Add pcie_print_tlp_log() helper to print TLP Header and Prefix Log. Print End-End Prefixes only if they are non-zero. Consolidate the few places which currently print TLP using custom formatting. The first attempt used pr_cont() instead of building a string first but it turns out pr_cont() is not compatible with pci_err() but prints on a separate line. When I asked about this, Andy Shevchenko suggested pr_cont() should not be used in the first place (to eventually get rid of it) so pr_cont() is now replaced with building the string first. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> --- drivers/pci/pci.c | 32 ++++++++++++++++++++++++++++++++ drivers/pci/pcie/aer.c | 10 ++-------- drivers/pci/pcie/dpc.c | 5 +---- include/linux/aer.h | 2 ++ 4 files changed, 37 insertions(+), 12 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index af230e6e5557..54d4872d14b8 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -9,6 +9,7 @@ */ #include <linux/acpi.h> +#include <linux/array_size.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/dmi.h> @@ -1116,6 +1117,37 @@ int pcie_read_tlp_log(struct pci_dev *dev, int where, int where2, } EXPORT_SYMBOL_GPL(pcie_read_tlp_log); +/** + * pcie_print_tlp_log - Print TLP Header / Prefix Log contents + * @dev: PCIe device + * @tlp_log: TLP Log structure + * @pfx: Internal string prefix (for indentation) + * + * Prints TLP Header and Prefix Log information held by @tlp_log. + */ +void pcie_print_tlp_log(const struct pci_dev *dev, + const struct pcie_tlp_log *tlp_log, const char *pfx) +{ + char buf[(10 + 1) * (4 + ARRAY_SIZE(tlp_log->prefix)) + 14 + 1]; + unsigned int i; + int len; + + len = scnprintf(buf, sizeof(buf), "%#010x %#010x %#010x %#010x", + tlp_log->dw[0], tlp_log->dw[1], tlp_log->dw[2], + tlp_log->dw[3]); + + if (tlp_log->prefix[0]) + len += scnprintf(buf + len, sizeof(buf) - len, " E-E Prefixes:"); + for (i = 0; i < ARRAY_SIZE(tlp_log->prefix); i++) { + if (!tlp_log->prefix[i]) + break; + len += scnprintf(buf + len, sizeof(buf) - len, + " %#010x", tlp_log->prefix[i]); + } + + pci_err(dev, "%sTLP Header: %s\n", pfx, buf); +} + /** * pci_restore_bars - restore a device's BAR values (e.g. after wake-up) * @dev: PCI device to have its BARs restored diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index ecc1dea5a208..efb9e728fe94 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -664,12 +664,6 @@ static void pci_rootport_aer_stats_incr(struct pci_dev *pdev, } } -static void __print_tlp_header(struct pci_dev *dev, struct pcie_tlp_log *t) -{ - pci_err(dev, " TLP Header: %08x %08x %08x %08x\n", - t->dw[0], t->dw[1], t->dw[2], t->dw[3]); -} - static void __aer_print_error(struct pci_dev *dev, struct aer_err_info *info) { @@ -724,7 +718,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info) __aer_print_error(dev, info); if (info->tlp_header_valid) - __print_tlp_header(dev, &info->tlp); + pcie_print_tlp_log(dev, &info->tlp, " "); out: if (info->id && info->error_dev_num > 1 && info->id == id) @@ -796,7 +790,7 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity, aer->uncor_severity); if (tlp_header_valid) - __print_tlp_header(dev, &aer->header_log); + pcie_print_tlp_log(dev, &aer->header_log, " "); trace_aer_event(dev_name(&dev->dev), (status & ~mask), aer_severity, tlp_header_valid, &aer->header_log); diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index 80b1456f95fe..3f8e3b6c7948 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -229,10 +229,7 @@ static void dpc_process_rp_pio_error(struct pci_dev *pdev) pcie_read_tlp_log(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG, cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG, dpc_tlp_log_len(pdev), &tlp_log); - pci_err(pdev, "TLP Header: %#010x %#010x %#010x %#010x\n", - tlp_log.dw[0], tlp_log.dw[1], tlp_log.dw[2], tlp_log.dw[3]); - for (i = 0; i < pdev->dpc_rp_log_size - 5; i++) - pci_err(pdev, "TLP Prefix Header: dw%d, %#010x\n", i, tlp_log.prefix[i]); + pcie_print_tlp_log(pdev, &tlp_log, ""); if (pdev->dpc_rp_log_size < 5) goto clear_status; diff --git a/include/linux/aer.h b/include/linux/aer.h index 2484056feb8d..1e8c61deca65 100644 --- a/include/linux/aer.h +++ b/include/linux/aer.h @@ -41,6 +41,8 @@ struct aer_capability_regs { int pcie_read_tlp_log(struct pci_dev *dev, int where, int where2, unsigned int tlp_len, struct pcie_tlp_log *log); unsigned int aer_tlp_log_len(struct pci_dev *dev); +void pcie_print_tlp_log(const struct pci_dev *dev, + const struct pcie_tlp_log *tlp_log, const char *pfx); #if defined(CONFIG_PCIEAER) int pci_aer_clear_nonfatal_status(struct pci_dev *dev); -- 2.39.2