From bd7fc617af118531e364d727ed02b0ded2bb4fc0 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Wed, 15 Jul 2015 23:15:08 +0300 Subject: [PATCH] iwlwifi: pcie: dump RBs when FW error occurs Add support for dumping all the RBs in the RX queue when FW error occurs. This will assist debugging. Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h | 17 +++++++ drivers/net/wireless/iwlwifi/pcie/trans.c | 59 +++++++++++++++++++++++- 2 files changed, 74 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h b/drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h index e57dbd0ef2e1..af5b3201492c 100644 --- a/drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h +++ b/drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h @@ -84,6 +84,8 @@ * @IWL_FW_ERROR_DUMP_MEM: chunk of memory * @IWL_FW_ERROR_DUMP_ERROR_INFO: description of what triggered this dump. * Structured as &struct iwl_fw_error_dump_trigger_desc. + * @IWL_FW_ERROR_DUMP_RB: the content of an RB structured as + * &struct iwl_fw_error_dump_rb */ enum iwl_fw_error_dump_type { /* 0 is deprecated */ @@ -97,6 +99,7 @@ enum iwl_fw_error_dump_type { IWL_FW_ERROR_DUMP_FH_REGS = 8, IWL_FW_ERROR_DUMP_MEM = 9, IWL_FW_ERROR_DUMP_ERROR_INFO = 10, + IWL_FW_ERROR_DUMP_RB = 11, IWL_FW_ERROR_DUMP_MAX, }; @@ -223,6 +226,20 @@ struct iwl_fw_error_dump_mem { }; /** + * struct iwl_fw_error_dump_rb - content of an Receive Buffer + * @index: the index of the Receive Buffer in the Rx queue + * @rxq: the RB's Rx queue + * @reserved: + * @data: the content of the Receive Buffer + */ +struct iwl_fw_error_dump_rb { + __le32 index; + __le32 rxq; + __le32 reserved; + u8 data[]; +}; + +/** * iwl_fw_error_next_data - advance fw error dump data pointer * @data: previous data block * Returns: next data block diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c index 8cc8f2b703a2..9ebdd8009717 100644 --- a/drivers/net/wireless/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/iwlwifi/pcie/trans.c @@ -2275,6 +2275,47 @@ static u32 iwl_trans_pcie_dump_prph(struct iwl_trans *trans, return prph_len; } +static u32 iwl_trans_pcie_dump_rbs(struct iwl_trans *trans, + struct iwl_fw_error_dump_data **data, + int allocated_rb_nums) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + int max_len = PAGE_SIZE << trans_pcie->rx_page_order; + struct iwl_rxq *rxq = &trans_pcie->rxq; + u32 i, r, j, rb_len = 0; + + spin_lock(&rxq->lock); + + r = le16_to_cpu(ACCESS_ONCE(rxq->rb_stts->closed_rb_num)) & 0x0FFF; + + for (i = rxq->read, j = 0; + i != r && j < allocated_rb_nums; + i = (i + 1) & RX_QUEUE_MASK, j++) { + struct iwl_rx_mem_buffer *rxb = rxq->queue[i]; + struct iwl_fw_error_dump_rb *rb; + + dma_unmap_page(trans->dev, rxb->page_dma, max_len, + DMA_FROM_DEVICE); + + rb_len += sizeof(**data) + sizeof(*rb) + max_len; + + (*data)->type = cpu_to_le32(IWL_FW_ERROR_DUMP_RB); + (*data)->len = cpu_to_le32(sizeof(*rb) + max_len); + rb = (void *)(*data)->data; + rb->index = cpu_to_le32(i); + memcpy(rb->data, page_address(rxb->page), max_len); + /* remap the page for the free benefit */ + rxb->page_dma = dma_map_page(trans->dev, rxb->page, 0, + max_len, + DMA_FROM_DEVICE); + + *data = iwl_fw_error_next_data(*data); + } + + spin_unlock(&rxq->lock); + + return rb_len; +} #define IWL_CSR_TO_DUMP (0x250) static u32 iwl_trans_pcie_dump_csr(struct iwl_trans *trans, @@ -2352,9 +2393,10 @@ struct iwl_trans_dump_data *iwl_trans_pcie_dump_data(struct iwl_trans *trans) struct iwl_txq *cmdq = &trans_pcie->txq[trans_pcie->cmd_queue]; struct iwl_fw_error_dump_txcmd *txcmd; struct iwl_trans_dump_data *dump_data; - u32 len; + u32 len, num_rbs; u32 monitor_len; int i, ptr; + bool dump_rbs = test_bit(STATUS_FW_ERROR, &trans->status); /* transport dump header */ len = sizeof(*dump_data); @@ -2379,6 +2421,17 @@ struct iwl_trans_dump_data *iwl_trans_pcie_dump_data(struct iwl_trans *trans) /* FH registers */ len += sizeof(*data) + (FH_MEM_UPPER_BOUND - FH_MEM_LOWER_BOUND); + if (dump_rbs) { + /* RBs */ + num_rbs = le16_to_cpu(ACCESS_ONCE( + trans_pcie->rxq.rb_stts->closed_rb_num)) + & 0x0FFF; + num_rbs = (num_rbs - trans_pcie->rxq.read) & RX_QUEUE_MASK; + len += num_rbs * (sizeof(*data) + + sizeof(struct iwl_fw_error_dump_rb) + + (PAGE_SIZE << trans_pcie->rx_page_order)); + } + /* FW monitor */ if (trans_pcie->fw_mon_page) { len += sizeof(*data) + sizeof(struct iwl_fw_error_dump_fw_mon) + @@ -2442,8 +2495,10 @@ struct iwl_trans_dump_data *iwl_trans_pcie_dump_data(struct iwl_trans *trans) len += iwl_trans_pcie_dump_prph(trans, &data); len += iwl_trans_pcie_dump_csr(trans, &data); len += iwl_trans_pcie_fh_regs_dump(trans, &data); - /* data is already pointing to the next section */ + if (dump_rbs) + len += iwl_trans_pcie_dump_rbs(trans, &data, num_rbs); + /* data is already pointing to the next section */ if ((trans_pcie->fw_mon_page && trans->cfg->device_family == IWL_DEVICE_FAMILY_7000) || trans->dbg_dest_tlv) { -- 2.11.0