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![Sjur Brændeland](/assets/img/avatar_default.png)
Support virtio configuration space and device status. The virtio device can now access the resource table in shared memory. Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com> Acked-by: Ido Yariv <ido@wizery.com> [rebase and style changes] Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
357 lines
9.2 KiB
C
357 lines
9.2 KiB
C
/*
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* Remote processor messaging transport (OMAP platform-specific bits)
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Brian Swetland <swetland@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/export.h>
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#include <linux/remoteproc.h>
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#include <linux/virtio.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_ring.h>
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#include <linux/err.h>
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#include <linux/kref.h>
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#include <linux/slab.h>
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#include "remoteproc_internal.h"
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/* kick the remote processor, and let it know which virtqueue to poke at */
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static void rproc_virtio_notify(struct virtqueue *vq)
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{
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struct rproc_vring *rvring = vq->priv;
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struct rproc *rproc = rvring->rvdev->rproc;
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int notifyid = rvring->notifyid;
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dev_dbg(&rproc->dev, "kicking vq index: %d\n", notifyid);
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rproc->ops->kick(rproc, notifyid);
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}
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/**
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* rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted
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* @rproc: handle to the remote processor
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* @notifyid: index of the signalled virtqueue (unique per this @rproc)
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*
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* This function should be called by the platform-specific rproc driver,
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* when the remote processor signals that a specific virtqueue has pending
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* messages available.
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*
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* Returns IRQ_NONE if no message was found in the @notifyid virtqueue,
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* and otherwise returns IRQ_HANDLED.
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*/
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irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
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{
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struct rproc_vring *rvring;
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dev_dbg(&rproc->dev, "vq index %d is interrupted\n", notifyid);
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rvring = idr_find(&rproc->notifyids, notifyid);
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if (!rvring || !rvring->vq)
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return IRQ_NONE;
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return vring_interrupt(0, rvring->vq);
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}
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EXPORT_SYMBOL(rproc_vq_interrupt);
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static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
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unsigned id,
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void (*callback)(struct virtqueue *vq),
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const char *name)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct rproc *rproc = vdev_to_rproc(vdev);
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struct device *dev = &rproc->dev;
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struct rproc_vring *rvring;
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struct virtqueue *vq;
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void *addr;
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int len, size, ret;
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/* we're temporarily limited to two virtqueues per rvdev */
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if (id >= ARRAY_SIZE(rvdev->vring))
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return ERR_PTR(-EINVAL);
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if (!name)
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return NULL;
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ret = rproc_alloc_vring(rvdev, id);
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if (ret)
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return ERR_PTR(ret);
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rvring = &rvdev->vring[id];
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addr = rvring->va;
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len = rvring->len;
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/* zero vring */
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size = vring_size(len, rvring->align);
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memset(addr, 0, size);
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dev_dbg(dev, "vring%d: va %p qsz %d notifyid %d\n",
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id, addr, len, rvring->notifyid);
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/*
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* Create the new vq, and tell virtio we're not interested in
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* the 'weak' smp barriers, since we're talking with a real device.
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*/
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vq = vring_new_virtqueue(id, len, rvring->align, vdev, false, addr,
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rproc_virtio_notify, callback, name);
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if (!vq) {
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dev_err(dev, "vring_new_virtqueue %s failed\n", name);
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rproc_free_vring(rvring);
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return ERR_PTR(-ENOMEM);
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}
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rvring->vq = vq;
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vq->priv = rvring;
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return vq;
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}
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static void __rproc_virtio_del_vqs(struct virtio_device *vdev)
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{
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struct virtqueue *vq, *n;
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struct rproc_vring *rvring;
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list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
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rvring = vq->priv;
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rvring->vq = NULL;
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vring_del_virtqueue(vq);
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rproc_free_vring(rvring);
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}
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}
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static void rproc_virtio_del_vqs(struct virtio_device *vdev)
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{
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struct rproc *rproc = vdev_to_rproc(vdev);
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/* power down the remote processor before deleting vqs */
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rproc_shutdown(rproc);
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__rproc_virtio_del_vqs(vdev);
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}
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static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[],
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vq_callback_t *callbacks[],
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const char *names[])
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{
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struct rproc *rproc = vdev_to_rproc(vdev);
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int i, ret;
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for (i = 0; i < nvqs; ++i) {
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vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i]);
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if (IS_ERR(vqs[i])) {
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ret = PTR_ERR(vqs[i]);
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goto error;
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}
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}
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/* now that the vqs are all set, boot the remote processor */
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ret = rproc_boot(rproc);
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if (ret) {
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dev_err(&rproc->dev, "rproc_boot() failed %d\n", ret);
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goto error;
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}
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return 0;
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error:
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__rproc_virtio_del_vqs(vdev);
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return ret;
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}
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static u8 rproc_virtio_get_status(struct virtio_device *vdev)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct fw_rsc_vdev *rsc;
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rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
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return rsc->status;
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}
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static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct fw_rsc_vdev *rsc;
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rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
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rsc->status = status;
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dev_dbg(&vdev->dev, "status: %d\n", status);
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}
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static void rproc_virtio_reset(struct virtio_device *vdev)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct fw_rsc_vdev *rsc;
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rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
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rsc->status = 0;
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dev_dbg(&vdev->dev, "reset !\n");
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}
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/* provide the vdev features as retrieved from the firmware */
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static u32 rproc_virtio_get_features(struct virtio_device *vdev)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct fw_rsc_vdev *rsc;
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rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
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return rsc->dfeatures;
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}
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static void rproc_virtio_finalize_features(struct virtio_device *vdev)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct fw_rsc_vdev *rsc;
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rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
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/* Give virtio_ring a chance to accept features */
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vring_transport_features(vdev);
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/*
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* Remember the finalized features of our vdev, and provide it
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* to the remote processor once it is powered on.
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*/
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rsc->gfeatures = vdev->features[0];
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}
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static void rproc_virtio_get(struct virtio_device *vdev, unsigned offset,
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void *buf, unsigned len)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct fw_rsc_vdev *rsc;
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void *cfg;
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rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
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cfg = &rsc->vring[rsc->num_of_vrings];
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if (offset + len > rsc->config_len || offset + len < len) {
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dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n");
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return;
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}
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memcpy(buf, cfg + offset, len);
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}
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static void rproc_virtio_set(struct virtio_device *vdev, unsigned offset,
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const void *buf, unsigned len)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct fw_rsc_vdev *rsc;
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void *cfg;
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rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
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cfg = &rsc->vring[rsc->num_of_vrings];
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if (offset + len > rsc->config_len || offset + len < len) {
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dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n");
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return;
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}
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memcpy(cfg + offset, buf, len);
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}
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static const struct virtio_config_ops rproc_virtio_config_ops = {
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.get_features = rproc_virtio_get_features,
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.finalize_features = rproc_virtio_finalize_features,
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.find_vqs = rproc_virtio_find_vqs,
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.del_vqs = rproc_virtio_del_vqs,
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.reset = rproc_virtio_reset,
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.set_status = rproc_virtio_set_status,
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.get_status = rproc_virtio_get_status,
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.get = rproc_virtio_get,
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.set = rproc_virtio_set,
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};
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/*
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* This function is called whenever vdev is released, and is responsible
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* to decrement the remote processor's refcount which was taken when vdev was
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* added.
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*
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* Never call this function directly; it will be called by the driver
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* core when needed.
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*/
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static void rproc_vdev_release(struct device *dev)
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{
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struct virtio_device *vdev = dev_to_virtio(dev);
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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struct rproc *rproc = vdev_to_rproc(vdev);
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list_del(&rvdev->node);
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kfree(rvdev);
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put_device(&rproc->dev);
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}
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/**
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* rproc_add_virtio_dev() - register an rproc-induced virtio device
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* @rvdev: the remote vdev
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*
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* This function registers a virtio device. This vdev's partent is
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* the rproc device.
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*
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* Returns 0 on success or an appropriate error value otherwise.
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*/
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int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
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{
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struct rproc *rproc = rvdev->rproc;
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struct device *dev = &rproc->dev;
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struct virtio_device *vdev = &rvdev->vdev;
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int ret;
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vdev->id.device = id,
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vdev->config = &rproc_virtio_config_ops,
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vdev->dev.parent = dev;
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vdev->dev.release = rproc_vdev_release;
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/*
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* We're indirectly making a non-temporary copy of the rproc pointer
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* here, because drivers probed with this vdev will indirectly
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* access the wrapping rproc.
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*
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* Therefore we must increment the rproc refcount here, and decrement
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* it _only_ when the vdev is released.
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*/
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get_device(&rproc->dev);
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ret = register_virtio_device(vdev);
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if (ret) {
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put_device(&rproc->dev);
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dev_err(dev, "failed to register vdev: %d\n", ret);
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goto out;
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}
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dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
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out:
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return ret;
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}
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/**
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* rproc_remove_virtio_dev() - remove an rproc-induced virtio device
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* @rvdev: the remote vdev
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*
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* This function unregisters an existing virtio device.
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*/
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void rproc_remove_virtio_dev(struct rproc_vdev *rvdev)
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{
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unregister_virtio_device(&rvdev->vdev);
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}
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