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    Subject[PATCH 2/2] hpsa: export resettable_on_kexec host attribute
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    Date
    From: Stephen M. Cameron <scameron@beardog.cce.hp.com>

    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 <scameron@beardog.cce.hp.com>
    ---
    drivers/scsi/hpsa.c | 41 +++++++++++++++++++++++++++++++++++++++++
    1 files changed, 41 insertions(+), 0 deletions(-)

    diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
    index dcabef4..1d4fe80 100644
    --- a/drivers/scsi/hpsa.c
    +++ b/drivers/scsi/hpsa.c
    @@ -273,6 +273,44 @@ static ssize_t host_show_transport_mode(struct device *dev,
    "performant" : "simple");
    }

    +/* 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 */
    + 0x3223103C, /* Smart Array P800 */
    + 0x3234103C, /* Smart Array P400 */
    + 0x323D103C, /* Smart Array P700m */
    +};
    +
    +static int resettable_on_kexec(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_on_kexec(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct ctlr_info *h;
    + struct Scsi_Host *shost = class_to_shost(dev);
    +
    + h = shost_to_hba(shost);
    + return snprintf(buf, 20, "%d\n", resettable_on_kexec(h));
    +}
    +
    static inline int is_logical_dev_addr_mode(unsigned char scsi3addr[])
    {
    return (scsi3addr[3] & 0xC0) == 0x40;
    @@ -379,6 +417,8 @@ static DEVICE_ATTR(commands_outstanding, S_IRUGO,
    host_show_commands_outstanding, NULL);
    static DEVICE_ATTR(transport_mode, S_IRUGO,
    host_show_transport_mode, NULL);
    +static DEVICE_ATTR(resettable_on_kexec, S_IRUGO,
    + host_show_resettable_on_kexec, NULL);

    static struct device_attribute *hpsa_sdev_attrs[] = {
    &dev_attr_raid_level,
    @@ -392,6 +432,7 @@ static struct device_attribute *hpsa_shost_attrs[] = {
    &dev_attr_firmware_revision,
    &dev_attr_commands_outstanding,
    &dev_attr_transport_mode,
    + &dev_attr_resettable_on_kexec,
    NULL,
    };



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