forked from Minki/linux
2631f6b6f2
A zPCI event with PEC 0x0301 for an existing zPCI device goes through the same actions as enable_slot(). Similarly a zPCI event with PEC 0x0303 does the same steps as disable_slot(). We can thus unify both actions as zpci_configure_device() respectively zpci_deconfigure_device(). Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2012
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*
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* Author(s):
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* Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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#define KMSG_COMPONENT "zpci"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <asm/pci_debug.h>
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#include <asm/sclp.h>
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#include "pci_bus.h"
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/* Content Code Description for PCI Function Error */
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struct zpci_ccdf_err {
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u32 reserved1;
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u32 fh; /* function handle */
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u32 fid; /* function id */
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u32 ett : 4; /* expected table type */
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u32 mvn : 12; /* MSI vector number */
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u32 dmaas : 8; /* DMA address space */
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u32 : 6;
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u32 q : 1; /* event qualifier */
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u32 rw : 1; /* read/write */
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u64 faddr; /* failing address */
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u32 reserved3;
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u16 reserved4;
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u16 pec; /* PCI event code */
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} __packed;
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/* Content Code Description for PCI Function Availability */
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struct zpci_ccdf_avail {
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u32 reserved1;
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u32 fh; /* function handle */
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u32 fid; /* function id */
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u32 reserved2;
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u32 reserved3;
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u32 reserved4;
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u32 reserved5;
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u16 reserved6;
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u16 pec; /* PCI event code */
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} __packed;
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static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
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{
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struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
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struct pci_dev *pdev = NULL;
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zpci_err("error CCDF:\n");
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zpci_err_hex(ccdf, sizeof(*ccdf));
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if (zdev)
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pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
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pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
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pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
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if (!pdev)
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return;
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pdev->error_state = pci_channel_io_perm_failure;
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pci_dev_put(pdev);
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}
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void zpci_event_error(void *data)
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{
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if (zpci_is_enabled())
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__zpci_event_error(data);
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}
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static void zpci_event_hard_deconfigured(struct zpci_dev *zdev, u32 fh)
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{
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enum zpci_state state;
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int rc;
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zdev->fh = fh;
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/* Give the driver a hint that the function is
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* already unusable.
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*/
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zpci_remove_device(zdev, true);
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if (zdev_enabled(zdev)) {
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rc = zpci_disable_device(zdev);
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if (rc)
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return;
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}
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zdev->state = ZPCI_FN_STATE_STANDBY;
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if (!clp_get_state(zdev->fid, &state) &&
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state == ZPCI_FN_STATE_RESERVED) {
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zpci_zdev_put(zdev);
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}
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}
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static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
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{
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struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
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zpci_err("avail CCDF:\n");
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zpci_err_hex(ccdf, sizeof(*ccdf));
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switch (ccdf->pec) {
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case 0x0301: /* Reserved|Standby -> Configured */
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if (!zdev) {
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zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED);
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break;
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}
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/* the configuration request may be stale */
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if (zdev->state != ZPCI_FN_STATE_STANDBY)
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break;
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zdev->state = ZPCI_FN_STATE_CONFIGURED;
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zpci_configure_device(zdev, ccdf->fh);
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break;
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case 0x0302: /* Reserved -> Standby */
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if (!zdev)
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zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY);
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else
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zdev->fh = ccdf->fh;
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break;
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case 0x0303: /* Deconfiguration requested */
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if (zdev) {
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zdev->fh = ccdf->fh;
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zpci_deconfigure_device(zdev);
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}
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break;
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case 0x0304: /* Configured -> Standby|Reserved */
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if (zdev)
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zpci_event_hard_deconfigured(zdev, ccdf->fh);
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break;
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case 0x0306: /* 0x308 or 0x302 for multiple devices */
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zpci_remove_reserved_devices();
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clp_scan_pci_devices();
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break;
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case 0x0308: /* Standby -> Reserved */
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if (!zdev)
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break;
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zpci_zdev_put(zdev);
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break;
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default:
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break;
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}
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}
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void zpci_event_availability(void *data)
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{
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if (zpci_is_enabled())
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__zpci_event_availability(data);
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}
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