Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752611Ab1CJUX2 (ORCPT ); Thu, 10 Mar 2011 15:23:28 -0500 Received: from g4t0017.houston.hp.com ([15.201.24.20]:18717 "EHLO g4t0017.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751927Ab1CJUX1 (ORCPT ); Thu, 10 Mar 2011 15:23:27 -0500 Subject: [PATCH] cciss: export resettable host attribute To: axboe@kernel.dk From: "Stephen M. Cameron" Cc: mikem@beardog.cce.hp.com, akpm@linux-foundation.org, thenzl@redhat.com, linux-kernel@vger.kernel.org, smcameron@yahoo.com Date: Thu, 10 Mar 2011 14:23:26 -0600 Message-ID: <20110310202326.30581.9475.stgit@beardog.cce.hp.com> User-Agent: StGit/0.15 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3726 Lines: 98 From: Stephen M. Cameron This attribute, requested by Redhat, allows kexec-tools to know whether the controller can honor the reset_devices kernel parameter and actually reset the controller. For kdump to work properly it is necessary that the reset_devices parameter be honored. This attribute enables kexec-tools to warn the user if they attempt to designate a non-resettable controller as the dump device. Signed-off-by: Stephen M. Cameron --- .../ABI/testing/sysfs-bus-pci-devices-cciss | 12 ++++++ drivers/block/cciss.c | 39 ++++++++++++++++++++ 2 files changed, 51 insertions(+), 0 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss index 4f29e5f..f5bb0a3 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss +++ b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss @@ -59,3 +59,15 @@ Kernel Version: 2.6.31 Contact: iss_storagedev@hp.com Description: Displays the usage count (number of opens) of logical drive Y of controller X. + +Where: /sys/bus/pci/devices//ccissX/resettable +Date: February 2011 +Kernel Version: 2.6.38 +Contact: iss_storagedev@hp.com +Description: Value of 1 indicates the controller can honor the reset_devices + kernel parameter. Value of 0 indicates reset_devices cannot be + honored. This is to allow, for example, kexec tools to be able + to warn the user if they designate an unresettable device as + a dump device, as kdump requires resetting the device in order + to work reliably. + diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 8e52e63..f6a9fdb 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -560,6 +560,44 @@ static void __devinit cciss_procinit(ctlr_info_t *h) #define to_hba(n) container_of(n, struct ctlr_info, dev) #define to_drv(n) container_of(n, drive_info_struct, dev) +/* List of controllers which cannot be reset on kexec with reset_devices */ +static u32 unresettable_controller[] = { + 0x324a103C, /* Smart Array P712m */ + 0x324b103C, /* SmartArray P711m */ + 0x3223103C, /* Smart Array P800 */ + 0x3234103C, /* Smart Array P400 */ + 0x3235103C, /* Smart Array P400i */ + 0x3211103C, /* Smart Array E200i */ + 0x3212103C, /* Smart Array E200 */ + 0x3213103C, /* Smart Array E200i */ + 0x3214103C, /* Smart Array E200i */ + 0x3215103C, /* Smart Array E200i */ + 0x3237103C, /* Smart Array E500 */ + 0x323D103C, /* Smart Array P700m */ + 0x409C0E11, /* Smart Array 6400 */ + 0x409D0E11, /* Smart Array 6400 EM */ +}; + +static int ctlr_is_resettable(struct ctlr_info *h) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(unresettable_controller); i++) + if (unresettable_controller[i] == h->board_id) + return 0; + return 1; +} + +static ssize_t host_show_resettable(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ctlr_info *h = to_hba(dev); + + return snprintf(buf, 20, "%d\n", ctlr_is_resettable(h)); +} +static DEVICE_ATTR(resettable, S_IRUGO, host_show_resettable, NULL); + static ssize_t host_store_rescan(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) @@ -745,6 +783,7 @@ static DEVICE_ATTR(usage_count, S_IRUGO, cciss_show_usage_count, NULL); static struct attribute *cciss_host_attrs[] = { &dev_attr_rescan.attr, + &dev_attr_resettable.attr, NULL }; -- 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/