From: Dinesh Karthikeyan <quic_dinek@xxxxxxxxxxx> Add debugfs support to simulate firmware crash to test firmware restart. Usage: ----- echo assert > /sys/kernel/debug/ath12k/pci-0000\:58\:00.0/simulate_fw_crash Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1 Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 Signed-off-by: Dinesh Karthikeyan <quic_dinek@xxxxxxxxxxx> Signed-off-by: Ramya Gnanasekar <quic_rgnanase@xxxxxxxxxxx> --- Depends-On: [PATCH v5] wifi: ath12k: Add firmware coredump collection support Link: https://lore.kernel.org/linux-wireless/f77ed82f-299b-4f99-bc83-39c053b8042b@xxxxxxxxxxx/ --- drivers/net/wireless/ath/ath12k/debugfs.c | 76 +++++++++++++++++++++++ drivers/net/wireless/ath/ath12k/debugfs.h | 4 ++ drivers/net/wireless/ath/ath12k/mac.c | 2 + 3 files changed, 82 insertions(+) diff --git a/drivers/net/wireless/ath/ath12k/debugfs.c b/drivers/net/wireless/ath/ath12k/debugfs.c index 2a977c36af00..4d1cd4d5e3df 100644 --- a/drivers/net/wireless/ath/ath12k/debugfs.c +++ b/drivers/net/wireless/ath/ath12k/debugfs.c @@ -6,6 +6,7 @@ #include "core.h" #include "debugfs.h" +#include "debug.h" #include "debugfs_htt_stats.h" static ssize_t ath12k_write_simulate_radar(struct file *file, @@ -31,6 +32,81 @@ static const struct file_operations fops_simulate_radar = { .open = simple_open }; +static ssize_t ath12k_read_simulate_fw_crash(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + const char buf[] = + "To simulate firmware crash write one of the keywords to this file:\n" + "`assert` - send WMI_FORCE_FW_HANG_CMDID to firmware to cause assert.\n"; + + return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); +} + +static ssize_t ath12k_write_simulate_fw_crash(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct ath12k_base *ab = file->private_data; + struct ath12k_pdev *pdev; + struct ath12k *ar = NULL; + char buf[32] = {0}; + int i, ret; + ssize_t rc; + + /* filter partial writes and invalid commands */ + if (*ppos != 0 || count >= sizeof(buf) || count == 0) + return -EINVAL; + + rc = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count); + if (rc < 0) + return rc; + + /* drop the possible '\n' from the end */ + if (buf[*ppos - 1] == '\n') + buf[*ppos - 1] = '\0'; + + for (i = 0; i < ab->num_radios; i++) { + pdev = &ab->pdevs[i]; + ar = pdev->ar; + if (ar) + break; + } + + if (!ar) + return -ENETDOWN; + + if (!strcmp(buf, "assert")) { + ath12k_info(ab, "simulating firmware assert crash\n"); + ret = ath12k_wmi_force_fw_hang_cmd(ar, + ATH12K_WMI_FW_HANG_ASSERT_TYPE, + ATH12K_WMI_FW_HANG_DELAY); + } else { + return -EINVAL; + } + + if (ret) { + ath12k_warn(ab, "failed to simulate firmware crash: %d\n", ret); + return ret; + } + + return count; +} + +static const struct file_operations fops_simulate_fw_crash = { + .read = ath12k_read_simulate_fw_crash, + .write = ath12k_write_simulate_fw_crash, + .open = simple_open, + .owner = THIS_MODULE, + .llseek = default_llseek, +}; + +void ath12k_debugfs_pdev_create(struct ath12k_base *ab) +{ + debugfs_create_file("simulate_fw_crash", 0600, ab->debugfs_soc, ab, + &fops_simulate_fw_crash); +} + void ath12k_debugfs_soc_create(struct ath12k_base *ab) { bool dput_needed; diff --git a/drivers/net/wireless/ath/ath12k/debugfs.h b/drivers/net/wireless/ath/ath12k/debugfs.h index 8d64ba03aa9a..4b59906c03d6 100644 --- a/drivers/net/wireless/ath/ath12k/debugfs.h +++ b/drivers/net/wireless/ath/ath12k/debugfs.h @@ -12,6 +12,7 @@ void ath12k_debugfs_soc_create(struct ath12k_base *ab); void ath12k_debugfs_soc_destroy(struct ath12k_base *ab); void ath12k_debugfs_register(struct ath12k *ar); void ath12k_debugfs_unregister(struct ath12k *ar); +void ath12k_debugfs_pdev_create(struct ath12k_base *ab); #else static inline void ath12k_debugfs_soc_create(struct ath12k_base *ab) { @@ -29,6 +30,9 @@ static inline void ath12k_debugfs_unregister(struct ath12k *ar) { } +static inline void ath12k_debugfs_pdev_create(struct ath12k_base *ab) +{ +} #endif /* CONFIG_ATH12K_DEBUGFS */ #endif /* _ATH12K_DEBUGFS_H_ */ diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c index 137394c36460..8947ca308dbb 100644 --- a/drivers/net/wireless/ath/ath12k/mac.c +++ b/drivers/net/wireless/ath/ath12k/mac.c @@ -9347,6 +9347,8 @@ int ath12k_mac_register(struct ath12k_base *ab) if (test_bit(ATH12K_FLAG_REGISTERED, &ab->dev_flags)) return 0; + ath12k_debugfs_pdev_create(ab); + /* Initialize channel counters frequency value in hertz */ ab->cc_freq_hz = 320000; ab->free_vdev_map = (1LL << (ab->num_radios * TARGET_NUM_VDEVS)) - 1; -- 2.34.1
