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drm/v3d: Size the kperfmon_ids array at runtime
Instead of statically reserving pessimistic space for the kperfmon_ids array, make the userspace extension code allocate the exactly required amount of space. Apart from saving some memory at runtime, this also removes the need for the V3D_MAX_PERFMONS macro whose removal will benefit further driver cleanup. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com> Reviewed-by: Maíra Canal <mcanal@igalia.com> Signed-off-by: Maíra Canal <mcanal@igalia.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240711135340.84617-8-tursulin@igalia.com
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@ -351,13 +351,9 @@ struct v3d_timestamp_query {
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struct drm_syncobj *syncobj;
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};
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/* Number of perfmons required to handle all supported performance counters */
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#define V3D_MAX_PERFMONS DIV_ROUND_UP(V3D_MAX_COUNTERS, \
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DRM_V3D_MAX_PERF_COUNTERS)
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struct v3d_performance_query {
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/* Performance monitor IDs for this query */
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u32 kperfmon_ids[V3D_MAX_PERFMONS];
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u32 *kperfmon_ids;
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/* Syncobj that indicates the query availability */
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struct drm_syncobj *syncobj;
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@ -94,8 +94,10 @@ v3d_performance_query_info_free(struct v3d_performance_query_info *query_info,
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if (query_info->queries) {
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unsigned int i;
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for (i = 0; i < count; i++)
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for (i = 0; i < count; i++) {
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drm_syncobj_put(query_info->queries[i].syncobj);
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kvfree(query_info->queries[i].kperfmon_ids);
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}
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kvfree(query_info->queries);
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}
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@ -671,10 +671,20 @@ v3d_copy_query_info(struct v3d_performance_query_info *query_info,
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goto error;
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}
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query->kperfmon_ids =
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kvmalloc_array(nperfmons,
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sizeof(struct v3d_performance_query *),
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GFP_KERNEL);
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if (!query->kperfmon_ids) {
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err = -ENOMEM;
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goto error;
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}
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ids_pointer = u64_to_user_ptr(ids);
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for (j = 0; j < nperfmons; j++) {
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if (get_user(id, ids_pointer++)) {
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kvfree(query->kperfmon_ids);
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err = -EFAULT;
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goto error;
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}
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@ -684,6 +694,7 @@ v3d_copy_query_info(struct v3d_performance_query_info *query_info,
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query->syncobj = drm_syncobj_find(file_priv, sync);
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if (!query->syncobj) {
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kvfree(query->kperfmon_ids);
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err = -ENOENT;
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goto error;
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}
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@ -717,9 +728,6 @@ v3d_get_cpu_reset_performance_params(struct drm_file *file_priv,
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if (copy_from_user(&reset, ext, sizeof(reset)))
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return -EFAULT;
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if (reset.nperfmons > V3D_MAX_PERFMONS)
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return -EINVAL;
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job->job_type = V3D_CPU_JOB_TYPE_RESET_PERFORMANCE_QUERY;
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job->performance_query.queries = kvmalloc_array(reset.count,
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@ -767,9 +775,6 @@ v3d_get_cpu_copy_performance_query_params(struct drm_file *file_priv,
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if (copy.pad)
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return -EINVAL;
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if (copy.nperfmons > V3D_MAX_PERFMONS)
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return -EINVAL;
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job->job_type = V3D_CPU_JOB_TYPE_COPY_PERFORMANCE_QUERY;
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job->performance_query.queries = kvmalloc_array(copy.count,
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