Re: [PATCH v3] PCI: dwc: Add PCIe event counters for groups 5 to 7 in DWC debugfs
From: Shawn Lin
Date: Sat Mar 07 2026 - 04:06:24 EST
在 2026/03/07 星期六 10:01, Hans Zhang 写道:
Extend the DesignWare PCIe controller's debugfs statistical counter
interface with event definitions from groups 5 through 7 as documented
in the DWC PCIe Databook (version 6.30a, section 3.8.2.3, Tables 3-59,
3-60, 3-61). These counters provide visibility into Layer1 non-error
events (link state transitions,ASPM, L1 substates), Layer2 DLLP
exchanges, and Layer3 TLP transactions.
Re-check the events one by one against the v6.30a databook, the new
events are correct.
Reviewed-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
The counters are exposed under the debugfs statistical counter directory,
allowing users to monitor link behavior and diagnose PCIe protocol issues
more effectively.
Co-developed-by: Cheng Xin <chengqin195275@xxxxxxx>
Signed-off-by: Cheng Xin <chengqin195275@xxxxxxx>
Signed-off-by: Hans Zhang <18255117159@xxxxxxx>
---
Thank you, Cheng Xin, for providing the 6.30a version of the DWC PCIe Data Book.
Changes for v3:
- Correct the incorrect version information of the databook. Thank you, Shawn, for the reminder.
Changes for v2:
- Sorry, I sent the patch multiple times in a row. The first version of
the email was incorrect. The email address of Cheng Xin has been corrected.
---
.../controller/dwc/pcie-designware-debugfs.c | 52 ++++++++++++++++++-
1 file changed, 51 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-debugfs.c b/drivers/pci/controller/dwc/pcie-designware-debugfs.c
index 0d1340c9b364..2efddb21b2b2 100644
--- a/drivers/pci/controller/dwc/pcie-designware-debugfs.c
+++ b/drivers/pci/controller/dwc/pcie-designware-debugfs.c
@@ -131,13 +131,16 @@ static const u32 err_inj_type_mask[] = {
* supported in DWC RAS DES
* @name: Name of the error counter
* @group_no: Group number that the event belongs to. The value can range
- * from 0 to 4
+ * from 0 to 7
* @event_no: Event number of the particular event. The value ranges are:
* Group 0: 0 - 10
* Group 1: 5 - 13
* Group 2: 0 - 7
* Group 3: 0 - 5
* Group 4: 0 - 1
+ * Group 5: 0 - 13
+ * Group 6: 0 - 6
+ * Group 7: 0 - 25
*/
struct dwc_pcie_event_counter {
const char *name;
@@ -181,6 +184,53 @@ static const struct dwc_pcie_event_counter event_list[] = {
{"completion_timeout", 0x3, 0x5},
{"ebuf_skp_add", 0x4, 0x0},
{"ebuf_skp_del", 0x4, 0x1},
+ {"l0_to_recovery_entry", 0x5, 0x0},
+ {"l1_to_recovery_entry", 0x5, 0x1},
+ {"tx_l0s_entry", 0x5, 0x2},
+ {"rx_l0s_entry", 0x5, 0x3},
+ {"aspm_l1_reject", 0x5, 0x4},
+ {"l1_entry", 0x5, 0x5},
+ {"l1_cpm", 0x5, 0x6},
+ {"l1.1_entry", 0x5, 0x7},
+ {"l1.2_entry", 0x5, 0x8},
+ {"l1_short_duration", 0x5, 0x9},
+ {"l1.2_abort", 0x5, 0xa},
+ {"l2_entry", 0x5, 0xb},
+ {"speed_change", 0x5, 0xc},
+ {"link_width_change", 0x5, 0xd},
+ {"tx_ack_dllp", 0x6, 0x0},
+ {"tx_update_fc_dllp", 0x6, 0x1},
+ {"rx_ack_dllp", 0x6, 0x2},
+ {"rx_update_fc_dllp", 0x6, 0x3},
+ {"rx_nullified_tlp", 0x6, 0x4},
+ {"tx_nullified_tlp", 0x6, 0x5},
+ {"rx_duplicate_tlp", 0x6, 0x6},
+ {"tx_memory_write", 0x7, 0x0},
+ {"tx_memory_read", 0x7, 0x1},
+ {"tx_configuration_write", 0x7, 0x2},
+ {"tx_configuration_read", 0x7, 0x3},
+ {"tx_io_write", 0x7, 0x4},
+ {"tx_io_read", 0x7, 0x5},
+ {"tx_completion_without_data", 0x7, 0x6},
+ {"tx_completion_w_data", 0x7, 0x7},
+ {"tx_message_tlp_pcie_vc_only", 0x7, 0x8},
+ {"tx_atomic", 0x7, 0x9},
+ {"tx_tlp_with_prefix", 0x7, 0xa},
+ {"rx_memory_write", 0x7, 0xb},
+ {"rx_memory_read", 0x7, 0xc},
+ {"rx_configuration_write", 0x7, 0xd},
+ {"rx_configuration_read", 0x7, 0xe},
+ {"rx_io_write", 0x7, 0xf},
+ {"rx_io_read", 0x7, 0x10},
+ {"rx_completion_without_data", 0x7, 0x11},
+ {"rx_completion_w_data", 0x7, 0x12},
+ {"rx_message_tlp_pcie_vc_only", 0x7, 0x13},
+ {"rx_atomic", 0x7, 0x14},
+ {"rx_tlp_with_prefix", 0x7, 0x15},
+ {"tx_ccix_tlp", 0x7, 0x16},
+ {"rx_ccix_tlp", 0x7, 0x17},
+ {"tx_deferrable_memory_write_tlp", 0x7, 0x18},
+ {"rx_deferrable_memory_write_tlp", 0x7, 0x19},
};
static ssize_t lane_detect_read(struct file *file, char __user *buf,
base-commit: 325a118c12045239076b7ea9e66391dd6f56f72e