LXR linux/arch/s390/pci/pci

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  Copyright IBM Corp. 2012
   4 *
   5 *  Author(s):
   6 *    Jan Glauber <jang@linux.vnet.ibm.com>
   7 */
   8
   9#define KMSG_COMPONENT "zpci"
  10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12#include <linux/kernel.h>
  13#include <linux/pci.h>
  14#include <asm/pci_debug.h>
  15#include <asm/sclp.h>
  16
  17#include "pci_bus.h"
  18
  19/* Content Code Description for PCI Function Error */
  20struct zpci_ccdf_err {
  21        u32 reserved1;
  22        u32 fh;                         /* function handle */
  23        u32 fid;                        /* function id */
  24        u32 ett         :  4;           /* expected table type */
  25        u32 mvn         : 12;           /* MSI vector number */
  26        u32 dmaas       :  8;           /* DMA address space */
  27        u32             :  6;
  28        u32 q           :  1;           /* event qualifier */
  29        u32 rw          :  1;           /* read/write */
  30        u64 faddr;                      /* failing address */
  31        u32 reserved3;
  32        u16 reserved4;
  33        u16 pec;                        /* PCI event code */
  34} __packed;
  35
  36/* Content Code Description for PCI Function Availability */
  37struct zpci_ccdf_avail {
  38        u32 reserved1;
  39        u32 fh;                         /* function handle */
  40        u32 fid;                        /* function id */
  41        u32 reserved2;
  42        u32 reserved3;
  43        u32 reserved4;
  44        u32 reserved5;
  45        u16 reserved6;
  46        u16 pec;                        /* PCI event code */
  47} __packed;
  48
  49static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
  50{
  51        struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
  52        struct pci_dev *pdev = NULL;
  53
  54        zpci_err("error CCDF:\n");
  55        zpci_err_hex(ccdf, sizeof(*ccdf));
  56
  57        if (zdev)
  58                pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
  59
  60        pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
  61               pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
  62
  63        if (!pdev)
  64                return;
  65
  66        pdev->error_state = pci_channel_io_perm_failure;
  67        pci_dev_put(pdev);
  68}
  69
  70void zpci_event_error(void *data)
  71{
  72        if (zpci_is_enabled())
  73                __zpci_event_error(data);
  74}
  75
  76static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
  77{
  78        struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
  79        struct pci_dev *pdev = NULL;
  80        enum zpci_state state;
  81        int ret;
  82
  83        if (zdev && zdev->zbus && zdev->zbus->bus)
  84                pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
  85
  86        zpci_err("avail CCDF:\n");
  87        zpci_err_hex(ccdf, sizeof(*ccdf));
  88
  89        switch (ccdf->pec) {
  90        case 0x0301: /* Reserved|Standby -> Configured */
  91                if (!zdev) {
  92                        ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 1);
  93                        break;
  94                }
  95                zdev->fh = ccdf->fh;
  96                zdev->state = ZPCI_FN_STATE_CONFIGURED;
  97                ret = zpci_enable_device(zdev);
  98                if (ret)
  99                        break;
 100
 101                pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
 102                if (!pdev)
 103                        break;
 104
 105                pci_bus_add_device(pdev);
 106                pci_lock_rescan_remove();
 107                pci_bus_add_devices(zdev->zbus->bus);
 108                pci_unlock_rescan_remove();
 109                break;
 110        case 0x0302: /* Reserved -> Standby */
 111                if (!zdev) {
 112                        clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
 113                        break;
 114                }
 115                zdev->fh = ccdf->fh;
 116                break;
 117        case 0x0303: /* Deconfiguration requested */
 118                if (!zdev)
 119                        break;
 120                if (pdev)
 121                        pci_stop_and_remove_bus_device_locked(pdev);
 122
 123                ret = zpci_disable_device(zdev);
 124                if (ret)
 125                        break;
 126
 127                ret = sclp_pci_deconfigure(zdev->fid);
 128                zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
 129                if (!ret)
 130                        zdev->state = ZPCI_FN_STATE_STANDBY;
 131
 132                break;
 133        case 0x0304: /* Configured -> Standby|Reserved */
 134                if (!zdev)
 135                        break;
 136                if (pdev) {
 137                        /* Give the driver a hint that the function is
 138                         * already unusable. */
 139                        pdev->error_state = pci_channel_io_perm_failure;
 140                        pci_stop_and_remove_bus_device_locked(pdev);
 141                }
 142
 143                zdev->state = ZPCI_FN_STATE_STANDBY;
 144                if (!clp_get_state(ccdf->fid, &state) &&
 145                    state == ZPCI_FN_STATE_RESERVED) {
 146                        zpci_zdev_put(zdev);
 147                }
 148                break;
 149        case 0x0306: /* 0x308 or 0x302 for multiple devices */
 150                clp_rescan_pci_devices();
 151                break;
 152        case 0x0308: /* Standby -> Reserved */
 153                if (!zdev)
 154                        break;
 155                zpci_zdev_put(zdev);
 156                break;
 157        default:
 158                break;
 159        }
 160}
 161
 162void zpci_event_availability(void *data)
 163{
 164        if (zpci_is_enabled())
 165                __zpci_event_availability(data);
 166}
 167