Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932897Ab2KNJob (ORCPT ); Wed, 14 Nov 2012 04:44:31 -0500 Received: from e06smtp17.uk.ibm.com ([195.75.94.113]:59961 "EHLO e06smtp17.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932833Ab2KNJmc (ORCPT ); Wed, 14 Nov 2012 04:42:32 -0500 From: Jan Glauber To: linux-pci@vger.kernel.org Cc: linux-kernel@vger.kernel.org, heiko.carstens@de.ibm.com, schwidefsky@de.ibm.com, Jan Glauber Subject: [RFC PATCH 06/10] s390/pci: CHSC PCI support for error and availability events Date: Wed, 14 Nov 2012 10:41:38 +0100 Message-Id: <4d72dd60418fe8dc886049e64dfc180ec918e628.1352719878.git.jang@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.12.4 In-Reply-To: References: In-Reply-To: References: x-cbid: 12111409-0542-0000-0000-0000039280AE Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10729 Lines: 385 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 --- arch/s390/include/asm/pci.h | 4 ++ arch/s390/pci/Makefile | 3 +- arch/s390/pci/pci_event.c | 93 ++++++++++++++++++++++++++ drivers/s390/cio/chsc.c | 156 +++++++++++++++++++++++++++++++------------- 4 files changed, 211 insertions(+), 45 deletions(-) create mode 100644 arch/s390/pci/pci_event.c diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index ca48caf..3dc2cb6 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -127,6 +127,10 @@ void zpci_teardown_msi_irq(struct zpci_dev *, struct msi_desc *); int zpci_msihash_init(void); void zpci_msihash_exit(void); +/* Error handling and recovery */ +void zpci_event_error(void *); +void zpci_event_availability(void *); + /* Helpers */ struct zpci_dev *get_zdev(struct pci_dev *); struct zpci_dev *get_zdev_by_fid(u32); diff --git a/arch/s390/pci/Makefile b/arch/s390/pci/Makefile index 4590596..7e36f42 100644 --- a/arch/s390/pci/Makefile +++ b/arch/s390/pci/Makefile @@ -2,4 +2,5 @@ # Makefile for the s390 PCI subsystem. # -obj-$(CONFIG_PCI) += pci.o pci_dma.o pci_clp.o pci_msi.o +obj-$(CONFIG_PCI) += pci.o pci_dma.o pci_clp.o pci_msi.o \ + pci_event.o diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c new file mode 100644 index 0000000..dbed8cd --- /dev/null +++ b/arch/s390/pci/pci_event.c @@ -0,0 +1,93 @@ +/* + * Copyright IBM Corp. 2012 + * + * Author(s): + * Jan Glauber + */ + +#define COMPONENT "zPCI" +#define pr_fmt(fmt) COMPONENT ": " fmt + +#include +#include + +/* 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_log_err(struct zpci_ccdf_err *ccdf) +{ + struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); + + dev_err(&zdev->pdev->dev, "event code: 0x%x\n", ccdf->pec); +} + +static void zpci_event_log_avail(struct zpci_ccdf_avail *ccdf) +{ + struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); + + pr_err("%s%s: availability event: fh: 0x%x fid: 0x%x event code: 0x%x reason:", + (zdev) ? dev_driver_string(&zdev->pdev->dev) : "?", + (zdev) ? dev_name(&zdev->pdev->dev) : "?", + ccdf->fh, ccdf->fid, ccdf->pec); + print_hex_dump(KERN_CONT, "ccdf", DUMP_PREFIX_OFFSET, + 16, 1, ccdf, sizeof(*ccdf), false); + + 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_find_pci_devices(); + break; + default: + break; + } +} + +void zpci_event_error(void *data) +{ + struct zpci_ccdf_err *ccdf = data; + struct zpci_dev *zdev; + + zpci_event_log_err(ccdf); + zdev = get_zdev_by_fid(ccdf->fid); + if (!zdev) { + pr_err("Error event for unknown fid: %x", ccdf->fid); + return; + } +} + +void zpci_event_availability(void *data) +{ + zpci_event_log_avail(data); +} diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index 4d51a7c..68e80e2 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -1,7 +1,7 @@ /* * S/390 common I/O routines -- channel subsystem call * - * Copyright IBM Corp. 1999, 2010 + * Copyright IBM Corp. 1999,2012 * Author(s): Ingo Adlung (adlung@de.ibm.com) * Cornelia Huck (cornelia.huck@de.ibm.com) * Arnd Bergmann (arndb@de.ibm.com) @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -260,26 +261,45 @@ __get_chpid_from_lir(void *data) return (u16) (lir->indesc[0]&0x000000ff); } -struct chsc_sei_area { - struct chsc_header request; +struct chsc_sei_nt0_area { + u8 flags; + u8 vf; /* validity flags */ + u8 rs; /* reporting source */ + u8 cc; /* content code */ + u16 fla; /* full link address */ + u16 rsid; /* reporting source id */ u32 reserved1; u32 reserved2; - u32 reserved3; - struct chsc_header response; - u32 reserved4; - u8 flags; - u8 vf; /* validity flags */ - u8 rs; /* reporting source */ - u8 cc; /* content code */ - u16 fla; /* full link address */ - u16 rsid; /* reporting source id */ - u32 reserved5; - u32 reserved6; - u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */ /* ccdf has to be big enough for a link-incident record */ -} __attribute__ ((packed)); - -static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area) + u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */ +} __packed; + +struct chsc_sei_nt2_area { + u8 flags; /* p and v bit */ + u8 reserved1; + u8 reserved2; + u8 cc; /* content code */ + u32 reserved3[13]; + u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */ +} __packed; + +#define CHSC_SEI_NT0 0ULL +#define CHSC_SEI_NT2 (1ULL << 61) + +struct chsc_sei { + struct chsc_header request; + u32 reserved1; + u64 ntsm; /* notification type mask */ + struct chsc_header response; + u32 reserved2; + union { + struct chsc_sei_nt0_area nt0_area; + struct chsc_sei_nt2_area nt2_area; + u8 nt_area[PAGE_SIZE - 24]; + } u; +} __packed; + +static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area) { struct chp_id chpid; int id; @@ -298,7 +318,7 @@ static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area) } } -static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area) +static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area) { struct chp_link link; struct chp_id chpid; @@ -330,7 +350,7 @@ static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area) s390_process_res_acc(&link); } -static void chsc_process_sei_chp_avail(struct chsc_sei_area *sei_area) +static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area) { struct channel_path *chp; struct chp_id chpid; @@ -366,7 +386,7 @@ struct chp_config_data { u8 pc; }; -static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area) +static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area) { struct chp_config_data *data; struct chp_id chpid; @@ -398,7 +418,7 @@ static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area) } } -static void chsc_process_sei_scm_change(struct chsc_sei_area *sei_area) +static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area) { int ret; @@ -412,13 +432,26 @@ static void chsc_process_sei_scm_change(struct chsc_sei_area *sei_area) " failed (rc=%d).\n", ret); } -static void chsc_process_sei(struct chsc_sei_area *sei_area) +static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area) { - /* Check if we might have lost some information. */ - if (sei_area->flags & 0x40) { - CIO_CRW_EVENT(2, "chsc: event overflow\n"); - css_schedule_eval_all(); +#ifdef CONFIG_PCI + switch (sei_area->cc) { + case 1: + zpci_event_error(sei_area->ccdf); + break; + case 2: + zpci_event_availability(sei_area->ccdf); + break; + default: + CIO_CRW_EVENT(2, "chsc: unhandled sei content code %d\n", + sei_area->cc); + break; } +#endif +} + +static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area) +{ /* which kind of information was stored? */ switch (sei_area->cc) { case 1: /* link incident*/ @@ -443,9 +476,51 @@ static void chsc_process_sei(struct chsc_sei_area *sei_area) } } +static int __chsc_process_crw(struct chsc_sei *sei, u64 ntsm) +{ + do { + memset(sei, 0, sizeof(*sei)); + sei->request.length = 0x0010; + sei->request.code = 0x000e; + sei->ntsm = ntsm; + + if (chsc(sei)) + break; + + if (sei->response.code == 0x0001) { + CIO_CRW_EVENT(2, "chsc: sei successful\n"); + + /* Check if we might have lost some information. */ + if (sei->u.nt0_area.flags & 0x40) { + CIO_CRW_EVENT(2, "chsc: event overflow\n"); + css_schedule_eval_all(); + } + + switch (sei->ntsm) { + case CHSC_SEI_NT0: + chsc_process_sei_nt0(&sei->u.nt0_area); + return 1; + case CHSC_SEI_NT2: + chsc_process_sei_nt2(&sei->u.nt2_area); + return 1; + default: + CIO_CRW_EVENT(2, "chsc: unhandled nt (nt=%08Lx)\n", + sei->ntsm); + return 0; + } + } else { + CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n", + sei->response.code); + break; + } + } while (sei->u.nt0_area.flags & 0x80); + + return 0; +} + static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow) { - struct chsc_sei_area *sei_area; + struct chsc_sei *sei; if (overflow) { css_schedule_eval_all(); @@ -459,25 +534,18 @@ static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow) return; /* Access to sei_page is serialized through machine check handler * thread, so no need for locking. */ - sei_area = sei_page; + sei = sei_page; CIO_TRACE_EVENT(2, "prcss"); - do { - memset(sei_area, 0, sizeof(*sei_area)); - sei_area->request.length = 0x0010; - sei_area->request.code = 0x000e; - if (chsc(sei_area)) - break; - if (sei_area->response.code == 0x0001) { - CIO_CRW_EVENT(4, "chsc: sei successful\n"); - chsc_process_sei(sei_area); - } else { - CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n", - sei_area->response.code); - break; - } - } while (sei_area->flags & 0x80); + /* + * The ntsm does not allow to select NT0 and NT2 together. We need to + * first check for NT2, than additionally for NT0... + */ +#ifdef CONFIG_PCI + if (!__chsc_process_crw(sei, CHSC_SEI_NT2)) +#endif + __chsc_process_crw(sei, CHSC_SEI_NT0); } void chsc_chp_online(struct chp_id chpid) -- 1.7.12.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/