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2015-06-30s390-ccw.img: Consume service interruptsChristian Borntraeger
We have to consume the outstanding service interrupt after each service call, otherwise a correct implementation will return CC=2 on subsequent service calls. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2015-06-15s390/bios: build with -fdelete-null-pointer-checksAurelien Jarno
Starting with version 4.9, GCC assumes it can't safely dereference null pointers, and uses this for some optimizations. On s390, the lowcore memory is located at address 0, so this assumption is wrong and breaks the s390-ccw firmware. Pass -fdelete-null-pointer-checks to avoid that. Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Alexander Graf <agraf@suse.de> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Message-Id: <1434363843-14576-1-git-send-email-aurelien@aurel32.net> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2015-03-11s390/bios: Make the s390-ccw.img relocatableThomas Huth
The current bios sits at location 0x7e00000 in the guest RAM and thus prevents loading of bigger ramdisks. By making the image relocatable we can move it to the end of the RAM so that it is getting out of the way. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Message-Id: <1425895973-15239-3-git-send-email-thuth@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> [Fixup build failure on 32 bit hosts]
2015-03-10s390-ccw.img: Reinitialize guessing on rebootChristian Borntraeger
guessed_disk_nature is a static zero variable. As the QEMU ELF loader does not zero the BSS section, lets do it explicitely here. This fixes reboot for some corner cases (like FCP flash devices with logical_block_size=512, physical_block_size=4096) Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Tested-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Message-Id: <1425310029-53396-3-git-send-email-borntraeger@de.ibm.com>
2015-03-10s390-ccw.img: Allow bigger ramdisk sizes or offsetsChristian Borntraeger
The s390-ccw bios creates the the virtqueue at 100MB. For big ramdisks or offsets (via zipl) this gets overwritten. As a quick band-aid, lets move the virtqueue into the bss section, which is at 0x7f00000. As the bios code (text) is at 0x7e00000 we can now handle ramdisk which are ~27MB bigger. Long term we want to make the s390-ccw bios position independent and load of at the end of memory. Reported-by: Alexander Graf <agraf@suse.de> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Message-Id: <1425310029-53396-2-git-send-email-borntraeger@de.ibm.com>
2015-02-03pc-bios/s390-ccw: fix sparse warningsChristian Borntraeger
Fix some sparse warnings in the s390-ccw bios. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-09-01pc-bios/s390-ccw: Do proper console setupChristian Borntraeger
The final newline/return must happen before we reset the sclp via diag 308. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-09-01pc-bios/s390-ccw: IPL from DASD with format variationsEugene (jno) Dvurechenski
There are two known cases of DASD format where signatures are incomplete or absent: 1. result of <dasdfmt -d ldl -L ...> (ECKD_LDL_UNLABELED) 2. CDL with zero keys in IPL1 and IPL2 records Now the code attempts to 1. find zIPL and use SCSI layout 2. find IPL1 and use CDL layout 3. find CMS1 and use LDL layout 3. find LNX1 and use LDL layout 4. find zIPL and use unlabeled LDL layout 5. find zIPL and use CDL layout 6. die in this sequence. Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-09-01pc-bios/s390-ccw Really big EAV ECKD DASD handlingEugene (jno) Dvurechenski
For EAV ECKD DASD, the cylinder count will have the magic value 0xfffeU. Therefore, use the block number to test for valid eckd addresses instead. Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-09-01pc-bios/s390-ccw Improve ECKD informational messageEugene (jno) Dvurechenski
Add block size display to ECKD scheme report. Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-09-01pc-bios/s390-ccw: handle more ECKD DASD block sizesEugene (jno) Dvurechenski
Using dasdfmt(8) to format a DASD allows to choose a block size. There are four supported values: 512, 1024, 2048, and 4096 bytes per block. Each block size leads to selection of new count of sectors per track. The head count remains always the same: 15. This empiric knowledge is used to detect ECKD DASD to IPL from. Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-09-01pc-bios/s390-ccw: support all virtio block sizeEugene (jno) Dvurechenski
The block size value may be given "as is" OR as a base value and a shift count (exponent). So, we have to use calculation to get the proper number in the code. The main expression reads as (blk_cfg.blk_size << blk_cfg.physical_block_exp) E.g., various combinations between blk_size=1/physical_block_exp=12 and blk_size=4096/physical_block_exp=0 are valid for 4K blocks. Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-08pc-bios/s390-ccw: store proper subsystem information wordChristian Borntraeger
POP chapter 17 requires to store a subsystem information word at 184 during IPL. Furthermore bytes 188-191 should be zero. The bootmap might contain data blocks that are written to the first page. We have to write these values after we processed the bootmap and before the final IPL. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: IPL from LDL/CMS-formatted ECKD DASDEugene (jno) Dvurechenski
Add code that allows us to start from two further ECKD DASD disk layouts: LDL (Linux disk layout) and CMS (cms-formatted disk). Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: IPL from CDL-formatted ECKD DASDEugene (jno) Dvurechenski
Add code that allows us to start from ECKD DASD using the z/OS compatible disk layout (CDL), which is the most common format for ECKD DASD. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: factor out ipl codeEugene (jno) Dvurechenski
Move the scsi-disk specific ipl code from zipl_load() into a new function ipl_scsi(). This makes it easier to add ipl routines for other disk types. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: Add fill_hex_val func to provide better msgsEugene (jno) Dvurechenski
Factor out helper function for dumping a hex value into a buffer. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: Unify error handlingEugene (jno) Dvurechenski
Convert to IPL_assert and friends Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: add some utility codeEugene (jno) Dvurechenski
IPL_assert(term,message) is introduced to handle error conditions. ebcdic_to_ascii() to convert chars (mostly to print VOLSERs). read_block() provision for unified block-number handling. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: handle different sector sizesEugene (jno) Dvurechenski
Use the virtio device's configuration to figure out the disk geometry and use a sector size based upon the layout. [CH: s/SECTOR_SIZE/MAX_SECTOR_SIZE/g] Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: cleanup and enhance bootmap defintionsEugene (jno) Dvurechenski
Add declarations to describe structure of different dasd IPL sources (eckd and fba). Move the structure definitions to a new header bootmap.h. While we are at it, change structs to typedefs. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-27pc-bios/s390-ccw: make checkpatch happyEugene (jno) Dvurechenski
Remove tabs, tweak whitespace and comments. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-23pc-bios/s390-ccw: fix for fragmented SCSI bootmapEugene (jno) Dvurechenski
We need to interpret the last entry of the bootmap with zero block count as "continuation pointer". The "last entry" is being detected by pre-filling of the scratch space with known values and respective look-ahead. Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-23pc-bios/s390-ccw: do a subsystem reset before running the guestChristian Borntraeger
The loader BIOS has already activated several devices. Let's do a subsystem reset before jumping into the guest. As there is no direct way of doing so, we use diagnose 308 to bring the system in a defined state. This is similar to what kdump on s390 uses. We have to define a small trampoline function that restores the low bytes to whatever the bootmap has written there. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-06-23pc-bios/s390-ccw: virtio_load_direct() can't load max number of sectorsDavid Hildenbrand
The number of sectors to read is given by the last 16 bit of rec_list2. 1 is added in order to get to the real number of sectors to read (0x0000 -> read 1 block). For now, the maximum number (0xffff) led to 0 sectors being read. This fixes a bug where a large initrd (62MB) could not be ipled anymore. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-02-27s390-ccw.img: Fix sporadic errors with ccw boot image - initialize cssChristian Borntraeger
We have to set the cssid to 0, otherwise the stsch code will return an operand exception without the m bit. In the same way we should set m=0. This case was triggered in some cases during reboot, if for some reason the location of blk_schid.cssid contains 1 and m was 0. Turns out that the qemu elf loader does not zero out the bss section on reboot. The symptom was an dump of the old kernel with several areas overwritten. The bootloader does not register a program check handler, so bios exception jumped back into the old kernel. Lets just use a local struct with a designed initializer. That will guarantee that all other subelements are initialized to 0. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-02-27s390-ccw.img: Fix sporadic reboot hangs: Initialize next_idxChristian Borntraeger
The current code does not initialize next_idx in the virtio ring. As the ccw bios will always use guest memory at a fixed location, this queue might != 0 after a reboot. Lets make the initialization explicit. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2013-09-20s390/ipl: Fix waiting for virtio processingCornelia Huck
The guest side must not manipulate the index for the used buffers. Instead, remember the state of the used buffer locally and wait until it has moved. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2013-07-29s390/IPL: Allow boot from other ssid than 0Dominik Dingel
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>
2013-05-31s390/ipl: Fix spurious errors in virtioChristian Borntraeger
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>
2013-05-06S390: BIOS boot from given deviceDominik Dingel
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>
2013-04-26s390-ccw.img: Get queue config from host.Cornelia Huck
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>
2013-04-26s390-ccw.img: Rudimentary error checking.Cornelia Huck
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>
2013-04-26s390-ccw.img: Enhance drain_irqs().Cornelia Huck
- 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>
2013-04-26s390-ccw.img: Detect devices with stsch.Cornelia Huck
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>
2013-04-26s390-ccw.img: Fix compile warning in s390 ccw virtio codeChristian Borntraeger
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>
2013-04-26s390-ccw.img: Take care of the elf->img transitionChristian Borntraeger
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>
2013-04-26s390-ccw.img: replace while loop with a disabled wait on s390 biosChristian Borntraeger
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>
2013-04-26S390: ccw firmware: Add MakefileAlexander Graf
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>
2013-04-26S390: ccw firmware: Add bootmap interpreterAlexander Graf
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>
2013-04-26S390: ccw firmware: Add glue headerAlexander Graf
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>
2013-04-26S390: ccw firmware: Add virtio device driversAlexander Graf
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>
2013-04-26S390: ccw firmware: Add sclp outputAlexander Graf
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>
2013-04-26S390: ccw firmware: Add main programAlexander Graf
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>
2013-04-26S390: ccw firmware: Add start assemblyAlexander Graf
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>
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