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s390/pci: CHSC PCI support for error and availability events
Add CHSC store-event-information support for PCI (notfication type 2) and report error and availability events to the PCI architecture layer. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber
Martin Schwidefsky
parent
828b35f60e
commit
cbc0dd1f85
@ -127,6 +127,10 @@ void zpci_teardown_msi_irq(struct zpci_dev *, struct msi_desc *);
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int zpci_msihash_init(void);
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void zpci_msihash_exit(void);
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/* Error handling and recovery */
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void zpci_event_error(void *);
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void zpci_event_availability(void *);
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/* Helpers */
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struct zpci_dev *get_zdev(struct pci_dev *);
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struct zpci_dev *get_zdev_by_fid(u32);
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@ -2,4 +2,5 @@
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# Makefile for the s390 PCI subsystem.
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#
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obj-$(CONFIG_PCI) += pci.o pci_dma.o pci_clp.o pci_msi.o
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obj-$(CONFIG_PCI) += pci.o pci_dma.o pci_clp.o pci_msi.o \
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pci_event.o
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93
arch/s390/pci/pci_event.c
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93
arch/s390/pci/pci_event.c
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@ -0,0 +1,93 @@
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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 COMPONENT "zPCI"
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#define pr_fmt(fmt) COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/pci.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_log_err(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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dev_err(&zdev->pdev->dev, "event code: 0x%x\n", ccdf->pec);
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}
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static void zpci_event_log_avail(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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pr_err("%s%s: availability event: fh: 0x%x fid: 0x%x event code: 0x%x reason:",
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(zdev) ? dev_driver_string(&zdev->pdev->dev) : "?",
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(zdev) ? dev_name(&zdev->pdev->dev) : "?",
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ccdf->fh, ccdf->fid, ccdf->pec);
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print_hex_dump(KERN_CONT, "ccdf", DUMP_PREFIX_OFFSET,
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16, 1, ccdf, sizeof(*ccdf), false);
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switch (ccdf->pec) {
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case 0x0301:
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zpci_enable_device(zdev);
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break;
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case 0x0302:
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clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
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break;
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case 0x0306:
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clp_find_pci_devices();
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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_error(void *data)
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{
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struct zpci_ccdf_err *ccdf = data;
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struct zpci_dev *zdev;
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zpci_event_log_err(ccdf);
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zdev = get_zdev_by_fid(ccdf->fid);
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if (!zdev) {
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pr_err("Error event for unknown fid: %x", ccdf->fid);
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return;
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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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zpci_event_log_avail(data);
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}
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@ -1,7 +1,7 @@
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/*
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* S/390 common I/O routines -- channel subsystem call
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*
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* Copyright IBM Corp. 1999, 2010
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* Copyright IBM Corp. 1999,2012
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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* Arnd Bergmann (arndb@de.ibm.com)
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@ -14,6 +14,7 @@
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <asm/cio.h>
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#include <asm/chpid.h>
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@ -260,26 +261,45 @@ __get_chpid_from_lir(void *data)
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return (u16) (lir->indesc[0]&0x000000ff);
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}
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struct chsc_sei_area {
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struct chsc_header request;
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struct chsc_sei_nt0_area {
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u8 flags;
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u8 vf; /* validity flags */
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u8 rs; /* reporting source */
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u8 cc; /* content code */
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u16 fla; /* full link address */
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u16 rsid; /* reporting source id */
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u32 reserved1;
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u32 reserved2;
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u32 reserved3;
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struct chsc_header response;
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u32 reserved4;
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u8 flags;
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u8 vf; /* validity flags */
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u8 rs; /* reporting source */
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u8 cc; /* content code */
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u16 fla; /* full link address */
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u16 rsid; /* reporting source id */
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u32 reserved5;
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u32 reserved6;
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u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */
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/* ccdf has to be big enough for a link-incident record */
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} __attribute__ ((packed));
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u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
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} __packed;
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static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
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struct chsc_sei_nt2_area {
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u8 flags; /* p and v bit */
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u8 reserved1;
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u8 reserved2;
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u8 cc; /* content code */
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u32 reserved3[13];
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u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
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} __packed;
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#define CHSC_SEI_NT0 0ULL
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#define CHSC_SEI_NT2 (1ULL << 61)
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struct chsc_sei {
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struct chsc_header request;
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u32 reserved1;
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u64 ntsm; /* notification type mask */
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struct chsc_header response;
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u32 reserved2;
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union {
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struct chsc_sei_nt0_area nt0_area;
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struct chsc_sei_nt2_area nt2_area;
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u8 nt_area[PAGE_SIZE - 24];
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} u;
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} __packed;
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static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
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{
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struct chp_id chpid;
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int id;
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@ -298,7 +318,7 @@ static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
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}
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}
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static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
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static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
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{
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struct chp_link link;
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struct chp_id chpid;
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@ -330,7 +350,7 @@ static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
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s390_process_res_acc(&link);
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}
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static void chsc_process_sei_chp_avail(struct chsc_sei_area *sei_area)
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static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
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{
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struct channel_path *chp;
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struct chp_id chpid;
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@ -366,7 +386,7 @@ struct chp_config_data {
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u8 pc;
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};
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static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
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static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
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{
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struct chp_config_data *data;
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struct chp_id chpid;
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@ -398,7 +418,7 @@ static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
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}
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}
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static void chsc_process_sei_scm_change(struct chsc_sei_area *sei_area)
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static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
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{
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int ret;
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@ -412,13 +432,26 @@ static void chsc_process_sei_scm_change(struct chsc_sei_area *sei_area)
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" failed (rc=%d).\n", ret);
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}
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static void chsc_process_sei(struct chsc_sei_area *sei_area)
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static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
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{
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/* Check if we might have lost some information. */
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if (sei_area->flags & 0x40) {
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CIO_CRW_EVENT(2, "chsc: event overflow\n");
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css_schedule_eval_all();
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#ifdef CONFIG_PCI
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switch (sei_area->cc) {
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case 1:
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zpci_event_error(sei_area->ccdf);
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break;
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case 2:
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zpci_event_availability(sei_area->ccdf);
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break;
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default:
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CIO_CRW_EVENT(2, "chsc: unhandled sei content code %d\n",
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sei_area->cc);
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break;
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}
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#endif
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}
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static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
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{
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/* which kind of information was stored? */
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switch (sei_area->cc) {
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case 1: /* link incident*/
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@ -443,9 +476,51 @@ static void chsc_process_sei(struct chsc_sei_area *sei_area)
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}
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}
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static int __chsc_process_crw(struct chsc_sei *sei, u64 ntsm)
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{
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do {
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memset(sei, 0, sizeof(*sei));
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sei->request.length = 0x0010;
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sei->request.code = 0x000e;
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sei->ntsm = ntsm;
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if (chsc(sei))
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break;
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if (sei->response.code == 0x0001) {
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CIO_CRW_EVENT(2, "chsc: sei successful\n");
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/* Check if we might have lost some information. */
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if (sei->u.nt0_area.flags & 0x40) {
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CIO_CRW_EVENT(2, "chsc: event overflow\n");
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css_schedule_eval_all();
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}
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switch (sei->ntsm) {
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case CHSC_SEI_NT0:
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chsc_process_sei_nt0(&sei->u.nt0_area);
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return 1;
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case CHSC_SEI_NT2:
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chsc_process_sei_nt2(&sei->u.nt2_area);
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return 1;
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default:
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CIO_CRW_EVENT(2, "chsc: unhandled nt (nt=%08Lx)\n",
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sei->ntsm);
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return 0;
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}
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} else {
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CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
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sei->response.code);
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break;
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}
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} while (sei->u.nt0_area.flags & 0x80);
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return 0;
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}
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static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
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{
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struct chsc_sei_area *sei_area;
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struct chsc_sei *sei;
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if (overflow) {
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css_schedule_eval_all();
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@ -459,25 +534,18 @@ static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
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return;
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/* Access to sei_page is serialized through machine check handler
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* thread, so no need for locking. */
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sei_area = sei_page;
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sei = sei_page;
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CIO_TRACE_EVENT(2, "prcss");
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do {
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memset(sei_area, 0, sizeof(*sei_area));
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sei_area->request.length = 0x0010;
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sei_area->request.code = 0x000e;
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if (chsc(sei_area))
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break;
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if (sei_area->response.code == 0x0001) {
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CIO_CRW_EVENT(4, "chsc: sei successful\n");
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chsc_process_sei(sei_area);
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} else {
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CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
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sei_area->response.code);
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break;
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}
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} while (sei_area->flags & 0x80);
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/*
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* The ntsm does not allow to select NT0 and NT2 together. We need to
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* first check for NT2, than additionally for NT0...
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*/
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#ifdef CONFIG_PCI
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if (!__chsc_process_crw(sei, CHSC_SEI_NT2))
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#endif
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__chsc_process_crw(sei, CHSC_SEI_NT0);
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}
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void chsc_chp_online(struct chp_id chpid)
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