[Intel-gfx] [PATCH v7 1/4] drm/i915: preparation for using PAT index

fei.yang
2023-05-09T16:58:59Z

From: Fei Yang <fei.yang@intel.com>

This patch is a preparation for replacing enum i915_cache_level with PAT
index. Caching policy for buffer objects is set through the PAT index in
PTE, the old i915_cache_level is not sufficient to represent all caching
modes supported by the hardware.

Preparing the transition by adding some platform dependent data structures
and helper functions to translate the cache_level to pat_index.

cachelevel_to_pat: a platform dependent array mapping cache_level to
pat_index.

max_pat_index: the maximum PAT index recommended in hardware specification
Needed for validating the PAT index passed in from user
space.

i915_gem_get_pat_index: function to convert cache_level to PAT index.

obj_to_i915(obj): macro moved to header file for wider usage.

I915_MAX_CACHE_LEVEL: upper bound of i915_cache_level for the
convenience of coding.

Cc: Chris Wilson <chris.p.wilson@linux.intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Fei Yang <fei.yang@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_object.c | 9 +++
drivers/gpu/drm/i915/gem/i915_gem_object.h | 4 +
.../gpu/drm/i915/gem/i915_gem_object_types.h | 7 ++
drivers/gpu/drm/i915/gem/i915_gem_shrinker.c | 2 -
drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 6 ++
drivers/gpu/drm/i915/gt/intel_ggtt.c | 6 ++
drivers/gpu/drm/i915/i915_pci.c | 79 ++++++++++++++++---
drivers/gpu/drm/i915/intel_device_info.h | 5 ++
.../gpu/drm/i915/selftests/mock_gem_device.c | 9 +++
9 files changed, 116 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index 4666bb82f312..8c70a0ec7d2f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -45,6 +45,15 @@ static struct kmem_cache *slab_objects;

static const struct drm_gem_object_funcs i915_gem_object_funcs;

+unsigned int i915_gem_get_pat_index(struct drm_i915_private *i915,
+ enum i915_cache_level level)
+{
+ if (drm_WARN_ON(&i915->drm, level >= I915_MAX_CACHE_LEVEL))
+ return 0;
+
+ return INTEL_INFO(i915)->cachelevel_to_pat[level];
+}
+
struct drm_i915_gem_object *i915_gem_object_alloc(void)
{
struct drm_i915_gem_object *obj;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index bc1291887d4f..284e1aa396cd 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -20,6 +20,8 @@

enum intel_region_id;

+#define obj_to_i915(obj__) to_i915((obj__)->base.dev)
+
static inline bool i915_gem_object_size_2big(u64 size)
{
struct drm_i915_gem_object *obj;
@@ -30,6 +32,8 @@ static inline bool i915_gem_object_size_2big(u64 size)
return false;
}

+unsigned int i915_gem_get_pat_index(struct drm_i915_private *i915,
+ enum i915_cache_level level);
void i915_gem_init__objects(struct drm_i915_private *i915);

void i915_objects_module_exit(void);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 830c11431ee8..bf0bd8e11355 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -194,6 +194,13 @@ enum i915_cache_level {
* engine.
*/
I915_CACHE_WT,
+ /**
+ * @I915_MAX_CACHE_LEVEL:
+ *
+ * Mark the last entry in the enum. Used for defining cachelevel_to_pat
+ * array for cache_level to pat translation table.
+ */
+ I915_MAX_CACHE_LEVEL,
};

enum i915_map_type {
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
index b1672e054b21..214763942aa2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
@@ -460,8 +460,6 @@ void i915_gem_shrinker_taints_mutex(struct drm_i915_private *i915,
fs_reclaim_release(GFP_KERNEL);
}

-#define obj_to_i915(obj__) to_i915((obj__)->base.dev)
-
/**
* i915_gem_object_make_unshrinkable - Hide the object from the shrinker. By
* default all object types that support shrinking(see IS_SHRINKABLE), will also
diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index 22ec1566d2a7..bb6998d67133 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -78,6 +78,12 @@ static u64 mtl_pte_encode(dma_addr_t addr,
case I915_CACHE_WT:
pte |= GEN12_PPGTT_PTE_PAT0;
break;
+ default:
+ /* This should never happen. Added to deal with the compile
+ * error due to the addition of I915_MAX_CACHE_LEVEL. Will
+ * be removed by the pat_index patch.
+ */
+ break;
}

return pte;
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index 20915edc8bd9..c8390d03fce2 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -242,6 +242,12 @@ static u64 mtl_ggtt_pte_encode(dma_addr_t addr,
case I915_CACHE_WT:
pte |= MTL_GGTT_PTE_PAT0;
break;
+ default:
+ /* This should never happen. Added to deal with the compile
+ * error due to the addition of I915_MAX_CACHE_LEVEL. Will
+ * be removed by the pat_index patch.
+ */
+ break;
}

return pte;
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index c509ea4aa70f..72dd7b9f6dfd 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -30,6 +30,7 @@
#include "display/intel_display_driver.h"
#include "gt/intel_gt_regs.h"
#include "gt/intel_sa_media.h"
+#include "gem/i915_gem_object_types.h"

#include "i915_driver.h"
#include "i915_drv.h"
@@ -164,6 +165,38 @@
.gamma_lut_tests = DRM_COLOR_LUT_NON_DECREASING, \
}

+#define LEGACY_CACHELEVEL \
+ .cachelevel_to_pat = { \
+ [I915_CACHE_NONE] = 0, \
+ [I915_CACHE_LLC] = 1, \
+ [I915_CACHE_L3_LLC] = 2, \
+ [I915_CACHE_WT] = 3, \
+ }
+
+#define TGL_CACHELEVEL \
+ .cachelevel_to_pat = { \
+ [I915_CACHE_NONE] = 3, \
+ [I915_CACHE_LLC] = 0, \
+ [I915_CACHE_L3_LLC] = 0, \
+ [I915_CACHE_WT] = 2, \
+ }
+
+#define PVC_CACHELEVEL \
+ .cachelevel_to_pat = { \
+ [I915_CACHE_NONE] = 0, \
+ [I915_CACHE_LLC] = 3, \
+ [I915_CACHE_L3_LLC] = 3, \
+ [I915_CACHE_WT] = 2, \
+ }
+
+#define MTL_CACHELEVEL \
+ .cachelevel_to_pat = { \
+ [I915_CACHE_NONE] = 2, \
+ [I915_CACHE_LLC] = 3, \
+ [I915_CACHE_L3_LLC] = 3, \
+ [I915_CACHE_WT] = 1, \
+ }
+
/* Keep in gen based order, and chronological order within a gen */

#define GEN_DEFAULT_PAGE_SIZES \
@@ -189,11 +222,13 @@
.has_snoop = true, \
.has_coherent_ggtt = false, \
.dma_mask_size = 32, \
+ .max_pat_index = 3, \
I9XX_PIPE_OFFSETS, \
I9XX_CURSOR_OFFSETS, \
I9XX_COLORS, \
GEN_DEFAULT_PAGE_SIZES, \
- GEN_DEFAULT_REGIONS
+ GEN_DEFAULT_REGIONS, \
+ LEGACY_CACHELEVEL

#define I845_FEATURES \
GEN(2), \
@@ -210,11 +245,13 @@
.has_snoop = true, \
.has_coherent_ggtt = false, \
.dma_mask_size = 32, \
+ .max_pat_index = 3, \
I845_PIPE_OFFSETS, \
I845_CURSOR_OFFSETS, \
I845_COLORS, \
GEN_DEFAULT_PAGE_SIZES, \
- GEN_DEFAULT_REGIONS
+ GEN_DEFAULT_REGIONS, \
+ LEGACY_CACHELEVEL

static const struct intel_device_info i830_info = {
I830_FEATURES,
@@ -249,11 +286,13 @@ static const struct intel_device_info i865g_info = {
.has_snoop = true, \
.has_coherent_ggtt = true, \
.dma_mask_size = 32, \
+ .max_pat_index = 3, \
I9XX_PIPE_OFFSETS, \
I9XX_CURSOR_OFFSETS, \
I9XX_COLORS, \
GEN_DEFAULT_PAGE_SIZES, \
- GEN_DEFAULT_REGIONS
+ GEN_DEFAULT_REGIONS, \
+ LEGACY_CACHELEVEL

static const struct intel_device_info i915g_info = {
GEN3_FEATURES,
@@ -341,11 +380,13 @@ static const struct intel_device_info pnv_m_info = {
.has_snoop = true, \
.has_coherent_ggtt = true, \
.dma_mask_size = 36, \
+ .max_pat_index = 3, \
I9XX_PIPE_OFFSETS, \
I9XX_CURSOR_OFFSETS, \
I9XX_COLORS, \
GEN_DEFAULT_PAGE_SIZES, \
- GEN_DEFAULT_REGIONS
+ GEN_DEFAULT_REGIONS, \
+ LEGACY_CACHELEVEL

static const struct intel_device_info i965g_info = {
GEN4_FEATURES,
@@ -395,11 +436,13 @@ static const struct intel_device_info gm45_info = {
/* ilk does support rc6, but we do not implement [power] contexts */ \
.has_rc6 = 0, \
.dma_mask_size = 36, \
+ .max_pat_index = 3, \
I9XX_PIPE_OFFSETS, \
I9XX_CURSOR_OFFSETS, \
ILK_COLORS, \
GEN_DEFAULT_PAGE_SIZES, \
- GEN_DEFAULT_REGIONS
+ GEN_DEFAULT_REGIONS, \
+ LEGACY_CACHELEVEL

static const struct intel_device_info ilk_d_info = {
GEN5_FEATURES,
@@ -429,13 +472,15 @@ static const struct intel_device_info ilk_m_info = {
.has_rc6p = 0, \
.has_rps = true, \
.dma_mask_size = 40, \
+ .max_pat_index = 3, \
.__runtime.ppgtt_type = INTEL_PPGTT_ALIASING, \
.__runtime.ppgtt_size = 31, \
I9XX_PIPE_OFFSETS, \
I9XX_CURSOR_OFFSETS, \
ILK_COLORS, \
GEN_DEFAULT_PAGE_SIZES, \
- GEN_DEFAULT_REGIONS
+ GEN_DEFAULT_REGIONS, \
+ LEGACY_CACHELEVEL

#define SNB_D_PLATFORM \
GEN6_FEATURES, \
@@ -482,13 +527,15 @@ static const struct intel_device_info snb_m_gt2_info = {
.has_reset_engine = true, \
.has_rps = true, \
.dma_mask_size = 40, \
+ .max_pat_index = 3, \
.__runtime.ppgtt_type = INTEL_PPGTT_ALIASING, \
.__runtime.ppgtt_size = 31, \
IVB_PIPE_OFFSETS, \
IVB_CURSOR_OFFSETS, \
IVB_COLORS, \
GEN_DEFAULT_PAGE_SIZES, \
- GEN_DEFAULT_REGIONS
+ GEN_DEFAULT_REGIONS, \
+ LEGACY_CACHELEVEL

#define IVB_D_PLATFORM \
GEN7_FEATURES, \
@@ -542,6 +589,7 @@ static const struct intel_device_info vlv_info = {
.display.has_gmch = 1,
.display.has_hotplug = 1,
.dma_mask_size = 40,
+ .max_pat_index = 3,
.__runtime.ppgtt_type = INTEL_PPGTT_ALIASING,
.__runtime.ppgtt_size = 31,
.has_snoop = true,
@@ -553,6 +601,7 @@ static const struct intel_device_info vlv_info = {
I9XX_COLORS,
GEN_DEFAULT_PAGE_SIZES,
GEN_DEFAULT_REGIONS,
+ LEGACY_CACHELEVEL,
};

#define G75_FEATURES \
@@ -640,6 +689,7 @@ static const struct intel_device_info chv_info = {
.has_logical_ring_contexts = 1,
.display.has_gmch = 1,
.dma_mask_size = 39,
+ .max_pat_index = 3,
.__runtime.ppgtt_type = INTEL_PPGTT_FULL,
.__runtime.ppgtt_size = 32,
.has_reset_engine = 1,
@@ -651,6 +701,7 @@ static const struct intel_device_info chv_info = {
CHV_COLORS,
GEN_DEFAULT_PAGE_SIZES,
GEN_DEFAULT_REGIONS,
+ LEGACY_CACHELEVEL,
};

#define GEN9_DEFAULT_PAGE_SIZES \
@@ -732,11 +783,13 @@ static const struct intel_device_info skl_gt4_info = {
.has_snoop = true, \
.has_coherent_ggtt = false, \
.display.has_ipc = 1, \
+ .max_pat_index = 3, \
HSW_PIPE_OFFSETS, \
IVB_CURSOR_OFFSETS, \
IVB_COLORS, \
GEN9_DEFAULT_PAGE_SIZES, \
- GEN_DEFAULT_REGIONS
+ GEN_DEFAULT_REGIONS, \
+ LEGACY_CACHELEVEL

static const struct intel_device_info bxt_info = {
GEN9_LP_FEATURES,
@@ -890,9 +943,11 @@ static const struct intel_device_info jsl_info = {
[TRANSCODER_DSI_1] = TRANSCODER_DSI1_OFFSET, \
}, \
TGL_CURSOR_OFFSETS, \
+ TGL_CACHELEVEL, \
.has_global_mocs = 1, \
.has_pxp = 1, \
- .display.has_dsb = 1
+ .display.has_dsb = 1, \
+ .max_pat_index = 3

static const struct intel_device_info tgl_info = {
GEN12_FEATURES,
@@ -1014,6 +1069,7 @@ static const struct intel_device_info adl_p_info = {
.__runtime.graphics.ip.ver = 12, \
.__runtime.graphics.ip.rel = 50, \
XE_HP_PAGE_SIZES, \
+ TGL_CACHELEVEL, \
.dma_mask_size = 46, \
.has_3d_pipeline = 1, \
.has_64bit_reloc = 1, \
@@ -1032,6 +1088,7 @@ static const struct intel_device_info adl_p_info = {
.has_reset_engine = 1, \
.has_rps = 1, \
.has_runtime_pm = 1, \
+ .max_pat_index = 3, \
.__runtime.ppgtt_size = 48, \
.__runtime.ppgtt_type = INTEL_PPGTT_FULL

@@ -1108,11 +1165,13 @@ static const struct intel_device_info pvc_info = {
PLATFORM(INTEL_PONTEVECCHIO),
NO_DISPLAY,
.has_flat_ccs = 0,
+ .max_pat_index = 7,
.__runtime.platform_engine_mask =
BIT(BCS0) |
BIT(VCS0) |
BIT(CCS0) | BIT(CCS1) | BIT(CCS2) | BIT(CCS3),
.require_force_probe = 1,
+ PVC_CACHELEVEL,
};

#define XE_LPDP_FEATURES \
@@ -1152,9 +1211,11 @@ static const struct intel_device_info mtl_info = {
.has_llc = 0,
.has_mslice_steering = 0,
.has_snoop = 1,
+ .max_pat_index = 4,
.__runtime.memory_regions = REGION_SMEM | REGION_STOLEN_LMEM,
.__runtime.platform_engine_mask = BIT(RCS0) | BIT(BCS0) | BIT(CCS0),
.require_force_probe = 1,
+ MTL_CACHELEVEL,
};

#undef PLATFORM
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index f032f2500f50..959a4080840c 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -35,6 +35,8 @@
#include "gt/intel_context_types.h"
#include "gt/intel_sseu.h"

+#include "gem/i915_gem_object_types.h"
+
struct drm_printer;
struct drm_i915_private;
struct intel_gt_definition;
@@ -308,6 +310,9 @@ struct intel_device_info {
* Initial runtime info. Do not access outside of i915_driver_create().
*/
const struct intel_runtime_info __runtime;
+
+ u32 cachelevel_to_pat[I915_MAX_CACHE_LEVEL];
+ u32 max_pat_index;
};

struct intel_driver_caps {
diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index f6a7c0bd2955..0eda8b4ee17f 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -123,7 +123,9 @@ struct drm_i915_private *mock_gem_device(void)
static struct dev_iommu fake_iommu = { .priv = (void *)-1 };
#endif
struct drm_i915_private *i915;
+ struct intel_device_info *i915_info;
struct pci_dev *pdev;
+ unsigned int i;
int ret;

pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
@@ -180,6 +182,13 @@ struct drm_i915_private *mock_gem_device(void)
I915_GTT_PAGE_SIZE_2M;

RUNTIME_INFO(i915)->memory_regions = REGION_SMEM;
+
+ /* simply use legacy cache level for mock device */
+ i915_info = (struct intel_device_info *)INTEL_INFO(i915);
+ i915_info->max_pat_index = 3;
+ for (i = 0; i < I915_MAX_CACHE_LEVEL; i++)
+ i915_info->cachelevel_to_pat[i] = i;
+
intel_memory_regions_hw_probe(i915);

spin_lock_init(&i915->gpu_error.lock);
--
2.25.1