diff options
Diffstat (limited to 'arch/x86/pci/amd_bus.c')
| -rw-r--r-- | arch/x86/pci/amd_bus.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c index fc1e8fe07e5c..e27dffbbb1a7 100644 --- a/arch/x86/pci/amd_bus.c +++ b/arch/x86/pci/amd_bus.c @@ -4,6 +4,7 @@ #include <linux/cpu.h> #include <linux/range.h> +#include <asm/amd_nb.h> #include <asm/pci_x86.h> #include <asm/pci-direct.h> @@ -378,6 +379,34 @@ static struct notifier_block __cpuinitdata amd_cpu_notifier = { .notifier_call = amd_cpu_notify, }; +static void __init pci_enable_pci_io_ecs(void) +{ +#ifdef CONFIG_AMD_NB + unsigned int i, n; + + for (n = i = 0; !n && amd_nb_bus_dev_ranges[i].dev_limit; ++i) { + u8 bus = amd_nb_bus_dev_ranges[i].bus; + u8 slot = amd_nb_bus_dev_ranges[i].dev_base; + u8 limit = amd_nb_bus_dev_ranges[i].dev_limit; + + for (; slot < limit; ++slot) { + u32 val = read_pci_config(bus, slot, 3, 0); + + if (!early_is_amd_nb(val)) + continue; + + val = read_pci_config(bus, slot, 3, 0x8c); + if (!(val & (ENABLE_CF8_EXT_CFG >> 32))) { + val |= ENABLE_CF8_EXT_CFG >> 32; + write_pci_config(bus, slot, 3, 0x8c, val); + } + ++n; + } + } + pr_info("Extended Config Space enabled on %u nodes\n", n); +#endif +} + static int __init pci_io_ecs_init(void) { int cpu; @@ -386,6 +415,10 @@ static int __init pci_io_ecs_init(void) if (boot_cpu_data.x86 < 0x10) return 0; + /* Try the PCI method first. */ + if (early_pci_allowed()) + pci_enable_pci_io_ecs(); + register_cpu_notifier(&amd_cpu_notifier); for_each_online_cpu(cpu) amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE, |