// Copyright (c) 2011-2018, The Linux Foundation. All rights reserved.
// Copyright (c) 2018, Linaro Limited
+#include <linux/completion.h>
#include <linux/device.h>
+#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>
#include <linux/idr.h>
#include <linux/list.h>
#include <linux/rpmsg.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
+#include <uapi/misc/fastrpc.h>
#define ADSP_DOMAIN_ID (0)
#define MDSP_DOMAIN_ID (1)
#define CDSP_DOMAIN_ID (3)
#define FASTRPC_DEV_MAX 4 /* adsp, mdsp, slpi, cdsp*/
#define FASTRPC_MAX_SESSIONS 9 /*8 compute, 1 cpz*/
+#define FASTRPC_ALIGN 128
+#define FASTRPC_MAX_FDLIST 16
+#define FASTRPC_MAX_CRCLIST 64
+#define FASTRPC_PHYS(p) ((p) & 0xffffffff)
#define FASTRPC_CTX_MAX (256)
#define FASTRPC_CTXID_MASK (0xFF0)
#define FASTRPC_DEVICE_NAME "fastrpc"
+/* Retrives number of input buffers from the scalars parameter */
+#define REMOTE_SCALARS_INBUFS(sc) (((sc) >> 16) & 0x0ff)
+
+/* Retrives number of output buffers from the scalars parameter */
+#define REMOTE_SCALARS_OUTBUFS(sc) (((sc) >> 8) & 0x0ff)
+
+/* Retrives number of input handles from the scalars parameter */
+#define REMOTE_SCALARS_INHANDLES(sc) (((sc) >> 4) & 0x0f)
+
+/* Retrives number of output handles from the scalars parameter */
+#define REMOTE_SCALARS_OUTHANDLES(sc) ((sc) & 0x0f)
+
+#define REMOTE_SCALARS_LENGTH(sc) (REMOTE_SCALARS_INBUFS(sc) + \
+ REMOTE_SCALARS_OUTBUFS(sc) + \
+ REMOTE_SCALARS_INHANDLES(sc)+ \
+ REMOTE_SCALARS_OUTHANDLES(sc))
+#define FASTRPC_BUILD_SCALARS(attr, method, in, out, oin, oout) \
+ (((attr & 0x07) << 29) | \
+ ((method & 0x1f) << 24) | \
+ ((in & 0xff) << 16) | \
+ ((out & 0xff) << 8) | \
+ ((oin & 0x0f) << 4) | \
+ (oout & 0x0f))
+
+#define FASTRPC_SCALARS(method, in, out) \
+ FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)
+
#define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev)
static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
"sdsp", "cdsp"};
+struct fastrpc_phy_page {
+ u64 addr; /* physical address */
+ u64 size; /* size of contiguous region */
+};
+
+struct fastrpc_invoke_buf {
+ u32 num; /* number of contiguous regions */
+ u32 pgidx; /* index to start of contiguous region */
+};
+
+struct fastrpc_remote_arg {
+ u64 pv;
+ u64 len;
+};
+
+struct fastrpc_msg {
+ int pid; /* process group id */
+ int tid; /* thread id */
+ u64 ctx; /* invoke caller context */
+ u32 handle; /* handle to invoke */
+ u32 sc; /* scalars structure describing the data */
+ u64 addr; /* physical address */
+ u64 size; /* size of contiguous region */
+};
+
+struct fastrpc_invoke_rsp {
+ u64 ctx; /* invoke caller context */
+ int retval; /* invoke return value */
+};
+
+struct fastrpc_buf {
+ struct fastrpc_user *fl;
+ struct device *dev;
+ void *virt;
+ u64 phys;
+ u64 size;
+};
+
+struct fastrpc_map {
+ struct list_head node;
+ struct fastrpc_user *fl;
+ int fd;
+ struct dma_buf *buf;
+ struct sg_table *table;
+ struct dma_buf_attachment *attach;
+ u64 phys;
+ u64 size;
+ void *va;
+ u64 len;
+ struct kref refcount;
+};
+
+struct fastrpc_invoke_ctx {
+ int nscalars;
+ int nbufs;
+ int retval;
+ int pid;
+ int tgid;
+ u32 sc;
+ u32 *crc;
+ u64 ctxid;
+ u64 msg_sz;
+ struct kref refcount;
+ struct list_head node; /* list of ctxs */
+ struct completion work;
+ struct fastrpc_msg msg;
+ struct fastrpc_user *fl;
+ struct fastrpc_remote_arg *rpra;
+ struct fastrpc_map **maps;
+ struct fastrpc_buf *buf;
+ struct fastrpc_invoke_args *args;
+ struct fastrpc_channel_ctx *cctx;
+};
struct fastrpc_session_ctx {
struct device *dev;
struct fastrpc_channel_ctx *cctx;
struct fastrpc_session_ctx *sctx;
+ struct fastrpc_buf *init_mem;
int tgid;
int pd;
struct mutex mutex;
};
+static void fastrpc_free_map(struct kref *ref)
+{
+ struct fastrpc_map *map;
+
+ map = container_of(ref, struct fastrpc_map, refcount);
+
+ if (map->table) {
+ dma_buf_unmap_attachment(map->attach, map->table,
+ DMA_BIDIRECTIONAL);
+ dma_buf_detach(map->buf, map->attach);
+ dma_buf_put(map->buf);
+ }
+
+ kfree(map);
+}
+
+static void fastrpc_map_put(struct fastrpc_map *map)
+{
+ if (map)
+ kref_put(&map->refcount, fastrpc_free_map);
+}
+
+static void fastrpc_map_get(struct fastrpc_map *map)
+{
+ if (map)
+ kref_get(&map->refcount);
+}
+
+static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
+ struct fastrpc_map **ppmap)
+{
+ struct fastrpc_map *map = NULL;
+
+ mutex_lock(&fl->mutex);
+ list_for_each_entry(map, &fl->maps, node) {
+ if (map->fd == fd) {
+ fastrpc_map_get(map);
+ *ppmap = map;
+ mutex_unlock(&fl->mutex);
+ return 0;
+ }
+ }
+ mutex_unlock(&fl->mutex);
+
+ return -ENOENT;
+}
+
+static void fastrpc_buf_free(struct fastrpc_buf *buf)
+{
+ dma_free_coherent(buf->dev, buf->size, buf->virt,
+ FASTRPC_PHYS(buf->phys));
+ kfree(buf);
+}
+
+static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
+ u64 size, struct fastrpc_buf **obuf)
+{
+ struct fastrpc_buf *buf;
+
+ buf = kzalloc(sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ buf->fl = fl;
+ buf->virt = NULL;
+ buf->phys = 0;
+ buf->size = size;
+ buf->dev = dev;
+
+ buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
+ GFP_KERNEL);
+ if (!buf->virt)
+ return -ENOMEM;
+
+ if (fl->sctx && fl->sctx->sid)
+ buf->phys += ((u64)fl->sctx->sid << 32);
+
+ *obuf = buf;
+
+ return 0;
+}
+
+static void fastrpc_context_free(struct kref *ref)
+{
+ struct fastrpc_invoke_ctx *ctx;
+ struct fastrpc_channel_ctx *cctx;
+ int i;
+
+ ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
+ cctx = ctx->cctx;
+
+ for (i = 0; i < ctx->nscalars; i++)
+ fastrpc_map_put(ctx->maps[i]);
+
+ if (ctx->buf)
+ fastrpc_buf_free(ctx->buf);
+
+ spin_lock(&cctx->lock);
+ idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
+ spin_unlock(&cctx->lock);
+
+ kfree(ctx->maps);
+ kfree(ctx);
+}
+
+static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
+{
+ kref_get(&ctx->refcount);
+}
+
+static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
+{
+ kref_put(&ctx->refcount, fastrpc_context_free);
+}
+
+static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
+ struct fastrpc_user *user, u32 kernel, u32 sc,
+ struct fastrpc_invoke_args *args)
+{
+ struct fastrpc_channel_ctx *cctx = user->cctx;
+ struct fastrpc_invoke_ctx *ctx = NULL;
+ int ret;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&ctx->node);
+ ctx->fl = user;
+ ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
+ ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
+ REMOTE_SCALARS_OUTBUFS(sc);
+
+ if (ctx->nscalars) {
+ ctx->maps = kcalloc(ctx->nscalars,
+ sizeof(*ctx->maps), GFP_KERNEL);
+ if (!ctx->maps) {
+ kfree(ctx);
+ return ERR_PTR(-ENOMEM);
+ }
+ ctx->args = args;
+ }
+
+ ctx->sc = sc;
+ ctx->retval = -1;
+ ctx->pid = current->pid;
+ ctx->tgid = user->tgid;
+ ctx->cctx = cctx;
+ init_completion(&ctx->work);
+
+ spin_lock(&user->lock);
+ list_add_tail(&ctx->node, &user->pending);
+ spin_unlock(&user->lock);
+
+ spin_lock(&cctx->lock);
+ ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
+ FASTRPC_CTX_MAX, GFP_ATOMIC);
+ if (ret < 0) {
+ spin_unlock(&cctx->lock);
+ goto err_idr;
+ }
+ ctx->ctxid = ret << 4;
+ spin_unlock(&cctx->lock);
+
+ kref_init(&ctx->refcount);
+
+ return ctx;
+err_idr:
+ spin_lock(&user->lock);
+ list_del(&ctx->node);
+ spin_unlock(&user->lock);
+ kfree(ctx->maps);
+ kfree(ctx);
+
+ return ERR_PTR(ret);
+}
+
+static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
+ u64 len, struct fastrpc_map **ppmap)
+{
+ struct fastrpc_session_ctx *sess = fl->sctx;
+ struct fastrpc_map *map = NULL;
+ int err = 0;
+
+ if (!fastrpc_map_find(fl, fd, ppmap))
+ return 0;
+
+ map = kzalloc(sizeof(*map), GFP_KERNEL);
+ if (!map)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&map->node);
+ map->fl = fl;
+ map->fd = fd;
+ map->buf = dma_buf_get(fd);
+ if (!map->buf) {
+ err = -EINVAL;
+ goto get_err;
+ }
+
+ map->attach = dma_buf_attach(map->buf, sess->dev);
+ if (IS_ERR(map->attach)) {
+ dev_err(sess->dev, "Failed to attach dmabuf\n");
+ err = PTR_ERR(map->attach);
+ goto attach_err;
+ }
+
+ map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
+ if (IS_ERR(map->table)) {
+ err = PTR_ERR(map->table);
+ goto map_err;
+ }
+
+ map->phys = sg_dma_address(map->table->sgl);
+ map->phys += ((u64)fl->sctx->sid << 32);
+ map->size = len;
+ map->va = sg_virt(map->table->sgl);
+ map->len = len;
+ kref_init(&map->refcount);
+
+ spin_lock(&fl->lock);
+ list_add_tail(&map->node, &fl->maps);
+ spin_unlock(&fl->lock);
+ *ppmap = map;
+
+ return 0;
+
+map_err:
+ dma_buf_detach(map->buf, map->attach);
+attach_err:
+ dma_buf_put(map->buf);
+get_err:
+ kfree(map);
+
+ return err;
+}
+
+/*
+ * Fastrpc payload buffer with metadata looks like:
+ *
+ * >>>>>> START of METADATA <<<<<<<<<
+ * +---------------------------------+
+ * | Arguments |
+ * | type:(struct fastrpc_remote_arg)|
+ * | (0 - N) |
+ * +---------------------------------+
+ * | Invoke Buffer list |
+ * | type:(struct fastrpc_invoke_buf)|
+ * | (0 - N) |
+ * +---------------------------------+
+ * | Page info list |
+ * | type:(struct fastrpc_phy_page) |
+ * | (0 - N) |
+ * +---------------------------------+
+ * | Optional info |
+ * |(can be specific to SoC/Firmware)|
+ * +---------------------------------+
+ * >>>>>>>> END of METADATA <<<<<<<<<
+ * +---------------------------------+
+ * | Inline ARGS |
+ * | (0-N) |
+ * +---------------------------------+
+ */
+
+static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
+{
+ int size = 0;
+
+ size = (sizeof(struct fastrpc_remote_arg) +
+ sizeof(struct fastrpc_invoke_buf) +
+ sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
+ sizeof(u64) * FASTRPC_MAX_FDLIST +
+ sizeof(u32) * FASTRPC_MAX_CRCLIST;
+
+ return size;
+}
+
+static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
+{
+ u64 size = 0;
+ int i;
+
+ size = ALIGN(metalen, FASTRPC_ALIGN);
+ for (i = 0; i < ctx->nscalars; i++) {
+ if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
+ size = ALIGN(size, FASTRPC_ALIGN);
+ size += ctx->args[i].length;
+ }
+ }
+
+ return size;
+}
+
+static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
+{
+ struct device *dev = ctx->fl->sctx->dev;
+ int i, err;
+
+ for (i = 0; i < ctx->nscalars; ++i) {
+ /* Make sure reserved field is set to 0 */
+ if (ctx->args[i].reserved)
+ return -EINVAL;
+
+ if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
+ ctx->args[i].length == 0)
+ continue;
+
+ err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
+ ctx->args[i].length, &ctx->maps[i]);
+ if (err) {
+ dev_err(dev, "Error Creating map %d\n", err);
+ return -EINVAL;
+ }
+
+ }
+ return 0;
+}
+
+static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
+{
+ struct device *dev = ctx->fl->sctx->dev;
+ struct fastrpc_remote_arg *rpra;
+ struct fastrpc_invoke_buf *list;
+ struct fastrpc_phy_page *pages;
+ int inbufs, i, err = 0;
+ u64 rlen, pkt_size;
+ uintptr_t args;
+ int metalen;
+
+
+ inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
+ metalen = fastrpc_get_meta_size(ctx);
+ pkt_size = fastrpc_get_payload_size(ctx, metalen);
+
+ err = fastrpc_create_maps(ctx);
+ if (err)
+ return err;
+
+ ctx->msg_sz = pkt_size;
+
+ err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
+ if (err)
+ return err;
+
+ rpra = ctx->buf->virt;
+ list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
+ pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
+ sizeof(*rpra));
+ args = (uintptr_t)ctx->buf->virt + metalen;
+ rlen = pkt_size - metalen;
+ ctx->rpra = rpra;
+
+ for (i = 0; i < ctx->nbufs; ++i) {
+ u64 len = ctx->args[i].length;
+
+ rpra[i].pv = 0;
+ rpra[i].len = len;
+ list[i].num = len ? 1 : 0;
+ list[i].pgidx = i;
+
+ if (!len)
+ continue;
+
+ pages[i].size = roundup(len, PAGE_SIZE);
+
+ if (ctx->maps[i]) {
+ rpra[i].pv = (u64) ctx->args[i].ptr;
+ pages[i].addr = ctx->maps[i]->phys;
+ } else {
+ rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
+ args = ALIGN(args, FASTRPC_ALIGN);
+ if (rlen < len)
+ goto bail;
+
+ rpra[i].pv = args;
+ pages[i].addr = ctx->buf->phys + (pkt_size - rlen);
+ pages[i].addr = pages[i].addr & PAGE_MASK;
+ args = args + len;
+ rlen -= len;
+ }
+
+ if (i < inbufs && !ctx->maps[i]) {
+ void *dst = (void *)(uintptr_t)rpra[i].pv;
+ void *src = (void *)(uintptr_t)ctx->args[i].ptr;
+
+ if (!kernel) {
+ if (copy_from_user(dst, (void __user *)src,
+ len)) {
+ err = -EFAULT;
+ goto bail;
+ }
+ } else {
+ memcpy(dst, src, len);
+ }
+ }
+ }
+
+ for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
+ rpra[i].pv = (u64) ctx->args[i].ptr;
+ rpra[i].len = ctx->args[i].length;
+ list[i].num = ctx->args[i].length ? 1 : 0;
+ list[i].pgidx = i;
+ pages[i].addr = ctx->maps[i]->phys;
+ pages[i].size = ctx->maps[i]->size;
+ }
+
+bail:
+ if (err)
+ dev_err(dev, "Error: get invoke args failed:%d\n", err);
+
+ return err;
+}
+
+static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
+ u32 kernel)
+{
+ struct fastrpc_remote_arg *rpra = ctx->rpra;
+ int i, inbufs;
+
+ inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
+
+ for (i = inbufs; i < ctx->nbufs; ++i) {
+ void *src = (void *)(uintptr_t)rpra[i].pv;
+ void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
+ u64 len = rpra[i].len;
+
+ if (!kernel) {
+ if (copy_to_user((void __user *)dst, src, len))
+ return -EFAULT;
+ } else {
+ memcpy(dst, src, len);
+ }
+ }
+
+ return 0;
+}
+
+static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
+ struct fastrpc_invoke_ctx *ctx,
+ u32 kernel, uint32_t handle)
+{
+ struct fastrpc_channel_ctx *cctx;
+ struct fastrpc_user *fl = ctx->fl;
+ struct fastrpc_msg *msg = &ctx->msg;
+
+ cctx = fl->cctx;
+ msg->pid = fl->tgid;
+ msg->tid = current->pid;
+
+ if (kernel)
+ msg->pid = 0;
+
+ msg->ctx = ctx->ctxid | fl->pd;
+ msg->handle = handle;
+ msg->sc = ctx->sc;
+ msg->addr = ctx->buf ? ctx->buf->phys : 0;
+ msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
+ fastrpc_context_get(ctx);
+
+ return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
+}
+
+static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
+ u32 handle, u32 sc,
+ struct fastrpc_invoke_args *args)
+{
+ struct fastrpc_invoke_ctx *ctx = NULL;
+ int err = 0;
+
+ if (!fl->sctx)
+ return -EINVAL;
+
+ ctx = fastrpc_context_alloc(fl, kernel, sc, args);
+ if (IS_ERR(ctx))
+ return PTR_ERR(ctx);
+
+ if (ctx->nscalars) {
+ err = fastrpc_get_args(kernel, ctx);
+ if (err)
+ goto bail;
+ }
+ /* Send invoke buffer to remote dsp */
+ err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
+ if (err)
+ goto bail;
+
+ /* Wait for remote dsp to respond or time out */
+ err = wait_for_completion_interruptible(&ctx->work);
+ if (err)
+ goto bail;
+
+ /* Check the response from remote dsp */
+ err = ctx->retval;
+ if (err)
+ goto bail;
+
+ if (ctx->nscalars) {
+ /* populate all the output buffers with results */
+ err = fastrpc_put_args(ctx, kernel);
+ if (err)
+ goto bail;
+ }
+
+bail:
+ /* We are done with this compute context, remove it from pending list */
+ spin_lock(&fl->lock);
+ list_del(&ctx->node);
+ spin_unlock(&fl->lock);
+ fastrpc_context_put(ctx);
+
+ if (err)
+ dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
+
+ return err;
+}
+
static struct fastrpc_session_ctx *fastrpc_session_alloc(
struct fastrpc_channel_ctx *cctx)
{
{
struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
struct fastrpc_channel_ctx *cctx = fl->cctx;
+ struct fastrpc_invoke_ctx *ctx, *n;
+ struct fastrpc_map *map, *m;
spin_lock(&cctx->lock);
list_del(&fl->user);
spin_unlock(&cctx->lock);
+ if (fl->init_mem)
+ fastrpc_buf_free(fl->init_mem);
+
+ list_for_each_entry_safe(ctx, n, &fl->pending, node) {
+ list_del(&ctx->node);
+ fastrpc_context_put(ctx);
+ }
+
+ list_for_each_entry_safe(map, m, &fl->maps, node) {
+ list_del(&map->node);
+ fastrpc_map_put(map);
+ }
+
fastrpc_session_free(cctx, fl->sctx);
mutex_destroy(&fl->mutex);
return 0;
}
+static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
+{
+ struct fastrpc_invoke_args *args = NULL;
+ struct fastrpc_invoke inv;
+ u32 nscalars;
+ int err;
+
+ if (copy_from_user(&inv, argp, sizeof(inv)))
+ return -EFAULT;
+
+ /* nscalars is truncated here to max supported value */
+ nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
+ if (nscalars) {
+ args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
+ if (!args)
+ return -ENOMEM;
+
+ if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
+ nscalars * sizeof(*args))) {
+ kfree(args);
+ return -EFAULT;
+ }
+ }
+
+ err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
+ kfree(args);
+
+ return err;
+}
+
+static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
+ char __user *argp = (char __user *)arg;
+ int err;
+
+ switch (cmd) {
+ case FASTRPC_IOCTL_INVOKE:
+ err = fastrpc_invoke(fl, argp);
+ break;
+ default:
+ err = -ENOTTY;
+ break;
+ }
+
+ return err;
+}
+
static const struct file_operations fastrpc_fops = {
.open = fastrpc_device_open,
.release = fastrpc_device_release,
+ .unlocked_ioctl = fastrpc_device_ioctl,
+ .compat_ioctl = fastrpc_device_ioctl,
};
static int fastrpc_cb_probe(struct platform_device *pdev)
return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
}
+static void fastrpc_notify_users(struct fastrpc_user *user)
+{
+ struct fastrpc_invoke_ctx *ctx;
+
+ spin_lock(&user->lock);
+ list_for_each_entry(ctx, &user->pending, node)
+ complete(&ctx->work);
+ spin_unlock(&user->lock);
+}
+
static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
{
struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
+ struct fastrpc_user *user;
+
+ spin_lock(&cctx->lock);
+ list_for_each_entry(user, &cctx->users, user)
+ fastrpc_notify_users(user);
+ spin_unlock(&cctx->lock);
misc_deregister(&cctx->miscdev);
of_platform_depopulate(&rpdev->dev);
static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
int len, void *priv, u32 addr)
{
+ struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
+ struct fastrpc_invoke_rsp *rsp = data;
+ struct fastrpc_invoke_ctx *ctx;
+ unsigned long flags;
+ unsigned long ctxid;
+
+ if (len < sizeof(*rsp))
+ return -EINVAL;
+
+ ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ ctx = idr_find(&cctx->ctx_idr, ctxid);
+ spin_unlock_irqrestore(&cctx->lock, flags);
+
+ if (!ctx) {
+ dev_err(&rpdev->dev, "No context ID matches response\n");
+ return -ENOENT;
+ }
+
+ ctx->retval = rsp->retval;
+ complete(&ctx->work);
+ fastrpc_context_put(ctx);
+
return 0;
}
projects / openwrt / staging / blogic.git / commitdiff