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2017-01-19virtio/s390: virtio: constify virtio_config_ops structuresBhumika Goyal1-1/+1
Declare virtio_config_ops structure as const as it is only stored in the config field of a virtio_device structure. This field is of type const, so virtio_config_ops structures having this property can be declared const. Done using Coccinelle: @r1 disable optional_qualifier@ identifier i; position p; @@ static struct virtio_config_ops i@p={...}; @ok1@ identifier r1.i; position p; struct virtio_ccw_device x; @@ x.vdev.config=&i@p @bad@ position p!={r1.p,ok1.p}; identifier r1.i; @@ i@p @depends on !bad disable optional_qualifier@ identifier r1.i; @@ +const struct virtio_config_ops i; File size before and after applying the patch remains the same. text data bss dec hex filename 9235 296 32928 42459 a5db drivers/s390/virtio/virtio_ccw.o Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Message-Id: <1484333336-13443-1-git-send-email-bhumirks@gmail.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2017-01-19virtio/s390: add missing \n to end of dev_err messageColin Ian King1-1/+1
Trival fix, dev_err message is missing a \n, so add it. Signed-off-by: Colin Ian King <colin.king@canonical.com> Message-Id: <20160927200844.16008-1-colin.king@canonical.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2017-01-19virtio/s390: support READ_STATUS command for virtio-ccwPierre Morel1-0/+25
As virtio-1 introduced the possibility of the device manipulating the status byte, revision 2 of the virtio-ccw transport introduced a means of getting the status byte from the device via READ_STATUS. Let's wire it up for revisions >= 2 and fall back to returning the stored status byte if not supported. Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2017-01-16s390: use false/true when using boolHeiko Carstens1-1/+1
Yet another trivial patch to reduce the noise that coccinelle generates. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-10-31s390: virtio: make ccw explicitly non-modularPaul Gortmaker1-23/+2
The Kconfig currently controlling compilation of this code is: arch/s390/Kconfig:config S390_GUEST arch/s390/Kconfig: def_bool y ...meaning that it currently is not being built as a module by anyone. Lets remove the modular code that is essentially orphaned, so that when reading the driver there is no doubt it is builtin-only. Since module_init translates to device_initcall in the non-modular case, the init ordering remains unchanged with this commit. Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code. We replace module.h with moduleparam.h since the file does declare some module_param() and leaving that as-is is currently the easiest way to remain compatible with existing boot arg use cases. Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: linux-s390@vger.kernel.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-08-09virtio/s390: deprecate old transportCornelia Huck2-1/+7
There only ever have been two host implementations of the old s390-virtio (pre-ccw) transport: the experimental kuli userspace, and qemu. As qemu switched its default to ccw with 2.4 (with most users having used ccw well before that) and removed the old transport entirely in 2.6, s390-virtio probably hasn't been in active use for quite some time and is therefore likely to bitrot. Let's start the slow march towards removing the code by deprecating it. Note that this also deprecates the early virtio console code, which has been causing trouble in the guest without being wired up in any relevant hypervisor code. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> Reviewed-by: Sascha Silbe <silbe@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-08-09virtio/s390: keep early_put_charsChristian Borntraeger1-1/+1
In case the registration of the hvc tty never happens AND the kernel thinks that hvc0 is the preferred console we should keep the early printk function to avoid a kernel panic due to code being removed. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Jing Liu <liujbjl@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-03-02virtio/s390: size of SET_IND payloadCornelia Huck1-4/+8
SET_IND takes as a payload the _address_ of the indicators, meaning that we have one of the rare cases where kmalloc(sizeof(&...)) is actually correct. Let's clarify that with a comment. The count for the ccw, however, was only correct because the indicators are 64 bit. Let's use the correct value. Reported-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-03-02virtio/s390: use dev_to_virtioGeliang Tang1-2/+1
Use dev_to_virtio() instead of open-coding it. Signed-off-by: Geliang Tang <geliangtang@163.com> Message-Id: <912bf59bd3a48f2d4d4994681e898dc084fe29d3.1451484163.git.geliangtang@163.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-01-12virtio: make find_vqs() checkpatch.pl-friendlyStefan Hajnoczi2-2/+2
checkpatch.pl wants arrays of strings declared as follows: static const char * const names[] = { "vq-1", "vq-2", "vq-3" }; Currently the find_vqs() function takes a const char *names[] argument so passing checkpatch.pl's const char * const names[] results in a compiler error due to losing the second const. This patch adjusts the find_vqs() prototype and updates all virtio transports. This makes it possible for virtio_balloon.c, virtio_input.c, virtgpu_kms.c, and virtio_rpmsg_bus.c to use the checkpatch.pl-friendly type. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
2015-12-17virtio/s390: handle error values in irbCornelia Huck1-25/+37
The common I/O layer may pass an error value as the irb in the device's interrupt handler (for classic channel I/O). This won't happen in current virtio-ccw implementations, but it's better to be safe than sorry. Let's just return the error conveyed by the irb and clear any possible pending I/O indications. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Guenther Hutzl <hutzl@linux.vnet.ibm.com> Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-10-14s390/diag: add a statistic for diagnose callsMartin Schwidefsky1-3/+12
Introduce /sys/debug/kernel/diag_stat with a statistic how many diagnose calls have been done by each CPU in the system. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2015-09-16virtio/s390: handle failures of READ_VQ_CONF ccwPierre Morel1-1/+9
In virtio_ccw_read_vq_conf() the return value of ccw_io_helper() was not checked. If the configuration could not be read properly, we'd wrongly assume a queue size of 0. Let's propagate any I/O error to virtio_ccw_setup_vq() so it may properly fail. Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-07-07virtio/s390: rename drivers/s390/kvm -> drivers/s390/virtioCornelia Huck3-0/+1899
This more accurately reflects what these drivers actually do. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>