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PCI: trace: Add PCI controller tracepoint feature

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Some PCI controllers may provide debug functionalities to track PCI bus
activities like LTSSM state transitions and data rate changes. These will
be very useful for debugging PCI link specific issues such as endpoint not
getting detected or performance issues.

Hence, implement the PCI controller tracepoint feature for recording LTSSM
state transitions and data rate changes.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
[mani: commit log and maintainers entry]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://patch.msgid.link/1774403912-210670-2-git-send-email-shawn.lin@rock-chips.com
This commit is contained in:
Shawn Lin
2026-03-25 09:58:30 +08:00
committed by Manivannan Sadhasivam
parent 6de23f81a5
commit d1b7add89c
3 changed files with 60 additions and 0 deletions
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1
MAINTAINERS
View File

@@ -20399,6 +20399,7 @@ F: Documentation/devicetree/bindings/pci/
F: drivers/pci/controller/
F: drivers/pci/pci-bridge-emul.c
F: drivers/pci/pci-bridge-emul.h
F: include/trace/events/pci_controller.h
PCI PEER-TO-PEER DMA (P2PDMA)
M: Bjorn Helgaas <bhelgaas@google.com>

1
drivers/pci/trace.c
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@@ -9,3 +9,4 @@
#define CREATE_TRACE_POINTS
#include <trace/events/pci.h>
#include <trace/events/pci_controller.h>

58
include/trace/events/pci_controller.h Normal file
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@@ -0,0 +1,58 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM pci_controller
#if !defined(_TRACE_HW_EVENT_PCI_CONTROLLER_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HW_EVENT_PCI_CONTROLLER_H
#include <uapi/linux/pci_regs.h>
#include <linux/tracepoint.h>
#define RATE \
EM(PCIE_SPEED_2_5GT, "2.5 GT/s") \
EM(PCIE_SPEED_5_0GT, "5.0 GT/s") \
EM(PCIE_SPEED_8_0GT, "8.0 GT/s") \
EM(PCIE_SPEED_16_0GT, "16.0 GT/s") \
EM(PCIE_SPEED_32_0GT, "32.0 GT/s") \
EM(PCIE_SPEED_64_0GT, "64.0 GT/s") \
EMe(PCI_SPEED_UNKNOWN, "Unknown")
#undef EM
#undef EMe
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define EMe(a, b) TRACE_DEFINE_ENUM(a);
RATE
#undef EM
#undef EMe
#define EM(a, b) {a, b},
#define EMe(a, b) {a, b}
TRACE_EVENT(pcie_ltssm_state_transition,
TP_PROTO(const char *dev_name, const char *state, u32 rate),
TP_ARGS(dev_name, state, rate),
TP_STRUCT__entry(
__string(dev_name, dev_name)
__string(state, state)
__field(u32, rate)
),
TP_fast_assign(
__assign_str(dev_name);
__assign_str(state);
__entry->rate = rate;
),
TP_printk("dev: %s state: %s rate: %s",
__get_str(dev_name), __get_str(state),
__print_symbolic(__entry->rate, RATE)
)
);
#endif /* _TRACE_HW_EVENT_PCI_CONTROLLER_H */
/* This part must be outside protection */
#include <trace/define_trace.h>