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 * pseries_eeh_init - EEH platform dependent initialization
51 * EEH platform dependent initialization on pseries.
53 static int pseries_eeh_init(void)
59 * pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable
61 * @option: operation to be issued
63 * The function is used to control the EEH functionality globally.
64 * Currently, following options are support according to PAPR:
65 * Enable EEH, Disable EEH, Enable MMIO and Enable DMA
67 static int pseries_eeh_set_option(struct device_node *dn, int option)
73 * pseries_eeh_get_pe_addr - Retrieve PE address
76 * Retrieve the assocated PE address. Actually, there're 2 RTAS
77 * function calls dedicated for the purpose. We need implement
78 * it through the new function and then the old one. Besides,
79 * you should make sure the config address is figured out from
80 * FDT node before calling the function.
82 * It's notable that zero'ed return value means invalid PE config
85 static int pseries_eeh_get_pe_addr(struct device_node *dn)
91 * pseries_eeh_get_state - Retrieve PE state
92 * @dn: PE associated device node
93 * @state: return value
95 * Retrieve the state of the specified PE. On RTAS compliant
96 * pseries platform, there already has one dedicated RTAS function
97 * for the purpose. It's notable that the associated PE config address
98 * might be ready when calling the function. Therefore, endeavour to
99 * use the PE config address if possible. Further more, there're 2
100 * RTAS calls for the purpose, we need to try the new one and back
101 * to the old one if the new one couldn't work properly.
103 static int pseries_eeh_get_state(struct device_node *dn, int *state)
109 * pseries_eeh_reset - Reset the specified PE
110 * @dn: PE associated device node
111 * @option: reset option
113 * Reset the specified PE
115 static int pseries_eeh_reset(struct device_node *dn, int option)
121 * pseries_eeh_wait_state - Wait for PE state
122 * @dn: PE associated device node
123 * @max_wait: maximal period in microsecond
125 * Wait for the state of associated PE. It might take some time
126 * to retrieve the PE's state.
128 static int pseries_eeh_wait_state(struct device_node *dn, int max_wait)
134 * pseries_eeh_get_log - Retrieve error log
136 * @severity: temporary or permanent error log
137 * @drv_log: driver log to be combined with retrieved error log
138 * @len: length of driver log
140 * Retrieve the temporary or permanent error from the PE.
141 * Actually, the error will be retrieved through the dedicated
144 static int pseries_eeh_get_log(struct device_node *dn, int severity, char *drv_log, unsigned long len)
150 * pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE
151 * @dn: PE associated device node
153 * The function will be called to reconfigure the bridges included
154 * in the specified PE so that the mulfunctional PE would be recovered
157 static int pseries_eeh_configure_bridge(struct device_node *dn)
162 static struct eeh_ops pseries_eeh_ops = {
164 .init = pseries_eeh_init,
165 .set_option = pseries_eeh_set_option,
166 .get_pe_addr = pseries_eeh_get_pe_addr,
167 .get_state = pseries_eeh_get_state,
168 .reset = pseries_eeh_reset,
169 .wait_state = pseries_eeh_wait_state,
170 .get_log = pseries_eeh_get_log,
171 .configure_bridge = pseries_eeh_configure_bridge
175 * eeh_pseries_init - Register platform dependent EEH operations
177 * EEH initialization on pseries platform. This function should be
178 * called before any EEH related functions.
180 int __init eeh_pseries_init(void)
182 return eeh_ops_register(&pseries_eeh_ops);