2 * The file intends to implement the platform dependent EEH operations on pseries.
3 * Actually, the pseries platform is built based on RTAS heavily. That means the
4 * pseries platform dependent EEH operations will be built on RTAS calls. The functions
5 * are devired from arch/powerpc/platforms/pseries/eeh.c and necessary cleanup has
8 * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2011.
9 * Copyright IBM Corporation 2001, 2005, 2006
10 * Copyright Dave Engebretsen & Todd Inglett 2001
11 * Copyright Linas Vepstas 2005, 2006
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #include <linux/atomic.h>
29 #include <linux/delay.h>
30 #include <linux/export.h>
31 #include <linux/init.h>
32 #include <linux/list.h>
34 #include <linux/pci.h>
35 #include <linux/proc_fs.h>
36 #include <linux/rbtree.h>
37 #include <linux/sched.h>
38 #include <linux/seq_file.h>
39 #include <linux/spinlock.h>
42 #include <asm/eeh_event.h>
44 #include <asm/machdep.h>
45 #include <asm/ppc-pci.h>
49 static int ibm_set_eeh_option;
50 static int ibm_set_slot_reset;
51 static int ibm_read_slot_reset_state;
52 static int ibm_read_slot_reset_state2;
53 static int ibm_slot_error_detail;
54 static int ibm_get_config_addr_info;
55 static int ibm_get_config_addr_info2;
56 static int ibm_configure_bridge;
57 static int ibm_configure_pe;
60 * pseries_eeh_init - EEH platform dependent initialization
62 * EEH platform dependent initialization on pseries.
64 static int pseries_eeh_init(void)
66 /* figure out EEH RTAS function call tokens */
67 ibm_set_eeh_option = rtas_token("ibm,set-eeh-option");
68 ibm_set_slot_reset = rtas_token("ibm,set-slot-reset");
69 ibm_read_slot_reset_state2 = rtas_token("ibm,read-slot-reset-state2");
70 ibm_read_slot_reset_state = rtas_token("ibm,read-slot-reset-state");
71 ibm_slot_error_detail = rtas_token("ibm,slot-error-detail");
72 ibm_get_config_addr_info2 = rtas_token("ibm,get-config-addr-info2");
73 ibm_get_config_addr_info = rtas_token("ibm,get-config-addr-info");
74 ibm_configure_pe = rtas_token("ibm,configure-pe");
75 ibm_configure_bridge = rtas_token ("ibm,configure-bridge");
77 /* necessary sanity check */
78 if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE) {
79 pr_warning("%s: RTAS service <ibm,set-eeh-option> invalid\n",
82 } else if (ibm_set_slot_reset == RTAS_UNKNOWN_SERVICE) {
83 pr_warning("%s: RTAS service <ibm, set-slot-reset> invalid\n",
86 } else if (ibm_read_slot_reset_state2 == RTAS_UNKNOWN_SERVICE &&
87 ibm_read_slot_reset_state == RTAS_UNKNOWN_SERVICE) {
88 pr_warning("%s: RTAS service <ibm,read-slot-reset-state2> and "
89 "<ibm,read-slot-reset-state> invalid\n",
92 } else if (ibm_slot_error_detail == RTAS_UNKNOWN_SERVICE) {
93 pr_warning("%s: RTAS service <ibm,slot-error-detail> invalid\n",
96 } else if (ibm_get_config_addr_info2 == RTAS_UNKNOWN_SERVICE &&
97 ibm_get_config_addr_info == RTAS_UNKNOWN_SERVICE) {
98 pr_warning("%s: RTAS service <ibm,get-config-addr-info2> and "
99 "<ibm,get-config-addr-info> invalid\n",
102 } else if (ibm_configure_pe == RTAS_UNKNOWN_SERVICE &&
103 ibm_configure_bridge == RTAS_UNKNOWN_SERVICE) {
104 pr_warning("%s: RTAS service <ibm,configure-pe> and "
105 "<ibm,configure-bridge> invalid\n",
114 * pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable
116 * @option: operation to be issued
118 * The function is used to control the EEH functionality globally.
119 * Currently, following options are support according to PAPR:
120 * Enable EEH, Disable EEH, Enable MMIO and Enable DMA
122 static int pseries_eeh_set_option(struct device_node *dn, int option)
132 * When we're enabling or disabling EEH functioality on
133 * the particular PE, the PE config address is possibly
134 * unavailable. Therefore, we have to figure it out from
138 case EEH_OPT_DISABLE:
140 reg = of_get_property(dn, "reg", NULL);
141 config_addr = reg[0];
144 case EEH_OPT_THAW_MMIO:
145 case EEH_OPT_THAW_DMA:
146 config_addr = pdn->eeh_config_addr;
147 if (pdn->eeh_pe_config_addr)
148 config_addr = pdn->eeh_pe_config_addr;
152 pr_err("%s: Invalid option %d\n",
157 ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL,
158 config_addr, BUID_HI(pdn->phb->buid),
159 BUID_LO(pdn->phb->buid), option);
165 * pseries_eeh_get_pe_addr - Retrieve PE address
168 * Retrieve the assocated PE address. Actually, there're 2 RTAS
169 * function calls dedicated for the purpose. We need implement
170 * it through the new function and then the old one. Besides,
171 * you should make sure the config address is figured out from
172 * FDT node before calling the function.
174 * It's notable that zero'ed return value means invalid PE config
177 static int pseries_eeh_get_pe_addr(struct device_node *dn)
185 if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) {
187 * First of all, we need to make sure there has one PE
188 * associated with the device. Otherwise, PE address is
191 ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
192 pdn->eeh_config_addr, BUID_HI(pdn->phb->buid),
193 BUID_LO(pdn->phb->buid), 1);
194 if (ret || (rets[0] == 0))
197 /* Retrieve the associated PE config address */
198 ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
199 pdn->eeh_config_addr, BUID_HI(pdn->phb->buid),
200 BUID_LO(pdn->phb->buid), 0);
202 pr_warning("%s: Failed to get PE address for %s\n",
203 __func__, dn->full_name);
210 if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
211 ret = rtas_call(ibm_get_config_addr_info, 4, 2, rets,
212 pdn->eeh_config_addr, BUID_HI(pdn->phb->buid),
213 BUID_LO(pdn->phb->buid), 0);
215 pr_warning("%s: Failed to get PE address for %s\n",
216 __func__, dn->full_name);
227 * pseries_eeh_get_state - Retrieve PE state
228 * @dn: PE associated device node
229 * @state: return value
231 * Retrieve the state of the specified PE. On RTAS compliant
232 * pseries platform, there already has one dedicated RTAS function
233 * for the purpose. It's notable that the associated PE config address
234 * might be ready when calling the function. Therefore, endeavour to
235 * use the PE config address if possible. Further more, there're 2
236 * RTAS calls for the purpose, we need to try the new one and back
237 * to the old one if the new one couldn't work properly.
239 static int pseries_eeh_get_state(struct device_node *dn, int *state)
247 /* Figure out PE config address if possible */
249 config_addr = pdn->eeh_config_addr;
250 if (pdn->eeh_pe_config_addr)
251 config_addr = pdn->eeh_pe_config_addr;
253 if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) {
254 ret = rtas_call(ibm_read_slot_reset_state2, 3, 4, rets,
255 config_addr, BUID_HI(pdn->phb->buid),
256 BUID_LO(pdn->phb->buid));
257 } else if (ibm_read_slot_reset_state != RTAS_UNKNOWN_SERVICE) {
258 /* Fake PE unavailable info */
260 ret = rtas_call(ibm_read_slot_reset_state, 3, 3, rets,
261 config_addr, BUID_HI(pdn->phb->buid),
262 BUID_LO(pdn->phb->buid));
264 return EEH_STATE_NOT_SUPPORT;
270 /* Parse the result out */
275 result &= ~EEH_STATE_RESET_ACTIVE;
276 result |= EEH_STATE_MMIO_ACTIVE;
277 result |= EEH_STATE_DMA_ACTIVE;
280 result |= EEH_STATE_RESET_ACTIVE;
281 result |= EEH_STATE_MMIO_ACTIVE;
282 result |= EEH_STATE_DMA_ACTIVE;
285 result &= ~EEH_STATE_RESET_ACTIVE;
286 result &= ~EEH_STATE_MMIO_ACTIVE;
287 result &= ~EEH_STATE_DMA_ACTIVE;
290 result &= ~EEH_STATE_RESET_ACTIVE;
291 result &= ~EEH_STATE_MMIO_ACTIVE;
292 result &= ~EEH_STATE_DMA_ACTIVE;
293 result |= EEH_STATE_MMIO_ENABLED;
297 if (state) *state = rets[2];
298 result = EEH_STATE_UNAVAILABLE;
300 result = EEH_STATE_NOT_SUPPORT;
303 result = EEH_STATE_NOT_SUPPORT;
306 result = EEH_STATE_NOT_SUPPORT;
313 * pseries_eeh_reset - Reset the specified PE
314 * @dn: PE associated device node
315 * @option: reset option
317 * Reset the specified PE
319 static int pseries_eeh_reset(struct device_node *dn, int option)
325 * pseries_eeh_wait_state - Wait for PE state
326 * @dn: PE associated device node
327 * @max_wait: maximal period in microsecond
329 * Wait for the state of associated PE. It might take some time
330 * to retrieve the PE's state.
332 static int pseries_eeh_wait_state(struct device_node *dn, int max_wait)
338 * According to PAPR, the state of PE might be temporarily
339 * unavailable. Under the circumstance, we have to wait
340 * for indicated time determined by firmware. The maximal
341 * wait time is 5 minutes, which is acquired from the original
342 * EEH implementation. Also, the original implementation
343 * also defined the minimal wait time as 1 second.
345 #define EEH_STATE_MIN_WAIT_TIME (1000)
346 #define EEH_STATE_MAX_WAIT_TIME (300 * 1000)
349 ret = pseries_eeh_get_state(dn, &mwait);
352 * If the PE's state is temporarily unavailable,
353 * we have to wait for the specified time. Otherwise,
354 * the PE's state will be returned immediately.
356 if (ret != EEH_STATE_UNAVAILABLE)
360 pr_warning("%s: Timeout when getting PE's state (%d)\n",
362 return EEH_STATE_NOT_SUPPORT;
366 pr_warning("%s: Firmware returned bad wait value %d\n",
368 mwait = EEH_STATE_MIN_WAIT_TIME;
369 } else if (mwait > EEH_STATE_MAX_WAIT_TIME) {
370 pr_warning("%s: Firmware returned too long wait value %d\n",
372 mwait = EEH_STATE_MAX_WAIT_TIME;
379 return EEH_STATE_NOT_SUPPORT;
383 * pseries_eeh_get_log - Retrieve error log
385 * @severity: temporary or permanent error log
386 * @drv_log: driver log to be combined with retrieved error log
387 * @len: length of driver log
389 * Retrieve the temporary or permanent error from the PE.
390 * Actually, the error will be retrieved through the dedicated
393 static int pseries_eeh_get_log(struct device_node *dn, int severity, char *drv_log, unsigned long len)
399 * pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE
400 * @dn: PE associated device node
402 * The function will be called to reconfigure the bridges included
403 * in the specified PE so that the mulfunctional PE would be recovered
406 static int pseries_eeh_configure_bridge(struct device_node *dn)
411 static struct eeh_ops pseries_eeh_ops = {
413 .init = pseries_eeh_init,
414 .set_option = pseries_eeh_set_option,
415 .get_pe_addr = pseries_eeh_get_pe_addr,
416 .get_state = pseries_eeh_get_state,
417 .reset = pseries_eeh_reset,
418 .wait_state = pseries_eeh_wait_state,
419 .get_log = pseries_eeh_get_log,
420 .configure_bridge = pseries_eeh_configure_bridge
424 * eeh_pseries_init - Register platform dependent EEH operations
426 * EEH initialization on pseries platform. This function should be
427 * called before any EEH related functions.
429 int __init eeh_pseries_init(void)
431 return eeh_ops_register(&pseries_eeh_ops);