With the introduction of asymmetric slices in CNL, we cannot rely on
the previous SUBSLICE_MASK getparam to tell userspace what subslices
are available. Here we introduce a more detailed way of querying the
Gen's GPU topology that doesn't aggregate numbers.
This is essential for monitoring parts of the GPU with the OA unit,
because counters need to be normalized to the number of
EUs/subslices/slices. The current aggregated numbers like EU_TOTAL do
not gives us sufficient information.
As a bonus we can draw representations of the GPU :
https://imgur.com/a/vuqpa
v2: Rename uapi struct s/_mask/_info/ (Tvrtko)
Report max_slice/subslice/eus_per_subslice rather than strides
(Tvrtko)
Add uapi macros to read data from *_info structs (Tvrtko)
v3: Use !!(v & DRM_I915_BIT()) for uapi macros instead of custom
shifts (Tvrtko)
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_query.c | 134
++++++++++++++++++++++++++++++++++++++
include/uapi/drm/i915_drm.h | 53 +++++++++++++++
2 files changed, 187 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_query.c
b/drivers/gpu/drm/i915/i915_query.c
index 5694cfea4553..465ec18a472f 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -25,8 +25,129 @@
#include "i915_drv.h"
#include <uapi/drm/i915_drm.h>
+static int query_slices_info(struct drm_i915_private *dev_priv,
+ struct drm_i915_query_item *query_item)
+{
+ const struct sseu_dev_info *sseu = &INTEL_INFO(dev_priv)->sseu;
+ struct drm_i915_query_slices_info slices_info;
+ u32 data_length, length;
+
+ if (sseu->max_slices == 0)
+ return -ENODEV;
+
+ data_length = sizeof(sseu->slice_mask);
+ length = sizeof(slices_info) + data_length;
+
+ /*
+ * If we ever change the internal slice mask data type, we'll
need to
+ * update this function.
+ */
+ BUILD_BUG_ON(sizeof(u8) != sizeof(sseu->slice_mask));
+
+ if (query_item->length == 0) {
+ query_item->length = length;
+ return 0;
+ }
+
+ if (query_item->length != length)
+ return -EINVAL;
+
+ memset(&slices_info, 0, sizeof(slices_info));
+ slices_info.max_slices = sseu->max_slices;
+
+ if (copy_to_user(u64_to_user_ptr(query_item->data_ptr),
&slices_info,
+ sizeof(slices_info)))
+ return -EFAULT;
+
+ if (copy_to_user(u64_to_user_ptr(query_item->data_ptr +
+ offsetof(struct drm_i915_query_slices_info,
data)),
+ &sseu->slice_mask, data_length))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int query_subslices_info(struct drm_i915_private *dev_priv,
+ struct drm_i915_query_item *query_item)
+{
+ const struct sseu_dev_info *sseu = &INTEL_INFO(dev_priv)->sseu;
+ struct drm_i915_query_subslices_info subslices_info;
+ u32 data_length, length;
+
+ if (sseu->max_slices == 0)
+ return -ENODEV;
+
+ memset(&subslices_info, 0, sizeof(subslices_info));
+ subslices_info.max_slices = sseu->max_slices;
+ subslices_info.max_subslices = sseu->max_subslices;
+
+ data_length = subslices_info.max_slices *
+ DIV_ROUND_UP(subslices_info.max_subslices,
+ sizeof(sseu->subslice_mask[0]) * BITS_PER_BYTE);
+ length = sizeof(subslices_info) + data_length;
+
+ if (query_item->length == 0) {
+ query_item->length = length;
+ return 0;
+ }
+
+ if (query_item->length != length)
+ return -EINVAL;
+
+ if (copy_to_user(u64_to_user_ptr(query_item->data_ptr),
&subslices_info,
+ sizeof(subslices_info)))
+ return -EFAULT;
+
+ if (copy_to_user(u64_to_user_ptr(query_item->data_ptr +
+ offsetof(struct
drm_i915_query_subslices_info, data)),
+ sseu->subslice_mask, data_length))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int query_eus_info(struct drm_i915_private *dev_priv,
+ struct drm_i915_query_item *query_item)
+{
+ const struct sseu_dev_info *sseu = &INTEL_INFO(dev_priv)->sseu;
+ struct drm_i915_query_eus_info eus_info;
+ u32 data_length, length;
+
+ if (sseu->max_slices == 0)
+ return -ENODEV;
+
+ memset(&eus_info, 0, sizeof(eus_info));
+ eus_info.max_slices = sseu->max_slices;
+ eus_info.max_subslices = sseu->max_subslices;
+ eus_info.max_eus_per_subslice = sseu->max_eus_per_subslice;
+
+ data_length = eus_info.max_slices * eus_info.max_subslices *
+ DIV_ROUND_UP(eus_info.max_eus_per_subslice, BITS_PER_BYTE);
+ length = sizeof(eus_info) + data_length;
+
+ if (query_item->length == 0) {
+ query_item->length = length;
+ return 0;
+ }
+
+ if (query_item->length != length)
+ return -EINVAL;
+
+ if (copy_to_user(u64_to_user_ptr(query_item->data_ptr),
&eus_info,
+ sizeof(eus_info)))
+ return -EFAULT;
+
+ if (copy_to_user(u64_to_user_ptr(query_item->data_ptr +
+ offsetof(struct drm_i915_query_eus_info, data)),
+ sseu->eu_mask, data_length))
+ return -EFAULT;
