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Commit 957c2ec5 authored by Stephen M. Cameron's avatar Stephen M. Cameron Committed by Jens Axboe
Browse files

cciss: export resettable host attribute 



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: default avatarStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 03567812

Documentation/ABI/testing/sysfs-bus-pci-devices-cciss

+12 −0
Original line number Diff line number Diff line
@@ -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/<dev>/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.

drivers/block/cciss.c

+39 −0
Original line number Diff line number Diff line
@@ -556,6 +556,44 @@ 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)
@@ -741,6 +779,7 @@ 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

};