RE: [PATCH v10 03/17] PCI/AER: Report CXL or PCIe bus error type in trace logging

From: Shiju Jose
Date: Fri Jun 27 2025 - 07:32:27 EST

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>-----Original Message-----
>From: Terry Bowman <terry.bowman@xxxxxxx>
>Sent: 26 June 2025 23:43
>To: dave@xxxxxxxxxxxx; Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>;
>dave.jiang@xxxxxxxxx; alison.schofield@xxxxxxxxx; dan.j.williams@xxxxxxxxx;
>bhelgaas@xxxxxxxxxx; Shiju Jose <shiju.jose@xxxxxxxxxx>;
>ming.li@xxxxxxxxxxxx; Smita.KoralahalliChannabasappa@xxxxxxx;
>rrichter@xxxxxxx; dan.carpenter@xxxxxxxxxx;
>PradeepVineshReddy.Kodamati@xxxxxxx; lukas@xxxxxxxxx;
>Benjamin.Cheatham@xxxxxxx;
>sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx; terry.bowman@xxxxxxx;
>linux-cxl@xxxxxxxxxxxxxxx
>Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx
>Subject: [PATCH v10 03/17] PCI/AER: Report CXL or PCIe bus error type in trace
>logging
>
>The AER service driver and aer_event tracing currently log 'PCIe Bus Type'
>for all errors. Update the driver and aer_event tracing to log 'CXL Bus Type' for
>CXL device errors.
>
>This requires the AER can identify and distinguish between PCIe errors and CXL
>errors.
>
>Introduce boolean 'is_cxl' to 'struct aer_err_info'. Add assignment in
>aer_get_device_error_info() and pci_print_aer().
>
>Update the aer_event trace routine to accept a bus type string parameter.
>
>Signed-off-by: Terry Bowman <terry.bowman@xxxxxxx>
>Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>
>---
> drivers/pci/pci.h | 6 ++++++
> drivers/pci/pcie/aer.c | 21 +++++++++++++++------ include/ras/ras_event.h | 9
>++++++---
> 3 files changed, 27 insertions(+), 9 deletions(-)
>
>diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index
>12215ee72afb..a0d1e59b5666 100644
>--- a/drivers/pci/pci.h
>+++ b/drivers/pci/pci.h
>@@ -608,6 +608,7 @@ struct aer_err_info {
> int ratelimit_print[AER_MAX_MULTI_ERR_DEVICES];
> int error_dev_num;
> const char *level; /* printk level */
>+ bool is_cxl;
>
> unsigned int id:16;
>
>@@ -628,6 +629,11 @@ struct aer_err_info { int
>aer_get_device_error_info(struct aer_err_info *info, int i); void
>aer_print_error(struct aer_err_info *info, int i);
>
>+static inline const char *aer_err_bus(struct aer_err_info *info) {
>+ return info->is_cxl ? "CXL" : "PCIe";
>+}
>+
> int pcie_read_tlp_log(struct pci_dev *dev, int where, int where2,
> unsigned int tlp_len, bool flit,
> struct pcie_tlp_log *log);
>diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index
>70ac66188367..a2df9456595a 100644
>--- a/drivers/pci/pcie/aer.c
>+++ b/drivers/pci/pcie/aer.c
>@@ -837,6 +837,7 @@ void aer_print_error(struct aer_err_info *info, int i)
> struct pci_dev *dev;
> int layer, agent, id;
> const char *level = info->level;
>+ const char *bus_type = aer_err_bus(info);
>
> if (WARN_ON_ONCE(i >= AER_MAX_MULTI_ERR_DEVICES))
> return;
>@@ -845,23 +846,23 @@ void aer_print_error(struct aer_err_info *info, int i)
> id = pci_dev_id(dev);
>
> pci_dev_aer_stats_incr(dev, info);
>- trace_aer_event(pci_name(dev), (info->status & ~info->mask),
>+ trace_aer_event(pci_name(dev), bus_type, (info->status & ~info->mask),
> info->severity, info->tlp_header_valid, &info->tlp);
>
> if (!info->ratelimit_print[i])
> return;
>
> if (!info->status) {
>- pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible,
>(Unregistered Agent ID)\n",
>- aer_error_severity_string[info->severity]);
>+ pci_err(dev, "%s Bus Error: severity=%s, type=Inaccessible,
>(Unregistered Agent ID)\n",
>+ bus_type, aer_error_severity_string[info->severity]);
> goto out;
> }
>
> layer = AER_GET_LAYER_ERROR(info->severity, info->status);
> agent = AER_GET_AGENT(info->severity, info->status);
>
>- aer_printk(level, dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
>- aer_error_severity_string[info->severity],
>+ aer_printk(level, dev, "%s Bus Error: severity=%s, type=%s, (%s)\n",
>+ bus_type, aer_error_severity_string[info->severity],
> aer_error_layer[layer], aer_agent_string[agent]);
>
> aer_printk(level, dev, " device [%04x:%04x] error
>status/mask=%08x/%08x\n", @@ -895,6 +896,7 @@
>EXPORT_SYMBOL_GPL(cper_severity_to_aer);
> void pci_print_aer(struct pci_dev *dev, int aer_severity,
> struct aer_capability_regs *aer)
> {
>+ const char *bus_type;
> int layer, agent, tlp_header_valid = 0;
> u32 status, mask;
> struct aer_err_info info = {
>@@ -915,9 +917,12 @@ void pci_print_aer(struct pci_dev *dev, int
>aer_severity,
>
> info.status = status;
> info.mask = mask;
>+ info.is_cxl = pcie_is_cxl(dev);
>+
>+ bus_type = aer_err_bus(&info);
>
> pci_dev_aer_stats_incr(dev, &info);
>- trace_aer_event(pci_name(dev), (status & ~mask),
>+ trace_aer_event(pci_name(dev), bus_type, (status & ~mask),
> aer_severity, tlp_header_valid, &aer->header_log);
>
> if (!aer_ratelimit(dev, info.severity)) @@ -939,6 +944,9 @@ void
>pci_print_aer(struct pci_dev *dev, int aer_severity,
> if (tlp_header_valid)
> pcie_print_tlp_log(dev, &aer->header_log, info.level,
> dev_fmt(" "));
>+
>+ trace_aer_event(dev_name(&dev->dev), bus_type, (status & ~mask),
>+ aer_severity, tlp_header_valid, &aer->header_log);
Hi Terry,

It looks like an extra trace_aer_event() is called here along with the above
trace_aer_event(pci_name(dev),...?

Thanks,
Shiju
> }
> EXPORT_SYMBOL_NS_GPL(pci_print_aer, "CXL");
>
>@@ -1371,6 +1379,7 @@ int aer_get_device_error_info(struct aer_err_info
>*info, int i)
> /* Must reset in this function */
> info->status = 0;
> info->tlp_header_valid = 0;
>+ info->is_cxl = pcie_is_cxl(dev);
>
> /* The device might not support AER */
> if (!aer)
>diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h index
>14c9f943d53f..080829d59c36 100644
>--- a/include/ras/ras_event.h
>+++ b/include/ras/ras_event.h
>@@ -297,15 +297,17 @@ TRACE_EVENT(non_standard_event,
>
> TRACE_EVENT(aer_event,
> TP_PROTO(const char *dev_name,
>+ const char *bus_type,
> const u32 status,
> const u8 severity,
> const u8 tlp_header_valid,
> struct pcie_tlp_log *tlp),
>
>- TP_ARGS(dev_name, status, severity, tlp_header_valid, tlp),
>+ TP_ARGS(dev_name, bus_type, status, severity, tlp_header_valid, tlp),
>
> TP_STRUCT__entry(
> __string( dev_name, dev_name )
>+ __string( bus_type, bus_type )
> __field( u32, status )
> __field( u8, severity )
> __field( u8, tlp_header_valid)
>@@ -314,6 +316,7 @@ TRACE_EVENT(aer_event,
>
> TP_fast_assign(
> __assign_str(dev_name);
>+ __assign_str(bus_type);
> __entry->status = status;
> __entry->severity = severity;
> __entry->tlp_header_valid = tlp_header_valid; @@ -325,8
>+328,8 @@ TRACE_EVENT(aer_event,
> }
> ),
>
>- TP_printk("%s PCIe Bus Error: severity=%s, %s, TLP Header=%s\n",
>- __get_str(dev_name),
>+ TP_printk("%s %s Bus Error: severity=%s, %s, TLP Header=%s\n",
>+ __get_str(dev_name), __get_str(bus_type),
> __entry->severity == AER_CORRECTABLE ? "Corrected" :
> __entry->severity == AER_FATAL ?
> "Fatal" : "Uncorrected, non-fatal",
>--
>2.34.1

Next message: Petr Tesarik: "Re: [PATCH 7/8] docs: dma-api: update streaming DMA API physical address constraints"
Previous message: Yang Li: "Re: [PATCH v2] Bluetooth: hci_event: Add support for handling LE BIG Sync Lost event"
In reply to: Jonathan Cameron: "Re: [PATCH v10 03/17] PCI/AER: Report CXL or PCIe bus error type in trace logging"
Next in thread: Terry Bowman: "[PATCH v10 04/17] CXL/AER: Introduce CXL specific AER driver file"
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