diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/pcie/rx.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/pcie/rx.c | 91 |
1 files changed, 57 insertions, 34 deletions
diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c index d1a61ba6247a..17c8e5d82681 100644 --- a/drivers/net/wireless/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/iwlwifi/pcie/rx.c @@ -35,10 +35,6 @@ #include "internal.h" #include "iwl-op-mode.h" -#ifdef CONFIG_IWLWIFI_IDI -#include "iwl-amfh.h" -#endif - /****************************************************************************** * * RX path functions @@ -181,15 +177,15 @@ void iwl_rx_queue_update_write_ptr(struct iwl_trans *trans, } /** - * iwlagn_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr + * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr */ -static inline __le32 iwlagn_dma_addr2rbd_ptr(dma_addr_t dma_addr) +static inline __le32 iwl_dma_addr2rbd_ptr(dma_addr_t dma_addr) { return cpu_to_le32((u32)(dma_addr >> 8)); } /** - * iwlagn_rx_queue_restock - refill RX queue from pre-allocated pool + * iwl_rx_queue_restock - refill RX queue from pre-allocated pool * * If there are slots in the RX queue that need to be restocked, * and we have free pre-allocated buffers, fill the ranks as much @@ -199,7 +195,7 @@ static inline __le32 iwlagn_dma_addr2rbd_ptr(dma_addr_t dma_addr) * also updates the memory address in the firmware to reference the new * target buffer. */ -static void iwlagn_rx_queue_restock(struct iwl_trans *trans) +static void iwl_rx_queue_restock(struct iwl_trans *trans) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); struct iwl_rx_queue *rxq = &trans_pcie->rxq; @@ -207,6 +203,17 @@ static void iwlagn_rx_queue_restock(struct iwl_trans *trans) struct iwl_rx_mem_buffer *rxb; unsigned long flags; + /* + * If the device isn't enabled - not need to try to add buffers... + * This can happen when we stop the device and still have an interrupt + * pending. We stop the APM before we sync the interrupts / tasklets + * because we have to (see comment there). On the other hand, since + * the APM is stopped, we cannot access the HW (in particular not prph). + * So don't try to restock if the APM has been already stopped. + */ + if (!test_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status)) + return; + spin_lock_irqsave(&rxq->lock, flags); while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) { /* The overwritten rxb must be a used one */ @@ -219,7 +226,7 @@ static void iwlagn_rx_queue_restock(struct iwl_trans *trans) list_del(element); /* Point to Rx buffer via next RBD in circular buffer */ - rxq->bd[rxq->write] = iwlagn_dma_addr2rbd_ptr(rxb->page_dma); + rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(rxb->page_dma); rxq->queue[rxq->write] = rxb; rxq->write = (rxq->write + 1) & RX_QUEUE_MASK; rxq->free_count--; @@ -230,7 +237,6 @@ static void iwlagn_rx_queue_restock(struct iwl_trans *trans) if (rxq->free_count <= RX_LOW_WATERMARK) schedule_work(&trans_pcie->rx_replenish); - /* If we've added more space for the firmware to place data, tell it. * Increment device's write pointer in multiples of 8. */ if (rxq->write_actual != (rxq->write & ~0x7)) { @@ -241,15 +247,16 @@ static void iwlagn_rx_queue_restock(struct iwl_trans *trans) } } -/** - * iwlagn_rx_replenish - Move all used packet from rx_used to rx_free - * - * When moving to rx_free an SKB is allocated for the slot. +/* + * iwl_rx_allocate - allocate a page for each used RBD * - * Also restock the Rx queue via iwl_rx_queue_restock. - * This is called as a scheduled work item (except for during initialization) + * A used RBD is an Rx buffer that has been given to the stack. To use it again + * a page must be allocated and the RBD must point to the page. This function + * doesn't change the HW pointer but handles the list of pages that is used by + * iwl_rx_queue_restock. The latter function will update the HW to use the newly + * allocated buffers. */ -static void iwlagn_rx_allocate(struct iwl_trans *trans, gfp_t priority) +static void iwl_rx_allocate(struct iwl_trans *trans, gfp_t priority) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); struct iwl_rx_queue *rxq = &trans_pcie->rxq; @@ -328,23 +335,31 @@ static void iwlagn_rx_allocate(struct iwl_trans *trans, gfp_t priority) } } -void iwlagn_rx_replenish(struct iwl_trans *trans) +/* + * iwl_rx_replenish - Move all used buffers from rx_used to rx_free + * + * When moving to rx_free an page is allocated for the slot. + * + * Also restock the Rx queue via iwl_rx_queue_restock. + * This is called as a scheduled work item (except for during initialization) + */ +void iwl_rx_replenish(struct iwl_trans *trans) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); unsigned long flags; - iwlagn_rx_allocate(trans, GFP_KERNEL); + iwl_rx_allocate(trans, GFP_KERNEL); spin_lock_irqsave(&trans_pcie->irq_lock, flags); - iwlagn_rx_queue_restock(trans); + iwl_rx_queue_restock(trans); spin_unlock_irqrestore(&trans_pcie->irq_lock, flags); } -static void iwlagn_rx_replenish_now(struct iwl_trans *trans) +static void iwl_rx_replenish_now(struct iwl_trans *trans) { - iwlagn_rx_allocate(trans, GFP_ATOMIC); + iwl_rx_allocate(trans, GFP_ATOMIC); - iwlagn_rx_queue_restock(trans); + iwl_rx_queue_restock(trans); } void iwl_bg_rx_replenish(struct work_struct *data) @@ -352,7 +367,7 @@ void iwl_bg_rx_replenish(struct work_struct *data) struct iwl_trans_pcie *trans_pcie = container_of(data, struct iwl_trans_pcie, rx_replenish); - iwlagn_rx_replenish(trans_pcie->trans); + iwl_rx_replenish(trans_pcie->trans); } static void iwl_rx_handle_rxbuf(struct iwl_trans *trans, @@ -421,13 +436,23 @@ static void iwl_rx_handle_rxbuf(struct iwl_trans *trans, index = SEQ_TO_INDEX(sequence); cmd_index = get_cmd_index(&txq->q, index); - if (reclaim) - cmd = txq->entries[cmd_index].cmd; - else + if (reclaim) { + struct iwl_pcie_tx_queue_entry *ent; + ent = &txq->entries[cmd_index]; + cmd = ent->copy_cmd; + WARN_ON_ONCE(!cmd && ent->meta.flags & CMD_WANT_HCMD); + } else { cmd = NULL; + } err = iwl_op_mode_rx(trans->op_mode, &rxcb, cmd); + if (reclaim) { + /* The original command isn't needed any more */ + kfree(txq->entries[cmd_index].copy_cmd); + txq->entries[cmd_index].copy_cmd = NULL; + } + /* * After here, we should always check rxcb._page_stolen, * if it is true then one of the handlers took the page. @@ -520,7 +545,7 @@ static void iwl_rx_handle(struct iwl_trans *trans) count++; if (count >= 8) { rxq->read = i; - iwlagn_rx_replenish_now(trans); + iwl_rx_replenish_now(trans); count = 0; } } @@ -529,9 +554,9 @@ static void iwl_rx_handle(struct iwl_trans *trans) /* Backtrack one entry */ rxq->read = i; if (fill_rx) - iwlagn_rx_replenish_now(trans); + iwl_rx_replenish_now(trans); else - iwlagn_rx_queue_restock(trans); + iwl_rx_queue_restock(trans); } /** @@ -713,11 +738,9 @@ void iwl_irq_tasklet(struct iwl_trans *trans) /* Disable periodic interrupt; we use it as just a one-shot. */ iwl_write8(trans, CSR_INT_PERIODIC_REG, CSR_INT_PERIODIC_DIS); -#ifdef CONFIG_IWLWIFI_IDI - iwl_amfh_rx_handler(); -#else + iwl_rx_handle(trans); -#endif + /* * Enable periodic interrupt in 8 msec only if we received * real RX interrupt (instead of just periodic int), to catch |