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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2012
*
* Author(s):
* Jan Glauber <jang@linux.vnet.ibm.com>
*/
#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kernel.h>
#include <linux/pci.h>
#include <asm/pci_debug.h>
#include <asm/sclp.h>
#include "pci_bus.h"
/* Content Code Description for PCI Function Error */
struct zpci_ccdf_err {
u32 reserved1;
u32 fh; /* function handle */
u32 fid; /* function id */
u32 ett : 4; /* expected table type */
u32 mvn : 12; /* MSI vector number */
u32 dmaas : 8; /* DMA address space */
u32 : 6;
u32 q : 1; /* event qualifier */
u32 rw : 1; /* read/write */
u64 faddr; /* failing address */
u32 reserved3;
u16 reserved4;
u16 pec; /* PCI event code */
} __packed;
/* Content Code Description for PCI Function Availability */
struct zpci_ccdf_avail {
u32 reserved1;
u32 fh; /* function handle */
u32 fid; /* function id */
u32 reserved2;
u32 reserved3;
u32 reserved4;
u32 reserved5;
u16 reserved6;
u16 pec; /* PCI event code */
} __packed;
static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
{
struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
struct pci_dev *pdev = NULL;
zpci_err("error CCDF:\n");
zpci_err_hex(ccdf, sizeof(*ccdf));
if (zdev)
pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
if (!pdev)
return;
pdev->error_state = pci_channel_io_perm_failure;
pci_dev_put(pdev);
}
void zpci_event_error(void *data)
{
if (zpci_is_enabled())
__zpci_event_error(data);
}
static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
{
struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
enum zpci_state state;
struct pci_dev *pdev;
int ret;
zpci_err("avail CCDF:\n");
zpci_err_hex(ccdf, sizeof(*ccdf));
switch (ccdf->pec) {
case 0x0301: /* Reserved|Standby -> Configured */
if (!zdev) {
zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED);
break;
}
/* the configuration request may be stale */
if (zdev->state != ZPCI_FN_STATE_STANDBY)
break;
zdev->fh = ccdf->fh;
zdev->state = ZPCI_FN_STATE_CONFIGURED;
ret = zpci_enable_device(zdev);
if (ret)
break;
/* the PCI function will be scanned once function 0 appears */
if (!zdev->zbus->bus)
break;
pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
if (!pdev)
break;
pci_bus_add_device(pdev);
pci_lock_rescan_remove();
pci_bus_add_devices(zdev->zbus->bus);
pci_unlock_rescan_remove();
break;
case 0x0302: /* Reserved -> Standby */
if (!zdev) {
zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY);
break;
}
zdev->fh = ccdf->fh;
break;
case 0x0303: /* Deconfiguration requested */
if (!zdev)
break;
zpci_remove_device(zdev, false);
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|Reserved */
if (!zdev)
break;
/* Give the driver a hint that the function is
* already unusable.
*/
zpci_remove_device(zdev, true);
zdev->fh = ccdf->fh;
zpci_disable_device(zdev);
zdev->state = ZPCI_FN_STATE_STANDBY;
if (!clp_get_state(ccdf->fid, &state) &&
state == ZPCI_FN_STATE_RESERVED) {
zpci_zdev_put(zdev);
}
break;
case 0x0306: /* 0x308 or 0x302 for multiple devices */
zpci_remove_reserved_devices();
clp_scan_pci_devices();
break;
case 0x0308: /* Standby -> Reserved */
if (!zdev)
break;
zpci_zdev_put(zdev);
break;
default:
break;
}
}
void zpci_event_availability(void *data)
{
if (zpci_is_enabled())
__zpci_event_availability(data);
}
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