From b1753c62c72fe70035498b28901f9a4bdcf2b92a Mon Sep 17 00:00:00 2001 From: Sara Sharon Date: Tue, 21 Jun 2016 12:44:01 +0300 Subject: [PATCH] iwlwifi: pcie: track rxb status In MQ environment and new architecture in early stages we may encounter DMA issues. Track RXB status and bail out in case we receive index to an RXB that was not mapped and handed over to HW. Signed-off-by: Sara Sharon Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/pcie/internal.h | 2 ++ drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 10 +++++++++- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h index 54af3daddd24..190f611af8ee 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h +++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h @@ -68,12 +68,14 @@ struct iwl_host_cmd; * struct iwl_rx_mem_buffer * @page_dma: bus address of rxb page * @page: driver's pointer to the rxb page + * @invalid: rxb is in driver ownership - not owned by HW * @vid: index of this rxb in the global table */ struct iwl_rx_mem_buffer { dma_addr_t page_dma; struct page *page; u16 vid; + bool invalid; struct list_head list; }; diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c index 45f1b7e716a5..153b3084de0b 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c @@ -266,7 +266,7 @@ static void iwl_pcie_rxmq_restock(struct iwl_trans *trans, rxb = list_first_entry(&rxq->rx_free, struct iwl_rx_mem_buffer, list); list_del(&rxb->list); - + rxb->invalid = false; /* 12 first bits are expected to be empty */ WARN_ON(rxb->page_dma & DMA_BIT_MASK(12)); /* Point to Rx buffer via next RBD in circular buffer */ @@ -317,6 +317,7 @@ static void iwl_pcie_rxsq_restock(struct iwl_trans *trans, rxb = list_first_entry(&rxq->rx_free, struct iwl_rx_mem_buffer, list); list_del(&rxb->list); + rxb->invalid = false; /* Point to Rx buffer via next RBD in circular buffer */ bd[rxq->write] = iwl_pcie_dma_addr2rbd_ptr(rxb->page_dma); @@ -961,6 +962,7 @@ int iwl_pcie_rx_init(struct iwl_trans *trans) list_add(&rxb->list, &def_rxq->rx_used); trans_pcie->global_table[i] = rxb; rxb->vid = (u16)(i + 1); + rxb->invalid = true; } iwl_pcie_rxq_alloc_rbs(trans, GFP_KERNEL, def_rxq); @@ -1256,6 +1258,12 @@ restart: goto out; } rxb = trans_pcie->global_table[vid - 1]; + if (WARN(rxb->invalid, + "Invalid rxb from HW %u\n", (u32)vid)) { + iwl_force_nmi(trans); + goto out; + } + rxb->invalid = true; } else { rxb = rxq->queue[i]; rxq->queue[i] = NULL; -- 2.20.1