[PATCH v2 1/4] drm/i915: Create stolen memory region from local memory
Matthew Auld
matthew.auld at intel.com
Wed Apr 21 10:46:55 UTC 2021
From: CQ Tang <cq.tang at 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.
v3:
- split stolen lmem vs smem ops(Tvrtko)
- add shortcut for stolen region in i915(Tvrtko)
- sanity check dsm base vs bar size(Xinyun)
v4(Tvrtko):
- more cleanup
- add some TODOs
Signed-off-by: CQ Tang <cq.tang at intel.com>
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Xinyun Liu <xinyun.liu at intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 132 ++++++++++++++++++---
drivers/gpu/drm/i915/gem/i915_gem_stolen.h | 3 +-
drivers/gpu/drm/i915/i915_drv.h | 7 ++
drivers/gpu/drm/i915/i915_pci.c | 2 +-
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_memory_region.c | 13 +-
drivers/gpu/drm/i915/intel_memory_region.h | 5 +-
7 files changed, 140 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index b0597de206de..13a7932cfe1a 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 stolen lmem, we don't need to check if the address range
+ * overlaps with the non-stolen system memory range, since lmem is local
+ * to the gpu.
+ */
+ 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
@@ -374,8 +383,9 @@ static void icl_get_stolen_reserved(struct drm_i915_private *i915,
}
}
-static int i915_gem_init_stolen(struct drm_i915_private *i915)
+static int i915_gem_init_stolen(struct intel_memory_region *mem)
{
+ struct drm_i915_private *i915 = mem->i915;
struct intel_uncore *uncore = &i915->uncore;
resource_size_t reserved_base, stolen_top;
resource_size_t reserved_total, reserved_size;
@@ -396,10 +406,10 @@ static int i915_gem_init_stolen(struct drm_i915_private *i915)
return 0;
}
- if (resource_size(&intel_graphics_stolen_res) == 0)
+ if (resource_size(&mem->region) == 0)
return 0;
- i915->dsm = intel_graphics_stolen_res;
+ i915->dsm = mem->region;
if (i915_adjust_stolen(i915, &i915->dsm))
return 0;
@@ -688,39 +698,123 @@ 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->mm.stolen_region,
size, I915_BO_ALLOC_CONTIGUOUS);
}
-static int init_stolen(struct intel_memory_region *mem)
+static int init_stolen_smem(struct intel_memory_region *mem)
{
- intel_memory_region_set_name(mem, "stolen");
-
/*
* Initialise stolen early so that we may reserve preallocated
* objects for the BIOS to KMS transition.
*/
- return i915_gem_init_stolen(mem->i915);
+ return i915_gem_init_stolen(mem);
}
-static void release_stolen(struct intel_memory_region *mem)
+static void release_stolen_smem(struct intel_memory_region *mem)
{
i915_gem_cleanup_stolen(mem->i915);
}
-static const struct intel_memory_region_ops i915_region_stolen_ops = {
- .init = init_stolen,
- .release = release_stolen,
+static const struct intel_memory_region_ops i915_region_stolen_smem_ops = {
+ .init = init_stolen_smem,
+ .release = release_stolen_smem,
.init_object = _i915_gem_object_stolen_init,
};
-struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915)
+static int init_stolen_lmem(struct intel_memory_region *mem)
+{
+ int err;
+
+ if (GEM_WARN_ON(resource_size(&mem->region) == 0))
+ return -ENODEV;
+
+ if (!io_mapping_init_wc(&mem->iomap,
+ mem->io_start,
+ resource_size(&mem->region)))
+ return -EIO;
+
+ /*
+ * TODO: For stolen lmem we mostly just care about populating the dsm
+ * related bits and setting up the drm_mm allocator for the range.
+ * Perhaps split up i915_gem_init_stolen() for this.
+ */
+ err = i915_gem_init_stolen(mem);
+ if (err)
+ goto err_fini;
+
+ return 0;
+
+err_fini:
+ io_mapping_fini(&mem->iomap);
+ return err;
+}
+
+static void release_stolen_lmem(struct intel_memory_region *mem)
{
- return intel_memory_region_create(i915,
- intel_graphics_stolen_res.start,
- resource_size(&intel_graphics_stolen_res),
- PAGE_SIZE, 0,
- &i915_region_stolen_ops);
+ io_mapping_fini(&mem->iomap);
+ i915_gem_cleanup_stolen(mem->i915);
+}
+
+static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = {
+ .init = init_stolen_lmem,
+ .release = release_stolen_lmem,
+ .init_object = _i915_gem_object_stolen_init,
+};
+
+struct intel_memory_region *
+i915_gem_stolen_lmem_setup(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;
+
+ lmem_base = intel_uncore_read64(uncore, GEN12_DSMBASE);
+ if (GEM_WARN_ON(lmem_base >= pci_resource_len(pdev, 2)))
+ return ERR_PTR(-ENODEV);
+
+ 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_lmem_ops);
+ if (IS_ERR(mem))
+ return mem;
+
+ /*
+ * TODO: consider creating common helper to just print all the
+ * interesting stuff from intel_memory_region, which we can use for all
+ * our probed regions.
+ */
+
+ drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n",
+ &mem->io_start);
+
+ intel_memory_region_set_name(mem, "stolen-local");
+
+ return mem;
+}
+
+struct intel_memory_region*
+i915_gem_stolen_smem_setup(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_smem_ops);
+ if (IS_ERR(mem))
+ return mem;
+
+ intel_memory_region_set_name(mem, "stolen-system");
+
+ return mem;
}
struct drm_i915_gem_object *
@@ -728,7 +822,7 @@ 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->mm.stolen_region;
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..2bec6c367b9c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
@@ -21,7 +21,8 @@ int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
u64 end);
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_gem_stolen_smem_setup(struct drm_i915_private *i915);
+struct intel_memory_region *i915_gem_stolen_lmem_setup(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_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e20294e9227a..0b44333eb703 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -514,6 +514,13 @@ struct intel_l3_parity {
};
struct i915_gem_mm {
+ /*
+ * Shortcut for the stolen region. This points to either
+ * INTEL_REGION_STOLEN_SMEM for integrated platforms, or
+ * INTEL_REGION_STOLEN_LMEM for discrete, or NULL if the device doesn't
+ * support stolen.
+ */
+ struct intel_memory_region *stolen_region;
/** Memory allocator for GTT stolen memory */
struct drm_mm stolen;
/** Protects the usage of the GTT stolen memory allocator. This is
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 7786217638ed..c678e0663d80 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -908,7 +908,7 @@ static const struct intel_device_info rkl_info = {
};
#define DGFX_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 f80d656331f4..ea20058bc13f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12191,6 +12191,7 @@ 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..481a487faca6 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 *
@@ -278,8 +282,15 @@ 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:
+ mem = i915_gem_stolen_lmem_setup(i915);
+ if (!IS_ERR(mem))
+ i915->mm.stolen_region = mem;
+ break;
case INTEL_MEMORY_STOLEN_SYSTEM:
- mem = i915_gem_stolen_setup(i915);
+ mem = i915_gem_stolen_smem_setup(i915);
+ if (!IS_ERR(mem))
+ i915->mm.stolen_region = mem;
break;
default:
continue;
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;
--
2.26.3
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