Extend the query ioctl to allow querying the count of the available L3
Banks on a given engine.
Testcase: igt@i915_query@query-l3-bank-count
Test-with: 20230921220001.3793008-1-jonathan.cavitt@xxxxxxxxx
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@xxxxxxxxx>
---
uAPI change requested by Compute UMD.
Changes to Compute UMD will be posted shortly.
v2:
- Remove extra period.
- Return -EINVAL instead of -ENODEV.
- Add testcase and UMD explanation to comments.
drivers/gpu/drm/i915/gt/intel_gt.c | 26 +++++++++++++++++++
drivers/gpu/drm/i915/gt/intel_gt.h | 3 +++
drivers/gpu/drm/i915/gt/intel_gt_regs.h | 1 +
drivers/gpu/drm/i915/i915_query.c | 34 +++++++++++++++++++++++++
include/uapi/drm/i915_drm.h | 13 ++++++++++
5 files changed, 77 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 449f0b7fc8434..3f29eb3510bac 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -884,6 +884,32 @@ static int intel_gt_tile_setup(struct intel_gt *gt, phys_addr_t phys_addr)
return 0;
}
+int intel_count_l3_banks(struct drm_i915_private *i915,
+ struct intel_engine_cs *engine)
+{
+ struct intel_gt *gt = engine->gt;
+ struct intel_uncore *uncore = gt->uncore;
+ intel_wakeref_t wakeref;
+ u32 count, store;
+
+ /* L3 Banks Counting not supported prior to version 12 */
+ if (GRAPHICS_VER(i915) < 12)
+ return -EINVAL;
+
+ if (IS_PONTEVECCHIO(i915)) {
+ with_intel_runtime_pm(uncore->rpm, wakeref)
+ store = intel_uncore_read(uncore, GEN10_MIRROR_FUSE3);
+ count = hweight32(REG_FIELD_GET(GEN12_MEML3_EN_MASK, store)) * 4 *
+ hweight32(REG_FIELD_GET(XEHPC_GT_L3_MODE_MASK, store));
+ } else if (GRAPHICS_VER_FULL(i915) > IP_VER(12, 50)) {
+ count = hweight32(gt->info.mslice_mask) * 8;
+ } else {
+ count = hweight32(gt->info.l3bank_mask);
+ }
+
+ return count;
+}
+
int intel_gt_probe_all(struct drm_i915_private *i915)
{
struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index 239848bcb2a42..4a05443418efd 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -161,6 +161,9 @@ static inline bool intel_gt_is_wedged(const struct intel_gt *gt)
return unlikely(test_bit(I915_WEDGED, >->reset.flags));
}
+int intel_count_l3_banks(struct drm_i915_private *i915,
+ struct intel_engine_cs *engine);
+
int intel_gt_probe_all(struct drm_i915_private *i915);
int intel_gt_tiles_init(struct drm_i915_private *i915);
void intel_gt_release_all(struct drm_i915_private *i915);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 9f2a7d103ea5d..80925d0237cf4 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -571,6 +571,7 @@
#define GEN10_MIRROR_FUSE3 _MMIO(0x9118)
#define GEN10_L3BANK_PAIR_COUNT 4
#define GEN10_L3BANK_MASK 0x0F
+#define XEHPC_GT_L3_MODE_MASK REG_GENMASK(7, 4)
/* on Xe_HP the same fuses indicates mslices instead of L3 banks */
#define GEN12_MAX_MSLICES 4
#define GEN12_MEML3_EN_MASK 0x0F
diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index 00871ef997920..bd3e68cf1bd10 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -10,6 +10,7 @@
#include "i915_perf.h"
#include "i915_query.h"
#include "gt/intel_engine_user.h"
+#include "gt/intel_gt.h"
#include <uapi/drm/i915_drm.h>
static int copy_query_item(void *query_hdr, size_t query_sz,
@@ -551,6 +552,38 @@ static int query_hwconfig_blob(struct drm_i915_private *i915,
return hwconfig->size;
}
+static int
+query_l3bank_count(struct drm_i915_private *i915,
+ struct drm_i915_query_item *query_item)
+{
+ struct drm_i915_query_memory_regions __user *query_ptr =
+ u64_to_user_ptr(query_item->data_ptr);
+ struct i915_engine_class_instance classinstance;
+ struct intel_engine_cs *engine;
+ int count;
+
+ if (query_item->length == 0)
+ return sizeof(count);
+
+ classinstance = *((struct i915_engine_class_instance *)&query_item->flags);
+
+ engine = intel_engine_lookup_user(i915, (u8)classinstance.engine_class,
+ (u8)classinstance.engine_instance);
+
+ if (!engine)
+ return -EINVAL;
+
+ count = intel_count_l3_banks(i915, engine);
+
+ if (count < 0)
+ return count;
+
+ if (copy_to_user(query_ptr, &count, sizeof(count)))
+ return -EFAULT;
+
+ return sizeof(count);
+}
+
static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv,
struct drm_i915_query_item *query_item) = {
query_topology_info,
@@ -559,6 +592,7 @@ static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv,
query_memregion_info,
query_hwconfig_blob,
query_geometry_subslices,
+ query_l3bank_count,
};
int i915_query_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 7000e5910a1d7..d651e8afe8f1a 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -3013,6 +3013,7 @@ struct drm_i915_query_item {
* - %DRM_I915_QUERY_MEMORY_REGIONS (see struct drm_i915_query_memory_regions)
* - %DRM_I915_QUERY_HWCONFIG_BLOB (see `GuC HWCONFIG blob uAPI`)
* - %DRM_I915_QUERY_GEOMETRY_SUBSLICES (see struct drm_i915_query_topology_info)
+ * - %DRM_I915_QUERY_L3BANK_COUNT (see `L3 Bank Count Query uAPI`)
*/
__u64 query_id;
#define DRM_I915_QUERY_TOPOLOGY_INFO 1
@@ -3021,6 +3022,7 @@ struct drm_i915_query_item {
#define DRM_I915_QUERY_MEMORY_REGIONS 4
#define DRM_I915_QUERY_HWCONFIG_BLOB 5
#define DRM_I915_QUERY_GEOMETRY_SUBSLICES 6
+#define DRM_I915_QUERY_L3BANK_COUNT 7
/* Must be kept compact -- no holes and well documented */
/**
@@ -3690,6 +3692,17 @@ struct drm_i915_gem_create_ext {
__u64 extensions;
};
+/**
+ * DOC: L3 Bank Count Query uAPI
+ *
+ * The L3 bank count query called through the query id
+ * DRM_I915_QUERY_L3BANK_COUNT and returns the count of
+ * the available L3 Banks on a given engine.
+ *
+ * The count itself is an integer, and since no additional
+ * data is returned, the count is returned as such.
+ */
+
/**
* struct drm_i915_gem_create_ext_memory_regions - The
* I915_GEM_CREATE_EXT_MEMORY_REGIONS extension.
--
2.25.1
