From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> MCFG handling is a frequent source of problems. Add more logging to aid in debugging. Enable the logging with CONFIG_DYNAMIC_DEBUG=y and the kernel boot parameter 'dyndbg="file arch/x86/pci +p"'. Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> --- arch/x86/pci/acpi.c | 3 +++ arch/x86/pci/mmconfig-shared.c | 23 ++++++++++++++++++----- 2 files changed, 21 insertions(+), 5 deletions(-) diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index ea2eb2ec90e2..55c4b07ec1f6 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -283,6 +283,9 @@ static int setup_mcfg_map(struct acpi_pci_root_info *ci) info->mcfg_added = false; seg = info->sd.domain; + dev_dbg(dev, "%s(%04x %pR ECAM %pa)\n", __func__, seg, + &root->secondary, &root->mcfg_addr); + /* return success if MMCFG is not in use */ if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg) return 0; diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c index 64c39a23d37a..bc1312d920da 100644 --- a/arch/x86/pci/mmconfig-shared.c +++ b/arch/x86/pci/mmconfig-shared.c @@ -579,7 +579,8 @@ static void __init pci_mmcfg_reject_broken(int early) list_for_each_entry(cfg, &pci_mmcfg_list, list) { if (pci_mmcfg_check_reserved(NULL, cfg, early) == 0) { - pr_info(PREFIX "not using MMCONFIG\n"); + pr_info(PREFIX "not using MMCONFIG (%pR not reserved)\n", + &cfg->res); free_all_mmcfg(); return; } @@ -676,6 +677,8 @@ static int pci_mmcfg_for_each_region(int (*func)(__u64 start, __u64 size, static void __init __pci_mmcfg_init(int early) { + pr_debug(PREFIX "%s(%s)\n", __func__, early ? "early" : "late"); + pci_mmcfg_reject_broken(early); if (list_empty(&pci_mmcfg_list)) return; @@ -702,6 +705,8 @@ static int __initdata known_bridge; void __init pci_mmcfg_early_init(void) { + pr_debug(PREFIX "%s() pci_probe %#x\n", __func__, pci_probe); + if (pci_probe & PCI_PROBE_MMCONF) { if (pci_mmcfg_check_hostbridge()) known_bridge = 1; @@ -715,6 +720,8 @@ void __init pci_mmcfg_early_init(void) void __init pci_mmcfg_late_init(void) { + pr_debug(PREFIX "%s() pci_probe %#x\n", __func__, pci_probe); + /* MMCONFIG disabled */ if ((pci_probe & PCI_PROBE_MMCONF) == 0) return; @@ -735,6 +742,8 @@ static int __init pci_mmcfg_late_insert_resources(void) pci_mmcfg_running_state = true; + pr_debug(PREFIX "%s() pci_probe %#x\n", __func__, pci_probe); + /* If we are not using MMCONFIG, don't insert the resources. */ if ((pci_probe & PCI_PROBE_MMCONF) == 0) return 1; @@ -744,9 +753,12 @@ static int __init pci_mmcfg_late_insert_resources(void) * marked so it won't cause request errors when __request_region is * called. */ - list_for_each_entry(cfg, &pci_mmcfg_list, list) - if (!cfg->res.parent) + list_for_each_entry(cfg, &pci_mmcfg_list, list) { + if (!cfg->res.parent) { + pr_debug(PREFIX "%s() insert %pR\n", __func__, &cfg->res); insert_resource(&iomem_resource, &cfg->res); + } + } return 0; } @@ -766,6 +778,8 @@ int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end, struct resource *tmp = NULL; struct pci_mmcfg_region *cfg; + dev_dbg(dev, "%s(%04x [bus %02x-%02x])\n", __func__, seg, start, end); + if (!(pci_probe & PCI_PROBE_MMCONF) || pci_mmcfg_arch_init_failed) return -ENODEV; @@ -810,8 +824,7 @@ int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end, "%s %pR\n", &cfg->res, tmp->name, tmp); } else if (pci_mmcfg_arch_map(cfg)) { - dev_warn(dev, "fail to map MMCONFIG %pR.\n", - &cfg->res); + dev_warn(dev, "fail to map MMCONFIG %pR\n", &cfg->res); } else { list_add_sorted(cfg); dev_info(dev, "MMCONFIG at %pR (base %#lx)\n", -- 2.34.1