1 // SPDX-License-Identifier: GPL-2.0-only
3 * Remote processor messaging transport (OMAP platform-specific bits)
5 * Copyright (C) 2011 Texas Instruments, Inc.
6 * Copyright (C) 2011 Google, Inc.
8 * Ohad Ben-Cohen <ohad@wizery.com>
9 * Brian Swetland <swetland@google.com>
12 #include <linux/dma-map-ops.h>
13 #include <linux/export.h>
14 #include <linux/of_reserved_mem.h>
15 #include <linux/remoteproc.h>
16 #include <linux/virtio.h>
17 #include <linux/virtio_config.h>
18 #include <linux/virtio_ids.h>
19 #include <linux/virtio_ring.h>
20 #include <linux/err.h>
21 #include <linux/kref.h>
22 #include <linux/slab.h>
24 #include "remoteproc_internal.h"
26 static struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
28 return container_of(vdev->dev.parent, struct rproc_vdev, dev);
31 static struct rproc *vdev_to_rproc(struct virtio_device *vdev)
33 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
38 /* kick the remote processor, and let it know which virtqueue to poke at */
39 static bool rproc_virtio_notify(struct virtqueue *vq)
41 struct rproc_vring *rvring = vq->priv;
42 struct rproc *rproc = rvring->rvdev->rproc;
43 int notifyid = rvring->notifyid;
45 dev_dbg(&rproc->dev, "kicking vq index: %d\n", notifyid);
47 rproc->ops->kick(rproc, notifyid);
52 * rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted
53 * @rproc: handle to the remote processor
54 * @notifyid: index of the signalled virtqueue (unique per this @rproc)
56 * This function should be called by the platform-specific rproc driver,
57 * when the remote processor signals that a specific virtqueue has pending
60 * Return: IRQ_NONE if no message was found in the @notifyid virtqueue,
61 * and otherwise returns IRQ_HANDLED.
63 irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
65 struct rproc_vring *rvring;
67 dev_dbg(&rproc->dev, "vq index %d is interrupted\n", notifyid);
69 rvring = idr_find(&rproc->notifyids, notifyid);
70 if (!rvring || !rvring->vq)
73 return vring_interrupt(0, rvring->vq);
75 EXPORT_SYMBOL(rproc_vq_interrupt);
77 static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
79 void (*callback)(struct virtqueue *vq),
80 const char *name, bool ctx)
82 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
83 struct rproc *rproc = vdev_to_rproc(vdev);
84 struct device *dev = &rproc->dev;
85 struct rproc_mem_entry *mem;
86 struct rproc_vring *rvring;
87 struct fw_rsc_vdev *rsc;
92 /* we're temporarily limited to two virtqueues per rvdev */
93 if (id >= ARRAY_SIZE(rvdev->vring))
94 return ERR_PTR(-EINVAL);
99 /* Search allocated memory region by name */
100 mem = rproc_find_carveout_by_name(rproc, "vdev%dvring%d", rvdev->index,
102 if (!mem || !mem->va)
103 return ERR_PTR(-ENOMEM);
105 rvring = &rvdev->vring[id];
110 size = vring_size(num, rvring->align);
111 memset(addr, 0, size);
113 dev_dbg(dev, "vring%d: va %pK qsz %d notifyid %d\n",
114 id, addr, num, rvring->notifyid);
117 * Create the new vq, and tell virtio we're not interested in
118 * the 'weak' smp barriers, since we're talking with a real device.
120 vq = vring_new_virtqueue(id, num, rvring->align, vdev, false, ctx,
121 addr, rproc_virtio_notify, callback, name);
123 dev_err(dev, "vring_new_virtqueue %s failed\n", name);
124 rproc_free_vring(rvring);
125 return ERR_PTR(-ENOMEM);
133 /* Update vring in resource table */
134 rsc = (void *)rproc->table_ptr + rvdev->rsc_offset;
135 rsc->vring[id].da = mem->da;
140 static void __rproc_virtio_del_vqs(struct virtio_device *vdev)
142 struct virtqueue *vq, *n;
143 struct rproc_vring *rvring;
145 list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
148 vring_del_virtqueue(vq);
152 static void rproc_virtio_del_vqs(struct virtio_device *vdev)
154 __rproc_virtio_del_vqs(vdev);
157 static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
158 struct virtqueue *vqs[],
159 vq_callback_t *callbacks[],
160 const char * const names[],
163 struct irq_affinity *desc)
165 int i, ret, queue_idx = 0;
167 for (i = 0; i < nvqs; ++i) {
173 vqs[i] = rp_find_vq(vdev, queue_idx++, callbacks[i], names[i],
174 ctx ? ctx[i] : false);
175 if (IS_ERR(vqs[i])) {
176 ret = PTR_ERR(vqs[i]);
184 __rproc_virtio_del_vqs(vdev);
188 static u8 rproc_virtio_get_status(struct virtio_device *vdev)
190 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
191 struct fw_rsc_vdev *rsc;
193 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
198 static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
200 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
201 struct fw_rsc_vdev *rsc;
203 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
205 rsc->status = status;
206 dev_dbg(&vdev->dev, "status: %d\n", status);
209 static void rproc_virtio_reset(struct virtio_device *vdev)
211 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
212 struct fw_rsc_vdev *rsc;
214 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
217 dev_dbg(&vdev->dev, "reset !\n");
220 /* provide the vdev features as retrieved from the firmware */
221 static u64 rproc_virtio_get_features(struct virtio_device *vdev)
223 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
224 struct fw_rsc_vdev *rsc;
226 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
228 return rsc->dfeatures;
231 static void rproc_transport_features(struct virtio_device *vdev)
234 * Packed ring isn't enabled on remoteproc for now,
235 * because remoteproc uses vring_new_virtqueue() which
236 * creates virtio rings on preallocated memory.
238 __virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED);
241 static int rproc_virtio_finalize_features(struct virtio_device *vdev)
243 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
244 struct fw_rsc_vdev *rsc;
246 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
248 /* Give virtio_ring a chance to accept features */
249 vring_transport_features(vdev);
251 /* Give virtio_rproc a chance to accept features. */
252 rproc_transport_features(vdev);
254 /* Make sure we don't have any features > 32 bits! */
255 BUG_ON((u32)vdev->features != vdev->features);
258 * Remember the finalized features of our vdev, and provide it
259 * to the remote processor once it is powered on.
261 rsc->gfeatures = vdev->features;
266 static void rproc_virtio_get(struct virtio_device *vdev, unsigned int offset,
267 void *buf, unsigned int len)
269 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
270 struct fw_rsc_vdev *rsc;
273 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
274 cfg = &rsc->vring[rsc->num_of_vrings];
276 if (offset + len > rsc->config_len || offset + len < len) {
277 dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n");
281 memcpy(buf, cfg + offset, len);
284 static void rproc_virtio_set(struct virtio_device *vdev, unsigned int offset,
285 const void *buf, unsigned int len)
287 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
288 struct fw_rsc_vdev *rsc;
291 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
292 cfg = &rsc->vring[rsc->num_of_vrings];
294 if (offset + len > rsc->config_len || offset + len < len) {
295 dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n");
299 memcpy(cfg + offset, buf, len);
302 static const struct virtio_config_ops rproc_virtio_config_ops = {
303 .get_features = rproc_virtio_get_features,
304 .finalize_features = rproc_virtio_finalize_features,
305 .find_vqs = rproc_virtio_find_vqs,
306 .del_vqs = rproc_virtio_del_vqs,
307 .reset = rproc_virtio_reset,
308 .set_status = rproc_virtio_set_status,
309 .get_status = rproc_virtio_get_status,
310 .get = rproc_virtio_get,
311 .set = rproc_virtio_set,
315 * This function is called whenever vdev is released, and is responsible
316 * to decrement the remote processor's refcount which was taken when vdev was
319 * Never call this function directly; it will be called by the driver
322 static void rproc_virtio_dev_release(struct device *dev)
324 struct virtio_device *vdev = dev_to_virtio(dev);
325 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
326 struct rproc *rproc = vdev_to_rproc(vdev);
330 kref_put(&rvdev->refcount, rproc_vdev_release);
332 put_device(&rproc->dev);
336 * rproc_add_virtio_dev() - register an rproc-induced virtio device
337 * @rvdev: the remote vdev
338 * @id: the device type identification (used to match it with a driver).
340 * This function registers a virtio device. This vdev's partent is
343 * Return: 0 on success or an appropriate error value otherwise
345 int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
347 struct rproc *rproc = rvdev->rproc;
348 struct device *dev = &rvdev->dev;
349 struct virtio_device *vdev;
350 struct rproc_mem_entry *mem;
353 if (rproc->ops->kick == NULL) {
355 dev_err(dev, ".kick method not defined for %s\n", rproc->name);
359 /* Try to find dedicated vdev buffer carveout */
360 mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer", rvdev->index);
364 if (mem->of_resm_idx != -1) {
365 struct device_node *np = rproc->dev.parent->of_node;
367 /* Associate reserved memory to vdev device */
368 ret = of_reserved_mem_device_init_by_idx(dev, np,
371 dev_err(dev, "Can't associate reserved memory\n");
376 dev_warn(dev, "vdev %d buffer already mapped\n",
378 pa = rproc_va_to_pa(mem->va);
380 /* Use dma address as carveout no memmapped yet */
381 pa = (phys_addr_t)mem->dma;
384 /* Associate vdev buffer memory pool to vdev subdev */
385 ret = dma_declare_coherent_memory(dev, pa,
389 dev_err(dev, "Failed to associate buffer\n");
394 struct device_node *np = rproc->dev.parent->of_node;
397 * If we don't have dedicated buffer, just attempt to re-assign
398 * the reserved memory from our parent. A default memory-region
399 * at index 0 from the parent's memory-regions is assigned for
400 * the rvdev dev to allocate from. Failure is non-critical and
401 * the allocations will fall back to global pools, so don't
402 * check return value either.
404 of_reserved_mem_device_init_by_idx(dev, np, 0);
407 /* Allocate virtio device */
408 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
413 vdev->id.device = id,
414 vdev->config = &rproc_virtio_config_ops,
415 vdev->dev.parent = dev;
416 vdev->dev.release = rproc_virtio_dev_release;
419 * We're indirectly making a non-temporary copy of the rproc pointer
420 * here, because drivers probed with this vdev will indirectly
421 * access the wrapping rproc.
423 * Therefore we must increment the rproc refcount here, and decrement
424 * it _only_ when the vdev is released.
426 get_device(&rproc->dev);
428 /* Reference the vdev and vring allocations */
429 kref_get(&rvdev->refcount);
431 ret = register_virtio_device(vdev);
433 put_device(&vdev->dev);
434 dev_err(dev, "failed to register vdev: %d\n", ret);
438 dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
445 * rproc_remove_virtio_dev() - remove an rproc-induced virtio device
446 * @dev: the virtio device
447 * @data: must be null
449 * This function unregisters an existing virtio device.
453 int rproc_remove_virtio_dev(struct device *dev, void *data)
455 struct virtio_device *vdev = dev_to_virtio(dev);
457 unregister_virtio_device(vdev);