[PATCH 07/21] ath10k: save firmware RAM and ROM BSS sections on crash
greearb at candelatech.com
greearb at candelatech.com
Mon May 9 16:11:01 PDT 2016
From: Ben Greear <greearb at candelatech.com>
This can be used to get a useful back trace out of a firmware
crash that involves an interrupt handler. For instance, a
null-pointer-exception would be this kind of trace. A user-space
tool can read the debugfs file and decode things as wished.
This requires a packaged firmware with a new IE to describe the
BSS section starts and length.
Signed-off-by: Ben Greear <greearb at candelatech.com>
Signed-off-by: Kalle Valo <kvalo at qca.qualcomm.com>
---
drivers/net/wireless/ath/ath10k/core.c | 48 +++++++++++++++++++++++++++++
drivers/net/wireless/ath/ath10k/core.h | 14 +++++++++
drivers/net/wireless/ath/ath10k/debug.c | 40 +++++++++++++++++++++++-
drivers/net/wireless/ath/ath10k/hw.h | 2 ++
drivers/net/wireless/ath/ath10k/pci.c | 54 +++++++++++++++++++++++++++++++++
5 files changed, 157 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index b7318b8..3f1786c 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -922,6 +922,13 @@ err:
return ret;
}
+struct ath10k_bss_rom_ie {
+ __le32 ram_addr;
+ __le32 ram_len;
+ __le32 rom_addr;
+ __le32 rom_len;
+} __packed;
+
static int ath10k_core_create_board_name(struct ath10k *ar, char *name,
size_t name_len)
{
@@ -983,6 +990,7 @@ int ath10k_core_fetch_firmware_api_n(struct ath10k *ar, const char *name,
struct ath10k_fw_ie *hdr;
const u8 *data;
__le32 *timestamp, *version;
+ struct ath10k_bss_rom_ie *bss;
/* first fetch the firmware file (firmware-*.bin) */
fw_file->firmware = ath10k_fetch_fw_file(ar, ar->hw_params.fw.dir,
@@ -1100,6 +1108,12 @@ int ath10k_core_fetch_firmware_api_n(struct ath10k *ar, const char *name,
break;
case ATH10K_FW_IE_WMI_OP_VERSION:
+ /* Upstream stole the ID CT firmware was using, so add
+ * hack-around to deal with backwards-compat. --Ben
+ */
+ if (ie_len >= sizeof(*bss))
+ goto fw_ie_bss_info_ct;
+
if (ie_len != sizeof(u32))
break;
@@ -1128,6 +1142,40 @@ int ath10k_core_fetch_firmware_api_n(struct ath10k *ar, const char *name,
fw_file->codeswap_data = data;
fw_file->codeswap_len = ie_len;
break;
+ case ATH10K_FW_IE_BSS_INFO_CT:
+fw_ie_bss_info_ct:
+ if (ie_len < sizeof(*bss)) {
+ ath10k_warn(ar, "invalid ie len for bss-info (%zd)\n",
+ ie_len);
+ break;
+ }
+ bss = (struct ath10k_bss_rom_ie *)(data);
+
+ fw_file->ram_bss_addr = le32_to_cpu(bss->ram_addr);
+ fw_file->ram_bss_len = le32_to_cpu(bss->ram_len);
+ ath10k_dbg(ar, ATH10K_DBG_BOOT,
+ "found RAM BSS addr 0x%x length %d\n",
+ fw_file->ram_bss_addr, fw_file->ram_bss_len);
+
+ if (fw_file->ram_bss_len > ATH10K_RAM_BSS_BUF_LEN) {
+ ath10k_warn(ar, "too long firmware RAM BSS length: %d\n",
+ fw_file->ram_bss_len);
+ fw_file->ram_bss_len = 0;
+ }
+
+ fw_file->rom_bss_addr = le32_to_cpu(bss->rom_addr);
+ fw_file->rom_bss_len = le32_to_cpu(bss->rom_len);
+ ath10k_dbg(ar, ATH10K_DBG_BOOT,
+ "found ROM BSS addr 0x%x length %d\n",
+ fw_file->rom_bss_addr, fw_file->rom_bss_len);
+
+ if (fw_file->rom_bss_len > ATH10K_ROM_BSS_BUF_LEN) {
+ ath10k_warn(ar, "too long firmware ROM BSS length: %d\n",
+ fw_file->rom_bss_len);
+ fw_file->rom_bss_len = 0;
+ }
+
+ break;
default:
ath10k_warn(ar, "Unknown FW IE: %u\n",
le32_to_cpu(hdr->id));
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 644d077..6aa7a14 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -420,6 +420,10 @@ struct ath10k_dbglog_entry_storage {
#define DBGLOG_NUM_ARGS_MASK 0xFC000000 /* Bit 26-31 */
#define DBGLOG_NUM_ARGS_MAX 5 /* firmware tool chain limit */
+/* estimated values, hopefully these are enough */
+#define ATH10K_ROM_BSS_BUF_LEN 30000
+#define ATH10K_RAM_BSS_BUF_LEN 10000
+
/* used for crash-dump storage, protected by data-lock */
struct ath10k_fw_crash_data {
bool crashed_since_read;
@@ -431,6 +435,8 @@ struct ath10k_fw_crash_data {
__le32 exc_stack_buf[ATH10K_FW_STACK_SIZE / sizeof(__le32)];
__le32 stack_addr;
__le32 exc_stack_addr;
+ __le32 rom_bss_buf[ATH10K_ROM_BSS_BUF_LEN / sizeof(__le32)];
+ __le32 ram_bss_buf[ATH10K_RAM_BSS_BUF_LEN / sizeof(__le32)];
};
struct ath10k_debug {
@@ -666,6 +672,14 @@ struct ath10k_fw_file {
const void *codeswap_data;
size_t codeswap_len;
+
+ /* These are written to only during first firmware load from user
+ * space so no need for any locking.
+ */
+ u32 ram_bss_addr;
+ u32 ram_bss_len;
+ u32 rom_bss_addr;
+ u32 rom_bss_len;
};
struct ath10k_fw_components {
diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index 7bc3053..28e0c05 100644
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -38,12 +38,16 @@
* @ATH10K_FW_ERROR_DUMP_DBGLOG: Recent firmware debug log entries
* @ATH10K_FW_CRASH_DUMP_STACK: Stack memory contents.
* @ATH10K_FW_CRASH_DUMP_EXC_STACK: Exception stack memory contents.
+ * @ATH10K_FW_CRASH_DUMP_RAM_BSS: BSS area for RAM code
+ * @ATH10K_FW_CRASH_DUMP_ROM_BSS: BSS area for ROM code
*/
enum ath10k_fw_crash_dump_type {
ATH10K_FW_CRASH_DUMP_REGISTERS = 0,
ATH10K_FW_CRASH_DUMP_DBGLOG = 1,
ATH10K_FW_CRASH_DUMP_STACK = 2,
ATH10K_FW_CRASH_DUMP_EXC_STACK = 3,
+ ATH10K_FW_CRASH_DUMP_RAM_BSS = 4,
+ ATH10K_FW_CRASH_DUMP_ROM_BSS = 5,
ATH10K_FW_CRASH_DUMP_MAX,
};
@@ -110,9 +114,11 @@ struct ath10k_dump_file_data {
__le32 stack_addr;
__le32 exc_stack_addr;
+ __le32 rom_bss_addr;
+ __le32 ram_bss_addr;
/* room for growth w/out changing binary format */
- u8 unused[120];
+ u8 unused[112];
/* struct ath10k_tlv_dump_data + more */
u8 data[0];
@@ -808,6 +814,14 @@ static struct ath10k_dump_file_data *ath10k_build_dump_file(struct ath10k *ar)
len += sizeof(*dump_tlv) + sizeof(crash_data->stack_buf);
len += sizeof(*dump_tlv) + sizeof(crash_data->exc_stack_buf);
+ if (ar->running_fw->fw_file.ram_bss_addr &&
+ ar->running_fw->fw_file.ram_bss_len)
+ len += sizeof(*dump_tlv) + ar->running_fw->fw_file.ram_bss_len;
+
+ if (ar->running_fw->fw_file.rom_bss_addr &&
+ ar->running_fw->fw_file.rom_bss_len)
+ len += sizeof(*dump_tlv) + ar->running_fw->fw_file.rom_bss_len;
+
sofar += hdr_len;
/* This is going to get big when we start dumping FW RAM and such,
@@ -848,6 +862,10 @@ static struct ath10k_dump_file_data *ath10k_build_dump_file(struct ath10k *ar)
dump_data->num_rf_chains = cpu_to_le32(ar->num_rf_chains);
dump_data->stack_addr = cpu_to_le32(crash_data->stack_addr);
dump_data->exc_stack_addr = cpu_to_le32(crash_data->exc_stack_addr);
+ dump_data->rom_bss_addr =
+ cpu_to_le32(ar->running_fw->fw_file.rom_bss_addr);
+ dump_data->ram_bss_addr =
+ cpu_to_le32(ar->running_fw->fw_file.ram_bss_addr);
strlcpy(dump_data->fw_ver, ar->hw->wiphy->fw_version,
sizeof(dump_data->fw_ver));
@@ -898,6 +916,26 @@ static struct ath10k_dump_file_data *ath10k_build_dump_file(struct ath10k *ar)
memcpy(dump_tlv->tlv_data, crash_data->exc_stack_buf, tmp);
sofar += sizeof(*dump_tlv) + tmp;
+ if (ar->running_fw->fw_file.ram_bss_addr &&
+ ar->running_fw->fw_file.ram_bss_len) {
+ tmp = ar->running_fw->fw_file.ram_bss_len;
+ dump_tlv = (struct ath10k_tlv_dump_data *)(buf + sofar);
+ dump_tlv->type = cpu_to_le32(ATH10K_FW_CRASH_DUMP_RAM_BSS);
+ dump_tlv->tlv_len = cpu_to_le32(tmp);
+ memcpy(dump_tlv->tlv_data, crash_data->ram_bss_buf, tmp);
+ sofar += sizeof(*dump_tlv) + tmp;
+ }
+
+ if (ar->running_fw->fw_file.rom_bss_addr &&
+ ar->running_fw->fw_file.rom_bss_len) {
+ tmp = ar->running_fw->fw_file.rom_bss_len;
+ dump_tlv = (struct ath10k_tlv_dump_data *)(buf + sofar);
+ dump_tlv->type = cpu_to_le32(ATH10K_FW_CRASH_DUMP_ROM_BSS);
+ dump_tlv->tlv_len = cpu_to_le32(tmp);
+ memcpy(dump_tlv->tlv_data, crash_data->rom_bss_buf, tmp);
+ sofar += sizeof(*dump_tlv) + tmp;
+ }
+
ar->debug.fw_crash_data->crashed_since_read = false;
WARN_ON(sofar != len);
diff --git a/drivers/net/wireless/ath/ath10k/hw.h b/drivers/net/wireless/ath/ath10k/hw.h
index e86ebf0..7b80e29 100644
--- a/drivers/net/wireless/ath/ath10k/hw.h
+++ b/drivers/net/wireless/ath/ath10k/hw.h
@@ -149,6 +149,8 @@ enum ath10k_fw_ie_type {
/* Code swap image for firmware binary */
ATH10K_FW_IE_FW_CODE_SWAP_IMAGE = 7,
+
+ ATH10K_FW_IE_BSS_INFO_CT = 30,
};
enum ath10k_fw_wmi_op_version {
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 62dd167..e6315ec 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -1424,6 +1424,58 @@ u16 ath10k_pci_hif_get_free_queue_number(struct ath10k *ar, u8 pipe)
return ath10k_ce_num_free_src_entries(ar_pci->pipe_info[pipe].ce_hdl);
}
+static void ath10k_pci_dump_bss_ram(struct ath10k *ar,
+ struct ath10k_fw_crash_data *crash_data)
+{
+ int ret;
+
+ if (!crash_data)
+ return;
+
+ lockdep_assert_held(&ar->data_lock);
+
+ if (!ar->running_fw->fw_file.ram_bss_addr)
+ return;
+
+ if (!ar->running_fw->fw_file.ram_bss_len)
+ return;
+
+ ret = ath10k_pci_diag_read_mem(ar, ar->running_fw->fw_file.ram_bss_addr,
+ crash_data->ram_bss_buf,
+ ar->running_fw->fw_file.ram_bss_len);
+ if (ret)
+ ath10k_warn(ar,
+ "failed to read firmware RAM BSS memory from %d (%d B): %d\n",
+ ar->running_fw->fw_file.ram_bss_addr,
+ ar->running_fw->fw_file.ram_bss_len, ret);
+}
+
+static void ath10k_pci_dump_bss_rom(struct ath10k *ar,
+ struct ath10k_fw_crash_data *crash_data)
+{
+ int ret;
+
+ if (!crash_data)
+ return;
+
+ lockdep_assert_held(&ar->data_lock);
+
+ if (!ar->running_fw->fw_file.rom_bss_addr)
+ return;
+
+ if (!ar->running_fw->fw_file.rom_bss_len)
+ return;
+
+ ret = ath10k_pci_diag_read_mem(ar, ar->running_fw->fw_file.rom_bss_addr,
+ crash_data->rom_bss_buf,
+ ar->running_fw->fw_file.rom_bss_len);
+ if (ret)
+ ath10k_warn(ar,
+ "failed to read firmware ROM BSS memory from %d (%d B): %d\n",
+ ar->running_fw->fw_file.rom_bss_addr,
+ ar->running_fw->fw_file.rom_bss_len, ret);
+}
+
/* Save the main firmware stack */
static void ath10k_pci_dump_stack(struct ath10k *ar,
struct ath10k_fw_crash_data *crash_data)
@@ -1607,6 +1659,8 @@ static void ath10k_pci_fw_crashed_dump(struct ath10k *ar)
ath10k_pci_dump_dbglog(ar);
ath10k_pci_dump_stack(ar, crash_data);
ath10k_pci_dump_exc_stack(ar, crash_data);
+ ath10k_pci_dump_bss_ram(ar, crash_data);
+ ath10k_pci_dump_bss_rom(ar, crash_data);
if (crash_data)
crash_data->crashed_since_read = true;
--
2.4.3
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