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- /*
- * Copyright IBM Corporation 2001, 2005, 2006
- * Copyright Dave Engebretsen & Todd Inglett 2001
- * Copyright Linas Vepstas 2005, 2006
- * Copyright 2001-2012 IBM Corporation.
- *
- * 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
- *
- * Please address comments and feedback to Linas Vepstas <linas@austin.ibm.com>
- */
- #include <linux/delay.h>
- #include <linux/debugfs.h>
- #include <linux/sched.h>
- #include <linux/init.h>
- #include <linux/list.h>
- #include <linux/pci.h>
- #include <linux/iommu.h>
- #include <linux/proc_fs.h>
- #include <linux/rbtree.h>
- #include <linux/reboot.h>
- #include <linux/seq_file.h>
- #include <linux/spinlock.h>
- #include <linux/export.h>
- #include <linux/of.h>
- #include <linux/atomic.h>
- #include <asm/debug.h>
- #include <asm/eeh.h>
- #include <asm/eeh_event.h>
- #include <asm/io.h>
- #include <asm/iommu.h>
- #include <asm/machdep.h>
- #include <asm/ppc-pci.h>
- #include <asm/rtas.h>
- /** Overview:
- * EEH, or "Enhanced Error Handling" is a PCI bridge technology for
- * dealing with PCI bus errors that can't be dealt with within the
- * usual PCI framework, except by check-stopping the CPU. Systems
- * that are designed for high-availability/reliability cannot afford
- * to crash due to a "mere" PCI error, thus the need for EEH.
- * An EEH-capable bridge operates by converting a detected error
- * into a "slot freeze", taking the PCI adapter off-line, making
- * the slot behave, from the OS'es point of view, as if the slot
- * were "empty": all reads return 0xff's and all writes are silently
- * ignored. EEH slot isolation events can be triggered by parity
- * errors on the address or data busses (e.g. during posted writes),
- * which in turn might be caused by low voltage on the bus, dust,
- * vibration, humidity, radioactivity or plain-old failed hardware.
- *
- * Note, however, that one of the leading causes of EEH slot
- * freeze events are buggy device drivers, buggy device microcode,
- * or buggy device hardware. This is because any attempt by the
- * device to bus-master data to a memory address that is not
- * assigned to the device will trigger a slot freeze. (The idea
- * is to prevent devices-gone-wild from corrupting system memory).
- * Buggy hardware/drivers will have a miserable time co-existing
- * with EEH.
- *
- * Ideally, a PCI device driver, when suspecting that an isolation
- * event has occurred (e.g. by reading 0xff's), will then ask EEH
- * whether this is the case, and then take appropriate steps to
- * reset the PCI slot, the PCI device, and then resume operations.
- * However, until that day, the checking is done here, with the
- * eeh_check_failure() routine embedded in the MMIO macros. If
- * the slot is found to be isolated, an "EEH Event" is synthesized
- * and sent out for processing.
- */
- /* If a device driver keeps reading an MMIO register in an interrupt
- * handler after a slot isolation event, it might be broken.
- * This sets the threshold for how many read attempts we allow
- * before printing an error message.
- */
- #define EEH_MAX_FAILS 2100000
- /* Time to wait for a PCI slot to report status, in milliseconds */
- #define PCI_BUS_RESET_WAIT_MSEC (5*60*1000)
- /*
- * EEH probe mode support, which is part of the flags,
- * is to support multiple platforms for EEH. Some platforms
- * like pSeries do PCI emunation based on device tree.
- * However, other platforms like powernv probe PCI devices
- * from hardware. The flag is used to distinguish that.
- * In addition, struct eeh_ops::probe would be invoked for
- * particular OF node or PCI device so that the corresponding
- * PE would be created there.
- */
- int eeh_subsystem_flags;
- EXPORT_SYMBOL(eeh_subsystem_flags);
- /*
- * EEH allowed maximal frozen times. If one particular PE's
- * frozen count in last hour exceeds this limit, the PE will
- * be forced to be offline permanently.
- */
- int eeh_max_freezes = 5;
- /* Platform dependent EEH operations */
- struct eeh_ops *eeh_ops = NULL;
- /* Lock to avoid races due to multiple reports of an error */
- DEFINE_RAW_SPINLOCK(confirm_error_lock);
- EXPORT_SYMBOL_GPL(confirm_error_lock);
- /* Lock to protect passed flags */
- static DEFINE_MUTEX(eeh_dev_mutex);
- /* Buffer for reporting pci register dumps. Its here in BSS, and
- * not dynamically alloced, so that it ends up in RMO where RTAS
- * can access it.
- */
- #define EEH_PCI_REGS_LOG_LEN 8192
- static unsigned char pci_regs_buf[EEH_PCI_REGS_LOG_LEN];
- /*
- * The struct is used to maintain the EEH global statistic
- * information. Besides, the EEH global statistics will be
- * exported to user space through procfs
- */
- struct eeh_stats {
- u64 no_device; /* PCI device not found */
- u64 no_dn; /* OF node not found */
- u64 no_cfg_addr; /* Config address not found */
- u64 ignored_check; /* EEH check skipped */
- u64 total_mmio_ffs; /* Total EEH checks */
- u64 false_positives; /* Unnecessary EEH checks */
- u64 slot_resets; /* PE reset */
- };
- static struct eeh_stats eeh_stats;
- static int __init eeh_setup(char *str)
- {
- if (!strcmp(str, "off"))
- eeh_add_flag(EEH_FORCE_DISABLED);
- else if (!strcmp(str, "early_log"))
- eeh_add_flag(EEH_EARLY_DUMP_LOG);
- return 1;
- }
- __setup("eeh=", eeh_setup);
- /*
- * This routine captures assorted PCI configuration space data
- * for the indicated PCI device, and puts them into a buffer
- * for RTAS error logging.
- */
- static size_t eeh_dump_dev_log(struct eeh_dev *edev, char *buf, size_t len)
- {
- struct pci_dn *pdn = eeh_dev_to_pdn(edev);
- u32 cfg;
- int cap, i;
- int n = 0, l = 0;
- char buffer[128];
- n += scnprintf(buf+n, len-n, "%04x:%02x:%02x.%01x\n",
- edev->phb->global_number, pdn->busno,
- PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn));
- pr_warn("EEH: of node=%04x:%02x:%02x.%01x\n",
- edev->phb->global_number, pdn->busno,
- PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn));
- eeh_ops->read_config(pdn, PCI_VENDOR_ID, 4, &cfg);
- n += scnprintf(buf+n, len-n, "dev/vend:%08x\n", cfg);
- pr_warn("EEH: PCI device/vendor: %08x\n", cfg);
- eeh_ops->read_config(pdn, PCI_COMMAND, 4, &cfg);
- n += scnprintf(buf+n, len-n, "cmd/stat:%x\n", cfg);
- pr_warn("EEH: PCI cmd/status register: %08x\n", cfg);
- /* Gather bridge-specific registers */
- if (edev->mode & EEH_DEV_BRIDGE) {
- eeh_ops->read_config(pdn, PCI_SEC_STATUS, 2, &cfg);
- n += scnprintf(buf+n, len-n, "sec stat:%x\n", cfg);
- pr_warn("EEH: Bridge secondary status: %04x\n", cfg);
- eeh_ops->read_config(pdn, PCI_BRIDGE_CONTROL, 2, &cfg);
- n += scnprintf(buf+n, len-n, "brdg ctl:%x\n", cfg);
- pr_warn("EEH: Bridge control: %04x\n", cfg);
- }
- /* Dump out the PCI-X command and status regs */
- cap = edev->pcix_cap;
- if (cap) {
- eeh_ops->read_config(pdn, cap, 4, &cfg);
- n += scnprintf(buf+n, len-n, "pcix-cmd:%x\n", cfg);
- pr_warn("EEH: PCI-X cmd: %08x\n", cfg);
- eeh_ops->read_config(pdn, cap+4, 4, &cfg);
- n += scnprintf(buf+n, len-n, "pcix-stat:%x\n", cfg);
- pr_warn("EEH: PCI-X status: %08x\n", cfg);
- }
- /* If PCI-E capable, dump PCI-E cap 10 */
- cap = edev->pcie_cap;
- if (cap) {
- n += scnprintf(buf+n, len-n, "pci-e cap10:\n");
- pr_warn("EEH: PCI-E capabilities and status follow:\n");
- for (i=0; i<=8; i++) {
- eeh_ops->read_config(pdn, cap+4*i, 4, &cfg);
- n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg);
- if ((i % 4) == 0) {
- if (i != 0)
- pr_warn("%s\n", buffer);
- l = scnprintf(buffer, sizeof(buffer),
- "EEH: PCI-E %02x: %08x ",
- 4*i, cfg);
- } else {
- l += scnprintf(buffer+l, sizeof(buffer)-l,
- "%08x ", cfg);
- }
- }
- pr_warn("%s\n", buffer);
- }
- /* If AER capable, dump it */
- cap = edev->aer_cap;
- if (cap) {
- n += scnprintf(buf+n, len-n, "pci-e AER:\n");
- pr_warn("EEH: PCI-E AER capability register set follows:\n");
- for (i=0; i<=13; i++) {
- eeh_ops->read_config(pdn, cap+4*i, 4, &cfg);
- n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg);
- if ((i % 4) == 0) {
- if (i != 0)
- pr_warn("%s\n", buffer);
- l = scnprintf(buffer, sizeof(buffer),
- "EEH: PCI-E AER %02x: %08x ",
- 4*i, cfg);
- } else {
- l += scnprintf(buffer+l, sizeof(buffer)-l,
- "%08x ", cfg);
- }
- }
- pr_warn("%s\n", buffer);
- }
- return n;
- }
- static void *eeh_dump_pe_log(void *data, void *flag)
- {
- struct eeh_pe *pe = data;
- struct eeh_dev *edev, *tmp;
- size_t *plen = flag;
- eeh_pe_for_each_dev(pe, edev, tmp)
- *plen += eeh_dump_dev_log(edev, pci_regs_buf + *plen,
- EEH_PCI_REGS_LOG_LEN - *plen);
- return NULL;
- }
- /**
- * eeh_slot_error_detail - Generate combined log including driver log and error log
- * @pe: EEH PE
- * @severity: temporary or permanent error log
- *
- * This routine should be called to generate the combined log, which
- * is comprised of driver log and error log. The driver log is figured
- * out from the config space of the corresponding PCI device, while
- * the error log is fetched through platform dependent function call.
- */
- void eeh_slot_error_detail(struct eeh_pe *pe, int severity)
- {
- size_t loglen = 0;
- /*
- * When the PHB is fenced or dead, it's pointless to collect
- * the data from PCI config space because it should return
- * 0xFF's. For ER, we still retrieve the data from the PCI
- * config space.
- *
- * For pHyp, we have to enable IO for log retrieval. Otherwise,
- * 0xFF's is always returned from PCI config space.
- *
- * When the @severity is EEH_LOG_PERM, the PE is going to be
- * removed. Prior to that, the drivers for devices included in
- * the PE will be closed. The drivers rely on working IO path
- * to bring the devices to quiet state. Otherwise, PCI traffic
- * from those devices after they are removed is like to cause
- * another unexpected EEH error.
- */
- if (!(pe->type & EEH_PE_PHB)) {
- if (eeh_has_flag(EEH_ENABLE_IO_FOR_LOG) ||
- severity == EEH_LOG_PERM)
- eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);
- /*
- * The config space of some PCI devices can't be accessed
- * when their PEs are in frozen state. Otherwise, fenced
- * PHB might be seen. Those PEs are identified with flag
- * EEH_PE_CFG_RESTRICTED, indicating EEH_PE_CFG_BLOCKED
- * is set automatically when the PE is put to EEH_PE_ISOLATED.
- *
- * Restoring BARs possibly triggers PCI config access in
- * (OPAL) firmware and then causes fenced PHB. If the
- * PCI config is blocked with flag EEH_PE_CFG_BLOCKED, it's
- * pointless to restore BARs and dump config space.
- */
- eeh_ops->configure_bridge(pe);
- if (!(pe->state & EEH_PE_CFG_BLOCKED)) {
- eeh_pe_restore_bars(pe);
- pci_regs_buf[0] = 0;
- eeh_pe_traverse(pe, eeh_dump_pe_log, &loglen);
- }
- }
- eeh_ops->get_log(pe, severity, pci_regs_buf, loglen);
- }
- /**
- * eeh_token_to_phys - Convert EEH address token to phys address
- * @token: I/O token, should be address in the form 0xA....
- *
- * This routine should be called to convert virtual I/O address
- * to physical one.
- */
- static inline unsigned long eeh_token_to_phys(unsigned long token)
- {
- pte_t *ptep;
- unsigned long pa;
- int hugepage_shift;
- /*
- * We won't find hugepages here(this is iomem). Hence we are not
- * worried about _PAGE_SPLITTING/collapse. Also we will not hit
- * page table free, because of init_mm.
- */
- ptep = __find_linux_pte_or_hugepte(init_mm.pgd, token,
- NULL, &hugepage_shift);
- if (!ptep)
- return token;
- WARN_ON(hugepage_shift);
- pa = pte_pfn(*ptep) << PAGE_SHIFT;
- return pa | (token & (PAGE_SIZE-1));
- }
- /*
- * On PowerNV platform, we might already have fenced PHB there.
- * For that case, it's meaningless to recover frozen PE. Intead,
- * We have to handle fenced PHB firstly.
- */
- static int eeh_phb_check_failure(struct eeh_pe *pe)
- {
- struct eeh_pe *phb_pe;
- unsigned long flags;
- int ret;
- if (!eeh_has_flag(EEH_PROBE_MODE_DEV))
- return -EPERM;
- /* Find the PHB PE */
- phb_pe = eeh_phb_pe_get(pe->phb);
- if (!phb_pe) {
- pr_warn("%s Can't find PE for PHB#%d\n",
- __func__, pe->phb->global_number);
- return -EEXIST;
- }
- /* If the PHB has been in problematic state */
- eeh_serialize_lock(&flags);
- if (phb_pe->state & EEH_PE_ISOLATED) {
- ret = 0;
- goto out;
- }
- /* Check PHB state */
- ret = eeh_ops->get_state(phb_pe, NULL);
- if ((ret < 0) ||
- (ret == EEH_STATE_NOT_SUPPORT) ||
- (ret & (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE)) ==
- (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE)) {
- ret = 0;
- goto out;
- }
- /* Isolate the PHB and send event */
- eeh_pe_state_mark(phb_pe, EEH_PE_ISOLATED);
- eeh_serialize_unlock(flags);
- pr_err("EEH: PHB#%x failure detected, location: %s\n",
- phb_pe->phb->global_number, eeh_pe_loc_get(phb_pe));
- dump_stack();
- eeh_send_failure_event(phb_pe);
- return 1;
- out:
- eeh_serialize_unlock(flags);
- return ret;
- }
- /**
- * eeh_dev_check_failure - Check if all 1's data is due to EEH slot freeze
- * @edev: eeh device
- *
- * Check for an EEH failure for the given device node. Call this
- * routine if the result of a read was all 0xff's and you want to
- * find out if this is due to an EEH slot freeze. This routine
- * will query firmware for the EEH status.
- *
- * Returns 0 if there has not been an EEH error; otherwise returns
- * a non-zero value and queues up a slot isolation event notification.
- *
- * It is safe to call this routine in an interrupt context.
- */
- int eeh_dev_check_failure(struct eeh_dev *edev)
- {
- int ret;
- int active_flags = (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE);
- unsigned long flags;
- struct pci_dn *pdn;
- struct pci_dev *dev;
- struct eeh_pe *pe, *parent_pe, *phb_pe;
- int rc = 0;
- const char *location = NULL;
- eeh_stats.total_mmio_ffs++;
- if (!eeh_enabled())
- return 0;
- if (!edev) {
- eeh_stats.no_dn++;
- return 0;
- }
- dev = eeh_dev_to_pci_dev(edev);
- pe = eeh_dev_to_pe(edev);
- /* Access to IO BARs might get this far and still not want checking. */
- if (!pe) {
- eeh_stats.ignored_check++;
- pr_debug("EEH: Ignored check for %s\n",
- eeh_pci_name(dev));
- return 0;
- }
- if (!pe->addr && !pe->config_addr) {
- eeh_stats.no_cfg_addr++;
- return 0;
- }
- /*
- * On PowerNV platform, we might already have fenced PHB
- * there and we need take care of that firstly.
- */
- ret = eeh_phb_check_failure(pe);
- if (ret > 0)
- return ret;
- /*
- * If the PE isn't owned by us, we shouldn't check the
- * state. Instead, let the owner handle it if the PE has
- * been frozen.
- */
- if (eeh_pe_passed(pe))
- return 0;
- /* If we already have a pending isolation event for this
- * slot, we know it's bad already, we don't need to check.
- * Do this checking under a lock; as multiple PCI devices
- * in one slot might report errors simultaneously, and we
- * only want one error recovery routine running.
- */
- eeh_serialize_lock(&flags);
- rc = 1;
- if (pe->state & EEH_PE_ISOLATED) {
- pe->check_count++;
- if (pe->check_count % EEH_MAX_FAILS == 0) {
- pdn = eeh_dev_to_pdn(edev);
- if (pdn->node)
- location = of_get_property(pdn->node, "ibm,loc-code", NULL);
- printk(KERN_ERR "EEH: %d reads ignored for recovering device at "
- "location=%s driver=%s pci addr=%s\n",
- pe->check_count,
- location ? location : "unknown",
- eeh_driver_name(dev), eeh_pci_name(dev));
- printk(KERN_ERR "EEH: Might be infinite loop in %s driver\n",
- eeh_driver_name(dev));
- dump_stack();
- }
- goto dn_unlock;
- }
- /*
- * Now test for an EEH failure. This is VERY expensive.
- * Note that the eeh_config_addr may be a parent device
- * in the case of a device behind a bridge, or it may be
- * function zero of a multi-function device.
- * In any case they must share a common PHB.
- */
- ret = eeh_ops->get_state(pe, NULL);
- /* Note that config-io to empty slots may fail;
- * they are empty when they don't have children.
- * We will punt with the following conditions: Failure to get
- * PE's state, EEH not support and Permanently unavailable
- * state, PE is in good state.
- */
- if ((ret < 0) ||
- (ret == EEH_STATE_NOT_SUPPORT) ||
- ((ret & active_flags) == active_flags)) {
- eeh_stats.false_positives++;
- pe->false_positives++;
- rc = 0;
- goto dn_unlock;
- }
- /*
- * It should be corner case that the parent PE has been
- * put into frozen state as well. We should take care
- * that at first.
- */
- parent_pe = pe->parent;
- while (parent_pe) {
- /* Hit the ceiling ? */
- if (parent_pe->type & EEH_PE_PHB)
- break;
- /* Frozen parent PE ? */
- ret = eeh_ops->get_state(parent_pe, NULL);
- if (ret > 0 &&
- (ret & active_flags) != active_flags)
- pe = parent_pe;
- /* Next parent level */
- parent_pe = parent_pe->parent;
- }
- eeh_stats.slot_resets++;
- /* Avoid repeated reports of this failure, including problems
- * with other functions on this device, and functions under
- * bridges.
- */
- eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
- eeh_serialize_unlock(flags);
- /* Most EEH events are due to device driver bugs. Having
- * a stack trace will help the device-driver authors figure
- * out what happened. So print that out.
- */
- phb_pe = eeh_phb_pe_get(pe->phb);
- pr_err("EEH: Frozen PHB#%x-PE#%x detected\n",
- pe->phb->global_number, pe->addr);
- pr_err("EEH: PE location: %s, PHB location: %s\n",
- eeh_pe_loc_get(pe), eeh_pe_loc_get(phb_pe));
- dump_stack();
- eeh_send_failure_event(pe);
- return 1;
- dn_unlock:
- eeh_serialize_unlock(flags);
- return rc;
- }
- EXPORT_SYMBOL_GPL(eeh_dev_check_failure);
- /**
- * eeh_check_failure - Check if all 1's data is due to EEH slot freeze
- * @token: I/O address
- *
- * Check for an EEH failure at the given I/O address. Call this
- * routine if the result of a read was all 0xff's and you want to
- * find out if this is due to an EEH slot freeze event. This routine
- * will query firmware for the EEH status.
- *
- * Note this routine is safe to call in an interrupt context.
- */
- int eeh_check_failure(const volatile void __iomem *token)
- {
- unsigned long addr;
- struct eeh_dev *edev;
- /* Finding the phys addr + pci device; this is pretty quick. */
- addr = eeh_token_to_phys((unsigned long __force) token);
- edev = eeh_addr_cache_get_dev(addr);
- if (!edev) {
- eeh_stats.no_device++;
- return 0;
- }
- return eeh_dev_check_failure(edev);
- }
- EXPORT_SYMBOL(eeh_check_failure);
- /**
- * eeh_pci_enable - Enable MMIO or DMA transfers for this slot
- * @pe: EEH PE
- *
- * This routine should be called to reenable frozen MMIO or DMA
- * so that it would work correctly again. It's useful while doing
- * recovery or log collection on the indicated device.
- */
- int eeh_pci_enable(struct eeh_pe *pe, int function)
- {
- int active_flag, rc;
- /*
- * pHyp doesn't allow to enable IO or DMA on unfrozen PE.
- * Also, it's pointless to enable them on unfrozen PE. So
- * we have to check before enabling IO or DMA.
- */
- switch (function) {
- case EEH_OPT_THAW_MMIO:
- active_flag = EEH_STATE_MMIO_ACTIVE | EEH_STATE_MMIO_ENABLED;
- break;
- case EEH_OPT_THAW_DMA:
- active_flag = EEH_STATE_DMA_ACTIVE;
- break;
- case EEH_OPT_DISABLE:
- case EEH_OPT_ENABLE:
- case EEH_OPT_FREEZE_PE:
- active_flag = 0;
- break;
- default:
- pr_warn("%s: Invalid function %d\n",
- __func__, function);
- return -EINVAL;
- }
- /*
- * Check if IO or DMA has been enabled before
- * enabling them.
- */
- if (active_flag) {
- rc = eeh_ops->get_state(pe, NULL);
- if (rc < 0)
- return rc;
- /* Needn't enable it at all */
- if (rc == EEH_STATE_NOT_SUPPORT)
- return 0;
- /* It's already enabled */
- if (rc & active_flag)
- return 0;
- }
- /* Issue the request */
- rc = eeh_ops->set_option(pe, function);
- if (rc)
- pr_warn("%s: Unexpected state change %d on "
- "PHB#%d-PE#%x, err=%d\n",
- __func__, function, pe->phb->global_number,
- pe->addr, rc);
- /* Check if the request is finished successfully */
- if (active_flag) {
- rc = eeh_ops->wait_state(pe, PCI_BUS_RESET_WAIT_MSEC);
- if (rc < 0)
- return rc;
- if (rc & active_flag)
- return 0;
- return -EIO;
- }
- return rc;
- }
- static void *eeh_disable_and_save_dev_state(void *data, void *userdata)
- {
- struct eeh_dev *edev = data;
- struct pci_dev *pdev = eeh_dev_to_pci_dev(edev);
- struct pci_dev *dev = userdata;
- /*
- * The caller should have disabled and saved the
- * state for the specified device
- */
- if (!pdev || pdev == dev)
- return NULL;
- /* Ensure we have D0 power state */
- pci_set_power_state(pdev, PCI_D0);
- /* Save device state */
- pci_save_state(pdev);
- /*
- * Disable device to avoid any DMA traffic and
- * interrupt from the device
- */
- pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
- return NULL;
- }
- static void *eeh_restore_dev_state(void *data, void *userdata)
- {
- struct eeh_dev *edev = data;
- struct pci_dn *pdn = eeh_dev_to_pdn(edev);
- struct pci_dev *pdev = eeh_dev_to_pci_dev(edev);
- struct pci_dev *dev = userdata;
- if (!pdev)
- return NULL;
- /* Apply customization from firmware */
- if (pdn && eeh_ops->restore_config)
- eeh_ops->restore_config(pdn);
- /* The caller should restore state for the specified device */
- if (pdev != dev)
- pci_restore_state(pdev);
- return NULL;
- }
- /**
- * pcibios_set_pcie_reset_state - Set PCI-E reset state
- * @dev: pci device struct
- * @state: reset state to enter
- *
- * Return value:
- * 0 if success
- */
- int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
- {
- struct eeh_dev *edev = pci_dev_to_eeh_dev(dev);
- struct eeh_pe *pe = eeh_dev_to_pe(edev);
- if (!pe) {
- pr_err("%s: No PE found on PCI device %s\n",
- __func__, pci_name(dev));
- return -EINVAL;
- }
- switch (state) {
- case pcie_deassert_reset:
- eeh_ops->reset(pe, EEH_RESET_DEACTIVATE);
- eeh_unfreeze_pe(pe, false);
- if (!(pe->type & EEH_PE_VF))
- eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED);
- eeh_pe_dev_traverse(pe, eeh_restore_dev_state, dev);
- eeh_pe_state_clear(pe, EEH_PE_ISOLATED);
- break;
- case pcie_hot_reset:
- eeh_pe_state_mark_with_cfg(pe, EEH_PE_ISOLATED);
- eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE);
- eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev);
- if (!(pe->type & EEH_PE_VF))
- eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED);
- eeh_ops->reset(pe, EEH_RESET_HOT);
- break;
- case pcie_warm_reset:
- eeh_pe_state_mark_with_cfg(pe, EEH_PE_ISOLATED);
- eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE);
- eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev);
- if (!(pe->type & EEH_PE_VF))
- eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED);
- eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL);
- break;
- default:
- eeh_pe_state_clear(pe, EEH_PE_ISOLATED | EEH_PE_CFG_BLOCKED);
- return -EINVAL;
- };
- return 0;
- }
- /**
- * eeh_set_pe_freset - Check the required reset for the indicated device
- * @data: EEH device
- * @flag: return value
- *
- * Each device might have its preferred reset type: fundamental or
- * hot reset. The routine is used to collected the information for
- * the indicated device and its children so that the bunch of the
- * devices could be reset properly.
- */
- static void *eeh_set_dev_freset(void *data, void *flag)
- {
- struct pci_dev *dev;
- unsigned int *freset = (unsigned int *)flag;
- struct eeh_dev *edev = (struct eeh_dev *)data;
- dev = eeh_dev_to_pci_dev(edev);
- if (dev)
- *freset |= dev->needs_freset;
- return NULL;
- }
- /**
- * eeh_reset_pe_once - Assert the pci #RST line for 1/4 second
- * @pe: EEH PE
- *
- * Assert the PCI #RST line for 1/4 second.
- */
- static void eeh_reset_pe_once(struct eeh_pe *pe)
- {
- unsigned int freset = 0;
- /* Determine type of EEH reset required for
- * Partitionable Endpoint, a hot-reset (1)
- * or a fundamental reset (3).
- * A fundamental reset required by any device under
- * Partitionable Endpoint trumps hot-reset.
- */
- eeh_pe_dev_traverse(pe, eeh_set_dev_freset, &freset);
- if (freset)
- eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL);
- else
- eeh_ops->reset(pe, EEH_RESET_HOT);
- eeh_ops->reset(pe, EEH_RESET_DEACTIVATE);
- }
- /**
- * eeh_reset_pe - Reset the indicated PE
- * @pe: EEH PE
- *
- * This routine should be called to reset indicated device, including
- * PE. A PE might include multiple PCI devices and sometimes PCI bridges
- * might be involved as well.
- */
- int eeh_reset_pe(struct eeh_pe *pe)
- {
- int flags = (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE);
- int i, state, ret;
- /* Mark as reset and block config space */
- eeh_pe_state_mark(pe, EEH_PE_RESET | EEH_PE_CFG_BLOCKED);
- /* Take three shots at resetting the bus */
- for (i = 0; i < 3; i++) {
- eeh_reset_pe_once(pe);
- /*
- * EEH_PE_ISOLATED is expected to be removed after
- * BAR restore.
- */
- state = eeh_ops->wait_state(pe, PCI_BUS_RESET_WAIT_MSEC);
- if ((state & flags) == flags) {
- ret = 0;
- goto out;
- }
- if (state < 0) {
- pr_warn("%s: Unrecoverable slot failure on PHB#%d-PE#%x",
- __func__, pe->phb->global_number, pe->addr);
- ret = -ENOTRECOVERABLE;
- goto out;
- }
- /* We might run out of credits */
- ret = -EIO;
- pr_warn("%s: Failure %d resetting PHB#%x-PE#%x\n (%d)\n",
- __func__, state, pe->phb->global_number, pe->addr, (i + 1));
- }
- out:
- eeh_pe_state_clear(pe, EEH_PE_RESET | EEH_PE_CFG_BLOCKED);
- return ret;
- }
- /**
- * eeh_save_bars - Save device bars
- * @edev: PCI device associated EEH device
- *
- * Save the values of the device bars. Unlike the restore
- * routine, this routine is *not* recursive. This is because
- * PCI devices are added individually; but, for the restore,
- * an entire slot is reset at a time.
- */
- void eeh_save_bars(struct eeh_dev *edev)
- {
- struct pci_dn *pdn;
- int i;
- pdn = eeh_dev_to_pdn(edev);
- if (!pdn)
- return;
- for (i = 0; i < 16; i++)
- eeh_ops->read_config(pdn, i * 4, 4, &edev->config_space[i]);
- /*
- * For PCI bridges including root port, we need enable bus
- * master explicitly. Otherwise, it can't fetch IODA table
- * entries correctly. So we cache the bit in advance so that
- * we can restore it after reset, either PHB range or PE range.
- */
- if (edev->mode & EEH_DEV_BRIDGE)
- edev->config_space[1] |= PCI_COMMAND_MASTER;
- }
- /**
- * eeh_ops_register - Register platform dependent EEH operations
- * @ops: platform dependent EEH operations
- *
- * Register the platform dependent EEH operation callback
- * functions. The platform should call this function before
- * any other EEH operations.
- */
- int __init eeh_ops_register(struct eeh_ops *ops)
- {
- if (!ops->name) {
- pr_warn("%s: Invalid EEH ops name for %p\n",
- __func__, ops);
- return -EINVAL;
- }
- if (eeh_ops && eeh_ops != ops) {
- pr_warn("%s: EEH ops of platform %s already existing (%s)\n",
- __func__, eeh_ops->name, ops->name);
- return -EEXIST;
- }
- eeh_ops = ops;
- return 0;
- }
- /**
- * eeh_ops_unregister - Unreigster platform dependent EEH operations
- * @name: name of EEH platform operations
- *
- * Unregister the platform dependent EEH operation callback
- * functions.
- */
- int __exit eeh_ops_unregister(const char *name)
- {
- if (!name || !strlen(name)) {
- pr_warn("%s: Invalid EEH ops name\n",
- __func__);
- return -EINVAL;
- }
- if (eeh_ops && !strcmp(eeh_ops->name, name)) {
- eeh_ops = NULL;
- return 0;
- }
- return -EEXIST;
- }
- static int eeh_reboot_notifier(struct notifier_block *nb,
- unsigned long action, void *unused)
- {
- eeh_clear_flag(EEH_ENABLED);
- return NOTIFY_DONE;
- }
- static struct notifier_block eeh_reboot_nb = {
- .notifier_call = eeh_reboot_notifier,
- };
- /**
- * eeh_init - EEH initialization
- *
- * Initialize EEH by trying to enable it for all of the adapters in the system.
- * As a side effect we can determine here if eeh is supported at all.
- * Note that we leave EEH on so failed config cycles won't cause a machine
- * check. If a user turns off EEH for a particular adapter they are really
- * telling Linux to ignore errors. Some hardware (e.g. POWER5) won't
- * grant access to a slot if EEH isn't enabled, and so we always enable
- * EEH for all slots/all devices.
- *
- * The eeh-force-off option disables EEH checking globally, for all slots.
- * Even if force-off is set, the EEH hardware is still enabled, so that
- * newer systems can boot.
- */
- int eeh_init(void)
- {
- struct pci_controller *hose, *tmp;
- struct pci_dn *pdn;
- static int cnt = 0;
- int ret = 0;
- /*
- * We have to delay the initialization on PowerNV after
- * the PCI hierarchy tree has been built because the PEs
- * are figured out based on PCI devices instead of device
- * tree nodes
- */
- if (machine_is(powernv) && cnt++ <= 0)
- return ret;
- /* Register reboot notifier */
- ret = register_reboot_notifier(&eeh_reboot_nb);
- if (ret) {
- pr_warn("%s: Failed to register notifier (%d)\n",
- __func__, ret);
- return ret;
- }
- /* call platform initialization function */
- if (!eeh_ops) {
- pr_warn("%s: Platform EEH operation not found\n",
- __func__);
- return -EEXIST;
- } else if ((ret = eeh_ops->init()))
- return ret;
- /* Initialize EEH event */
- ret = eeh_event_init();
- if (ret)
- return ret;
- /* Enable EEH for all adapters */
- list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
- pdn = hose->pci_data;
- traverse_pci_dn(pdn, eeh_ops->probe, NULL);
- }
- /*
- * Call platform post-initialization. Actually, It's good chance
- * to inform platform that EEH is ready to supply service if the
- * I/O cache stuff has been built up.
- */
- if (eeh_ops->post_init) {
- ret = eeh_ops->post_init();
- if (ret)
- return ret;
- }
- if (eeh_enabled())
- pr_info("EEH: PCI Enhanced I/O Error Handling Enabled\n");
- else
- pr_info("EEH: No capable adapters found\n");
- return ret;
- }
- core_initcall_sync(eeh_init);
- /**
- * eeh_add_device_early - Enable EEH for the indicated device node
- * @pdn: PCI device node for which to set up EEH
- *
- * This routine must be used to perform EEH initialization for PCI
- * devices that were added after system boot (e.g. hotplug, dlpar).
- * This routine must be called before any i/o is performed to the
- * adapter (inluding any config-space i/o).
- * Whether this actually enables EEH or not for this device depends
- * on the CEC architecture, type of the device, on earlier boot
- * command-line arguments & etc.
- */
- void eeh_add_device_early(struct pci_dn *pdn)
- {
- struct pci_controller *phb;
- struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
- if (!edev)
- return;
- if (!eeh_has_flag(EEH_PROBE_MODE_DEVTREE))
- return;
- /* USB Bus children of PCI devices will not have BUID's */
- phb = edev->phb;
- if (NULL == phb ||
- (eeh_has_flag(EEH_PROBE_MODE_DEVTREE) && 0 == phb->buid))
- return;
- eeh_ops->probe(pdn, NULL);
- }
- /**
- * eeh_add_device_tree_early - Enable EEH for the indicated device
- * @pdn: PCI device node
- *
- * This routine must be used to perform EEH initialization for the
- * indicated PCI device that was added after system boot (e.g.
- * hotplug, dlpar).
- */
- void eeh_add_device_tree_early(struct pci_dn *pdn)
- {
- struct pci_dn *n;
- if (!pdn)
- return;
- list_for_each_entry(n, &pdn->child_list, list)
- eeh_add_device_tree_early(n);
- eeh_add_device_early(pdn);
- }
- EXPORT_SYMBOL_GPL(eeh_add_device_tree_early);
- /**
- * eeh_add_device_late - Perform EEH initialization for the indicated pci device
- * @dev: pci device for which to set up EEH
- *
- * This routine must be used to complete EEH initialization for PCI
- * devices that were added after system boot (e.g. hotplug, dlpar).
- */
- void eeh_add_device_late(struct pci_dev *dev)
- {
- struct pci_dn *pdn;
- struct eeh_dev *edev;
- if (!dev || !eeh_enabled())
- return;
- pr_debug("EEH: Adding device %s\n", pci_name(dev));
- pdn = pci_get_pdn_by_devfn(dev->bus, dev->devfn);
- edev = pdn_to_eeh_dev(pdn);
- if (edev->pdev == dev) {
- pr_debug("EEH: Already referenced !\n");
- return;
- }
- /*
- * The EEH cache might not be removed correctly because of
- * unbalanced kref to the device during unplug time, which
- * relies on pcibios_release_device(). So we have to remove
- * that here explicitly.
- */
- if (edev->pdev) {
- eeh_rmv_from_parent_pe(edev);
- eeh_addr_cache_rmv_dev(edev->pdev);
- eeh_sysfs_remove_device(edev->pdev);
- edev->mode &= ~EEH_DEV_SYSFS;
- /*
- * We definitely should have the PCI device removed
- * though it wasn't correctly. So we needn't call
- * into error handler afterwards.
- */
- edev->mode |= EEH_DEV_NO_HANDLER;
- edev->pdev = NULL;
- dev->dev.archdata.edev = NULL;
- }
- if (eeh_has_flag(EEH_PROBE_MODE_DEV))
- eeh_ops->probe(pdn, NULL);
- edev->pdev = dev;
- dev->dev.archdata.edev = edev;
- eeh_addr_cache_insert_dev(dev);
- }
- /**
- * eeh_add_device_tree_late - Perform EEH initialization for the indicated PCI bus
- * @bus: PCI bus
- *
- * This routine must be used to perform EEH initialization for PCI
- * devices which are attached to the indicated PCI bus. The PCI bus
- * is added after system boot through hotplug or dlpar.
- */
- void eeh_add_device_tree_late(struct pci_bus *bus)
- {
- struct pci_dev *dev;
- list_for_each_entry(dev, &bus->devices, bus_list) {
- eeh_add_device_late(dev);
- if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
- struct pci_bus *subbus = dev->subordinate;
- if (subbus)
- eeh_add_device_tree_late(subbus);
- }
- }
- }
- EXPORT_SYMBOL_GPL(eeh_add_device_tree_late);
- /**
- * eeh_add_sysfs_files - Add EEH sysfs files for the indicated PCI bus
- * @bus: PCI bus
- *
- * This routine must be used to add EEH sysfs files for PCI
- * devices which are attached to the indicated PCI bus. The PCI bus
- * is added after system boot through hotplug or dlpar.
- */
- void eeh_add_sysfs_files(struct pci_bus *bus)
- {
- struct pci_dev *dev;
- list_for_each_entry(dev, &bus->devices, bus_list) {
- eeh_sysfs_add_device(dev);
- if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
- struct pci_bus *subbus = dev->subordinate;
- if (subbus)
- eeh_add_sysfs_files(subbus);
- }
- }
- }
- EXPORT_SYMBOL_GPL(eeh_add_sysfs_files);
- /**
- * eeh_remove_device - Undo EEH setup for the indicated pci device
- * @dev: pci device to be removed
- *
- * This routine should be called when a device is removed from
- * a running system (e.g. by hotplug or dlpar). It unregisters
- * the PCI device from the EEH subsystem. I/O errors affecting
- * this device will no longer be detected after this call; thus,
- * i/o errors affecting this slot may leave this device unusable.
- */
- void eeh_remove_device(struct pci_dev *dev)
- {
- struct eeh_dev *edev;
- if (!dev || !eeh_enabled())
- return;
- edev = pci_dev_to_eeh_dev(dev);
- /* Unregister the device with the EEH/PCI address search system */
- pr_debug("EEH: Removing device %s\n", pci_name(dev));
- if (!edev || !edev->pdev || !edev->pe) {
- pr_debug("EEH: Not referenced !\n");
- return;
- }
- /*
- * During the hotplug for EEH error recovery, we need the EEH
- * device attached to the parent PE in order for BAR restore
- * a bit later. So we keep it for BAR restore and remove it
- * from the parent PE during the BAR resotre.
- */
- edev->pdev = NULL;
- /*
- * The flag "in_error" is used to trace EEH devices for VFs
- * in error state or not. It's set in eeh_report_error(). If
- * it's not set, eeh_report_{reset,resume}() won't be called
- * for the VF EEH device.
- */
- edev->in_error = false;
- dev->dev.archdata.edev = NULL;
- if (!(edev->pe->state & EEH_PE_KEEP))
- eeh_rmv_from_parent_pe(edev);
- else
- edev->mode |= EEH_DEV_DISCONNECTED;
- /*
- * We're removing from the PCI subsystem, that means
- * the PCI device driver can't support EEH or not
- * well. So we rely on hotplug completely to do recovery
- * for the specific PCI device.
- */
- edev->mode |= EEH_DEV_NO_HANDLER;
- eeh_addr_cache_rmv_dev(dev);
- eeh_sysfs_remove_device(dev);
- edev->mode &= ~EEH_DEV_SYSFS;
- }
- int eeh_unfreeze_pe(struct eeh_pe *pe, bool sw_state)
- {
- int ret;
- ret = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);
- if (ret) {
- pr_warn("%s: Failure %d enabling IO on PHB#%x-PE#%x\n",
- __func__, ret, pe->phb->global_number, pe->addr);
- return ret;
- }
- ret = eeh_pci_enable(pe, EEH_OPT_THAW_DMA);
- if (ret) {
- pr_warn("%s: Failure %d enabling DMA on PHB#%x-PE#%x\n",
- __func__, ret, pe->phb->global_number, pe->addr);
- return ret;
- }
- /* Clear software isolated state */
- if (sw_state && (pe->state & EEH_PE_ISOLATED))
- eeh_pe_state_clear(pe, EEH_PE_ISOLATED);
- return ret;
- }
- static struct pci_device_id eeh_reset_ids[] = {
- { PCI_DEVICE(0x19a2, 0x0710) }, /* Emulex, BE */
- { PCI_DEVICE(0x10df, 0xe220) }, /* Emulex, Lancer */
- { PCI_DEVICE(0x14e4, 0x1657) }, /* Broadcom BCM5719 */
- { 0 }
- };
- static int eeh_pe_change_owner(struct eeh_pe *pe)
- {
- struct eeh_dev *edev, *tmp;
- struct pci_dev *pdev;
- struct pci_device_id *id;
- int flags, ret;
- /* Check PE state */
- flags = (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE);
- ret = eeh_ops->get_state(pe, NULL);
- if (ret < 0 || ret == EEH_STATE_NOT_SUPPORT)
- return 0;
- /* Unfrozen PE, nothing to do */
- if ((ret & flags) == flags)
- return 0;
- /* Frozen PE, check if it needs PE level reset */
- eeh_pe_for_each_dev(pe, edev, tmp) {
- pdev = eeh_dev_to_pci_dev(edev);
- if (!pdev)
- continue;
- for (id = &eeh_reset_ids[0]; id->vendor != 0; id++) {
- if (id->vendor != PCI_ANY_ID &&
- id->vendor != pdev->vendor)
- continue;
- if (id->device != PCI_ANY_ID &&
- id->device != pdev->device)
- continue;
- if (id->subvendor != PCI_ANY_ID &&
- id->subvendor != pdev->subsystem_vendor)
- continue;
- if (id->subdevice != PCI_ANY_ID &&
- id->subdevice != pdev->subsystem_device)
- continue;
- return eeh_pe_reset_and_recover(pe);
- }
- }
- return eeh_unfreeze_pe(pe, true);
- }
- /**
- * eeh_dev_open - Increase count of pass through devices for PE
- * @pdev: PCI device
- *
- * Increase count of passed through devices for the indicated
- * PE. In the result, the EEH errors detected on the PE won't be
- * reported. The PE owner will be responsible for detection
- * and recovery.
- */
- int eeh_dev_open(struct pci_dev *pdev)
- {
- struct eeh_dev *edev;
- int ret = -ENODEV;
- mutex_lock(&eeh_dev_mutex);
- /* No PCI device ? */
- if (!pdev)
- goto out;
- /* No EEH device or PE ? */
- edev = pci_dev_to_eeh_dev(pdev);
- if (!edev || !edev->pe)
- goto out;
- /*
- * The PE might have been put into frozen state, but we
- * didn't detect that yet. The passed through PCI devices
- * in frozen PE won't work properly. Clear the frozen state
- * in advance.
- */
- ret = eeh_pe_change_owner(edev->pe);
- if (ret)
- goto out;
- /* Increase PE's pass through count */
- atomic_inc(&edev->pe->pass_dev_cnt);
- mutex_unlock(&eeh_dev_mutex);
- return 0;
- out:
- mutex_unlock(&eeh_dev_mutex);
- return ret;
- }
- EXPORT_SYMBOL_GPL(eeh_dev_open);
- /**
- * eeh_dev_release - Decrease count of pass through devices for PE
- * @pdev: PCI device
- *
- * Decrease count of pass through devices for the indicated PE. If
- * there is no passed through device in PE, the EEH errors detected
- * on the PE will be reported and handled as usual.
- */
- void eeh_dev_release(struct pci_dev *pdev)
- {
- struct eeh_dev *edev;
- mutex_lock(&eeh_dev_mutex);
- /* No PCI device ? */
- if (!pdev)
- goto out;
- /* No EEH device ? */
- edev = pci_dev_to_eeh_dev(pdev);
- if (!edev || !edev->pe || !eeh_pe_passed(edev->pe))
- goto out;
- /* Decrease PE's pass through count */
- WARN_ON(atomic_dec_if_positive(&edev->pe->pass_dev_cnt) < 0);
- eeh_pe_change_owner(edev->pe);
- out:
- mutex_unlock(&eeh_dev_mutex);
- }
- EXPORT_SYMBOL(eeh_dev_release);
- #ifdef CONFIG_IOMMU_API
- static int dev_has_iommu_table(struct device *dev, void *data)
- {
- struct pci_dev *pdev = to_pci_dev(dev);
- struct pci_dev **ppdev = data;
- if (!dev)
- return 0;
- if (dev->iommu_group) {
- *ppdev = pdev;
- return 1;
- }
- return 0;
- }
- /**
- * eeh_iommu_group_to_pe - Convert IOMMU group to EEH PE
- * @group: IOMMU group
- *
- * The routine is called to convert IOMMU group to EEH PE.
- */
- struct eeh_pe *eeh_iommu_group_to_pe(struct iommu_group *group)
- {
- struct pci_dev *pdev = NULL;
- struct eeh_dev *edev;
- int ret;
- /* No IOMMU group ? */
- if (!group)
- return NULL;
- ret = iommu_group_for_each_dev(group, &pdev, dev_has_iommu_table);
- if (!ret || !pdev)
- return NULL;
- /* No EEH device or PE ? */
- edev = pci_dev_to_eeh_dev(pdev);
- if (!edev || !edev->pe)
- return NULL;
- return edev->pe;
- }
- EXPORT_SYMBOL_GPL(eeh_iommu_group_to_pe);
- #endif /* CONFIG_IOMMU_API */
- /**
- * eeh_pe_set_option - Set options for the indicated PE
- * @pe: EEH PE
- * @option: requested option
- *
- * The routine is called to enable or disable EEH functionality
- * on the indicated PE, to enable IO or DMA for the frozen PE.
- */
- int eeh_pe_set_option(struct eeh_pe *pe, int option)
- {
- int ret = 0;
- /* Invalid PE ? */
- if (!pe)
- return -ENODEV;
- /*
- * EEH functionality could possibly be disabled, just
- * return error for the case. And the EEH functinality
- * isn't expected to be disabled on one specific PE.
- */
- switch (option) {
- case EEH_OPT_ENABLE:
- if (eeh_enabled()) {
- ret = eeh_pe_change_owner(pe);
- break;
- }
- ret = -EIO;
- break;
- case EEH_OPT_DISABLE:
- break;
- case EEH_OPT_THAW_MMIO:
- case EEH_OPT_THAW_DMA:
- case EEH_OPT_FREEZE_PE:
- if (!eeh_ops || !eeh_ops->set_option) {
- ret = -ENOENT;
- break;
- }
- ret = eeh_pci_enable(pe, option);
- break;
- default:
- pr_debug("%s: Option %d out of range (%d, %d)\n",
- __func__, option, EEH_OPT_DISABLE, EEH_OPT_THAW_DMA);
- ret = -EINVAL;
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(eeh_pe_set_option);
- /**
- * eeh_pe_get_state - Retrieve PE's state
- * @pe: EEH PE
- *
- * Retrieve the PE's state, which includes 3 aspects: enabled
- * DMA, enabled IO and asserted reset.
- */
- int eeh_pe_get_state(struct eeh_pe *pe)
- {
- int result, ret = 0;
- bool rst_active, dma_en, mmio_en;
- /* Existing PE ? */
- if (!pe)
- return -ENODEV;
- if (!eeh_ops || !eeh_ops->get_state)
- return -ENOENT;
- /*
- * If the parent PE is owned by the host kernel and is undergoing
- * error recovery, we should return the PE state as temporarily
- * unavailable so that the error recovery on the guest is suspended
- * until the recovery completes on the host.
- */
- if (pe->parent &&
- !(pe->state & EEH_PE_REMOVED) &&
- (pe->parent->state & (EEH_PE_ISOLATED | EEH_PE_RECOVERING)))
- return EEH_PE_STATE_UNAVAIL;
- result = eeh_ops->get_state(pe, NULL);
- rst_active = !!(result & EEH_STATE_RESET_ACTIVE);
- dma_en = !!(result & EEH_STATE_DMA_ENABLED);
- mmio_en = !!(result & EEH_STATE_MMIO_ENABLED);
- if (rst_active)
- ret = EEH_PE_STATE_RESET;
- else if (dma_en && mmio_en)
- ret = EEH_PE_STATE_NORMAL;
- else if (!dma_en && !mmio_en)
- ret = EEH_PE_STATE_STOPPED_IO_DMA;
- else if (!dma_en && mmio_en)
- ret = EEH_PE_STATE_STOPPED_DMA;
- else
- ret = EEH_PE_STATE_UNAVAIL;
- return ret;
- }
- EXPORT_SYMBOL_GPL(eeh_pe_get_state);
- static int eeh_pe_reenable_devices(struct eeh_pe *pe)
- {
- struct eeh_dev *edev, *tmp;
- struct pci_dev *pdev;
- int ret = 0;
- /* Restore config space */
- eeh_pe_restore_bars(pe);
- /*
- * Reenable PCI devices as the devices passed
- * through are always enabled before the reset.
- */
- eeh_pe_for_each_dev(pe, edev, tmp) {
- pdev = eeh_dev_to_pci_dev(edev);
- if (!pdev)
- continue;
- ret = pci_reenable_device(pdev);
- if (ret) {
- pr_warn("%s: Failure %d reenabling %s\n",
- __func__, ret, pci_name(pdev));
- return ret;
- }
- }
- /* The PE is still in frozen state */
- return eeh_unfreeze_pe(pe, true);
- }
- /**
- * eeh_pe_reset - Issue PE reset according to specified type
- * @pe: EEH PE
- * @option: reset type
- *
- * The routine is called to reset the specified PE with the
- * indicated type, either fundamental reset or hot reset.
- * PE reset is the most important part for error recovery.
- */
- int eeh_pe_reset(struct eeh_pe *pe, int option)
- {
- int ret = 0;
- /* Invalid PE ? */
- if (!pe)
- return -ENODEV;
- if (!eeh_ops || !eeh_ops->set_option || !eeh_ops->reset)
- return -ENOENT;
- switch (option) {
- case EEH_RESET_DEACTIVATE:
- ret = eeh_ops->reset(pe, option);
- eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED);
- if (ret)
- break;
- ret = eeh_pe_reenable_devices(pe);
- break;
- case EEH_RESET_HOT:
- case EEH_RESET_FUNDAMENTAL:
- /*
- * Proactively freeze the PE to drop all MMIO access
- * during reset, which should be banned as it's always
- * cause recursive EEH error.
- */
- eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE);
- eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED);
- ret = eeh_ops->reset(pe, option);
- break;
- default:
- pr_debug("%s: Unsupported option %d\n",
- __func__, option);
- ret = -EINVAL;
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(eeh_pe_reset);
- /**
- * eeh_pe_configure - Configure PCI bridges after PE reset
- * @pe: EEH PE
- *
- * The routine is called to restore the PCI config space for
- * those PCI devices, especially PCI bridges affected by PE
- * reset issued previously.
- */
- int eeh_pe_configure(struct eeh_pe *pe)
- {
- int ret = 0;
- /* Invalid PE ? */
- if (!pe)
- return -ENODEV;
- return ret;
- }
- EXPORT_SYMBOL_GPL(eeh_pe_configure);
- /**
- * eeh_pe_inject_err - Injecting the specified PCI error to the indicated PE
- * @pe: the indicated PE
- * @type: error type
- * @function: error function
- * @addr: address
- * @mask: address mask
- *
- * The routine is called to inject the specified PCI error, which
- * is determined by @type and @function, to the indicated PE for
- * testing purpose.
- */
- int eeh_pe_inject_err(struct eeh_pe *pe, int type, int func,
- unsigned long addr, unsigned long mask)
- {
- /* Invalid PE ? */
- if (!pe)
- return -ENODEV;
- /* Unsupported operation ? */
- if (!eeh_ops || !eeh_ops->err_inject)
- return -ENOENT;
- /* Check on PCI error type */
- if (type != EEH_ERR_TYPE_32 && type != EEH_ERR_TYPE_64)
- return -EINVAL;
- /* Check on PCI error function */
- if (func < EEH_ERR_FUNC_MIN || func > EEH_ERR_FUNC_MAX)
- return -EINVAL;
- return eeh_ops->err_inject(pe, type, func, addr, mask);
- }
- EXPORT_SYMBOL_GPL(eeh_pe_inject_err);
- static int proc_eeh_show(struct seq_file *m, void *v)
- {
- if (!eeh_enabled()) {
- seq_printf(m, "EEH Subsystem is globally disabled\n");
- seq_printf(m, "eeh_total_mmio_ffs=%llu\n", eeh_stats.total_mmio_ffs);
- } else {
- seq_printf(m, "EEH Subsystem is enabled\n");
- seq_printf(m,
- "no device=%llu\n"
- "no device node=%llu\n"
- "no config address=%llu\n"
- "check not wanted=%llu\n"
- "eeh_total_mmio_ffs=%llu\n"
- "eeh_false_positives=%llu\n"
- "eeh_slot_resets=%llu\n",
- eeh_stats.no_device,
- eeh_stats.no_dn,
- eeh_stats.no_cfg_addr,
- eeh_stats.ignored_check,
- eeh_stats.total_mmio_ffs,
- eeh_stats.false_positives,
- eeh_stats.slot_resets);
- }
- return 0;
- }
- static int proc_eeh_open(struct inode *inode, struct file *file)
- {
- return single_open(file, proc_eeh_show, NULL);
- }
- static const struct file_operations proc_eeh_operations = {
- .open = proc_eeh_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
- };
- #ifdef CONFIG_DEBUG_FS
- static int eeh_enable_dbgfs_set(void *data, u64 val)
- {
- if (val)
- eeh_clear_flag(EEH_FORCE_DISABLED);
- else
- eeh_add_flag(EEH_FORCE_DISABLED);
- /* Notify the backend */
- if (eeh_ops->post_init)
- eeh_ops->post_init();
- return 0;
- }
- static int eeh_enable_dbgfs_get(void *data, u64 *val)
- {
- if (eeh_enabled())
- *val = 0x1ul;
- else
- *val = 0x0ul;
- return 0;
- }
- static int eeh_freeze_dbgfs_set(void *data, u64 val)
- {
- eeh_max_freezes = val;
- return 0;
- }
- static int eeh_freeze_dbgfs_get(void *data, u64 *val)
- {
- *val = eeh_max_freezes;
- return 0;
- }
- DEFINE_SIMPLE_ATTRIBUTE(eeh_enable_dbgfs_ops, eeh_enable_dbgfs_get,
- eeh_enable_dbgfs_set, "0x%llx\n");
- DEFINE_SIMPLE_ATTRIBUTE(eeh_freeze_dbgfs_ops, eeh_freeze_dbgfs_get,
- eeh_freeze_dbgfs_set, "0x%llx\n");
- #endif
- static int __init eeh_init_proc(void)
- {
- if (machine_is(pseries) || machine_is(powernv)) {
- proc_create("powerpc/eeh", 0, NULL, &proc_eeh_operations);
- #ifdef CONFIG_DEBUG_FS
- debugfs_create_file("eeh_enable", 0600,
- powerpc_debugfs_root, NULL,
- &eeh_enable_dbgfs_ops);
- debugfs_create_file("eeh_max_freezes", 0600,
- powerpc_debugfs_root, NULL,
- &eeh_freeze_dbgfs_ops);
- #endif
- }
- return 0;
- }
- __initcall(eeh_init_proc);
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