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)
245 * pseries_eeh_reset - Reset the specified PE
246 * @dn: PE associated device node
247 * @option: reset option
249 * Reset the specified PE
251 static int pseries_eeh_reset(struct device_node *dn, int option)
257 * pseries_eeh_wait_state - Wait for PE state
258 * @dn: PE associated device node
259 * @max_wait: maximal period in microsecond
261 * Wait for the state of associated PE. It might take some time
262 * to retrieve the PE's state.
264 static int pseries_eeh_wait_state(struct device_node *dn, int max_wait)
270 * pseries_eeh_get_log - Retrieve error log
272 * @severity: temporary or permanent error log
273 * @drv_log: driver log to be combined with retrieved error log
274 * @len: length of driver log
276 * Retrieve the temporary or permanent error from the PE.
277 * Actually, the error will be retrieved through the dedicated
280 static int pseries_eeh_get_log(struct device_node *dn, int severity, char *drv_log, unsigned long len)
286 * pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE
287 * @dn: PE associated device node
289 * The function will be called to reconfigure the bridges included
290 * in the specified PE so that the mulfunctional PE would be recovered
293 static int pseries_eeh_configure_bridge(struct device_node *dn)
298 static struct eeh_ops pseries_eeh_ops = {
300 .init = pseries_eeh_init,
301 .set_option = pseries_eeh_set_option,
302 .get_pe_addr = pseries_eeh_get_pe_addr,
303 .get_state = pseries_eeh_get_state,
304 .reset = pseries_eeh_reset,
305 .wait_state = pseries_eeh_wait_state,
306 .get_log = pseries_eeh_get_log,
307 .configure_bridge = pseries_eeh_configure_bridge
311 * eeh_pseries_init - Register platform dependent EEH operations
313 * EEH initialization on pseries platform. This function should be
314 * called before any EEH related functions.
316 int __init eeh_pseries_init(void)
318 return eeh_ops_register(&pseries_eeh_ops);