intel/perf: restructure i915 perf version checks

Trying to make things more readable.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8525>

src/intel/perf/gen_perf.h

@@ -389,6 +389,26 @@ gen_perf_new(void *ctx)
    return perf;
 }
 
+/** Whether we have the ability to hold off preemption on a batch so we don't
+ * have to look at the OA buffer to subtract unrelated workloads off the
+ * values captured through MI_* commands.
+ */
+static inline bool
+gen_perf_has_hold_preemption(const struct gen_perf_config *perf)
+{
+   return perf->i915_perf_version >= 3;
+}
+
+/** Whether we have the ability to lock EU array power configuration for the
+ * duration of the performance recording. This is useful on Gen11 where the HW
+ * architecture requires half the EU for particular workloads.
+ */
+static inline bool
+gen_perf_has_global_sseu(const struct gen_perf_config *perf)
+{
+   return perf->i915_perf_version >= 4;
+}
+
 uint32_t gen_perf_get_n_passes(struct gen_perf_config *perf,
                                const uint32_t *counter_indices,
                                uint32_t counter_indices_count,

src/intel/perf/gen_perf_query.c

@@ -348,8 +348,6 @@ gen_perf_close(struct gen_perf_context *perfquery,
    }
 }
 
-#define NUM_PERF_PROPERTIES(array) (ARRAY_SIZE(array) / 2)
-
 static bool
 gen_perf_open(struct gen_perf_context *perf_ctx,
               int metrics_set_id,
@@ -358,28 +356,40 @@ gen_perf_open(struct gen_perf_context *perf_ctx,
               int drm_fd,
               uint32_t ctx_id)
 {
-   uint64_t properties[] = {
-      /* Single context sampling */
-      DRM_I915_PERF_PROP_CTX_HANDLE, ctx_id,
+   uint64_t properties[DRM_I915_PERF_PROP_MAX * 2];
+   uint32_t p = 0;
 
-      /* Include OA reports in samples */
-      DRM_I915_PERF_PROP_SAMPLE_OA, true,
+   /* Single context sampling */
+   properties[p++] = DRM_I915_PERF_PROP_CTX_HANDLE;
+   properties[p++] = ctx_id;
 
-      /* OA unit configuration */
-      DRM_I915_PERF_PROP_OA_METRICS_SET, metrics_set_id,
-      DRM_I915_PERF_PROP_OA_FORMAT, report_format,
-      DRM_I915_PERF_PROP_OA_EXPONENT, period_exponent,
+   /* Include OA reports in samples */
+   properties[p++] = DRM_I915_PERF_PROP_SAMPLE_OA;
+   properties[p++] = true;
+
+   /* OA unit configuration */
+   properties[p++] = DRM_I915_PERF_PROP_OA_METRICS_SET;
+   properties[p++] = metrics_set_id;
+
+   properties[p++] = DRM_I915_PERF_PROP_OA_FORMAT;
+   properties[p++] = report_format;
+
+   properties[p++] = DRM_I915_PERF_PROP_OA_EXPONENT;
+   properties[p++] = period_exponent;
+
+   /* SSEU configuration */
+   if (gen_perf_has_global_sseu(perf_ctx->perf)) {
+      properties[p++] = DRM_I915_PERF_PROP_GLOBAL_SSEU;
+      properties[p++] = to_user_pointer(&perf_ctx->perf->sseu);
+   }
+
+   assert(p <= ARRAY_SIZE(properties));
 
-      /* SSEU configuration */
-      DRM_I915_PERF_PROP_GLOBAL_SSEU, to_user_pointer(&perf_ctx->perf->sseu),
-   };
    struct drm_i915_perf_open_param param = {
       .flags = I915_PERF_FLAG_FD_CLOEXEC |
                I915_PERF_FLAG_FD_NONBLOCK |
                I915_PERF_FLAG_DISABLED,
-      .num_properties = perf_ctx->perf->i915_perf_version >= 4 ?
-                        NUM_PERF_PROPERTIES(properties) :
-                        NUM_PERF_PROPERTIES(properties) - 1,
+      .num_properties = p / 2,
       .properties_ptr = (uintptr_t) properties,
    };
    int fd = gen_ioctl(drm_fd, DRM_IOCTL_I915_PERF_OPEN, &param);

src/intel/vulkan/anv_perf.c

@@ -57,7 +57,7 @@ anv_get_perf(const struct gen_device_info *devinfo, int fd)
     * perf revision 2.
     */
    if (!(INTEL_DEBUG & DEBUG_NO_OACONFIG)) {
-      if (perf->i915_perf_version < 3)
+      if (!gen_perf_has_hold_preemption(perf))
          goto err;
    }
 
@@ -106,7 +106,7 @@ anv_device_perf_open(struct anv_device *device, uint64_t metric_id)
     * enabled we would use only half on Gen11 because of functional
     * requirements.
     */
-   if (device->physical->perf->i915_perf_version >= 4) {
+   if (gen_perf_has_global_sseu(device->physical->perf)) {
       properties[p++] = DRM_I915_PERF_PROP_GLOBAL_SSEU;
       properties[p++] = (uintptr_t) &device->physical->perf->sseu;
    }