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iwlwifi: mvm: dump the radio registers when the firmware crashes 

Dumping the content of the radio registers greatly helps
to debug PHY issues, which can lead to TFD queue hang.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Emmanuel Grumbach 2015-12-28 15:22:28 +02:00
parent ca95ff3a9f
commit 976f15a8ef
3 changed files with 46 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/intel/iwlwifi/iwl-fw-error-dump.h
View File

@ -88,6 +88,7 @@
* &struct iwl_fw_error_dump_rb
* @IWL_FW_ERROR_PAGING: UMAC's image memory segments which were
* paged to the DRAM.
* @IWL_FW_ERROR_DUMP_RADIO_REG: Dump the radio registers.
*/
enum iwl_fw_error_dump_type {
/* 0 is deprecated */
@ -103,6 +104,7 @@ enum iwl_fw_error_dump_type {
IWL_FW_ERROR_DUMP_ERROR_INFO = 10,
IWL_FW_ERROR_DUMP_RB = 11,
IWL_FW_ERROR_DUMP_PAGING = 12,
IWL_FW_ERROR_DUMP_RADIO_REG = 13,
IWL_FW_ERROR_DUMP_MAX,
};

6
drivers/net/wireless/intel/iwlwifi/iwl-prph.h
View File

@ -345,6 +345,12 @@ enum secure_load_status_reg {
#define TXF_READ_MODIFY_DATA (0xa00448)
#define TXF_READ_MODIFY_ADDR (0xa0044c)
/* Radio registers access */
#define RSP_RADIO_CMD (0xa02804)
#define RSP_RADIO_RDDAT (0xa02814)
#define RADIO_RSP_ADDR_POS (6)
#define RADIO_RSP_RD_CMD (3)
/* FW monitor */
#define MON_BUFF_SAMPLE_CTL (0xa03c00)
#define MON_BUFF_BASE_ADDR (0xa03c3c)

40
drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c
View File

@ -113,6 +113,35 @@ static void iwl_mvm_free_coredump(const void *data)
kfree(fw_error_dump);
}
#define RADIO_REG_MAX_READ 0x2ad
static void iwl_mvm_read_radio_reg(struct iwl_mvm *mvm,
struct iwl_fw_error_dump_data **dump_data)
{
u8 *pos = (void *)(*dump_data)->data;
unsigned long flags;
int i;
if (!iwl_trans_grab_nic_access(mvm->trans, &flags))
return;
(*dump_data)->type = cpu_to_le32(IWL_FW_ERROR_DUMP_RADIO_REG);
(*dump_data)->len = cpu_to_le32(RADIO_REG_MAX_READ);
for (i = 0; i < RADIO_REG_MAX_READ; i++) {
u32 rd_cmd = RADIO_RSP_RD_CMD;
rd_cmd |= i << RADIO_RSP_ADDR_POS;
iwl_write_prph_no_grab(mvm->trans, RSP_RADIO_CMD, rd_cmd);
*pos = (u8)iwl_read_prph_no_grab(mvm->trans, RSP_RADIO_RDDAT);
pos++;
}
*dump_data = iwl_fw_error_next_data(*dump_data);
iwl_trans_release_nic_access(mvm->trans, &flags);
}
static void iwl_mvm_dump_fifos(struct iwl_mvm *mvm,
struct iwl_fw_error_dump_data **dump_data)
{
@ -401,7 +430,7 @@ void iwl_mvm_fw_error_dump(struct iwl_mvm *mvm)
struct iwl_fw_error_dump_trigger_desc *dump_trig;
struct iwl_mvm_dump_ptrs *fw_error_dump;
u32 sram_len, sram_ofs;
u32 file_len, fifo_data_len = 0, prph_len = 0;
u32 file_len, fifo_data_len = 0, prph_len = 0, radio_len = 0;
u32 smem_len = mvm->cfg->smem_len;
u32 sram2_len = mvm->cfg->dccm2_len;
bool monitor_dump_only = false;
@ -472,6 +501,9 @@ void iwl_mvm_fw_error_dump(struct iwl_mvm *mvm)
sizeof(struct iwl_fw_error_dump_prph) +
num_bytes_in_chunk;
}
if (mvm->cfg->device_family == IWL_DEVICE_FAMILY_7000)
radio_len = sizeof(*dump_data) + RADIO_REG_MAX_READ;
}
file_len = sizeof(*dump_file) +
@ -479,6 +511,7 @@ void iwl_mvm_fw_error_dump(struct iwl_mvm *mvm)
sram_len + sizeof(*dump_mem) +
fifo_data_len +
prph_len +
radio_len +
sizeof(*dump_info);
/* Make room for the SMEM, if it exists */
@ -543,8 +576,11 @@ void iwl_mvm_fw_error_dump(struct iwl_mvm *mvm)
dump_data = iwl_fw_error_next_data(dump_data);
/* We only dump the FIFOs if the FW is in error state */
if (test_bit(STATUS_FW_ERROR, &mvm->trans->status))
if (test_bit(STATUS_FW_ERROR, &mvm->trans->status)) {
iwl_mvm_dump_fifos(mvm, &dump_data);
if (radio_len)
iwl_mvm_read_radio_reg(mvm, &dump_data);
}
if (mvm->fw_dump_desc) {
dump_data->type = cpu_to_le32(IWL_FW_ERROR_DUMP_ERROR_INFO);