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drm/amdgpu/smu: add metrics table lock for vega20 (v2) 

commit 1c455101c6 upstream.

To protect access to the metrics table.

v2: unlock on error

Bug: https://gitlab.freedesktop.org/drm/amd/issues/900
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Alex Deucher 2019-12-17 09:51:40 -05:00 committed by Greg Kroah-Hartman
parent 86164784cf
commit f72e33675f
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/powerplay/vega20_ppt.c
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@ -1691,17 +1691,20 @@ static int vega20_get_metrics_table(struct smu_context *smu,
struct smu_table_context *smu_table= &smu->smu_table;
int ret = 0;
mutex_lock(&smu->metrics_lock);
if (!smu_table->metrics_time || time_after(jiffies, smu_table->metrics_time + HZ / 1000)) {
ret = smu_update_table(smu, SMU_TABLE_SMU_METRICS, 0,
(void *)smu_table->metrics_table, false);
if (ret) {
pr_info("Failed to export SMU metrics table!\n");
mutex_unlock(&smu->metrics_lock);
return ret;
}
smu_table->metrics_time = jiffies;
}
memcpy(metrics_table, smu_table->metrics_table, sizeof(SmuMetrics_t));
mutex_unlock(&smu->metrics_lock);
return ret;
}