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s390/pci: implement hotplug notifications

Browse source 
When the availability of a pci function has changed by means
outside of our control we receive an availability event.
Implement/improve the handling of these notifications.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
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 2013-11-15 13:56:08 +01:00 committed by Martin Schwidefsky
parent 605c36986c
commit d795ddad36
1 changed files with 55 additions and 26 deletions
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81
arch/s390/pci/pci_event.c
View file

@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/pci.h>
#include <asm/pci_debug.h>
#include <asm/sclp.h>
/* Content Code Description for PCI Function Error */
struct zpci_ccdf_err {
@ -42,31 +43,6 @@ struct zpci_ccdf_avail {
u16 pec; /* PCI event code */
} __packed;
static void zpci_event_log_avail(struct zpci_ccdf_avail *ccdf)
{
struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
struct pci_dev *pdev = zdev ? zdev->pdev : NULL;
pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
zpci_err("avail CCDF:\n");
zpci_err_hex(ccdf, sizeof(*ccdf));
switch (ccdf->pec) {
case 0x0301:
zpci_enable_device(zdev);
break;
case 0x0302:
clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
break;
case 0x0306:
clp_rescan_pci_devices();
break;
default:
break;
}
}
void zpci_event_error(void *data)
{
struct zpci_ccdf_err *ccdf = data;
@ -84,5 +60,58 @@ void zpci_event_error(void *data)
void zpci_event_availability(void *data)
{
zpci_event_log_avail(data);
struct zpci_ccdf_avail *ccdf = data;
struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
struct pci_dev *pdev = zdev ? zdev->pdev : NULL;
int ret;
pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
zpci_err("avail CCDF:\n");
zpci_err_hex(ccdf, sizeof(*ccdf));
switch (ccdf->pec) {
case 0x0301: /* Standby -> Configured */
if (!zdev || zdev->state == ZPCI_FN_STATE_CONFIGURED)
break;
zdev->state = ZPCI_FN_STATE_CONFIGURED;
ret = zpci_enable_device(zdev);
if (ret)
break;
pci_rescan_bus(zdev->bus);
break;
case 0x0302: /* Reserved -> Standby */
clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
break;
case 0x0303: /* Deconfiguration requested */
if (pdev)
pci_stop_and_remove_bus_device(pdev);
ret = zpci_disable_device(zdev);
if (ret)
break;
ret = sclp_pci_deconfigure(zdev->fid);
zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
if (!ret)
zdev->state = ZPCI_FN_STATE_STANDBY;
break;
case 0x0304: /* Configured -> Standby */
if (pdev)
pci_stop_and_remove_bus_device(pdev);
zpci_disable_device(zdev);
zdev->state = ZPCI_FN_STATE_STANDBY;
break;
case 0x0306: /* 0x308 or 0x302 for multiple devices */
clp_rescan_pci_devices();
break;
case 0x0308: /* Standby -> Reserved */
pci_stop_root_bus(zdev->bus);
pci_remove_root_bus(zdev->bus);
break;
default:
break;
}
}