[linux-2.6-block.git] / drivers / remoteproc / remoteproc_virtio.c

/*
 * Remote processor messaging transport (OMAP platform-specific bits)
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Copyright (C) 2011 Google, Inc.
 *
 * Ohad Ben-Cohen <ohad@wizery.com>
 * Brian Swetland <swetland@google.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <linux/of_reserved_mem.h>
#include <linux/remoteproc.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_ring.h>
#include <linux/err.h>
#include <linux/kref.h>
#include <linux/slab.h>

#include "remoteproc_internal.h"

/* kick the remote processor, and let it know which virtqueue to poke at */
static bool rproc_virtio_notify(struct virtqueue *vq)
{
	struct rproc_vring *rvring = vq->priv;
	struct rproc *rproc = rvring->rvdev->rproc;
	int notifyid = rvring->notifyid;

	dev_dbg(&rproc->dev, "kicking vq index: %d\n", notifyid);

	rproc->ops->kick(rproc, notifyid);
	return true;
}

/**
 * rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted
 * @rproc: handle to the remote processor
 * @notifyid: index of the signalled virtqueue (unique per this @rproc)
 *
 * This function should be called by the platform-specific rproc driver,
 * when the remote processor signals that a specific virtqueue has pending
 * messages available.
 *
 * Returns IRQ_NONE if no message was found in the @notifyid virtqueue,
 * and otherwise returns IRQ_HANDLED.
 */
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
{
	struct rproc_vring *rvring;

	dev_dbg(&rproc->dev, "vq index %d is interrupted\n", notifyid);

	rvring = idr_find(&rproc->notifyids, notifyid);
	if (!rvring || !rvring->vq)
		return IRQ_NONE;

	return vring_interrupt(0, rvring->vq);
}
EXPORT_SYMBOL(rproc_vq_interrupt);

static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
				    unsigned int id,
				    void (*callback)(struct virtqueue *vq),
				    const char *name, bool ctx)
{
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct rproc *rproc = vdev_to_rproc(vdev);
	struct device *dev = &rproc->dev;
	struct rproc_mem_entry *mem;
	struct rproc_vring *rvring;
	struct fw_rsc_vdev *rsc;
	struct virtqueue *vq;
	void *addr;
	int len, size;

	/* we're temporarily limited to two virtqueues per rvdev */
	if (id >= ARRAY_SIZE(rvdev->vring))
		return ERR_PTR(-EINVAL);

	if (!name)
		return NULL;

	/* Search allocated memory region by name */
	mem = rproc_find_carveout_by_name(rproc, "vdev%dvring%d", rvdev->index,
					  id);
	if (!mem || !mem->va)
		return ERR_PTR(-ENOMEM);

	rvring = &rvdev->vring[id];
	addr = mem->va;
	len = rvring->len;

	/* zero vring */
	size = vring_size(len, rvring->align);
	memset(addr, 0, size);

	dev_dbg(dev, "vring%d: va %pK qsz %d notifyid %d\n",
		id, addr, len, rvring->notifyid);

	/*
	 * Create the new vq, and tell virtio we're not interested in
	 * the 'weak' smp barriers, since we're talking with a real device.
	 */
	vq = vring_new_virtqueue(id, len, rvring->align, vdev, false, ctx,
				 addr, rproc_virtio_notify, callback, name);
	if (!vq) {
		dev_err(dev, "vring_new_virtqueue %s failed\n", name);
		rproc_free_vring(rvring);
		return ERR_PTR(-ENOMEM);
	}

	rvring->vq = vq;
	vq->priv = rvring;

	/* Update vring in resource table */
	rsc = (void *)rproc->table_ptr + rvdev->rsc_offset;
	rsc->vring[id].da = mem->da;

	return vq;
}

static void __rproc_virtio_del_vqs(struct virtio_device *vdev)
{
	struct virtqueue *vq, *n;
	struct rproc_vring *rvring;

	list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
		rvring = vq->priv;
		rvring->vq = NULL;
		vring_del_virtqueue(vq);
	}
}

static void rproc_virtio_del_vqs(struct virtio_device *vdev)
{
	__rproc_virtio_del_vqs(vdev);
}

static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
				 struct virtqueue *vqs[],
				 vq_callback_t *callbacks[],
				 const char * const names[],
				 const bool * ctx,
				 struct irq_affinity *desc)
{
	int i, ret, queue_idx = 0;

	for (i = 0; i < nvqs; ++i) {
		if (!names[i]) {
			vqs[i] = NULL;
			continue;
		}

		vqs[i] = rp_find_vq(vdev, queue_idx++, callbacks[i], names[i],
				    ctx ? ctx[i] : false);
		if (IS_ERR(vqs[i])) {
			ret = PTR_ERR(vqs[i]);
			goto error;
		}
	}

	return 0;

error:
	__rproc_virtio_del_vqs(vdev);
	return ret;
}

static u8 rproc_virtio_get_status(struct virtio_device *vdev)
{
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct fw_rsc_vdev *rsc;

	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;

	return rsc->status;
}

static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
{
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct fw_rsc_vdev *rsc;

	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;

	rsc->status = status;
	dev_dbg(&vdev->dev, "status: %d\n", status);
}

static void rproc_virtio_reset(struct virtio_device *vdev)
{
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct fw_rsc_vdev *rsc;

	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;

	rsc->status = 0;
	dev_dbg(&vdev->dev, "reset !\n");
}

/* provide the vdev features as retrieved from the firmware */
static u64 rproc_virtio_get_features(struct virtio_device *vdev)
{
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct fw_rsc_vdev *rsc;

	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;

	return rsc->dfeatures;
}

static void rproc_transport_features(struct virtio_device *vdev)
{
	/*
	 * Packed ring isn't enabled on remoteproc for now,
	 * because remoteproc uses vring_new_virtqueue() which
	 * creates virtio rings on preallocated memory.
	 */
	__virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED);
}

static int rproc_virtio_finalize_features(struct virtio_device *vdev)
{
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct fw_rsc_vdev *rsc;

	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;

	/* Give virtio_ring a chance to accept features */
	vring_transport_features(vdev);

	/* Give virtio_rproc a chance to accept features. */
	rproc_transport_features(vdev);

	/* Make sure we don't have any features > 32 bits! */
	BUG_ON((u32)vdev->features != vdev->features);

	/*
	 * Remember the finalized features of our vdev, and provide it
	 * to the remote processor once it is powered on.
	 */
	rsc->gfeatures = vdev->features;

	return 0;
}

static void rproc_virtio_get(struct virtio_device *vdev, unsigned int offset,
			     void *buf, unsigned int len)
{
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct fw_rsc_vdev *rsc;
	void *cfg;

	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
	cfg = &rsc->vring[rsc->num_of_vrings];

	if (offset + len > rsc->config_len || offset + len < len) {
		dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n");
		return;
	}

	memcpy(buf, cfg + offset, len);
}

static void rproc_virtio_set(struct virtio_device *vdev, unsigned int offset,
			     const void *buf, unsigned int len)
{
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct fw_rsc_vdev *rsc;
	void *cfg;

	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
	cfg = &rsc->vring[rsc->num_of_vrings];

	if (offset + len > rsc->config_len || offset + len < len) {
		dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n");
		return;
	}

	memcpy(cfg + offset, buf, len);
}

static const struct virtio_config_ops rproc_virtio_config_ops = {
	.get_features	= rproc_virtio_get_features,
	.finalize_features = rproc_virtio_finalize_features,
	.find_vqs	= rproc_virtio_find_vqs,
	.del_vqs	= rproc_virtio_del_vqs,
	.reset		= rproc_virtio_reset,
	.set_status	= rproc_virtio_set_status,
	.get_status	= rproc_virtio_get_status,
	.get		= rproc_virtio_get,
	.set		= rproc_virtio_set,
};

/*
 * This function is called whenever vdev is released, and is responsible
 * to decrement the remote processor's refcount which was taken when vdev was
 * added.
 *
 * Never call this function directly; it will be called by the driver
 * core when needed.
 */
static void rproc_virtio_dev_release(struct device *dev)
{
	struct virtio_device *vdev = dev_to_virtio(dev);
	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	struct rproc *rproc = vdev_to_rproc(vdev);

	kfree(vdev);

	kref_put(&rvdev->refcount, rproc_vdev_release);

	put_device(&rproc->dev);
}

/**
 * rproc_add_virtio_dev() - register an rproc-induced virtio device
 * @rvdev: the remote vdev
 *
 * This function registers a virtio device. This vdev's partent is
 * the rproc device.
 *
 * Returns 0 on success or an appropriate error value otherwise.
 */
int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
{
	struct rproc *rproc = rvdev->rproc;
	struct device *dev = &rvdev->dev;
	struct virtio_device *vdev;
	struct rproc_mem_entry *mem;
	int ret;

	/* Try to find dedicated vdev buffer carveout */
	mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer", rvdev->index);
	if (mem) {
		phys_addr_t pa;

		if (mem->of_resm_idx != -1) {
			struct device_node *np = rproc->dev.parent->of_node;

			/* Associate reserved memory to vdev device */
			ret = of_reserved_mem_device_init_by_idx(dev, np,
								 mem->of_resm_idx);
			if (ret) {
				dev_err(dev, "Can't associate reserved memory\n");
				goto out;
			}
		} else {
			if (mem->va) {
				dev_warn(dev, "vdev %d buffer already mapped\n",
					 rvdev->index);
				pa = rproc_va_to_pa(mem->va);
			} else {
				/* Use dma address as carveout no memmapped yet */
				pa = (phys_addr_t)mem->dma;
			}

			/* Associate vdev buffer memory pool to vdev subdev */
			ret = dma_declare_coherent_memory(dev, pa,
							   mem->da,
							   mem->len);
			if (ret < 0) {
				dev_err(dev, "Failed to associate buffer\n");
				goto out;
			}
		}
	}

	/* Allocate virtio device */
	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	if (!vdev) {
		ret = -ENOMEM;
		goto out;
	}
	vdev->id.device	= id,
	vdev->config = &rproc_virtio_config_ops,
	vdev->dev.parent = dev;
	vdev->dev.release = rproc_virtio_dev_release;

	/*
	 * We're indirectly making a non-temporary copy of the rproc pointer
	 * here, because drivers probed with this vdev will indirectly
	 * access the wrapping rproc.
	 *
	 * Therefore we must increment the rproc refcount here, and decrement
	 * it _only_ when the vdev is released.
	 */
	get_device(&rproc->dev);

	/* Reference the vdev and vring allocations */
	kref_get(&rvdev->refcount);

	ret = register_virtio_device(vdev);
	if (ret) {
		put_device(&vdev->dev);
		dev_err(dev, "failed to register vdev: %d\n", ret);
		goto out;
	}

	dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);

out:
	return ret;
}

/**
 * rproc_remove_virtio_dev() - remove an rproc-induced virtio device
 * @dev: the virtio device
 * @data: must be null
 *
 * This function unregisters an existing virtio device.
 */
int rproc_remove_virtio_dev(struct device *dev, void *data)
{
	struct virtio_device *vdev = dev_to_virtio(dev);

	unregister_virtio_device(vdev);
	return 0;
}
Commit	Line	Data
ac8954a4 OBC	1	/*
	2	* Remote processor messaging transport (OMAP platform-specific bits)
	3	*
	4	* Copyright (C) 2011 Texas Instruments, Inc.
	5	* Copyright (C) 2011 Google, Inc.
	6	*
	7	* Ohad Ben-Cohen <ohad@wizery.com>
	8	* Brian Swetland <swetland@google.com>
	9	*
	10	* This software is licensed under the terms of the GNU General Public
	11	* License version 2, as published by the Free Software Foundation, and
	12	* may be copied, distributed, and modified under those terms.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*/
	19
086d0872	20	#include <linux/dma-mapping.h>
ac8954a4	21	#include <linux/export.h>
086d0872	22	#include <linux/of_reserved_mem.h>
ac8954a4	23	#include <linux/remoteproc.h>
ac8954a4 OBC	24	#include <linux/virtio.h>
	25	#include <linux/virtio_config.h>
	26	#include <linux/virtio_ids.h>
	27	#include <linux/virtio_ring.h>
	28	#include <linux/err.h>
	29	#include <linux/kref.h>
	30	#include <linux/slab.h>
	31
	32	#include "remoteproc_internal.h"
	33
ac8954a4	34	/* kick the remote processor, and let it know which virtqueue to poke at */
46f9c2b9	35	static bool rproc_virtio_notify(struct virtqueue *vq)
ac8954a4	36	{
7a186941 OBC	37	struct rproc_vring *rvring = vq->priv;
	38	struct rproc *rproc = rvring->rvdev->rproc;
	39	int notifyid = rvring->notifyid;
ac8954a4	40
b5ab5e24	41	dev_dbg(&rproc->dev, "kicking vq index: %d\n", notifyid);
ac8954a4	42
7a186941	43	rproc->ops->kick(rproc, notifyid);
46f9c2b9	44	return true;
ac8954a4 OBC	45	}
	46
	47	/**
	48	* rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted
	49	* @rproc: handle to the remote processor
7a186941	50	* @notifyid: index of the signalled virtqueue (unique per this @rproc)
ac8954a4 OBC	51	*
	52	* This function should be called by the platform-specific rproc driver,
	53	* when the remote processor signals that a specific virtqueue has pending
	54	* messages available.
	55	*
7a186941	56	* Returns IRQ_NONE if no message was found in the @notifyid virtqueue,
ac8954a4 OBC	57	* and otherwise returns IRQ_HANDLED.
ac8954a4 OBC	58	*/
7a186941	59	irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
ac8954a4	60	{
7a186941 OBC	61	struct rproc_vring *rvring;
7a186941 OBC	62
b5ab5e24	63	dev_dbg(&rproc->dev, "vq index %d is interrupted\n", notifyid);
7a186941 OBC	64
	65	rvring = idr_find(&rproc->notifyids, notifyid);
	66	if (!rvring \|\| !rvring->vq)
	67	return IRQ_NONE;
	68
	69	return vring_interrupt(0, rvring->vq);
ac8954a4 OBC	70	}
	71	EXPORT_SYMBOL(rproc_vq_interrupt);
	72
	73	static struct virtqueue rp_find_vq(struct virtio_device vdev,
f145928d	74	unsigned int id,
ac8954a4	75	void (callback)(struct virtqueue vq),
f94682dd	76	const char *name, bool ctx)
ac8954a4	77	{
7a186941	78	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
ac8954a4	79	struct rproc *rproc = vdev_to_rproc(vdev);
b5ab5e24	80	struct device *dev = &rproc->dev;
c6aed238	81	struct rproc_mem_entry *mem;
7a186941	82	struct rproc_vring *rvring;
c6aed238	83	struct fw_rsc_vdev *rsc;
ac8954a4 OBC	84	struct virtqueue *vq;
ac8954a4 OBC	85	void *addr;
a863af5d	86	int len, size;
ac8954a4	87
7a186941 OBC	88	/* we're temporarily limited to two virtqueues per rvdev */
	89	if (id >= ARRAY_SIZE(rvdev->vring))
	90	return ERR_PTR(-EINVAL);
	91
6457f126 MT	92	if (!name)
	93	return NULL;
	94
c6aed238 LP	95	/* Search allocated memory region by name */
	96	mem = rproc_find_carveout_by_name(rproc, "vdev%dvring%d", rvdev->index,
	97	id);
	98	if (!mem \|\| !mem->va)
	99	return ERR_PTR(-ENOMEM);
	100
6db20ea8	101	rvring = &rvdev->vring[id];
c6aed238	102	addr = mem->va;
7a186941	103	len = rvring->len;
ac8954a4	104
7a186941 OBC	105	/* zero vring */
	106	size = vring_size(len, rvring->align);
	107	memset(addr, 0, size);
ac8954a4	108
276ec993	109	dev_dbg(dev, "vring%d: va %pK qsz %d notifyid %d\n",
730f84ce	110	id, addr, len, rvring->notifyid);
ac8954a4	111
dd6da1c5 OBC	112	/*
	113	* Create the new vq, and tell virtio we're not interested in
	114	* the 'weak' smp barriers, since we're talking with a real device.
	115	*/
f94682dd MT	116	vq = vring_new_virtqueue(id, len, rvring->align, vdev, false, ctx,
f94682dd MT	117	addr, rproc_virtio_notify, callback, name);
ac8954a4	118	if (!vq) {
b5ab5e24	119	dev_err(dev, "vring_new_virtqueue %s failed\n", name);
6db20ea8	120	rproc_free_vring(rvring);
7a186941	121	return ERR_PTR(-ENOMEM);
ac8954a4 OBC	122	}
ac8954a4 OBC	123
7a186941 OBC	124	rvring->vq = vq;
7a186941 OBC	125	vq->priv = rvring;
ac8954a4	126
c6aed238 LP	127	/* Update vring in resource table */
	128	rsc = (void *)rproc->table_ptr + rvdev->rsc_offset;
	129	rsc->vring[id].da = mem->da;
	130
ac8954a4	131	return vq;
ac8954a4 OBC	132	}
ac8954a4 OBC	133
dab55bba	134	static void __rproc_virtio_del_vqs(struct virtio_device *vdev)
ac8954a4 OBC	135	{
ac8954a4 OBC	136	struct virtqueue vq, n;
7a186941	137	struct rproc_vring *rvring;
ac8954a4 OBC	138
ac8954a4 OBC	139	list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
7a186941 OBC	140	rvring = vq->priv;
7a186941 OBC	141	rvring->vq = NULL;
ac8954a4	142	vring_del_virtqueue(vq);
ac8954a4	143	}
ac8954a4 OBC	144	}
ac8954a4 OBC	145
dab55bba OBC	146	static void rproc_virtio_del_vqs(struct virtio_device *vdev)
dab55bba OBC	147	{
dab55bba OBC	148	__rproc_virtio_del_vqs(vdev);
	149	}
	150
f145928d	151	static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
730f84ce AS	152	struct virtqueue *vqs[],
730f84ce AS	153	vq_callback_t *callbacks[],
fb5e31d9	154	const char * const names[],
f94682dd	155	const bool * ctx,
fb5e31d9	156	struct irq_affinity *desc)
ac8954a4	157	{
a229989d	158	int i, ret, queue_idx = 0;
ac8954a4	159
ac8954a4	160	for (i = 0; i < nvqs; ++i) {
a229989d WW	161	if (!names[i]) {
	162	vqs[i] = NULL;
	163	continue;
	164	}
	165
	166	vqs[i] = rp_find_vq(vdev, queue_idx++, callbacks[i], names[i],
f94682dd	167	ctx ? ctx[i] : false);
ac8954a4 OBC	168	if (IS_ERR(vqs[i])) {
	169	ret = PTR_ERR(vqs[i]);
	170	goto error;
	171	}
	172	}
	173
	174	return 0;
	175
	176	error:
dab55bba	177	__rproc_virtio_del_vqs(vdev);
ac8954a4 OBC	178	return ret;
	179	}
	180
ac8954a4 OBC	181	static u8 rproc_virtio_get_status(struct virtio_device *vdev)
ac8954a4 OBC	182	{
92b38f85 SB	183	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	184	struct fw_rsc_vdev *rsc;
	185
	186	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
	187
	188	return rsc->status;
ac8954a4 OBC	189	}
	190
	191	static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
	192	{
92b38f85 SB	193	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	194	struct fw_rsc_vdev *rsc;
	195
	196	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
	197
	198	rsc->status = status;
7a186941	199	dev_dbg(&vdev->dev, "status: %d\n", status);
ac8954a4 OBC	200	}
	201
	202	static void rproc_virtio_reset(struct virtio_device *vdev)
	203	{
92b38f85 SB	204	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	205	struct fw_rsc_vdev *rsc;
	206
	207	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
	208
	209	rsc->status = 0;
ac8954a4 OBC	210	dev_dbg(&vdev->dev, "reset !\n");
	211	}
	212
	213	/* provide the vdev features as retrieved from the firmware */
d0254773	214	static u64 rproc_virtio_get_features(struct virtio_device *vdev)
ac8954a4	215	{
7a186941	216	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
92b38f85 SB	217	struct fw_rsc_vdev *rsc;
	218
	219	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
ac8954a4	220
92b38f85	221	return rsc->dfeatures;
ac8954a4 OBC	222	}
ac8954a4 OBC	223
3a814fdf TB	224	static void rproc_transport_features(struct virtio_device *vdev)
	225	{
	226	/*
	227	* Packed ring isn't enabled on remoteproc for now,
	228	* because remoteproc uses vring_new_virtqueue() which
	229	* creates virtio rings on preallocated memory.
	230	*/
	231	__virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED);
	232	}
	233
5c609a5e	234	static int rproc_virtio_finalize_features(struct virtio_device *vdev)
ac8954a4	235	{
7a186941	236	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
92b38f85 SB	237	struct fw_rsc_vdev *rsc;
	238
	239	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
ac8954a4 OBC	240
	241	/* Give virtio_ring a chance to accept features */
	242	vring_transport_features(vdev);
	243
3a814fdf TB	244	/* Give virtio_rproc a chance to accept features. */
	245	rproc_transport_features(vdev);
	246
93d389f8 MT	247	/* Make sure we don't have any features > 32 bits! */
	248	BUG_ON((u32)vdev->features != vdev->features);
	249
ac8954a4 OBC	250	/*
	251	* Remember the finalized features of our vdev, and provide it
	252	* to the remote processor once it is powered on.
ac8954a4	253	*/
e16e12be	254	rsc->gfeatures = vdev->features;
5c609a5e MT	255
5c609a5e MT	256	return 0;
92b38f85 SB	257	}
92b38f85 SB	258
f145928d AS	259	static void rproc_virtio_get(struct virtio_device *vdev, unsigned int offset,
f145928d AS	260	void *buf, unsigned int len)
92b38f85 SB	261	{
	262	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	263	struct fw_rsc_vdev *rsc;
	264	void *cfg;
	265
	266	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
	267	cfg = &rsc->vring[rsc->num_of_vrings];
	268
	269	if (offset + len > rsc->config_len \|\| offset + len < len) {
	270	dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n");
	271	return;
	272	}
	273
	274	memcpy(buf, cfg + offset, len);
	275	}
	276
f145928d AS	277	static void rproc_virtio_set(struct virtio_device *vdev, unsigned int offset,
f145928d AS	278	const void *buf, unsigned int len)
92b38f85 SB	279	{
	280	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
	281	struct fw_rsc_vdev *rsc;
	282	void *cfg;
	283
	284	rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
	285	cfg = &rsc->vring[rsc->num_of_vrings];
	286
	287	if (offset + len > rsc->config_len \|\| offset + len < len) {
	288	dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n");
	289	return;
	290	}
	291
	292	memcpy(cfg + offset, buf, len);
ac8954a4 OBC	293	}
ac8954a4 OBC	294
93503932	295	static const struct virtio_config_ops rproc_virtio_config_ops = {
ac8954a4 OBC	296	.get_features = rproc_virtio_get_features,
	297	.finalize_features = rproc_virtio_finalize_features,
	298	.find_vqs = rproc_virtio_find_vqs,
	299	.del_vqs = rproc_virtio_del_vqs,
	300	.reset = rproc_virtio_reset,
	301	.set_status = rproc_virtio_set_status,
	302	.get_status = rproc_virtio_get_status,
92b38f85 SB	303	.get = rproc_virtio_get,
92b38f85 SB	304	.set = rproc_virtio_set,
ac8954a4 OBC	305	};
	306
	307	/*
	308	* This function is called whenever vdev is released, and is responsible
7183a2a7	309	* to decrement the remote processor's refcount which was taken when vdev was
ac8954a4 OBC	310	* added.
	311	*
	312	* Never call this function directly; it will be called by the driver
	313	* core when needed.
	314	*/
aab8d802	315	static void rproc_virtio_dev_release(struct device *dev)
ac8954a4 OBC	316	{
ac8954a4 OBC	317	struct virtio_device *vdev = dev_to_virtio(dev);
6db20ea8	318	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
ac8954a4 OBC	319	struct rproc *rproc = vdev_to_rproc(vdev);
ac8954a4 OBC	320
d4c036fe LP	321	kfree(vdev);
d4c036fe LP	322
aab8d802	323	kref_put(&rvdev->refcount, rproc_vdev_release);
6db20ea8	324
7183a2a7	325	put_device(&rproc->dev);
ac8954a4 OBC	326	}
	327
	328	/**
7a186941 OBC	329	* rproc_add_virtio_dev() - register an rproc-induced virtio device
7a186941 OBC	330	* @rvdev: the remote vdev
ac8954a4	331	*
7a186941 OBC	332	* This function registers a virtio device. This vdev's partent is
7a186941 OBC	333	* the rproc device.
ac8954a4	334	*
7a186941	335	* Returns 0 on success or an appropriate error value otherwise.
ac8954a4	336	*/
7a186941	337	int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
ac8954a4	338	{
7a186941	339	struct rproc *rproc = rvdev->rproc;
086d0872	340	struct device *dev = &rvdev->dev;
d4c036fe	341	struct virtio_device *vdev;
086d0872	342	struct rproc_mem_entry *mem;
ac8954a4 OBC	343	int ret;
ac8954a4 OBC	344
086d0872 LP	345	/* Try to find dedicated vdev buffer carveout */
	346	mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer", rvdev->index);
	347	if (mem) {
	348	phys_addr_t pa;
	349
	350	if (mem->of_resm_idx != -1) {
	351	struct device_node *np = rproc->dev.parent->of_node;
	352
	353	/* Associate reserved memory to vdev device */
	354	ret = of_reserved_mem_device_init_by_idx(dev, np,
	355	mem->of_resm_idx);
	356	if (ret) {
	357	dev_err(dev, "Can't associate reserved memory\n");
	358	goto out;
	359	}
	360	} else {
	361	if (mem->va) {
	362	dev_warn(dev, "vdev %d buffer already mapped\n",
	363	rvdev->index);
	364	pa = rproc_va_to_pa(mem->va);
	365	} else {
	366	/* Use dma address as carveout no memmapped yet */
	367	pa = (phys_addr_t)mem->dma;
	368	}
	369
	370	/* Associate vdev buffer memory pool to vdev subdev */
	371	ret = dma_declare_coherent_memory(dev, pa,
	372	mem->da,
d664ce75	373	mem->len);
086d0872 LP	374	if (ret < 0) {
	375	dev_err(dev, "Failed to associate buffer\n");
	376	goto out;
	377	}
	378	}
	379	}
	380
d4c036fe LP	381	/* Allocate virtio device */
	382	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	383	if (!vdev) {
	384	ret = -ENOMEM;
	385	goto out;
	386	}
7a186941 OBC	387	vdev->id.device = id,
	388	vdev->config = &rproc_virtio_config_ops,
	389	vdev->dev.parent = dev;
aab8d802	390	vdev->dev.release = rproc_virtio_dev_release;
ac8954a4 OBC	391
	392	/*
	393	* We're indirectly making a non-temporary copy of the rproc pointer
	394	* here, because drivers probed with this vdev will indirectly
	395	* access the wrapping rproc.
	396	*
	397	* Therefore we must increment the rproc refcount here, and decrement
	398	* it _only_ when the vdev is released.
	399	*/
7183a2a7	400	get_device(&rproc->dev);
ac8954a4	401
aab8d802 BA	402	/* Reference the vdev and vring allocations */
	403	kref_get(&rvdev->refcount);
	404
7a186941	405	ret = register_virtio_device(vdev);
ac8954a4	406	if (ret) {
900a163e	407	put_device(&vdev->dev);
ac8954a4	408	dev_err(dev, "failed to register vdev: %d\n", ret);
7a186941	409	goto out;
ac8954a4 OBC	410	}
ac8954a4 OBC	411
7a186941 OBC	412	dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
	413
	414	out:
ac8954a4 OBC	415	return ret;
	416	}
	417
	418	/**
7a186941	419	* rproc_remove_virtio_dev() - remove an rproc-induced virtio device
d4c036fe LP	420	* @dev: the virtio device
d4c036fe LP	421	* @data: must be null
ac8954a4	422	*
7a186941	423	* This function unregisters an existing virtio device.
ac8954a4	424	*/
d4c036fe	425	int rproc_remove_virtio_dev(struct device dev, void data)
ac8954a4	426	{
d4c036fe LP	427	struct virtio_device *vdev = dev_to_virtio(dev);
	428
	429	unregister_virtio_device(vdev);
	430	return 0;
ac8954a4	431	}