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Date: Fri, 8 May 2020 08:11:24 +0200
From: Daniel Vetter <daniel@...ll.ch>
To: Luis Chamberlain <mcgrof@...nel.org>
Cc: jeyu@...nel.org, akpm@...ux-foundation.org, arnd@...db.de,
rostedt@...dmis.org, mingo@...hat.com, aquini@...hat.com,
cai@....pw, dyoung@...hat.com, bhe@...hat.com,
peterz@...radead.org, tglx@...utronix.de, gpiccoli@...onical.com,
pmladek@...e.com, tiwai@...e.de, schlad@...e.de,
andriy.shevchenko@...ux.intel.com, keescook@...omium.org,
daniel.vetter@...ll.ch, will@...nel.org,
mchehab+samsung@...nel.org, kvalo@...eaurora.org,
davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: [RFC] taint: add module firmware crash taint support
On Fri, May 08, 2020 at 02:14:38AM +0000, Luis Chamberlain wrote:
> Device driver firmware can crash, and sometimes, this can leave your
> system in a state which makes the device or subsystem completely
> useless. Detecting this by inspecting /proc/sys/kernel/tainted instead
> of scraping some magical words from the kernel log, which is driver
> specific, is much easier. So instead provide a helper which lets drivers
> annotate this.
>
> Once this happens, scrapers can easily scrape modules taint flags.
> This will taint both the kernel and respective calling module.
>
> The new helper module_firmware_crashed() uses LOCKDEP_STILL_OK as
> this fact should in no way shape or form affect lockdep. This taint
> is device driver specific.
>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>
> Below is the full diff stat of manual inspection throughout the kernel
> when this happens. My methodology is to just scrape for "crash" and
> then study the driver a bit to see if indeed it seems like that the
> firmware crashes there. In *many* cases there is even infrastructure
> for this, so this is sometimes clearly obvious. Some other times it
> required a bit of deciphering.
>
> The diff stat below is what I have so far, however the patch below
> only includes the drivers that start with Q, as they were a source of
> inspiration for this, and to make this RFC easier to read.
>
> If this seems sensible, I can follow up with the kernel helper first,
> and then tackle each subsystem independently.
>
> I purposely skipped review of remoteproc and virtualization. That should
> require its own separate careful review and considerations.
>
> drivers/atm/nicstar.c | 1 +
> drivers/bluetooth/hci_qca.c | 1 +
> drivers/gpu/drm/i915/i915_gpu_error.c | 1 +
> drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c | 2 ++
> drivers/gpu/drm/msm/msm_gpu.c | 1 +
I'm not finding the drm changes in your diff below ... Also what Kees
said, I think best to split this up and properly cc per
get_maintainers.pl.
-Daniel
> drivers/media/dvb-frontends/sp8870.c | 1 +
> drivers/media/pci/ttpci/av7110.c | 1 +
> drivers/misc/mic/cosm/cosm_scif_server.c | 1 +
> drivers/net/ethernet/8390/axnet_cs.c | 4 +++-
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 1 +
> drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 1 +
> drivers/net/ethernet/brocade/bna/bfa_ioc.c | 1 +
> drivers/net/ethernet/cavium/liquidio/lio_main.c | 1 +
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 1 +
> drivers/net/ethernet/ibm/ehea/ehea_main.c | 2 ++
> drivers/net/ethernet/qlogic/qed/qed_debug.c | 3 +++
> drivers/net/ipa/ipa_modem.c | 1 +
> drivers/net/wimax/i2400m/rx.c | 1 +
> drivers/net/wireless/ath/ath10k/pci.c | 2 ++
> drivers/net/wireless/ath/ath10k/sdio.c | 2 ++
> drivers/net/wireless/ath/ath10k/snoc.c | 1 +
> drivers/net/wireless/ath/ath6kl/hif.c | 1 +
> .../net/wireless/broadcom/brcm80211/brcmfmac/core.c | 1 +
> drivers/net/wireless/marvell/mwl8k.c | 1 +
> drivers/scsi/bfa/bfa_ioc.c | 1 +
> drivers/scsi/megaraid/megaraid_sas_fusion.c | 1 +
> drivers/scsi/qla4xxx/ql4_mbx.c | 2 ++
> drivers/staging/media/omap4iss/iss.c | 1 +
> include/linux/kernel.h | 3 ++-
> include/linux/module.h | 13 +++++++++++++
> include/trace/events/module.h | 3 ++-
> kernel/module.c | 5 +++--
> kernel/panic.c | 1 +
> 33 files changed, 58 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/qlogic/qed/qed_debug.c b/drivers/net/ethernet/qlogic/qed/qed_debug.c
> index f4eebaabb6d0..9cc6287b889b 100644
> --- a/drivers/net/ethernet/qlogic/qed/qed_debug.c
> +++ b/drivers/net/ethernet/qlogic/qed/qed_debug.c
> @@ -7854,6 +7854,7 @@ int qed_dbg_all_data(struct qed_dev *cdev, void *buffer)
> REGDUMP_HEADER_SIZE,
> &feature_size);
> if (!rc) {
> + module_firmware_crashed();
> *(u32 *)((u8 *)buffer + offset) =
> qed_calc_regdump_header(cdev, PROTECTION_OVERRIDE,
> cur_engine,
> @@ -7869,6 +7870,7 @@ int qed_dbg_all_data(struct qed_dev *cdev, void *buffer)
> rc = qed_dbg_fw_asserts(cdev, (u8 *)buffer + offset +
> REGDUMP_HEADER_SIZE, &feature_size);
> if (!rc) {
> + module_firmware_crashed();
> *(u32 *)((u8 *)buffer + offset) =
> qed_calc_regdump_header(cdev, FW_ASSERTS,
> cur_engine, feature_size,
> @@ -7906,6 +7908,7 @@ int qed_dbg_all_data(struct qed_dev *cdev, void *buffer)
> rc = qed_dbg_grc(cdev, (u8 *)buffer + offset +
> REGDUMP_HEADER_SIZE, &feature_size);
> if (!rc) {
> + module_firmware_crashed();
> *(u32 *)((u8 *)buffer + offset) =
> qed_calc_regdump_header(cdev, GRC_DUMP,
> cur_engine,
> diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
> index 1d941d53fdc9..6bd0f3b518b9 100644
> --- a/drivers/net/wireless/ath/ath10k/pci.c
> +++ b/drivers/net/wireless/ath/ath10k/pci.c
> @@ -1767,6 +1767,7 @@ static void ath10k_pci_fw_dump_work(struct work_struct *work)
> scnprintf(guid, sizeof(guid), "n/a");
>
> ath10k_err(ar, "firmware crashed! (guid %s)\n", guid);
> + module_firmware_crashed();
> ath10k_print_driver_info(ar);
> ath10k_pci_dump_registers(ar, crash_data);
> ath10k_ce_dump_registers(ar, crash_data);
> @@ -2837,6 +2838,7 @@ static int ath10k_pci_hif_power_up(struct ath10k *ar,
> if (ret) {
> if (ath10k_pci_has_fw_crashed(ar)) {
> ath10k_warn(ar, "firmware crashed during chip reset\n");
> + module_firmware_crashed();
> ath10k_pci_fw_crashed_clear(ar);
> ath10k_pci_fw_crashed_dump(ar);
> }
> diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
> index e2aff2254a40..d34ad289380f 100644
> --- a/drivers/net/wireless/ath/ath10k/sdio.c
> +++ b/drivers/net/wireless/ath/ath10k/sdio.c
> @@ -794,6 +794,7 @@ static int ath10k_sdio_mbox_proc_dbg_intr(struct ath10k *ar)
>
> /* TODO: Add firmware crash handling */
> ath10k_warn(ar, "firmware crashed\n");
> + module_firmware_crashed();
>
> /* read counter to clear the interrupt, the debug error interrupt is
> * counter 0.
> @@ -915,6 +916,7 @@ static int ath10k_sdio_mbox_proc_cpu_intr(struct ath10k *ar)
> if (cpu_int_status & MBOX_CPU_STATUS_ENABLE_ASSERT_MASK) {
> ath10k_err(ar, "firmware crashed!\n");
> queue_work(ar->workqueue, &ar->restart_work);
> + module_firmware_crashed();
> }
> return ret;
> }
> diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
> index 354d49b1cd45..7cfc123c345c 100644
> --- a/drivers/net/wireless/ath/ath10k/snoc.c
> +++ b/drivers/net/wireless/ath/ath10k/snoc.c
> @@ -1451,6 +1451,7 @@ void ath10k_snoc_fw_crashed_dump(struct ath10k *ar)
> scnprintf(guid, sizeof(guid), "n/a");
>
> ath10k_err(ar, "firmware crashed! (guid %s)\n", guid);
> + module_firmware_crashed();
> ath10k_print_driver_info(ar);
> ath10k_msa_dump_memory(ar, crash_data);
> mutex_unlock(&ar->dump_mutex);
> diff --git a/drivers/net/wireless/ath/ath6kl/hif.c b/drivers/net/wireless/ath/ath6kl/hif.c
> index d1942537ea10..cfd838607544 100644
> --- a/drivers/net/wireless/ath/ath6kl/hif.c
> +++ b/drivers/net/wireless/ath/ath6kl/hif.c
> @@ -120,6 +120,7 @@ static int ath6kl_hif_proc_dbg_intr(struct ath6kl_device *dev)
> int ret;
>
> ath6kl_warn("firmware crashed\n");
> + module_firmware_crashed();
>
> /*
> * read counter to clear the interrupt, the debug error interrupt is
> diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
> index 02636b4785c5..39a58ba5df0a 100644
> --- a/drivers/scsi/qla4xxx/ql4_mbx.c
> +++ b/drivers/scsi/qla4xxx/ql4_mbx.c
> @@ -1016,6 +1016,8 @@ void qla4xxx_get_crash_record(struct scsi_qla_host * ha)
> dma_addr_t crash_record_dma = 0;
> uint32_t crash_record_size = 0;
>
> + module_firmware_crashed();
> +
> memset(&mbox_cmd, 0, sizeof(mbox_cmd));
> memset(&mbox_sts, 0, sizeof(mbox_cmd));
>
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 04a5885cec1b..19e1541c82c7 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -601,7 +601,8 @@ extern enum system_states {
> #define TAINT_LIVEPATCH 15
> #define TAINT_AUX 16
> #define TAINT_RANDSTRUCT 17
> -#define TAINT_FLAGS_COUNT 18
> +#define TAINT_FIRMWARE_CRASH 18
> +#define TAINT_FLAGS_COUNT 19
>
> struct taint_flag {
> char c_true; /* character printed when tainted */
> diff --git a/include/linux/module.h b/include/linux/module.h
> index 1ad393e62bef..de9156dfe6bb 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -697,6 +697,14 @@ static inline bool is_livepatch_module(struct module *mod)
> bool is_module_sig_enforced(void);
> void set_module_sig_enforced(void);
>
> +void add_taint_module(struct module *mod, unsigned flag,
> + enum lockdep_ok lockdep_ok);
> +
> +static inline void module_firmware_crashed(void)
> +{
> + add_taint_module(THIS_MODULE, TAINT_FIRMWARE_CRASH, LOCKDEP_STILL_OK);
> +}
> +
> #else /* !CONFIG_MODULES... */
>
> static inline struct module *__module_address(unsigned long addr)
> @@ -844,6 +852,11 @@ void *dereference_module_function_descriptor(struct module *mod, void *ptr)
> return ptr;
> }
>
> +static inline void module_firmware_crashed(void)
> +{
> + add_taint(TAINT_FIRMWARE_CRASH, val);
> +}
> +
> #endif /* CONFIG_MODULES */
>
> #ifdef CONFIG_SYSFS
> diff --git a/include/trace/events/module.h b/include/trace/events/module.h
> index 097485c73c01..b749ea25affd 100644
> --- a/include/trace/events/module.h
> +++ b/include/trace/events/module.h
> @@ -26,7 +26,8 @@ struct module;
> { (1UL << TAINT_OOT_MODULE), "O" }, \
> { (1UL << TAINT_FORCED_MODULE), "F" }, \
> { (1UL << TAINT_CRAP), "C" }, \
> - { (1UL << TAINT_UNSIGNED_MODULE), "E" })
> + { (1UL << TAINT_UNSIGNED_MODULE), "E" }, \
> + { (1UL << TAINT_FIRMWARE_CRASH), "Q" })
>
> TRACE_EVENT(module_load,
>
> diff --git a/kernel/module.c b/kernel/module.c
> index d626dc31b37f..06e6e645dbd4 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -325,12 +325,13 @@ static inline int strong_try_module_get(struct module *mod)
> return -ENOENT;
> }
>
> -static inline void add_taint_module(struct module *mod, unsigned flag,
> - enum lockdep_ok lockdep_ok)
> +void add_taint_module(struct module *mod, unsigned flag,
> + enum lockdep_ok lockdep_ok)
> {
> add_taint(flag, lockdep_ok);
> set_bit(flag, &mod->taints);
> }
> +EXPORT_SYMBOL_GPL(add_taint_module);
>
> /*
> * A thread that wants to hold a reference to a module only while it
> diff --git a/kernel/panic.c b/kernel/panic.c
> index ec6d7d788ce7..504fb926947e 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -384,6 +384,7 @@ const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
> [ TAINT_LIVEPATCH ] = { 'K', ' ', true },
> [ TAINT_AUX ] = { 'X', ' ', true },
> [ TAINT_RANDSTRUCT ] = { 'T', ' ', true },
> + [ TAINT_FIRMWARE_CRASH ] = { 'Q', ' ', true },
> };
>
> /**
> --
> 2.25.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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