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iwlwifi: pcie: dump RBs when FW error occurs

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Add support for dumping all the RBs in the RX queue
when FW error occurs.
This will assist debugging.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Emmanuel Grumbach 2015-07-15 23:15:08 +03:00
parent 192de2b406
commit bd7fc617af
2 changed files with 74 additions and 2 deletions
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17
drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h
View File

@ -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,
};
@ -222,6 +225,20 @@ struct iwl_fw_error_dump_mem {
u8 data[];
};
/**
* 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

59
drivers/net/wireless/iwlwifi/pcie/trans.c
View File

@ -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) {