Messages in this thread Patch in this message | | | From | John Keller <> | Subject | [PATCH] - SN: Add support for CPU disable | Date | Tue, 31 Jul 2007 14:45:05 -0500 (CDT) |
| |
Add additional support for CPU disable on SN platforms. Correctly setup the smp_affinity mask for I/O error IRQs. Restrict the use of the feature to Altix 4000 and 450 systems running with a CPU disable capable PROM, and do not allow disabling of CPU 0.
Signed-off-by: John Keller <jpk@sgi.com> ---
arch/ia64/kernel/smpboot.c | 6 ++++ arch/ia64/sn/kernel/huberror.c | 31 +++++++++++++++++++--- arch/ia64/sn/kernel/sn2/sn2_smp.c | 24 +++++++++++++++++ arch/ia64/sn/pci/pcibr/pcibr_provider.c | 10 +++++++ arch/ia64/sn/pci/tioca_provider.c | 10 +++++++ arch/ia64/sn/pci/tioce_provider.c | 11 +++++++ include/asm-ia64/sn/arch.h | 1 include/asm-ia64/sn/sn_feature_sets.h | 1 8 files changed, 90 insertions(+), 4 deletions(-)
Index: linux-2.6/arch/ia64/sn/kernel/huberror.c =================================================================== --- linux-2.6.orig/arch/ia64/sn/kernel/huberror.c 2007-07-31 09:09:55.414522005 -0500 +++ linux-2.6/arch/ia64/sn/kernel/huberror.c 2007-07-31 09:38:14.634045360 -0500 @@ -14,6 +14,7 @@ #include <asm/sn/addrs.h> #include <asm/sn/shubio.h> #include <asm/sn/geo.h> +#include <asm/sn/sn_feature_sets.h> #include "xtalk/xwidgetdev.h" #include "xtalk/hubdev.h" #include <asm/sn/bte.h> @@ -185,11 +186,22 @@ void hubiio_crb_error_handler(struct hub */ void hub_error_init(struct hubdev_info *hubdev_info) { + if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED, - "SN_hub_error", (void *)hubdev_info)) + "SN_hub_error", (void *)hubdev_info)) { printk("hub_error_init: Failed to request_irq for 0x%p\n", hubdev_info); - return; + return; + } + +#ifdef CONFIG_SMP + /* + * On systems which support CPU disabling (SHub2), all error interrupts + * are targetted at the boot CPU. + */ + if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) + set_irq_affinity_info(SGI_II_ERROR, 0, 0); +#endif } @@ -202,11 +214,22 @@ void hub_error_init(struct hubdev_info * */ void ice_error_init(struct hubdev_info *hubdev_info) { + if (request_irq (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error", - (void *)hubdev_info)) + (void *)hubdev_info)) { printk("ice_error_init: request_irq() error hubdev_info 0x%p\n", hubdev_info); - return; + return; + } + +#ifdef CONFIG_SMP + /* + * On systems which support CPU disabling (SHub2), all error interrupts + * are targetted at the boot CPU. + */ + if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) + set_irq_affinity_info(SGI_TIO_ERROR, 0, 0); +#endif } Index: linux-2.6/arch/ia64/sn/pci/pcibr/pcibr_provider.c =================================================================== --- linux-2.6.orig/arch/ia64/sn/pci/pcibr/pcibr_provider.c 2007-07-31 09:09:55.422522987 -0500 +++ linux-2.6/arch/ia64/sn/pci/pcibr/pcibr_provider.c 2007-07-31 09:38:14.662048814 -0500 @@ -17,6 +17,7 @@ #include <asm/sn/sn_sal.h> #include <asm/sn/pic.h> #include <asm/sn/sn2/sn_hwperf.h> +#include <asm/sn/sn_feature_sets.h> #include "xtalk/xwidgetdev.h" #include "xtalk/hubdev.h" @@ -146,6 +147,15 @@ pcibr_bus_fixup(struct pcibus_bussoft *p "pcibr cannot allocate interrupt for error handler\n"); } +#ifdef CONFIG_SMP + /* + * On systems which support CPU disabling (SHub2), all error interrupts + * are targetted at the boot CPU. + */ + if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) + set_irq_affinity_info(SGI_PCIASIC_ERROR, 0, 0); +#endif + /* * Update the Bridge with the "kernel" pagesize */ Index: linux-2.6/arch/ia64/sn/pci/tioca_provider.c =================================================================== --- linux-2.6.orig/arch/ia64/sn/pci/tioca_provider.c 2007-07-31 09:09:55.422522987 -0500 +++ linux-2.6/arch/ia64/sn/pci/tioca_provider.c 2007-07-31 09:38:14.686051774 -0500 @@ -15,6 +15,7 @@ #include <asm/sn/pcidev.h> #include <asm/sn/pcibus_provider_defs.h> #include <asm/sn/tioca_provider.h> +#include <asm/sn/sn_feature_sets.h> u32 tioca_gart_found; EXPORT_SYMBOL(tioca_gart_found); /* used by agp-sgi */ @@ -653,6 +654,15 @@ tioca_bus_fixup(struct pcibus_bussoft *p "Error interrupts won't be routed for TIOCA bus %d\n", __FUNCTION__, SGI_TIOCA_ERROR, (int)tioca_common->ca_common.bs_persist_busnum); +#ifdef CONFIG_SMP + /* + * On systems which support CPU disabling (SHub2), all error interrupts + * are targetted at the boot CPU. + */ + if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) + set_irq_affinity_info(SGI_TIOCA_ERROR, 0, 0); +#endif + /* Setup locality information */ controller->node = tioca_kern->ca_closest_node; Index: linux-2.6/arch/ia64/sn/pci/tioce_provider.c =================================================================== --- linux-2.6.orig/arch/ia64/sn/pci/tioce_provider.c 2007-07-31 09:09:55.422522987 -0500 +++ linux-2.6/arch/ia64/sn/pci/tioce_provider.c 2007-07-31 09:38:14.706054241 -0500 @@ -15,6 +15,7 @@ #include <asm/sn/pcidev.h> #include <asm/sn/pcibus_provider_defs.h> #include <asm/sn/tioce_provider.h> +#include <asm/sn/sn_feature_sets.h> /* * 1/26/2006 @@ -1034,6 +1035,16 @@ tioce_bus_fixup(struct pcibus_bussoft *p tioce_common->ce_pcibus.bs_persist_segment, tioce_common->ce_pcibus.bs_persist_busnum); + +#ifdef CONFIG_SMP + /* + * On systems which support CPU disabling (SHub2), all error interrupts + * are targetted at the boot CPU. + */ + if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) + set_irq_affinity_info(SGI_PCIASIC_ERROR, 0, 0); +#endif + return tioce_common; } Index: linux-2.6/include/asm-ia64/sn/sn_feature_sets.h =================================================================== --- linux-2.6.orig/include/asm-ia64/sn/sn_feature_sets.h 2007-07-31 09:09:59.675044555 -0500 +++ linux-2.6/include/asm-ia64/sn/sn_feature_sets.h 2007-07-31 09:38:14.734057695 -0500 @@ -31,6 +31,7 @@ extern int sn_prom_feature_available(int #define PRF_PAL_CACHE_FLUSH_SAFE 0 #define PRF_DEVICE_FLUSH_LIST 1 #define PRF_HOTPLUG_SUPPORT 2 +#define PRF_CPU_DISABLE_SUPPORT 3 /* --------------------- OS Features -------------------------------*/ Index: linux-2.6/arch/ia64/kernel/smpboot.c =================================================================== --- linux-2.6.orig/arch/ia64/kernel/smpboot.c 2007-07-31 09:09:55.398520043 -0500 +++ linux-2.6/arch/ia64/kernel/smpboot.c 2007-07-31 09:38:14.758060655 -0500 @@ -58,6 +58,7 @@ #include <asm/system.h> #include <asm/tlbflush.h> #include <asm/unistd.h> +#include <asm/sn/arch.h> #define SMP_DEBUG 0 @@ -730,6 +731,11 @@ int __cpu_disable(void) return (-EBUSY); } + if (ia64_platform_is("sn2")) { + if (!sn_cpu_disable_allowed(cpu)) + return -EBUSY; + } + cpu_clear(cpu, cpu_online_map); if (migrate_platform_irqs(cpu)) { Index: linux-2.6/arch/ia64/sn/kernel/sn2/sn2_smp.c =================================================================== --- linux-2.6.orig/arch/ia64/sn/kernel/sn2/sn2_smp.c 2007-07-31 09:09:55.418522496 -0500 +++ linux-2.6/arch/ia64/sn/kernel/sn2/sn2_smp.c 2007-07-31 09:38:14.782063615 -0500 @@ -40,6 +40,7 @@ #include <asm/sn/shub_mmr.h> #include <asm/sn/nodepda.h> #include <asm/sn/rw_mmr.h> +#include <asm/sn/sn_feature_sets.h> DEFINE_PER_CPU(struct ptc_stats, ptcstats); DECLARE_PER_CPU(struct ptc_stats, ptcstats); @@ -429,6 +430,29 @@ void sn2_send_IPI(int cpuid, int vector, sn_send_IPI_phys(nasid, physid, vector, delivery_mode); } +#ifdef CONFIG_HOTPLUG_CPU +/** + * sn_cpu_disable_allowed - Determine if a CPU can be disabled. + * @cpu - CPU that is requested to be disabled. + * + * CPU disable is only allowed on SHub2 systems running with a PROM + * that supports CPU disable. It is not permitted to disable the boot processor. + */ +bool sn_cpu_disable_allowed(int cpu) +{ + if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) + if (cpu != 0) + return true; + else + printk("Disabling the boot processor is not allowed.\n"); + + else + printk("CPU disable is not supported on this system.\n"); + + return false; +} +#endif /* CONFIG_HOTPLUG_CPU */ + #ifdef CONFIG_PROC_FS #define PTC_BASENAME "sgi_sn/ptc_statistics" Index: linux-2.6/include/asm-ia64/sn/arch.h =================================================================== --- linux-2.6.orig/include/asm-ia64/sn/arch.h 2007-07-31 09:09:59.667043574 -0500 +++ linux-2.6/include/asm-ia64/sn/arch.h 2007-07-31 09:38:14.806066576 -0500 @@ -81,5 +81,6 @@ extern u8 sn_sharing_domain_size; extern u8 sn_region_size; extern void sn_flush_all_caches(long addr, long bytes); +extern bool sn_cpu_disable_allowed(int cpu); #endif /* _ASM_IA64_SN_ARCH_H */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |