From 7616f334e6d441aa9824221b1352ebec9de57ad7 Mon Sep 17 00:00:00 2001 From: Eliad Peller Date: Thu, 20 Nov 2014 17:33:43 +0200 Subject: [PATCH] iwlwifi: pcie: add basic reference accounting Implement the ref/unref trans ops and track both tx and host command queues (and hold references while they are not empty). Signed-off-by: Eliad Peller Reviewed-by: Johannes Berg Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/iwl-drv.c | 5 +++ drivers/net/wireless/iwlwifi/iwl-modparams.h | 2 + drivers/net/wireless/iwlwifi/pcie/internal.h | 8 ++++ drivers/net/wireless/iwlwifi/pcie/trans.c | 39 ++++++++++++++++++++ drivers/net/wireless/iwlwifi/pcie/tx.c | 34 ++++++++++++++--- 5 files changed, 83 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-drv.c b/drivers/net/wireless/iwlwifi/iwl-drv.c index afa63f7b2d3e..0381dc495b1c 100644 --- a/drivers/net/wireless/iwlwifi/iwl-drv.c +++ b/drivers/net/wireless/iwlwifi/iwl-drv.c @@ -1362,6 +1362,7 @@ struct iwl_mod_params iwlwifi_mod_params = { .bt_coex_active = true, .power_level = IWL_POWER_INDEX_1, .wd_disable = true, + .d0i3_disable = true, #ifndef CONFIG_IWLWIFI_UAPSD .uapsd_disable = true, #endif /* CONFIG_IWLWIFI_UAPSD */ @@ -1478,6 +1479,10 @@ MODULE_PARM_DESC(wd_disable, module_param_named(nvm_file, iwlwifi_mod_params.nvm_file, charp, S_IRUGO); MODULE_PARM_DESC(nvm_file, "NVM file name"); +module_param_named(d0i3_disable, iwlwifi_mod_params.d0i3_disable, + bool, S_IRUGO); +MODULE_PARM_DESC(d0i3_disable, "disable d0i3 functionality (default: Y)"); + module_param_named(uapsd_disable, iwlwifi_mod_params.uapsd_disable, bool, S_IRUGO); #ifdef CONFIG_IWLWIFI_UAPSD diff --git a/drivers/net/wireless/iwlwifi/iwl-modparams.h b/drivers/net/wireless/iwlwifi/iwl-modparams.h index 71507cf490e6..2a8cf4b2445c 100644 --- a/drivers/net/wireless/iwlwifi/iwl-modparams.h +++ b/drivers/net/wireless/iwlwifi/iwl-modparams.h @@ -103,6 +103,7 @@ enum iwl_disable_11n { * @power_level: power level, default = 1 * @debug_level: levels are IWL_DL_* * @ant_coupling: antenna coupling in dB, default = 0 + * @d0i3_disable: disable d0i3, default = 1, * @fw_monitor: allow to use firmware monitor */ struct iwl_mod_params { @@ -121,6 +122,7 @@ struct iwl_mod_params { int ant_coupling; char *nvm_file; bool uapsd_disable; + bool d0i3_disable; bool fw_monitor; }; diff --git a/drivers/net/wireless/iwlwifi/pcie/internal.h b/drivers/net/wireless/iwlwifi/pcie/internal.h index 1aea6b66c594..e5652d82d79e 100644 --- a/drivers/net/wireless/iwlwifi/pcie/internal.h +++ b/drivers/net/wireless/iwlwifi/pcie/internal.h @@ -318,6 +318,11 @@ struct iwl_trans_pcie { /*protect hw register */ spinlock_t reg_lock; bool cmd_in_flight; + bool ref_cmd_in_flight; + + /* protect ref counter */ + spinlock_t ref_lock; + u32 ref_count; dma_addr_t fw_mon_phys; struct page *fw_mon_page; @@ -381,6 +386,9 @@ void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn, struct sk_buff_head *skbs); void iwl_trans_pcie_tx_reset(struct iwl_trans *trans); +void iwl_trans_pcie_ref(struct iwl_trans *trans); +void iwl_trans_pcie_unref(struct iwl_trans *trans); + static inline u16 iwl_pcie_tfd_tb_get_len(struct iwl_tfd *tfd, u8 idx) { struct iwl_tfd_tb *tb = &tfd->tbs[idx]; diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c index 4b42de3b0674..fbdbec89ad70 100644 --- a/drivers/net/wireless/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/iwlwifi/pcie/trans.c @@ -931,6 +931,7 @@ static int iwl_pcie_load_given_ucode_8000b(struct iwl_trans *trans, static int iwl_trans_pcie_start_fw(struct iwl_trans *trans, const struct fw_img *fw, bool run_in_rfkill) { + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); int ret; bool hw_rfkill; @@ -960,6 +961,9 @@ static int iwl_trans_pcie_start_fw(struct iwl_trans *trans, return ret; } + /* init ref_count to 1 (should be cleared when ucode is loaded) */ + trans_pcie->ref_count = 1; + /* make sure rfkill handshake bits are cleared */ iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL); iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, @@ -1550,6 +1554,38 @@ static void iwl_trans_pcie_set_bits_mask(struct iwl_trans *trans, u32 reg, spin_unlock_irqrestore(&trans_pcie->reg_lock, flags); } +void iwl_trans_pcie_ref(struct iwl_trans *trans) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + unsigned long flags; + + if (iwlwifi_mod_params.d0i3_disable) + return; + + spin_lock_irqsave(&trans_pcie->ref_lock, flags); + IWL_DEBUG_RPM(trans, "ref_counter: %d\n", trans_pcie->ref_count); + trans_pcie->ref_count++; + spin_unlock_irqrestore(&trans_pcie->ref_lock, flags); +} + +void iwl_trans_pcie_unref(struct iwl_trans *trans) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + unsigned long flags; + + if (iwlwifi_mod_params.d0i3_disable) + return; + + spin_lock_irqsave(&trans_pcie->ref_lock, flags); + IWL_DEBUG_RPM(trans, "ref_counter: %d\n", trans_pcie->ref_count); + if (WARN_ON_ONCE(trans_pcie->ref_count == 0)) { + spin_unlock_irqrestore(&trans_pcie->ref_lock, flags); + return; + } + trans_pcie->ref_count--; + spin_unlock_irqrestore(&trans_pcie->ref_lock, flags); +} + static const char *get_csr_string(int cmd) { #define IWL_CMD(x) case x: return #x @@ -2274,6 +2310,9 @@ static const struct iwl_trans_ops trans_ops_pcie = { .release_nic_access = iwl_trans_pcie_release_nic_access, .set_bits_mask = iwl_trans_pcie_set_bits_mask, + .ref = iwl_trans_pcie_ref, + .unref = iwl_trans_pcie_unref, + .dump_data = iwl_trans_pcie_dump_data, }; diff --git a/drivers/net/wireless/iwlwifi/pcie/tx.c b/drivers/net/wireless/iwlwifi/pcie/tx.c index 8a6c7a084aa1..c1c4c75026b2 100644 --- a/drivers/net/wireless/iwlwifi/pcie/tx.c +++ b/drivers/net/wireless/iwlwifi/pcie/tx.c @@ -985,17 +985,31 @@ void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn, if (iwl_queue_space(&txq->q) > txq->q.low_mark) iwl_wake_queue(trans, txq); + + if (q->read_ptr == q->write_ptr) { + IWL_DEBUG_RPM(trans, "Q %d - last tx reclaimed\n", q->id); + iwl_trans_pcie_unref(trans); + } + out: spin_unlock_bh(&txq->lock); } -static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans) +static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans, + const struct iwl_host_cmd *cmd) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); int ret; lockdep_assert_held(&trans_pcie->reg_lock); + if (!(cmd->flags & CMD_SEND_IN_IDLE) && + !trans_pcie->ref_cmd_in_flight) { + trans_pcie->ref_cmd_in_flight = true; + IWL_DEBUG_RPM(trans, "set ref_cmd_in_flight - ref\n"); + iwl_trans_pcie_ref(trans); + } + if (trans_pcie->cmd_in_flight) return 0; @@ -1036,6 +1050,12 @@ static int iwl_pcie_clear_cmd_in_flight(struct iwl_trans *trans) lockdep_assert_held(&trans_pcie->reg_lock); + if (trans_pcie->ref_cmd_in_flight) { + trans_pcie->ref_cmd_in_flight = false; + IWL_DEBUG_RPM(trans, "clear ref_cmd_in_flight - unref\n"); + iwl_trans_pcie_unref(trans); + } + if (WARN_ON(!trans_pcie->cmd_in_flight)) return 0; @@ -1473,7 +1493,7 @@ static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans, mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout); spin_lock_irqsave(&trans_pcie->reg_lock, flags); - ret = iwl_pcie_set_cmd_in_flight(trans); + ret = iwl_pcie_set_cmd_in_flight(trans, cmd); if (ret < 0) { idx = ret; spin_unlock_irqrestore(&trans_pcie->reg_lock, flags); @@ -1819,9 +1839,13 @@ int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb, wait_write_ptr = ieee80211_has_morefrags(fc); /* start timer if queue currently empty */ - if (txq->need_update && q->read_ptr == q->write_ptr && - trans_pcie->wd_timeout) - mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout); + if (q->read_ptr == q->write_ptr) { + if (txq->need_update && trans_pcie->wd_timeout) + mod_timer(&txq->stuck_timer, + jiffies + trans_pcie->wd_timeout); + IWL_DEBUG_RPM(trans, "Q: %d first tx - take ref\n", q->id); + iwl_trans_pcie_ref(trans); + } /* Tell device the write index *just past* this latest filled TFD */ q->write_ptr = iwl_queue_inc_wrap(q->write_ptr); -- 2.39.5