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drm/v3d: Size the kperfmon_ids array at runtime

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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
This commit is contained in:
Tvrtko Ursulin
2024-07-11 14:53:36 +01:00
committed by Maíra Canal
parent 4bd75a81e6
commit c9d6630f7c
3 changed files with 15 additions and 12 deletions
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17
drivers/gpu/drm/v3d/v3d_submit.c
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@@ -671,10 +671,20 @@ v3d_copy_query_info(struct v3d_performance_query_info *query_info,
goto error;
}
query->kperfmon_ids =
kvmalloc_array(nperfmons,
sizeof(struct v3d_performance_query *),
GFP_KERNEL);
if (!query->kperfmon_ids) {
err = -ENOMEM;
goto error;
}
ids_pointer = u64_to_user_ptr(ids);
for (j = 0; j < nperfmons; j++) {
if (get_user(id, ids_pointer++)) {
kvfree(query->kperfmon_ids);
err = -EFAULT;
goto error;
}
@@ -684,6 +694,7 @@ v3d_copy_query_info(struct v3d_performance_query_info *query_info,
query->syncobj = drm_syncobj_find(file_priv, sync);
if (!query->syncobj) {
kvfree(query->kperfmon_ids);
err = -ENOENT;
goto error;
}
@@ -717,9 +728,6 @@ v3d_get_cpu_reset_performance_params(struct drm_file *file_priv,
if (copy_from_user(&reset, ext, sizeof(reset)))
return -EFAULT;
if (reset.nperfmons > V3D_MAX_PERFMONS)
return -EINVAL;
job->job_type = V3D_CPU_JOB_TYPE_RESET_PERFORMANCE_QUERY;
job->performance_query.queries = kvmalloc_array(reset.count,
@@ -767,9 +775,6 @@ v3d_get_cpu_copy_performance_query_params(struct drm_file *file_priv,
if (copy.pad)
return -EINVAL;
if (copy.nperfmons > V3D_MAX_PERFMONS)
return -EINVAL;
job->job_type = V3D_CPU_JOB_TYPE_COPY_PERFORMANCE_QUERY;
job->performance_query.queries = kvmalloc_array(copy.count,