On 7/10/2021 11:15 AM, Michal Wajdeczko wrote:
On 10.07.2021 03:20, Vinay Belgaumkar wrote:
Cache rp0, rp1 and rpn platform limits into slpc structure
for range checking while setting min/max frequencies.
Also add "soft" limits which keep track of frequency changes
made from userland. These are initially set to platform min
and max.
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 41 +++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
index d32274cd1db7..6e978f27b7a6 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
@@ -86,6 +86,9 @@ static int slpc_shared_data_init(struct intel_guc_slpc *slpc)
return err;
}
+ slpc->max_freq_softlimit = 0;
+ slpc->min_freq_softlimit = 0;
as mentioned earlier, now it is time to introduce these fields in .h
done.
+
return err;
}
@@ -384,6 +387,29 @@ void intel_guc_pm_intrmsk_enable(struct intel_gt *gt)
GEN6_PMINTRMSK, pm_intrmsk_mbz, 0);
}
+static int intel_guc_slpc_set_softlimits(struct intel_guc_slpc *slpc)
+{
+ int ret = 0;
+
+ /* Softlimits are initially equivalent to platform limits
+ * unless they have deviated from defaults, in which case,
+ * we retain the values and set min/max accordingly.
+ */
+ if (!slpc->max_freq_softlimit)
+ slpc->max_freq_softlimit = slpc->rp0_freq;
+ else if (slpc->max_freq_softlimit != slpc->rp0_freq)
+ ret = intel_guc_slpc_set_max_freq(slpc,
+ slpc->max_freq_softlimit);
+
+ if (!slpc->min_freq_softlimit)
+ slpc->min_freq_softlimit = slpc->min_freq;
+ else if (slpc->min_freq_softlimit != slpc->min_freq)
+ ret = intel_guc_slpc_set_min_freq(slpc,
+ slpc->min_freq_softlimit);
+
+ return ret;
+}
+
/*
* intel_guc_slpc_enable() - Start SLPC
* @slpc: pointer to intel_guc_slpc.
@@ -402,6 +428,7 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc)
struct drm_i915_private *i915 = slpc_to_i915(slpc);
struct slpc_shared_data *data;
int ret;
+ u32 rp_state_cap;
move up to keep "ret" last
Done.
GEM_BUG_ON(!slpc->vma);
@@ -445,6 +472,20 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc)
DIV_ROUND_CLOSEST(data->task_state_data.max_unslice_freq *
GT_FREQUENCY_MULTIPLIER, GEN9_FREQ_SCALER));
+ rp_state_cap = intel_uncore_read(i915->gt.uncore, GEN6_RP_STATE_CAP);
+
+ slpc->rp0_freq = ((rp_state_cap >> 0) & 0xff) * GT_FREQUENCY_MULTIPLIER;
+ slpc->min_freq = ((rp_state_cap >> 16) & 0xff) * GT_FREQUENCY_MULTIPLIER;
+ slpc->rp1_freq = ((rp_state_cap >> 8) & 0xff) * GT_FREQUENCY_MULTIPLIER;
we should have definitions for these bits and then we should be able to
use REG_FIELD_GET
done.
+
+ if (intel_guc_slpc_set_softlimits(slpc))
+ drm_err(&i915->drm, "Unable to set softlimits");
missing \n
maybe we can also print error ?
done.
+
+ drm_info(&i915->drm,
+ "Platform fused frequency values - min: %u Mhz, max: %u Mhz",
missing \n
double space before 'min'
done.
Thanks,
Vinay.
Michal
+ slpc->min_freq,
+ slpc->rp0_freq);
+
return 0;
}
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