Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * eeh.c |
Linas Vepstas | 3c8c90a | 2007-05-24 03:28:01 +1000 | [diff] [blame] | 3 | * Copyright IBM Corporation 2001, 2005, 2006 |
| 4 | * Copyright Dave Engebretsen & Todd Inglett 2001 |
| 5 | * Copyright Linas Vepstas 2005, 2006 |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 11 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 16 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
Linas Vepstas | 3c8c90a | 2007-05-24 03:28:01 +1000 | [diff] [blame] | 20 | * |
| 21 | * Please address comments and feedback to Linas Vepstas <linas@austin.ibm.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | */ |
| 23 | |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 24 | #include <linux/delay.h> |
Paul Gortmaker | 62fe91b | 2011-05-27 14:25:11 -0400 | [diff] [blame] | 25 | #include <linux/sched.h> /* for init_mm */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/init.h> |
| 27 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/pci.h> |
| 29 | #include <linux/proc_fs.h> |
| 30 | #include <linux/rbtree.h> |
| 31 | #include <linux/seq_file.h> |
| 32 | #include <linux/spinlock.h> |
Paul Gortmaker | 66b15db | 2011-05-27 10:46:24 -0400 | [diff] [blame] | 33 | #include <linux/export.h> |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 34 | #include <linux/of.h> |
| 35 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 36 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <asm/eeh.h> |
Linas Vepstas | 172ca92 | 2005-11-03 18:50:04 -0600 | [diff] [blame] | 38 | #include <asm/eeh_event.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/io.h> |
| 40 | #include <asm/machdep.h> |
Stephen Rothwell | d387899 | 2005-09-28 02:50:25 +1000 | [diff] [blame] | 41 | #include <asm/ppc-pci.h> |
Linas Vepstas | 172ca92 | 2005-11-03 18:50:04 -0600 | [diff] [blame] | 42 | #include <asm/rtas.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /** Overview: |
| 46 | * EEH, or "Extended Error Handling" is a PCI bridge technology for |
| 47 | * dealing with PCI bus errors that can't be dealt with within the |
| 48 | * usual PCI framework, except by check-stopping the CPU. Systems |
| 49 | * that are designed for high-availability/reliability cannot afford |
| 50 | * to crash due to a "mere" PCI error, thus the need for EEH. |
| 51 | * An EEH-capable bridge operates by converting a detected error |
| 52 | * into a "slot freeze", taking the PCI adapter off-line, making |
| 53 | * the slot behave, from the OS'es point of view, as if the slot |
| 54 | * were "empty": all reads return 0xff's and all writes are silently |
| 55 | * ignored. EEH slot isolation events can be triggered by parity |
| 56 | * errors on the address or data busses (e.g. during posted writes), |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 57 | * which in turn might be caused by low voltage on the bus, dust, |
| 58 | * vibration, humidity, radioactivity or plain-old failed hardware. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | * |
| 60 | * Note, however, that one of the leading causes of EEH slot |
| 61 | * freeze events are buggy device drivers, buggy device microcode, |
| 62 | * or buggy device hardware. This is because any attempt by the |
| 63 | * device to bus-master data to a memory address that is not |
| 64 | * assigned to the device will trigger a slot freeze. (The idea |
| 65 | * is to prevent devices-gone-wild from corrupting system memory). |
| 66 | * Buggy hardware/drivers will have a miserable time co-existing |
| 67 | * with EEH. |
| 68 | * |
| 69 | * Ideally, a PCI device driver, when suspecting that an isolation |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 70 | * event has occurred (e.g. by reading 0xff's), will then ask EEH |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | * whether this is the case, and then take appropriate steps to |
| 72 | * reset the PCI slot, the PCI device, and then resume operations. |
| 73 | * However, until that day, the checking is done here, with the |
| 74 | * eeh_check_failure() routine embedded in the MMIO macros. If |
| 75 | * the slot is found to be isolated, an "EEH Event" is synthesized |
| 76 | * and sent out for processing. |
| 77 | */ |
| 78 | |
Linas Vepstas | 5c1344e | 2005-11-03 18:49:31 -0600 | [diff] [blame] | 79 | /* If a device driver keeps reading an MMIO register in an interrupt |
Mike Mason | f36c522 | 2008-07-22 02:40:17 +1000 | [diff] [blame] | 80 | * handler after a slot isolation event, it might be broken. |
| 81 | * This sets the threshold for how many read attempts we allow |
| 82 | * before printing an error message. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | */ |
Linas Vepstas | 2fd30be | 2007-03-19 14:53:22 -0500 | [diff] [blame] | 84 | #define EEH_MAX_FAILS 2100000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Linas Vepstas | 17213c3 | 2007-05-10 02:38:11 +1000 | [diff] [blame] | 86 | /* Time to wait for a PCI slot to report status, in milliseconds */ |
Linas Vepstas | 9c54776 | 2007-03-19 14:58:07 -0500 | [diff] [blame] | 87 | #define PCI_BUS_RESET_WAIT_MSEC (60*1000) |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | /* RTAS tokens */ |
| 90 | static int ibm_set_eeh_option; |
| 91 | static int ibm_set_slot_reset; |
| 92 | static int ibm_read_slot_reset_state; |
| 93 | static int ibm_read_slot_reset_state2; |
| 94 | static int ibm_slot_error_detail; |
Linas Vepstas | 25e591f | 2005-11-03 18:53:20 -0600 | [diff] [blame] | 95 | static int ibm_get_config_addr_info; |
Linas Vepstas | 147d6a3 | 2007-03-19 14:54:21 -0500 | [diff] [blame] | 96 | static int ibm_get_config_addr_info2; |
Linas Vepstas | 21e464d | 2005-11-03 18:54:47 -0600 | [diff] [blame] | 97 | static int ibm_configure_bridge; |
Richard A. Lary | 65f47f1 | 2011-04-06 12:50:45 +0000 | [diff] [blame] | 98 | static int ibm_configure_pe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
David Woodhouse | 1e28a7d | 2005-11-17 00:44:03 +0000 | [diff] [blame] | 100 | int eeh_subsystem_enabled; |
| 101 | EXPORT_SYMBOL(eeh_subsystem_enabled); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 103 | /* Lock to avoid races due to multiple reports of an error */ |
Thomas Gleixner | 3d37262 | 2010-02-18 02:23:07 +0000 | [diff] [blame] | 104 | static DEFINE_RAW_SPINLOCK(confirm_error_lock); |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 105 | |
Linas Vepstas | 17213c3 | 2007-05-10 02:38:11 +1000 | [diff] [blame] | 106 | /* Buffer for reporting slot-error-detail rtas calls. Its here |
| 107 | * in BSS, and not dynamically alloced, so that it ends up in |
| 108 | * RMO where RTAS can access it. |
| 109 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX]; |
| 111 | static DEFINE_SPINLOCK(slot_errbuf_lock); |
| 112 | static int eeh_error_buf_size; |
| 113 | |
Linas Vepstas | 17213c3 | 2007-05-10 02:38:11 +1000 | [diff] [blame] | 114 | /* Buffer for reporting pci register dumps. Its here in BSS, and |
| 115 | * not dynamically alloced, so that it ends up in RMO where RTAS |
| 116 | * can access it. |
| 117 | */ |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 118 | #define EEH_PCI_REGS_LOG_LEN 4096 |
| 119 | static unsigned char pci_regs_buf[EEH_PCI_REGS_LOG_LEN]; |
| 120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | /* System monitoring statistics */ |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 122 | static unsigned long no_device; |
| 123 | static unsigned long no_dn; |
| 124 | static unsigned long no_cfg_addr; |
| 125 | static unsigned long ignored_check; |
| 126 | static unsigned long total_mmio_ffs; |
| 127 | static unsigned long false_positives; |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 128 | static unsigned long slot_resets; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Linas Vepstas | 7684b40 | 2005-11-03 18:55:19 -0600 | [diff] [blame] | 130 | #define IS_BRIDGE(class_code) (((class_code)<<16) == PCI_BASE_CLASS_BRIDGE) |
| 131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | /* --------------------------------------------------------------- */ |
Linas Vepstas | 5d5a093 | 2005-11-03 18:53:07 -0600 | [diff] [blame] | 133 | /* Below lies the EEH event infrastructure */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 135 | static void rtas_slot_error_detail(struct pci_dn *pdn, int severity, |
| 136 | char *driver_log, size_t loglen) |
Linas Vepstas | df7242b | 2005-11-03 18:49:01 -0600 | [diff] [blame] | 137 | { |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 138 | int config_addr; |
Linas Vepstas | df7242b | 2005-11-03 18:49:01 -0600 | [diff] [blame] | 139 | unsigned long flags; |
| 140 | int rc; |
| 141 | |
| 142 | /* Log the error with the rtas logger */ |
| 143 | spin_lock_irqsave(&slot_errbuf_lock, flags); |
| 144 | memset(slot_errbuf, 0, eeh_error_buf_size); |
| 145 | |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 146 | /* Use PE configuration address, if present */ |
| 147 | config_addr = pdn->eeh_config_addr; |
| 148 | if (pdn->eeh_pe_config_addr) |
| 149 | config_addr = pdn->eeh_pe_config_addr; |
| 150 | |
Linas Vepstas | df7242b | 2005-11-03 18:49:01 -0600 | [diff] [blame] | 151 | rc = rtas_call(ibm_slot_error_detail, |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 152 | 8, 1, NULL, config_addr, |
Linas Vepstas | df7242b | 2005-11-03 18:49:01 -0600 | [diff] [blame] | 153 | BUID_HI(pdn->phb->buid), |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 154 | BUID_LO(pdn->phb->buid), |
| 155 | virt_to_phys(driver_log), loglen, |
Linas Vepstas | df7242b | 2005-11-03 18:49:01 -0600 | [diff] [blame] | 156 | virt_to_phys(slot_errbuf), |
| 157 | eeh_error_buf_size, |
| 158 | severity); |
| 159 | |
| 160 | if (rc == 0) |
| 161 | log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0); |
| 162 | spin_unlock_irqrestore(&slot_errbuf_lock, flags); |
| 163 | } |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | /** |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 166 | * gather_pci_data - copy assorted PCI config space registers to buff |
| 167 | * @pdn: device to report data for |
| 168 | * @buf: point to buffer in which to log |
| 169 | * @len: amount of room in buffer |
| 170 | * |
| 171 | * This routine captures assorted PCI configuration space data, |
| 172 | * and puts them into a buffer for RTAS error logging. |
| 173 | */ |
| 174 | static size_t gather_pci_data(struct pci_dn *pdn, char * buf, size_t len) |
| 175 | { |
Linas Vepstas | 0b9369f | 2007-07-27 08:35:40 +1000 | [diff] [blame] | 176 | struct pci_dev *dev = pdn->pcidev; |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 177 | u32 cfg; |
Linas Vepstas | fcf9892b | 2007-05-09 09:36:21 +1000 | [diff] [blame] | 178 | int cap, i; |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 179 | int n = 0; |
| 180 | |
Linas Vepstas | fcf9892b | 2007-05-09 09:36:21 +1000 | [diff] [blame] | 181 | n += scnprintf(buf+n, len-n, "%s\n", pdn->node->full_name); |
| 182 | printk(KERN_WARNING "EEH: of node=%s\n", pdn->node->full_name); |
| 183 | |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 184 | rtas_read_config(pdn, PCI_VENDOR_ID, 4, &cfg); |
Linas Vepstas | fcf9892b | 2007-05-09 09:36:21 +1000 | [diff] [blame] | 185 | n += scnprintf(buf+n, len-n, "dev/vend:%08x\n", cfg); |
| 186 | printk(KERN_WARNING "EEH: PCI device/vendor: %08x\n", cfg); |
| 187 | |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 188 | rtas_read_config(pdn, PCI_COMMAND, 4, &cfg); |
| 189 | n += scnprintf(buf+n, len-n, "cmd/stat:%x\n", cfg); |
Linas Vepstas | fcf9892b | 2007-05-09 09:36:21 +1000 | [diff] [blame] | 190 | printk(KERN_WARNING "EEH: PCI cmd/status register: %08x\n", cfg); |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 191 | |
Linas Vepstas | b37ceef | 2007-11-03 07:29:01 +1100 | [diff] [blame] | 192 | if (!dev) { |
| 193 | printk(KERN_WARNING "EEH: no PCI device for this of node\n"); |
| 194 | return n; |
| 195 | } |
| 196 | |
Linas Vepstas | 0b9369f | 2007-07-27 08:35:40 +1000 | [diff] [blame] | 197 | /* Gather bridge-specific registers */ |
| 198 | if (dev->class >> 16 == PCI_BASE_CLASS_BRIDGE) { |
| 199 | rtas_read_config(pdn, PCI_SEC_STATUS, 2, &cfg); |
| 200 | n += scnprintf(buf+n, len-n, "sec stat:%x\n", cfg); |
| 201 | printk(KERN_WARNING "EEH: Bridge secondary status: %04x\n", cfg); |
| 202 | |
| 203 | rtas_read_config(pdn, PCI_BRIDGE_CONTROL, 2, &cfg); |
| 204 | n += scnprintf(buf+n, len-n, "brdg ctl:%x\n", cfg); |
| 205 | printk(KERN_WARNING "EEH: Bridge control: %04x\n", cfg); |
| 206 | } |
| 207 | |
Linas Vepstas | fcf9892b | 2007-05-09 09:36:21 +1000 | [diff] [blame] | 208 | /* Dump out the PCI-X command and status regs */ |
Linas Vepstas | b37ceef | 2007-11-03 07:29:01 +1100 | [diff] [blame] | 209 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
Linas Vepstas | fcf9892b | 2007-05-09 09:36:21 +1000 | [diff] [blame] | 210 | if (cap) { |
| 211 | rtas_read_config(pdn, cap, 4, &cfg); |
| 212 | n += scnprintf(buf+n, len-n, "pcix-cmd:%x\n", cfg); |
| 213 | printk(KERN_WARNING "EEH: PCI-X cmd: %08x\n", cfg); |
| 214 | |
| 215 | rtas_read_config(pdn, cap+4, 4, &cfg); |
| 216 | n += scnprintf(buf+n, len-n, "pcix-stat:%x\n", cfg); |
| 217 | printk(KERN_WARNING "EEH: PCI-X status: %08x\n", cfg); |
| 218 | } |
| 219 | |
| 220 | /* If PCI-E capable, dump PCI-E cap 10, and the AER */ |
Linas Vepstas | b37ceef | 2007-11-03 07:29:01 +1100 | [diff] [blame] | 221 | cap = pci_find_capability(dev, PCI_CAP_ID_EXP); |
Linas Vepstas | fcf9892b | 2007-05-09 09:36:21 +1000 | [diff] [blame] | 222 | if (cap) { |
| 223 | n += scnprintf(buf+n, len-n, "pci-e cap10:\n"); |
| 224 | printk(KERN_WARNING |
| 225 | "EEH: PCI-E capabilities and status follow:\n"); |
| 226 | |
| 227 | for (i=0; i<=8; i++) { |
| 228 | rtas_read_config(pdn, cap+4*i, 4, &cfg); |
| 229 | n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg); |
| 230 | printk(KERN_WARNING "EEH: PCI-E %02x: %08x\n", i, cfg); |
| 231 | } |
| 232 | |
Linas Vepstas | b37ceef | 2007-11-03 07:29:01 +1100 | [diff] [blame] | 233 | cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
Linas Vepstas | fcf9892b | 2007-05-09 09:36:21 +1000 | [diff] [blame] | 234 | if (cap) { |
| 235 | n += scnprintf(buf+n, len-n, "pci-e AER:\n"); |
| 236 | printk(KERN_WARNING |
| 237 | "EEH: PCI-E AER capability register set follows:\n"); |
| 238 | |
| 239 | for (i=0; i<14; i++) { |
| 240 | rtas_read_config(pdn, cap+4*i, 4, &cfg); |
| 241 | n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg); |
| 242 | printk(KERN_WARNING "EEH: PCI-E AER %02x: %08x\n", i, cfg); |
| 243 | } |
| 244 | } |
| 245 | } |
Linas Vepstas | 0b9369f | 2007-07-27 08:35:40 +1000 | [diff] [blame] | 246 | |
| 247 | /* Gather status on devices under the bridge */ |
| 248 | if (dev->class >> 16 == PCI_BASE_CLASS_BRIDGE) { |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 249 | struct device_node *dn; |
| 250 | |
| 251 | for_each_child_of_node(pdn->node, dn) { |
Linas Vepstas | 0b9369f | 2007-07-27 08:35:40 +1000 | [diff] [blame] | 252 | pdn = PCI_DN(dn); |
| 253 | if (pdn) |
| 254 | n += gather_pci_data(pdn, buf+n, len-n); |
Linas Vepstas | 0b9369f | 2007-07-27 08:35:40 +1000 | [diff] [blame] | 255 | } |
| 256 | } |
| 257 | |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 258 | return n; |
| 259 | } |
| 260 | |
| 261 | void eeh_slot_error_detail(struct pci_dn *pdn, int severity) |
| 262 | { |
| 263 | size_t loglen = 0; |
Linas Vepstas | 17213c3 | 2007-05-10 02:38:11 +1000 | [diff] [blame] | 264 | pci_regs_buf[0] = 0; |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 265 | |
| 266 | rtas_pci_enable(pdn, EEH_THAW_MMIO); |
Richard A. Lary | 65f47f1 | 2011-04-06 12:50:45 +0000 | [diff] [blame] | 267 | rtas_configure_bridge(pdn); |
| 268 | eeh_restore_bars(pdn); |
Linas Vepstas | d99bb1d | 2007-05-09 09:35:32 +1000 | [diff] [blame] | 269 | loglen = gather_pci_data(pdn, pci_regs_buf, EEH_PCI_REGS_LOG_LEN); |
| 270 | |
| 271 | rtas_slot_error_detail(pdn, severity, pci_regs_buf, loglen); |
| 272 | } |
| 273 | |
| 274 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | * read_slot_reset_state - Read the reset state of a device node's slot |
| 276 | * @dn: device node to read |
| 277 | * @rets: array to return results in |
| 278 | */ |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 279 | static int read_slot_reset_state(struct pci_dn *pdn, int rets[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
| 281 | int token, outputs; |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 282 | int config_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
| 284 | if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) { |
| 285 | token = ibm_read_slot_reset_state2; |
| 286 | outputs = 4; |
| 287 | } else { |
| 288 | token = ibm_read_slot_reset_state; |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 289 | rets[2] = 0; /* fake PE Unavailable info */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | outputs = 3; |
| 291 | } |
| 292 | |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 293 | /* Use PE configuration address, if present */ |
| 294 | config_addr = pdn->eeh_config_addr; |
| 295 | if (pdn->eeh_pe_config_addr) |
| 296 | config_addr = pdn->eeh_pe_config_addr; |
| 297 | |
| 298 | return rtas_call(token, 3, outputs, rets, config_addr, |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 299 | BUID_HI(pdn->phb->buid), BUID_LO(pdn->phb->buid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | /** |
Linas Vepstas | 9c54776 | 2007-03-19 14:58:07 -0500 | [diff] [blame] | 303 | * eeh_wait_for_slot_status - returns error status of slot |
| 304 | * @pdn pci device node |
| 305 | * @max_wait_msecs maximum number to millisecs to wait |
| 306 | * |
| 307 | * Return negative value if a permanent error, else return |
| 308 | * Partition Endpoint (PE) status value. |
| 309 | * |
| 310 | * If @max_wait_msecs is positive, then this routine will |
| 311 | * sleep until a valid status can be obtained, or until |
| 312 | * the max allowed wait time is exceeded, in which case |
| 313 | * a -2 is returned. |
| 314 | */ |
| 315 | int |
| 316 | eeh_wait_for_slot_status(struct pci_dn *pdn, int max_wait_msecs) |
| 317 | { |
| 318 | int rc; |
| 319 | int rets[3]; |
| 320 | int mwait; |
| 321 | |
| 322 | while (1) { |
| 323 | rc = read_slot_reset_state(pdn, rets); |
| 324 | if (rc) return rc; |
| 325 | if (rets[1] == 0) return -1; /* EEH is not supported */ |
| 326 | |
| 327 | if (rets[0] != 5) return rets[0]; /* return actual status */ |
| 328 | |
| 329 | if (rets[2] == 0) return -1; /* permanently unavailable */ |
| 330 | |
Linas Vepstas | 2c84b40 | 2007-11-08 07:03:53 +1100 | [diff] [blame] | 331 | if (max_wait_msecs <= 0) break; |
Linas Vepstas | 9c54776 | 2007-03-19 14:58:07 -0500 | [diff] [blame] | 332 | |
| 333 | mwait = rets[2]; |
| 334 | if (mwait <= 0) { |
| 335 | printk (KERN_WARNING |
| 336 | "EEH: Firmware returned bad wait value=%d\n", mwait); |
| 337 | mwait = 1000; |
| 338 | } else if (mwait > 300*1000) { |
| 339 | printk (KERN_WARNING |
| 340 | "EEH: Firmware is taking too long, time=%d\n", mwait); |
| 341 | mwait = 300*1000; |
| 342 | } |
| 343 | max_wait_msecs -= mwait; |
| 344 | msleep (mwait); |
| 345 | } |
| 346 | |
| 347 | printk(KERN_WARNING "EEH: Timed out waiting for slot status\n"); |
| 348 | return -2; |
| 349 | } |
| 350 | |
| 351 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | * eeh_token_to_phys - convert EEH address token to phys address |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 353 | * @token i/o token, should be address in the form 0xA.... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | */ |
| 355 | static inline unsigned long eeh_token_to_phys(unsigned long token) |
| 356 | { |
| 357 | pte_t *ptep; |
| 358 | unsigned long pa; |
| 359 | |
David Gibson | 20cee16 | 2005-06-21 17:15:31 -0700 | [diff] [blame] | 360 | ptep = find_linux_pte(init_mm.pgd, token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | if (!ptep) |
| 362 | return token; |
| 363 | pa = pte_pfn(*ptep) << PAGE_SHIFT; |
| 364 | |
| 365 | return pa | (token & (PAGE_SIZE-1)); |
| 366 | } |
| 367 | |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 368 | /** |
| 369 | * Return the "partitionable endpoint" (pe) under which this device lies |
| 370 | */ |
Linas Vepstas | 9fb40eb | 2005-11-03 18:54:29 -0600 | [diff] [blame] | 371 | struct device_node * find_device_pe(struct device_node *dn) |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 372 | { |
| 373 | while ((dn->parent) && PCI_DN(dn->parent) && |
| 374 | (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) { |
| 375 | dn = dn->parent; |
| 376 | } |
| 377 | return dn; |
| 378 | } |
| 379 | |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 380 | /** Mark all devices that are children of this device as failed. |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 381 | * Mark the device driver too, so that it can see the failure |
| 382 | * immediately; this is critical, since some drivers poll |
| 383 | * status registers in interrupts ... If a driver is polling, |
| 384 | * and the slot is frozen, then the driver can deadlock in |
| 385 | * an interrupt context, which is bad. |
| 386 | */ |
| 387 | |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 388 | static void __eeh_mark_slot(struct device_node *parent, int mode_flag) |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 389 | { |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 390 | struct device_node *dn; |
| 391 | |
| 392 | for_each_child_of_node(parent, dn) { |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 393 | if (PCI_DN(dn)) { |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 394 | /* Mark the pci device driver too */ |
| 395 | struct pci_dev *dev = PCI_DN(dn)->pcidev; |
Olof Johansson | ea183a9 | 2006-01-11 14:02:58 -0600 | [diff] [blame] | 396 | |
| 397 | PCI_DN(dn)->eeh_mode |= mode_flag; |
| 398 | |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 399 | if (dev && dev->driver) |
| 400 | dev->error_state = pci_channel_io_frozen; |
| 401 | |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 402 | __eeh_mark_slot(dn, mode_flag); |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 403 | } |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 404 | } |
| 405 | } |
| 406 | |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 407 | void eeh_mark_slot (struct device_node *dn, int mode_flag) |
| 408 | { |
Linas Vepstas | 022d51b | 2006-09-25 18:01:42 -0500 | [diff] [blame] | 409 | struct pci_dev *dev; |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 410 | dn = find_device_pe (dn); |
Linas Vepstas | 3914ac7 | 2005-11-03 18:55:01 -0600 | [diff] [blame] | 411 | |
| 412 | /* Back up one, since config addrs might be shared */ |
Linas Vepstas | 4980d5e | 2007-03-19 15:01:31 -0500 | [diff] [blame] | 413 | if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent)) |
Linas Vepstas | 3914ac7 | 2005-11-03 18:55:01 -0600 | [diff] [blame] | 414 | dn = dn->parent; |
| 415 | |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 416 | PCI_DN(dn)->eeh_mode |= mode_flag; |
Linas Vepstas | 022d51b | 2006-09-25 18:01:42 -0500 | [diff] [blame] | 417 | |
| 418 | /* Mark the pci device too */ |
| 419 | dev = PCI_DN(dn)->pcidev; |
| 420 | if (dev) |
| 421 | dev->error_state = pci_channel_io_frozen; |
| 422 | |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 423 | __eeh_mark_slot(dn, mode_flag); |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 424 | } |
| 425 | |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 426 | static void __eeh_clear_slot(struct device_node *parent, int mode_flag) |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 427 | { |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 428 | struct device_node *dn; |
| 429 | |
| 430 | for_each_child_of_node(parent, dn) { |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 431 | if (PCI_DN(dn)) { |
| 432 | PCI_DN(dn)->eeh_mode &= ~mode_flag; |
| 433 | PCI_DN(dn)->eeh_check_count = 0; |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 434 | __eeh_clear_slot(dn, mode_flag); |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 435 | } |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 436 | } |
| 437 | } |
| 438 | |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 439 | void eeh_clear_slot (struct device_node *dn, int mode_flag) |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 440 | { |
| 441 | unsigned long flags; |
Thomas Gleixner | 3d37262 | 2010-02-18 02:23:07 +0000 | [diff] [blame] | 442 | raw_spin_lock_irqsave(&confirm_error_lock, flags); |
Linas Vepstas | 3914ac7 | 2005-11-03 18:55:01 -0600 | [diff] [blame] | 443 | |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 444 | dn = find_device_pe (dn); |
Linas Vepstas | 3914ac7 | 2005-11-03 18:55:01 -0600 | [diff] [blame] | 445 | |
| 446 | /* Back up one, since config addrs might be shared */ |
Linas Vepstas | 4980d5e | 2007-03-19 15:01:31 -0500 | [diff] [blame] | 447 | if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent)) |
Linas Vepstas | 3914ac7 | 2005-11-03 18:55:01 -0600 | [diff] [blame] | 448 | dn = dn->parent; |
| 449 | |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 450 | PCI_DN(dn)->eeh_mode &= ~mode_flag; |
| 451 | PCI_DN(dn)->eeh_check_count = 0; |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 452 | __eeh_clear_slot(dn, mode_flag); |
Thomas Gleixner | 3d37262 | 2010-02-18 02:23:07 +0000 | [diff] [blame] | 453 | raw_spin_unlock_irqrestore(&confirm_error_lock, flags); |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 454 | } |
| 455 | |
Richard A Lary | 308fc4f | 2011-04-22 09:59:47 +0000 | [diff] [blame] | 456 | void __eeh_set_pe_freset(struct device_node *parent, unsigned int *freset) |
| 457 | { |
| 458 | struct device_node *dn; |
| 459 | |
| 460 | for_each_child_of_node(parent, dn) { |
| 461 | if (PCI_DN(dn)) { |
| 462 | |
| 463 | struct pci_dev *dev = PCI_DN(dn)->pcidev; |
| 464 | |
| 465 | if (dev && dev->driver) |
| 466 | *freset |= dev->needs_freset; |
| 467 | |
| 468 | __eeh_set_pe_freset(dn, freset); |
| 469 | } |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | void eeh_set_pe_freset(struct device_node *dn, unsigned int *freset) |
| 474 | { |
| 475 | struct pci_dev *dev; |
| 476 | dn = find_device_pe(dn); |
| 477 | |
| 478 | /* Back up one, since config addrs might be shared */ |
| 479 | if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent)) |
| 480 | dn = dn->parent; |
| 481 | |
| 482 | dev = PCI_DN(dn)->pcidev; |
| 483 | if (dev) |
| 484 | *freset |= dev->needs_freset; |
| 485 | |
| 486 | __eeh_set_pe_freset(dn, freset); |
| 487 | } |
| 488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | /** |
| 490 | * eeh_dn_check_failure - check if all 1's data is due to EEH slot freeze |
| 491 | * @dn device node |
| 492 | * @dev pci device, if known |
| 493 | * |
| 494 | * Check for an EEH failure for the given device node. Call this |
| 495 | * routine if the result of a read was all 0xff's and you want to |
| 496 | * find out if this is due to an EEH slot freeze. This routine |
| 497 | * will query firmware for the EEH status. |
| 498 | * |
| 499 | * Returns 0 if there has not been an EEH error; otherwise returns |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 500 | * a non-zero value and queues up a slot isolation event notification. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | * |
| 502 | * It is safe to call this routine in an interrupt context. |
| 503 | */ |
| 504 | int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) |
| 505 | { |
| 506 | int ret; |
| 507 | int rets[3]; |
| 508 | unsigned long flags; |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 509 | struct pci_dn *pdn; |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 510 | int rc = 0; |
Mike Mason | f36c522 | 2008-07-22 02:40:17 +1000 | [diff] [blame] | 511 | const char *location; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 513 | total_mmio_ffs++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
| 515 | if (!eeh_subsystem_enabled) |
| 516 | return 0; |
| 517 | |
Linas Vepstas | 177bc93 | 2005-11-03 18:48:52 -0600 | [diff] [blame] | 518 | if (!dn) { |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 519 | no_dn++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | return 0; |
Linas Vepstas | 177bc93 | 2005-11-03 18:48:52 -0600 | [diff] [blame] | 521 | } |
Linas Vepstas | 307d46e | 2007-11-16 05:56:23 +1100 | [diff] [blame] | 522 | dn = find_device_pe(dn); |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 523 | pdn = PCI_DN(dn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
| 525 | /* Access to IO BARs might get this far and still not want checking. */ |
Linas Vepstas | f8632c8 | 2005-11-03 18:49:45 -0600 | [diff] [blame] | 526 | if (!(pdn->eeh_mode & EEH_MODE_SUPPORTED) || |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 527 | pdn->eeh_mode & EEH_MODE_NOCHECK) { |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 528 | ignored_check++; |
Benjamin Herrenschmidt | 57b066f | 2008-10-27 19:48:41 +0000 | [diff] [blame] | 529 | pr_debug("EEH: Ignored check (%x) for %s %s\n", |
Breno Leitao | 8d3d50b | 2010-02-03 05:56:41 +0000 | [diff] [blame] | 530 | pdn->eeh_mode, eeh_pci_name(dev), dn->full_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | return 0; |
| 532 | } |
| 533 | |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 534 | if (!pdn->eeh_config_addr && !pdn->eeh_pe_config_addr) { |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 535 | no_cfg_addr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | return 0; |
| 537 | } |
| 538 | |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 539 | /* If we already have a pending isolation event for this |
| 540 | * slot, we know it's bad already, we don't need to check. |
| 541 | * Do this checking under a lock; as multiple PCI devices |
| 542 | * in one slot might report errors simultaneously, and we |
| 543 | * only want one error recovery routine running. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | */ |
Thomas Gleixner | 3d37262 | 2010-02-18 02:23:07 +0000 | [diff] [blame] | 545 | raw_spin_lock_irqsave(&confirm_error_lock, flags); |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 546 | rc = 1; |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 547 | if (pdn->eeh_mode & EEH_MODE_ISOLATED) { |
Linas Vepstas | 5c1344e | 2005-11-03 18:49:31 -0600 | [diff] [blame] | 548 | pdn->eeh_check_count ++; |
Mike Mason | f36c522 | 2008-07-22 02:40:17 +1000 | [diff] [blame] | 549 | if (pdn->eeh_check_count % EEH_MAX_FAILS == 0) { |
| 550 | location = of_get_property(dn, "ibm,loc-code", NULL); |
| 551 | printk (KERN_ERR "EEH: %d reads ignored for recovering device at " |
| 552 | "location=%s driver=%s pci addr=%s\n", |
| 553 | pdn->eeh_check_count, location, |
Breno Leitao | 8d3d50b | 2010-02-03 05:56:41 +0000 | [diff] [blame] | 554 | dev->driver->name, eeh_pci_name(dev)); |
Mike Mason | f36c522 | 2008-07-22 02:40:17 +1000 | [diff] [blame] | 555 | printk (KERN_ERR "EEH: Might be infinite loop in %s driver\n", |
| 556 | dev->driver->name); |
Linas Vepstas | 5c1344e | 2005-11-03 18:49:31 -0600 | [diff] [blame] | 557 | dump_stack(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 559 | goto dn_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | /* |
| 563 | * Now test for an EEH failure. This is VERY expensive. |
| 564 | * Note that the eeh_config_addr may be a parent device |
| 565 | * in the case of a device behind a bridge, or it may be |
| 566 | * function zero of a multi-function device. |
| 567 | * In any case they must share a common PHB. |
| 568 | */ |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 569 | ret = read_slot_reset_state(pdn, rets); |
Linas Vepstas | 76e6faf | 2005-11-03 18:49:15 -0600 | [diff] [blame] | 570 | |
| 571 | /* If the call to firmware failed, punt */ |
| 572 | if (ret != 0) { |
| 573 | printk(KERN_WARNING "EEH: read_slot_reset_state() failed; rc=%d dn=%s\n", |
| 574 | ret, dn->full_name); |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 575 | false_positives++; |
Linas Vepstas | 858955b | 2007-05-24 03:20:51 +1000 | [diff] [blame] | 576 | pdn->eeh_false_positives ++; |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 577 | rc = 0; |
| 578 | goto dn_unlock; |
Linas Vepstas | 76e6faf | 2005-11-03 18:49:15 -0600 | [diff] [blame] | 579 | } |
| 580 | |
Linas Vepstas | 39d16e2 | 2007-03-19 14:51:00 -0500 | [diff] [blame] | 581 | /* Note that config-io to empty slots may fail; |
| 582 | * they are empty when they don't have children. */ |
Linas Vepstas | c9b65a7 | 2007-11-16 05:57:27 +1100 | [diff] [blame] | 583 | if ((rets[0] == 5) && (rets[2] == 0) && (dn->child == NULL)) { |
Linas Vepstas | 39d16e2 | 2007-03-19 14:51:00 -0500 | [diff] [blame] | 584 | false_positives++; |
Linas Vepstas | 858955b | 2007-05-24 03:20:51 +1000 | [diff] [blame] | 585 | pdn->eeh_false_positives ++; |
Linas Vepstas | 39d16e2 | 2007-03-19 14:51:00 -0500 | [diff] [blame] | 586 | rc = 0; |
| 587 | goto dn_unlock; |
| 588 | } |
| 589 | |
Linas Vepstas | 76e6faf | 2005-11-03 18:49:15 -0600 | [diff] [blame] | 590 | /* If EEH is not supported on this device, punt. */ |
| 591 | if (rets[1] != 1) { |
| 592 | printk(KERN_WARNING "EEH: event on unsupported device, rc=%d dn=%s\n", |
| 593 | ret, dn->full_name); |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 594 | false_positives++; |
Linas Vepstas | 858955b | 2007-05-24 03:20:51 +1000 | [diff] [blame] | 595 | pdn->eeh_false_positives ++; |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 596 | rc = 0; |
| 597 | goto dn_unlock; |
Linas Vepstas | 76e6faf | 2005-11-03 18:49:15 -0600 | [diff] [blame] | 598 | } |
| 599 | |
| 600 | /* If not the kind of error we know about, punt. */ |
Linas Vepstas | 90375f5 | 2007-03-19 14:56:43 -0500 | [diff] [blame] | 601 | if (rets[0] != 1 && rets[0] != 2 && rets[0] != 4 && rets[0] != 5) { |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 602 | false_positives++; |
Linas Vepstas | 858955b | 2007-05-24 03:20:51 +1000 | [diff] [blame] | 603 | pdn->eeh_false_positives ++; |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 604 | rc = 0; |
| 605 | goto dn_unlock; |
Linas Vepstas | 76e6faf | 2005-11-03 18:49:15 -0600 | [diff] [blame] | 606 | } |
| 607 | |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 608 | slot_resets++; |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 609 | |
| 610 | /* Avoid repeated reports of this failure, including problems |
| 611 | * with other functions on this device, and functions under |
| 612 | * bridges. */ |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 613 | eeh_mark_slot (dn, EEH_MODE_ISOLATED); |
Thomas Gleixner | 3d37262 | 2010-02-18 02:23:07 +0000 | [diff] [blame] | 614 | raw_spin_unlock_irqrestore(&confirm_error_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
Linas Vepstas | d0ab95c | 2007-03-19 14:59:10 -0500 | [diff] [blame] | 616 | eeh_send_failure_event (dn, dev); |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | /* Most EEH events are due to device driver bugs. Having |
| 619 | * a stack trace will help the device-driver authors figure |
| 620 | * out what happened. So print that out. */ |
Linas Vepstas | 90375f5 | 2007-03-19 14:56:43 -0500 | [diff] [blame] | 621 | dump_stack(); |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 622 | return 1; |
| 623 | |
| 624 | dn_unlock: |
Thomas Gleixner | 3d37262 | 2010-02-18 02:23:07 +0000 | [diff] [blame] | 625 | raw_spin_unlock_irqrestore(&confirm_error_lock, flags); |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 626 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
| 628 | |
Linas Vepstas | fd761fd | 2005-11-03 18:49:23 -0600 | [diff] [blame] | 629 | EXPORT_SYMBOL_GPL(eeh_dn_check_failure); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
| 631 | /** |
| 632 | * eeh_check_failure - check if all 1's data is due to EEH slot freeze |
| 633 | * @token i/o token, should be address in the form 0xA.... |
| 634 | * @val value, should be all 1's (XXX why do we need this arg??) |
| 635 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | * Check for an EEH failure at the given token address. Call this |
| 637 | * routine if the result of a read was all 0xff's and you want to |
| 638 | * find out if this is due to an EEH slot freeze event. This routine |
| 639 | * will query firmware for the EEH status. |
| 640 | * |
| 641 | * Note this routine is safe to call in an interrupt context. |
| 642 | */ |
| 643 | unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val) |
| 644 | { |
| 645 | unsigned long addr; |
| 646 | struct pci_dev *dev; |
| 647 | struct device_node *dn; |
| 648 | |
| 649 | /* Finding the phys addr + pci device; this is pretty quick. */ |
| 650 | addr = eeh_token_to_phys((unsigned long __force) token); |
| 651 | dev = pci_get_device_by_addr(addr); |
Linas Vepstas | 177bc93 | 2005-11-03 18:48:52 -0600 | [diff] [blame] | 652 | if (!dev) { |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 653 | no_device++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | return val; |
Linas Vepstas | 177bc93 | 2005-11-03 18:48:52 -0600 | [diff] [blame] | 655 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | dn = pci_device_to_OF_node(dev); |
| 658 | eeh_dn_check_failure (dn, dev); |
| 659 | |
| 660 | pci_dev_put(dev); |
| 661 | return val; |
| 662 | } |
| 663 | |
| 664 | EXPORT_SYMBOL(eeh_check_failure); |
| 665 | |
Linas Vepstas | 172ca92 | 2005-11-03 18:50:04 -0600 | [diff] [blame] | 666 | /* ------------------------------------------------------------- */ |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 667 | /* The code below deals with error recovery */ |
| 668 | |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 669 | /** |
Linas Vepstas | 47b5c83 | 2006-09-15 18:57:42 -0500 | [diff] [blame] | 670 | * rtas_pci_enable - enable MMIO or DMA transfers for this slot |
| 671 | * @pdn pci device node |
| 672 | */ |
| 673 | |
| 674 | int |
| 675 | rtas_pci_enable(struct pci_dn *pdn, int function) |
| 676 | { |
| 677 | int config_addr; |
| 678 | int rc; |
| 679 | |
| 680 | /* Use PE configuration address, if present */ |
| 681 | config_addr = pdn->eeh_config_addr; |
| 682 | if (pdn->eeh_pe_config_addr) |
| 683 | config_addr = pdn->eeh_pe_config_addr; |
| 684 | |
| 685 | rc = rtas_call(ibm_set_eeh_option, 4, 1, NULL, |
| 686 | config_addr, |
| 687 | BUID_HI(pdn->phb->buid), |
| 688 | BUID_LO(pdn->phb->buid), |
| 689 | function); |
| 690 | |
| 691 | if (rc) |
Linas Vepstas | fa1be47 | 2007-03-19 14:59:59 -0500 | [diff] [blame] | 692 | printk(KERN_WARNING "EEH: Unexpected state change %d, err=%d dn=%s\n", |
Linas Vepstas | 47b5c83 | 2006-09-15 18:57:42 -0500 | [diff] [blame] | 693 | function, rc, pdn->node->full_name); |
| 694 | |
Linas Vepstas | fa1be47 | 2007-03-19 14:59:59 -0500 | [diff] [blame] | 695 | rc = eeh_wait_for_slot_status (pdn, PCI_BUS_RESET_WAIT_MSEC); |
| 696 | if ((rc == 4) && (function == EEH_THAW_MMIO)) |
| 697 | return 0; |
| 698 | |
Linas Vepstas | 47b5c83 | 2006-09-15 18:57:42 -0500 | [diff] [blame] | 699 | return rc; |
| 700 | } |
| 701 | |
| 702 | /** |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 703 | * rtas_pci_slot_reset - raises/lowers the pci #RST line |
| 704 | * @pdn pci device node |
| 705 | * @state: 1/0 to raise/lower the #RST |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 706 | * |
| 707 | * Clear the EEH-frozen condition on a slot. This routine |
| 708 | * asserts the PCI #RST line if the 'state' argument is '1', |
| 709 | * and drops the #RST line if 'state is '0'. This routine is |
| 710 | * safe to call in an interrupt context. |
| 711 | * |
| 712 | */ |
| 713 | |
| 714 | static void |
| 715 | rtas_pci_slot_reset(struct pci_dn *pdn, int state) |
| 716 | { |
Linas Vepstas | 25e591f | 2005-11-03 18:53:20 -0600 | [diff] [blame] | 717 | int config_addr; |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 718 | int rc; |
| 719 | |
| 720 | BUG_ON (pdn==NULL); |
| 721 | |
| 722 | if (!pdn->phb) { |
| 723 | printk (KERN_WARNING "EEH: in slot reset, device node %s has no phb\n", |
| 724 | pdn->node->full_name); |
| 725 | return; |
| 726 | } |
| 727 | |
Linas Vepstas | 25e591f | 2005-11-03 18:53:20 -0600 | [diff] [blame] | 728 | /* Use PE configuration address, if present */ |
| 729 | config_addr = pdn->eeh_config_addr; |
| 730 | if (pdn->eeh_pe_config_addr) |
| 731 | config_addr = pdn->eeh_pe_config_addr; |
| 732 | |
Richard A Lary | ecb7390 | 2011-04-22 10:00:05 +0000 | [diff] [blame] | 733 | rc = rtas_call(ibm_set_slot_reset, 4, 1, NULL, |
Linas Vepstas | 25e591f | 2005-11-03 18:53:20 -0600 | [diff] [blame] | 734 | config_addr, |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 735 | BUID_HI(pdn->phb->buid), |
| 736 | BUID_LO(pdn->phb->buid), |
| 737 | state); |
Richard A Lary | ecb7390 | 2011-04-22 10:00:05 +0000 | [diff] [blame] | 738 | |
| 739 | /* Fundamental-reset not supported on this PE, try hot-reset */ |
| 740 | if (rc == -8 && state == 3) { |
| 741 | rc = rtas_call(ibm_set_slot_reset, 4, 1, NULL, |
| 742 | config_addr, |
| 743 | BUID_HI(pdn->phb->buid), |
| 744 | BUID_LO(pdn->phb->buid), 1); |
| 745 | if (rc) |
| 746 | printk(KERN_WARNING |
| 747 | "EEH: Unable to reset the failed slot," |
| 748 | " #RST=%d dn=%s\n", |
| 749 | rc, pdn->node->full_name); |
| 750 | } |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 751 | } |
| 752 | |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 753 | /** |
Brian King | 00c2ae3 | 2007-05-08 08:04:05 +1000 | [diff] [blame] | 754 | * pcibios_set_pcie_slot_reset - Set PCI-E reset state |
| 755 | * @dev: pci device struct |
| 756 | * @state: reset state to enter |
| 757 | * |
| 758 | * Return value: |
| 759 | * 0 if success |
| 760 | **/ |
| 761 | int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) |
| 762 | { |
| 763 | struct device_node *dn = pci_device_to_OF_node(dev); |
| 764 | struct pci_dn *pdn = PCI_DN(dn); |
| 765 | |
| 766 | switch (state) { |
| 767 | case pcie_deassert_reset: |
| 768 | rtas_pci_slot_reset(pdn, 0); |
| 769 | break; |
| 770 | case pcie_hot_reset: |
| 771 | rtas_pci_slot_reset(pdn, 1); |
| 772 | break; |
| 773 | case pcie_warm_reset: |
| 774 | rtas_pci_slot_reset(pdn, 3); |
| 775 | break; |
| 776 | default: |
| 777 | return -EINVAL; |
| 778 | }; |
| 779 | |
| 780 | return 0; |
| 781 | } |
| 782 | |
| 783 | /** |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 784 | * rtas_set_slot_reset -- assert the pci #RST line for 1/4 second |
| 785 | * @pdn: pci device node to be reset. |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 786 | */ |
| 787 | |
Linas Vepstas | e102926 | 2006-09-21 18:25:56 -0500 | [diff] [blame] | 788 | static void __rtas_set_slot_reset(struct pci_dn *pdn) |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 789 | { |
Richard A Lary | 308fc4f | 2011-04-22 09:59:47 +0000 | [diff] [blame] | 790 | unsigned int freset = 0; |
Mike Mason | 6e19314 | 2009-07-30 15:42:39 -0700 | [diff] [blame] | 791 | |
Richard A Lary | 308fc4f | 2011-04-22 09:59:47 +0000 | [diff] [blame] | 792 | /* Determine type of EEH reset required for |
| 793 | * Partitionable Endpoint, a hot-reset (1) |
| 794 | * or a fundamental reset (3). |
| 795 | * A fundamental reset required by any device under |
| 796 | * Partitionable Endpoint trumps hot-reset. |
| 797 | */ |
| 798 | eeh_set_pe_freset(pdn->node, &freset); |
| 799 | |
| 800 | if (freset) |
Mike Mason | 6e19314 | 2009-07-30 15:42:39 -0700 | [diff] [blame] | 801 | rtas_pci_slot_reset(pdn, 3); |
| 802 | else |
| 803 | rtas_pci_slot_reset(pdn, 1); |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 804 | |
| 805 | /* The PCI bus requires that the reset be held high for at least |
| 806 | * a 100 milliseconds. We wait a bit longer 'just in case'. */ |
| 807 | |
| 808 | #define PCI_BUS_RST_HOLD_TIME_MSEC 250 |
| 809 | msleep (PCI_BUS_RST_HOLD_TIME_MSEC); |
Linas Vepstas | d9564ad | 2005-11-03 18:50:48 -0600 | [diff] [blame] | 810 | |
| 811 | /* We might get hit with another EEH freeze as soon as the |
| 812 | * pci slot reset line is dropped. Make sure we don't miss |
| 813 | * these, and clear the flag now. */ |
| 814 | eeh_clear_slot (pdn->node, EEH_MODE_ISOLATED); |
| 815 | |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 816 | rtas_pci_slot_reset (pdn, 0); |
| 817 | |
| 818 | /* After a PCI slot has been reset, the PCI Express spec requires |
| 819 | * a 1.5 second idle time for the bus to stabilize, before starting |
| 820 | * up traffic. */ |
| 821 | #define PCI_BUS_SETTLE_TIME_MSEC 1800 |
| 822 | msleep (PCI_BUS_SETTLE_TIME_MSEC); |
Linas Vepstas | e102926 | 2006-09-21 18:25:56 -0500 | [diff] [blame] | 823 | } |
| 824 | |
| 825 | int rtas_set_slot_reset(struct pci_dn *pdn) |
| 826 | { |
| 827 | int i, rc; |
| 828 | |
Linas Vepstas | 9c54776 | 2007-03-19 14:58:07 -0500 | [diff] [blame] | 829 | /* Take three shots at resetting the bus */ |
| 830 | for (i=0; i<3; i++) { |
| 831 | __rtas_set_slot_reset(pdn); |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 832 | |
Linas Vepstas | 9c54776 | 2007-03-19 14:58:07 -0500 | [diff] [blame] | 833 | rc = eeh_wait_for_slot_status(pdn, PCI_BUS_RESET_WAIT_MSEC); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 834 | if (rc == 0) |
| 835 | return 0; |
Linas Vepstas | e102926 | 2006-09-21 18:25:56 -0500 | [diff] [blame] | 836 | |
Linas Vepstas | e102926 | 2006-09-21 18:25:56 -0500 | [diff] [blame] | 837 | if (rc < 0) { |
Linas Vepstas | 12588da | 2007-07-27 08:30:26 +1000 | [diff] [blame] | 838 | printk(KERN_ERR "EEH: unrecoverable slot failure %s\n", |
| 839 | pdn->node->full_name); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 840 | return -1; |
Linas Vepstas | e102926 | 2006-09-21 18:25:56 -0500 | [diff] [blame] | 841 | } |
Linas Vepstas | 12588da | 2007-07-27 08:30:26 +1000 | [diff] [blame] | 842 | printk(KERN_ERR "EEH: bus reset %d failed on slot %s, rc=%d\n", |
| 843 | i+1, pdn->node->full_name, rc); |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 844 | } |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 845 | |
Linas Vepstas | 9c54776 | 2007-03-19 14:58:07 -0500 | [diff] [blame] | 846 | return -1; |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 847 | } |
| 848 | |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 849 | /* ------------------------------------------------------- */ |
| 850 | /** Save and restore of PCI BARs |
| 851 | * |
| 852 | * Although firmware will set up BARs during boot, it doesn't |
| 853 | * set up device BAR's after a device reset, although it will, |
| 854 | * if requested, set up bridge configuration. Thus, we need to |
| 855 | * configure the PCI devices ourselves. |
| 856 | */ |
| 857 | |
| 858 | /** |
| 859 | * __restore_bars - Restore the Base Address Registers |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 860 | * @pdn: pci device node |
| 861 | * |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 862 | * Loads the PCI configuration space base address registers, |
| 863 | * the expansion ROM base address, the latency timer, and etc. |
| 864 | * from the saved values in the device node. |
| 865 | */ |
| 866 | static inline void __restore_bars (struct pci_dn *pdn) |
| 867 | { |
| 868 | int i; |
Mike Mason | cde274c | 2008-07-09 02:04:35 +1000 | [diff] [blame] | 869 | u32 cmd; |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 870 | |
| 871 | if (NULL==pdn->phb) return; |
| 872 | for (i=4; i<10; i++) { |
| 873 | rtas_write_config(pdn, i*4, 4, pdn->config_space[i]); |
| 874 | } |
| 875 | |
| 876 | /* 12 == Expansion ROM Address */ |
| 877 | rtas_write_config(pdn, 12*4, 4, pdn->config_space[12]); |
| 878 | |
| 879 | #define BYTE_SWAP(OFF) (8*((OFF)/4)+3-(OFF)) |
| 880 | #define SAVED_BYTE(OFF) (((u8 *)(pdn->config_space))[BYTE_SWAP(OFF)]) |
| 881 | |
| 882 | rtas_write_config (pdn, PCI_CACHE_LINE_SIZE, 1, |
| 883 | SAVED_BYTE(PCI_CACHE_LINE_SIZE)); |
| 884 | |
| 885 | rtas_write_config (pdn, PCI_LATENCY_TIMER, 1, |
| 886 | SAVED_BYTE(PCI_LATENCY_TIMER)); |
| 887 | |
| 888 | /* max latency, min grant, interrupt pin and line */ |
| 889 | rtas_write_config(pdn, 15*4, 4, pdn->config_space[15]); |
Mike Mason | cde274c | 2008-07-09 02:04:35 +1000 | [diff] [blame] | 890 | |
| 891 | /* Restore PERR & SERR bits, some devices require it, |
| 892 | don't touch the other command bits */ |
| 893 | rtas_read_config(pdn, PCI_COMMAND, 4, &cmd); |
| 894 | if (pdn->config_space[1] & PCI_COMMAND_PARITY) |
| 895 | cmd |= PCI_COMMAND_PARITY; |
| 896 | else |
| 897 | cmd &= ~PCI_COMMAND_PARITY; |
| 898 | if (pdn->config_space[1] & PCI_COMMAND_SERR) |
| 899 | cmd |= PCI_COMMAND_SERR; |
| 900 | else |
| 901 | cmd &= ~PCI_COMMAND_SERR; |
| 902 | rtas_write_config(pdn, PCI_COMMAND, 4, cmd); |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 903 | } |
| 904 | |
| 905 | /** |
| 906 | * eeh_restore_bars - restore the PCI config space info |
| 907 | * |
| 908 | * This routine performs a recursive walk to the children |
| 909 | * of this device as well. |
| 910 | */ |
| 911 | void eeh_restore_bars(struct pci_dn *pdn) |
| 912 | { |
| 913 | struct device_node *dn; |
| 914 | if (!pdn) |
| 915 | return; |
| 916 | |
Linas Vepstas | 7684b40 | 2005-11-03 18:55:19 -0600 | [diff] [blame] | 917 | if ((pdn->eeh_mode & EEH_MODE_SUPPORTED) && !IS_BRIDGE(pdn->class_code)) |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 918 | __restore_bars (pdn); |
| 919 | |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 920 | for_each_child_of_node(pdn->node, dn) |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 921 | eeh_restore_bars (PCI_DN(dn)); |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 922 | } |
| 923 | |
| 924 | /** |
| 925 | * eeh_save_bars - save device bars |
| 926 | * |
| 927 | * Save the values of the device bars. Unlike the restore |
| 928 | * routine, this routine is *not* recursive. This is because |
Justin Mattock | 31116f0 | 2011-02-24 20:10:18 +0000 | [diff] [blame] | 929 | * PCI devices are added individually; but, for the restore, |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 930 | * an entire slot is reset at a time. |
| 931 | */ |
Linas Vepstas | 7684b40 | 2005-11-03 18:55:19 -0600 | [diff] [blame] | 932 | static void eeh_save_bars(struct pci_dn *pdn) |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 933 | { |
| 934 | int i; |
| 935 | |
Linas Vepstas | 7684b40 | 2005-11-03 18:55:19 -0600 | [diff] [blame] | 936 | if (!pdn ) |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 937 | return; |
| 938 | |
| 939 | for (i = 0; i < 16; i++) |
Linas Vepstas | 7684b40 | 2005-11-03 18:55:19 -0600 | [diff] [blame] | 940 | rtas_read_config(pdn, i * 4, 4, &pdn->config_space[i]); |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 941 | } |
| 942 | |
| 943 | void |
| 944 | rtas_configure_bridge(struct pci_dn *pdn) |
| 945 | { |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 946 | int config_addr; |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 947 | int rc; |
Richard A. Lary | 65f47f1 | 2011-04-06 12:50:45 +0000 | [diff] [blame] | 948 | int token; |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 949 | |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 950 | /* Use PE configuration address, if present */ |
| 951 | config_addr = pdn->eeh_config_addr; |
| 952 | if (pdn->eeh_pe_config_addr) |
| 953 | config_addr = pdn->eeh_pe_config_addr; |
| 954 | |
Richard A. Lary | 65f47f1 | 2011-04-06 12:50:45 +0000 | [diff] [blame] | 955 | /* Use new configure-pe function, if supported */ |
| 956 | if (ibm_configure_pe != RTAS_UNKNOWN_SERVICE) |
| 957 | token = ibm_configure_pe; |
| 958 | else |
| 959 | token = ibm_configure_bridge; |
| 960 | |
| 961 | rc = rtas_call(token, 3, 1, NULL, |
Linas Vepstas | fcb7543 | 2005-11-03 18:54:39 -0600 | [diff] [blame] | 962 | config_addr, |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 963 | BUID_HI(pdn->phb->buid), |
| 964 | BUID_LO(pdn->phb->buid)); |
| 965 | if (rc) { |
| 966 | printk (KERN_WARNING "EEH: Unable to configure device bridge (%d) for %s\n", |
| 967 | rc, pdn->node->full_name); |
| 968 | } |
| 969 | } |
| 970 | |
Linas Vepstas | 6dee3fb | 2005-11-03 18:50:10 -0600 | [diff] [blame] | 971 | /* ------------------------------------------------------------- */ |
Linas Vepstas | 172ca92 | 2005-11-03 18:50:04 -0600 | [diff] [blame] | 972 | /* The code below deals with enabling EEH for devices during the |
| 973 | * early boot sequence. EEH must be enabled before any PCI probing |
| 974 | * can be done. |
| 975 | */ |
| 976 | |
| 977 | #define EEH_ENABLE 1 |
| 978 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | struct eeh_early_enable_info { |
| 980 | unsigned int buid_hi; |
| 981 | unsigned int buid_lo; |
| 982 | }; |
| 983 | |
Linas Vepstas | 147d6a3 | 2007-03-19 14:54:21 -0500 | [diff] [blame] | 984 | static int get_pe_addr (int config_addr, |
| 985 | struct eeh_early_enable_info *info) |
| 986 | { |
| 987 | unsigned int rets[3]; |
| 988 | int ret; |
| 989 | |
| 990 | /* Use latest config-addr token on power6 */ |
| 991 | if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) { |
| 992 | /* Make sure we have a PE in hand */ |
| 993 | ret = rtas_call (ibm_get_config_addr_info2, 4, 2, rets, |
| 994 | config_addr, info->buid_hi, info->buid_lo, 1); |
| 995 | if (ret || (rets[0]==0)) |
| 996 | return 0; |
| 997 | |
| 998 | ret = rtas_call (ibm_get_config_addr_info2, 4, 2, rets, |
| 999 | config_addr, info->buid_hi, info->buid_lo, 0); |
| 1000 | if (ret) |
| 1001 | return 0; |
| 1002 | return rets[0]; |
| 1003 | } |
| 1004 | |
| 1005 | /* Use older config-addr token on power5 */ |
| 1006 | if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) { |
| 1007 | ret = rtas_call (ibm_get_config_addr_info, 4, 2, rets, |
| 1008 | config_addr, info->buid_hi, info->buid_lo, 0); |
| 1009 | if (ret) |
| 1010 | return 0; |
| 1011 | return rets[0]; |
| 1012 | } |
| 1013 | return 0; |
| 1014 | } |
| 1015 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | /* Enable eeh for the given device node. */ |
| 1017 | static void *early_enable_eeh(struct device_node *dn, void *data) |
| 1018 | { |
Linas Vepstas | 25c4a46 | 2007-01-26 14:55:03 -0600 | [diff] [blame] | 1019 | unsigned int rets[3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | struct eeh_early_enable_info *info = data; |
| 1021 | int ret; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 1022 | const u32 *class_code = of_get_property(dn, "class-code", NULL); |
| 1023 | const u32 *vendor_id = of_get_property(dn, "vendor-id", NULL); |
| 1024 | const u32 *device_id = of_get_property(dn, "device-id", NULL); |
Jeremy Kerr | 954a46e | 2006-07-12 15:39:43 +1000 | [diff] [blame] | 1025 | const u32 *regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | int enable; |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 1027 | struct pci_dn *pdn = PCI_DN(dn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
linas | 0f17574 | 2005-12-01 18:42:32 -0600 | [diff] [blame] | 1029 | pdn->class_code = 0; |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 1030 | pdn->eeh_mode = 0; |
Linas Vepstas | 5c1344e | 2005-11-03 18:49:31 -0600 | [diff] [blame] | 1031 | pdn->eeh_check_count = 0; |
| 1032 | pdn->eeh_freeze_count = 0; |
Linas Vepstas | 858955b | 2007-05-24 03:20:51 +1000 | [diff] [blame] | 1033 | pdn->eeh_false_positives = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
Nathan Lynch | c6d4d5a | 2008-03-14 06:52:10 +1100 | [diff] [blame] | 1035 | if (!of_device_is_available(dn)) |
| 1036 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
| 1038 | /* Ignore bad nodes. */ |
| 1039 | if (!class_code || !vendor_id || !device_id) |
| 1040 | return NULL; |
| 1041 | |
| 1042 | /* There is nothing to check on PCI to ISA bridges */ |
| 1043 | if (dn->type && !strcmp(dn->type, "isa")) { |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 1044 | pdn->eeh_mode |= EEH_MODE_NOCHECK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | return NULL; |
| 1046 | } |
linas | 0f17574 | 2005-12-01 18:42:32 -0600 | [diff] [blame] | 1047 | pdn->class_code = *class_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | /* Ok... see if this device supports EEH. Some do, some don't, |
| 1050 | * and the only way to find out is to check each and every one. */ |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 1051 | regs = of_get_property(dn, "reg", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | if (regs) { |
| 1053 | /* First register entry is addr (00BBSS00) */ |
| 1054 | /* Try to enable eeh */ |
| 1055 | ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL, |
Linas Vepstas | 172ca92 | 2005-11-03 18:50:04 -0600 | [diff] [blame] | 1056 | regs[0], info->buid_hi, info->buid_lo, |
| 1057 | EEH_ENABLE); |
| 1058 | |
Linas Vepstas | 25c4a46 | 2007-01-26 14:55:03 -0600 | [diff] [blame] | 1059 | enable = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | if (ret == 0) { |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 1061 | pdn->eeh_config_addr = regs[0]; |
Linas Vepstas | 25e591f | 2005-11-03 18:53:20 -0600 | [diff] [blame] | 1062 | |
| 1063 | /* If the newer, better, ibm,get-config-addr-info is supported, |
| 1064 | * then use that instead. */ |
Linas Vepstas | 147d6a3 | 2007-03-19 14:54:21 -0500 | [diff] [blame] | 1065 | pdn->eeh_pe_config_addr = get_pe_addr(pdn->eeh_config_addr, info); |
Linas Vepstas | 25c4a46 | 2007-01-26 14:55:03 -0600 | [diff] [blame] | 1066 | |
| 1067 | /* Some older systems (Power4) allow the |
| 1068 | * ibm,set-eeh-option call to succeed even on nodes |
| 1069 | * where EEH is not supported. Verify support |
| 1070 | * explicitly. */ |
| 1071 | ret = read_slot_reset_state(pdn, rets); |
| 1072 | if ((ret == 0) && (rets[1] == 1)) |
| 1073 | enable = 1; |
| 1074 | } |
| 1075 | |
| 1076 | if (enable) { |
| 1077 | eeh_subsystem_enabled = 1; |
| 1078 | pdn->eeh_mode |= EEH_MODE_SUPPORTED; |
| 1079 | |
Benjamin Herrenschmidt | 57b066f | 2008-10-27 19:48:41 +0000 | [diff] [blame] | 1080 | pr_debug("EEH: %s: eeh enabled, config=%x pe_config=%x\n", |
| 1081 | dn->full_name, pdn->eeh_config_addr, |
| 1082 | pdn->eeh_pe_config_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | } else { |
| 1084 | |
| 1085 | /* This device doesn't support EEH, but it may have an |
| 1086 | * EEH parent, in which case we mark it as supported. */ |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 1087 | if (dn->parent && PCI_DN(dn->parent) |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 1088 | && (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | /* Parent supports EEH. */ |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 1090 | pdn->eeh_mode |= EEH_MODE_SUPPORTED; |
| 1091 | pdn->eeh_config_addr = PCI_DN(dn->parent)->eeh_config_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | return NULL; |
| 1093 | } |
| 1094 | } |
| 1095 | } else { |
| 1096 | printk(KERN_WARNING "EEH: %s: unable to get reg property.\n", |
| 1097 | dn->full_name); |
| 1098 | } |
| 1099 | |
Linas Vepstas | 7684b40 | 2005-11-03 18:55:19 -0600 | [diff] [blame] | 1100 | eeh_save_bars(pdn); |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 1101 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | } |
| 1103 | |
| 1104 | /* |
| 1105 | * Initialize EEH by trying to enable it for all of the adapters in the system. |
| 1106 | * As a side effect we can determine here if eeh is supported at all. |
| 1107 | * Note that we leave EEH on so failed config cycles won't cause a machine |
| 1108 | * check. If a user turns off EEH for a particular adapter they are really |
| 1109 | * telling Linux to ignore errors. Some hardware (e.g. POWER5) won't |
| 1110 | * grant access to a slot if EEH isn't enabled, and so we always enable |
| 1111 | * EEH for all slots/all devices. |
| 1112 | * |
| 1113 | * The eeh-force-off option disables EEH checking globally, for all slots. |
| 1114 | * Even if force-off is set, the EEH hardware is still enabled, so that |
| 1115 | * newer systems can boot. |
| 1116 | */ |
| 1117 | void __init eeh_init(void) |
| 1118 | { |
| 1119 | struct device_node *phb, *np; |
| 1120 | struct eeh_early_enable_info info; |
| 1121 | |
Thomas Gleixner | 3d37262 | 2010-02-18 02:23:07 +0000 | [diff] [blame] | 1122 | raw_spin_lock_init(&confirm_error_lock); |
Linas Vepstas | df7242b | 2005-11-03 18:49:01 -0600 | [diff] [blame] | 1123 | spin_lock_init(&slot_errbuf_lock); |
| 1124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | np = of_find_node_by_path("/rtas"); |
| 1126 | if (np == NULL) |
| 1127 | return; |
| 1128 | |
| 1129 | ibm_set_eeh_option = rtas_token("ibm,set-eeh-option"); |
| 1130 | ibm_set_slot_reset = rtas_token("ibm,set-slot-reset"); |
| 1131 | ibm_read_slot_reset_state2 = rtas_token("ibm,read-slot-reset-state2"); |
| 1132 | ibm_read_slot_reset_state = rtas_token("ibm,read-slot-reset-state"); |
| 1133 | ibm_slot_error_detail = rtas_token("ibm,slot-error-detail"); |
Linas Vepstas | 25e591f | 2005-11-03 18:53:20 -0600 | [diff] [blame] | 1134 | ibm_get_config_addr_info = rtas_token("ibm,get-config-addr-info"); |
Linas Vepstas | 147d6a3 | 2007-03-19 14:54:21 -0500 | [diff] [blame] | 1135 | ibm_get_config_addr_info2 = rtas_token("ibm,get-config-addr-info2"); |
Linas Vepstas | 21e464d | 2005-11-03 18:54:47 -0600 | [diff] [blame] | 1136 | ibm_configure_bridge = rtas_token ("ibm,configure-bridge"); |
Richard A. Lary | 65f47f1 | 2011-04-06 12:50:45 +0000 | [diff] [blame] | 1137 | ibm_configure_pe = rtas_token("ibm,configure-pe"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | |
| 1139 | if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE) |
| 1140 | return; |
| 1141 | |
| 1142 | eeh_error_buf_size = rtas_token("rtas-error-log-max"); |
| 1143 | if (eeh_error_buf_size == RTAS_UNKNOWN_SERVICE) { |
| 1144 | eeh_error_buf_size = 1024; |
| 1145 | } |
| 1146 | if (eeh_error_buf_size > RTAS_ERROR_LOG_MAX) { |
| 1147 | printk(KERN_WARNING "EEH: rtas-error-log-max is bigger than allocated " |
| 1148 | "buffer ! (%d vs %d)", eeh_error_buf_size, RTAS_ERROR_LOG_MAX); |
| 1149 | eeh_error_buf_size = RTAS_ERROR_LOG_MAX; |
| 1150 | } |
| 1151 | |
| 1152 | /* Enable EEH for all adapters. Note that eeh requires buid's */ |
| 1153 | for (phb = of_find_node_by_name(NULL, "pci"); phb; |
| 1154 | phb = of_find_node_by_name(phb, "pci")) { |
| 1155 | unsigned long buid; |
| 1156 | |
| 1157 | buid = get_phb_buid(phb); |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 1158 | if (buid == 0 || PCI_DN(phb) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | continue; |
| 1160 | |
| 1161 | info.buid_lo = BUID_LO(buid); |
| 1162 | info.buid_hi = BUID_HI(buid); |
| 1163 | traverse_pci_devices(phb, early_enable_eeh, &info); |
| 1164 | } |
| 1165 | |
| 1166 | if (eeh_subsystem_enabled) |
| 1167 | printk(KERN_INFO "EEH: PCI Enhanced I/O Error Handling Enabled\n"); |
| 1168 | else |
| 1169 | printk(KERN_WARNING "EEH: No capable adapters found\n"); |
| 1170 | } |
| 1171 | |
| 1172 | /** |
| 1173 | * eeh_add_device_early - enable EEH for the indicated device_node |
| 1174 | * @dn: device node for which to set up EEH |
| 1175 | * |
| 1176 | * This routine must be used to perform EEH initialization for PCI |
| 1177 | * devices that were added after system boot (e.g. hotplug, dlpar). |
| 1178 | * This routine must be called before any i/o is performed to the |
| 1179 | * adapter (inluding any config-space i/o). |
| 1180 | * Whether this actually enables EEH or not for this device depends |
| 1181 | * on the CEC architecture, type of the device, on earlier boot |
| 1182 | * command-line arguments & etc. |
| 1183 | */ |
Nathan Fontenot | 794e085 | 2006-03-31 12:04:52 -0600 | [diff] [blame] | 1184 | static void eeh_add_device_early(struct device_node *dn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | { |
| 1186 | struct pci_controller *phb; |
| 1187 | struct eeh_early_enable_info info; |
| 1188 | |
Linas Vepstas | 6937650 | 2005-11-03 18:47:50 -0600 | [diff] [blame] | 1189 | if (!dn || !PCI_DN(dn)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | return; |
Paul Mackerras | 1635317 | 2005-09-06 13:17:54 +1000 | [diff] [blame] | 1191 | phb = PCI_DN(dn)->phb; |
Linas Vepstas | f751f84 | 2005-11-03 18:54:23 -0600 | [diff] [blame] | 1192 | |
| 1193 | /* USB Bus children of PCI devices will not have BUID's */ |
| 1194 | if (NULL == phb || 0 == phb->buid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
| 1197 | info.buid_hi = BUID_HI(phb->buid); |
| 1198 | info.buid_lo = BUID_LO(phb->buid); |
| 1199 | early_enable_eeh(dn, &info); |
| 1200 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | |
Linas Vepstas | e2a296e | 2005-11-03 18:51:31 -0600 | [diff] [blame] | 1202 | void eeh_add_device_tree_early(struct device_node *dn) |
| 1203 | { |
| 1204 | struct device_node *sib; |
Stephen Rothwell | acaa617 | 2007-12-21 15:52:07 +1100 | [diff] [blame] | 1205 | |
| 1206 | for_each_child_of_node(dn, sib) |
Linas Vepstas | e2a296e | 2005-11-03 18:51:31 -0600 | [diff] [blame] | 1207 | eeh_add_device_tree_early(sib); |
| 1208 | eeh_add_device_early(dn); |
| 1209 | } |
| 1210 | EXPORT_SYMBOL_GPL(eeh_add_device_tree_early); |
| 1211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | /** |
| 1213 | * eeh_add_device_late - perform EEH initialization for the indicated pci device |
| 1214 | * @dev: pci device for which to set up EEH |
| 1215 | * |
| 1216 | * This routine must be used to complete EEH initialization for PCI |
| 1217 | * devices that were added after system boot (e.g. hotplug, dlpar). |
| 1218 | */ |
Nathan Fontenot | 794e085 | 2006-03-31 12:04:52 -0600 | [diff] [blame] | 1219 | static void eeh_add_device_late(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | { |
Linas Vepstas | 56b0fca | 2005-11-03 18:48:45 -0600 | [diff] [blame] | 1221 | struct device_node *dn; |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 1222 | struct pci_dn *pdn; |
Linas Vepstas | 56b0fca | 2005-11-03 18:48:45 -0600 | [diff] [blame] | 1223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | if (!dev || !eeh_subsystem_enabled) |
| 1225 | return; |
| 1226 | |
Benjamin Herrenschmidt | 57b066f | 2008-10-27 19:48:41 +0000 | [diff] [blame] | 1227 | pr_debug("EEH: Adding device %s\n", pci_name(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | |
Linas Vepstas | 56b0fca | 2005-11-03 18:48:45 -0600 | [diff] [blame] | 1229 | dn = pci_device_to_OF_node(dev); |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 1230 | pdn = PCI_DN(dn); |
Benjamin Herrenschmidt | 57b066f | 2008-10-27 19:48:41 +0000 | [diff] [blame] | 1231 | if (pdn->pcidev == dev) { |
| 1232 | pr_debug("EEH: Already referenced !\n"); |
| 1233 | return; |
| 1234 | } |
| 1235 | WARN_ON(pdn->pcidev); |
| 1236 | |
| 1237 | pci_dev_get (dev); |
Linas Vepstas | 8b553f3 | 2005-11-03 18:50:17 -0600 | [diff] [blame] | 1238 | pdn->pcidev = dev; |
Linas Vepstas | 56b0fca | 2005-11-03 18:48:45 -0600 | [diff] [blame] | 1239 | |
Linas Vepstas | e1d04c9 | 2007-05-24 03:16:46 +1000 | [diff] [blame] | 1240 | pci_addr_cache_insert_device(dev); |
| 1241 | eeh_sysfs_add_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | } |
Nathan Fontenot | 794e085 | 2006-03-31 12:04:52 -0600 | [diff] [blame] | 1243 | |
| 1244 | void eeh_add_device_tree_late(struct pci_bus *bus) |
| 1245 | { |
| 1246 | struct pci_dev *dev; |
| 1247 | |
| 1248 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 1249 | eeh_add_device_late(dev); |
| 1250 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { |
| 1251 | struct pci_bus *subbus = dev->subordinate; |
| 1252 | if (subbus) |
| 1253 | eeh_add_device_tree_late(subbus); |
| 1254 | } |
| 1255 | } |
| 1256 | } |
| 1257 | EXPORT_SYMBOL_GPL(eeh_add_device_tree_late); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | |
| 1259 | /** |
| 1260 | * eeh_remove_device - undo EEH setup for the indicated pci device |
| 1261 | * @dev: pci device to be removed |
| 1262 | * |
Nathan Fontenot | 794e085 | 2006-03-31 12:04:52 -0600 | [diff] [blame] | 1263 | * This routine should be called when a device is removed from |
| 1264 | * a running system (e.g. by hotplug or dlpar). It unregisters |
| 1265 | * the PCI device from the EEH subsystem. I/O errors affecting |
| 1266 | * this device will no longer be detected after this call; thus, |
| 1267 | * i/o errors affecting this slot may leave this device unusable. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | */ |
Nathan Fontenot | 794e085 | 2006-03-31 12:04:52 -0600 | [diff] [blame] | 1269 | static void eeh_remove_device(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | { |
Linas Vepstas | 56b0fca | 2005-11-03 18:48:45 -0600 | [diff] [blame] | 1271 | struct device_node *dn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | if (!dev || !eeh_subsystem_enabled) |
| 1273 | return; |
| 1274 | |
| 1275 | /* Unregister the device with the EEH/PCI address search system */ |
Benjamin Herrenschmidt | 57b066f | 2008-10-27 19:48:41 +0000 | [diff] [blame] | 1276 | pr_debug("EEH: Removing device %s\n", pci_name(dev)); |
Linas Vepstas | 56b0fca | 2005-11-03 18:48:45 -0600 | [diff] [blame] | 1277 | |
| 1278 | dn = pci_device_to_OF_node(dev); |
Benjamin Herrenschmidt | 57b066f | 2008-10-27 19:48:41 +0000 | [diff] [blame] | 1279 | if (PCI_DN(dn)->pcidev == NULL) { |
| 1280 | pr_debug("EEH: Not referenced !\n"); |
| 1281 | return; |
Linas Vepstas | b055a9e | 2006-04-06 15:41:41 -0500 | [diff] [blame] | 1282 | } |
Benjamin Herrenschmidt | 57b066f | 2008-10-27 19:48:41 +0000 | [diff] [blame] | 1283 | PCI_DN(dn)->pcidev = NULL; |
| 1284 | pci_dev_put (dev); |
| 1285 | |
| 1286 | pci_addr_cache_remove_device(dev); |
| 1287 | eeh_sysfs_remove_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
Linas Vepstas | e2a296e | 2005-11-03 18:51:31 -0600 | [diff] [blame] | 1290 | void eeh_remove_bus_device(struct pci_dev *dev) |
| 1291 | { |
Nathan Fontenot | 794e085 | 2006-03-31 12:04:52 -0600 | [diff] [blame] | 1292 | struct pci_bus *bus = dev->subordinate; |
| 1293 | struct pci_dev *child, *tmp; |
| 1294 | |
Linas Vepstas | e2a296e | 2005-11-03 18:51:31 -0600 | [diff] [blame] | 1295 | eeh_remove_device(dev); |
Nathan Fontenot | 794e085 | 2006-03-31 12:04:52 -0600 | [diff] [blame] | 1296 | |
| 1297 | if (bus && dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { |
| 1298 | list_for_each_entry_safe(child, tmp, &bus->devices, bus_list) |
| 1299 | eeh_remove_bus_device(child); |
Linas Vepstas | e2a296e | 2005-11-03 18:51:31 -0600 | [diff] [blame] | 1300 | } |
| 1301 | } |
| 1302 | EXPORT_SYMBOL_GPL(eeh_remove_bus_device); |
| 1303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | static int proc_eeh_show(struct seq_file *m, void *v) |
| 1305 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | if (0 == eeh_subsystem_enabled) { |
| 1307 | seq_printf(m, "EEH Subsystem is globally disabled\n"); |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 1308 | seq_printf(m, "eeh_total_mmio_ffs=%ld\n", total_mmio_ffs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | } else { |
| 1310 | seq_printf(m, "EEH Subsystem is enabled\n"); |
Linas Vepstas | 177bc93 | 2005-11-03 18:48:52 -0600 | [diff] [blame] | 1311 | seq_printf(m, |
| 1312 | "no device=%ld\n" |
| 1313 | "no device node=%ld\n" |
| 1314 | "no config address=%ld\n" |
| 1315 | "check not wanted=%ld\n" |
| 1316 | "eeh_total_mmio_ffs=%ld\n" |
| 1317 | "eeh_false_positives=%ld\n" |
Linas Vepstas | 177bc93 | 2005-11-03 18:48:52 -0600 | [diff] [blame] | 1318 | "eeh_slot_resets=%ld\n", |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 1319 | no_device, no_dn, no_cfg_addr, |
| 1320 | ignored_check, total_mmio_ffs, |
Linas Vepstas | 42253a6 | 2007-05-24 03:23:38 +1000 | [diff] [blame] | 1321 | false_positives, |
Linas Vepstas | 257ffc6 | 2005-11-03 18:55:25 -0600 | [diff] [blame] | 1322 | slot_resets); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | } |
| 1324 | |
| 1325 | return 0; |
| 1326 | } |
| 1327 | |
| 1328 | static int proc_eeh_open(struct inode *inode, struct file *file) |
| 1329 | { |
| 1330 | return single_open(file, proc_eeh_show, NULL); |
| 1331 | } |
| 1332 | |
Arjan van de Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 1333 | static const struct file_operations proc_eeh_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | .open = proc_eeh_open, |
| 1335 | .read = seq_read, |
| 1336 | .llseek = seq_lseek, |
| 1337 | .release = single_release, |
| 1338 | }; |
| 1339 | |
| 1340 | static int __init eeh_init_proc(void) |
| 1341 | { |
Denis V. Lunev | 6674713 | 2008-04-29 01:02:26 -0700 | [diff] [blame] | 1342 | if (machine_is(pseries)) |
Thadeu Lima de Souza Cascardo | 8feaa43 | 2011-08-26 10:36:31 +0000 | [diff] [blame] | 1343 | proc_create("powerpc/eeh", 0, NULL, &proc_eeh_operations); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | return 0; |
| 1345 | } |
| 1346 | __initcall(eeh_init_proc); |