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path: root/drivers/virtio/virtio_pci_common.h
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* virtio: add context flag to find vqsMichael S. Tsirkin2017-05-021-1/+3
| | | | | | | | | | | Allows maintaining extra context per vq. For ease of use, passing in NULL is legal and disables the feature for all vqs. Includes fixes by Christian for s390, acked by Cornelia. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* Revert "virtio_pci: remove struct virtio_pci_vq_info"Michael S. Tsirkin2017-04-111-3/+22
| | | | | | | | | | | | | | | | This reverts commit 5c34d002dcc7a6dd665a19d098b4f4cd5501ba1a. Conflicts: drivers/virtio/virtio_pci_common.c The cleanup seems to be one of the changes that broke hybernation for some users. We are still not sure why but revert helps. This reverts the cleanup changes but keeps the affinity support. Tested-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* Revert "virtio_pci: use shared interrupts for virtqueues"Michael S. Tsirkin2017-04-111-2/+14
| | | | | | | | | | | | | | | | | | | This reverts commit 07ec51480b5eb1233f8c1b0f5d7a7c8d1247c507. Conflicts: drivers/virtio/virtio_pci_common.c Unfortunately the idea does not work with threadirqs as more than 32 queues can then map to a single interrupts. Further, the cleanup seems to be one of the changes that broke hybernation for some users. We are still not sure why but revert helps. This reverts the cleanup changes but keeps the affinity support. Tested-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* Revert "virtio_pci: don't duplicate the msix_enable flag in struct pci_dev"Michael S. Tsirkin2017-04-111-0/+2
| | | | | | | | | | | This reverts commit 53a020c661741f3b87ad3ac6fa545088aaebac9b. The cleanup seems to be one of the changes that broke hybernation for some users. We are still not sure why but revert helps. Tested-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio: provide a method to get the IRQ affinity mask for a virtqueueChristoph Hellwig2017-02-271-0/+2
| | | | | | | | | | This basically passed up the pci_irq_get_affinity information through virtio through an optional get_vq_affinity method. It is only implemented by the PCI backend for now, and only when we use per-virtqueue IRQs. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio: allow drivers to request IRQ affinity when creating VQsChristoph Hellwig2017-02-271-3/+2
| | | | | | | | | | | | | | Add a struct irq_affinity pointer to the find_vqs methods, which if set is used to tell the PCI layer to create the MSI-X vectors for our I/O virtqueues with the proper affinity from the start. Compared to after the fact affinity hints this gives us an instantly working setup and allows to allocate the irq descritors node-local and avoid interconnect traffic. Last but not least this will allow blk-mq queues are created based on the interrupt affinity for storage drivers. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: don't duplicate the msix_enable flag in struct pci_devChristoph Hellwig2017-02-271-2/+0
| | | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: use shared interrupts for virtqueuesChristoph Hellwig2017-02-271-14/+2
| | | | | | | | | | | | | | | | | | | | | This lets IRQ layer handle dispatching IRQs to separate handlers for the case where we don't have per-VQ MSI-X vectors, and allows us to greatly simplify the code based on the assumption that we always have interrupt vector 0 (legacy INTx or config interrupt for MSI-X) available, and any other interrupt is request/freed throught the VQ, even if the actual interrupt line might be shared in some cases. This allows removing a great deal of variables keeping track of the interrupt state in struct virtio_pci_device, as we can now simply walk the list of VQs and deal with per-VQ interrupt handlers there, and only treat vector 0 special. Additionally clean up the VQ allocation code to properly unwind on error instead of having a single global cleanup label, which is error prone, and in this case also leads to more code. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: remove struct virtio_pci_vq_infoChristoph Hellwig2017-02-271-22/+3
| | | | | | | | | | | | | | | | We don't really need struct virtio_pci_vq_info, as most field in there are redundant: - the vq backpointer is not strictly neede to start with - the entry in the vqs list is not needed - the generic virtqueue already has list, we only need to check if it has a callback to get the same semantics - we can use a simple array to look up the MSI-X vec if needed. - That simple array now also duoble serves to replace the per_vq_vectors flag Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: use pci_alloc_irq_vectorsChristoph Hellwig2016-12-161-1/+0
| | | | | | | | This avoids the separate allocation for the msix_entries structures, and instead allows us to use pci_irq_vector to find a given IRQ vector. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: Use the DMA API if enabledAndy Lutomirski2016-03-021-6/+0
| | | | | | | | | | | | | This switches to vring_create_virtqueue, simplifying the driver and adding DMA API support. This fixes virtio-pci on platforms and busses that have IOMMUs. This will break the experimental QEMU Q35 IOMMU support until QEMU is fixed. In exchange, it fixes physical virtio hardware as well as virtio-pci running under Xen. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio: make find_vqs() checkpatch.pl-friendlyStefan Hajnoczi2016-01-121-1/+1
| | | | | | | | | | | | | | | | | | | 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>
* virtio-pci: alloc only resources actually used.Gerd Hoffmann2015-06-241-0/+2
| | | | | | | | | | Move resource allocation from common code to legacy and modern code. Only request resources actually used, i.e. bar0 in legacy mode and the bar(s) specified by capabilities in modern mode. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: add an option to disable legacy driverMichael S. Tsirkin2015-01-211-0/+10
| | | | | | | | | Useful for testing device virtio 1 compatibility. Based on patch by Rusty - couldn't resist putting that flying car joke in there! Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* virtio_pci_modern: reduce number of mappingsMichael S. Tsirkin2015-01-211-0/+3
| | | | | | | | | | | We don't know the # of VQs that drivers are going to use so it's hard to predict how much memory we'll need to map. However, the relevant capability does give us an upper limit. If that's below a page, we can reduce the number of required mappings by mapping it all once ahead of the time. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* virtio_pci: modern driverMichael S. Tsirkin2015-01-211-3/+22
| | | | | | | | | | | | | | | | Lightly tested against qemu. One thing *not* implemented here is separate mappings for descriptor/avail/used rings. That's nice to have, will be done later after we have core support. This also exposes the PCI layout to userspace, and adds macros for PCI layout offsets: QEMU wants it, so why not? Trust, but verify. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: move probe/remove code to commonMichael S. Tsirkin2015-01-211-3/+2
| | | | | | | | Most of initialization is device-independent. Let's move it to common. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* virtio_pci: device-specific release callbackMichael S. Tsirkin2015-01-061-1/+0
| | | | | | | | | It turns out we need to add device-specific code in release callback. Move it to virtio_pci_legacy.c. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: move probe to common fileMichael S. Tsirkin2014-12-141-3/+3
| | | | | | It turns out this make everything easier. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci_common.h: drop VIRTIO_PCI_NO_LEGACYMichael S. Tsirkin2014-12-111-1/+0
| | | | | | | Legacy drivers use virtio_pci_common.h too, we should not define VIRTIO_PCI_NO_LEGACY there. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* virtio_pci: rename virtio_pci -> virtio_pci_commonMichael S. Tsirkin2014-12-091-0/+136
kbuild does not seem to like it when we name source files same as the module. Let's rename virtio_pci -> virtio_pci_common, and get rid of #include-ing c files. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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