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)
Signed-off-by: Vinay Belgaumkar vinay.belgaumkar@intel.com --- drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 97 +++++++++++++++++++ .../gpu/drm/i915/gt/uc/intel_guc_slpc_types.h | 11 +++ drivers/gpu/drm/i915/i915_reg.h | 3 + 3 files changed, 111 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 c79dba60b2e6..a98cbf274862 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c @@ -94,6 +94,9 @@ static int slpc_shared_data_init(struct intel_guc_slpc *slpc) return err; }
+ slpc->max_freq_softlimit = 0; + slpc->min_freq_softlimit = 0; + return err; }
@@ -124,6 +127,18 @@ 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[] = { + INTEL_GUC_ACTION_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); @@ -170,6 +185,16 @@ static int slpc_set_param(struct intel_guc_slpc *slpc, u8 id, u32 value) return guc_action_slpc_set_param(guc, id, value); }
+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) { const char *str = NULL; @@ -406,6 +431,55 @@ 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; +} + +static void intel_guc_slpc_ignore_eff_freq(struct intel_guc_slpc *slpc, bool ignore) +{ + if (ignore) { + /* A failure here does not affect the algorithm in a fatal way */ + 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 intel_guc_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); +} + /* * intel_guc_slpc_enable() - Start SLPC * @slpc: pointer to intel_guc_slpc. @@ -423,6 +497,7 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc) { struct drm_i915_private *i915 = slpc_to_i915(slpc); struct slpc_shared_data *data; + u32 rp_state_cap; int ret;
GEM_BUG_ON(!slpc->vma); @@ -460,6 +535,28 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc) slpc_decode_min_freq(slpc), slpc_decode_max_freq(slpc));
+ rp_state_cap = intel_uncore_read(i915->gt.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; + + /* Ignore efficient freq and set min/max to platform min/max */ + intel_guc_slpc_ignore_eff_freq(slpc, true); + intel_guc_slpc_use_fused_rp0(slpc); + + ret = intel_guc_slpc_set_softlimits(slpc); + if (ret) + drm_err(&i915->drm, "Failed to set SLPC softlimits (%pe)\n", + ERR_PTR(ret)); + + drm_info(&i915->drm, + "Platform fused frequency values - min: %u Mhz, max: %u Mhz\n", + slpc->min_freq, + slpc->rp0_freq);
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 f14f81821a51..16dec703db43 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 @@ -6,11 +6,22 @@ #ifndef _INTEL_GUC_SLPC_TYPES_H_ #define _INTEL_GUC_SLPC_TYPES_H_
+#include <linux/types.h> + #define SLPC_RESET_TIMEOUT_MS 5
struct intel_guc_slpc { struct i915_vma *vma; struct slpc_shared_data *vaddr; + + /* 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)