18 @@ static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
 			    atomic_read(&pt->used));
 			GEM_BUG_ON(!count || count >= atomic_read(&pt->used));
 
+			num_ptes = count;
+			if (pt->is_compact) {
+				GEM_BUG_ON(num_ptes % 16);
+				GEM_BUG_ON(pte % 16);
+				num_ptes /= 16;
+				pte /= 16;
+			}
+
 			vaddr = px_vaddr(pt);
-			memset64(vaddr + gen8_pd_index(start, 0),
+			memset64(vaddr + pte,
 				 vm->scratch[0]->encode,
-				 count);
+				 num_ptes);
 
 			atomic_sub(count, &pt->used);
 			start += count;
@@ -453,6 +463,96 @@ gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
 	return idx;
 }
 
+static void
+xehpsdv_ppgtt_insert_huge(struct i915_vma *vma,
+			  struct sgt_dma *iter,
+			  enum i915_cache_level cache_level,
+			  u32 flags)
+{
+	const gen8_pte_t pte_encode = vma->vm->pte_encode(0, cache_level, flags);
+	unsigned int rem = sg_dma_len(iter->sg);
+	u64 start = vma->node.start;
+
+	GEM_BUG_ON(!i915_vm_is_4lvl(vma->vm));
+
+	do {
+		struct i915_page_directory * const pdp =
+			gen8_pdp_for_page_address(vma->vm, start);
+		struct i915_page_directory * const pd =
+			i915_pd_entry(pdp, __gen8_pte_index(start, 2));
+		struct i915_page_table *pt =
+			i915_pt_entry(pd, __gen8_pte_index(start, 1));
+		gen8_pte_t encode = pte_encode;
+		unsigned int page_size;
+		gen8_pte_t *vaddr;
+		u16 index, max;
+
+		max = I915_PDES;
+
+		if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_2M &&
+		    IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) &&
+		    rem >= I915_GTT_PAGE_SIZE_2M &&
+		    !__gen8_pte_index(start, 0)) {
+			index = __gen8_pte_index(start, 1);
+			encode |= GEN8_PDE_PS_2M;
+			page_size = I915_GTT_PAGE_SIZE_2M;
+
+			vaddr = px_vaddr(pd);
+		} else {
+			if (encode & GEN12_PPGTT_PTE_LM) {
+				GEM_BUG_ON(!i915_gem_object_is_lmem(vma->obj));
+				GEM_BUG_ON(__gen8_pte_index(start, 0) % 16);
+				GEM_BUG_ON(rem < I915_GTT_PAGE_SIZE_64K);
+				GEM_BUG_ON(!IS_ALIGNED(iter->dma,
+						       I915_GTT_PAGE_SIZE_64K));
+
+				index = __gen8_pte_index(start, 0) / 16;
+				page_size = I915_GTT_PAGE_SIZE_64K;
+
+				max /= 16;
+
+				vaddr = px_vaddr(pd);
+				vaddr[__gen8_pte_index(start, 1)] |= GEN12_PDE_64K;
+
+				pt->is_compact = true;
+			} else {
+				GEM_BUG_ON(i915_gem_object_is_lmem(vma->obj));
+				GEM_BUG_ON(pt->is_compact);
+				index =  __gen8_pte_index(start, 0);
+				page_size = I915_GTT_PAGE_SIZE;
+			}
+
+			vaddr = px_vaddr(pt);
+		}
+
+		do {
+			GEM_BUG_ON(rem < page_size);
+			vaddr[index++] = encode | iter->dma;
+
+			start += page_size;
+			iter->dma += page_size;
+			rem -= page_size;
+			if (iter->dma >= iter->max) {
+				iter->sg = __sg_next(iter->sg);
+				if (!iter->sg)
+					break;
+
+				rem = sg_dma_len(iter->sg);
+				if (!rem)
+					break;
+
+				iter->dma = sg_dma_address(iter->sg);
+				iter->max = iter->dma + rem;
+
+				if (unlikely(!IS_ALIGNED(iter->dma, page_size)))
+					break;
+			}
+		} while (rem >= page_size && index < max);
+
+		vma->page_sizes.gtt |= page_size;
+	} while (iter->sg && sg_dma_len(iter->sg));
+}
+
 static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
 				   struct sgt_dma *iter,
 				   enum i915_cache_level cache_level,
@@ -585,7 +685,10 @@ static void gen8_ppgtt_insert(struct i915_address_space *vm,
 	struct sgt_dma iter = sgt_dma(vma);
 
 	if (vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
-		gen8_ppgtt_insert_huge(vma, &iter, cache_level, flags);
+		if (HAS_64K_PAGES(vm->i915))
+			xehpsdv_ppgtt_insert_huge(vma, &iter, cache_level, flags);
+		else
+			gen8_ppgtt_insert_huge(vma, &iter, cache_level, flags);
 	} else  {
 		u64 idx = vma->node.start >> GEN8_PTE_SHIFT;
 
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index b24a496c854e..ef6d5c70f4ff 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -91,6 +91,8 @@ typedef u64 gen8_pte_t;
 
 #define GEN12_GGTT_PTE_LM	BIT_ULL(1)
 
+#define GEN12_PDE_64K BIT(6)
+
 /*
  * Cacheability Control is a 4-bit value. The low three bits are stored in bits
  * 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE.
@@ -159,6 +161,7 @@ struct i915_page_table {
 		atomic_t used;
 		struct i915_page_table *stash;
 	};
+	bool is_compact;
 };
 
 struct i915_page_directory {
diff --git a/drivers/gpu/drm/i915/gt/intel_ppgtt.c b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
index 083b3090c69c..f4cb6544cfac 100644
--- a/drivers/gpu/drm/i915/gt/intel_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
@@ -26,6 +26,7 @@ struct i915_page_table *alloc_pt(struct i915_address_space *vm)
 		return ERR_PTR(-ENOMEM);
 	}
 
+	pt->is_compact = false;
 	atomic_set(&pt->used, 0);
 	return pt;
 }
-- 
2.25.1

[Intel-gfx] [PATCH 2/4] drm/i915: support 64K GTT pages for discrete cards

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

discrete cards optimise 64K GTT pages for local-memory, since everything
should be allocated at 64K granularity. We say goodbye to sparse
entries, and instead get a compact 256B page-table for 64K pages,
which should be more cache friendly. 4K pages for local-memory
are no longer supported by the HW.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 .../gpu/drm/i915/gem/selftests/huge_pages.c   |  60 ++++++++++
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c          | 109 +++++++++++++++++-
 drivers/gpu/drm/i915/gt/intel_gtt.h           |   3 +
 drivers/gpu/drm/i915/gt/intel_ppgtt.c         |   1 +
 4 files changed, 170 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index 11f0aa65f8a3..ef3439b290ca 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -1483,6 +1483,65 @@ static int igt_ppgtt_sanity_check(void *arg)
 	return err;
 }
 
+static int igt_ppgtt_compact(void *arg)
+{
+	struct drm_i915_private *i915 = arg;
+	struct drm_i915_gem_object *obj;
+	int err;
+
+	/*
+	 * Simple test to catch issues with compact 64K pages -- since the pt is
+	 * compacted to 256B that gives us 32 entries per pt, however since the
+	 * backing page for the pt is 4K, any extra entries we might incorrectly
+	 * write out should be ignored by the HW. If ever hit such a case this
+	 * test should catch it since some of our writes would land in scratch.
+	 */
+
+	if (!HAS_64K_PAGES(i915)) {
+		pr_info("device lacks compact 64K page support, skipping\n");
+		return 0;
+	}
+
+	if (!HAS_LMEM(i915)) {
+		pr_info("device lacks LMEM support, skipping\n");
+		return 0;
+	}
+
+	/* We want the range to cover multiple page-table boundaries. */
+	obj = i915_gem_object_create_lmem(i915, SZ_4M, 0);
+	if (IS_ERR(obj))
+		return err;
+
+	err = i915_gem_object_pin_pages_unlocked(obj);
+	if (err)
+		goto out_put;
+
+	if (obj->mm.page_sizes.phys < I915_GTT_PAGE_SIZE_64K) {
+		pr_info("LMEM compact unable to allocate huge-page(s)\n");
+		goto out_unpin;
+	}
+
+	/*
+	 * Disable 2M GTT pages by forcing the page-size to 64K for the GTT
+	 * insertion.
+	 */
+	obj->mm.page_sizes.sg = I915_GTT_PAGE_SIZE_64K;
+
+	err = igt_write_huge(i915, obj);
+	if (err)
+		pr_err("LMEM compact write-huge failed\n");
+
+out_unpin:
+	i915_gem_object_unpin_pages(obj);
+out_put:
+	i915_gem_object_put(obj);
+
+	if (err == -ENOMEM)
+		err = 0;
+
+	return err;
+}
+
 static int igt_tmpfs_fallback(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
@@ -1740,6 +1799,7 @@ int i915_gem_huge_page_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(igt_tmpfs_fallback),
 		SUBTEST(igt_ppgtt_smoke_huge),
 		SUBTEST(igt_ppgtt_sanity_check),
+		SUBTEST(igt_ppgtt_compact),
 	};
 
 	if (!HAS_PPGTT(i915)) {
diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index b012c50f7ce7..8d081497e87e 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -233,6 +233,8 @@ static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
 						   start, end, lvl);
 		} else {
 			unsigned int count;
+			unsigned int pte = gen8_pd_index(start, 0);
+			unsigned int num_ptes;
 			u64 *vaddr;
 
 			count = gen8_pt_count(start, end);
@@ -242,10 +244,18 @@ static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
 			    atomic_read(&pt->used));
 			GEM_BUG_ON(!count || count >= atomic_read(&pt->used));
 
+			num_ptes = count;
+			if (pt->is_compact) {
+				GEM_BUG_ON(num_ptes % 16);
+				GEM_BUG_ON(pte % 16);
+				num_ptes /= 16;
+				pte /= 16;
+			}
+
 			vaddr = px_vaddr(pt);
-			memset64(vaddr + gen8_pd_index(start, 0),
+			memset64(vaddr + pte,
 				 vm->scratch[0]->encode,
-				 count);
+				 num_ptes);
 
 			atomic_sub(count, &pt->used);
 			start += count;
@@ -453,6 +463,96 @@ gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
 	return idx;
 }
 
+static void
+xehpsdv_ppgtt_insert_huge(struct i915_vma *vma,
+			  struct sgt_dma *iter,
+			  enum i915_cache_level cache_level,
+			  u32 flags)
+{
+	const gen8_pte_t pte_encode = vma->vm->pte_encode(0, cache_level, flags);
+	unsigned int rem = sg_dma_len(iter->sg);
+	u64 start = vma->node.start;
+
+	GEM_BUG_ON(!i915_vm_is_4lvl(vma->vm));
+
+	do {
+		struct i915_page_directory * const pdp =
+			gen8_pdp_for_page_address(vma->vm, start);
+		struct i915_page_directory * const pd =
+			i915_pd_entry(pdp, __gen8_pte_index(start, 2));
+		struct i915_page_table *pt =
+			i915_pt_entry(pd, __gen8_pte_index(start, 1));
+		gen8_pte_t encode = pte_encode;
+		unsigned int page_size;
+		gen8_pte_t *vaddr;
+		u16 index, max;
+
+		max = I915_PDES;
+
+		if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_2M &&
+		    IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) &&
+		    rem >= I915_GTT_PAGE_SIZE_2M &&
+		    !__gen8_pte_index(start, 0)) {
+			index = __gen8_pte_index(start, 1);
+			encode |= GEN8_PDE_PS_2M;
+			page_size = I915_GTT_PAGE_SIZE_2M;
+
+			vaddr = px_vaddr(pd);
+		} else {
+			if (encode & GEN12_PPGTT_PTE_LM) {
+				GEM_BUG_ON(!i915_gem_object_is_lmem(vma->obj));
+				GEM_BUG_ON(__gen8_pte_index(start, 0) % 16);
+				GEM_BUG_ON(rem < I915_GTT_PAGE_SIZE_64K);
+				GEM_BUG_ON(!IS_ALIGNED(iter->dma,
+						       I915_GTT_PAGE_SIZE_64K));
+
+				index = __gen8_pte_index(start, 0) / 16;
+				page_size = I915_GTT_PAGE_SIZE_64K;
+
+				max /= 16;
+
+				vaddr = px_vaddr(pd);
+				vaddr[__gen8_pte_index(start, 1)] |= GEN12_PDE_64K;
+
+				pt->is_compact = true;
+			} else {
+				GEM_BUG_ON(i915_gem_object_is_lmem(vma->obj));
+				GEM_BUG_ON(pt->is_compact);
+				index =  __gen8_pte_index(start, 0);
+				page_size = I915_GTT_PAGE_SIZE;
+			}
+
+			vaddr = px_vaddr(pt);
+		}
+
+		do {
+			GEM_BUG_ON(rem < page_size);
+			vaddr[index++] = encode | iter->dma;
+
+			start += page_size;
+			iter->dma += page_size;
+			rem -= page_size;
+			if (iter->dma >= iter->max) {
+				iter->sg = __sg_next(iter->sg);
+				if (!iter->sg)
+					break;
+
+				rem = sg_dma_len(iter->sg);
+				if (!rem)
+					break;
+
+				iter->dma = sg_dma_address(iter->sg);
+				iter->max = iter->dma + rem;
+
+				if (unlikely(!IS_ALIGNED(iter->dma, page_size)))
+					break;
+			}
+		} while (rem >= page_size && index < max);
+
+		vma->page_sizes.gtt |= page_size;
+	} while (iter->sg && sg_dma_len(iter->sg));
+}
+
 static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
 				   struct sgt_dma *iter,
 				   enum i915_cache_level cache_level,
@@ -585,7 +685,10 @@ static void gen8_ppgtt_insert(struct i915_address_space *vm,
 	struct sgt_dma iter = sgt_dma(vma);
 
 	if (vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
-		gen8_ppgtt_insert_huge(vma, &iter, cache_level, flags);
+		if (HAS_64K_PAGES(vm->i915))
+			xehpsdv_ppgtt_insert_huge(vma, &iter, cache_level, flags);
+		else
+			gen8_ppgtt_insert_huge(vma, &iter, cache_level, flags);
 	} else  {
 		u64 idx = vma->node.start >> GEN8_PTE_SHIFT;
 
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index b24a496c854e..ef6d5c70f4ff 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -91,6 +91,8 @@ typedef u64 gen8_pte_t;
 
 #define GEN12_GGTT_PTE_LM	BIT_ULL(1)
 
+#define GEN12_PDE_64K BIT(6)
+
 /*
  * Cacheability Control is a 4-bit value. The low three bits are stored in bits
  * 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE.
@@ -159,6 +161,7 @@ struct i915_page_table {
 		atomic_t used;
 		struct i915_page_table *stash;
 	};
+	bool is_compact;
 };
 
 struct i915_page_directory {
diff --git a/drivers/gpu/drm/i915/gt/intel_ppgtt.c b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
index 083b3090c69c..f4cb6544cfac 100644
--- a/drivers/gpu/drm/i915/gt/intel_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
@@ -26,6 +26,7 @@ struct i915_page_table *alloc_pt(struct i915_address_space *vm)
 		return ERR_PTR(-ENOMEM);
 	}
 
+	pt->is_compact = false;
 	atomic_set(&pt->used, 0);
 	return pt;
 }
-- 
2.25.1

[PATCH 2/4] drm/i915: support 64K GTT pages for discrete cards

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

discrete cards optimise 64K GTT pages for local-memory, since everything
should be allocated at 64K granularity. We say goodbye to sparse
entries, and instead get a compact 256B page-table for 64K pages,
which should be more cache friendly. 4K pages for local-memory
are no longer supported by the HW.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 .../gpu/drm/i915/gem/selftests/huge_pages.c   |  60 ++++++++++
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c          | 109 +++++++++++++++++-
 drivers/gpu/drm/i915/gt/intel_gtt.h           |   3 +
 drivers/gpu/drm/i915/gt/intel_ppgtt.c         |   1 +
 4 files changed, 170 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index 11f0aa65f8a3..ef3439b290ca 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -1483,6 +1483,65 @@ static int igt_ppgtt_sanity_check(void *arg)
 	return err;
 }
 
+static int igt_ppgtt_compact(void *arg)
+{
+	struct drm_i915_private *i915 = arg;
+	struct drm_i915_gem_object *obj;
+	int err;
+
+	/*
+	 * Simple test to catch issues with compact 64K pages -- since the pt is
+	 * compacted to 256B that gives us 32 entries per pt, however since the
+	 * backing page for the pt is 4K, any extra entries we might incorrectly
+	 * write out should be ignored by the HW. If ever hit such a case this
+	 * test should catch it since some of our writes would land in scratch.
+	 */
+
+	if (!HAS_64K_PAGES(i915)) {
+		pr_info("device lacks compact 64K page support, skipping\n");
+		return 0;
+	}
+
+	if (!HAS_LMEM(i915)) {
+		pr_info("device lacks LMEM support, skipping\n");
+		return 0;
+	}
+
+	/* We want the range to cover multiple page-table boundaries. */
+	obj = i915_gem_object_create_lmem(i915, SZ_4M, 0);
+	if (IS_ERR(obj))
+		return err;
+
+	err = i915_gem_object_pin_pages_unlocked(obj);
+	if (err)
+		goto out_put;
+
+	if (obj->mm.page_sizes.phys < I915_GTT_PAGE_SIZE_64K) {
+		pr_info("LMEM compact unable to allocate huge-page(s)\n");
+		goto out_unpin;
+	}
+
+	/*
+	 * Disable 2M GTT pages by forcing the page-size to 64K for the GTT
+	 * insertion.
+	 */
+	obj->mm.page_sizes.sg = I915_GTT_PAGE_SIZE_64K;
+
+	err = igt_write_huge(i915, obj);
+	if (err)
+		pr_err("LMEM compact write-huge failed\n");
+
+out_unpin:
+	i915_gem_object_unpin_pages(obj);
+out_put:
+	i915_gem_object_put(obj);
+
+	if (err == -ENOMEM)
+		err = 0;
+
+	return err;
+}
+
 static int igt_tmpfs_fallback(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
@@ -1740,6 +1799,7 @@ int i915_gem_huge_page_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(igt_tmpfs_fallback),
 		SUBTEST(igt_ppgtt_smoke_huge),
 		SUBTEST(igt_ppgtt_sanity_check),
+		SUBTEST(igt_ppgtt_compact),
 	};
 
 	if (!HAS_PPGTT(i915)) {
diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index b012c50f7ce7..8d081497e87e 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -233,6 +233,8 @@ static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
 						   start, end, lvl);
 		} else {
 			unsigned int count;
+			unsigned int pte = gen8_pd_index(start, 0);
+			unsigned int num_ptes;
 			u64 *vaddr;
 
 			count = gen8_pt_count(start, end);
@@ -242,10 +244,18 @@ static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
 			    atomic_read(&pt->used));
 			GEM_BUG_ON(!count || count >= atomic_read(&pt->used));
 
+			num_ptes = count;
+			if (pt->is_compact) {
+				GEM_BUG_ON(num_ptes % 16);
+				GEM_BUG_ON(pte % 16);
+				num_ptes /= 16;
+				pte /= 16;
+			}
+
 			vaddr = px_vaddr(pt);
-			memset64(vaddr + gen8_pd_index(start, 0),
+			memset64(vaddr + pte,
 				 vm->scratch[0]->encode,
-				 count);
+				 num_ptes);
 
 			atomic_sub(count, &pt->used);
 			start += count;
@@ -453,6 +463,96 @@ gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
 	return idx;
 }
 
+static void
+xehpsdv_ppgtt_insert_huge(struct i915_vma *vma,
+			  struct sgt_dma *iter,
+			  enum i915_cache_level cache_level,
+			  u32 flags)
+{
+	const gen8_pte_t pte_encode = vma->vm->pte_encode(0, cache_level, flags);
+	unsigned int rem = sg_dma_len(iter->sg);
+	u64 start = vma->node.start;
+
+	GEM_BUG_ON(!i915_vm_is_4lvl(vma->vm));
+
+	do {
+		struct i915_page_directory * const pdp =
+			gen8_pdp_for_page_address(vma->vm, start);
+		struct i915_page_directory * const pd =
+			i915_pd_entry(pdp, __gen8_pte_index(start, 2));
+		struct i915_page_table *pt =
+			i915_pt_entry(pd, __gen8_pte_index(start, 1));
+		gen8_pte_t encode = pte_encode;
+		unsigned int page_size;
+		gen8_pte_t *vaddr;
+		u16 index, max;
+
+		max = I915_PDES;
+
+		if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_2M &&
+		    IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) &&
+		    rem >= I915_GTT_PAGE_SIZE_2M &&
+		    !__gen8_pte_index(start, 0)) {
+			index = __gen8_pte_index(start, 1);
+			encode |= GEN8_PDE_PS_2M;
+			page_size = I915_GTT_PAGE_SIZE_2M;
+
+			vaddr = px_vaddr(pd);
+		} else {
+			if (encode & GEN12_PPGTT_PTE_LM) {
+				GEM_BUG_ON(!i915_gem_object_is_lmem(vma->obj));
+				GEM_BUG_ON(__gen8_pte_index(start, 0) % 16);
+				GEM_BUG_ON(rem < I915_GTT_PAGE_SIZE_64K);
+				GEM_BUG_ON(!IS_ALIGNED(iter->dma,
+						       I915_GTT_PAGE_SIZE_64K));
+
+				index = __gen8_pte_index(start, 0) / 16;
+				page_size = I915_GTT_PAGE_SIZE_64K;
+
+				max /= 16;
+
+				vaddr = px_vaddr(pd);
+				vaddr[__gen8_pte_index(start, 1)] |= GEN12_PDE_64K;
+
+				pt->is_compact = true;
+			} else {
+				GEM_BUG_ON(i915_gem_object_is_lmem(vma->obj));
+				GEM_BUG_ON(pt->is_compact);
+				index =  __gen8_pte_index(start, 0);
+				page_size = I915_GTT_PAGE_SIZE;
+			}
+
+			vaddr = px_vaddr(pt);
+		}
+
+		do {
+			GEM_BUG_ON(rem < page_size);
+			vaddr[index++] = encode | iter->dma;
+
+			start += page_size;
+			iter->dma += page_size;
+			rem -= page_size;
+			if (iter->dma >= iter->max) {
+				iter->sg = __sg_next(iter->sg);
+				if (!iter->sg)
+					break;
+
+				rem = sg_dma_len(iter->sg);
+				if (!rem)
+					break;
+
+				iter->dma = sg_dma_address(iter->sg);
+				iter->max = iter->dma + rem;
+
+				if (unlikely(!IS_ALIGNED(iter->dma, page_size)))
+					break;
+			}
+		} while (rem >= page_size && index < max);
+
+		vma->page_sizes.gtt |= page_size;
+	} while (iter->sg && sg_dma_len(iter->sg));
+}
+
 static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
 				   struct sgt_dma *iter,
 				   enum i915_cache_level cache_level,
@@ -585,7 +685,10 @@ static void gen8_ppgtt_insert(struct i915_address_space *vm,
 	struct sgt_dma iter = sgt_dma(vma);
 
 	if (vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
-		gen8_ppgtt_insert_huge(vma, &iter, cache_level, flags);
+		if (HAS_64K_PAGES(vm->i915))
+			xehpsdv_ppgtt_insert_huge(vma, &iter, cache_level, flags);
+		else
+			gen8_ppgtt_insert_huge(vma, &iter, cache_level, flags);
 	} else  {
 		u64 idx = vma->node.start >> GEN8_PTE_SHIFT;
 
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index b24a496c854e..ef6d5c70f4ff 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -91,6 +91,8 @@ typedef u64 gen8_pte_t;
 
 #define GEN12_GGTT_PTE_LM	BIT_ULL(1)
 
+#define GEN12_PDE_64K BIT(6)
+
 /*
  * Cacheability Control is a 4-bit value. The low three bits are stored in bits
  * 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE.
@@ -159,6 +161,7 @@ struct i915_page_table {
 		atomic_t used;
 		struct i915_page_table *stash;
 	};
+	bool is_compact;
 };
 
 struct i915_page_directory {
diff --git a/drivers/gpu/drm/i915/gt/intel_ppgtt.c b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
index 083b3090c69c..f4cb6544cfac 100644
--- a/drivers/gpu/drm/i915/gt/intel_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
@@ -26,6 +26,7 @@ struct i915_page_table *alloc_pt(struct i915_address_space *vm)
 		return ERR_PTR(-ENOMEM);
 	}
 
+	pt->is_compact = false;
 	atomic_set(&pt->used, 0);
 	return pt;
 }
-- 
2.25.1

[PATCH 3/4] drm/i915: add gtt misalignment test

[Robert Beckett]

add test to check handling of misaligned offsets and sizes

Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
---
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 130 ++++++++++++++++++
 1 file changed, 130 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index fea031b4ec4f..28de0b333835 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -22,10 +22,12 @@
  *
  */
 
+#include "gt/intel_gtt.h"
 #include <linux/list_sort.h>
 #include <linux/prime_numbers.h>
 
 #include "gem/i915_gem_context.h"
+#include "gem/i915_gem_region.h"
 #include "gem/selftests/mock_context.h"
 #include "gt/intel_context.h"
 #include "gt/intel_gpu_commands.h"
@@ -1066,6 +1068,120 @@ static int shrink_boom(struct i915_address_space *vm,
 	return err;
 }
 
+static int misaligned_case(struct i915_address_space *vm, struct intel_memory_region *mr,
+			   u64 addr, u64 size, unsigned long flags)
+{
+	struct drm_i915_gem_object *obj;
+	struct i915_vma *vma;
+	int err = 0;
+	u64 expected_vma_size, expected_node_size;
+
+	obj = i915_gem_object_create_region(mr, size, 0, 0);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	vma = i915_vma_instance(obj, vm, NULL);
+	if (IS_ERR(vma)) {
+		err = PTR_ERR(vma);
+		goto err_put;
+	}
+
+	err = i915_vma_pin(vma, 0, 0, addr | flags);
+	if (err)
+		goto err_put;
+	i915_vma_unpin(vma);
+
+	if (!drm_mm_node_allocated(&vma->node)) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
+	if (i915_vma_misplaced(vma, 0, 0, addr | flags)) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
+	expected_vma_size = round_up(size, 1 << (ffs(vma->page_sizes.gtt) - 1));
+	expected_node_size = expected_vma_size;
+
+	if (IS_DG2(vm->i915) && i915_gem_object_is_lmem(obj)) {
+		/* dg2 should expand lmem node to 2MB */
+		expected_vma_size = round_up(size, I915_GTT_PAGE_SIZE_64K);
+		expected_node_size = round_up(size, I915_GTT_PAGE_SIZE_2M);
+	}
+
+	if (vma->size != expected_vma_size || vma->node.size != expected_node_size) {
+		err = i915_vma_unbind(vma);
+		err = -EBADSLT;
+		goto err_put;
+	}
+
+	err = i915_vma_unbind(vma);
+	if (err)
+		goto err_put;
+
+	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
+
+err_put:
+	i915_gem_object_put(obj);
+	cleanup_freed_objects(vm->i915);
+	return err;
+}
+
+static int misaligned_pin(struct i915_address_space *vm,
+			  u64 hole_start, u64 hole_end,
+			  unsigned long end_time)
+{
+	struct intel_memory_region *mr;
+	enum intel_region_id id;
+	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
+	int err = 0;
+	u64 hole_size = hole_end - hole_start;
+
+	if (i915_is_ggtt(vm))
+		flags |= PIN_GLOBAL;
+
+	for_each_memory_region(mr, vm->i915, id) {
+		u64 min_alignment = i915_vm_min_alignment(vm, id);
+		u64 size = min_alignment;
+		u64 addr = round_up(hole_start + (hole_size / 2), min_alignment);
+
+		/* we can't test < 4k alignment due to flags being encoded in lower bits */
+		if (min_alignment != I915_GTT_PAGE_SIZE_4K) {
+			err = misaligned_case(vm, mr, addr + (min_alignment / 2), size, flags);
+			/* misaligned should error with -EINVAL*/
+			if (!err)
+				err = -EBADSLT;
+			if (err != -EINVAL)
+				return err;
+		}
+
+		/* test for vma->size expansion to min page size */
+		err = misaligned_case(vm, mr, addr, PAGE_SIZE, flags);
+		if (min_alignment > hole_size) {
+			if (!err)
+				err = -EBADSLT;
+			else if (err == -ENOSPC)
+				err = 0;
+		}
+		if (err)
+			return err;
+
+		/* test for intermediate size not expanding vma->size for large alignments */
+		err = misaligned_case(vm, mr, addr, size / 2, flags);
+		if (min_alignment > hole_size) {
+			if (!err)
+				err = -EBADSLT;
+			else if (err == -ENOSPC)
+				err = 0;
+		}
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
 static int exercise_ppgtt(struct drm_i915_private *dev_priv,
 			  int (*func)(struct i915_address_space *vm,
 				      u64 hole_start, u64 hole_end,
@@ -1135,6 +1251,12 @@ static int igt_ppgtt_shrink_boom(void *arg)
 	return exercise_ppgtt(arg, shrink_boom);
 }
 
+static int igt_ppgtt_misaligned_pin(void *arg)
+{
+	return exercise_ppgtt(arg, misaligned_pin);
+}
+
+
 static int sort_holes(void *priv, const struct list_head *A,
 		      const struct list_head *B)
 {
@@ -1207,6 +1329,12 @@ static int igt_ggtt_lowlevel(void *arg)
 	return exercise_ggtt(arg, lowlevel_hole);
 }
 
+static int igt_ggtt_misaligned_pin(void *arg)
+{
+	return exercise_ggtt(arg, misaligned_pin);
+}
+
+
 static int igt_ggtt_page(void *arg)
 {
 	const unsigned int count = PAGE_SIZE/sizeof(u32);
@@ -2137,12 +2265,14 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(igt_ppgtt_fill),
 		SUBTEST(igt_ppgtt_shrink),
 		SUBTEST(igt_ppgtt_shrink_boom),
+		SUBTEST(igt_ppgtt_misaligned_pin),
 		SUBTEST(igt_ggtt_lowlevel),
 		SUBTEST(igt_ggtt_drunk),
 		SUBTEST(igt_ggtt_walk),
 		SUBTEST(igt_ggtt_pot),
 		SUBTEST(igt_ggtt_fill),
 		SUBTEST(igt_ggtt_page),
+		SUBTEST(igt_ggtt_misaligned_pin),
 		SUBTEST(igt_cs_tlb),
 	};
 
-- 
2.25.1

[Intel-gfx] [PATCH 3/4] drm/i915: add gtt misalignment test

[Robert Beckett]

add test to check handling of misaligned offsets and sizes

Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
---
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 130 ++++++++++++++++++
 1 file changed, 130 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index fea031b4ec4f..28de0b333835 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -22,10 +22,12 @@
  *
  */
 
+#include "gt/intel_gtt.h"
 #include <linux/list_sort.h>
 #include <linux/prime_numbers.h>
 
 #include "gem/i915_gem_context.h"
+#include "gem/i915_gem_region.h"
 #include "gem/selftests/mock_context.h"
 #include "gt/intel_context.h"
 #include "gt/intel_gpu_commands.h"
@@ -1066,6 +1068,120 @@ static int shrink_boom(struct i915_address_space *vm,
 	return err;
 }
 
+static int misaligned_case(struct i915_address_space *vm, struct intel_memory_region *mr,
+			   u64 addr, u64 size, unsigned long flags)
+{
+	struct drm_i915_gem_object *obj;
+	struct i915_vma *vma;
+	int err = 0;
+	u64 expected_vma_size, expected_node_size;
+
+	obj = i915_gem_object_create_region(mr, size, 0, 0);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	vma = i915_vma_instance(obj, vm, NULL);
+	if (IS_ERR(vma)) {
+		err = PTR_ERR(vma);
+		goto err_put;
+	}
+
+	err = i915_vma_pin(vma, 0, 0, addr | flags);
+	if (err)
+		goto err_put;
+	i915_vma_unpin(vma);
+
+	if (!drm_mm_node_allocated(&vma->node)) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
+	if (i915_vma_misplaced(vma, 0, 0, addr | flags)) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
+	expected_vma_size = round_up(size, 1 << (ffs(vma->page_sizes.gtt) - 1));
+	expected_node_size = expected_vma_size;
+
+	if (IS_DG2(vm->i915) && i915_gem_object_is_lmem(obj)) {
+		/* dg2 should expand lmem node to 2MB */
+		expected_vma_size = round_up(size, I915_GTT_PAGE_SIZE_64K);
+		expected_node_size = round_up(size, I915_GTT_PAGE_SIZE_2M);
+	}
+
+	if (vma->size != expected_vma_size || vma->node.size != expected_node_size) {
+		err = i915_vma_unbind(vma);
+		err = -EBADSLT;
+		goto err_put;
+	}
+
+	err = i915_vma_unbind(vma);
+	if (err)
+		goto err_put;
+
+	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
+
+err_put:
+	i915_gem_object_put(obj);
+	cleanup_freed_objects(vm->i915);
+	return err;
+}
+
+static int misaligned_pin(struct i915_address_space *vm,
+			  u64 hole_start, u64 hole_end,
+			  unsigned long end_time)
+{
+	struct intel_memory_region *mr;
+	enum intel_region_id id;
+	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
+	int err = 0;
+	u64 hole_size = hole_end - hole_start;
+
+	if (i915_is_ggtt(vm))
+		flags |= PIN_GLOBAL;
+
+	for_each_memory_region(mr, vm->i915, id) {
+		u64 min_alignment = i915_vm_min_alignment(vm, id);
+		u64 size = min_alignment;
+		u64 addr = round_up(hole_start + (hole_size / 2), min_alignment);
+
+		/* we can't test < 4k alignment due to flags being encoded in lower bits */
+		if (min_alignment != I915_GTT_PAGE_SIZE_4K) {
+			err = misaligned_case(vm, mr, addr + (min_alignment / 2), size, flags);
+			/* misaligned should error with -EINVAL*/
+			if (!err)
+				err = -EBADSLT;
+			if (err != -EINVAL)
+				return err;
+		}
+
+		/* test for vma->size expansion to min page size */
+		err = misaligned_case(vm, mr, addr, PAGE_SIZE, flags);
+		if (min_alignment > hole_size) {
+			if (!err)
+				err = -EBADSLT;
+			else if (err == -ENOSPC)
+				err = 0;
+		}
+		if (err)
+			return err;
+
+		/* test for intermediate size not expanding vma->size for large alignments */
+		err = misaligned_case(vm, mr, addr, size / 2, flags);
+		if (min_alignment > hole_size) {
+			if (!err)
+				err = -EBADSLT;
+			else if (err == -ENOSPC)
+				err = 0;
+		}
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
 static int exercise_ppgtt(struct drm_i915_private *dev_priv,
 			  int (*func)(struct i915_address_space *vm,
 				      u64 hole_start, u64 hole_end,
@@ -1135,6 +1251,12 @@ static int igt_ppgtt_shrink_boom(void *arg)
 	return exercise_ppgtt(arg, shrink_boom);
 }
 
+static int igt_ppgtt_misaligned_pin(void *arg)
+{
+	return exercise_ppgtt(arg, misaligned_pin);
+}
+
+
 static int sort_holes(void *priv, const struct list_head *A,
 		      const struct list_head *B)
 {
@@ -1207,6 +1329,12 @@ static int igt_ggtt_lowlevel(void *arg)
 	return exercise_ggtt(arg, lowlevel_hole);
 }
 
+static int igt_ggtt_misaligned_pin(void *arg)
+{
+	return exercise_ggtt(arg, misaligned_pin);
+}
+
+
 static int igt_ggtt_page(void *arg)
 {
 	const unsigned int count = PAGE_SIZE/sizeof(u32);
@@ -2137,12 +2265,14 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(igt_ppgtt_fill),
 		SUBTEST(igt_ppgtt_shrink),
 		SUBTEST(igt_ppgtt_shrink_boom),
+		SUBTEST(igt_ppgtt_misaligned_pin),
 		SUBTEST(igt_ggtt_lowlevel),
 		SUBTEST(igt_ggtt_drunk),
 		SUBTEST(igt_ggtt_walk),
 		SUBTEST(igt_ggtt_pot),
 		SUBTEST(igt_ggtt_fill),
 		SUBTEST(igt_ggtt_page),
+		SUBTEST(igt_ggtt_misaligned_pin),
 		SUBTEST(igt_cs_tlb),
 	};
 
-- 
2.25.1

[PATCH 3/4] drm/i915: add gtt misalignment test

[Robert Beckett]

add test to check handling of misaligned offsets and sizes

Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
---
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 130 ++++++++++++++++++
 1 file changed, 130 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index fea031b4ec4f..28de0b333835 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -22,10 +22,12 @@
  *
  */
 
+#include "gt/intel_gtt.h"
 #include <linux/list_sort.h>
 #include <linux/prime_numbers.h>
 
 #include "gem/i915_gem_context.h"
+#include "gem/i915_gem_region.h"
 #include "gem/selftests/mock_context.h"
 #include "gt/intel_context.h"
 #include "gt/intel_gpu_commands.h"
@@ -1066,6 +1068,120 @@ static int shrink_boom(struct i915_address_space *vm,
 	return err;
 }
 
+static int misaligned_case(struct i915_address_space *vm, struct intel_memory_region *mr,
+			   u64 addr, u64 size, unsigned long flags)
+{
+	struct drm_i915_gem_object *obj;
+	struct i915_vma *vma;
+	int err = 0;
+	u64 expected_vma_size, expected_node_size;
+
+	obj = i915_gem_object_create_region(mr, size, 0, 0);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	vma = i915_vma_instance(obj, vm, NULL);
+	if (IS_ERR(vma)) {
+		err = PTR_ERR(vma);
+		goto err_put;
+	}
+
+	err = i915_vma_pin(vma, 0, 0, addr | flags);
+	if (err)
+		goto err_put;
+	i915_vma_unpin(vma);
+
+	if (!drm_mm_node_allocated(&vma->node)) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
+	if (i915_vma_misplaced(vma, 0, 0, addr | flags)) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
+	expected_vma_size = round_up(size, 1 << (ffs(vma->page_sizes.gtt) - 1));
+	expected_node_size = expected_vma_size;
+
+	if (IS_DG2(vm->i915) && i915_gem_object_is_lmem(obj)) {
+		/* dg2 should expand lmem node to 2MB */
+		expected_vma_size = round_up(size, I915_GTT_PAGE_SIZE_64K);
+		expected_node_size = round_up(size, I915_GTT_PAGE_SIZE_2M);
+	}
+
+	if (vma->size != expected_vma_size || vma->node.size != expected_node_size) {
+		err = i915_vma_unbind(vma);
+		err = -EBADSLT;
+		goto err_put;
+	}
+
+	err = i915_vma_unbind(vma);
+	if (err)
+		goto err_put;
+
+	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
+
+err_put:
+	i915_gem_object_put(obj);
+	cleanup_freed_objects(vm->i915);
+	return err;
+}
+
+static int misaligned_pin(struct i915_address_space *vm,
+			  u64 hole_start, u64 hole_end,
+			  unsigned long end_time)
+{
+	struct intel_memory_region *mr;
+	enum intel_region_id id;
+	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
+	int err = 0;
+	u64 hole_size = hole_end - hole_start;
+
+	if (i915_is_ggtt(vm))
+		flags |= PIN_GLOBAL;
+
+	for_each_memory_region(mr, vm->i915, id) {
+		u64 min_alignment = i915_vm_min_alignment(vm, id);
+		u64 size = min_alignment;
+		u64 addr = round_up(hole_start + (hole_size / 2), min_alignment);
+
+		/* we can't test < 4k alignment due to flags being encoded in lower bits */
+		if (min_alignment != I915_GTT_PAGE_SIZE_4K) {
+			err = misaligned_case(vm, mr, addr + (min_alignment / 2), size, flags);
+			/* misaligned should error with -EINVAL*/
+			if (!err)
+				err = -EBADSLT;
+			if (err != -EINVAL)
+				return err;
+		}
+
+		/* test for vma->size expansion to min page size */
+		err = misaligned_case(vm, mr, addr, PAGE_SIZE, flags);
+		if (min_alignment > hole_size) {
+			if (!err)
+				err = -EBADSLT;
+			else if (err == -ENOSPC)
+				err = 0;
+		}
+		if (err)
+			return err;
+
+		/* test for intermediate size not expanding vma->size for large alignments */
+		err = misaligned_case(vm, mr, addr, size / 2, flags);
+		if (min_alignment > hole_size) {
+			if (!err)
+				err = -EBADSLT;
+			else if (err == -ENOSPC)
+				err = 0;
+		}
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
 static int exercise_ppgtt(struct drm_i915_private *dev_priv,
 			  int (*func)(struct i915_address_space *vm,
 				      u64 hole_start, u64 hole_end,
@@ -1135,6 +1251,12 @@ static int igt_ppgtt_shrink_boom(void *arg)
 	return exercise_ppgtt(arg, shrink_boom);
 }
 
+static int igt_ppgtt_misaligned_pin(void *arg)
+{
+	return exercise_ppgtt(arg, misaligned_pin);
+}
+
+
 static int sort_holes(void *priv, const struct list_head *A,
 		      const struct list_head *B)
 {
@@ -1207,6 +1329,12 @@ static int igt_ggtt_lowlevel(void *arg)
 	return exercise_ggtt(arg, lowlevel_hole);
 }
 
+static int igt_ggtt_misaligned_pin(void *arg)
+{
+	return exercise_ggtt(arg, misaligned_pin);
+}
+
+
 static int igt_ggtt_page(void *arg)
 {
 	const unsigned int count = PAGE_SIZE/sizeof(u32);
@@ -2137,12 +2265,14 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(igt_ppgtt_fill),
 		SUBTEST(igt_ppgtt_shrink),
 		SUBTEST(igt_ppgtt_shrink_boom),
+		SUBTEST(igt_ppgtt_misaligned_pin),
 		SUBTEST(igt_ggtt_lowlevel),
 		SUBTEST(igt_ggtt_drunk),
 		SUBTEST(igt_ggtt_walk),
 		SUBTEST(igt_ggtt_pot),
 		SUBTEST(igt_ggtt_fill),
 		SUBTEST(igt_ggtt_page),
+		SUBTEST(igt_ggtt_misaligned_pin),
 		SUBTEST(igt_cs_tlb),
 	};
 
-- 
2.25.1

Re: [PATCH 3/4] drm/i915: add gtt misalignment test

[Ramalingam C]

On 2022-01-11 at 18:02:37 +0000, Robert Beckett wrote:
> add test to check handling of misaligned offsets and sizes

Bob, This needs the rebase. I have rebased the other three patches of
the series..

Meanwhile i will review the changes.

Ram.
> 
> Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
> ---
>  drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 130 ++++++++++++++++++
>  1 file changed, 130 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> index fea031b4ec4f..28de0b333835 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> @@ -22,10 +22,12 @@
>   *
>   */
>  
> +#include "gt/intel_gtt.h"
>  #include <linux/list_sort.h>
>  #include <linux/prime_numbers.h>
>  
>  #include "gem/i915_gem_context.h"
> +#include "gem/i915_gem_region.h"
>  #include "gem/selftests/mock_context.h"
>  #include "gt/intel_context.h"
>  #include "gt/intel_gpu_commands.h"
> @@ -1066,6 +1068,120 @@ static int shrink_boom(struct i915_address_space *vm,
>  	return err;
>  }
>  
> +static int misaligned_case(struct i915_address_space *vm, struct intel_memory_region *mr,
> +			   u64 addr, u64 size, unsigned long flags)
> +{
> +	struct drm_i915_gem_object *obj;
> +	struct i915_vma *vma;
> +	int err = 0;
> +	u64 expected_vma_size, expected_node_size;
> +
> +	obj = i915_gem_object_create_region(mr, size, 0, 0);
> +	if (IS_ERR(obj))
> +		return PTR_ERR(obj);
> +
> +	vma = i915_vma_instance(obj, vm, NULL);
> +	if (IS_ERR(vma)) {
> +		err = PTR_ERR(vma);
> +		goto err_put;
> +	}
> +
> +	err = i915_vma_pin(vma, 0, 0, addr | flags);
> +	if (err)
> +		goto err_put;
> +	i915_vma_unpin(vma);
> +
> +	if (!drm_mm_node_allocated(&vma->node)) {
> +		err = -EINVAL;
> +		goto err_put;
> +	}
> +
> +	if (i915_vma_misplaced(vma, 0, 0, addr | flags)) {
> +		err = -EINVAL;
> +		goto err_put;
> +	}
> +
> +	expected_vma_size = round_up(size, 1 << (ffs(vma->page_sizes.gtt) - 1));
> +	expected_node_size = expected_vma_size;
> +
> +	if (IS_DG2(vm->i915) && i915_gem_object_is_lmem(obj)) {
> +		/* dg2 should expand lmem node to 2MB */
> +		expected_vma_size = round_up(size, I915_GTT_PAGE_SIZE_64K);
> +		expected_node_size = round_up(size, I915_GTT_PAGE_SIZE_2M);
> +	}
> +
> +	if (vma->size != expected_vma_size || vma->node.size != expected_node_size) {
> +		err = i915_vma_unbind(vma);
> +		err = -EBADSLT;
> +		goto err_put;
> +	}
> +
> +	err = i915_vma_unbind(vma);
> +	if (err)
> +		goto err_put;
> +
> +	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
> +
> +err_put:
> +	i915_gem_object_put(obj);
> +	cleanup_freed_objects(vm->i915);
> +	return err;
> +}
> +
> +static int misaligned_pin(struct i915_address_space *vm,
> +			  u64 hole_start, u64 hole_end,
> +			  unsigned long end_time)
> +{
> +	struct intel_memory_region *mr;
> +	enum intel_region_id id;
> +	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
> +	int err = 0;
> +	u64 hole_size = hole_end - hole_start;
> +
> +	if (i915_is_ggtt(vm))
> +		flags |= PIN_GLOBAL;
> +
> +	for_each_memory_region(mr, vm->i915, id) {
> +		u64 min_alignment = i915_vm_min_alignment(vm, id);
> +		u64 size = min_alignment;
> +		u64 addr = round_up(hole_start + (hole_size / 2), min_alignment);
> +
> +		/* we can't test < 4k alignment due to flags being encoded in lower bits */
> +		if (min_alignment != I915_GTT_PAGE_SIZE_4K) {
> +			err = misaligned_case(vm, mr, addr + (min_alignment / 2), size, flags);
> +			/* misaligned should error with -EINVAL*/
> +			if (!err)
> +				err = -EBADSLT;
> +			if (err != -EINVAL)
> +				return err;
> +		}
> +
> +		/* test for vma->size expansion to min page size */
> +		err = misaligned_case(vm, mr, addr, PAGE_SIZE, flags);
> +		if (min_alignment > hole_size) {
> +			if (!err)
> +				err = -EBADSLT;
> +			else if (err == -ENOSPC)
> +				err = 0;
> +		}
> +		if (err)
> +			return err;
> +
> +		/* test for intermediate size not expanding vma->size for large alignments */
> +		err = misaligned_case(vm, mr, addr, size / 2, flags);
> +		if (min_alignment > hole_size) {
> +			if (!err)
> +				err = -EBADSLT;
> +			else if (err == -ENOSPC)
> +				err = 0;
> +		}
> +		if (err)
> +			return err;
> +	}
> +
> +	return 0;
> +}
> +
>  static int exercise_ppgtt(struct drm_i915_private *dev_priv,
>  			  int (*func)(struct i915_address_space *vm,
>  				      u64 hole_start, u64 hole_end,
> @@ -1135,6 +1251,12 @@ static int igt_ppgtt_shrink_boom(void *arg)
>  	return exercise_ppgtt(arg, shrink_boom);
>  }
>  
> +static int igt_ppgtt_misaligned_pin(void *arg)
> +{
> +	return exercise_ppgtt(arg, misaligned_pin);
> +}
> +
> +
>  static int sort_holes(void *priv, const struct list_head *A,
>  		      const struct list_head *B)
>  {
> @@ -1207,6 +1329,12 @@ static int igt_ggtt_lowlevel(void *arg)
>  	return exercise_ggtt(arg, lowlevel_hole);
>  }
>  
> +static int igt_ggtt_misaligned_pin(void *arg)
> +{
> +	return exercise_ggtt(arg, misaligned_pin);
> +}
> +
> +
>  static int igt_ggtt_page(void *arg)
>  {
>  	const unsigned int count = PAGE_SIZE/sizeof(u32);
> @@ -2137,12 +2265,14 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
>  		SUBTEST(igt_ppgtt_fill),
>  		SUBTEST(igt_ppgtt_shrink),
>  		SUBTEST(igt_ppgtt_shrink_boom),
> +		SUBTEST(igt_ppgtt_misaligned_pin),
>  		SUBTEST(igt_ggtt_lowlevel),
>  		SUBTEST(igt_ggtt_drunk),
>  		SUBTEST(igt_ggtt_walk),
>  		SUBTEST(igt_ggtt_pot),
>  		SUBTEST(igt_ggtt_fill),
>  		SUBTEST(igt_ggtt_page),
> +		SUBTEST(igt_ggtt_misaligned_pin),
>  		SUBTEST(igt_cs_tlb),
>  	};
>  
> -- 
> 2.25.1
> 

Re: [Intel-gfx] [PATCH 3/4] drm/i915: add gtt misalignment test

[Ramalingam C]

On 2022-01-11 at 18:02:37 +0000, Robert Beckett wrote:
> add test to check handling of misaligned offsets and sizes

Bob, This needs the rebase. I have rebased the other three patches of
the series..

Meanwhile i will review the changes.

Ram.
> 
> Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
> ---
>  drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 130 ++++++++++++++++++
>  1 file changed, 130 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> index fea031b4ec4f..28de0b333835 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> @@ -22,10 +22,12 @@
>   *
>   */
>  
> +#include "gt/intel_gtt.h"
>  #include <linux/list_sort.h>
>  #include <linux/prime_numbers.h>
>  
>  #include "gem/i915_gem_context.h"
> +#include "gem/i915_gem_region.h"
>  #include "gem/selftests/mock_context.h"
>  #include "gt/intel_context.h"
>  #include "gt/intel_gpu_commands.h"
> @@ -1066,6 +1068,120 @@ static int shrink_boom(struct i915_address_space *vm,
>  	return err;
>  }
>  
> +static int misaligned_case(struct i915_address_space *vm, struct intel_memory_region *mr,
> +			   u64 addr, u64 size, unsigned long flags)
> +{
> +	struct drm_i915_gem_object *obj;
> +	struct i915_vma *vma;
> +	int err = 0;
> +	u64 expected_vma_size, expected_node_size;
> +
> +	obj = i915_gem_object_create_region(mr, size, 0, 0);
> +	if (IS_ERR(obj))
> +		return PTR_ERR(obj);
> +
> +	vma = i915_vma_instance(obj, vm, NULL);
> +	if (IS_ERR(vma)) {
> +		err = PTR_ERR(vma);
> +		goto err_put;
> +	}
> +
> +	err = i915_vma_pin(vma, 0, 0, addr | flags);
> +	if (err)
> +		goto err_put;
> +	i915_vma_unpin(vma);
> +
> +	if (!drm_mm_node_allocated(&vma->node)) {
> +		err = -EINVAL;
> +		goto err_put;
> +	}
> +
> +	if (i915_vma_misplaced(vma, 0, 0, addr | flags)) {
> +		err = -EINVAL;
> +		goto err_put;
> +	}
> +
> +	expected_vma_size = round_up(size, 1 << (ffs(vma->page_sizes.gtt) - 1));
> +	expected_node_size = expected_vma_size;
> +
> +	if (IS_DG2(vm->i915) && i915_gem_object_is_lmem(obj)) {
> +		/* dg2 should expand lmem node to 2MB */
> +		expected_vma_size = round_up(size, I915_GTT_PAGE_SIZE_64K);
> +		expected_node_size = round_up(size, I915_GTT_PAGE_SIZE_2M);
> +	}
> +
> +	if (vma->size != expected_vma_size || vma->node.size != expected_node_size) {
> +		err = i915_vma_unbind(vma);
> +		err = -EBADSLT;
> +		goto err_put;
> +	}
> +
> +	err = i915_vma_unbind(vma);
> +	if (err)
> +		goto err_put;
> +
> +	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
> +
> +err_put:
> +	i915_gem_object_put(obj);
> +	cleanup_freed_objects(vm->i915);
> +	return err;
> +}
> +
> +static int misaligned_pin(struct i915_address_space *vm,
> +			  u64 hole_start, u64 hole_end,
> +			  unsigned long end_time)
> +{
> +	struct intel_memory_region *mr;
> +	enum intel_region_id id;
> +	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
> +	int err = 0;
> +	u64 hole_size = hole_end - hole_start;
> +
> +	if (i915_is_ggtt(vm))
> +		flags |= PIN_GLOBAL;
> +
> +	for_each_memory_region(mr, vm->i915, id) {
> +		u64 min_alignment = i915_vm_min_alignment(vm, id);
> +		u64 size = min_alignment;
> +		u64 addr = round_up(hole_start + (hole_size / 2), min_alignment);
> +
> +		/* we can't test < 4k alignment due to flags being encoded in lower bits */
> +		if (min_alignment != I915_GTT_PAGE_SIZE_4K) {
> +			err = misaligned_case(vm, mr, addr + (min_alignment / 2), size, flags);
> +			/* misaligned should error with -EINVAL*/
> +			if (!err)
> +				err = -EBADSLT;
> +			if (err != -EINVAL)
> +				return err;
> +		}
> +
> +		/* test for vma->size expansion to min page size */
> +		err = misaligned_case(vm, mr, addr, PAGE_SIZE, flags);
> +		if (min_alignment > hole_size) {
> +			if (!err)
> +				err = -EBADSLT;
> +			else if (err == -ENOSPC)
> +				err = 0;
> +		}
> +		if (err)
> +			return err;
> +
> +		/* test for intermediate size not expanding vma->size for large alignments */
> +		err = misaligned_case(vm, mr, addr, size / 2, flags);
> +		if (min_alignment > hole_size) {
> +			if (!err)
> +				err = -EBADSLT;
> +			else if (err == -ENOSPC)
> +				err = 0;
> +		}
> +		if (err)
> +			return err;
> +	}
> +
> +	return 0;
> +}
> +
>  static int exercise_ppgtt(struct drm_i915_private *dev_priv,
>  			  int (*func)(struct i915_address_space *vm,
>  				      u64 hole_start, u64 hole_end,
> @@ -1135,6 +1251,12 @@ static int igt_ppgtt_shrink_boom(void *arg)
>  	return exercise_ppgtt(arg, shrink_boom);
>  }
>  
> +static int igt_ppgtt_misaligned_pin(void *arg)
> +{
> +	return exercise_ppgtt(arg, misaligned_pin);
> +}
> +
> +
>  static int sort_holes(void *priv, const struct list_head *A,
>  		      const struct list_head *B)
>  {
> @@ -1207,6 +1329,12 @@ static int igt_ggtt_lowlevel(void *arg)
>  	return exercise_ggtt(arg, lowlevel_hole);
>  }
>  
> +static int igt_ggtt_misaligned_pin(void *arg)
> +{
> +	return exercise_ggtt(arg, misaligned_pin);
> +}
> +
> +
>  static int igt_ggtt_page(void *arg)
>  {
>  	const unsigned int count = PAGE_SIZE/sizeof(u32);
> @@ -2137,12 +2265,14 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
>  		SUBTEST(igt_ppgtt_fill),
>  		SUBTEST(igt_ppgtt_shrink),
>  		SUBTEST(igt_ppgtt_shrink_boom),
> +		SUBTEST(igt_ppgtt_misaligned_pin),
>  		SUBTEST(igt_ggtt_lowlevel),
>  		SUBTEST(igt_ggtt_drunk),
>  		SUBTEST(igt_ggtt_walk),
>  		SUBTEST(igt_ggtt_pot),
>  		SUBTEST(igt_ggtt_fill),
>  		SUBTEST(igt_ggtt_page),
> +		SUBTEST(igt_ggtt_misaligned_pin),
>  		SUBTEST(igt_cs_tlb),
>  	};
>  
> -- 
> 2.25.1
> 

Re: [PATCH 3/4] drm/i915: add gtt misalignment test

[Ramalingam C]

On 2022-01-11 at 18:02:37 +0000, Robert Beckett wrote:
> add test to check handling of misaligned offsets and sizes

Bob, This needs the rebase. I have rebased the other three patches of
the series..

Meanwhile i will review the changes.

Ram.
> 
> Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
> ---
>  drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 130 ++++++++++++++++++
>  1 file changed, 130 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> index fea031b4ec4f..28de0b333835 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> @@ -22,10 +22,12 @@
>   *
>   */
>  
> +#include "gt/intel_gtt.h"
>  #include <linux/list_sort.h>
>  #include <linux/prime_numbers.h>
>  
>  #include "gem/i915_gem_context.h"
> +#include "gem/i915_gem_region.h"
>  #include "gem/selftests/mock_context.h"
>  #include "gt/intel_context.h"
>  #include "gt/intel_gpu_commands.h"
> @@ -1066,6 +1068,120 @@ static int shrink_boom(struct i915_address_space *vm,
>  	return err;
>  }
>  
> +static int misaligned_case(struct i915_address_space *vm, struct intel_memory_region *mr,
> +			   u64 addr, u64 size, unsigned long flags)
> +{
> +	struct drm_i915_gem_object *obj;
> +	struct i915_vma *vma;
> +	int err = 0;
> +	u64 expected_vma_size, expected_node_size;
> +
> +	obj = i915_gem_object_create_region(mr, size, 0, 0);
> +	if (IS_ERR(obj))
> +		return PTR_ERR(obj);
> +
> +	vma = i915_vma_instance(obj, vm, NULL);
> +	if (IS_ERR(vma)) {
> +		err = PTR_ERR(vma);
> +		goto err_put;
> +	}
> +
> +	err = i915_vma_pin(vma, 0, 0, addr | flags);
> +	if (err)
> +		goto err_put;
> +	i915_vma_unpin(vma);
> +
> +	if (!drm_mm_node_allocated(&vma->node)) {
> +		err = -EINVAL;
> +		goto err_put;
> +	}
> +
> +	if (i915_vma_misplaced(vma, 0, 0, addr | flags)) {
> +		err = -EINVAL;
> +		goto err_put;
> +	}
> +
> +	expected_vma_size = round_up(size, 1 << (ffs(vma->page_sizes.gtt) - 1));
> +	expected_node_size = expected_vma_size;
> +
> +	if (IS_DG2(vm->i915) && i915_gem_object_is_lmem(obj)) {
> +		/* dg2 should expand lmem node to 2MB */
> +		expected_vma_size = round_up(size, I915_GTT_PAGE_SIZE_64K);
> +		expected_node_size = round_up(size, I915_GTT_PAGE_SIZE_2M);
> +	}
> +
> +	if (vma->size != expected_vma_size || vma->node.size != expected_node_size) {
> +		err = i915_vma_unbind(vma);
> +		err = -EBADSLT;
> +		goto err_put;
> +	}
> +
> +	err = i915_vma_unbind(vma);
> +	if (err)
> +		goto err_put;
> +
> +	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
> +
> +err_put:
> +	i915_gem_object_put(obj);
> +	cleanup_freed_objects(vm->i915);
> +	return err;
> +}
> +
> +static int misaligned_pin(struct i915_address_space *vm,
> +			  u64 hole_start, u64 hole_end,
> +			  unsigned long end_time)
> +{
> +	struct intel_memory_region *mr;
> +	enum intel_region_id id;
> +	unsigned long flags = PIN_OFFSET_FIXED | PIN_USER;
> +	int err = 0;
> +	u64 hole_size = hole_end - hole_start;
> +
> +	if (i915_is_ggtt(vm))
> +		flags |= PIN_GLOBAL;
> +
> +	for_each_memory_region(mr, vm->i915, id) {
> +		u64 min_alignment = i915_vm_min_alignment(vm, id);
> +		u64 size = min_alignment;
> +		u64 addr = round_up(hole_start + (hole_size / 2), min_alignment);
> +
> +		/* we can't test < 4k alignment due to flags being encoded in lower bits */
> +		if (min_alignment != I915_GTT_PAGE_SIZE_4K) {
> +			err = misaligned_case(vm, mr, addr + (min_alignment / 2), size, flags);
> +			/* misaligned should error with -EINVAL*/
> +			if (!err)
> +				err = -EBADSLT;
> +			if (err != -EINVAL)
> +				return err;
> +		}
> +
> +		/* test for vma->size expansion to min page size */
> +		err = misaligned_case(vm, mr, addr, PAGE_SIZE, flags);
> +		if (min_alignment > hole_size) {
> +			if (!err)
> +				err = -EBADSLT;
> +			else if (err == -ENOSPC)
> +				err = 0;
> +		}
> +		if (err)
> +			return err;
> +
> +		/* test for intermediate size not expanding vma->size for large alignments */
> +		err = misaligned_case(vm, mr, addr, size / 2, flags);
> +		if (min_alignment > hole_size) {
> +			if (!err)
> +				err = -EBADSLT;
> +			else if (err == -ENOSPC)
> +				err = 0;
> +		}
> +		if (err)
> +			return err;
> +	}
> +
> +	return 0;
> +}
> +
>  static int exercise_ppgtt(struct drm_i915_private *dev_priv,
>  			  int (*func)(struct i915_address_space *vm,
>  				      u64 hole_start, u64 hole_end,
> @@ -1135,6 +1251,12 @@ static int igt_ppgtt_shrink_boom(void *arg)
>  	return exercise_ppgtt(arg, shrink_boom);
>  }
>  
> +static int igt_ppgtt_misaligned_pin(void *arg)
> +{
> +	return exercise_ppgtt(arg, misaligned_pin);
> +}
> +
> +
>  static int sort_holes(void *priv, const struct list_head *A,
>  		      const struct list_head *B)
>  {
> @@ -1207,6 +1329,12 @@ static int igt_ggtt_lowlevel(void *arg)
>  	return exercise_ggtt(arg, lowlevel_hole);
>  }
>  
> +static int igt_ggtt_misaligned_pin(void *arg)
> +{
> +	return exercise_ggtt(arg, misaligned_pin);
> +}
> +
> +
>  static int igt_ggtt_page(void *arg)
>  {
>  	const unsigned int count = PAGE_SIZE/sizeof(u32);
> @@ -2137,12 +2265,14 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
>  		SUBTEST(igt_ppgtt_fill),
>  		SUBTEST(igt_ppgtt_shrink),
>  		SUBTEST(igt_ppgtt_shrink_boom),
> +		SUBTEST(igt_ppgtt_misaligned_pin),
>  		SUBTEST(igt_ggtt_lowlevel),
>  		SUBTEST(igt_ggtt_drunk),
>  		SUBTEST(igt_ggtt_walk),
>  		SUBTEST(igt_ggtt_pot),
>  		SUBTEST(igt_ggtt_fill),
>  		SUBTEST(igt_ggtt_page),
> +		SUBTEST(igt_ggtt_misaligned_pin),
>  		SUBTEST(igt_cs_tlb),
>  	};
>  
> -- 
> 2.25.1
> 

[PATCH 4/4] drm/i915/uapi: document behaviour for DG2 64K support

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

On discrete platforms like DG2, we need to support a minimum page size
of 64K when dealing with device local-memory. This is quite tricky for
various reasons, so try to document the new implicit uapi for this.

v2: Fixed suggestions on formatting [Daniel]

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
cc: Simon Ser <contact@emersion.fr>
cc: Pekka Paalanen <ppaalanen@gmail.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Cc: mesa-dev@lists.freedesktop.org
Cc: Tony Ye <tony.ye@intel.com>
Cc: Slawomir Milczarek <slawomir.milczarek@intel.com>
---
 include/uapi/drm/i915_drm.h | 44 ++++++++++++++++++++++++++++++++-----
 1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 5e678917da70..486b7b96291e 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1118,10 +1118,16 @@ struct drm_i915_gem_exec_object2 {
 	/**
 	 * When the EXEC_OBJECT_PINNED flag is specified this is populated by
 	 * the user with the GTT offset at which this object will be pinned.
+	 *
 	 * When the I915_EXEC_NO_RELOC flag is specified this must contain the
 	 * presumed_offset of the object.
+	 *
 	 * During execbuffer2 the kernel populates it with the value of the
 	 * current GTT offset of the object, for future presumed_offset writes.
+	 *
+	 * See struct drm_i915_gem_create_ext for the rules when dealing with
+	 * alignment restrictions with I915_MEMORY_CLASS_DEVICE, on devices with
+	 * minimum page sizes, like DG2.
 	 */
 	__u64 offset;
 
@@ -3145,11 +3151,39 @@ struct drm_i915_gem_create_ext {
 	 *
 	 * The (page-aligned) allocated size for the object will be returned.
 	 *
-	 * Note that for some devices we have might have further minimum
-	 * page-size restrictions(larger than 4K), like for device local-memory.
-	 * However in general the final size here should always reflect any
-	 * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS
-	 * extension to place the object in device local-memory.
+	 *
+	 * **DG2 64K min page size implications:**
+	 *
+	 * On discrete platforms, starting from DG2, we have to contend with GTT
+	 * page size restrictions when dealing with I915_MEMORY_CLASS_DEVICE
+	 * objects.  Specifically the hardware only supports 64K or larger GTT
+	 * page sizes for such memory. The kernel will already ensure that all
+	 * I915_MEMORY_CLASS_DEVICE memory is allocated using 64K or larger page
+	 * sizes underneath.
+	 *
+	 * Note that the returned size here will always reflect any required
+	 * rounding up done by the kernel, i.e 4K will now become 64K on devices
+	 * such as DG2.
+	 *
+	 * **Special DG2 GTT address alignment requirement:**
+	 *
+	 * The GTT alignment will also need be at least 2M for  such objects.
+	 *
+	 * Note that due to how the hardware implements 64K GTT page support, we
+	 * have some further complications:
+	 *
+	 *   1) The entire PDE(which covers a 2MB virtual address range), must
+	 *   contain only 64K PTEs, i.e mixing 4K and 64K PTEs in the same
+	 *   PDE is forbidden by the hardware.
+	 *
+	 *   2) We still need to support 4K PTEs for I915_MEMORY_CLASS_SYSTEM
+	 *   objects.
+	 *
+	 * To keep things simple for userland, we mandate that any GTT mappings
+	 * must be aligned to and rounded up to 2MB. As this only wastes virtual
+	 * address space and avoids userland having to copy any needlessly
+	 * complicated PDE sharing scheme (coloring) and only affects GD2, this
+	 * id deemed to be a good compromise.
 	 */
 	__u64 size;
 	/**
-- 
2.25.1

[Intel-gfx] [PATCH 4/4] drm/i915/uapi: document behaviour for DG2 64K support

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

On discrete platforms like DG2, we need to support a minimum page size
of 64K when dealing with device local-memory. This is quite tricky for
various reasons, so try to document the new implicit uapi for this.

v2: Fixed suggestions on formatting [Daniel]

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
cc: Simon Ser <contact@emersion.fr>
cc: Pekka Paalanen <ppaalanen@gmail.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Cc: mesa-dev@lists.freedesktop.org
Cc: Tony Ye <tony.ye@intel.com>
Cc: Slawomir Milczarek <slawomir.milczarek@intel.com>
---
 include/uapi/drm/i915_drm.h | 44 ++++++++++++++++++++++++++++++++-----
 1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 5e678917da70..486b7b96291e 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1118,10 +1118,16 @@ struct drm_i915_gem_exec_object2 {
 	/**
 	 * When the EXEC_OBJECT_PINNED flag is specified this is populated by
 	 * the user with the GTT offset at which this object will be pinned.
+	 *
 	 * When the I915_EXEC_NO_RELOC flag is specified this must contain the
 	 * presumed_offset of the object.
+	 *
 	 * During execbuffer2 the kernel populates it with the value of the
 	 * current GTT offset of the object, for future presumed_offset writes.
+	 *
+	 * See struct drm_i915_gem_create_ext for the rules when dealing with
+	 * alignment restrictions with I915_MEMORY_CLASS_DEVICE, on devices with
+	 * minimum page sizes, like DG2.
 	 */
 	__u64 offset;
 
@@ -3145,11 +3151,39 @@ struct drm_i915_gem_create_ext {
 	 *
 	 * The (page-aligned) allocated size for the object will be returned.
 	 *
-	 * Note that for some devices we have might have further minimum
-	 * page-size restrictions(larger than 4K), like for device local-memory.
-	 * However in general the final size here should always reflect any
-	 * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS
-	 * extension to place the object in device local-memory.
+	 *
+	 * **DG2 64K min page size implications:**
+	 *
+	 * On discrete platforms, starting from DG2, we have to contend with GTT
+	 * page size restrictions when dealing with I915_MEMORY_CLASS_DEVICE
+	 * objects.  Specifically the hardware only supports 64K or larger GTT
+	 * page sizes for such memory. The kernel will already ensure that all
+	 * I915_MEMORY_CLASS_DEVICE memory is allocated using 64K or larger page
+	 * sizes underneath.
+	 *
+	 * Note that the returned size here will always reflect any required
+	 * rounding up done by the kernel, i.e 4K will now become 64K on devices
+	 * such as DG2.
+	 *
+	 * **Special DG2 GTT address alignment requirement:**
+	 *
+	 * The GTT alignment will also need be at least 2M for  such objects.
+	 *
+	 * Note that due to how the hardware implements 64K GTT page support, we
+	 * have some further complications:
+	 *
+	 *   1) The entire PDE(which covers a 2MB virtual address range), must
+	 *   contain only 64K PTEs, i.e mixing 4K and 64K PTEs in the same
+	 *   PDE is forbidden by the hardware.
+	 *
+	 *   2) We still need to support 4K PTEs for I915_MEMORY_CLASS_SYSTEM
+	 *   objects.
+	 *
+	 * To keep things simple for userland, we mandate that any GTT mappings
+	 * must be aligned to and rounded up to 2MB. As this only wastes virtual
+	 * address space and avoids userland having to copy any needlessly
+	 * complicated PDE sharing scheme (coloring) and only affects GD2, this
+	 * id deemed to be a good compromise.
 	 */
 	__u64 size;
 	/**
-- 
2.25.1

[PATCH 4/4] drm/i915/uapi: document behaviour for DG2 64K support

[Robert Beckett]

From: Matthew Auld <matthew.auld@intel.com>

On discrete platforms like DG2, we need to support a minimum page size
of 64K when dealing with device local-memory. This is quite tricky for
various reasons, so try to document the new implicit uapi for this.

v2: Fixed suggestions on formatting [Daniel]

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
cc: Simon Ser <contact@emersion.fr>
cc: Pekka Paalanen <ppaalanen@gmail.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Cc: mesa-dev@lists.freedesktop.org
Cc: Tony Ye <tony.ye@intel.com>
Cc: Slawomir Milczarek <slawomir.milczarek@intel.com>
---
 include/uapi/drm/i915_drm.h | 44 ++++++++++++++++++++++++++++++++-----
 1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 5e678917da70..486b7b96291e 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1118,10 +1118,16 @@ struct drm_i915_gem_exec_object2 {
 	/**
 	 * When the EXEC_OBJECT_PINNED flag is specified this is populated by
 	 * the user with the GTT offset at which this object will be pinned.
+	 *
 	 * When the I915_EXEC_NO_RELOC flag is specified this must contain the
 	 * presumed_offset of the object.
+	 *
 	 * During execbuffer2 the kernel populates it with the value of the
 	 * current GTT offset of the object, for future presumed_offset writes.
+	 *
+	 * See struct drm_i915_gem_create_ext for the rules when dealing with
+	 * alignment restrictions with I915_MEMORY_CLASS_DEVICE, on devices with
+	 * minimum page sizes, like DG2.
 	 */
 	__u64 offset;
 
@@ -3145,11 +3151,39 @@ struct drm_i915_gem_create_ext {
 	 *
 	 * The (page-aligned) allocated size for the object will be returned.
 	 *
-	 * Note that for some devices we have might have further minimum
-	 * page-size restrictions(larger than 4K), like for device local-memory.
-	 * However in general the final size here should always reflect any
-	 * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS
-	 * extension to place the object in device local-memory.
+	 *
+	 * **DG2 64K min page size implications:**
+	 *
+	 * On discrete platforms, starting from DG2, we have to contend with GTT
+	 * page size restrictions when dealing with I915_MEMORY_CLASS_DEVICE
+	 * objects.  Specifically the hardware only supports 64K or larger GTT
+	 * page sizes for such memory. The kernel will already ensure that all
+	 * I915_MEMORY_CLASS_DEVICE memory is allocated using 64K or larger page
+	 * sizes underneath.
+	 *
+	 * Note that the returned size here will always reflect any required
+	 * rounding up done by the kernel, i.e 4K will now become 64K on devices
+	 * such as DG2.
+	 *
+	 * **Special DG2 GTT address alignment requirement:**
+	 *
+	 * The GTT alignment will also need be at least 2M for  such objects.
+	 *
+	 * Note that due to how the hardware implements 64K GTT page support, we
+	 * have some further complications:
+	 *
+	 *   1) The entire PDE(which covers a 2MB virtual address range), must
+	 *   contain only 64K PTEs, i.e mixing 4K and 64K PTEs in the same
+	 *   PDE is forbidden by the hardware.
+	 *
+	 *   2) We still need to support 4K PTEs for I915_MEMORY_CLASS_SYSTEM
+	 *   objects.
+	 *
+	 * To keep things simple for userland, we mandate that any GTT mappings
+	 * must be aligned to and rounded up to 2MB. As this only wastes virtual
+	 * address space and avoids userland having to copy any needlessly
+	 * complicated PDE sharing scheme (coloring) and only affects GD2, this
+	 * id deemed to be a good compromise.
 	 */
 	__u64 size;
 	/**
-- 
2.25.1

[Intel-gfx] ✗ Fi.CI.BUILD: failure for dicsrete card 64K page support

[Patchwork]

== Series Details ==

Series: dicsrete card 64K page support
URL   : https://patchwork.freedesktop.org/series/98758/
State : failure

== Summary ==

Applying: drm/i915: enforce min GTT alignment for discrete cards
Using index info to reconstruct a base tree...
M	drivers/gpu/drm/i915/gt/intel_gtt.c
M	drivers/gpu/drm/i915/gt/intel_gtt.h
M	drivers/gpu/drm/i915/i915_vma.c
M	drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
Falling back to patching base and 3-way merge...
Auto-merging drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
Auto-merging drivers/gpu/drm/i915/i915_vma.c
Auto-merging drivers/gpu/drm/i915/gt/intel_gtt.h
Auto-merging drivers/gpu/drm/i915/gt/intel_gtt.c
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 drm/i915: enforce min GTT alignment for discrete cards
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".