Re: [PATCH v2] RAS: Report ARM processor information to userspace

From: Mark Rutland
Date: Tue Feb 01 2022 - 13:33:08 EST

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On Wed, Jan 26, 2022 at 11:09:06AM +0800, lostway@xxxxxxxxxx wrote:
> From: Shengwei Luo <luoshengwei@xxxxxxxxxx>
>
> The ARM processor error section includes several ARM processor error
> information, several ARM processor context information and several
> vendor specific error information structures. In addition to these
> info, there are error severity and cpu logical index about the event.
> Report all of these information to userspace via perf i/f.
>
> Original-Author: Jason Tian <jason@xxxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Shengwei Luo <luoshengwei@xxxxxxxxxx>

In addition to Boris's comments, "Original-Author" is not a proper tag, and so
this patch cannot be accepted as-is.

Please see:

https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin

Either:

* The original patch had a "Signed-off-by" tag, which you should have kept
as-is, and added your own.

* The original patch did not have a "Signed-off-by" tag, and we cannot accept
the patch.

It would be good to provide a link to the prior patch, ideally via
lore.kernel.org. For reference, this patch is:

https://lore.kernel.org/lkml/20220126030906.56765-1-lostway@xxxxxxxxxx/

It would also be good to Cc the relevant arm maintainers here (e.g James
Morse), since they're more likely to know about the arm side of things...

Thanks,
Mark.

> ---
> v1->v2: Cleaned up ci warnings
> ---
> drivers/acpi/apei/ghes.c | 3 +--
> drivers/ras/ras.c | 46 ++++++++++++++++++++++++++++++++++++--
> include/linux/ras.h | 15 +++++++++++--
> include/ras/ras_event.h | 48 +++++++++++++++++++++++++++++++++++-----
> 4 files changed, 101 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 0c5c9acc6254..f824c26057b1 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -490,9 +490,8 @@ static bool ghes_handle_arm_hw_error(struct acpi_hest_generic_data *gdata, int s
> int sec_sev, i;
> char *p;
>
> - log_arm_hw_error(err);
> -
> sec_sev = ghes_severity(gdata->error_severity);
> + log_arm_hw_error(err, sec_sev);
> if (sev != GHES_SEV_RECOVERABLE || sec_sev != GHES_SEV_RECOVERABLE)
> return false;
>
> diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
> index 95540ea8dd9d..2a7f424d59b9 100644
> --- a/drivers/ras/ras.c
> +++ b/drivers/ras/ras.c
> @@ -21,9 +21,51 @@ void log_non_standard_event(const guid_t *sec_type, const guid_t *fru_id,
> trace_non_standard_event(sec_type, fru_id, fru_text, sev, err, len);
> }
>
> -void log_arm_hw_error(struct cper_sec_proc_arm *err)
> +void log_arm_hw_error(struct cper_sec_proc_arm *err, const u8 sev)
> {
> - trace_arm_event(err);
> + u32 pei_len;
> + u32 ctx_len = 0;
> + s32 vsei_len;
> + u8 *pei_err;
> + u8 *ctx_err;
> + u8 *ven_err_data;
> + struct cper_arm_err_info *err_info;
> + struct cper_arm_ctx_info *ctx_info;
> + int n, sz;
> + int cpu;
> +
> + pei_len = sizeof(struct cper_arm_err_info) * err->err_info_num;
> + pei_err = (u8 *)err + sizeof(struct cper_sec_proc_arm);
> +
> + err_info = (struct cper_arm_err_info *)(err + 1);
> + ctx_info = (struct cper_arm_ctx_info *)(err_info + err->err_info_num);
> + ctx_err = (u8 *)ctx_info;
> + for (n = 0; n < err->context_info_num; n++) {
> + sz = sizeof(struct cper_arm_ctx_info) + ctx_info->size;
> + ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + sz);
> + ctx_len += sz;
> + }
> +
> + vsei_len = err->section_length - (sizeof(struct cper_sec_proc_arm) +
> + pei_len + ctx_len);
> + if (vsei_len < 0) {
> + pr_warn(FW_BUG
> + "section length: %d\n", err->section_length);
> + pr_warn(FW_BUG
> + "section length is too small\n");
> + pr_warn(FW_BUG
> + "firmware-generated error record is incorrect\n");
> + vsei_len = 0;
> + }
> + ven_err_data = (u8 *)ctx_info;
> +
> + cpu = GET_LOGICAL_INDEX(err->mpidr);
> + /* when return value is invalid, set cpu index to -1 */
> + if (cpu < 0)
> + cpu = -1;
> +
> + trace_arm_event(err, pei_err, pei_len, ctx_err, ctx_len,
> + ven_err_data, (u32)vsei_len, sev, cpu);
> }
>
> static int __init ras_init(void)
> diff --git a/include/linux/ras.h b/include/linux/ras.h
> index 1f4048bf2674..4529775374d0 100644
> --- a/include/linux/ras.h
> +++ b/include/linux/ras.h
> @@ -24,7 +24,7 @@ int __init parse_cec_param(char *str);
> void log_non_standard_event(const guid_t *sec_type,
> const guid_t *fru_id, const char *fru_text,
> const u8 sev, const u8 *err, const u32 len);
> -void log_arm_hw_error(struct cper_sec_proc_arm *err);
> +void log_arm_hw_error(struct cper_sec_proc_arm *err, const u8 sev);
> #else
> static inline void
> log_non_standard_event(const guid_t *sec_type,
> @@ -32,7 +32,18 @@ log_non_standard_event(const guid_t *sec_type,
> const u8 sev, const u8 *err, const u32 len)
> { return; }
> static inline void
> -log_arm_hw_error(struct cper_sec_proc_arm *err) { return; }
> +log_arm_hw_error(struct cper_sec_proc_arm *err, const u8 sev) { return; }
> #endif
>
> +#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
> +#include <asm/smp_plat.h>
> +/*
> + * Include ARM specific SMP header which provides a function mapping mpidr to
> + * cpu logical index.
> + */
> +#define GET_LOGICAL_INDEX(mpidr) get_logical_index(mpidr & MPIDR_HWID_BITMASK)
> +#else
> +#define GET_LOGICAL_INDEX(mpidr) -EINVAL
> +#endif /* CONFIG_ARM || CONFIG_ARM64 */
> +
> #endif /* __RAS_H__ */
> diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
> index d0337a41141c..92cfb61bdb20 100644
> --- a/include/ras/ras_event.h
> +++ b/include/ras/ras_event.h
> @@ -168,11 +168,24 @@ TRACE_EVENT(mc_event,
> * This event is generated when hardware detects an ARM processor error
> * has occurred. UEFI 2.6 spec section N.2.4.4.
> */
> +#define APEIL "ARM Processor Err Info data len"
> +#define APEID "ARM Processor Err Info raw data"
> +#define APECIL "ARM Processor Err Context Info data len"
> +#define APECID "ARM Processor Err Context Info raw data"
> +#define VSEIL "Vendor Specific Err Info data len"
> +#define VSEID "Vendor Specific Err Info raw data"
> TRACE_EVENT(arm_event,
>
> - TP_PROTO(const struct cper_sec_proc_arm *proc),
> + TP_PROTO(const struct cper_sec_proc_arm *proc, const u8 *pei_err,
> + const u32 pei_len,
> + const u8 *ctx_err,
> + const u32 ctx_len,
> + const u8 *oem,
> + const u32 oem_len,
> + u8 sev,
> + int cpu),
>
> - TP_ARGS(proc),
> + TP_ARGS(proc, pei_err, pei_len, ctx_err, ctx_len, oem, oem_len, sev, cpu),
>
> TP_STRUCT__entry(
> __field(u64, mpidr)
> @@ -180,6 +193,14 @@ TRACE_EVENT(arm_event,
> __field(u32, running_state)
> __field(u32, psci_state)
> __field(u8, affinity)
> + __field(u32, pei_len)
> + __dynamic_array(u8, buf, pei_len)
> + __field(u32, ctx_len)
> + __dynamic_array(u8, buf1, ctx_len)
> + __field(u32, oem_len)
> + __dynamic_array(u8, buf2, oem_len)
> + __field(u8, sev)
> + __field(int, cpu)
> ),
>
> TP_fast_assign(
> @@ -199,12 +220,29 @@ TRACE_EVENT(arm_event,
> __entry->running_state = ~0;
> __entry->psci_state = ~0;
> }
> + __entry->pei_len = pei_len;
> + memcpy(__get_dynamic_array(buf), pei_err, pei_len);
> + __entry->ctx_len = ctx_len;
> + memcpy(__get_dynamic_array(buf1), ctx_err, ctx_len);
> + __entry->oem_len = oem_len;
> + memcpy(__get_dynamic_array(buf2), oem, oem_len);
> + __entry->sev = sev;
> + __entry->cpu = cpu;
> ),
>
> - TP_printk("affinity level: %d; MPIDR: %016llx; MIDR: %016llx; "
> - "running state: %d; PSCI state: %d",
> + TP_printk("cpu: %d; error: %d; affinity level: %d; MPIDR: %016llx; MIDR: %016llx; "
> + "running state: %d; PSCI state: %d; "
> + "%s: %d; %s: %s; %s: %d; %s: %s; %s: %d; %s: %s",
> + __entry->cpu,
> + __entry->sev,
> __entry->affinity, __entry->mpidr, __entry->midr,
> - __entry->running_state, __entry->psci_state)
> + __entry->running_state, __entry->psci_state,
> + APEIL, __entry->pei_len, APEID,
> + __print_hex(__get_dynamic_array(buf), __entry->pei_len),
> + APECIL, __entry->ctx_len, APECID,
> + __print_hex(__get_dynamic_array(buf1), __entry->ctx_len),
> + VSEIL, __entry->oem_len, VSEID,
> + __print_hex(__get_dynamic_array(buf2), __entry->oem_len))
> );
>
> /*
> --
> 2.27.0
>

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