ice: Use PSM clock frequency to calculate RL profiles

The core clock frequency is currently hardcoded at 446 MHz for the RL
profile calculations. This causes issues since not all devices use that
clock frequency. Read the GLGEN_CLKSTAT_SRC register to determine which PSM
clock frequency is selected.  This ensures that the rate limiter profile
calculations will be correct.
Signed-off-by: Ben Shelton <benjamin.h.shelton@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_common.c

@@ -907,6 +907,7 @@ enum ice_status ice_init_hw(struct ice_hw *hw)
 		ice_debug(hw, ICE_DBG_SCHED, "Failed to get scheduler allocated resources\n");
 		goto err_unroll_alloc;
 	}
+	ice_sched_get_psm_clk_freq(hw);
 
 	/* Initialize port_info struct with scheduler data */
 	status = ice_sched_init_port(hw->port_info);

drivers/net/ethernet/intel/ice/ice_hw_autogen.h

@@ -86,6 +86,9 @@
 #define QRXFLXP_CNTXT_RXDID_PRIO_S		8
 #define QRXFLXP_CNTXT_RXDID_PRIO_M		ICE_M(0x7, 8)
 #define QRXFLXP_CNTXT_TS_M			BIT(11)
+#define GLGEN_CLKSTAT_SRC_PSM_CLK_SRC_S		4
+#define GLGEN_CLKSTAT_SRC_PSM_CLK_SRC_M		ICE_M(0x3, 4)
+#define GLGEN_CLKSTAT_SRC			0x000B826C
 #define GLGEN_RSTAT				0x000B8188
 #define GLGEN_RSTAT_DEVSTATE_M			ICE_M(0x3, 0)
 #define GLGEN_RSTCTL				0x000B8180

drivers/net/ethernet/intel/ice/ice_sched.c

@@ -1281,6 +1281,46 @@ enum ice_status ice_sched_query_res_alloc(struct ice_hw *hw)
 	return status;
 }
 
+/**
+ * ice_sched_get_psm_clk_freq - determine the PSM clock frequency
+ * @hw: pointer to the HW struct
+ *
+ * Determine the PSM clock frequency and store in HW struct
+ */
+void ice_sched_get_psm_clk_freq(struct ice_hw *hw)
+{
+	u32 val, clk_src;
+
+	val = rd32(hw, GLGEN_CLKSTAT_SRC);
+	clk_src = (val & GLGEN_CLKSTAT_SRC_PSM_CLK_SRC_M) >>
+		GLGEN_CLKSTAT_SRC_PSM_CLK_SRC_S;
+
+#define PSM_CLK_SRC_367_MHZ 0x0
+#define PSM_CLK_SRC_416_MHZ 0x1
+#define PSM_CLK_SRC_446_MHZ 0x2
+#define PSM_CLK_SRC_390_MHZ 0x3
+
+	switch (clk_src) {
+	case PSM_CLK_SRC_367_MHZ:
+		hw->psm_clk_freq = ICE_PSM_CLK_367MHZ_IN_HZ;
+		break;
+	case PSM_CLK_SRC_416_MHZ:
+		hw->psm_clk_freq = ICE_PSM_CLK_416MHZ_IN_HZ;
+		break;
+	case PSM_CLK_SRC_446_MHZ:
+		hw->psm_clk_freq = ICE_PSM_CLK_446MHZ_IN_HZ;
+		break;
+	case PSM_CLK_SRC_390_MHZ:
+		hw->psm_clk_freq = ICE_PSM_CLK_390MHZ_IN_HZ;
+		break;
+	default:
+		ice_debug(hw, ICE_DBG_SCHED, "PSM clk_src unexpected %u\n",
+			  clk_src);
+		/* fall back to a safe default */
+		hw->psm_clk_freq = ICE_PSM_CLK_446MHZ_IN_HZ;
+	}
+}
+
 /**
  * ice_sched_find_node_in_subtree - Find node in part of base node subtree
  * @hw: pointer to the HW struct
@@ -2856,11 +2896,12 @@ static void ice_set_clear_shared_bw(struct ice_bw_type_info *bw_t_info, u32 bw)
 
 /**
  * ice_sched_calc_wakeup - calculate RL profile wakeup parameter
+ * @hw: pointer to the HW struct
  * @bw: bandwidth in Kbps
  *
  * This function calculates the wakeup parameter of RL profile.
  */
-static u16 ice_sched_calc_wakeup(s32 bw)
+static u16 ice_sched_calc_wakeup(struct ice_hw *hw, s32 bw)
 {
 	s64 bytes_per_sec, wakeup_int, wakeup_a, wakeup_b, wakeup_f;
 	s32 wakeup_f_int;
@@ -2868,7 +2909,7 @@ static u16 ice_sched_calc_wakeup(s32 bw)
 
 	/* Get the wakeup integer value */
 	bytes_per_sec = div64_long(((s64)bw * 1000), BITS_PER_BYTE);
-	wakeup_int = div64_long(ICE_RL_PROF_FREQUENCY, bytes_per_sec);
+	wakeup_int = div64_long(hw->psm_clk_freq, bytes_per_sec);
 	if (wakeup_int > 63) {
 		wakeup = (u16)((1 << 15) | wakeup_int);
 	} else {
@@ -2877,8 +2918,7 @@ static u16 ice_sched_calc_wakeup(s32 bw)
 		 */
 		wakeup_b = (s64)ICE_RL_PROF_MULTIPLIER * wakeup_int;
 		wakeup_a = div64_long((s64)ICE_RL_PROF_MULTIPLIER *
-					   ICE_RL_PROF_FREQUENCY,
-				      bytes_per_sec);
+					   hw->psm_clk_freq, bytes_per_sec);
 
 		/* Get Fraction value */
 		wakeup_f = wakeup_a - wakeup_b;
@@ -2898,13 +2938,15 @@ static u16 ice_sched_calc_wakeup(s32 bw)
 
 /**
  * ice_sched_bw_to_rl_profile - convert BW to profile parameters
+ * @hw: pointer to the HW struct
  * @bw: bandwidth in Kbps
  * @profile: profile parameters to return
  *
  * This function converts the BW to profile structure format.
  */
 static enum ice_status
-ice_sched_bw_to_rl_profile(u32 bw, struct ice_aqc_rl_profile_elem *profile)
+ice_sched_bw_to_rl_profile(struct ice_hw *hw, u32 bw,
+			   struct ice_aqc_rl_profile_elem *profile)
 {
 	enum ice_status status = ICE_ERR_PARAM;
 	s64 bytes_per_sec, ts_rate, mv_tmp;
@@ -2924,7 +2966,7 @@ ice_sched_bw_to_rl_profile(u32 bw, struct ice_aqc_rl_profile_elem *profile)
 	for (i = 0; i < 64; i++) {
 		u64 pow_result = BIT_ULL(i);
 
-		ts_rate = div64_long((s64)ICE_RL_PROF_FREQUENCY,
+		ts_rate = div64_long((s64)hw->psm_clk_freq,
 				     pow_result * ICE_RL_PROF_TS_MULTIPLIER);
 		if (ts_rate <= 0)
 			continue;
@@ -2948,7 +2990,7 @@ ice_sched_bw_to_rl_profile(u32 bw, struct ice_aqc_rl_profile_elem *profile)
 	if (found) {
 		u16 wm;
 
-		wm = ice_sched_calc_wakeup(bw);
+		wm = ice_sched_calc_wakeup(hw, bw);
 		profile->rl_multiply = cpu_to_le16(mv);
 		profile->wake_up_calc = cpu_to_le16(wm);
 		profile->rl_encode = cpu_to_le16(encode);
@@ -3017,7 +3059,7 @@ ice_sched_add_rl_profile(struct ice_port_info *pi,
 	if (!rl_prof_elem)
 		return NULL;
 
-	status = ice_sched_bw_to_rl_profile(bw, &rl_prof_elem->profile);
+	status = ice_sched_bw_to_rl_profile(hw, bw, &rl_prof_elem->profile);
 	if (status)
 		goto exit_add_rl_prof;
 

drivers/net/ethernet/intel/ice/ice_sched.h

@@ -24,12 +24,16 @@
 	((BIT(11) - 1) * 64) /* In Bytes */
 #define ICE_MAX_BURST_SIZE_KBYTE_GRANULARITY	ICE_MAX_BURST_SIZE_ALLOWED
 
-#define ICE_RL_PROF_FREQUENCY 446000000
 #define ICE_RL_PROF_ACCURACY_BYTES 128
 #define ICE_RL_PROF_MULTIPLIER 10000
 #define ICE_RL_PROF_TS_MULTIPLIER 32
 #define ICE_RL_PROF_FRACTION 512
 
+#define ICE_PSM_CLK_367MHZ_IN_HZ 367647059
+#define ICE_PSM_CLK_416MHZ_IN_HZ 416666667
+#define ICE_PSM_CLK_446MHZ_IN_HZ 446428571
+#define ICE_PSM_CLK_390MHZ_IN_HZ 390625000
+
 /* BW rate limit profile parameters list entry along
  * with bandwidth maintained per layer in port info
  */
@@ -65,6 +69,8 @@ ice_aq_query_sched_elems(struct ice_hw *hw, u16 elems_req,
 			 u16 *elems_ret, struct ice_sq_cd *cd);
 enum ice_status ice_sched_init_port(struct ice_port_info *pi);
 enum ice_status ice_sched_query_res_alloc(struct ice_hw *hw);
+void ice_sched_get_psm_clk_freq(struct ice_hw *hw);
+
 void ice_sched_clear_port(struct ice_port_info *pi);
 void ice_sched_cleanup_all(struct ice_hw *hw);
 void ice_sched_clear_agg(struct ice_hw *hw);

drivers/net/ethernet/intel/ice/ice_type.h

@@ -618,6 +618,8 @@ struct ice_hw {
 	void *back;
 	struct ice_aqc_layer_props *layer_info;
 	struct ice_port_info *port_info;
+	/* PSM clock frequency for calculating RL profile params */
+	u32 psm_clk_freq;
 	u64 debug_mask;		/* bitmap for debug mask */
 	enum ice_mac_type mac_type;