Commit Graph

17 Commits

Author SHA1 Message Date
Dominik Dingel c8cda8748e s390/IPL: Allow boot from other ssid than 0
We now take the subchannel set id also into account to find the boot device.
If we want to use a subchannel set other than the default set 0, we first
need to enable the mss facility.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-07-29 12:02:00 +02:00
Christian Borntraeger 39c93c67c5 s390/ipl: Fix spurious errors in virtio
With the ccw ipl code sometimes an error message like
"virtio: trying to map MMIO memory" or
"Guest moved used index from %u to %u" appeared. Turns out
that the ccw bios did not zero out the vring, which might
cause stale values in avail->idx and friends, especially
on reboot.

Lets zero out the relevant fields. To activate the patch we
need to rebuild s390-ccw.img as well.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-id: 1369309901-418-1-git-send-email-borntraeger@de.ibm.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-05-31 12:50:46 -05:00
Dominik Dingel ff151f4ec9 S390: BIOS boot from given device
Use the passed device, if there is no device, use the first applicable device.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-05-06 17:30:01 +02:00
Cornelia Huck abbbe3de4a s390-ccw.img: Get queue config from host.
Ask the host about the configuration instead of guessing it.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Cornelia Huck 0f3f1f302f s390-ccw.img: Rudimentary error checking.
Try to handle at least some of the errors that may happen.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Cornelia Huck 776e7f0f21 s390-ccw.img: Enhance drain_irqs().
- Use tpi + tsch to get interrupts.
- Return an error if the irb indicates problems.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Cornelia Huck 22d67ab55a s390-ccw.img: Detect devices with stsch.
stsch is the canonical way to detect devices. As a bonus, we can
abort the loop if we get cc 3, and we need to check only the valid
devices (dnv set).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Christian Borntraeger dc03640b58 s390-ccw.img: Fix compile warning in s390 ccw virtio code
Lets fix this gcc warning:

virtio.c: In function ‘vring_send_buf’:
virtio.c:125:35: error: operation on ‘vr->next_idx’ may be undefined
[-Werror=sequence-point]

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Christian Borntraeger 6328801f19 s390-ccw.img: Take care of the elf->img transition
We have to call strip with s390-ccw.elf as input and
s390-ccw.img as output

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Christian Borntraeger 7f61cbc108 s390-ccw.img: replace while loop with a disabled wait on s390 bios
dont waste cpu power on an error condition. Lets stop the guest
with a disabled wait.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Alexander Graf b462fcd57c S390: ccw firmware: Add Makefile
This patch adds a makefile, so we can build our ccw firmware. Also
add the resulting binaries to .gitignore, so that nobody is annoyed
they might be in the tree.

Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Alexander Graf 685d49a63e S390: ccw firmware: Add bootmap interpreter
On s390, there is an architected boot map format that we can read to
boot a certain entry off the disk. Implement a simple reader for this
that always boots the first (default) entry.

Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Alexander Graf c9c39d3b5e S390: ccw firmware: Add glue header
Like all great programs, we have to call between different functions in
different object files. And all of them need a common ground of defines.

Provide a file that provides these defines.

Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Alexander Graf 1e17c2c15b S390: ccw firmware: Add virtio device drivers
In order to boot, we need to be able to access a virtio-blk device through
the CCW bus. Implement support for this.

Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Alexander Graf 0369b2eb07 S390: ccw firmware: Add sclp output
In order to communicate with the user, we need an I/O mechanism that he
can read. Implement SCLP ASCII support, which happens to be the default
in the s390 ccw machine.

This file is missing read support for now. It can only print messages.

Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Alexander Graf 92f2ca38b0 S390: ccw firmware: Add main program
This C file is the main driving piece of the s390 ccw firmware. It
provides a search for a workable block device, sets it as the default
to boot off of and boots from it.

Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00
Alexander Graf 80fea6e893 S390: ccw firmware: Add start assembly
We want to write most of our code in C, so add a small assembly
stub that jumps straight into C code for us to continue booting.

Signed-off-by: Alexander Graf <agraf@suse.de>
2013-04-26 20:18:24 +02:00