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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/remoteproc/remoteproc_virtio.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/remoteproc/remoteproc_virtio.c')
-rw-r--r--drivers/remoteproc/remoteproc_virtio.c601
1 files changed, 601 insertions, 0 deletions
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
new file mode 100644
index 0000000000..83d76915a6
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -0,0 +1,601 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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>
+ */
+
+#include <linux/dma-direct.h>
+#include <linux/dma-map-ops.h>
+#include <linux/dma-mapping.h>
+#include <linux/export.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.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"
+
+static int copy_dma_range_map(struct device *to, struct device *from)
+{
+ const struct bus_dma_region *map = from->dma_range_map, *new_map, *r;
+ int num_ranges = 0;
+
+ if (!map)
+ return 0;
+
+ for (r = map; r->size; r++)
+ num_ranges++;
+
+ new_map = kmemdup(map, array_size(num_ranges + 1, sizeof(*map)),
+ GFP_KERNEL);
+ if (!new_map)
+ return -ENOMEM;
+ to->dma_range_map = new_map;
+ return 0;
+}
+
+static struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
+{
+ struct platform_device *pdev;
+
+ pdev = container_of(vdev->dev.parent, struct platform_device, dev);
+
+ return platform_get_drvdata(pdev);
+}
+
+static struct rproc *vdev_to_rproc(struct virtio_device *vdev)
+{
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+
+ return rvdev->rproc;
+}
+
+/* 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.
+ *
+ * Return: 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 num, 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;
+ num = rvring->num;
+
+ /* zero vring */
+ size = vring_size(num, rvring->align);
+ memset(addr, 0, size);
+
+ dev_dbg(dev, "vring%d: va %pK qsz %d notifyid %d\n",
+ id, addr, num, 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, num, 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);
+ }
+
+ vq->num_max = num;
+
+ 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);
+
+ kfree(vdev);
+
+ put_device(&rvdev->pdev->dev);
+}
+
+/**
+ * rproc_add_virtio_dev() - register an rproc-induced virtio device
+ * @rvdev: the remote vdev
+ * @id: the device type identification (used to match it with a driver).
+ *
+ * This function registers a virtio device. This vdev's partent is
+ * the rproc device.
+ *
+ * Return: 0 on success or an appropriate error value otherwise
+ */
+static int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
+{
+ struct rproc *rproc = rvdev->rproc;
+ struct device *dev = &rvdev->pdev->dev;
+ struct virtio_device *vdev;
+ struct rproc_mem_entry *mem;
+ int ret;
+
+ if (rproc->ops->kick == NULL) {
+ ret = -EINVAL;
+ dev_err(dev, ".kick method not defined for %s\n", rproc->name);
+ goto out;
+ }
+
+ /* 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;
+ }
+ }
+ } else {
+ struct device_node *np = rproc->dev.parent->of_node;
+
+ /*
+ * If we don't have dedicated buffer, just attempt to re-assign
+ * the reserved memory from our parent. A default memory-region
+ * at index 0 from the parent's memory-regions is assigned for
+ * the rvdev dev to allocate from. Failure is non-critical and
+ * the allocations will fall back to global pools, so don't
+ * check return value either.
+ */
+ of_reserved_mem_device_init_by_idx(dev, np, 0);
+ }
+
+ /* 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;
+
+ /* Reference the vdev and vring allocations */
+ get_device(dev);
+
+ 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.
+ *
+ * Return: 0
+ */
+static int rproc_remove_virtio_dev(struct device *dev, void *data)
+{
+ struct virtio_device *vdev = dev_to_virtio(dev);
+
+ unregister_virtio_device(vdev);
+ return 0;
+}
+
+static int rproc_vdev_do_start(struct rproc_subdev *subdev)
+{
+ struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
+
+ return rproc_add_virtio_dev(rvdev, rvdev->id);
+}
+
+static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed)
+{
+ struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
+ struct device *dev = &rvdev->pdev->dev;
+ int ret;
+
+ ret = device_for_each_child(dev, NULL, rproc_remove_virtio_dev);
+ if (ret)
+ dev_warn(dev, "can't remove vdev child device: %d\n", ret);
+}
+
+static int rproc_virtio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rproc_vdev_data *rvdev_data = dev->platform_data;
+ struct rproc_vdev *rvdev;
+ struct rproc *rproc = container_of(dev->parent, struct rproc, dev);
+ struct fw_rsc_vdev *rsc;
+ int i, ret;
+
+ if (!rvdev_data)
+ return -EINVAL;
+
+ rvdev = devm_kzalloc(dev, sizeof(*rvdev), GFP_KERNEL);
+ if (!rvdev)
+ return -ENOMEM;
+
+ rvdev->id = rvdev_data->id;
+ rvdev->rproc = rproc;
+ rvdev->index = rvdev_data->index;
+
+ ret = copy_dma_range_map(dev, rproc->dev.parent);
+ if (ret)
+ return ret;
+
+ /* Make device dma capable by inheriting from parent's capabilities */
+ set_dma_ops(dev, get_dma_ops(rproc->dev.parent));
+
+ ret = dma_coerce_mask_and_coherent(dev, dma_get_mask(rproc->dev.parent));
+ if (ret) {
+ dev_warn(dev, "Failed to set DMA mask %llx. Trying to continue... (%pe)\n",
+ dma_get_mask(rproc->dev.parent), ERR_PTR(ret));
+ }
+
+ platform_set_drvdata(pdev, rvdev);
+ rvdev->pdev = pdev;
+
+ rsc = rvdev_data->rsc;
+
+ /* parse the vrings */
+ for (i = 0; i < rsc->num_of_vrings; i++) {
+ ret = rproc_parse_vring(rvdev, rsc, i);
+ if (ret)
+ return ret;
+ }
+
+ /* remember the resource offset*/
+ rvdev->rsc_offset = rvdev_data->rsc_offset;
+
+ /* allocate the vring resources */
+ for (i = 0; i < rsc->num_of_vrings; i++) {
+ ret = rproc_alloc_vring(rvdev, i);
+ if (ret)
+ goto unwind_vring_allocations;
+ }
+
+ rproc_add_rvdev(rproc, rvdev);
+
+ rvdev->subdev.start = rproc_vdev_do_start;
+ rvdev->subdev.stop = rproc_vdev_do_stop;
+
+ rproc_add_subdev(rproc, &rvdev->subdev);
+
+ /*
+ * We're indirectly making a non-temporary copy of the rproc pointer
+ * here, because the platform device or the vdev device will indirectly
+ * access the wrapping rproc.
+ *
+ * Therefore we must increment the rproc refcount here, and decrement
+ * it _only_ on platform remove.
+ */
+ get_device(&rproc->dev);
+
+ return 0;
+
+unwind_vring_allocations:
+ for (i--; i >= 0; i--)
+ rproc_free_vring(&rvdev->vring[i]);
+
+ return ret;
+}
+
+static void rproc_virtio_remove(struct platform_device *pdev)
+{
+ struct rproc_vdev *rvdev = dev_get_drvdata(&pdev->dev);
+ struct rproc *rproc = rvdev->rproc;
+ struct rproc_vring *rvring;
+ int id;
+
+ for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
+ rvring = &rvdev->vring[id];
+ rproc_free_vring(rvring);
+ }
+
+ rproc_remove_subdev(rproc, &rvdev->subdev);
+ rproc_remove_rvdev(rvdev);
+
+ of_reserved_mem_device_release(&pdev->dev);
+ dma_release_coherent_memory(&pdev->dev);
+
+ put_device(&rproc->dev);
+}
+
+/* Platform driver */
+static struct platform_driver rproc_virtio_driver = {
+ .probe = rproc_virtio_probe,
+ .remove_new = rproc_virtio_remove,
+ .driver = {
+ .name = "rproc-virtio",
+ },
+};
+builtin_platform_driver(rproc_virtio_driver);