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)
v4: factorize query item writting (Tvrtko)
tweak uapi struct/define names (Tvrtko)
v5: Replace ALIGN() macro (Chris)
v6: Updated uapi comments (Tvrtko)
Moved flags != 0 checks into vfuncs (Tvrtko)
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_query.c | 105
++++++++++++++++++++++++++++++++++++++
include/uapi/drm/i915_drm.h | 68 ++++++++++++++++++++++++
2 files changed, 173 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_query.c
b/drivers/gpu/drm/i915/i915_query.c
index 5aa886313cf9..5d1386db8e7b 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -25,8 +25,113 @@
#include "i915_drv.h"
#include <uapi/drm/i915_drm.h>
+static int copy_query_data(struct drm_i915_query_item *query_item,
+ const void *item_ptr, u32 item_length,
+ const void *data_ptr, u32 data_length)
+{
+ u32 total_length = item_length + data_length;
+
+ BUG_ON(add_overflows(item_length, data_length));
+
+ if (query_item->length == 0)
+ return total_length;
+
+ if (query_item->length < total_length)
+ return -EINVAL;
+
+ if (copy_to_user(u64_to_user_ptr(query_item->data_ptr),
+ item_ptr, item_length))
+ return -EFAULT;
+
+ if (copy_to_user(u64_to_user_ptr(query_item->data_ptr +
item_length),
+ data_ptr, data_length))
+ return -EFAULT;
+
