forked from Minki/linux
8fb8f70902
There're 4 EEH operations that are covered by the dedicated RTAS call <ibm,set-eeh-option>: enable or disable EEH, enable MMIO and enable DMA. At early stage of system boot, the EEH would be tried to enable on PCI device related device node. MMIO and DMA for particular PE should be enabled when doing recovery on EEH errors so that the PE could function properly again. The patch implements it and abstract that through struct eeh_ops::set_eeh. It would be help for EEH to support multiple platforms in future. Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
276 lines
8.3 KiB
C
276 lines
8.3 KiB
C
/*
|
|
* The file intends to implement the platform dependent EEH operations on pseries.
|
|
* Actually, the pseries platform is built based on RTAS heavily. That means the
|
|
* pseries platform dependent EEH operations will be built on RTAS calls. The functions
|
|
* are devired from arch/powerpc/platforms/pseries/eeh.c and necessary cleanup has
|
|
* been done.
|
|
*
|
|
* Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2011.
|
|
* Copyright IBM Corporation 2001, 2005, 2006
|
|
* Copyright Dave Engebretsen & Todd Inglett 2001
|
|
* Copyright Linas Vepstas 2005, 2006
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/export.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/of.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <asm/eeh.h>
|
|
#include <asm/eeh_event.h>
|
|
#include <asm/io.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/ppc-pci.h>
|
|
#include <asm/rtas.h>
|
|
|
|
/* RTAS tokens */
|
|
static int ibm_set_eeh_option;
|
|
static int ibm_set_slot_reset;
|
|
static int ibm_read_slot_reset_state;
|
|
static int ibm_read_slot_reset_state2;
|
|
static int ibm_slot_error_detail;
|
|
static int ibm_get_config_addr_info;
|
|
static int ibm_get_config_addr_info2;
|
|
static int ibm_configure_bridge;
|
|
static int ibm_configure_pe;
|
|
|
|
/**
|
|
* pseries_eeh_init - EEH platform dependent initialization
|
|
*
|
|
* EEH platform dependent initialization on pseries.
|
|
*/
|
|
static int pseries_eeh_init(void)
|
|
{
|
|
/* figure out EEH RTAS function call tokens */
|
|
ibm_set_eeh_option = rtas_token("ibm,set-eeh-option");
|
|
ibm_set_slot_reset = rtas_token("ibm,set-slot-reset");
|
|
ibm_read_slot_reset_state2 = rtas_token("ibm,read-slot-reset-state2");
|
|
ibm_read_slot_reset_state = rtas_token("ibm,read-slot-reset-state");
|
|
ibm_slot_error_detail = rtas_token("ibm,slot-error-detail");
|
|
ibm_get_config_addr_info2 = rtas_token("ibm,get-config-addr-info2");
|
|
ibm_get_config_addr_info = rtas_token("ibm,get-config-addr-info");
|
|
ibm_configure_pe = rtas_token("ibm,configure-pe");
|
|
ibm_configure_bridge = rtas_token ("ibm,configure-bridge");
|
|
|
|
/* necessary sanity check */
|
|
if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE) {
|
|
pr_warning("%s: RTAS service <ibm,set-eeh-option> invalid\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
} else if (ibm_set_slot_reset == RTAS_UNKNOWN_SERVICE) {
|
|
pr_warning("%s: RTAS service <ibm, set-slot-reset> invalid\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
} else if (ibm_read_slot_reset_state2 == RTAS_UNKNOWN_SERVICE &&
|
|
ibm_read_slot_reset_state == RTAS_UNKNOWN_SERVICE) {
|
|
pr_warning("%s: RTAS service <ibm,read-slot-reset-state2> and "
|
|
"<ibm,read-slot-reset-state> invalid\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
} else if (ibm_slot_error_detail == RTAS_UNKNOWN_SERVICE) {
|
|
pr_warning("%s: RTAS service <ibm,slot-error-detail> invalid\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
} else if (ibm_get_config_addr_info2 == RTAS_UNKNOWN_SERVICE &&
|
|
ibm_get_config_addr_info == RTAS_UNKNOWN_SERVICE) {
|
|
pr_warning("%s: RTAS service <ibm,get-config-addr-info2> and "
|
|
"<ibm,get-config-addr-info> invalid\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
} else if (ibm_configure_pe == RTAS_UNKNOWN_SERVICE &&
|
|
ibm_configure_bridge == RTAS_UNKNOWN_SERVICE) {
|
|
pr_warning("%s: RTAS service <ibm,configure-pe> and "
|
|
"<ibm,configure-bridge> invalid\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable
|
|
* @dn: device node
|
|
* @option: operation to be issued
|
|
*
|
|
* The function is used to control the EEH functionality globally.
|
|
* Currently, following options are support according to PAPR:
|
|
* Enable EEH, Disable EEH, Enable MMIO and Enable DMA
|
|
*/
|
|
static int pseries_eeh_set_option(struct device_node *dn, int option)
|
|
{
|
|
int ret = 0;
|
|
struct pci_dn *pdn;
|
|
const u32 *reg;
|
|
int config_addr;
|
|
|
|
pdn = PCI_DN(dn);
|
|
|
|
/*
|
|
* When we're enabling or disabling EEH functioality on
|
|
* the particular PE, the PE config address is possibly
|
|
* unavailable. Therefore, we have to figure it out from
|
|
* the FDT node.
|
|
*/
|
|
switch (option) {
|
|
case EEH_OPT_DISABLE:
|
|
case EEH_OPT_ENABLE:
|
|
reg = of_get_property(dn, "reg", NULL);
|
|
config_addr = reg[0];
|
|
break;
|
|
|
|
case EEH_OPT_THAW_MMIO:
|
|
case EEH_OPT_THAW_DMA:
|
|
config_addr = pdn->eeh_config_addr;
|
|
if (pdn->eeh_pe_config_addr)
|
|
config_addr = pdn->eeh_pe_config_addr;
|
|
break;
|
|
|
|
default:
|
|
pr_err("%s: Invalid option %d\n",
|
|
__func__, option);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL,
|
|
config_addr, BUID_HI(pdn->phb->buid),
|
|
BUID_LO(pdn->phb->buid), option);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pseries_eeh_get_pe_addr - Retrieve PE address
|
|
* @dn: device node
|
|
*
|
|
* Retrieve the assocated PE address. Actually, there're 2 RTAS
|
|
* function calls dedicated for the purpose. We need implement
|
|
* it through the new function and then the old one. Besides,
|
|
* you should make sure the config address is figured out from
|
|
* FDT node before calling the function.
|
|
*
|
|
* It's notable that zero'ed return value means invalid PE config
|
|
* address.
|
|
*/
|
|
static int pseries_eeh_get_pe_addr(struct device_node *dn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pseries_eeh_get_state - Retrieve PE state
|
|
* @dn: PE associated device node
|
|
* @state: return value
|
|
*
|
|
* Retrieve the state of the specified PE. On RTAS compliant
|
|
* pseries platform, there already has one dedicated RTAS function
|
|
* for the purpose. It's notable that the associated PE config address
|
|
* might be ready when calling the function. Therefore, endeavour to
|
|
* use the PE config address if possible. Further more, there're 2
|
|
* RTAS calls for the purpose, we need to try the new one and back
|
|
* to the old one if the new one couldn't work properly.
|
|
*/
|
|
static int pseries_eeh_get_state(struct device_node *dn, int *state)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pseries_eeh_reset - Reset the specified PE
|
|
* @dn: PE associated device node
|
|
* @option: reset option
|
|
*
|
|
* Reset the specified PE
|
|
*/
|
|
static int pseries_eeh_reset(struct device_node *dn, int option)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pseries_eeh_wait_state - Wait for PE state
|
|
* @dn: PE associated device node
|
|
* @max_wait: maximal period in microsecond
|
|
*
|
|
* Wait for the state of associated PE. It might take some time
|
|
* to retrieve the PE's state.
|
|
*/
|
|
static int pseries_eeh_wait_state(struct device_node *dn, int max_wait)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pseries_eeh_get_log - Retrieve error log
|
|
* @dn: device node
|
|
* @severity: temporary or permanent error log
|
|
* @drv_log: driver log to be combined with retrieved error log
|
|
* @len: length of driver log
|
|
*
|
|
* Retrieve the temporary or permanent error from the PE.
|
|
* Actually, the error will be retrieved through the dedicated
|
|
* RTAS call.
|
|
*/
|
|
static int pseries_eeh_get_log(struct device_node *dn, int severity, char *drv_log, unsigned long len)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE
|
|
* @dn: PE associated device node
|
|
*
|
|
* The function will be called to reconfigure the bridges included
|
|
* in the specified PE so that the mulfunctional PE would be recovered
|
|
* again.
|
|
*/
|
|
static int pseries_eeh_configure_bridge(struct device_node *dn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct eeh_ops pseries_eeh_ops = {
|
|
.name = "pseries",
|
|
.init = pseries_eeh_init,
|
|
.set_option = pseries_eeh_set_option,
|
|
.get_pe_addr = pseries_eeh_get_pe_addr,
|
|
.get_state = pseries_eeh_get_state,
|
|
.reset = pseries_eeh_reset,
|
|
.wait_state = pseries_eeh_wait_state,
|
|
.get_log = pseries_eeh_get_log,
|
|
.configure_bridge = pseries_eeh_configure_bridge
|
|
};
|
|
|
|
/**
|
|
* eeh_pseries_init - Register platform dependent EEH operations
|
|
*
|
|
* EEH initialization on pseries platform. This function should be
|
|
* called before any EEH related functions.
|
|
*/
|
|
int __init eeh_pseries_init(void)
|
|
{
|
|
return eeh_ops_register(&pseries_eeh_ops);
|
|
}
|