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s390/pci: update function handle after resume from hibernate 

Function handles may change while the system was in hibernation
use list pci functions and update the function handles.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2013-08-29 19:40:01 +02:00 committed by Martin Schwidefsky
parent d03abe5882
commit 57b5918c33
4 changed files with 45 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/s390/include/asm/pci.h
View File

@ -6,6 +6,7 @@
/* must be set before including pci_clp.h */
#define PCI_BAR_COUNT 6
#include <linux/pci.h>
#include <asm-generic/pci.h>
#include <asm-generic/pci-dma-compat.h>
#include <asm/pci_clp.h>
@ -137,6 +138,7 @@ int zpci_unregister_ioat(struct zpci_dev *, u8);
/* CLP */
int clp_scan_pci_devices(void);
int clp_rescan_pci_devices(void);
int clp_rescan_pci_devices_simple(void);
int clp_add_pci_device(u32, u32, int);
int clp_enable_fh(struct zpci_dev *, u8);
int clp_disable_fh(struct zpci_dev *);
@ -145,9 +147,11 @@ int clp_disable_fh(struct zpci_dev *);
/* Error handling and recovery */
void zpci_event_error(void *);
void zpci_event_availability(void *);
void zpci_rescan(void);
#else /* CONFIG_PCI */
static inline void zpci_event_error(void *e) {}
static inline void zpci_event_availability(void *e) {}
static inline void zpci_rescan(void) {}
#endif /* CONFIG_PCI */
#ifdef CONFIG_HOTPLUG_PCI_S390

2
arch/s390/kernel/suspend.c
View File

@ -12,6 +12,7 @@
#include <asm/ctl_reg.h>
#include <asm/ipl.h>
#include <asm/cio.h>
#include <asm/pci.h>
/*
* References to section boundaries
@ -219,4 +220,5 @@ void s390_early_resume(void)
{
lgr_info_log();
channel_subsystem_reinit();
zpci_rescan();
}

15
arch/s390/pci/pci.c
View File

@ -46,7 +46,7 @@
/* list of all detected zpci devices */
static LIST_HEAD(zpci_list);
static DEFINE_MUTEX(zpci_list_lock);
static DEFINE_SPINLOCK(zpci_list_lock);
static void zpci_enable_irq(struct irq_data *data);
static void zpci_disable_irq(struct irq_data *data);
@ -88,14 +88,14 @@ struct zpci_dev *get_zdev_by_fid(u32 fid)
{
struct zpci_dev *tmp, *zdev = NULL;
mutex_lock(&zpci_list_lock);
spin_lock(&zpci_list_lock);
list_for_each_entry(tmp, &zpci_list, entry) {
if (tmp->fid == fid) {
zdev = tmp;
break;
}
}
mutex_unlock(&zpci_list_lock);
spin_unlock(&zpci_list_lock);
return zdev;
}
@ -821,9 +821,9 @@ int zpci_create_device(struct zpci_dev *zdev)
if (rc)
goto out_disable;
mutex_lock(&zpci_list_lock);
spin_lock(&zpci_list_lock);
list_add_tail(&zdev->entry, &zpci_list);
mutex_unlock(&zpci_list_lock);
spin_unlock(&zpci_list_lock);
zpci_init_slot(zdev);
@ -939,3 +939,8 @@ out:
return rc;
}
subsys_initcall_sync(pci_base_init);
void zpci_rescan(void)
{
clp_rescan_pci_devices_simple();
}

29
arch/s390/pci/pci_clp.c
View File

@ -319,6 +319,20 @@ static void __clp_rescan(struct clp_fh_list_entry *entry)
}
}
static void __clp_update(struct clp_fh_list_entry *entry)
{
struct zpci_dev *zdev;
if (!entry->vendor_id)
return;
zdev = get_zdev_by_fid(entry->fid);
if (!zdev)
return;
zdev->fh = entry->fh;
}
int clp_scan_pci_devices(void)
{
struct clp_req_rsp_list_pci *rrb;
@ -348,3 +362,18 @@ int clp_rescan_pci_devices(void)
clp_free_block(rrb);
return rc;
}
int clp_rescan_pci_devices_simple(void)
{
struct clp_req_rsp_list_pci *rrb;
int rc;
rrb = clp_alloc_block(GFP_NOWAIT);
if (!rrb)
return -ENOMEM;
rc = clp_list_pci(rrb, __clp_update);
clp_free_block(rrb);
return rc;
}