| Message ID | 20240102150933.161009-4-Smita.KoralahalliChannabasappa@amd.com |
|---|---|
| State | New |
| Headers | show |
| Series | acpi/ghes, cper, cxl: Trace FW-First CXL Protocol Errors | expand |
On 1/2/2024 9:58 AM, Ira Weiny wrote: > Smita Koralahalli wrote: >> UEFI v2.10 section N.2.13 defines a CPER record for CXL Protocol errors. >> >> Add GHES support to detect CXL CPER Protocol record and cache error >> severity, device_id, serial number and a pointer to CXL RAS capability >> struct in struct cxl_cper_rec_data. >> >> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> >> --- >> drivers/acpi/apei/ghes.c | 15 ++++++++++ >> drivers/firmware/efi/cper_cxl.c | 52 +++++++++++++++++++++++++++++++++ >> include/linux/cxl-event.h | 6 ++++ >> 3 files changed, 73 insertions(+) >> >> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c >> index d6a85fbc0a8b..6471584b2e79 100644 >> --- a/drivers/acpi/apei/ghes.c >> +++ b/drivers/acpi/apei/ghes.c >> @@ -714,6 +714,18 @@ static void cxl_cper_post_event(enum cxl_event_type event_type, >> cper_callback(event_type, &data); >> } >> >> +void cxl_cper_handle_prot_err(struct acpi_hest_generic_data *gdata) >> +{ >> + struct cxl_cper_rec_data data; >> + >> + memset(&data, 0, sizeof(data)); > > Does this need to be done? Could cxl_cper_handle_prot_err_info() use > something like this initially? > > *data = (struct cxl_cper_rec_data) { > .rec.hdr.dev_serial_num.lower_dw = prot_err->dev_serial_num.lower_dw; > .rec.hdr.dev_serial_num.upper_dw = prot_err->dev_serial_num.upper_dw; > }; > > The serial number is always set even if it is not valid. Ok will copy serial number at the beginning of cxl_cper_handle_prot_err_info() and remove memset. > >> + >> + if (cxl_cper_handle_prot_err_info(gdata, &data)) >> + return; >> + >> + data.severity = gdata->error_severity; >> +} >> + >> int cxl_cper_register_callback(cxl_cper_callback callback) >> { >> guard(rwsem_write)(&cxl_cper_rw_sem); >> @@ -768,6 +780,9 @@ static bool ghes_do_proc(struct ghes *ghes, >> else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) { >> queued = ghes_handle_arm_hw_error(gdata, sev); >> } >> + else if (guid_equal(sec_type, &CPER_SEC_CXL_PROT_ERR)) { >> + cxl_cper_handle_prot_err(gdata); >> + } >> else if (guid_equal(sec_type, &CPER_SEC_CXL_GEN_MEDIA_GUID)) { >> struct cxl_cper_event_rec *rec = acpi_hest_get_payload(gdata); >> >> diff --git a/drivers/firmware/efi/cper_cxl.c b/drivers/firmware/efi/cper_cxl.c >> index 4fd8d783993e..3bc0b9f28c9e 100644 >> --- a/drivers/firmware/efi/cper_cxl.c >> +++ b/drivers/firmware/efi/cper_cxl.c >> @@ -8,6 +8,7 @@ >> */ >> >> #include <linux/cper.h> >> +#include <acpi/ghes.h> >> #include "cper_cxl.h" >> >> #define PROT_ERR_VALID_AGENT_TYPE BIT_ULL(0) >> @@ -176,3 +177,54 @@ void cper_print_prot_err(const char *pfx, const struct cper_sec_prot_err *prot_e >> sizeof(cxl_ras->header_log), 0); >> } >> } >> + >> +int cxl_cper_handle_prot_err_info(struct acpi_hest_generic_data *gdata, >> + struct cxl_cper_rec_data *data) >> +{ >> + struct cper_sec_prot_err *prot_err = acpi_hest_get_payload(gdata); >> + struct cper_cxl_event_devid *device_id = &data->rec.hdr.device_id; >> + struct cper_cxl_event_sn *dev_serial_num = &data->rec.hdr.dev_serial_num; >> + size_t size = sizeof(*prot_err) + prot_err->dvsec_len; >> + >> + if (!(prot_err->valid_bits & PROT_ERR_VALID_ERROR_LOG)) { >> + pr_err(FW_WARN "Not a valid protocol error log\n"); >> + return -EINVAL; >> + } >> + >> + if (!(prot_err->valid_bits & PROT_ERR_VALID_DEVICE_ID)) { >> + pr_err(FW_WARN "Not a valid Device ID\n"); >> + return -EINVAL; >> + } >> + >> + /* >> + * The device ID or agent address is only valid for CXL 1.1 device, >> + * CXL 2.0 device, CXL 2.0 Logical device, CXL 2.0 Fabric Manager >> + * Managed Logical Device, CXL Root Port, CXL Downstream Switch >> + * Port, or CXL Upstream Switch Port. >> + */ >> + if (prot_err->agent_type <= 0x7 && prot_err->agent_type != RCH_DP) { >> + device_id->segment_num = prot_err->agent_addr.segment; >> + device_id->bus_num = prot_err->agent_addr.bus; >> + device_id->device_num = prot_err->agent_addr.device; >> + device_id->func_num = prot_err->agent_addr.function; >> + } else { >> + pr_err(FW_WARN "Not a valid agent type\n"); >> + return -EINVAL; >> + } >> + >> + /* >> + * The device serial number is only valid for CXL 1.1 device, CXL >> + * 2.0 device, CXL 2.0 Logical device, or CXL 2.0 Fabric Manager >> + * Managed Logical Device. >> + */ >> + if (!(prot_err->valid_bits & PROT_ERR_VALID_SERIAL_NUMBER) || >> + prot_err->agent_type > 0x4 || prot_err->agent_type == RCH_DP) >> + pr_warn(FW_WARN "No valid serial number present\n"); >> + >> + dev_serial_num->lower_dw = prot_err->dev_serial_num.lower_dw; >> + dev_serial_num->upper_dw = prot_err->dev_serial_num.upper_dw; >> + >> + data->cxl_ras = (struct cxl_ras_capability_regs *)((long)prot_err + size); > > I think this is ok now because the cxl trace code processes the data > before returning (in next patch). But I'm a bit leary about passing a > pointer to data controlled by the acpi sub-system. At some point the > event may get cached to be processed by another thread and it might be > better to copy the struct here. Ok will make the changes. Rewrote the struct in patch 1. > >> + >> + return 0; >> +} >> diff --git a/include/linux/cxl-event.h b/include/linux/cxl-event.h >> index 90d8390a73cb..7ba2dfd6619e 100644 >> --- a/include/linux/cxl-event.h >> +++ b/include/linux/cxl-event.h >> @@ -154,11 +154,17 @@ struct cxl_ras_capability_regs { >> >> struct cxl_cper_rec_data { >> struct cxl_cper_event_rec rec; >> + struct cxl_ras_capability_regs *cxl_ras; >> + int severity; > > NIT: When I saw this without any addition to event type I wondered if the > series would bisect. I see it does because the record is not sent until > the next patch. But I wonder if the 2 patches would be best reversed. You mean to say patch 4 to be 3 and 3 to be 4? And since I haven't used severity yet, fix it by declaring severity to where it is used.. > > Also, should cxl_ras + severity be put in a protocol error sub-struct? > Does severity ever apply to event records? No, not in any of the component event records. Only place is in "Event Record Flags" in Common Event Record Format (Table 8-42). Addressed in patch 1 to make a sub-struct. Thanks, Smita > > Ira > >> }; >> >> typedef void (*cxl_cper_callback)(enum cxl_event_type type, >> struct cxl_cper_rec_data *data); >> >> +struct acpi_hest_generic_data; >> +int cxl_cper_handle_prot_err_info(struct acpi_hest_generic_data *gdata, >> + struct cxl_cper_rec_data *data); >> + >> #ifdef CONFIG_ACPI_APEI_GHES >> int cxl_cper_register_callback(cxl_cper_callback callback); >> int cxl_cper_unregister_callback(cxl_cper_callback callback); >> -- >> 2.17.1 >> > >
Smita Koralahalli wrote: > On 1/2/2024 9:58 AM, Ira Weiny wrote: > > Smita Koralahalli wrote: [snip] > >> + > >> + return 0; > >> +} > >> diff --git a/include/linux/cxl-event.h b/include/linux/cxl-event.h > >> index 90d8390a73cb..7ba2dfd6619e 100644 > >> --- a/include/linux/cxl-event.h > >> +++ b/include/linux/cxl-event.h > >> @@ -154,11 +154,17 @@ struct cxl_ras_capability_regs { > >> > >> struct cxl_cper_rec_data { > >> struct cxl_cper_event_rec rec; > >> + struct cxl_ras_capability_regs *cxl_ras; > >> + int severity; > > > > NIT: When I saw this without any addition to event type I wondered if the > > series would bisect. I see it does because the record is not sent until > > the next patch. But I wonder if the 2 patches would be best reversed. > > You mean to say patch 4 to be 3 and 3 to be 4? > > And since I haven't used severity yet, fix it by declaring severity to > where it is used.. Yes. What you have is not technically wrong but it threw me in review. > > > > > Also, should cxl_ras + severity be put in a protocol error sub-struct? > > Does severity ever apply to event records? > > No, not in any of the component event records. Only place is in "Event > Record Flags" in Common Event Record Format (Table 8-42). > > Addressed in patch 1 to make a sub-struct. Thanks! Ira
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index d6a85fbc0a8b..6471584b2e79 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -714,6 +714,18 @@ static void cxl_cper_post_event(enum cxl_event_type event_type, cper_callback(event_type, &data); } +void cxl_cper_handle_prot_err(struct acpi_hest_generic_data *gdata) +{ + struct cxl_cper_rec_data data; + + memset(&data, 0, sizeof(data)); + + if (cxl_cper_handle_prot_err_info(gdata, &data)) + return; + + data.severity = gdata->error_severity; +} + int cxl_cper_register_callback(cxl_cper_callback callback) { guard(rwsem_write)(&cxl_cper_rw_sem); @@ -768,6 +780,9 @@ static bool ghes_do_proc(struct ghes *ghes, else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) { queued = ghes_handle_arm_hw_error(gdata, sev); } + else if (guid_equal(sec_type, &CPER_SEC_CXL_PROT_ERR)) { + cxl_cper_handle_prot_err(gdata); + } else if (guid_equal(sec_type, &CPER_SEC_CXL_GEN_MEDIA_GUID)) { struct cxl_cper_event_rec *rec = acpi_hest_get_payload(gdata); diff --git a/drivers/firmware/efi/cper_cxl.c b/drivers/firmware/efi/cper_cxl.c index 4fd8d783993e..3bc0b9f28c9e 100644 --- a/drivers/firmware/efi/cper_cxl.c +++ b/drivers/firmware/efi/cper_cxl.c @@ -8,6 +8,7 @@ */ #include <linux/cper.h> +#include <acpi/ghes.h> #include "cper_cxl.h" #define PROT_ERR_VALID_AGENT_TYPE BIT_ULL(0) @@ -176,3 +177,54 @@ void cper_print_prot_err(const char *pfx, const struct cper_sec_prot_err *prot_e sizeof(cxl_ras->header_log), 0); } } + +int cxl_cper_handle_prot_err_info(struct acpi_hest_generic_data *gdata, + struct cxl_cper_rec_data *data) +{ + struct cper_sec_prot_err *prot_err = acpi_hest_get_payload(gdata); + struct cper_cxl_event_devid *device_id = &data->rec.hdr.device_id; + struct cper_cxl_event_sn *dev_serial_num = &data->rec.hdr.dev_serial_num; + size_t size = sizeof(*prot_err) + prot_err->dvsec_len; + + if (!(prot_err->valid_bits & PROT_ERR_VALID_ERROR_LOG)) { + pr_err(FW_WARN "Not a valid protocol error log\n"); + return -EINVAL; + } + + if (!(prot_err->valid_bits & PROT_ERR_VALID_DEVICE_ID)) { + pr_err(FW_WARN "Not a valid Device ID\n"); + return -EINVAL; + } + + /* + * The device ID or agent address is only valid for CXL 1.1 device, + * CXL 2.0 device, CXL 2.0 Logical device, CXL 2.0 Fabric Manager + * Managed Logical Device, CXL Root Port, CXL Downstream Switch + * Port, or CXL Upstream Switch Port. + */ + if (prot_err->agent_type <= 0x7 && prot_err->agent_type != RCH_DP) { + device_id->segment_num = prot_err->agent_addr.segment; + device_id->bus_num = prot_err->agent_addr.bus; + device_id->device_num = prot_err->agent_addr.device; + device_id->func_num = prot_err->agent_addr.function; + } else { + pr_err(FW_WARN "Not a valid agent type\n"); + return -EINVAL; + } + + /* + * The device serial number is only valid for CXL 1.1 device, CXL + * 2.0 device, CXL 2.0 Logical device, or CXL 2.0 Fabric Manager + * Managed Logical Device. + */ + if (!(prot_err->valid_bits & PROT_ERR_VALID_SERIAL_NUMBER) || + prot_err->agent_type > 0x4 || prot_err->agent_type == RCH_DP) + pr_warn(FW_WARN "No valid serial number present\n"); + + dev_serial_num->lower_dw = prot_err->dev_serial_num.lower_dw; + dev_serial_num->upper_dw = prot_err->dev_serial_num.upper_dw; + + data->cxl_ras = (struct cxl_ras_capability_regs *)((long)prot_err + size); + + return 0; +} diff --git a/include/linux/cxl-event.h b/include/linux/cxl-event.h index 90d8390a73cb..7ba2dfd6619e 100644 --- a/include/linux/cxl-event.h +++ b/include/linux/cxl-event.h @@ -154,11 +154,17 @@ struct cxl_ras_capability_regs { struct cxl_cper_rec_data { struct cxl_cper_event_rec rec; + struct cxl_ras_capability_regs *cxl_ras; + int severity; }; typedef void (*cxl_cper_callback)(enum cxl_event_type type, struct cxl_cper_rec_data *data); +struct acpi_hest_generic_data; +int cxl_cper_handle_prot_err_info(struct acpi_hest_generic_data *gdata, + struct cxl_cper_rec_data *data); + #ifdef CONFIG_ACPI_APEI_GHES int cxl_cper_register_callback(cxl_cper_callback callback); int cxl_cper_unregister_callback(cxl_cper_callback callback);
UEFI v2.10 section N.2.13 defines a CPER record for CXL Protocol errors. Add GHES support to detect CXL CPER Protocol record and cache error severity, device_id, serial number and a pointer to CXL RAS capability struct in struct cxl_cper_rec_data. Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> --- drivers/acpi/apei/ghes.c | 15 ++++++++++ drivers/firmware/efi/cper_cxl.c | 52 +++++++++++++++++++++++++++++++++ include/linux/cxl-event.h | 6 ++++ 3 files changed, 73 insertions(+)