From: Emmanuel Grumbach emmanuel.grumbach@intel.com
commit ed3e4c6d3cd8f093a3636cb05492429fe2af228d upstream.
Newest devices have a new firmware load mechanism. This mechanism is called the context info. It means that the driver doesn't need to load the sections of the firmware. The driver rather prepares a place in DRAM, with pointers to the relevant sections of the firmware, and the firmware loads itself. At the end of the process, the firmware sends the ALIVE interrupt. This is different from the previous scheme in which the driver expected the FH_TX interrupt after each section being transferred over the DMA.
In order to support this new flow, we enabled all the interrupts. This broke the assumption that we have in the code that the RF-Kill interrupt can't interrupt the firmware load flow.
Change the context info flow to enable only the ALIVE interrupt, and re-enable all the other interrupts only after the firmware is alive. Then, we won't see the RF-Kill interrupt until then. Getting the RF-Kill interrupt while loading the firmware made us kill the firmware while it is loading and we ended up dumping garbage instead of the firmware state.
Re-enable the ALIVE | RX interrupts from the ISR when we get the ALIVE interrupt to be able to get the RX interrupt that comes immediately afterwards for the ALIVE notification. This is needed for non MSI-X only.
Cc: stable@vger.kernel.org Signed-off-by: Emmanuel Grumbach emmanuel.grumbach@intel.com Signed-off-by: Luca Coelho luciano.coelho@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c | 2 - drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c | 2 - drivers/net/wireless/intel/iwlwifi/pcie/internal.h | 27 +++++++++++++++ drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 5 ++ drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c | 9 +++++ 5 files changed, 43 insertions(+), 2 deletions(-)
--- a/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c @@ -168,7 +168,7 @@ int iwl_pcie_ctxt_info_gen3_init(struct
memcpy(iml_img, trans->iml, trans->iml_len);
- iwl_enable_interrupts(trans); + iwl_enable_fw_load_int_ctx_info(trans);
/* kick FW self load */ iwl_write64(trans, CSR_CTXT_INFO_ADDR, --- a/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c @@ -222,7 +222,7 @@ int iwl_pcie_ctxt_info_init(struct iwl_t
trans_pcie->ctxt_info = ctxt_info;
- iwl_enable_interrupts(trans); + iwl_enable_fw_load_int_ctx_info(trans);
/* Configure debug, if exists */ if (iwl_pcie_dbg_on(trans)) --- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h +++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h @@ -894,6 +894,33 @@ static inline void iwl_enable_fw_load_in } }
+static inline void iwl_enable_fw_load_int_ctx_info(struct iwl_trans *trans) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + + IWL_DEBUG_ISR(trans, "Enabling ALIVE interrupt only\n"); + + if (!trans_pcie->msix_enabled) { + /* + * When we'll receive the ALIVE interrupt, the ISR will call + * iwl_enable_fw_load_int_ctx_info again to set the ALIVE + * interrupt (which is not really needed anymore) but also the + * RX interrupt which will allow us to receive the ALIVE + * notification (which is Rx) and continue the flow. + */ + trans_pcie->inta_mask = CSR_INT_BIT_ALIVE | CSR_INT_BIT_FH_RX; + iwl_write32(trans, CSR_INT_MASK, trans_pcie->inta_mask); + } else { + iwl_enable_hw_int_msk_msix(trans, + MSIX_HW_INT_CAUSES_REG_ALIVE); + /* + * Leave all the FH causes enabled to get the ALIVE + * notification. + */ + iwl_enable_fh_int_msk_msix(trans, trans_pcie->fh_init_mask); + } +} + static inline u16 iwl_pcie_get_cmd_index(const struct iwl_txq *q, u32 index) { return index & (q->n_window - 1); --- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c @@ -1850,6 +1850,8 @@ irqreturn_t iwl_pcie_irq_handler(int irq */ iwl_pcie_rxmq_restock(trans, trans_pcie->rxq); } + + handled |= CSR_INT_BIT_ALIVE; }
/* Safely ignore these bits for debug checks below */ @@ -1968,6 +1970,9 @@ irqreturn_t iwl_pcie_irq_handler(int irq /* Re-enable RF_KILL if it occurred */ else if (handled & CSR_INT_BIT_RF_KILL) iwl_enable_rfkill_int(trans); + /* Re-enable the ALIVE / Rx interrupt if it occurred */ + else if (handled & (CSR_INT_BIT_ALIVE | CSR_INT_BIT_FH_RX)) + iwl_enable_fw_load_int_ctx_info(trans); spin_unlock(&trans_pcie->irq_lock);
out: --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c @@ -272,6 +272,15 @@ void iwl_trans_pcie_gen2_fw_alive(struct * paging memory cannot be freed included since FW will still use it */ iwl_pcie_ctxt_info_free(trans); + + /* + * Re-enable all the interrupts, including the RF-Kill one, now that + * the firmware is alive. + */ + iwl_enable_interrupts(trans); + mutex_lock(&trans_pcie->mutex); + iwl_pcie_check_hw_rf_kill(trans); + mutex_unlock(&trans_pcie->mutex); }
int iwl_trans_pcie_gen2_start_fw(struct iwl_trans *trans,