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Commit 12c957dc authored by Tim Sell's avatar Tim Sell Committed by Greg Kroah-Hartman
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staging: unisys: visorbus: allow visorhba device to be used for kdump 



This patch saves off the create_bus and create_device controlvm messages
for the visorhba device, so that they can be resurrected and used in the
kdump kernel.

After this patch, a crash dump can be generated using:

    # service kdump start
    # echo 1 > /proc/sys/kernel/sysrq
    # echo c > /proc/sysrq-trigger

Signed-off-by: default avatarTimothy Sell <timothy.sell@unisys.com>
Signed-off-by: default avatarDavid Kershner <david.kershner@unisys.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c732623b

drivers/staging/unisys/visorbus/visorchipset.c

+62 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ static int visorchipset_major; 
static int visorchipset_visorbusregwait = 1;	/* default is on */

static int visorchipset_holdchipsetready;

static unsigned long controlvm_payload_bytes_buffered;

static u32 dump_vhba_bus;



static int

visorchipset_open(struct inode *inode, struct file *file)
@@ -858,6 +859,59 @@ enum crash_obj_type { 
	CRASH_BUS,

};



static void

save_crash_message(struct controlvm_message *msg, enum crash_obj_type typ)

{

	u32 local_crash_msg_offset;

	u16 local_crash_msg_count;



	if (visorchannel_read(controlvm_channel,

			      offsetof(struct spar_controlvm_channel_protocol,

				       saved_crash_message_count),

			      &local_crash_msg_count, sizeof(u16)) < 0) {

		POSTCODE_LINUX_2(CRASH_DEV_CTRL_RD_FAILURE_PC,

				 POSTCODE_SEVERITY_ERR);

		return;

	}



	if (local_crash_msg_count != CONTROLVM_CRASHMSG_MAX) {

		POSTCODE_LINUX_3(CRASH_DEV_COUNT_FAILURE_PC,

				 local_crash_msg_count,

				 POSTCODE_SEVERITY_ERR);

		return;

	}



	if (visorchannel_read(controlvm_channel,

			      offsetof(struct spar_controlvm_channel_protocol,

				       saved_crash_message_offset),

			      &local_crash_msg_offset, sizeof(u32)) < 0) {

		POSTCODE_LINUX_2(CRASH_DEV_CTRL_RD_FAILURE_PC,

				 POSTCODE_SEVERITY_ERR);

		return;

	}



	if (typ == CRASH_BUS) {

		if (visorchannel_write(controlvm_channel,

				       local_crash_msg_offset,

				       msg,

				       sizeof(struct controlvm_message)) < 0) {

			POSTCODE_LINUX_2(SAVE_MSG_BUS_FAILURE_PC,

					 POSTCODE_SEVERITY_ERR);

			return;

		}

	} else {

		local_crash_msg_offset += sizeof(struct controlvm_message);

		if (visorchannel_write(controlvm_channel,

				       local_crash_msg_offset,

				       msg,

				       sizeof(struct controlvm_message)) < 0) {

			POSTCODE_LINUX_2(SAVE_MSG_DEV_FAILURE_PC,

					 POSTCODE_SEVERITY_ERR);

			return;

		}

	}

}



static void

bus_responder(enum controlvm_id cmd_id,

	      struct controlvm_message_header *pending_msg_hdr,
@@ -1118,6 +1172,10 @@ bus_create(struct controlvm_message *inmsg) 
		goto cleanup;

	}

	bus_info->visorchannel = visorchannel;

	if (uuid_le_cmp(cmd->create_bus.bus_inst_uuid, spar_siovm_uuid) == 0) {

		dump_vhba_bus = bus_no;

		save_crash_message(inmsg, CRASH_BUS);

	}



	POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO);
@@ -1254,6 +1312,10 @@ my_device_create(struct controlvm_message *inmsg) 
	}

	dev_info->visorchannel = visorchannel;

	dev_info->channel_type_guid = cmd->create_device.data_type_uuid;

	if (uuid_le_cmp(cmd->create_device.data_type_uuid,

			spar_vhba_channel_protocol_uuid) == 0)

		save_crash_message(inmsg, CRASH_DEV);



	POSTCODE_LINUX_4(DEVICE_CREATE_EXIT_PC, dev_no, bus_no,

			 POSTCODE_SEVERITY_INFO);

cleanup: