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Message-ID: <Zvw0SnS40Rf_jWbB@fan>
Date: Tue, 1 Oct 2024 10:41:30 -0700
From: Fan Ni <nifan.cxl@...il.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-cxl@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Dan Williams <dan.j.williams@...el.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Yazen Ghannam <yazen.ghannam@....com>,
Bowman Terry <terry.bowman@....com>
Subject: Re: [PATCH v2 3/4] acpi/ghes, efi/cper: Recognize and process CXL
Protocol Errors.
On Tue, Oct 01, 2024 at 12:52:33AM +0000, 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 Error Record and Cache Error
> Severity, Device ID, Device Serial number and CXL RAS capability struct in
> struct cxl_cper_prot_err. Include this struct as a member of struct
> cxl_cper_work_data.
>
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
> ---
> v2:
> Defined array of structures for Device ID and Serial number
> comparison.
> p_err -> rec/p_rec.
> ---
> drivers/acpi/apei/ghes.c | 10 +++
> drivers/firmware/efi/cper_cxl.c | 115 ++++++++++++++++++++++++++++++++
> include/cxl/event.h | 26 ++++++++
> 3 files changed, 151 insertions(+)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index ada93cfde9ba..9dcf0f78458f 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -717,6 +717,14 @@ static void cxl_cper_post_event(enum cxl_event_type event_type,
> schedule_work(cxl_cper_work);
> }
>
> +static void cxl_cper_handle_prot_err(struct acpi_hest_generic_data *gdata)
> +{
> + struct cxl_cper_work_data wd;
> +
> + if (cxl_cper_handle_prot_err_info(gdata, &wd.p_rec))
> + return;
> +}
Why we need a if here? It seems the function will return anyway.
Fan
> +
> int cxl_cper_register_work(struct work_struct *work)
> {
> if (cxl_cper_work)
> @@ -791,6 +799,8 @@ static bool ghes_do_proc(struct ghes *ghes,
> struct cxl_cper_event_rec *rec = acpi_hest_get_payload(gdata);
>
> cxl_cper_post_event(CXL_CPER_EVENT_MEM_MODULE, rec);
> + } else if (guid_equal(sec_type, &CPER_SEC_CXL_PROT_ERR)) {
> + cxl_cper_handle_prot_err(gdata);
> } else {
> void *err = acpi_hest_get_payload(gdata);
>
> diff --git a/drivers/firmware/efi/cper_cxl.c b/drivers/firmware/efi/cper_cxl.c
> index 4fd8d783993e..08da7764c066 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)
> @@ -44,6 +45,66 @@ enum {
> USP, /* CXL Upstream Switch Port */
> };
>
> +struct agent_info {
> + const char *string;
> + bool req_sn;
> + bool req_sbdf;
> +};
> +
> +static const struct agent_info agent_info[] = {
> + [RCD] = {
> + .string = "Restricted CXL Device",
> + .req_sbdf = true,
> + .req_sn = true,
> + },
> + [RCH_DP] = {
> + .string = "Restricted CXL Host Downstream Port",
> + .req_sbdf = false,
> + .req_sn = false,
> + },
> + [DEVICE] = {
> + .string = "CXL Device",
> + .req_sbdf = true,
> + .req_sn = true,
> + },
> + [LD] = {
> + .string = "CXL Logical Device",
> + .req_sbdf = true,
> + .req_sn = true,
> + },
> + [FMLD] = {
> + .string = "CXL Fabric Manager managed Logical Device",
> + .req_sbdf = true,
> + .req_sn = true,
> + },
> + [RP] = {
> + .string = "CXL Root Port",
> + .req_sbdf = true,
> + .req_sn = false,
> + },
> + [DSP] = {
> + .string = "CXL Downstream Switch Port",
> + .req_sbdf = true,
> + .req_sn = false,
> + },
> + [USP] = {
> + .string = "CXL Upstream Switch Port",
> + .req_sbdf = true,
> + .req_sn = false,
> + },
> +};
> +
> +static enum cxl_aer_err_type cper_severity_cxl_aer(int cper_severity)
> +{
> + switch (cper_severity) {
> + case CPER_SEV_RECOVERABLE:
> + case CPER_SEV_FATAL:
> + return CXL_AER_UNCORRECTABLE;
> + default:
> + return CXL_AER_CORRECTABLE;
> + }
> +}
> +
> void cper_print_prot_err(const char *pfx, const struct cper_sec_prot_err *prot_err)
> {
> if (prot_err->valid_bits & PROT_ERR_VALID_AGENT_TYPE)
> @@ -176,3 +237,57 @@ 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_prot_err *rec)
> +{
> + struct cper_sec_prot_err *prot_err = acpi_hest_get_payload(gdata);
> + u8 *dvsec_start, *cap_start;
> +
> + if (!(prot_err->valid_bits & PROT_ERR_VALID_DEVICE_ID)) {
> + pr_err(FW_WARN "No Device ID\n");
> + return -EINVAL;
> + }
> +
> + /*
> + * The device ID or agent address is required for CXL RCD, CXL
> + * SLD, CXL LD, CXL Fabric Manager Managed LD, CXL Root Port,
> + * CXL Downstream Switch Port and CXL Upstream Switch Port.
> + */
> + if (!(agent_info[prot_err->agent_type].req_sbdf)) {
> + pr_err(FW_WARN "Invalid agent type\n");
> + return -EINVAL;
> + }
> +
> + rec->segment = prot_err->agent_addr.segment;
> + rec->bus = prot_err->agent_addr.bus;
> + rec->device = prot_err->agent_addr.device;
> + rec->function = prot_err->agent_addr.function;
> +
> + if (!(prot_err->valid_bits & PROT_ERR_VALID_ERROR_LOG)) {
> + pr_err(FW_WARN "Invalid Protocol Error log\n");
> + return -EINVAL;
> + }
> +
> + dvsec_start = (u8 *)(prot_err + 1);
> + cap_start = dvsec_start + prot_err->dvsec_len;
> + rec->cxl_ras = *(struct cxl_ras_capability_regs *)cap_start;
> +
> + /*
> + * Set device serial number unconditionally.
> + *
> + * Print a warning message if it is not valid. The device serial
> + * number is required for CXL RCD, CXL SLD, CXL LD and CXL Fabric
> + * Manager Managed LD.
> + */
> + if (!(prot_err->valid_bits & PROT_ERR_VALID_SERIAL_NUMBER) ||
> + !(agent_info[prot_err->agent_type].req_sn))
> + pr_warn(FW_WARN "No Device Serial number\n");
> +
> + rec->lower_dw = prot_err->dev_serial_num.lower_dw;
> + rec->upper_dw = prot_err->dev_serial_num.upper_dw;
> +
> + rec->severity = cper_severity_cxl_aer(gdata->error_severity);
> +
> + return 0;
> +}
> diff --git a/include/cxl/event.h b/include/cxl/event.h
> index 57b4630568f6..5b316150556a 100644
> --- a/include/cxl/event.h
> +++ b/include/cxl/event.h
> @@ -158,11 +158,37 @@ struct cxl_ras_capability_regs {
> u32 header_log[16];
> };
>
> +enum cxl_aer_err_type {
> + CXL_AER_UNCORRECTABLE,
> + CXL_AER_CORRECTABLE,
> +};
> +
> +struct cxl_cper_prot_err {
> + struct cxl_ras_capability_regs cxl_ras;
> +
> + /* Device ID */
> + u8 function;
> + u8 device;
> + u8 bus;
> + u16 segment;
> +
> + /* Device Serial Number */
> + u32 lower_dw;
> + u32 upper_dw;
> +
> + int severity;
> +};
> +
> struct cxl_cper_work_data {
> enum cxl_event_type event_type;
> struct cxl_cper_event_rec rec;
> + struct cxl_cper_prot_err p_rec;
> };
>
> +struct acpi_hest_generic_data;
> +int cxl_cper_handle_prot_err_info(struct acpi_hest_generic_data *gdata,
> + struct cxl_cper_prot_err *rec);
> +
> #ifdef CONFIG_ACPI_APEI_GHES
> int cxl_cper_register_work(struct work_struct *work);
> int cxl_cper_unregister_work(struct work_struct *work);
> --
> 2.17.1
>
--
Fan Ni
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