wifi: iwlwifi: mvm: implement PHC clock adjustments
Bugzilla: https://bugzilla.redhat.com/2196821 commit a2f49f7d52a9e7d0dce8f090541a28192b7abd59 Author: Avraham Stern <avraham.stern@intel.com> Date: Mon Mar 20 12:33:07 2023 +0200 wifi: iwlwifi: mvm: implement PHC clock adjustments Implement the following PHC operations: 1. adjtime - for adding an offset to the PHC clock time. 2. adjfine - for adjusting the PHC clock frequency. 3. gettime64 - for getting the PHC clock time. This function returns the time as adjusted by adjtime and adjfine. The adjusted time will also be used for time sync frames timestamping. Signed-off-by: Avraham Stern <avraham.stern@intel.com> Signed-off-by: Gregory Greenman <gregory.greenman@intel.com> Link: https://lore.kernel.org/r/20230320122330.f59750deeee4.I110a7e3ac3c6d39d9dbe1fe77001e3f5bc3814eb@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
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Íñigo Huguet
parent
d73807c1fb
commit
e323e308ac
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@ -778,10 +778,26 @@ struct iwl_mvm_dqa_txq_info {
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struct ptp_data {
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struct ptp_clock *ptp_clock;
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struct ptp_clock_info ptp_clock_info;
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/* keeps track of GP2 wrap-around */
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u32 last_gp2;
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u32 wrap_counter;
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struct delayed_work dwork;
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/* The last GP2 reading from the hw */
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u32 last_gp2;
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/* number of wraparounds since scale_update_adj_time_ns */
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u32 wrap_counter;
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/* GP2 time when the scale was last updated */
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u32 scale_update_gp2;
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/* Adjusted time when the scale was last updated in nanoseconds */
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u64 scale_update_adj_time_ns;
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/* clock frequency offset, scaled to 65536000000 */
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u64 scaled_freq;
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/* Delta between hardware clock and ptp clock in nanoseconds */
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s64 delta;
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};
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struct iwl_time_sync_data {
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@ -2148,6 +2164,7 @@ void iwl_mvm_event_frame_timeout_callback(struct iwl_mvm *mvm,
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void iwl_mvm_ptp_init(struct iwl_mvm *mvm);
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void iwl_mvm_ptp_remove(struct iwl_mvm *mvm);
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u64 iwl_mvm_ptp_get_adj_time(struct iwl_mvm *mvm, u64 base_time);
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int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm, int prof_a, int prof_b);
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int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm);
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int iwl_mvm_ppag_send_cmd(struct iwl_mvm *mvm);
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@ -6,12 +6,31 @@
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#include "mvm.h"
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#include "iwl-debug.h"
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#include <linux/timekeeping.h>
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#include <linux/math64.h>
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#define IWL_PTP_GP2_WRAP 0x100000000ULL
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#define IWL_PTP_WRAP_TIME (3600 * HZ)
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/* The scaled_ppm parameter is ppm (parts per million) with a 16-bit fractional
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* part, which means that a value of 1 in one of those fields actually means
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* 2^-16 ppm, and 2^16=65536 is 1 ppm.
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*/
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#define SCALE_FACTOR 65536000000ULL
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#define IWL_PTP_WRAP_THRESHOLD_USEC (5000)
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static void iwl_mvm_ptp_update_new_read(struct iwl_mvm *mvm, u32 gp2)
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{
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/* If the difference is above the threshold, assume it's a wraparound.
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* Otherwise assume it's an old read and ignore it.
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*/
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if (gp2 < mvm->ptp_data.last_gp2 &&
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mvm->ptp_data.last_gp2 - gp2 < IWL_PTP_WRAP_THRESHOLD_USEC) {
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IWL_DEBUG_INFO(mvm,
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"PTP: ignore old read (gp2=%u, last_gp2=%u)\n",
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gp2, mvm->ptp_data.last_gp2);
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return;
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}
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if (gp2 < mvm->ptp_data.last_gp2) {
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mvm->ptp_data.wrap_counter++;
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IWL_DEBUG_INFO(mvm,
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@ -23,6 +42,45 @@ static void iwl_mvm_ptp_update_new_read(struct iwl_mvm *mvm, u32 gp2)
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schedule_delayed_work(&mvm->ptp_data.dwork, IWL_PTP_WRAP_TIME);
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}
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u64 iwl_mvm_ptp_get_adj_time(struct iwl_mvm *mvm, u64 base_time_ns)
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{
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struct ptp_data *data = &mvm->ptp_data;
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u64 last_gp2_ns = mvm->ptp_data.scale_update_gp2 * NSEC_PER_USEC;
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u64 res;
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u64 diff;
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iwl_mvm_ptp_update_new_read(mvm,
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div64_u64(base_time_ns, NSEC_PER_USEC));
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IWL_DEBUG_INFO(mvm, "base_time_ns=%llu, wrap_counter=%u\n",
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(unsigned long long)base_time_ns, data->wrap_counter);
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base_time_ns = base_time_ns +
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(data->wrap_counter * IWL_PTP_GP2_WRAP * NSEC_PER_USEC);
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/* It is possible that a GP2 timestamp was received from fw before the
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* last scale update. Since we don't know how to scale - ignore it.
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*/
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if (base_time_ns < last_gp2_ns) {
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IWL_DEBUG_INFO(mvm, "Time before scale update - ignore\n");
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return 0;
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}
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diff = base_time_ns - last_gp2_ns;
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IWL_DEBUG_INFO(mvm, "diff ns=%llu\n", (unsigned long long)diff);
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diff = mul_u64_u64_div_u64(diff, data->scaled_freq,
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SCALE_FACTOR);
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IWL_DEBUG_INFO(mvm, "scaled diff ns=%llu\n", (unsigned long long)diff);
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res = data->scale_update_adj_time_ns + data->delta + diff;
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IWL_DEBUG_INFO(mvm, "base=%llu delta=%lld adj=%llu\n",
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(unsigned long long)base_time_ns, (long long)data->delta,
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(unsigned long long)res);
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return res;
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}
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static int
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iwl_mvm_get_crosstimestamp_fw(struct iwl_mvm *mvm, u32 *gp2, u64 *sys_time)
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{
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@ -96,10 +154,7 @@ iwl_mvm_phc_get_crosstimestamp(struct ptp_clock_info *ptp,
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&sys_time);
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}
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iwl_mvm_ptp_update_new_read(mvm, gp2);
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gp2_ns = (gp2 + (mvm->ptp_data.wrap_counter * IWL_PTP_GP2_WRAP)) *
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NSEC_PER_USEC;
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gp2_ns = iwl_mvm_ptp_get_adj_time(mvm, (u64)gp2 * NSEC_PER_USEC);
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IWL_INFO(mvm, "Got Sync Time: GP2:%u, last_GP2: %u, GP2_ns: %lld, sys_time: %lld\n",
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gp2, mvm->ptp_data.last_gp2, gp2_ns, (s64)sys_time);
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@ -125,6 +180,66 @@ static void iwl_mvm_ptp_work(struct work_struct *wk)
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mutex_unlock(&mvm->mutex);
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}
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static int iwl_mvm_ptp_gettime(struct ptp_clock_info *ptp,
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struct timespec64 *ts)
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{
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struct iwl_mvm *mvm = container_of(ptp, struct iwl_mvm,
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ptp_data.ptp_clock_info);
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u64 gp2;
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u64 ns;
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mutex_lock(&mvm->mutex);
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gp2 = iwl_mvm_get_systime(mvm);
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ns = iwl_mvm_ptp_get_adj_time(mvm, gp2 * NSEC_PER_USEC);
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mutex_unlock(&mvm->mutex);
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*ts = ns_to_timespec64(ns);
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return 0;
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}
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static int iwl_mvm_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
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{
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struct iwl_mvm *mvm = container_of(ptp, struct iwl_mvm,
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ptp_data.ptp_clock_info);
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struct ptp_data *data = container_of(ptp, struct ptp_data,
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ptp_clock_info);
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mutex_lock(&mvm->mutex);
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data->delta += delta;
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IWL_DEBUG_INFO(mvm, "delta=%lld, new delta=%lld\n", (long long)delta,
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(long long)data->delta);
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mutex_unlock(&mvm->mutex);
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return 0;
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}
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static int iwl_mvm_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
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{
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struct iwl_mvm *mvm = container_of(ptp, struct iwl_mvm,
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ptp_data.ptp_clock_info);
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struct ptp_data *data = &mvm->ptp_data;
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u32 gp2;
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mutex_lock(&mvm->mutex);
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/* Must call _iwl_mvm_ptp_get_adj_time() before updating
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* data->scale_update_gp2 or data->scaled_freq since
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* scale_update_adj_time_ns should reflect the previous scaled_freq.
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*/
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gp2 = iwl_mvm_get_systime(mvm);
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data->scale_update_adj_time_ns =
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iwl_mvm_ptp_get_adj_time(mvm, gp2 * NSEC_PER_USEC);
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data->scale_update_gp2 = gp2;
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data->wrap_counter = 0;
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data->delta = 0;
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data->scaled_freq = SCALE_FACTOR + scaled_ppm;
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IWL_DEBUG_INFO(mvm, "adjfine: scaled_ppm=%ld new=%llu\n",
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scaled_ppm, (unsigned long long)data->scaled_freq);
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mutex_unlock(&mvm->mutex);
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return 0;
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}
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/* iwl_mvm_ptp_init - initialize PTP for devices which support it.
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* @mvm: internal mvm structure, see &struct iwl_mvm.
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*
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@ -140,6 +255,10 @@ void iwl_mvm_ptp_init(struct iwl_mvm *mvm)
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mvm->ptp_data.ptp_clock_info.max_adj = 0x7fffffff;
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mvm->ptp_data.ptp_clock_info.getcrosststamp =
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iwl_mvm_phc_get_crosstimestamp;
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mvm->ptp_data.ptp_clock_info.adjfine = iwl_mvm_ptp_adjfine;
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mvm->ptp_data.ptp_clock_info.adjtime = iwl_mvm_ptp_adjtime;
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mvm->ptp_data.ptp_clock_info.gettime64 = iwl_mvm_ptp_gettime;
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mvm->ptp_data.scaled_freq = SCALE_FACTOR;
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/* Give a short 'friendly name' to identify the PHC clock */
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snprintf(mvm->ptp_data.ptp_clock_info.name,
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@ -66,19 +66,22 @@ void iwl_mvm_time_sync_msmt_event(struct iwl_mvm *mvm,
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struct sk_buff *skb =
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iwl_mvm_time_sync_find_skb(mvm, notif->peer_addr,
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le32_to_cpu(notif->dialog_token));
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u64 adj_time;
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if (!skb) {
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IWL_DEBUG_INFO(mvm, "Time sync event but no pending skb\n");
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return;
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}
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ts_10ns = iwl_mvm_get_64_bit(notif->t3_hi, notif->t3_lo);
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rx_status = IEEE80211_SKB_RXCB(skb);
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rx_status->ack_tx_hwtstamp = ktime_set(0, ts_10ns * 10);
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ts_10ns = iwl_mvm_get_64_bit(notif->t2_hi, notif->t2_lo);
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adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
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shwt = skb_hwtstamps(skb);
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shwt->hwtstamp = ktime_set(0, ts_10ns * 10);
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shwt->hwtstamp = ktime_set(0, adj_time);
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ts_10ns = iwl_mvm_get_64_bit(notif->t3_hi, notif->t3_lo);
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adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
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rx_status = IEEE80211_SKB_RXCB(skb);
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rx_status->ack_tx_hwtstamp = ktime_set(0, adj_time);
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IWL_DEBUG_INFO(mvm,
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"Time sync: RX event - report frame t2=%llu t3=%llu\n",
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@ -94,7 +97,7 @@ void iwl_mvm_time_sync_msmt_confirm_event(struct iwl_mvm *mvm,
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struct iwl_time_msmt_cfm_notify *notif = (void *)pkt->data;
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struct ieee80211_tx_status status = {};
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struct skb_shared_hwtstamps *shwt;
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u64 ts_10ns;
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u64 ts_10ns, adj_time;
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status.skb =
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iwl_mvm_time_sync_find_skb(mvm, notif->peer_addr,
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@ -105,14 +108,15 @@ void iwl_mvm_time_sync_msmt_confirm_event(struct iwl_mvm *mvm,
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return;
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}
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status.info = IEEE80211_SKB_CB(status.skb);
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ts_10ns = iwl_mvm_get_64_bit(notif->t1_hi, notif->t1_lo);
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adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
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shwt = skb_hwtstamps(status.skb);
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shwt->hwtstamp = ktime_set(0, adj_time);
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ts_10ns = iwl_mvm_get_64_bit(notif->t4_hi, notif->t4_lo);
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status.ack_hwtstamp = ktime_set(0, ts_10ns * 10);
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ts_10ns = iwl_mvm_get_64_bit(notif->t1_hi, notif->t1_lo);
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shwt = skb_hwtstamps(status.skb);
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shwt->hwtstamp = ktime_set(0, ts_10ns * 10);
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adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
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status.info = IEEE80211_SKB_CB(status.skb);
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status.ack_hwtstamp = ktime_set(0, adj_time);
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IWL_DEBUG_INFO(mvm,
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"Time sync: TX event - report frame t1=%llu t4=%llu\n",
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