[Intel-gfx] [PATCH v2 1/4] drm/i915: Create stolen memory region from local memory

[Matthew Auld <matthew.auld@intel.com>]

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

Add "REGION_STOLEN" device info to dg1, create stolen memory
region from upper portion of local device memory, starting
from DSMBASE.

v2:
    - s/drm_info/drm_dbg; userspace likely doesn't care about stolen.
    - mem->type is only setup after the region probe, so setting the name
      as stolen-local or stolen-system based on this value won't work. Split
      system vs local stolen setup to fix this.
    - kill all the region->devmem/is_devmem stuff. We already differentiate
      the different types of stolen so such things shouldn't be needed
      anymore.

Signed-off-by: CQ Tang <cq.tang@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 90 ++++++++++++++++++++--
 drivers/gpu/drm/i915/gem/i915_gem_stolen.h |  3 +
 drivers/gpu/drm/i915/i915_pci.c            |  2 +-
 drivers/gpu/drm/i915/i915_reg.h            |  1 +
 drivers/gpu/drm/i915/intel_memory_region.c |  6 ++
 drivers/gpu/drm/i915/intel_memory_region.h |  5 +-
 6 files changed, 97 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index c5f85296a45f..dfc3076abd0c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -10,6 +10,7 @@
 #include <drm/drm_mm.h>
 #include <drm/i915_drm.h>
 
+#include "gem/i915_gem_lmem.h"
 #include "gem/i915_gem_region.h"
 #include "i915_drv.h"
 #include "i915_gem_stolen.h"
@@ -121,6 +122,14 @@ static int i915_adjust_stolen(struct drm_i915_private *i915,
 		}
 	}
 
+	/*
+	 * With device local memory, we don't need to check the address range,
+	 * this is device memory physical address, could overlap with system
+	 * memory.
+	 */
+	if (HAS_LMEM(i915))
+		return 0;
+
 	/*
 	 * Verify that nothing else uses this physical address. Stolen
 	 * memory should be reserved by the BIOS and hidden from the
@@ -682,17 +691,30 @@ static int _i915_gem_object_stolen_init(struct intel_memory_region *mem,
 	return ret;
 }
 
+struct intel_memory_region *i915_stolen_region(struct drm_i915_private *i915)
+{
+	if (HAS_LMEM(i915))
+		return i915->mm.regions[INTEL_REGION_STOLEN_LMEM];
+
+	return i915->mm.regions[INTEL_REGION_STOLEN_SMEM];
+}
+
 struct drm_i915_gem_object *
 i915_gem_object_create_stolen(struct drm_i915_private *i915,
 			      resource_size_t size)
 {
-	return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_STOLEN_SMEM],
+	return i915_gem_object_create_region(i915_stolen_region(i915),
 					     size, I915_BO_ALLOC_CONTIGUOUS);
 }
 
 static int init_stolen(struct intel_memory_region *mem)
 {
-	intel_memory_region_set_name(mem, "stolen");
+	if (HAS_LMEM(mem->i915)) {
+		if (!io_mapping_init_wc(&mem->iomap,
+					mem->io_start,
+					resource_size(&mem->region)))
+			return -EIO;
+	}
 
 	/*
 	 * Initialise stolen early so that we may reserve preallocated
@@ -712,13 +734,65 @@ static const struct intel_memory_region_ops i915_region_stolen_ops = {
 	.init_object = _i915_gem_object_stolen_init,
 };
 
+static struct intel_memory_region *
+setup_lmem_stolen(struct drm_i915_private *i915)
+{
+	struct intel_uncore *uncore = &i915->uncore;
+	struct pci_dev *pdev = i915->drm.pdev;
+	struct intel_memory_region *mem;
+	resource_size_t io_start;
+	resource_size_t lmem_size;
+	u64 lmem_base;
+
+	if (!IS_DGFX(i915))
+		return ERR_PTR(-ENODEV);
+
+	lmem_base = intel_uncore_read64(uncore, GEN12_DSMBASE);
+	lmem_size = pci_resource_len(pdev, 2) - lmem_base;
+	io_start = pci_resource_start(pdev, 2) + lmem_base;
+
+	mem = intel_memory_region_create(i915, lmem_base, lmem_size,
+					 I915_GTT_PAGE_SIZE_4K, io_start,
+					 &i915_region_stolen_ops);
+	if (IS_ERR(mem))
+		return mem;
+
+	drm_dbg(&i915->drm, "Stolen Local memory: %pR\n", &mem->region);
+	drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n",
+		&mem->io_start);
+
+	intel_memory_region_set_name(mem, "stolen-local");
+
+	return mem;
+}
+
+static struct intel_memory_region*
+setup_smem_stolen(struct drm_i915_private *i915)
+{
+	struct intel_memory_region *mem;
+
+	mem = intel_memory_region_create(i915,
+					 intel_graphics_stolen_res.start,
+					 resource_size(&intel_graphics_stolen_res),
+					 PAGE_SIZE, 0,
+					 &i915_region_stolen_ops);
+	if (IS_ERR(mem))
+		return mem;
+
+	intel_memory_region_set_name(mem, "stolen-system");
+
+	return mem;
+}
+
 struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915)
 {
-	return intel_memory_region_create(i915,
-					  intel_graphics_stolen_res.start,
-					  resource_size(&intel_graphics_stolen_res),
-					  PAGE_SIZE, 0,
-					  &i915_region_stolen_ops);
+	struct intel_memory_region *mem;
+
+	mem = setup_lmem_stolen(i915);
+	if (mem == ERR_PTR(-ENODEV))
+		mem = setup_smem_stolen(i915);
+
+	return mem;
 }
 
 struct drm_i915_gem_object *
@@ -726,7 +800,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
 					       resource_size_t stolen_offset,
 					       resource_size_t size)
 {
-	struct intel_memory_region *mem = i915->mm.regions[INTEL_REGION_STOLEN_SMEM];
+	struct intel_memory_region *mem = i915_stolen_region(i915);
 	struct drm_i915_gem_object *obj;
 	struct drm_mm_node *stolen;
 	int ret;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
index b03489706796..2d1ce7fec61c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
@@ -22,6 +22,9 @@ int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
 				 struct drm_mm_node *node);
 struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915);
+
+struct intel_memory_region *i915_stolen_region(struct drm_i915_private *i915);
+
 struct drm_i915_gem_object *
 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
 			      resource_size_t size);
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index d09db36b8287..c8309fb5e307 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -906,7 +906,7 @@ static const struct intel_device_info rkl_info = {
 
 #define GEN12_DGFX_FEATURES \
 	GEN12_FEATURES, \
-	.memory_regions = REGION_SMEM | REGION_LMEM, \
+	.memory_regions = REGION_SMEM | REGION_LMEM | REGION_STOLEN_LMEM, \
 	.has_master_unit_irq = 1, \
 	.has_llc = 0, \
 	.has_snoop = 1, \
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 224ad897af34..22e4ad440238 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12164,6 +12164,7 @@ enum skl_power_gate {
 #define GEN12_GLOBAL_MOCS(i)	_MMIO(0x4000 + (i) * 4) /* Global MOCS regs */
 
 #define GEN12_GSMBASE			_MMIO(0x108100)
+#define GEN12_DSMBASE			_MMIO(0x1080C0)
 
 /* gamt regs */
 #define GEN8_L3_LRA_1_GPGPU _MMIO(0x4dd4)
diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index bf837b6bb185..ac90b76a3fa0 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -22,6 +22,10 @@ static const struct {
 		.class = INTEL_MEMORY_STOLEN_SYSTEM,
 		.instance = 0,
 	},
+	[INTEL_REGION_STOLEN_LMEM] = {
+		.class = INTEL_MEMORY_STOLEN_LOCAL,
+		.instance = 0,
+	},
 };
 
 struct intel_memory_region *
@@ -278,6 +282,8 @@ int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
 		case INTEL_MEMORY_SYSTEM:
 			mem = i915_gem_shmem_setup(i915);
 			break;
+		case INTEL_MEMORY_STOLEN_LOCAL:
+			fallthrough;
 		case INTEL_MEMORY_STOLEN_SYSTEM:
 			mem = i915_gem_stolen_setup(i915);
 			break;
diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
index edd49067c8ca..4c8ec15af55f 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.h
+++ b/drivers/gpu/drm/i915/intel_memory_region.h
@@ -26,18 +26,21 @@ enum intel_memory_type {
 	INTEL_MEMORY_SYSTEM = 0,
 	INTEL_MEMORY_LOCAL,
 	INTEL_MEMORY_STOLEN_SYSTEM,
+	INTEL_MEMORY_STOLEN_LOCAL,
 };
 
 enum intel_region_id {
 	INTEL_REGION_SMEM = 0,
 	INTEL_REGION_LMEM,
 	INTEL_REGION_STOLEN_SMEM,
+	INTEL_REGION_STOLEN_LMEM,
 	INTEL_REGION_UNKNOWN, /* Should be last */
 };
 
 #define REGION_SMEM     BIT(INTEL_REGION_SMEM)
 #define REGION_LMEM     BIT(INTEL_REGION_LMEM)
 #define REGION_STOLEN_SMEM   BIT(INTEL_REGION_STOLEN_SMEM)
+#define REGION_STOLEN_LMEM   BIT(INTEL_REGION_STOLEN_LMEM)
 
 #define I915_ALLOC_MIN_PAGE_SIZE  BIT(0)
 #define I915_ALLOC_CONTIGUOUS     BIT(1)
@@ -82,7 +85,7 @@ struct intel_memory_region {
 	u16 type;
 	u16 instance;
 	enum intel_region_id id;
-	char name[8];
+	char name[16];
 
 	struct list_head reserved;
 
-- 
2.26.2

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