[Intel-gfx] [PATCH v4 1/8] drm/i915: make local-memory probing a GT operation

[Intel-gfx] [PATCH v4 1/8] drm/i915: make local-memory probing a GT operation

[Matthew Auld]

Device local memory is very much a GT thing, therefore it should be the
responsibility of the GT to setup the device local memory region.

Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_gt.c          | 32 +++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_gt.h          |  1 +
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 10 +++++--
 drivers/gpu/drm/i915/gt/intel_region_lmem.h |  4 +--
 drivers/gpu/drm/i915/i915_drv.c             |  4 +++
 drivers/gpu/drm/i915/intel_memory_region.c  |  5 ++--
 6 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index d8e1ab412634..edbee9991248 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -39,6 +39,38 @@ void intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915)
 	intel_uc_init_early(&gt->uc);
 }
 
+int intel_gt_probe_lmem(struct intel_gt *gt)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	struct intel_memory_region *mem;
+	int id;
+	int err;
+
+	mem = intel_gt_setup_fake_lmem(gt);
+	if (IS_ERR(mem)) {
+		err = PTR_ERR(mem);
+		if (err == -ENODEV)
+			return 0;
+
+		drm_err(&i915->drm,
+			"Failed to setup region(%d) type=%d\n",
+			err, INTEL_MEMORY_LOCAL);
+		return err;
+	}
+
+	id = INTEL_REGION_LMEM;
+
+	mem->id = id;
+	mem->type = INTEL_MEMORY_LOCAL;
+	mem->instance = 0;
+
+	GEM_BUG_ON(!HAS_REGION(i915, id));
+	GEM_BUG_ON(i915->mm.regions[id]);
+	i915->mm.regions[id] = mem;
+
+	return 0;
+}
+
 void intel_gt_init_hw_early(struct intel_gt *gt, struct i915_ggtt *ggtt)
 {
 	gt->ggtt = ggtt;
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index 9157c7411f60..a17bd8b3195f 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -36,6 +36,7 @@ static inline struct intel_gt *huc_to_gt(struct intel_huc *huc)
 
 void intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915);
 void intel_gt_init_hw_early(struct intel_gt *gt, struct i915_ggtt *ggtt);
+int intel_gt_probe_lmem(struct intel_gt *gt);
 int intel_gt_init_mmio(struct intel_gt *gt);
 int __must_check intel_gt_init_hw(struct intel_gt *gt);
 int intel_gt_init(struct intel_gt *gt);
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index 28a1d5e1fb92..a2401e1fe1a3 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -102,16 +102,22 @@ static const struct intel_memory_region_ops intel_region_lmem_ops = {
 };
 
 struct intel_memory_region *
-intel_setup_fake_lmem(struct drm_i915_private *i915)
+intel_gt_setup_fake_lmem(struct intel_gt *gt)
 {
+	struct drm_i915_private *i915 = gt->i915;
 	struct pci_dev *pdev = i915->drm.pdev;
 	struct intel_memory_region *mem;
 	resource_size_t mappable_end;
 	resource_size_t io_start;
 	resource_size_t start;
 
+	if (!HAS_LMEM(i915))
+		return ERR_PTR(-ENODEV);
+
+	if (!i915->params.fake_lmem_start)
+		return ERR_PTR(-ENODEV);
+
 	GEM_BUG_ON(i915_ggtt_has_aperture(&i915->ggtt));
-	GEM_BUG_ON(!i915->params.fake_lmem_start);
 
 	/* Your mappable aperture belongs to me now! */
 	mappable_end = pci_resource_len(pdev, 2);
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.h b/drivers/gpu/drm/i915/gt/intel_region_lmem.h
index 8ea43e538dab..a4baa0f077a1 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.h
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.h
@@ -6,9 +6,9 @@
 #ifndef __INTEL_REGION_LMEM_H
 #define __INTEL_REGION_LMEM_H
 
-struct drm_i915_private;
+struct intel_gt;
 
 struct intel_memory_region *
-intel_setup_fake_lmem(struct drm_i915_private *i915);
+intel_gt_setup_fake_lmem(struct intel_gt *gt);
 
 #endif /* !__INTEL_REGION_LMEM_H */
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0037b81d991e..49d94ffe4796 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -576,6 +576,10 @@ static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
 
 	intel_gt_init_hw_early(&dev_priv->gt, &dev_priv->ggtt);
 
+	ret = intel_gt_probe_lmem(&dev_priv->gt);
+	if (ret)
+		goto err_mem_regions;
+
 	ret = i915_ggtt_enable_hw(dev_priv);
 	if (ret) {
 		drm_err(&dev_priv->drm, "failed to enable GGTT\n");
diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index 1bfcdd89b241..b1b610bfff09 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -258,9 +258,8 @@ int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
 		case INTEL_MEMORY_STOLEN:
 			mem = i915_gem_stolen_setup(i915);
 			break;
-		case INTEL_MEMORY_LOCAL:
-			mem = intel_setup_fake_lmem(i915);
-			break;
+		default:
+			continue;
 		}
 
 		if (IS_ERR(mem)) {
-- 
2.26.2

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[Intel-gfx] [PATCH v4 2/8] drm/i915: setup the LMEM region

[Matthew Auld]

Hook up the LMEM region. Addresses will start from zero, and for CPU
access we get LMEM_BAR which is just a 1:1 mapping of said region.

Based on a patch from Michel Thierry.

v2 by Jani:
- use intel_uncore_read/intel_uncore_write
- remove trailing blank line

v3: s/drm_info/drm_dbg for info which in non-pertinent for the user

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_gt.c          |  4 ++-
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 35 +++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_region_lmem.h |  2 ++
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index edbee9991248..9ac67e0534b7 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -46,7 +46,9 @@ int intel_gt_probe_lmem(struct intel_gt *gt)
 	int id;
 	int err;
 
-	mem = intel_gt_setup_fake_lmem(gt);
+	mem = intel_gt_setup_lmem(gt);
+	if (mem == ERR_PTR(-ENODEV))
+		mem = intel_gt_setup_fake_lmem(gt);
 	if (IS_ERR(mem)) {
 		err = PTR_ERR(mem);
 		if (err == -ENODEV)
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index a2401e1fe1a3..b3d1d0abb956 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -142,3 +142,38 @@ intel_gt_setup_fake_lmem(struct intel_gt *gt)
 
 	return mem;
 }
+
+static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	struct pci_dev *pdev = i915->drm.pdev;
+	struct intel_memory_region *mem;
+	resource_size_t io_start;
+	resource_size_t size;
+
+	if (!IS_DGFX(i915))
+		return ERR_PTR(-ENODEV);
+
+	io_start = pci_resource_start(pdev, 2);
+	size = pci_resource_len(pdev, 2);
+
+	mem = intel_memory_region_create(i915,
+					 0,
+					 size,
+					 I915_GTT_PAGE_SIZE_4K,
+					 io_start,
+					 &intel_region_lmem_ops);
+	if (!IS_ERR(mem)) {
+		drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region);
+		drm_dbg(&i915->drm, "Local memory IO start: %pa\n",
+			&mem->io_start);
+		drm_info(&i915->drm, "Local memory available: %pa\n", &size);
+	}
+
+	return mem;
+}
+
+struct intel_memory_region *intel_gt_setup_lmem(struct intel_gt *gt)
+{
+	return setup_lmem(gt);
+}
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.h b/drivers/gpu/drm/i915/gt/intel_region_lmem.h
index a4baa0f077a1..062d0542ae34 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.h
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.h
@@ -8,6 +8,8 @@
 
 struct intel_gt;
 
+struct intel_memory_region *intel_gt_setup_lmem(struct intel_gt *gt);
+
 struct intel_memory_region *
 intel_gt_setup_fake_lmem(struct intel_gt *gt);
 
-- 
2.26.2

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[Intel-gfx] [PATCH v4 3/8] drm/i915: reserve stolen for LMEM region

[Matthew Auld]

From: CQ Tang <cq.tang@intel.com>

The lmem region needs to remove the stolen part, which should just be a
case of snipping it off the end.

Signed-off-by: CQ Tang <cq.tang@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 13 +++++++++----
 drivers/gpu/drm/i915/i915_reg.h             |  2 ++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index b3d1d0abb956..71bb38706dbf 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -146,20 +146,24 @@ intel_gt_setup_fake_lmem(struct intel_gt *gt)
 static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
 {
 	struct drm_i915_private *i915 = gt->i915;
+	struct intel_uncore *uncore = gt->uncore;
 	struct pci_dev *pdev = i915->drm.pdev;
 	struct intel_memory_region *mem;
 	resource_size_t io_start;
-	resource_size_t size;
+	resource_size_t lmem_size;
 
 	if (!IS_DGFX(i915))
 		return ERR_PTR(-ENODEV);
 
+	/* Stolen starts from GSMBASE on DG1 */
+	lmem_size = intel_uncore_read64(uncore, GEN12_GSMBASE);
+
 	io_start = pci_resource_start(pdev, 2);
-	size = pci_resource_len(pdev, 2);
+	GEM_BUG_ON(lmem_size > pci_resource_len(pdev, 2));
 
 	mem = intel_memory_region_create(i915,
 					 0,
-					 size,
+					 lmem_size,
 					 I915_GTT_PAGE_SIZE_4K,
 					 io_start,
 					 &intel_region_lmem_ops);
@@ -167,7 +171,8 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
 		drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region);
 		drm_dbg(&i915->drm, "Local memory IO start: %pa\n",
 			&mem->io_start);
-		drm_info(&i915->drm, "Local memory available: %pa\n", &size);
+		drm_info(&i915->drm, "Local memory available: %pa\n",
+			 &lmem_size);
 	}
 
 	return mem;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index aa872446337b..b39b46a974b5 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12160,6 +12160,8 @@ enum skl_power_gate {
 
 #define GEN12_GLOBAL_MOCS(i)	_MMIO(0x4000 + (i) * 4) /* Global MOCS regs */
 
+#define GEN12_GSMBASE			_MMIO(0x108100)
+
 /* gamt regs */
 #define GEN8_L3_LRA_1_GPGPU _MMIO(0x4dd4)
 #define   GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW  0x67F1427F /* max/min for LRA1/2 */
-- 
2.26.2

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[Intel-gfx] [PATCH v4 4/8] drm/i915: introduce mem->reserved

[Matthew Auld]

From: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>

In the following patch we need to reserve regions unaccessible to the
driver during initialization, so add mem->reserved for collecting such
regions.

v2: turn into an actual intel_memory_region_reserve api

Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_memory_region.c    | 14 ++++
 drivers/gpu/drm/i915/intel_memory_region.h    |  5 ++
 .../drm/i915/selftests/intel_memory_region.c  | 77 +++++++++++++++++++
 3 files changed, 96 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index b1b610bfff09..49d306b5532f 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -156,9 +156,22 @@ int intel_memory_region_init_buddy(struct intel_memory_region *mem)
 
 void intel_memory_region_release_buddy(struct intel_memory_region *mem)
 {
+	i915_buddy_free_list(&mem->mm, &mem->reserved);
 	i915_buddy_fini(&mem->mm);
 }
 
+int intel_memory_region_reserve(struct intel_memory_region *mem,
+				u64 offset, u64 size)
+{
+	int ret;
+
+	mutex_lock(&mem->mm_lock);
+	ret = i915_buddy_alloc_range(&mem->mm, &mem->reserved, offset, size);
+	mutex_unlock(&mem->mm_lock);
+
+	return ret;
+}
+
 struct intel_memory_region *
 intel_memory_region_create(struct drm_i915_private *i915,
 			   resource_size_t start,
@@ -185,6 +198,7 @@ intel_memory_region_create(struct drm_i915_private *i915,
 	mutex_init(&mem->objects.lock);
 	INIT_LIST_HEAD(&mem->objects.list);
 	INIT_LIST_HEAD(&mem->objects.purgeable);
+	INIT_LIST_HEAD(&mem->reserved);
 
 	mutex_init(&mem->mm_lock);
 
diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
index 6ffc0673f005..d17e4fe3123c 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.h
+++ b/drivers/gpu/drm/i915/intel_memory_region.h
@@ -89,6 +89,8 @@ struct intel_memory_region {
 	unsigned int id;
 	char name[8];
 
+	struct list_head reserved;
+
 	dma_addr_t remap_addr;
 
 	struct {
@@ -113,6 +115,9 @@ void __intel_memory_region_put_pages_buddy(struct intel_memory_region *mem,
 					   struct list_head *blocks);
 void __intel_memory_region_put_block_buddy(struct i915_buddy_block *block);
 
+int intel_memory_region_reserve(struct intel_memory_region *mem,
+				u64 offset, u64 size);
+
 struct intel_memory_region *
 intel_memory_region_create(struct drm_i915_private *i915,
 			   resource_size_t start,
diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index ce7adfa3bca0..64348528e1d5 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -144,6 +144,82 @@ static bool is_contiguous(struct drm_i915_gem_object *obj)
 	return true;
 }
 
+static int igt_mock_reserve(void *arg)
+{
+	struct intel_memory_region *mem = arg;
+	resource_size_t avail = resource_size(&mem->region);
+	struct drm_i915_gem_object *obj;
+	const u32 chunk_size = SZ_32M;
+	u32 i, offset, count, *order;
+	u64 allocated, cur_avail;
+	I915_RND_STATE(prng);
+	LIST_HEAD(objects);
+	int err = 0;
+
+	if (!list_empty(&mem->reserved)) {
+		pr_err("%s region reserved list is not empty\n", __func__);
+		return -EINVAL;
+	}
+
+	count = avail / chunk_size;
+	order = i915_random_order(count, &prng);
+	if (!order)
+		return 0;
+
+	/* Reserve a bunch of ranges within the region */
+	for (i = 0; i < count; ++i) {
+		u64 start = order[i] * chunk_size;
+		u64 size = i915_prandom_u32_max_state(chunk_size, &prng);
+
+		/* Allow for some really big holes */
+		if (!size)
+			continue;
+
+		size = round_up(size, PAGE_SIZE);
+		offset = igt_random_offset(&prng, 0, chunk_size, size,
+					   PAGE_SIZE);
+
+		err = intel_memory_region_reserve(mem, start + offset, size);
+		if (err) {
+			pr_err("%s failed to reserve range", __func__);
+			goto out_close;
+		}
+
+		/* XXX: maybe sanity check the block range here? */
+		avail -= size;
+	}
+
+	/* Try to see if we can allocate from the remaining space */
+	allocated = 0;
+	cur_avail = avail;
+	do {
+		u32 size = i915_prandom_u32_max_state(cur_avail, &prng);
+
+		size = max_t(u32, round_up(size, PAGE_SIZE), PAGE_SIZE);
+		obj = igt_object_create(mem, &objects, size, 0);
+		if (IS_ERR(obj)) {
+			if (PTR_ERR(obj) == -ENXIO)
+				break;
+
+			err = PTR_ERR(obj);
+			goto out_close;
+		}
+		cur_avail -= size;
+		allocated += size;
+	} while (1);
+
+	if (allocated != avail) {
+		pr_err("%s mismatch between allocation and free space", __func__);
+		err = -EINVAL;
+	}
+
+out_close:
+	kfree(order);
+	close_objects(mem, &objects);
+	i915_buddy_free_list(&mem->mm, &mem->reserved);
+	return err;
+}
+
 static int igt_mock_contiguous(void *arg)
 {
 	struct intel_memory_region *mem = arg;
@@ -930,6 +1006,7 @@ static int perf_memcpy(void *arg)
 int intel_memory_region_mock_selftests(void)
 {
 	static const struct i915_subtest tests[] = {
+		SUBTEST(igt_mock_reserve),
 		SUBTEST(igt_mock_fill),
 		SUBTEST(igt_mock_contiguous),
 		SUBTEST(igt_mock_splintered_region),
-- 
2.26.2

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[Intel-gfx] [PATCH v4 5/8] drm/i915/dg1: Reserve first 1MB of local memory

[Matthew Auld]

From: Imre Deak <imre.deak@intel.com>

On DG1 A0/B0 steppings the first 1MB of local memory must be reserved.
One reason for this is that the 0xA0000-0xB0000 range is not accessible
by the display, probably since this region is redirected to another
memory location for legacy VGA compatibility.

BSpec: 50586
Testcase: igt/kms_big_fb/linear-64bpp-rotate-0

v2:
- Reserve the memory on B0 as well.

v3: replace DRM_DEBUG/DRM_ERROR with drm_dbg/drm_err

v4: fix the insanity

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 45 +++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index 71bb38706dbf..763b21980d74 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -143,6 +143,41 @@ intel_gt_setup_fake_lmem(struct intel_gt *gt)
 	return mem;
 }
 
+static bool get_legacy_lowmem_region(struct intel_uncore *uncore,
+				     u64 *start, u32 *size)
+{
+	if (!IS_DG1_REVID(uncore->i915, DG1_REVID_A0, DG1_REVID_B0))
+		return false;
+
+	*start = 0;
+	*size = SZ_1M;
+
+	drm_dbg(&uncore->i915->drm, "LMEM: reserved legacy low-memory [0x%llx-0x%llx]\n",
+		*start, *start + *size);
+
+	return true;
+}
+
+static int reserve_lowmem_region(struct intel_uncore *uncore,
+				 struct intel_memory_region *mem)
+{
+	u64 reserve_start;
+	u32 reserve_size;
+	int ret;
+
+	if (!get_legacy_lowmem_region(uncore, &reserve_start, &reserve_size))
+		return 0;
+
+	if (!reserve_size)
+		return 0;
+
+	ret = intel_memory_region_reserve(mem, reserve_start, reserve_size);
+	if (ret)
+		drm_err(&uncore->i915->drm, "LMEM: reserving low memory region failed\n");
+
+	return ret;
+}
+
 static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
 {
 	struct drm_i915_private *i915 = gt->i915;
@@ -167,6 +202,16 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
 					 I915_GTT_PAGE_SIZE_4K,
 					 io_start,
 					 &intel_region_lmem_ops);
+	if (!IS_ERR(mem)) {
+		int err;
+
+		err = reserve_lowmem_region(uncore, mem);
+		if (err) {
+			intel_memory_region_put(mem);
+			return ERR_PTR(err);
+		}
+	}
+
 	if (!IS_ERR(mem)) {
 		drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region);
 		drm_dbg(&i915->drm, "Local memory IO start: %pa\n",
-- 
2.26.2

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[Intel-gfx] [PATCH v4 6/8] drm/i915: allocate context from LMEM

[Matthew Auld]

Prefer allocating the context from LMEM on dgfx.

Based on a patch from Michel Thierry.

v2: flatten the chain

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 33b529dcb05f..8508b8d701c1 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -3,6 +3,8 @@
  * Copyright © 2014 Intel Corporation
  */
 
+#include "gem/i915_gem_lmem.h"
+
 #include "gen8_engine_cs.h"
 #include "i915_drv.h"
 #include "i915_perf.h"
@@ -808,7 +810,9 @@ __lrc_alloc_state(struct intel_context *ce, struct intel_engine_cs *engine)
 		context_size += PAGE_SIZE;
 	}
 
-	obj = i915_gem_object_create_shmem(engine->i915, context_size);
+	obj = i915_gem_object_create_lmem(engine->i915, context_size, 0);
+	if (IS_ERR(obj))
+		obj = i915_gem_object_create_shmem(engine->i915, context_size);
 	if (IS_ERR(obj))
 		return ERR_CAST(obj);
 
-- 
2.26.2

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[Intel-gfx] [PATCH v4 7/8] drm/i915: move engine scratch to LMEM

[Matthew Auld]

Prefer allocating the engine scratch from LMEM on dgfx.

v2: flatten the chain

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_gt.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 9ac67e0534b7..35ff68ada4f1 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -4,6 +4,8 @@
  */
 
 #include "debugfs_gt.h"
+
+#include "gem/i915_gem_lmem.h"
 #include "i915_drv.h"
 #include "intel_context.h"
 #include "intel_gt.h"
@@ -378,11 +380,13 @@ static int intel_gt_init_scratch(struct intel_gt *gt, unsigned int size)
 	struct i915_vma *vma;
 	int ret;
 
-	obj = i915_gem_object_create_stolen(i915, size);
+	obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_VOLATILE);
+	if (IS_ERR(obj))
+		obj = i915_gem_object_create_stolen(i915, size);
 	if (IS_ERR(obj))
 		obj = i915_gem_object_create_internal(i915, size);
 	if (IS_ERR(obj)) {
-		DRM_ERROR("Failed to allocate scratch page\n");
+		drm_err(&i915->drm, "Failed to allocate scratch page\n");
 		return PTR_ERR(obj);
 	}
 
-- 
2.26.2

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[Intel-gfx] [PATCH v4 8/8] drm/i915: allocate cmd ring in lmem

[Matthew Auld]

From: Michel Thierry <michel.thierry@intel.com>

Prefer allocating the cmd ring from LMEM on dgfx.

Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_ring.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_ring.c b/drivers/gpu/drm/i915/gt/intel_ring.c
index 29c87b3c23bc..aee0a77c77e0 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring.c
@@ -3,6 +3,7 @@
  * Copyright © 2019 Intel Corporation
  */
 
+#include "gem/i915_gem_lmem.h"
 #include "gem/i915_gem_object.h"
 
 #include "i915_drv.h"
@@ -108,8 +109,8 @@ static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size)
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 
-	obj = ERR_PTR(-ENODEV);
-	if (i915_ggtt_has_aperture(ggtt))
+	obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_VOLATILE);
+	if (IS_ERR(obj) && i915_ggtt_has_aperture(ggtt))
 		obj = i915_gem_object_create_stolen(i915, size);
 	if (IS_ERR(obj))
 		obj = i915_gem_object_create_internal(i915, size);
-- 
2.26.2

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Re: [Intel-gfx] [PATCH v4 5/8] drm/i915/dg1: Reserve first 1MB of local memory

[Chris Wilson]

Quoting Matthew Auld (2021-01-27 12:48:06)
> From: Imre Deak <imre.deak@intel.com>
> 
> On DG1 A0/B0 steppings the first 1MB of local memory must be reserved.
> One reason for this is that the 0xA0000-0xB0000 range is not accessible
> by the display, probably since this region is redirected to another
> memory location for legacy VGA compatibility.
> 
> BSpec: 50586
> Testcase: igt/kms_big_fb/linear-64bpp-rotate-0
> 
> v2:
> - Reserve the memory on B0 as well.
> 
> v3: replace DRM_DEBUG/DRM_ERROR with drm_dbg/drm_err
> 
> v4: fix the insanity
> 
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> Signed-off-by: Matthew Auld <matthew.auld@intel.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_region_lmem.c | 45 +++++++++++++++++++++
>  1 file changed, 45 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> index 71bb38706dbf..763b21980d74 100644
> --- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> +++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> @@ -143,6 +143,41 @@ intel_gt_setup_fake_lmem(struct intel_gt *gt)
>         return mem;
>  }
>  
> +static bool get_legacy_lowmem_region(struct intel_uncore *uncore,
> +                                    u64 *start, u32 *size)
> +{
> +       if (!IS_DG1_REVID(uncore->i915, DG1_REVID_A0, DG1_REVID_B0))
> +               return false;
> +
> +       *start = 0;
> +       *size = SZ_1M;
> +
> +       drm_dbg(&uncore->i915->drm, "LMEM: reserved legacy low-memory [0x%llx-0x%llx]\n",
> +               *start, *start + *size);
> +
> +       return true;
> +}
> +
> +static int reserve_lowmem_region(struct intel_uncore *uncore,
> +                                struct intel_memory_region *mem)
> +{
> +       u64 reserve_start;
> +       u32 reserve_size;
> +       int ret;
> +
> +       if (!get_legacy_lowmem_region(uncore, &reserve_start, &reserve_size))
> +               return 0;
> +
> +       if (!reserve_size)
> +               return 0;

We can remove this check now as well since we can be assured it is
handled for us by get_legacy_lowmem_region()

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
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Re: [Intel-gfx] [PATCH v4 5/8] drm/i915/dg1: Reserve first 1MB of local memory

[Chris Wilson]

Quoting Matthew Auld (2021-01-27 12:48:06)
>  static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
>  {
>         struct drm_i915_private *i915 = gt->i915;
> @@ -167,6 +202,16 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
>                                          I915_GTT_PAGE_SIZE_4K,
>                                          io_start,
>                                          &intel_region_lmem_ops);
> +       if (!IS_ERR(mem)) {
> +               int err;
> +
> +               err = reserve_lowmem_region(uncore, mem);
> +               if (err) {
> +                       intel_memory_region_put(mem);
> +                       return ERR_PTR(err);

Just a worry here, are we likely to antagonise Joonas by having multiple
error paths?
-Chris
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