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iwlwifi: mvm: fix firmware debug restart recording 

When we want to stop the recording of the firmware debug
and restart it later without reloading the firmware we
don't need to resend the configuration that comes with
host commands.
Sending those commands confused the hardware and led to
an NMI 0x66.

Change the flow as following:
* read the relevant registers (DBGC_IN_SAMPLE, DBGC_OUT_CTRL)
* clear those registers
* wait for the hardware to complete its write to the buffer
* get the data
* restore the value of those registers (to restart the
  recording)

For early start (where the configuration is already
compiled in the firmware), we don't need to set those
registers after the firmware has been loaded, but only
when we want to restart the recording without having
restarted the firmware.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Emmanuel Grumbach 2017-03-29 10:21:09 +03:00 committed by Luca Coelho
parent d995440575
commit addce854f1
4 changed files with 28 additions and 20 deletions
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1
drivers/net/wireless/intel/iwlwifi/iwl-prph.h
View File

@ -370,6 +370,7 @@
#define MON_DMARB_RD_DATA_ADDR (0xa03c5c)
#define DBGC_IN_SAMPLE (0xa03c00)
#define DBGC_OUT_CTRL (0xa03c0c)
/* enable the ID buf for read */
#define WFPM_PS_CTL_CLR 0xA0300C

12
drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c
View File

@ -1002,14 +1002,6 @@ int iwl_mvm_fw_dbg_collect_trig(struct iwl_mvm *mvm,
return 0;
}
static inline void iwl_mvm_restart_early_start(struct iwl_mvm *mvm)
{
if (mvm->cfg->device_family == IWL_DEVICE_FAMILY_7000)
iwl_clear_bits_prph(mvm->trans, MON_BUFF_SAMPLE_CTL, 0x100);
else
iwl_write_prph(mvm->trans, DBGC_IN_SAMPLE, 1);
}
int iwl_mvm_start_fw_dbg_conf(struct iwl_mvm *mvm, u8 conf_id)
{
u8 *ptr;
@ -1023,10 +1015,8 @@ int iwl_mvm_start_fw_dbg_conf(struct iwl_mvm *mvm, u8 conf_id)
/* EARLY START - firmware's configuration is hard coded */
if ((!mvm->fw->dbg_conf_tlv[conf_id] ||
!mvm->fw->dbg_conf_tlv[conf_id]->num_of_hcmds) &&
conf_id == FW_DBG_START_FROM_ALIVE) {
iwl_mvm_restart_early_start(mvm);
conf_id == FW_DBG_START_FROM_ALIVE)
return 0;
}
if (!mvm->fw->dbg_conf_tlv[conf_id])
return -EINVAL;

1
drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
View File

@ -1756,6 +1756,7 @@ static inline void iwl_mvm_stop_device(struct iwl_mvm *mvm)
if (!iwl_mvm_has_new_tx_api(mvm))
iwl_free_fw_paging(mvm);
mvm->ucode_loaded = false;
mvm->fw_dbg_conf = FW_DBG_INVALID;
iwl_trans_stop_device(mvm->trans);
}

34
drivers/net/wireless/intel/iwlwifi/mvm/ops.c
View File

@ -1149,22 +1149,38 @@ static void iwl_mvm_fw_error_dump_wk(struct work_struct *work)
mutex_lock(&mvm->mutex);
/* stop recording */
if (mvm->cfg->device_family == IWL_DEVICE_FAMILY_7000) {
/* stop recording */
iwl_set_bits_prph(mvm->trans, MON_BUFF_SAMPLE_CTL, 0x100);
iwl_mvm_fw_error_dump(mvm);
/* start recording again if the firmware is not crashed */
if (!test_bit(STATUS_FW_ERROR, &mvm->trans->status) &&
mvm->fw->dbg_dest_tlv)
iwl_clear_bits_prph(mvm->trans,
MON_BUFF_SAMPLE_CTL, 0x100);
} else {
u32 in_sample = iwl_read_prph(mvm->trans, DBGC_IN_SAMPLE);
u32 out_ctrl = iwl_read_prph(mvm->trans, DBGC_OUT_CTRL);
/* stop recording */
iwl_write_prph(mvm->trans, DBGC_IN_SAMPLE, 0);
/* wait before we collect the data till the DBGC stop */
udelay(100);
iwl_write_prph(mvm->trans, DBGC_OUT_CTRL, 0);
/* wait before we collect the data till the DBGC stop */
udelay(500);
iwl_mvm_fw_error_dump(mvm);
/* start recording again if the firmware is not crashed */
if (!test_bit(STATUS_FW_ERROR, &mvm->trans->status) &&
mvm->fw->dbg_dest_tlv) {
iwl_write_prph(mvm->trans, DBGC_IN_SAMPLE, in_sample);
iwl_write_prph(mvm->trans, DBGC_OUT_CTRL, out_ctrl);
}
}
iwl_mvm_fw_error_dump(mvm);
/* start recording again if the firmware is not crashed */
WARN_ON_ONCE((!test_bit(STATUS_FW_ERROR, &mvm->trans->status)) &&
mvm->fw->dbg_dest_tlv &&
iwl_mvm_start_fw_dbg_conf(mvm, mvm->fw_dbg_conf));
mutex_unlock(&mvm->mutex);
iwl_mvm_unref(mvm, IWL_MVM_REF_FW_DBG_COLLECT);