Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
new file mode 100644
index 0000000..1b1a794
--- /dev/null
+++ b/drivers/misc/fastrpc.c
@@ -0,0 +1,1561 @@
+// SPDX-License-Identifier: GPL-2.0
+// 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/miscdevice.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/sort.h>
+#include <linux/of_platform.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 SDSP_DOMAIN_ID (2)
+#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_INIT_HANDLE 1
+#define FASTRPC_CTXID_MASK (0xFF0)
+#define INIT_FILELEN_MAX (64 * 1024 * 1024)
+#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 FASTRPC_CREATE_PROCESS_NARGS 6
+/* Remote Method id table */
+#define FASTRPC_RMID_INIT_ATTACH 0
+#define FASTRPC_RMID_INIT_RELEASE 1
+#define FASTRPC_RMID_INIT_CREATE 6
+#define FASTRPC_RMID_INIT_CREATE_ATTR 7
+#define FASTRPC_RMID_INIT_CREATE_STATIC 8
+
+#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_overlap {
+ u64 start;
+ u64 end;
+ int raix;
+ u64 mstart;
+ u64 mend;
+ u64 offset;
+};
+
+struct fastrpc_buf {
+ struct fastrpc_user *fl;
+ struct dma_buf *dmabuf;
+ struct device *dev;
+ void *virt;
+ u64 phys;
+ u64 size;
+ /* Lock for dma buf attachments */
+ struct mutex lock;
+ struct list_head attachments;
+};
+
+struct fastrpc_dma_buf_attachment {
+ struct device *dev;
+ struct sg_table sgt;
+ struct list_head node;
+};
+
+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 work_struct put_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_buf_overlap *olaps;
+ struct fastrpc_channel_ctx *cctx;
+};
+
+struct fastrpc_session_ctx {
+ struct device *dev;
+ int sid;
+ bool used;
+ bool valid;
+};
+
+struct fastrpc_channel_ctx {
+ int domain_id;
+ int sesscount;
+ struct rpmsg_device *rpdev;
+ struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
+ spinlock_t lock;
+ struct idr ctx_idr;
+ struct list_head users;
+ struct miscdevice miscdev;
+ struct kref refcount;
+};
+
+struct fastrpc_user {
+ struct list_head user;
+ struct list_head maps;
+ struct list_head pending;
+
+ struct fastrpc_channel_ctx *cctx;
+ struct fastrpc_session_ctx *sctx;
+ struct fastrpc_buf *init_mem;
+
+ int tgid;
+ int pd;
+ /* Lock for lists */
+ spinlock_t lock;
+ /* lock for allocations */
+ 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;
+
+ INIT_LIST_HEAD(&buf->attachments);
+ mutex_init(&buf->lock);
+
+ 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) {
+ mutex_destroy(&buf->lock);
+ kfree(buf);
+ return -ENOMEM;
+ }
+
+ if (fl->sctx && fl->sctx->sid)
+ buf->phys += ((u64)fl->sctx->sid << 32);
+
+ *obuf = buf;
+
+ return 0;
+}
+
+static void fastrpc_channel_ctx_free(struct kref *ref)
+{
+ struct fastrpc_channel_ctx *cctx;
+
+ cctx = container_of(ref, struct fastrpc_channel_ctx, refcount);
+
+ kfree(cctx);
+}
+
+static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
+{
+ kref_get(&cctx->refcount);
+}
+
+static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
+{
+ kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
+}
+
+static void fastrpc_context_free(struct kref *ref)
+{
+ struct fastrpc_invoke_ctx *ctx;
+ struct fastrpc_channel_ctx *cctx;
+ unsigned long flags;
+ 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_irqsave(&cctx->lock, flags);
+ idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
+ spin_unlock_irqrestore(&cctx->lock, flags);
+
+ kfree(ctx->maps);
+ kfree(ctx->olaps);
+ kfree(ctx);
+
+ fastrpc_channel_ctx_put(cctx);
+}
+
+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 void fastrpc_context_put_wq(struct work_struct *work)
+{
+ struct fastrpc_invoke_ctx *ctx =
+ container_of(work, struct fastrpc_invoke_ctx, put_work);
+
+ fastrpc_context_put(ctx);
+}
+
+#define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
+static int olaps_cmp(const void *a, const void *b)
+{
+ struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a;
+ struct fastrpc_buf_overlap *pb = (struct fastrpc_buf_overlap *)b;
+ /* sort with lowest starting buffer first */
+ int st = CMP(pa->start, pb->start);
+ /* sort with highest ending buffer first */
+ int ed = CMP(pb->end, pa->end);
+
+ return st == 0 ? ed : st;
+}
+
+static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx)
+{
+ u64 max_end = 0;
+ int i;
+
+ for (i = 0; i < ctx->nbufs; ++i) {
+ ctx->olaps[i].start = ctx->args[i].ptr;
+ ctx->olaps[i].end = ctx->olaps[i].start + ctx->args[i].length;
+ ctx->olaps[i].raix = i;
+ }
+
+ sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL);
+
+ for (i = 0; i < ctx->nbufs; ++i) {
+ /* Falling inside previous range */
+ if (ctx->olaps[i].start < max_end) {
+ ctx->olaps[i].mstart = max_end;
+ ctx->olaps[i].mend = ctx->olaps[i].end;
+ ctx->olaps[i].offset = max_end - ctx->olaps[i].start;
+
+ if (ctx->olaps[i].end > max_end) {
+ max_end = ctx->olaps[i].end;
+ } else {
+ ctx->olaps[i].mend = 0;
+ ctx->olaps[i].mstart = 0;
+ }
+
+ } else {
+ ctx->olaps[i].mend = ctx->olaps[i].end;
+ ctx->olaps[i].mstart = ctx->olaps[i].start;
+ ctx->olaps[i].offset = 0;
+ max_end = ctx->olaps[i].end;
+ }
+ }
+}
+
+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;
+ unsigned long flags;
+ 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->olaps = kcalloc(ctx->nscalars,
+ sizeof(*ctx->olaps), GFP_KERNEL);
+ if (!ctx->olaps) {
+ kfree(ctx->maps);
+ kfree(ctx);
+ return ERR_PTR(-ENOMEM);
+ }
+ ctx->args = args;
+ fastrpc_get_buff_overlaps(ctx);
+ }
+
+ /* Released in fastrpc_context_put() */
+ fastrpc_channel_ctx_get(cctx);
+
+ ctx->sc = sc;
+ ctx->retval = -1;
+ ctx->pid = current->pid;
+ ctx->tgid = user->tgid;
+ ctx->cctx = cctx;
+ init_completion(&ctx->work);
+ INIT_WORK(&ctx->put_work, fastrpc_context_put_wq);
+
+ spin_lock(&user->lock);
+ list_add_tail(&ctx->node, &user->pending);
+ spin_unlock(&user->lock);
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
+ FASTRPC_CTX_MAX, GFP_ATOMIC);
+ if (ret < 0) {
+ spin_unlock_irqrestore(&cctx->lock, flags);
+ goto err_idr;
+ }
+ ctx->ctxid = ret << 4;
+ spin_unlock_irqrestore(&cctx->lock, flags);
+
+ kref_init(&ctx->refcount);
+
+ return ctx;
+err_idr:
+ spin_lock(&user->lock);
+ list_del(&ctx->node);
+ spin_unlock(&user->lock);
+ fastrpc_channel_ctx_put(cctx);
+ kfree(ctx->maps);
+ kfree(ctx->olaps);
+ kfree(ctx);
+
+ return ERR_PTR(ret);
+}
+
+static struct sg_table *
+fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
+ enum dma_data_direction dir)
+{
+ struct fastrpc_dma_buf_attachment *a = attachment->priv;
+ struct sg_table *table;
+
+ table = &a->sgt;
+
+ if (!dma_map_sg(attachment->dev, table->sgl, table->nents, dir))
+ return ERR_PTR(-ENOMEM);
+
+ return table;
+}
+
+static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
+ struct sg_table *table,
+ enum dma_data_direction dir)
+{
+ dma_unmap_sg(attach->dev, table->sgl, table->nents, dir);
+}
+
+static void fastrpc_release(struct dma_buf *dmabuf)
+{
+ struct fastrpc_buf *buffer = dmabuf->priv;
+
+ fastrpc_buf_free(buffer);
+}
+
+static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
+ struct dma_buf_attachment *attachment)
+{
+ struct fastrpc_dma_buf_attachment *a;
+ struct fastrpc_buf *buffer = dmabuf->priv;
+ int ret;
+
+ a = kzalloc(sizeof(*a), GFP_KERNEL);
+ if (!a)
+ return -ENOMEM;
+
+ ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
+ FASTRPC_PHYS(buffer->phys), buffer->size);
+ if (ret < 0) {
+ dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
+ kfree(a);
+ return -EINVAL;
+ }
+
+ a->dev = attachment->dev;
+ INIT_LIST_HEAD(&a->node);
+ attachment->priv = a;
+
+ mutex_lock(&buffer->lock);
+ list_add(&a->node, &buffer->attachments);
+ mutex_unlock(&buffer->lock);
+
+ return 0;
+}
+
+static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
+ struct dma_buf_attachment *attachment)
+{
+ struct fastrpc_dma_buf_attachment *a = attachment->priv;
+ struct fastrpc_buf *buffer = dmabuf->priv;
+
+ mutex_lock(&buffer->lock);
+ list_del(&a->node);
+ mutex_unlock(&buffer->lock);
+ sg_free_table(&a->sgt);
+ kfree(a);
+}
+
+static void *fastrpc_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
+{
+ struct fastrpc_buf *buf = dmabuf->priv;
+
+ return buf->virt ? buf->virt + pgnum * PAGE_SIZE : NULL;
+}
+
+static void *fastrpc_vmap(struct dma_buf *dmabuf)
+{
+ struct fastrpc_buf *buf = dmabuf->priv;
+
+ return buf->virt;
+}
+
+static int fastrpc_mmap(struct dma_buf *dmabuf,
+ struct vm_area_struct *vma)
+{
+ struct fastrpc_buf *buf = dmabuf->priv;
+ size_t size = vma->vm_end - vma->vm_start;
+
+ return dma_mmap_coherent(buf->dev, vma, buf->virt,
+ FASTRPC_PHYS(buf->phys), size);
+}
+
+static const struct dma_buf_ops fastrpc_dma_buf_ops = {
+ .attach = fastrpc_dma_buf_attach,
+ .detach = fastrpc_dma_buf_detatch,
+ .map_dma_buf = fastrpc_map_dma_buf,
+ .unmap_dma_buf = fastrpc_unmap_dma_buf,
+ .mmap = fastrpc_mmap,
+ .map = fastrpc_kmap,
+ .vmap = fastrpc_vmap,
+ .release = fastrpc_release,
+};
+
+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 (IS_ERR(map->buf)) {
+ err = PTR_ERR(map->buf);
+ 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) {
+
+ if (ctx->olaps[i].offset == 0)
+ size = ALIGN(size, FASTRPC_ALIGN);
+
+ size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
+ }
+ }
+
+ 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, oix, err = 0;
+ u64 len, rlen, pkt_size;
+ u64 pg_start, pg_end;
+ 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 (oix = 0; oix < ctx->nbufs; ++oix) {
+ int mlen;
+
+ i = ctx->olaps[oix].raix;
+ 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;
+
+ if (ctx->maps[i]) {
+ struct vm_area_struct *vma = NULL;
+
+ rpra[i].pv = (u64) ctx->args[i].ptr;
+ pages[i].addr = ctx->maps[i]->phys;
+
+ vma = find_vma(current->mm, ctx->args[i].ptr);
+ if (vma)
+ pages[i].addr += ctx->args[i].ptr -
+ vma->vm_start;
+
+ pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
+ pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
+ PAGE_SHIFT;
+ pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
+
+ } else {
+
+ if (ctx->olaps[oix].offset == 0) {
+ rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
+ args = ALIGN(args, FASTRPC_ALIGN);
+ }
+
+ mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
+
+ if (rlen < mlen)
+ goto bail;
+
+ rpra[i].pv = args - ctx->olaps[oix].offset;
+ pages[i].addr = ctx->buf->phys -
+ ctx->olaps[oix].offset +
+ (pkt_size - rlen);
+ pages[i].addr = pages[i].addr & PAGE_MASK;
+
+ pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
+ pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
+ pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
+ args = args + mlen;
+ rlen -= mlen;
+ }
+
+ 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;
+
+ if (!fl->cctx->rpdev)
+ return -EPIPE;
+
+ 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;
+ }
+
+ /* make sure that all CPU memory writes are seen by DSP */
+ dma_wmb();
+ /* 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) {
+ /* make sure that all memory writes by DSP are seen by CPU */
+ dma_rmb();
+ /* 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 int fastrpc_init_create_process(struct fastrpc_user *fl,
+ char __user *argp)
+{
+ struct fastrpc_init_create init;
+ struct fastrpc_invoke_args *args;
+ struct fastrpc_phy_page pages[1];
+ struct fastrpc_map *map = NULL;
+ struct fastrpc_buf *imem = NULL;
+ int memlen;
+ int err;
+ struct {
+ int pgid;
+ u32 namelen;
+ u32 filelen;
+ u32 pageslen;
+ u32 attrs;
+ u32 siglen;
+ } inbuf;
+ u32 sc;
+
+ args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
+ if (!args)
+ return -ENOMEM;
+
+ if (copy_from_user(&init, argp, sizeof(init))) {
+ err = -EFAULT;
+ goto err;
+ }
+
+ if (init.filelen > INIT_FILELEN_MAX) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ inbuf.pgid = fl->tgid;
+ inbuf.namelen = strlen(current->comm) + 1;
+ inbuf.filelen = init.filelen;
+ inbuf.pageslen = 1;
+ inbuf.attrs = init.attrs;
+ inbuf.siglen = init.siglen;
+ fl->pd = 1;
+
+ if (init.filelen && init.filefd) {
+ err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
+ if (err)
+ goto err;
+ }
+
+ memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
+ 1024 * 1024);
+ err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
+ &imem);
+ if (err)
+ goto err_alloc;
+
+ fl->init_mem = imem;
+ args[0].ptr = (u64)(uintptr_t)&inbuf;
+ args[0].length = sizeof(inbuf);
+ args[0].fd = -1;
+
+ args[1].ptr = (u64)(uintptr_t)current->comm;
+ args[1].length = inbuf.namelen;
+ args[1].fd = -1;
+
+ args[2].ptr = (u64) init.file;
+ args[2].length = inbuf.filelen;
+ args[2].fd = init.filefd;
+
+ pages[0].addr = imem->phys;
+ pages[0].size = imem->size;
+
+ args[3].ptr = (u64)(uintptr_t) pages;
+ args[3].length = 1 * sizeof(*pages);
+ args[3].fd = -1;
+
+ args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
+ args[4].length = sizeof(inbuf.attrs);
+ args[4].fd = -1;
+
+ args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
+ args[5].length = sizeof(inbuf.siglen);
+ args[5].fd = -1;
+
+ sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
+ if (init.attrs)
+ sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
+
+ err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
+ sc, args);
+ if (err)
+ goto err_invoke;
+
+ kfree(args);
+
+ return 0;
+
+err_invoke:
+ fl->init_mem = NULL;
+ fastrpc_buf_free(imem);
+err_alloc:
+ if (map) {
+ spin_lock(&fl->lock);
+ list_del(&map->node);
+ spin_unlock(&fl->lock);
+ fastrpc_map_put(map);
+ }
+err:
+ kfree(args);
+
+ return err;
+}
+
+static struct fastrpc_session_ctx *fastrpc_session_alloc(
+ struct fastrpc_channel_ctx *cctx)
+{
+ struct fastrpc_session_ctx *session = NULL;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ for (i = 0; i < cctx->sesscount; i++) {
+ if (!cctx->session[i].used && cctx->session[i].valid) {
+ cctx->session[i].used = true;
+ session = &cctx->session[i];
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&cctx->lock, flags);
+
+ return session;
+}
+
+static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
+ struct fastrpc_session_ctx *session)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ session->used = false;
+ spin_unlock_irqrestore(&cctx->lock, flags);
+}
+
+static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
+{
+ struct fastrpc_invoke_args args[1];
+ int tgid = 0;
+ u32 sc;
+
+ tgid = fl->tgid;
+ args[0].ptr = (u64)(uintptr_t) &tgid;
+ args[0].length = sizeof(tgid);
+ args[0].fd = -1;
+ args[0].reserved = 0;
+ sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
+
+ return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
+ sc, &args[0]);
+}
+
+static int fastrpc_device_release(struct inode *inode, struct file *file)
+{
+ 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;
+ unsigned long flags;
+
+ fastrpc_release_current_dsp_process(fl);
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ list_del(&fl->user);
+ spin_unlock_irqrestore(&cctx->lock, flags);
+
+ 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);
+ fastrpc_channel_ctx_put(cctx);
+
+ mutex_destroy(&fl->mutex);
+ kfree(fl);
+ file->private_data = NULL;
+
+ return 0;
+}
+
+static int fastrpc_device_open(struct inode *inode, struct file *filp)
+{
+ struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
+ struct fastrpc_user *fl = NULL;
+ unsigned long flags;
+
+ fl = kzalloc(sizeof(*fl), GFP_KERNEL);
+ if (!fl)
+ return -ENOMEM;
+
+ /* Released in fastrpc_device_release() */
+ fastrpc_channel_ctx_get(cctx);
+
+ filp->private_data = fl;
+ spin_lock_init(&fl->lock);
+ mutex_init(&fl->mutex);
+ INIT_LIST_HEAD(&fl->pending);
+ INIT_LIST_HEAD(&fl->maps);
+ INIT_LIST_HEAD(&fl->user);
+ fl->tgid = current->tgid;
+ fl->cctx = cctx;
+
+ fl->sctx = fastrpc_session_alloc(cctx);
+ if (!fl->sctx) {
+ dev_err(&cctx->rpdev->dev, "No session available\n");
+ mutex_destroy(&fl->mutex);
+ kfree(fl);
+
+ return -EBUSY;
+ }
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ list_add_tail(&fl->user, &cctx->users);
+ spin_unlock_irqrestore(&cctx->lock, flags);
+
+ return 0;
+}
+
+static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
+{
+ struct fastrpc_alloc_dma_buf bp;
+ DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
+ struct fastrpc_buf *buf = NULL;
+ int err;
+
+ if (copy_from_user(&bp, argp, sizeof(bp)))
+ return -EFAULT;
+
+ err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
+ if (err)
+ return err;
+ exp_info.ops = &fastrpc_dma_buf_ops;
+ exp_info.size = bp.size;
+ exp_info.flags = O_RDWR;
+ exp_info.priv = buf;
+ buf->dmabuf = dma_buf_export(&exp_info);
+ if (IS_ERR(buf->dmabuf)) {
+ err = PTR_ERR(buf->dmabuf);
+ fastrpc_buf_free(buf);
+ return err;
+ }
+
+ bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
+ if (bp.fd < 0) {
+ dma_buf_put(buf->dmabuf);
+ return -EINVAL;
+ }
+
+ if (copy_to_user(argp, &bp, sizeof(bp))) {
+ dma_buf_put(buf->dmabuf);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int fastrpc_init_attach(struct fastrpc_user *fl)
+{
+ struct fastrpc_invoke_args args[1];
+ int tgid = fl->tgid;
+ u32 sc;
+
+ args[0].ptr = (u64)(uintptr_t) &tgid;
+ args[0].length = sizeof(tgid);
+ args[0].fd = -1;
+ args[0].reserved = 0;
+ sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
+ fl->pd = 0;
+
+ return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
+ sc, &args[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;
+ case FASTRPC_IOCTL_INIT_ATTACH:
+ err = fastrpc_init_attach(fl);
+ break;
+ case FASTRPC_IOCTL_INIT_CREATE:
+ err = fastrpc_init_create_process(fl, argp);
+ break;
+ case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
+ err = fastrpc_dmabuf_alloc(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)
+{
+ struct fastrpc_channel_ctx *cctx;
+ struct fastrpc_session_ctx *sess;
+ struct device *dev = &pdev->dev;
+ int i, sessions = 0;
+ unsigned long flags;
+ int rc;
+
+ cctx = dev_get_drvdata(dev->parent);
+ if (!cctx)
+ return -EINVAL;
+
+ of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ sess = &cctx->session[cctx->sesscount];
+ sess->used = false;
+ sess->valid = true;
+ sess->dev = dev;
+ dev_set_drvdata(dev, sess);
+
+ if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
+ dev_info(dev, "FastRPC Session ID not specified in DT\n");
+
+ if (sessions > 0) {
+ struct fastrpc_session_ctx *dup_sess;
+
+ for (i = 1; i < sessions; i++) {
+ if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
+ break;
+ dup_sess = &cctx->session[cctx->sesscount];
+ memcpy(dup_sess, sess, sizeof(*dup_sess));
+ }
+ }
+ cctx->sesscount++;
+ spin_unlock_irqrestore(&cctx->lock, flags);
+ rc = dma_set_mask(dev, DMA_BIT_MASK(32));
+ if (rc) {
+ dev_err(dev, "32-bit DMA enable failed\n");
+ return rc;
+ }
+
+ return 0;
+}
+
+static int fastrpc_cb_remove(struct platform_device *pdev)
+{
+ struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
+ struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
+ if (cctx->session[i].sid == sess->sid) {
+ cctx->session[i].valid = false;
+ cctx->sesscount--;
+ }
+ }
+ spin_unlock_irqrestore(&cctx->lock, flags);
+
+ return 0;
+}
+
+static const struct of_device_id fastrpc_match_table[] = {
+ { .compatible = "qcom,fastrpc-compute-cb", },
+ {}
+};
+
+static struct platform_driver fastrpc_cb_driver = {
+ .probe = fastrpc_cb_probe,
+ .remove = fastrpc_cb_remove,
+ .driver = {
+ .name = "qcom,fastrpc-cb",
+ .of_match_table = fastrpc_match_table,
+ .suppress_bind_attrs = true,
+ },
+};
+
+static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
+{
+ struct device *rdev = &rpdev->dev;
+ struct fastrpc_channel_ctx *data;
+ int i, err, domain_id = -1;
+ const char *domain;
+
+ err = of_property_read_string(rdev->of_node, "label", &domain);
+ if (err) {
+ dev_info(rdev, "FastRPC Domain not specified in DT\n");
+ return err;
+ }
+
+ for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
+ if (!strcmp(domains[i], domain)) {
+ domain_id = i;
+ break;
+ }
+ }
+
+ if (domain_id < 0) {
+ dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
+ return -EINVAL;
+ }
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->miscdev.minor = MISC_DYNAMIC_MINOR;
+ data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s",
+ domains[domain_id]);
+ data->miscdev.fops = &fastrpc_fops;
+ err = misc_register(&data->miscdev);
+ if (err)
+ return err;
+
+ kref_init(&data->refcount);
+
+ dev_set_drvdata(&rpdev->dev, data);
+ dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
+ INIT_LIST_HEAD(&data->users);
+ spin_lock_init(&data->lock);
+ idr_init(&data->ctx_idr);
+ data->domain_id = domain_id;
+ data->rpdev = rpdev;
+
+ 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;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cctx->lock, flags);
+ list_for_each_entry(user, &cctx->users, user)
+ fastrpc_notify_users(user);
+ spin_unlock_irqrestore(&cctx->lock, flags);
+
+ misc_deregister(&cctx->miscdev);
+ of_platform_depopulate(&rpdev->dev);
+
+ cctx->rpdev = NULL;
+ fastrpc_channel_ctx_put(cctx);
+}
+
+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);
+
+ /*
+ * The DMA buffer associated with the context cannot be freed in
+ * interrupt context so schedule it through a worker thread to
+ * avoid a kernel BUG.
+ */
+ schedule_work(&ctx->put_work);
+
+ return 0;
+}
+
+static const struct of_device_id fastrpc_rpmsg_of_match[] = {
+ { .compatible = "qcom,fastrpc" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
+
+static struct rpmsg_driver fastrpc_driver = {
+ .probe = fastrpc_rpmsg_probe,
+ .remove = fastrpc_rpmsg_remove,
+ .callback = fastrpc_rpmsg_callback,
+ .drv = {
+ .name = "qcom,fastrpc",
+ .of_match_table = fastrpc_rpmsg_of_match,
+ },
+};
+
+static int fastrpc_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&fastrpc_cb_driver);
+ if (ret < 0) {
+ pr_err("fastrpc: failed to register cb driver\n");
+ return ret;
+ }
+
+ ret = register_rpmsg_driver(&fastrpc_driver);
+ if (ret < 0) {
+ pr_err("fastrpc: failed to register rpmsg driver\n");
+ platform_driver_unregister(&fastrpc_cb_driver);
+ return ret;
+ }
+
+ return 0;
+}
+module_init(fastrpc_init);
+
+static void fastrpc_exit(void)
+{
+ platform_driver_unregister(&fastrpc_cb_driver);
+ unregister_rpmsg_driver(&fastrpc_driver);
+}
+module_exit(fastrpc_exit);
+
+MODULE_LICENSE("GPL v2");