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- // 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 (2 * 1024 * 1024)
- #define FASTRPC_DEVICE_NAME "fastrpc"
- #define ADSP_MMAP_ADD_PAGES 0x1000
- /* 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_MMAP 4
- #define FASTRPC_RMID_INIT_MUNMAP 5
- #define FASTRPC_RMID_INIT_CREATE 6
- #define FASTRPC_RMID_INIT_CREATE_ATTR 7
- #define FASTRPC_RMID_INIT_CREATE_STATIC 8
- /* Protection Domain(PD) ids */
- #define AUDIO_PD (0) /* also GUEST_OS PD? */
- #define USER_PD (1)
- #define SENSORS_PD (2)
- #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_mmap_rsp_msg {
- u64 vaddr;
- };
- struct fastrpc_mmap_req_msg {
- s32 pgid;
- u32 flags;
- u64 vaddr;
- s32 num;
- };
- struct fastrpc_munmap_req_msg {
- s32 pgid;
- u64 vaddr;
- u64 size;
- };
- 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;
- /* mmap support */
- struct list_head node; /* list of user requested mmaps */
- uintptr_t raddr;
- };
- 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 list_head mmaps;
- 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);
- INIT_LIST_HEAD(&buf->node);
- mutex_init(&buf->lock);
- buf->fl = fl;
- buf->virt = NULL;
- buf->phys = 0;
- buf->size = size;
- buf->dev = dev;
- buf->raddr = 0;
- 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;
- int ret;
- table = &a->sgt;
- ret = dma_map_sgtable(attachment->dev, table, dir, 0);
- if (ret)
- table = ERR_PTR(ret);
- return table;
- }
- static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
- struct sg_table *table,
- enum dma_data_direction dir)
- {
- dma_unmap_sgtable(attach->dev, table, dir, 0);
- }
- 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_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,
- .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 oix;
- size = ALIGN(metalen, FASTRPC_ALIGN);
- for (oix = 0; oix < ctx->nbufs; oix++) {
- int i = ctx->olaps[oix].raix;
- if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
- if (ctx->olaps[oix].offset == 0)
- size = ALIGN(size, FASTRPC_ALIGN);
- size += (ctx->olaps[oix].mend - ctx->olaps[oix].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;
- mmap_read_lock(current->mm);
- vma = find_vma(current->mm, ctx->args[i].ptr);
- if (vma)
- pages[i].addr += ctx->args[i].ptr -
- vma->vm_start;
- mmap_read_unlock(current->mm);
- 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;
- int ret;
- 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);
- ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
- if (ret)
- fastrpc_context_put(ctx);
- return ret;
- }
- 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;
- if (handle == FASTRPC_INIT_HANDLE && !kernel) {
- dev_warn_ratelimited(fl->sctx->dev, "user app trying to send a kernel RPC message (%d)\n", handle);
- return -EPERM;
- }
- 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;
- if (kernel) {
- if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
- err = -ETIMEDOUT;
- } else {
- 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:
- if (err != -ERESTARTSYS && err != -ETIMEDOUT) {
- /* We are done with this compute context */
- 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 = USER_PD;
- 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;
- struct fastrpc_buf *buf, *b;
- 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);
- }
- list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
- list_del(&buf->node);
- fastrpc_buf_free(buf);
- }
- 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->mmaps);
- 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))) {
- /*
- * The usercopy failed, but we can't do much about it, as
- * dma_buf_fd() already called fd_install() and made the
- * file descriptor accessible for the current process. It
- * might already be closed and dmabuf no longer valid when
- * we reach this point. Therefore "leak" the fd and rely on
- * the process exit path to do any required cleanup.
- */
- return -EFAULT;
- }
- return 0;
- }
- static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
- {
- 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 = pd;
- 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 int fastrpc_req_munmap_impl(struct fastrpc_user *fl,
- struct fastrpc_req_munmap *req)
- {
- struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
- struct fastrpc_buf *buf, *b;
- struct fastrpc_munmap_req_msg req_msg;
- struct device *dev = fl->sctx->dev;
- int err;
- u32 sc;
- spin_lock(&fl->lock);
- list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
- if ((buf->raddr == req->vaddrout) && (buf->size == req->size))
- break;
- buf = NULL;
- }
- spin_unlock(&fl->lock);
- if (!buf) {
- dev_err(dev, "mmap not in list\n");
- return -EINVAL;
- }
- req_msg.pgid = fl->tgid;
- req_msg.size = buf->size;
- req_msg.vaddr = buf->raddr;
- args[0].ptr = (u64) (uintptr_t) &req_msg;
- args[0].length = sizeof(req_msg);
- sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0);
- err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
- &args[0]);
- if (!err) {
- dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr);
- spin_lock(&fl->lock);
- list_del(&buf->node);
- spin_unlock(&fl->lock);
- fastrpc_buf_free(buf);
- } else {
- dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr);
- }
- return err;
- }
- static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp)
- {
- struct fastrpc_req_munmap req;
- if (copy_from_user(&req, argp, sizeof(req)))
- return -EFAULT;
- return fastrpc_req_munmap_impl(fl, &req);
- }
- static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
- {
- struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } };
- struct fastrpc_buf *buf = NULL;
- struct fastrpc_mmap_req_msg req_msg;
- struct fastrpc_mmap_rsp_msg rsp_msg;
- struct fastrpc_req_munmap req_unmap;
- struct fastrpc_phy_page pages;
- struct fastrpc_req_mmap req;
- struct device *dev = fl->sctx->dev;
- int err;
- u32 sc;
- if (copy_from_user(&req, argp, sizeof(req)))
- return -EFAULT;
- if (req.flags != ADSP_MMAP_ADD_PAGES) {
- dev_err(dev, "flag not supported 0x%x\n", req.flags);
- return -EINVAL;
- }
- if (req.vaddrin) {
- dev_err(dev, "adding user allocated pages is not supported\n");
- return -EINVAL;
- }
- err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
- if (err) {
- dev_err(dev, "failed to allocate buffer\n");
- return err;
- }
- req_msg.pgid = fl->tgid;
- req_msg.flags = req.flags;
- req_msg.vaddr = req.vaddrin;
- req_msg.num = sizeof(pages);
- args[0].ptr = (u64) (uintptr_t) &req_msg;
- args[0].length = sizeof(req_msg);
- pages.addr = buf->phys;
- pages.size = buf->size;
- args[1].ptr = (u64) (uintptr_t) &pages;
- args[1].length = sizeof(pages);
- args[2].ptr = (u64) (uintptr_t) &rsp_msg;
- args[2].length = sizeof(rsp_msg);
- sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1);
- err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
- &args[0]);
- if (err) {
- dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size);
- goto err_invoke;
- }
- /* update the buffer to be able to deallocate the memory on the DSP */
- buf->raddr = (uintptr_t) rsp_msg.vaddr;
- /* let the client know the address to use */
- req.vaddrout = rsp_msg.vaddr;
- spin_lock(&fl->lock);
- list_add_tail(&buf->node, &fl->mmaps);
- spin_unlock(&fl->lock);
- if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
- /* unmap the memory and release the buffer */
- req_unmap.vaddrout = buf->raddr;
- req_unmap.size = buf->size;
- fastrpc_req_munmap_impl(fl, &req_unmap);
- return -EFAULT;
- }
- dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n",
- buf->raddr, buf->size);
- return 0;
- err_invoke:
- fastrpc_buf_free(buf);
- 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, AUDIO_PD);
- break;
- case FASTRPC_IOCTL_INIT_ATTACH_SNS:
- err = fastrpc_init_attach(fl, SENSORS_PD);
- 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;
- case FASTRPC_IOCTL_MMAP:
- err = fastrpc_req_mmap(fl, argp);
- break;
- case FASTRPC_IOCTL_MUNMAP:
- err = fastrpc_req_munmap(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 = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
- domains[domain_id]);
- data->miscdev.fops = &fastrpc_fops;
- err = misc_register(&data->miscdev);
- if (err) {
- kfree(data);
- 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");
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