From patchwork Sat Aug 9 05:45:45 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vasant Hegde X-Patchwork-Id: 378723 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id E7F7814011E for ; Sat, 9 Aug 2014 15:47:06 +1000 (EST) Received: from ozlabs.org (ozlabs.org [103.22.144.67]) by lists.ozlabs.org (Postfix) with ESMTP id A68CC1A0B5A for ; Sat, 9 Aug 2014 15:47:06 +1000 (EST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from e23smtp09.au.ibm.com (e23smtp09.au.ibm.com [202.81.31.142]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 70DBA1A0AA3 for ; Sat, 9 Aug 2014 15:45:53 +1000 (EST) Received: from /spool/local by e23smtp09.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sat, 9 Aug 2014 15:45:50 +1000 Received: from d23relay08.au.ibm.com (d23relay08.au.ibm.com [9.185.71.33]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id B59AD3578023 for ; Sat, 9 Aug 2014 15:45:49 +1000 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay08.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s795kQ4G14352560 for ; Sat, 9 Aug 2014 15:46:26 +1000 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s795jmBM028007 for ; Sat, 9 Aug 2014 15:45:49 +1000 Received: from hegdevasant.in.ibm.com ([9.126.239.65]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id s795jjsK027997; Sat, 9 Aug 2014 15:45:47 +1000 Subject: [PATCH v3 2/2] powerpc/powernv: Interface to register/unregister opal dump region To: linuxppc-dev@lists.ozlabs.org From: Vasant Hegde Date: Sat, 09 Aug 2014 11:15:45 +0530 Message-ID: <20140809054540.17676.34572.stgit@hegdevasant.in.ibm.com> In-Reply-To: <20140809054424.17676.1090.stgit@hegdevasant.in.ibm.com> References: <20140809054424.17676.1090.stgit@hegdevasant.in.ibm.com> User-Agent: StGit/0.16 MIME-Version: 1.0 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14080905-3568-0000-0000-0000000DC932 Cc: Andrew Morton , Linus Torvalds , linux-kernel@vger.kernel.org X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" PowerNV platform is capable of capturing host memory region when system crashes (because of host/firmware). We have new OPAL API to register/ unregister memory region to be captured when system crashes. This patch adds support for new API. Also during boot time we register kernel log buffer and unregister before doing kexec. Signed-off-by: Vasant Hegde Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/opal.h | 11 +++++++++++ arch/powerpc/platforms/powernv/opal-wrappers.S | 2 ++ arch/powerpc/platforms/powernv/opal.c | 23 +++++++++++++++++++++++ 3 files changed, 36 insertions(+) diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index b2f8ce1..86055e5 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -149,6 +149,8 @@ struct opal_sg_list { #define OPAL_DUMP_INFO2 94 #define OPAL_PCI_EEH_FREEZE_SET 97 #define OPAL_HANDLE_HMI 98 +#define OPAL_REGISTER_DUMP_REGION 101 +#define OPAL_UNREGISTER_DUMP_REGION 102 #ifndef __ASSEMBLY__ @@ -920,6 +922,8 @@ int64_t opal_set_param(uint64_t token, uint32_t param_id, uint64_t buffer, uint64_t length); int64_t opal_sensor_read(uint32_t sensor_hndl, int token, __be32 *sensor_data); int64_t opal_handle_hmi(void); +int64_t opal_register_dump_region(uint32_t id, uint64_t start, uint64_t end); +int64_t opal_unregister_dump_region(uint32_t id); /* Internal functions */ extern int early_init_dt_scan_opal(unsigned long node, const char *uname, @@ -974,6 +978,13 @@ struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, unsigned long vmalloc_size); void opal_free_sg_list(struct opal_sg_list *sg); +/* + * Dump region ID range usable by the OS + */ +#define OPAL_DUMP_REGION_HOST_START 0x80 +#define OPAL_DUMP_REGION_LOG_BUF 0x80 +#define OPAL_DUMP_REGION_HOST_END 0xFF + #endif /* __ASSEMBLY__ */ #endif /* __OPAL_H */ diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index a328be4..2e6ce1b 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -245,3 +245,5 @@ OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ); OPAL_CALL(opal_get_param, OPAL_GET_PARAM); OPAL_CALL(opal_set_param, OPAL_SET_PARAM); OPAL_CALL(opal_handle_hmi, OPAL_HANDLE_HMI); +OPAL_CALL(opal_register_dump_region, OPAL_REGISTER_DUMP_REGION); +OPAL_CALL(opal_unregister_dump_region, OPAL_UNREGISTER_DUMP_REGION); diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index f0a01a4..b44eec3 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -605,6 +605,24 @@ static int opal_sysfs_init(void) return 0; } +static void __init opal_dump_region_init(void) +{ + void *addr; + uint64_t size; + int rc; + + /* Register kernel log buffer */ + addr = log_buf_addr_get(); + size = log_buf_len_get(); + rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, + __pa(addr), size); + /* Don't warn if this is just an older OPAL that doesn't + * know about that call + */ + if (rc && rc != OPAL_UNSUPPORTED) + pr_warn("DUMP: Failed to register kernel log buffer. " + "rc = %d\n", rc); +} static int __init opal_init(void) { struct device_node *np, *consoles; @@ -654,6 +672,8 @@ static int __init opal_init(void) /* Create "opal" kobject under /sys/firmware */ rc = opal_sysfs_init(); if (rc == 0) { + /* Setup dump region interface */ + opal_dump_region_init(); /* Setup error log interface */ rc = opal_elog_init(); /* Setup code update interface */ @@ -694,6 +714,9 @@ void opal_shutdown(void) else mdelay(10); } + + /* Unregister memory dump region */ + opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); } /* Export this so that test modules can use it */