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When QEMU is started with iommu_platform=on, the guest driver must accept
it or the device will fail.
This enables IOMMU support for virtio-net, -scsi, -block, -serial, -9p
devices. -serial and -9p are only compile tested though.
For virtio-net we map all RX buffers once and TX when xmit() is called
and unmap older pages when we are about to reuse the VQ descriptor.
As all other devices are synchronous, we unmap IOMMU pages right after
completion of a transaction.
This depends on QEMU's:
https://patchwork.ozlabs.org/patch/1194067/
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Tested-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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Changes:
v5:
* fixed queue size calculation
* reworked virtio_free_desc() to only unmap what is has mapped
v4:
* ditched vqs->id in virtio_queue_init_vq
v2:
* added Mike's fs/dma-instance-function.fs
* total rework
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At the moment desc/avail/used pointers are read from the device every
time we need them. This works for now unless iommu_platform=on is used,
desc/avail/used stored in the config space are bus addresses while
SLOF should keep using the guest physical addresses.
virtio-net stores queue descriptors already, virtio-serial does it in
global statics, move them into virtio_device.
The next patch will use this to allow IOMMU.
While at this, move repeating avail->flags/idx setup into
virtio_queue_init_vq() except virtio-serial which vq_rx->avail->idx is
setup differently.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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Changes:
v4:
* removed vqs::id as it is not really used
* replaced vq_size with vq->size in virtio-serial.c
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It is never called outside of virtio, make it static.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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Found that virtio-net is using a around 200K receive buffer per device, if we
connect more than 40 virtio-net devices the heap(8MB) gets over. Because of
which allocation starts failing and the VM does not boot.
Moreover, the driver did not support opening multiple device, which is possible
using the OF client interface. As it was using globals to store the state
information of the driver.
Now the driver allocates a virtio_net structure during device open stage and
fills in the state information. This details are used during various device
functions and finally for cleaning up on close operation.
Now as the buffer memory is allocated during open and freed during the close
operations the heap usage is contained.
Reported-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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Introduce parsing routines for virtio capabilities. This would also
determine whether we need to function in legacy mode or virtio 1.0.
Update routine to start using the base address from the updated legacy
structure.
With the removal for base address setting in the Forth code and most of
the device setup happening in C code, code in virtio.fs is redundant.
Remove virtio.fs and move the allocation of the virtio_device structure
to the C code instead of the Forth code in individual files. Also, drop
the packed attribute for the virtio_{device,cap} structure. The
structure is not shared anymore.
Drivers need to negotiate the 1.0 feature capability before starting to
use 1.0. Disable it in all the drivers until 1.0 is enabled.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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With virtio 1.0, there feature negotiation step needs to be completed
before starting to notify the device.
This includes following steps:
* Read host supported features
* Check if virtio 1.0 is supported
* Set guest supported features
* Read host features and compare with the guest features.
* Write FEATURES_OK and check it back to confirm.
Add virtio_get_status supporting routine.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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The new specification has a 64-bit feature register, change the
signature and update the routine to handle them.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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Convert the following routines:
virtio_get_qsize
virtio_vring_desc
virtio_get_vring_avail
virtio_get_vring_used
virtio_set_status: also use it in device reset.
virtio_queue_notify
virtio_set_qaddr
virtio_{get,read}_config
virtio_fill_desc
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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Traditionally, struct virtio_device is shared between SLOF and C code.
This still remains shared with the addition of virtio_cap structure as
well. Now both virtio_device and virtio_cap structures are shared.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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virtio device structure carries a type variable indicating whether
virtio is over PCI or VIO. While VIO is not there and no plan to
introduce other transport, there is no purpose of having this variable
around and checking for PCI.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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Enable virtio_fill_desc/fill_blk_hdr with legacy and modern mode for
further use
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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The routine takes care to allocate and set the queue address in the
device. Add these calls in virtio-net, virtio-blk and virtio-9p.
With the lack of this routine, devices like virtio-blk and virtio-9p did
not do a device reset in the driver initialization code. This helper
will fix that problem
Change the signature of virtio_set_qaddr, accepting queue address as
unsigned long argument.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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The patch does not make any functional changes.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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Current code only works with 512 bytes read.
Moreover, Qemu ignores the guest set features request. In the set
features request SLOF indicates to qemu that it is not support
VIRTIO_BLK_F_BLK_SIZE feature. Code in qemu suggests that virtio-blk
is not implementing set_guest_feature.
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
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Remove adhoc timer and put 5sec timeout. On a busy host, code hits this.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
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A simple function that can be used from forth code for setting
virtqueue address. virito-scsi has multiple virtqueues(atleast 3) and
need to use set queue address for all the 3 queues.
Signed-off-by: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Code originally written by Timothy Rule and reworked &
bug fixed by myself
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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