diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 3 | ||||
| -rw-r--r-- | arch/x86/pci/common.c | 16 | ||||
| -rw-r--r-- | drivers/pci/pci.c | 3 | ||||
| -rw-r--r-- | drivers/pci/probe.c | 8 | ||||
| -rw-r--r-- | include/asm-generic/pci-bridge.h | 6 |
5 files changed, 34 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index c1601e5a8b71..f995195409fd 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2161,6 +2161,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. on: Turn realloc on realloc same as realloc=on noari do not use PCIe ARI. + pcie_scan_all Scan all possible PCIe devices. Otherwise we + only look for one device below a PCIe downstream + port. pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power Management. diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c index 323481e06ef8..16c5d7835295 100644 --- a/arch/x86/pci/common.c +++ b/arch/x86/pci/common.c @@ -11,6 +11,7 @@ #include <linux/dmi.h> #include <linux/slab.h> +#include <asm-generic/pci-bridge.h> #include <asm/acpi.h> #include <asm/segment.h> #include <asm/io.h> @@ -229,6 +230,14 @@ static int __devinit assign_all_busses(const struct dmi_system_id *d) } #endif +static int __devinit set_scan_all(const struct dmi_system_id *d) +{ + printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n", + d->ident); + pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS); + return 0; +} + static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = { #ifdef __i386__ /* @@ -420,6 +429,13 @@ static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"), }, }, + { + .callback = set_scan_all, + .ident = "Stratus/NEC ftServer", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ftServer"), + }, + }, {} }; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 111569ccab43..8e6c38817036 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -22,6 +22,7 @@ #include <linux/interrupt.h> #include <linux/device.h> #include <linux/pm_runtime.h> +#include <asm-generic/pci-bridge.h> #include <asm/setup.h> #include "pci.h" @@ -3893,6 +3894,8 @@ static int __init pci_setup(char *str) pcie_bus_config = PCIE_BUS_PERFORMANCE; } else if (!strncmp(str, "pcie_bus_peer2peer", 18)) { pcie_bus_config = PCIE_BUS_PEER2PEER; + } else if (!strncmp(str, "pcie_scan_all", 13)) { + pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS); } else { printk(KERN_ERR "PCI: Unknown option `%s'\n", str); diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 5e1ca3c58a7d..2dc8675eea1a 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -10,6 +10,7 @@ #include <linux/module.h> #include <linux/cpumask.h> #include <linux/pci-aspm.h> +#include <asm-generic/pci-bridge.h> #include "pci.h" #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ @@ -1395,10 +1396,13 @@ static unsigned no_next_fn(struct pci_dev *dev, unsigned fn) static int only_one_child(struct pci_bus *bus) { struct pci_dev *parent = bus->self; + if (!parent || !pci_is_pcie(parent)) return 0; - if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT || - parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM) + if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT) + return 1; + if (parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM && + !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) return 1; return 0; } diff --git a/include/asm-generic/pci-bridge.h b/include/asm-generic/pci-bridge.h index a5b5d5a89a4f..20db2e5a0a69 100644 --- a/include/asm-generic/pci-bridge.h +++ b/include/asm-generic/pci-bridge.h @@ -30,6 +30,12 @@ enum { PCI_ENABLE_PROC_DOMAINS = 0x00000010, /* ... except for domain 0 */ PCI_COMPAT_DOMAIN_0 = 0x00000020, + + /* PCIe downstream ports are bridges that normally lead to only a + * device 0, but if this is set, we scan all possible devices, not + * just device 0. + */ + PCI_SCAN_ALL_PCIE_DEVS = 0x00000040, }; #ifdef CONFIG_PCI |