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.
v2: Address review comments (Michal W)
v3: Formatting (Michal W)
v4: Add separate function to parse rp values (Michal W)
v5: Perform range checking for set min/max (Michal W)
v6: checkpatch() and rename static functions (Michal W)
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 114 ++++++++++++++++++
.../gpu/drm/i915/gt/uc/intel_guc_slpc_types.h | 9 ++
drivers/gpu/drm/i915/i915_reg.h | 3 +
3 files changed, 126 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 ebabc84d4e39..c46eb404371e 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
@@ -96,6 +96,9 @@ int intel_guc_slpc_init(struct intel_guc_slpc *slpc)
return err;
}
+ slpc->max_freq_softlimit = 0;
+ slpc->min_freq_softlimit = 0;
+
return err;
}
@@ -126,6 +129,17 @@ static int guc_action_slpc_set_param(struct intel_guc *guc, u8 id, u32 value)
return ret > 0 ? -EPROTO : ret;
}
+static int guc_action_slpc_unset_param(struct intel_guc *guc, u8 id)
+{
+ u32 request[] = {
+ GUC_ACTION_HOST2GUC_PC_SLPC_REQUEST,
+ SLPC_EVENT(SLPC_EVENT_PARAMETER_UNSET, 2),
+ id,
+ };
+
+ return intel_guc_send(guc, request, ARRAY_SIZE(request));
+}
+
static bool slpc_is_running(struct intel_guc_slpc *slpc)
{
return slpc_get_state(slpc) == SLPC_GLOBAL_STATE_RUNNING;
@@ -179,6 +193,16 @@ static int slpc_set_param(struct intel_guc_slpc *slpc, u8 id, u32 value)
return ret;
}
+static int slpc_unset_param(struct intel_guc_slpc *slpc,
+ u8 id)
+{
+ struct intel_guc *guc = slpc_to_guc(slpc);
+
+ GEM_BUG_ON(id >= SLPC_MAX_PARAM);
+
+ return guc_action_slpc_unset_param(guc, id);
+}
+
static const char *slpc_global_state_to_string(enum slpc_global_state state)
{
switch (state) {
@@ -300,6 +324,11 @@ int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val)
intel_wakeref_t wakeref;
int ret;
+ if (val < slpc->min_freq ||
+ val > slpc->rp0_freq ||
+ val < slpc->min_freq_softlimit)
+ return -EINVAL;
+
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
ret = slpc_set_param(slpc,
SLPC_PARAM_GLOBAL_MAX_GT_UNSLICE_FREQ_MHZ,
@@ -310,6 +339,8 @@ int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val)
ret = -EIO;
}
+ slpc->max_freq_softlimit = val;
+
return ret;
}
@@ -356,6 +387,11 @@ int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val)
intel_wakeref_t wakeref;
int ret;
+ if (val < slpc->min_freq ||
+ val > slpc->rp0_freq ||
+ val > slpc->max_freq_softlimit)
+ return -EINVAL;
+
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
ret = slpc_set_param(slpc,
SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
@@ -366,6 +402,8 @@ int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val)
ret = -EIO;
}
+ slpc->min_freq_softlimit = val;
+
return ret;
}
@@ -411,6 +449,71 @@ void intel_guc_pm_intrmsk_enable(struct intel_gt *gt)
GEN6_PMINTRMSK, pm_intrmsk_mbz, 0);
}
+static int 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;
+}
+
+static void slpc_ignore_eff_freq(struct intel_guc_slpc *slpc, bool ignore)
+{
+ /* A failure here does not affect the algorithm in a fatal way */
+ if (ignore) {
+ slpc_set_param(slpc,
+ SLPC_PARAM_IGNORE_EFFICIENT_FREQUENCY,
+ ignore);
+ slpc_set_param(slpc,
+ SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
+ slpc->min_freq);
+ } else {
+ slpc_unset_param(slpc,
+ SLPC_PARAM_IGNORE_EFFICIENT_FREQUENCY);
+ slpc_unset_param(slpc,
+ SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ);
+ }
+}
+
+static void slpc_use_fused_rp0(struct intel_guc_slpc *slpc)
+{
+ /* Force SLPC to used platform rp0 */
+ slpc_set_param(slpc,
+ SLPC_PARAM_GLOBAL_MAX_GT_UNSLICE_FREQ_MHZ,
+ slpc->rp0_freq);
+}
+
+static void slpc_get_rp_values(struct intel_guc_slpc *slpc)
+{
+ u32 rp_state_cap;
+
+ rp_state_cap = intel_uncore_read(slpc_to_gt(slpc)->uncore,
+ GEN6_RP_STATE_CAP);
+
+ slpc->rp0_freq = REG_FIELD_GET(RP0_CAP_MASK, rp_state_cap) *
+ GT_FREQUENCY_MULTIPLIER;
+ slpc->rp1_freq = REG_FIELD_GET(RP1_CAP_MASK, rp_state_cap) *
+ GT_FREQUENCY_MULTIPLIER;
+ slpc->min_freq = REG_FIELD_GET(RPN_CAP_MASK, rp_state_cap) *
+ GT_FREQUENCY_MULTIPLIER;
+}
+
/*
* intel_guc_slpc_enable() - Start SLPC
* @slpc: pointer to intel_guc_slpc.
@@ -446,6 +549,17 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc)
intel_guc_pm_intrmsk_enable(&i915->gt);
+ slpc_get_rp_values(slpc);
+
+ /* Ignore efficient freq and set min/max to platform min/max */
+ slpc_ignore_eff_freq(slpc, true);
+ slpc_use_fused_rp0(slpc);
+
+ ret = slpc_set_softlimits(slpc);
+ if (ret)
+ drm_err(&i915->drm, "Failed to set SLPC softlimits (%pe)\n",
+ ERR_PTR(ret));
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
index 3cefe19b17b2..41d13527666f 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
@@ -15,6 +15,15 @@ struct intel_guc_slpc {
struct slpc_shared_data *vaddr;
bool supported;
bool selected;
+
+ /* platform frequency limits */
+ u32 min_freq;
+ u32 rp0_freq;
+ u32 rp1_freq;
+
+ /* frequency softlimits */
+ u32 min_freq_softlimit;
+ u32 max_freq_softlimit;
};
#endif
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5603377e06ca..f3a445f79a36 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4109,6 +4109,9 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define BXT_GT_PERF_STATUS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x7070)
#define GEN6_RP_STATE_LIMITS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5994)
#define GEN6_RP_STATE_CAP _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5998)
+#define RP0_CAP_MASK REG_GENMASK(7, 0)
+#define RP1_CAP_MASK REG_GENMASK(15, 8)
+#define RPN_CAP_MASK REG_GENMASK(23, 16)
#define BXT_RP_STATE_CAP _MMIO(0x138170)
#define GEN9_RP_STATE_LIMITS _MMIO(0x138148)
--
2.25.0
