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Date: Wed, 22 May 2024 15:08:38 +0000
From: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To: <linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-cxl@...r.kernel.org>
CC: 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: [PATCH 3/4] acpi/ghes, cxl/pci: Trace FW-First CXL Protocol Errors
When PCIe AER is in FW-First, OS should process CXL Protocol errors from
CPER records.
Reuse the existing work queue cxl_cper_work registered with GHES to notify
the CXL subsystem on a Protocol error.
The defined trace events cxl_aer_uncorrectable_error and
cxl_aer_correctable_error currently trace native CXL AER errors. Reuse
them to trace FW-First Protocol Errors.
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
---
drivers/acpi/apei/ghes.c | 14 ++++++++++++++
drivers/cxl/core/pci.c | 24 ++++++++++++++++++++++++
drivers/cxl/cxlpci.h | 3 +++
drivers/cxl/pci.c | 34 ++++++++++++++++++++++++++++++++--
include/linux/cxl-event.h | 1 +
5 files changed, 74 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 1a58032770ee..a31bd91e9475 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -723,6 +723,20 @@ static void cxl_cper_handle_prot_err(struct acpi_hest_generic_data *gdata)
if (cxl_cper_handle_prot_err_info(gdata, &wd.p_err))
return;
+
+ guard(spinlock_irqsave)(&cxl_cper_work_lock);
+
+ if (!cxl_cper_work)
+ return;
+
+ wd.event_type = CXL_CPER_EVENT_PROT_ERR;
+
+ if (!kfifo_put(&cxl_cper_fifo, wd)) {
+ pr_err_ratelimited("CXL CPER kfifo overflow\n");
+ return;
+ }
+
+ schedule_work(cxl_cper_work);
}
int cxl_cper_register_work(struct work_struct *work)
diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 0df09bd79408..ef9438cb1dd6 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -686,6 +686,30 @@ void read_cdat_data(struct cxl_port *port)
}
EXPORT_SYMBOL_NS_GPL(read_cdat_data, CXL);
+void cxl_trace_prot_err(struct cxl_dev_state *cxlds,
+ struct cxl_cper_prot_err *p_err)
+{
+ u32 status, fe;
+
+ if (p_err->severity == CXL_AER_CORRECTABLE) {
+ status = p_err->cxl_ras.cor_status & ~p_err->cxl_ras.cor_mask;
+
+ trace_cxl_aer_correctable_error(cxlds->cxlmd, status);
+ } else {
+ status = p_err->cxl_ras.uncor_status & ~p_err->cxl_ras.uncor_mask;
+
+ if (hweight32(status) > 1)
+ fe = BIT(FIELD_GET(CXL_RAS_CAP_CONTROL_FE_MASK,
+ p_err->cxl_ras.cap_control));
+ else
+ fe = status;
+
+ trace_cxl_aer_uncorrectable_error(cxlds->cxlmd, status, fe,
+ p_err->cxl_ras.header_log);
+ }
+}
+EXPORT_SYMBOL_NS_GPL(cxl_trace_prot_err, CXL);
+
static void __cxl_handle_cor_ras(struct cxl_dev_state *cxlds,
void __iomem *ras_base)
{
diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h
index 93992a1c8eec..0ba3215786e1 100644
--- a/drivers/cxl/cxlpci.h
+++ b/drivers/cxl/cxlpci.h
@@ -130,4 +130,7 @@ void read_cdat_data(struct cxl_port *port);
void cxl_cor_error_detected(struct pci_dev *pdev);
pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
pci_channel_state_t state);
+struct cxl_cper_prot_err;
+void cxl_trace_prot_err(struct cxl_dev_state *cxlds,
+ struct cxl_cper_prot_err *p_err);
#endif /* __CXL_PCI_H__ */
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 74876c9835e8..3e3c36983686 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -1011,12 +1011,42 @@ static void cxl_handle_cper_event(enum cxl_event_type ev_type,
&uuid_null, &rec->event);
}
+static void cxl_handle_prot_err(struct cxl_cper_prot_err *p_err)
+{
+ struct pci_dev *pdev __free(pci_dev_put) = NULL;
+ struct cxl_dev_state *cxlds;
+ unsigned int devfn;
+
+ devfn = PCI_DEVFN(p_err->device, p_err->function);
+ pdev = pci_get_domain_bus_and_slot(p_err->segment,
+ p_err->bus, devfn);
+ if (!pdev)
+ return;
+
+ guard(device)(&pdev->dev);
+ if (pdev->driver != &cxl_pci_driver)
+ return;
+
+ cxlds = pci_get_drvdata(pdev);
+ if (!cxlds)
+ return;
+
+ if (((u64)p_err->upper_dw << 32 | p_err->lower_dw) != cxlds->serial)
+ pr_warn("CPER-reported device serial number does not match expected value\n");
+
+ cxl_trace_prot_err(cxlds, p_err);
+}
+
static void cxl_cper_work_fn(struct work_struct *work)
{
struct cxl_cper_work_data wd;
- while (cxl_cper_kfifo_get(&wd))
- cxl_handle_cper_event(wd.event_type, &wd.rec);
+ while (cxl_cper_kfifo_get(&wd)) {
+ if (wd.event_type == CXL_CPER_EVENT_PROT_ERR)
+ cxl_handle_prot_err(&wd.p_err);
+ else
+ cxl_handle_cper_event(wd.event_type, &wd.rec);
+ }
}
static DECLARE_WORK(cxl_cper_work, cxl_cper_work_fn);
diff --git a/include/linux/cxl-event.h b/include/linux/cxl-event.h
index 9c7b69e076a0..5562844df850 100644
--- a/include/linux/cxl-event.h
+++ b/include/linux/cxl-event.h
@@ -122,6 +122,7 @@ struct cxl_event_record_raw {
} __packed;
enum cxl_event_type {
+ CXL_CPER_EVENT_PROT_ERR,
CXL_CPER_EVENT_GENERIC,
CXL_CPER_EVENT_GEN_MEDIA,
CXL_CPER_EVENT_DRAM,
--
2.17.1
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