From 12c957dc942c993853fa3f357b9071b8633ef383 Mon Sep 17 00:00:00 2001
From: Tim Sell <Timothy.Sell@unisys.com>
Date: Tue, 1 Mar 2016 19:45:04 -0500
Subject: [PATCH] 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: Timothy Sell <timothy.sell@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
.../staging/unisys/visorbus/visorchipset.c | 62 +++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index 166a067e8bb4b..55158455c5346 100644
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -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:
--
2.30.2