diff options
author | Scott Wood <scottwood@freescale.com> | 2013-12-14 01:15:24 (GMT) |
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committer | Scott Wood <scottwood@freescale.com> | 2013-12-14 01:15:24 (GMT) |
commit | b7c81aa3ab2ac2c140e278b6d0e9a0b95112cf0b (patch) | |
tree | 87828aaf5f82c7042bfc0307bc4ac499e10f93fb /arch/powerpc/kernel/eeh_event.c | |
parent | 22c782a4b14773fab7eab3c1db54ad7ad077e9b8 (diff) | |
parent | 78fd82238d0e5716578c326404184a27ba67fd6e (diff) | |
download | linux-fsl-qoriq-b7c81aa3ab2ac2c140e278b6d0e9a0b95112cf0b.tar.xz |
Merge remote-tracking branch 'linus/master' into merge
Conflicts:
Documentation/hwmon/ina2xx
arch/powerpc/Kconfig
arch/powerpc/boot/dts/b4860emu.dts
arch/powerpc/boot/dts/b4qds.dtsi
arch/powerpc/boot/dts/fsl/b4si-post.dtsi
arch/powerpc/boot/dts/fsl/qoriq-sec6.0-0.dtsi
arch/powerpc/boot/dts/p1023rdb.dts
arch/powerpc/boot/dts/t4240emu.dts
arch/powerpc/boot/dts/t4240qds.dts
arch/powerpc/configs/85xx/p1023_defconfig
arch/powerpc/configs/corenet32_smp_defconfig
arch/powerpc/configs/corenet64_smp_defconfig
arch/powerpc/configs/mpc85xx_smp_defconfig
arch/powerpc/include/asm/cputable.h
arch/powerpc/include/asm/device.h
arch/powerpc/include/asm/epapr_hcalls.h
arch/powerpc/include/asm/kvm_host.h
arch/powerpc/include/asm/mpic.h
arch/powerpc/include/asm/pci.h
arch/powerpc/include/asm/ppc-opcode.h
arch/powerpc/include/asm/ppc_asm.h
arch/powerpc/include/asm/reg_booke.h
arch/powerpc/kernel/epapr_paravirt.c
arch/powerpc/kernel/process.c
arch/powerpc/kernel/prom.c
arch/powerpc/kernel/setup-common.c
arch/powerpc/kernel/setup_32.c
arch/powerpc/kernel/setup_64.c
arch/powerpc/kernel/smp.c
arch/powerpc/kernel/swsusp_asm64.S
arch/powerpc/kernel/swsusp_booke.S
arch/powerpc/kvm/book3s_pr.c
arch/powerpc/kvm/booke.c
arch/powerpc/kvm/booke.h
arch/powerpc/kvm/e500.c
arch/powerpc/kvm/e500.h
arch/powerpc/kvm/e500_emulate.c
arch/powerpc/kvm/e500mc.c
arch/powerpc/kvm/powerpc.c
arch/powerpc/perf/e6500-pmu.c
arch/powerpc/platforms/85xx/Kconfig
arch/powerpc/platforms/85xx/Makefile
arch/powerpc/platforms/85xx/b4_qds.c
arch/powerpc/platforms/85xx/c293pcie.c
arch/powerpc/platforms/85xx/corenet_ds.c
arch/powerpc/platforms/85xx/corenet_ds.h
arch/powerpc/platforms/85xx/p1023_rds.c
arch/powerpc/platforms/85xx/p2041_rdb.c
arch/powerpc/platforms/85xx/p3041_ds.c
arch/powerpc/platforms/85xx/p4080_ds.c
arch/powerpc/platforms/85xx/p5020_ds.c
arch/powerpc/platforms/85xx/p5040_ds.c
arch/powerpc/platforms/85xx/smp.c
arch/powerpc/platforms/85xx/t4240_qds.c
arch/powerpc/platforms/Kconfig
arch/powerpc/sysdev/Makefile
arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c
arch/powerpc/sysdev/fsl_msi.c
arch/powerpc/sysdev/fsl_pci.c
arch/powerpc/sysdev/fsl_pci.h
arch/powerpc/sysdev/fsl_soc.h
arch/powerpc/sysdev/mpic.c
arch/powerpc/sysdev/mpic_timer.c
drivers/Kconfig
drivers/clk/Kconfig
drivers/clk/clk-ppc-corenet.c
drivers/cpufreq/Kconfig.powerpc
drivers/cpufreq/Makefile
drivers/cpufreq/ppc-corenet-cpufreq.c
drivers/crypto/caam/Kconfig
drivers/crypto/caam/Makefile
drivers/crypto/caam/ctrl.c
drivers/crypto/caam/desc_constr.h
drivers/crypto/caam/intern.h
drivers/crypto/caam/jr.c
drivers/crypto/caam/regs.h
drivers/dma/fsldma.c
drivers/hwmon/ina2xx.c
drivers/iommu/Kconfig
drivers/iommu/fsl_pamu.c
drivers/iommu/fsl_pamu.h
drivers/iommu/fsl_pamu_domain.c
drivers/iommu/fsl_pamu_domain.h
drivers/misc/Makefile
drivers/mmc/card/block.c
drivers/mmc/core/core.c
drivers/mmc/host/sdhci-esdhc.h
drivers/mmc/host/sdhci-pltfm.c
drivers/mtd/nand/fsl_ifc_nand.c
drivers/net/ethernet/freescale/gianfar.c
drivers/net/ethernet/freescale/gianfar.h
drivers/net/ethernet/freescale/gianfar_ethtool.c
drivers/net/phy/at803x.c
drivers/net/phy/phy_device.c
drivers/net/phy/vitesse.c
drivers/pci/msi.c
drivers/staging/Kconfig
drivers/staging/Makefile
drivers/uio/Kconfig
drivers/uio/Makefile
drivers/uio/uio.c
drivers/usb/host/ehci-fsl.c
drivers/vfio/Kconfig
drivers/vfio/Makefile
include/crypto/algapi.h
include/linux/iommu.h
include/linux/mmc/sdhci.h
include/linux/msi.h
include/linux/netdev_features.h
include/linux/phy.h
include/linux/skbuff.h
include/net/ip.h
include/uapi/linux/vfio.h
net/core/ethtool.c
net/ipv4/route.c
net/ipv6/route.c
Diffstat (limited to 'arch/powerpc/kernel/eeh_event.c')
-rw-r--r-- | arch/powerpc/kernel/eeh_event.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/eeh_event.c b/arch/powerpc/kernel/eeh_event.c new file mode 100644 index 0000000..72d748b --- /dev/null +++ b/arch/powerpc/kernel/eeh_event.c @@ -0,0 +1,187 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Copyright (c) 2005 Linas Vepstas <linas@linas.org> + */ + +#include <linux/delay.h> +#include <linux/list.h> +#include <linux/sched.h> +#include <linux/semaphore.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/kthread.h> +#include <asm/eeh_event.h> +#include <asm/ppc-pci.h> + +/** Overview: + * EEH error states may be detected within exception handlers; + * however, the recovery processing needs to occur asynchronously + * in a normal kernel context and not an interrupt context. + * This pair of routines creates an event and queues it onto a + * work-queue, where a worker thread can drive recovery. + */ + +static DEFINE_SPINLOCK(eeh_eventlist_lock); +static struct semaphore eeh_eventlist_sem; +LIST_HEAD(eeh_eventlist); + +/** + * eeh_event_handler - Dispatch EEH events. + * @dummy - unused + * + * The detection of a frozen slot can occur inside an interrupt, + * where it can be hard to do anything about it. The goal of this + * routine is to pull these detection events out of the context + * of the interrupt handler, and re-dispatch them for processing + * at a later time in a normal context. + */ +static int eeh_event_handler(void * dummy) +{ + unsigned long flags; + struct eeh_event *event; + struct eeh_pe *pe; + + while (!kthread_should_stop()) { + if (down_interruptible(&eeh_eventlist_sem)) + break; + + /* Fetch EEH event from the queue */ + spin_lock_irqsave(&eeh_eventlist_lock, flags); + event = NULL; + if (!list_empty(&eeh_eventlist)) { + event = list_entry(eeh_eventlist.next, + struct eeh_event, list); + list_del(&event->list); + } + spin_unlock_irqrestore(&eeh_eventlist_lock, flags); + if (!event) + continue; + + /* We might have event without binding PE */ + pe = event->pe; + if (pe) { + eeh_pe_state_mark(pe, EEH_PE_RECOVERING); + if (pe->type & EEH_PE_PHB) + pr_info("EEH: Detected error on PHB#%d\n", + pe->phb->global_number); + else + pr_info("EEH: Detected PCI bus error on " + "PHB#%d-PE#%x\n", + pe->phb->global_number, pe->addr); + eeh_handle_event(pe); + eeh_pe_state_clear(pe, EEH_PE_RECOVERING); + } else { + eeh_handle_event(NULL); + } + + kfree(event); + } + + return 0; +} + +/** + * eeh_event_init - Start kernel thread to handle EEH events + * + * This routine is called to start the kernel thread for processing + * EEH event. + */ +int eeh_event_init(void) +{ + struct task_struct *t; + int ret = 0; + + /* Initialize semaphore */ + sema_init(&eeh_eventlist_sem, 0); + + t = kthread_run(eeh_event_handler, NULL, "eehd"); + if (IS_ERR(t)) { + ret = PTR_ERR(t); + pr_err("%s: Failed to start EEH daemon (%d)\n", + __func__, ret); + return ret; + } + + return 0; +} + +/** + * eeh_send_failure_event - Generate a PCI error event + * @pe: EEH PE + * + * This routine can be called within an interrupt context; + * the actual event will be delivered in a normal context + * (from a workqueue). + */ +int eeh_send_failure_event(struct eeh_pe *pe) +{ + unsigned long flags; + struct eeh_event *event; + + event = kzalloc(sizeof(*event), GFP_ATOMIC); + if (!event) { + pr_err("EEH: out of memory, event not handled\n"); + return -ENOMEM; + } + event->pe = pe; + + /* We may or may not be called in an interrupt context */ + spin_lock_irqsave(&eeh_eventlist_lock, flags); + list_add(&event->list, &eeh_eventlist); + spin_unlock_irqrestore(&eeh_eventlist_lock, flags); + + /* For EEH deamon to knick in */ + up(&eeh_eventlist_sem); + + return 0; +} + +/** + * eeh_remove_event - Remove EEH event from the queue + * @pe: Event binding to the PE + * + * On PowerNV platform, we might have subsequent coming events + * is part of the former one. For that case, those subsequent + * coming events are totally duplicated and unnecessary, thus + * they should be removed. + */ +void eeh_remove_event(struct eeh_pe *pe) +{ + unsigned long flags; + struct eeh_event *event, *tmp; + + spin_lock_irqsave(&eeh_eventlist_lock, flags); + list_for_each_entry_safe(event, tmp, &eeh_eventlist, list) { + /* + * If we don't have valid PE passed in, that means + * we already have event corresponding to dead IOC + * and all events should be purged. + */ + if (!pe) { + list_del(&event->list); + kfree(event); + } else if (pe->type & EEH_PE_PHB) { + if (event->pe && event->pe->phb == pe->phb) { + list_del(&event->list); + kfree(event); + } + } else if (event->pe == pe) { + list_del(&event->list); + kfree(event); + } + } + spin_unlock_irqrestore(&eeh_eventlist_lock, flags); +} |