drm/i915/selftests: Show the pcode frequency table on error

If we encounter an error while scaling, read back the frequency tables
from the pcu.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200420172739.11620-5-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/selftest_rps.c b/drivers/gpu/drm/i915/gt/selftest_rps.c
index 81d7772763bcfe21cbb9be99d49b98a4a1ee9e4f..3f5b8cf928ccaf37a1ad0a7a8d6783b187bbc76e 100644 (file)
--- a/drivers/gpu/drm/i915/gt/selftest_rps.c
+++ b/drivers/gpu/drm/i915/gt/selftest_rps.c
@@ -292,6 +292,43 @@ int live_rps_control(void *arg)
        return err;
 }
 
+static void show_pcu_config(struct intel_rps *rps)
+{
+       struct drm_i915_private *i915 = rps_to_i915(rps);
+       unsigned int max_gpu_freq, min_gpu_freq;
+       intel_wakeref_t wakeref;
+       int gpu_freq;
+
+       if (!HAS_LLC(i915))
+               return;
+
+       min_gpu_freq = rps->min_freq;
+       max_gpu_freq = rps->max_freq;
+       if (INTEL_GEN(i915) >= 9) {
+               /* Convert GT frequency to 50 HZ units */
+               min_gpu_freq /= GEN9_FREQ_SCALER;
+               max_gpu_freq /= GEN9_FREQ_SCALER;
+       }
+
+       wakeref = intel_runtime_pm_get(rps_to_uncore(rps)->rpm);
+
+       pr_info("%5s  %5s  %5s\n", "GPU", "eCPU", "eRing");
+       for (gpu_freq = min_gpu_freq; gpu_freq <= max_gpu_freq; gpu_freq++) {
+               int ia_freq = gpu_freq;
+
+               sandybridge_pcode_read(i915,
+                                      GEN6_PCODE_READ_MIN_FREQ_TABLE,
+                                      &ia_freq, NULL);
+
+               pr_info("%5d  %5d  %5d\n",
+                       gpu_freq * 50,
+                       ((ia_freq >> 0) & 0xff) * 100,
+                       ((ia_freq >> 8) & 0xff) * 100);
+       }
+
+       intel_runtime_pm_put(rps_to_uncore(rps)->rpm, wakeref);
+}
+
 static u64 __measure_frequency(u32 *cntr, int duration_ms)
 {
        u64 dc, dt;
@@ -444,6 +481,7 @@ int live_rps_frequency_cs(void *arg)
                               engine->name,
                               max.freq * min.count,
                               min.freq * max.count);
+                       show_pcu_config(rps);
                        err = -EINVAL;
                }
 
@@ -552,6 +590,7 @@ int live_rps_frequency_srm(void *arg)
                               engine->name,
                               max.freq * min.count,
                               min.freq * max.count);
+                       show_pcu_config(rps);
                        err = -EINVAL;
                }