Re: [PATCH v8 13/20] PCI/ERR: Add printk level to pcie_print_tlp_log()

[Sathyanarayanan Kuppuswamy]

On 5/22/25 4:21 PM, Bjorn Helgaas wrote:

From: Bjorn Helgaas <bhelg...@google.com>

aer_print_error() produces output at a printk level (KERN_ERR/KERN_WARNING/
etc) that depends on the kind of error, and it calls pcie_print_tlp_log(),
which previously always produced output at KERN_ERR.

Add a "level" parameter so aer_print_error() can control the level of the
pcie_print_tlp_log() output to match.

Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
---

Reviewed-by: Kuppuswamy Sathyanarayanan 
<sathyanarayanan.kuppusw...@linux.intel.com>

  drivers/pci/pci.h      | 3 ++-
  drivers/pci/pcie/aer.c | 5 +++--
  drivers/pci/pcie/dpc.c | 2 +-
  drivers/pci/pcie/tlp.c | 6 ++++--
  4 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 705f9ef58acc..1a9bfc708757 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -613,7 +613,8 @@ int pcie_read_tlp_log(struct pci_dev *dev, int where, int 
where2,
                      struct pcie_tlp_log *log);
  unsigned int aer_tlp_log_len(struct pci_dev *dev, u32 aercc);
  void pcie_print_tlp_log(const struct pci_dev *dev,
-                       const struct pcie_tlp_log *log, const char *pfx);
+                       const struct pcie_tlp_log *log, const char *level,
+                       const char *pfx);
  #endif        /* CONFIG_PCIEAER */

#ifdef CONFIG_PCIEPORTBUS

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index f80c78846a14..f0936759ba8b 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -734,7 +734,7 @@ void aer_print_error(struct pci_dev *dev, struct 
aer_err_info *info)
        __aer_print_error(dev, info);

if (info->tlp_header_valid)

-               pcie_print_tlp_log(dev, &info->tlp, dev_fmt("  "));
+               pcie_print_tlp_log(dev, &info->tlp, level, dev_fmt("  "));

out:

        if (info->id && info->error_dev_num > 1 && info->id == id)
@@ -797,7 +797,8 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity,
                        aer->uncor_severity);

if (tlp_header_valid)

-               pcie_print_tlp_log(dev, &aer->header_log, dev_fmt("  "));
+               pcie_print_tlp_log(dev, &aer->header_log, info.level,
+                                  dev_fmt("  "));
  }
  EXPORT_SYMBOL_NS_GPL(pci_print_aer, "CXL");

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c

index 6c98fabdba57..7ae1590ea1da 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -222,7 +222,7 @@ static void dpc_process_rp_pio_error(struct pci_dev *pdev)
                          dpc_tlp_log_len(pdev),
                          pdev->subordinate->flit_mode,
                          &tlp_log);
-       pcie_print_tlp_log(pdev, &tlp_log, dev_fmt(""));
+       pcie_print_tlp_log(pdev, &tlp_log, KERN_ERR, dev_fmt(""));

if (pdev->dpc_rp_log_size < PCIE_STD_NUM_TLP_HEADERLOG + 1)

                goto clear_status;
diff --git a/drivers/pci/pcie/tlp.c b/drivers/pci/pcie/tlp.c
index 890d5391d7f5..71f8fc9ea2ed 100644
--- a/drivers/pci/pcie/tlp.c
+++ b/drivers/pci/pcie/tlp.c
@@ -98,12 +98,14 @@ int pcie_read_tlp_log(struct pci_dev *dev, int where, int 
where2,
   * pcie_print_tlp_log - Print TLP Header / Prefix Log contents
   * @dev: PCIe device
   * @log: TLP Log structure
+ * @level: Printk log level
   * @pfx: String prefix
   *
   * Prints TLP Header and Prefix Log information held by @log.
   */
  void pcie_print_tlp_log(const struct pci_dev *dev,
-                       const struct pcie_tlp_log *log, const char *pfx)
+                       const struct pcie_tlp_log *log, const char *level,
+                       const char *pfx)
  {
        /* EE_PREFIX_STR fits the extended DW space needed for the Flit mode */
        char buf[11 * PCIE_STD_MAX_TLP_HEADERLOG + 1];
@@ -130,6 +132,6 @@ void pcie_print_tlp_log(const struct pci_dev *dev,
                }
        }

- pci_err(dev, "%sTLP Header%s: %s\n", pfx,

+       dev_printk(level, &dev->dev, "%sTLP Header%s: %s\n", pfx,
                log->flit ? " (Flit)" : "", buf);
  }

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer