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0001 // SPDX-License-Identifier: GPL-2.0
0002 // Copyright (c) 2011-2018, The Linux Foundation. All rights reserved.
0003 // Copyright (c) 2018, Linaro Limited
0004 
0005 #include <linux/completion.h>
0006 #include <linux/device.h>
0007 #include <linux/dma-buf.h>
0008 #include <linux/dma-mapping.h>
0009 #include <linux/idr.h>
0010 #include <linux/list.h>
0011 #include <linux/miscdevice.h>
0012 #include <linux/module.h>
0013 #include <linux/of_address.h>
0014 #include <linux/of.h>
0015 #include <linux/sort.h>
0016 #include <linux/of_platform.h>
0017 #include <linux/rpmsg.h>
0018 #include <linux/scatterlist.h>
0019 #include <linux/slab.h>
0020 #include <linux/qcom_scm.h>
0021 #include <uapi/misc/fastrpc.h>
0022 
0023 #define ADSP_DOMAIN_ID (0)
0024 #define MDSP_DOMAIN_ID (1)
0025 #define SDSP_DOMAIN_ID (2)
0026 #define CDSP_DOMAIN_ID (3)
0027 #define FASTRPC_DEV_MAX     4 /* adsp, mdsp, slpi, cdsp*/
0028 #define FASTRPC_MAX_SESSIONS    14
0029 #define FASTRPC_MAX_VMIDS   16
0030 #define FASTRPC_ALIGN       128
0031 #define FASTRPC_MAX_FDLIST  16
0032 #define FASTRPC_MAX_CRCLIST 64
0033 #define FASTRPC_PHYS(p) ((p) & 0xffffffff)
0034 #define FASTRPC_CTX_MAX (256)
0035 #define FASTRPC_INIT_HANDLE 1
0036 #define FASTRPC_DSP_UTILITIES_HANDLE    2
0037 #define FASTRPC_CTXID_MASK (0xFF0)
0038 #define INIT_FILELEN_MAX (2 * 1024 * 1024)
0039 #define FASTRPC_DEVICE_NAME "fastrpc"
0040 #define ADSP_MMAP_ADD_PAGES 0x1000
0041 #define DSP_UNSUPPORTED_API (0x80000414)
0042 /* MAX NUMBER of DSP ATTRIBUTES SUPPORTED */
0043 #define FASTRPC_MAX_DSP_ATTRIBUTES (256)
0044 #define FASTRPC_MAX_DSP_ATTRIBUTES_LEN (sizeof(u32) * FASTRPC_MAX_DSP_ATTRIBUTES)
0045 
0046 /* Retrives number of input buffers from the scalars parameter */
0047 #define REMOTE_SCALARS_INBUFS(sc)   (((sc) >> 16) & 0x0ff)
0048 
0049 /* Retrives number of output buffers from the scalars parameter */
0050 #define REMOTE_SCALARS_OUTBUFS(sc)  (((sc) >> 8) & 0x0ff)
0051 
0052 /* Retrives number of input handles from the scalars parameter */
0053 #define REMOTE_SCALARS_INHANDLES(sc)    (((sc) >> 4) & 0x0f)
0054 
0055 /* Retrives number of output handles from the scalars parameter */
0056 #define REMOTE_SCALARS_OUTHANDLES(sc)   ((sc) & 0x0f)
0057 
0058 #define REMOTE_SCALARS_LENGTH(sc)   (REMOTE_SCALARS_INBUFS(sc) +   \
0059                      REMOTE_SCALARS_OUTBUFS(sc) +  \
0060                      REMOTE_SCALARS_INHANDLES(sc)+ \
0061                      REMOTE_SCALARS_OUTHANDLES(sc))
0062 #define FASTRPC_BUILD_SCALARS(attr, method, in, out, oin, oout)  \
0063                 (((attr & 0x07) << 29) |        \
0064                 ((method & 0x1f) << 24) |   \
0065                 ((in & 0xff) << 16) |       \
0066                 ((out & 0xff) <<  8) |      \
0067                 ((oin & 0x0f) <<  4) |      \
0068                 (oout & 0x0f))
0069 
0070 #define FASTRPC_SCALARS(method, in, out) \
0071         FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)
0072 
0073 #define FASTRPC_CREATE_PROCESS_NARGS    6
0074 /* Remote Method id table */
0075 #define FASTRPC_RMID_INIT_ATTACH    0
0076 #define FASTRPC_RMID_INIT_RELEASE   1
0077 #define FASTRPC_RMID_INIT_MMAP      4
0078 #define FASTRPC_RMID_INIT_MUNMAP    5
0079 #define FASTRPC_RMID_INIT_CREATE    6
0080 #define FASTRPC_RMID_INIT_CREATE_ATTR   7
0081 #define FASTRPC_RMID_INIT_CREATE_STATIC 8
0082 #define FASTRPC_RMID_INIT_MEM_MAP      10
0083 #define FASTRPC_RMID_INIT_MEM_UNMAP    11
0084 
0085 /* Protection Domain(PD) ids */
0086 #define AUDIO_PD    (0) /* also GUEST_OS PD? */
0087 #define USER_PD     (1)
0088 #define SENSORS_PD  (2)
0089 
0090 #define miscdev_to_fdevice(d) container_of(d, struct fastrpc_device, miscdev)
0091 
0092 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
0093                         "sdsp", "cdsp"};
0094 struct fastrpc_phy_page {
0095     u64 addr;       /* physical address */
0096     u64 size;       /* size of contiguous region */
0097 };
0098 
0099 struct fastrpc_invoke_buf {
0100     u32 num;        /* number of contiguous regions */
0101     u32 pgidx;      /* index to start of contiguous region */
0102 };
0103 
0104 struct fastrpc_remote_dmahandle {
0105     s32 fd;     /* dma handle fd */
0106     u32 offset; /* dma handle offset */
0107     u32 len;    /* dma handle length */
0108 };
0109 
0110 struct fastrpc_remote_buf {
0111     u64 pv;     /* buffer pointer */
0112     u64 len;    /* length of buffer */
0113 };
0114 
0115 union fastrpc_remote_arg {
0116     struct fastrpc_remote_buf buf;
0117     struct fastrpc_remote_dmahandle dma;
0118 };
0119 
0120 struct fastrpc_mmap_rsp_msg {
0121     u64 vaddr;
0122 };
0123 
0124 struct fastrpc_mmap_req_msg {
0125     s32 pgid;
0126     u32 flags;
0127     u64 vaddr;
0128     s32 num;
0129 };
0130 
0131 struct fastrpc_mem_map_req_msg {
0132     s32 pgid;
0133     s32 fd;
0134     s32 offset;
0135     u32 flags;
0136     u64 vaddrin;
0137     s32 num;
0138     s32 data_len;
0139 };
0140 
0141 struct fastrpc_munmap_req_msg {
0142     s32 pgid;
0143     u64 vaddr;
0144     u64 size;
0145 };
0146 
0147 struct fastrpc_mem_unmap_req_msg {
0148     s32 pgid;
0149     s32 fd;
0150     u64 vaddrin;
0151     u64 len;
0152 };
0153 
0154 struct fastrpc_msg {
0155     int pid;        /* process group id */
0156     int tid;        /* thread id */
0157     u64 ctx;        /* invoke caller context */
0158     u32 handle; /* handle to invoke */
0159     u32 sc;     /* scalars structure describing the data */
0160     u64 addr;       /* physical address */
0161     u64 size;       /* size of contiguous region */
0162 };
0163 
0164 struct fastrpc_invoke_rsp {
0165     u64 ctx;        /* invoke caller context */
0166     int retval;     /* invoke return value */
0167 };
0168 
0169 struct fastrpc_buf_overlap {
0170     u64 start;
0171     u64 end;
0172     int raix;
0173     u64 mstart;
0174     u64 mend;
0175     u64 offset;
0176 };
0177 
0178 struct fastrpc_buf {
0179     struct fastrpc_user *fl;
0180     struct dma_buf *dmabuf;
0181     struct device *dev;
0182     void *virt;
0183     u64 phys;
0184     u64 size;
0185     /* Lock for dma buf attachments */
0186     struct mutex lock;
0187     struct list_head attachments;
0188     /* mmap support */
0189     struct list_head node; /* list of user requested mmaps */
0190     uintptr_t raddr;
0191 };
0192 
0193 struct fastrpc_dma_buf_attachment {
0194     struct device *dev;
0195     struct sg_table sgt;
0196     struct list_head node;
0197 };
0198 
0199 struct fastrpc_map {
0200     struct list_head node;
0201     struct fastrpc_user *fl;
0202     int fd;
0203     struct dma_buf *buf;
0204     struct sg_table *table;
0205     struct dma_buf_attachment *attach;
0206     u64 phys;
0207     u64 size;
0208     void *va;
0209     u64 len;
0210     u64 raddr;
0211     u32 attr;
0212     struct kref refcount;
0213 };
0214 
0215 struct fastrpc_invoke_ctx {
0216     int nscalars;
0217     int nbufs;
0218     int retval;
0219     int pid;
0220     int tgid;
0221     u32 sc;
0222     u32 *crc;
0223     u64 ctxid;
0224     u64 msg_sz;
0225     struct kref refcount;
0226     struct list_head node; /* list of ctxs */
0227     struct completion work;
0228     struct work_struct put_work;
0229     struct fastrpc_msg msg;
0230     struct fastrpc_user *fl;
0231     union fastrpc_remote_arg *rpra;
0232     struct fastrpc_map **maps;
0233     struct fastrpc_buf *buf;
0234     struct fastrpc_invoke_args *args;
0235     struct fastrpc_buf_overlap *olaps;
0236     struct fastrpc_channel_ctx *cctx;
0237 };
0238 
0239 struct fastrpc_session_ctx {
0240     struct device *dev;
0241     int sid;
0242     bool used;
0243     bool valid;
0244 };
0245 
0246 struct fastrpc_channel_ctx {
0247     int domain_id;
0248     int sesscount;
0249     int vmcount;
0250     u32 perms;
0251     struct qcom_scm_vmperm vmperms[FASTRPC_MAX_VMIDS];
0252     struct rpmsg_device *rpdev;
0253     struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
0254     spinlock_t lock;
0255     struct idr ctx_idr;
0256     struct list_head users;
0257     struct kref refcount;
0258     /* Flag if dsp attributes are cached */
0259     bool valid_attributes;
0260     u32 dsp_attributes[FASTRPC_MAX_DSP_ATTRIBUTES];
0261     struct fastrpc_device *secure_fdevice;
0262     struct fastrpc_device *fdevice;
0263     bool secure;
0264     bool unsigned_support;
0265 };
0266 
0267 struct fastrpc_device {
0268     struct fastrpc_channel_ctx *cctx;
0269     struct miscdevice miscdev;
0270     bool secure;
0271 };
0272 
0273 struct fastrpc_user {
0274     struct list_head user;
0275     struct list_head maps;
0276     struct list_head pending;
0277     struct list_head mmaps;
0278 
0279     struct fastrpc_channel_ctx *cctx;
0280     struct fastrpc_session_ctx *sctx;
0281     struct fastrpc_buf *init_mem;
0282 
0283     int tgid;
0284     int pd;
0285     bool is_secure_dev;
0286     /* Lock for lists */
0287     spinlock_t lock;
0288     /* lock for allocations */
0289     struct mutex mutex;
0290 };
0291 
0292 static void fastrpc_free_map(struct kref *ref)
0293 {
0294     struct fastrpc_map *map;
0295 
0296     map = container_of(ref, struct fastrpc_map, refcount);
0297 
0298     if (map->table) {
0299         if (map->attr & FASTRPC_ATTR_SECUREMAP) {
0300             struct qcom_scm_vmperm perm;
0301             int err = 0;
0302 
0303             perm.vmid = QCOM_SCM_VMID_HLOS;
0304             perm.perm = QCOM_SCM_PERM_RWX;
0305             err = qcom_scm_assign_mem(map->phys, map->size,
0306                 &(map->fl->cctx->vmperms[0].vmid), &perm, 1);
0307             if (err) {
0308                 dev_err(map->fl->sctx->dev, "Failed to assign memory phys 0x%llx size 0x%llx err %d",
0309                         map->phys, map->size, err);
0310                 return;
0311             }
0312         }
0313         dma_buf_unmap_attachment(map->attach, map->table,
0314                      DMA_BIDIRECTIONAL);
0315         dma_buf_detach(map->buf, map->attach);
0316         dma_buf_put(map->buf);
0317     }
0318 
0319     kfree(map);
0320 }
0321 
0322 static void fastrpc_map_put(struct fastrpc_map *map)
0323 {
0324     if (map)
0325         kref_put(&map->refcount, fastrpc_free_map);
0326 }
0327 
0328 static void fastrpc_map_get(struct fastrpc_map *map)
0329 {
0330     if (map)
0331         kref_get(&map->refcount);
0332 }
0333 
0334 
0335 static int fastrpc_map_lookup(struct fastrpc_user *fl, int fd,
0336                 struct fastrpc_map **ppmap)
0337 {
0338     struct fastrpc_map *map = NULL;
0339 
0340     mutex_lock(&fl->mutex);
0341     list_for_each_entry(map, &fl->maps, node) {
0342         if (map->fd == fd) {
0343             *ppmap = map;
0344             mutex_unlock(&fl->mutex);
0345             return 0;
0346         }
0347     }
0348     mutex_unlock(&fl->mutex);
0349 
0350     return -ENOENT;
0351 }
0352 
0353 static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
0354                 struct fastrpc_map **ppmap)
0355 {
0356     int ret = fastrpc_map_lookup(fl, fd, ppmap);
0357 
0358     if (!ret)
0359         fastrpc_map_get(*ppmap);
0360 
0361     return ret;
0362 }
0363 
0364 static void fastrpc_buf_free(struct fastrpc_buf *buf)
0365 {
0366     dma_free_coherent(buf->dev, buf->size, buf->virt,
0367               FASTRPC_PHYS(buf->phys));
0368     kfree(buf);
0369 }
0370 
0371 static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
0372                  u64 size, struct fastrpc_buf **obuf)
0373 {
0374     struct fastrpc_buf *buf;
0375 
0376     buf = kzalloc(sizeof(*buf), GFP_KERNEL);
0377     if (!buf)
0378         return -ENOMEM;
0379 
0380     INIT_LIST_HEAD(&buf->attachments);
0381     INIT_LIST_HEAD(&buf->node);
0382     mutex_init(&buf->lock);
0383 
0384     buf->fl = fl;
0385     buf->virt = NULL;
0386     buf->phys = 0;
0387     buf->size = size;
0388     buf->dev = dev;
0389     buf->raddr = 0;
0390 
0391     buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
0392                        GFP_KERNEL);
0393     if (!buf->virt) {
0394         mutex_destroy(&buf->lock);
0395         kfree(buf);
0396         return -ENOMEM;
0397     }
0398 
0399     if (fl->sctx && fl->sctx->sid)
0400         buf->phys += ((u64)fl->sctx->sid << 32);
0401 
0402     *obuf = buf;
0403 
0404     return 0;
0405 }
0406 
0407 static void fastrpc_channel_ctx_free(struct kref *ref)
0408 {
0409     struct fastrpc_channel_ctx *cctx;
0410 
0411     cctx = container_of(ref, struct fastrpc_channel_ctx, refcount);
0412 
0413     kfree(cctx);
0414 }
0415 
0416 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
0417 {
0418     kref_get(&cctx->refcount);
0419 }
0420 
0421 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
0422 {
0423     kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
0424 }
0425 
0426 static void fastrpc_context_free(struct kref *ref)
0427 {
0428     struct fastrpc_invoke_ctx *ctx;
0429     struct fastrpc_channel_ctx *cctx;
0430     unsigned long flags;
0431     int i;
0432 
0433     ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
0434     cctx = ctx->cctx;
0435 
0436     for (i = 0; i < ctx->nbufs; i++)
0437         fastrpc_map_put(ctx->maps[i]);
0438 
0439     if (ctx->buf)
0440         fastrpc_buf_free(ctx->buf);
0441 
0442     spin_lock_irqsave(&cctx->lock, flags);
0443     idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
0444     spin_unlock_irqrestore(&cctx->lock, flags);
0445 
0446     kfree(ctx->maps);
0447     kfree(ctx->olaps);
0448     kfree(ctx);
0449 
0450     fastrpc_channel_ctx_put(cctx);
0451 }
0452 
0453 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
0454 {
0455     kref_get(&ctx->refcount);
0456 }
0457 
0458 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
0459 {
0460     kref_put(&ctx->refcount, fastrpc_context_free);
0461 }
0462 
0463 static void fastrpc_context_put_wq(struct work_struct *work)
0464 {
0465     struct fastrpc_invoke_ctx *ctx =
0466             container_of(work, struct fastrpc_invoke_ctx, put_work);
0467 
0468     fastrpc_context_put(ctx);
0469 }
0470 
0471 #define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
0472 static int olaps_cmp(const void *a, const void *b)
0473 {
0474     struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a;
0475     struct fastrpc_buf_overlap *pb = (struct fastrpc_buf_overlap *)b;
0476     /* sort with lowest starting buffer first */
0477     int st = CMP(pa->start, pb->start);
0478     /* sort with highest ending buffer first */
0479     int ed = CMP(pb->end, pa->end);
0480 
0481     return st == 0 ? ed : st;
0482 }
0483 
0484 static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx)
0485 {
0486     u64 max_end = 0;
0487     int i;
0488 
0489     for (i = 0; i < ctx->nbufs; ++i) {
0490         ctx->olaps[i].start = ctx->args[i].ptr;
0491         ctx->olaps[i].end = ctx->olaps[i].start + ctx->args[i].length;
0492         ctx->olaps[i].raix = i;
0493     }
0494 
0495     sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL);
0496 
0497     for (i = 0; i < ctx->nbufs; ++i) {
0498         /* Falling inside previous range */
0499         if (ctx->olaps[i].start < max_end) {
0500             ctx->olaps[i].mstart = max_end;
0501             ctx->olaps[i].mend = ctx->olaps[i].end;
0502             ctx->olaps[i].offset = max_end - ctx->olaps[i].start;
0503 
0504             if (ctx->olaps[i].end > max_end) {
0505                 max_end = ctx->olaps[i].end;
0506             } else {
0507                 ctx->olaps[i].mend = 0;
0508                 ctx->olaps[i].mstart = 0;
0509             }
0510 
0511         } else  {
0512             ctx->olaps[i].mend = ctx->olaps[i].end;
0513             ctx->olaps[i].mstart = ctx->olaps[i].start;
0514             ctx->olaps[i].offset = 0;
0515             max_end = ctx->olaps[i].end;
0516         }
0517     }
0518 }
0519 
0520 static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
0521             struct fastrpc_user *user, u32 kernel, u32 sc,
0522             struct fastrpc_invoke_args *args)
0523 {
0524     struct fastrpc_channel_ctx *cctx = user->cctx;
0525     struct fastrpc_invoke_ctx *ctx = NULL;
0526     unsigned long flags;
0527     int ret;
0528 
0529     ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
0530     if (!ctx)
0531         return ERR_PTR(-ENOMEM);
0532 
0533     INIT_LIST_HEAD(&ctx->node);
0534     ctx->fl = user;
0535     ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
0536     ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
0537              REMOTE_SCALARS_OUTBUFS(sc);
0538 
0539     if (ctx->nscalars) {
0540         ctx->maps = kcalloc(ctx->nscalars,
0541                     sizeof(*ctx->maps), GFP_KERNEL);
0542         if (!ctx->maps) {
0543             kfree(ctx);
0544             return ERR_PTR(-ENOMEM);
0545         }
0546         ctx->olaps = kcalloc(ctx->nscalars,
0547                     sizeof(*ctx->olaps), GFP_KERNEL);
0548         if (!ctx->olaps) {
0549             kfree(ctx->maps);
0550             kfree(ctx);
0551             return ERR_PTR(-ENOMEM);
0552         }
0553         ctx->args = args;
0554         fastrpc_get_buff_overlaps(ctx);
0555     }
0556 
0557     /* Released in fastrpc_context_put() */
0558     fastrpc_channel_ctx_get(cctx);
0559 
0560     ctx->sc = sc;
0561     ctx->retval = -1;
0562     ctx->pid = current->pid;
0563     ctx->tgid = user->tgid;
0564     ctx->cctx = cctx;
0565     init_completion(&ctx->work);
0566     INIT_WORK(&ctx->put_work, fastrpc_context_put_wq);
0567 
0568     spin_lock(&user->lock);
0569     list_add_tail(&ctx->node, &user->pending);
0570     spin_unlock(&user->lock);
0571 
0572     spin_lock_irqsave(&cctx->lock, flags);
0573     ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
0574                    FASTRPC_CTX_MAX, GFP_ATOMIC);
0575     if (ret < 0) {
0576         spin_unlock_irqrestore(&cctx->lock, flags);
0577         goto err_idr;
0578     }
0579     ctx->ctxid = ret << 4;
0580     spin_unlock_irqrestore(&cctx->lock, flags);
0581 
0582     kref_init(&ctx->refcount);
0583 
0584     return ctx;
0585 err_idr:
0586     spin_lock(&user->lock);
0587     list_del(&ctx->node);
0588     spin_unlock(&user->lock);
0589     fastrpc_channel_ctx_put(cctx);
0590     kfree(ctx->maps);
0591     kfree(ctx->olaps);
0592     kfree(ctx);
0593 
0594     return ERR_PTR(ret);
0595 }
0596 
0597 static struct sg_table *
0598 fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
0599             enum dma_data_direction dir)
0600 {
0601     struct fastrpc_dma_buf_attachment *a = attachment->priv;
0602     struct sg_table *table;
0603     int ret;
0604 
0605     table = &a->sgt;
0606 
0607     ret = dma_map_sgtable(attachment->dev, table, dir, 0);
0608     if (ret)
0609         table = ERR_PTR(ret);
0610     return table;
0611 }
0612 
0613 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
0614                   struct sg_table *table,
0615                   enum dma_data_direction dir)
0616 {
0617     dma_unmap_sgtable(attach->dev, table, dir, 0);
0618 }
0619 
0620 static void fastrpc_release(struct dma_buf *dmabuf)
0621 {
0622     struct fastrpc_buf *buffer = dmabuf->priv;
0623 
0624     fastrpc_buf_free(buffer);
0625 }
0626 
0627 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
0628                   struct dma_buf_attachment *attachment)
0629 {
0630     struct fastrpc_dma_buf_attachment *a;
0631     struct fastrpc_buf *buffer = dmabuf->priv;
0632     int ret;
0633 
0634     a = kzalloc(sizeof(*a), GFP_KERNEL);
0635     if (!a)
0636         return -ENOMEM;
0637 
0638     ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
0639                   FASTRPC_PHYS(buffer->phys), buffer->size);
0640     if (ret < 0) {
0641         dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
0642         kfree(a);
0643         return -EINVAL;
0644     }
0645 
0646     a->dev = attachment->dev;
0647     INIT_LIST_HEAD(&a->node);
0648     attachment->priv = a;
0649 
0650     mutex_lock(&buffer->lock);
0651     list_add(&a->node, &buffer->attachments);
0652     mutex_unlock(&buffer->lock);
0653 
0654     return 0;
0655 }
0656 
0657 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
0658                     struct dma_buf_attachment *attachment)
0659 {
0660     struct fastrpc_dma_buf_attachment *a = attachment->priv;
0661     struct fastrpc_buf *buffer = dmabuf->priv;
0662 
0663     mutex_lock(&buffer->lock);
0664     list_del(&a->node);
0665     mutex_unlock(&buffer->lock);
0666     sg_free_table(&a->sgt);
0667     kfree(a);
0668 }
0669 
0670 static int fastrpc_vmap(struct dma_buf *dmabuf, struct iosys_map *map)
0671 {
0672     struct fastrpc_buf *buf = dmabuf->priv;
0673 
0674     iosys_map_set_vaddr(map, buf->virt);
0675 
0676     return 0;
0677 }
0678 
0679 static int fastrpc_mmap(struct dma_buf *dmabuf,
0680             struct vm_area_struct *vma)
0681 {
0682     struct fastrpc_buf *buf = dmabuf->priv;
0683     size_t size = vma->vm_end - vma->vm_start;
0684 
0685     return dma_mmap_coherent(buf->dev, vma, buf->virt,
0686                  FASTRPC_PHYS(buf->phys), size);
0687 }
0688 
0689 static const struct dma_buf_ops fastrpc_dma_buf_ops = {
0690     .attach = fastrpc_dma_buf_attach,
0691     .detach = fastrpc_dma_buf_detatch,
0692     .map_dma_buf = fastrpc_map_dma_buf,
0693     .unmap_dma_buf = fastrpc_unmap_dma_buf,
0694     .mmap = fastrpc_mmap,
0695     .vmap = fastrpc_vmap,
0696     .release = fastrpc_release,
0697 };
0698 
0699 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
0700                   u64 len, u32 attr, struct fastrpc_map **ppmap)
0701 {
0702     struct fastrpc_session_ctx *sess = fl->sctx;
0703     struct fastrpc_map *map = NULL;
0704     int err = 0;
0705 
0706     if (!fastrpc_map_find(fl, fd, ppmap))
0707         return 0;
0708 
0709     map = kzalloc(sizeof(*map), GFP_KERNEL);
0710     if (!map)
0711         return -ENOMEM;
0712 
0713     INIT_LIST_HEAD(&map->node);
0714     map->fl = fl;
0715     map->fd = fd;
0716     map->buf = dma_buf_get(fd);
0717     if (IS_ERR(map->buf)) {
0718         err = PTR_ERR(map->buf);
0719         goto get_err;
0720     }
0721 
0722     map->attach = dma_buf_attach(map->buf, sess->dev);
0723     if (IS_ERR(map->attach)) {
0724         dev_err(sess->dev, "Failed to attach dmabuf\n");
0725         err = PTR_ERR(map->attach);
0726         goto attach_err;
0727     }
0728 
0729     map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
0730     if (IS_ERR(map->table)) {
0731         err = PTR_ERR(map->table);
0732         goto map_err;
0733     }
0734 
0735     map->phys = sg_dma_address(map->table->sgl);
0736     map->phys += ((u64)fl->sctx->sid << 32);
0737     map->size = len;
0738     map->va = sg_virt(map->table->sgl);
0739     map->len = len;
0740     kref_init(&map->refcount);
0741 
0742     if (attr & FASTRPC_ATTR_SECUREMAP) {
0743         /*
0744          * If subsystem VMIDs are defined in DTSI, then do
0745          * hyp_assign from HLOS to those VM(s)
0746          */
0747         unsigned int perms = BIT(QCOM_SCM_VMID_HLOS);
0748 
0749         map->attr = attr;
0750         err = qcom_scm_assign_mem(map->phys, (u64)map->size, &perms,
0751                 fl->cctx->vmperms, fl->cctx->vmcount);
0752         if (err) {
0753             dev_err(sess->dev, "Failed to assign memory with phys 0x%llx size 0x%llx err %d",
0754                     map->phys, map->size, err);
0755             goto map_err;
0756         }
0757     }
0758     spin_lock(&fl->lock);
0759     list_add_tail(&map->node, &fl->maps);
0760     spin_unlock(&fl->lock);
0761     *ppmap = map;
0762 
0763     return 0;
0764 
0765 map_err:
0766     dma_buf_detach(map->buf, map->attach);
0767 attach_err:
0768     dma_buf_put(map->buf);
0769 get_err:
0770     kfree(map);
0771 
0772     return err;
0773 }
0774 
0775 /*
0776  * Fastrpc payload buffer with metadata looks like:
0777  *
0778  * >>>>>>  START of METADATA <<<<<<<<<
0779  * +---------------------------------+
0780  * |           Arguments             |
0781  * | type:(union fastrpc_remote_arg)|
0782  * |             (0 - N)             |
0783  * +---------------------------------+
0784  * |         Invoke Buffer list      |
0785  * | type:(struct fastrpc_invoke_buf)|
0786  * |           (0 - N)               |
0787  * +---------------------------------+
0788  * |         Page info list          |
0789  * | type:(struct fastrpc_phy_page)  |
0790  * |             (0 - N)             |
0791  * +---------------------------------+
0792  * |         Optional info           |
0793  * |(can be specific to SoC/Firmware)|
0794  * +---------------------------------+
0795  * >>>>>>>>  END of METADATA <<<<<<<<<
0796  * +---------------------------------+
0797  * |         Inline ARGS             |
0798  * |            (0-N)                |
0799  * +---------------------------------+
0800  */
0801 
0802 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
0803 {
0804     int size = 0;
0805 
0806     size = (sizeof(struct fastrpc_remote_buf) +
0807         sizeof(struct fastrpc_invoke_buf) +
0808         sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
0809         sizeof(u64) * FASTRPC_MAX_FDLIST +
0810         sizeof(u32) * FASTRPC_MAX_CRCLIST;
0811 
0812     return size;
0813 }
0814 
0815 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
0816 {
0817     u64 size = 0;
0818     int oix;
0819 
0820     size = ALIGN(metalen, FASTRPC_ALIGN);
0821     for (oix = 0; oix < ctx->nbufs; oix++) {
0822         int i = ctx->olaps[oix].raix;
0823 
0824         if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
0825 
0826             if (ctx->olaps[oix].offset == 0)
0827                 size = ALIGN(size, FASTRPC_ALIGN);
0828 
0829             size += (ctx->olaps[oix].mend - ctx->olaps[oix].mstart);
0830         }
0831     }
0832 
0833     return size;
0834 }
0835 
0836 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
0837 {
0838     struct device *dev = ctx->fl->sctx->dev;
0839     int i, err;
0840 
0841     for (i = 0; i < ctx->nscalars; ++i) {
0842 
0843         if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
0844             ctx->args[i].length == 0)
0845             continue;
0846 
0847         err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
0848              ctx->args[i].length, ctx->args[i].attr, &ctx->maps[i]);
0849         if (err) {
0850             dev_err(dev, "Error Creating map %d\n", err);
0851             return -EINVAL;
0852         }
0853 
0854     }
0855     return 0;
0856 }
0857 
0858 static struct fastrpc_invoke_buf *fastrpc_invoke_buf_start(union fastrpc_remote_arg *pra, int len)
0859 {
0860     return (struct fastrpc_invoke_buf *)(&pra[len]);
0861 }
0862 
0863 static struct fastrpc_phy_page *fastrpc_phy_page_start(struct fastrpc_invoke_buf *buf, int len)
0864 {
0865     return (struct fastrpc_phy_page *)(&buf[len]);
0866 }
0867 
0868 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
0869 {
0870     struct device *dev = ctx->fl->sctx->dev;
0871     union fastrpc_remote_arg *rpra;
0872     struct fastrpc_invoke_buf *list;
0873     struct fastrpc_phy_page *pages;
0874     int inbufs, i, oix, err = 0;
0875     u64 len, rlen, pkt_size;
0876     u64 pg_start, pg_end;
0877     uintptr_t args;
0878     int metalen;
0879 
0880     inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
0881     metalen = fastrpc_get_meta_size(ctx);
0882     pkt_size = fastrpc_get_payload_size(ctx, metalen);
0883 
0884     err = fastrpc_create_maps(ctx);
0885     if (err)
0886         return err;
0887 
0888     ctx->msg_sz = pkt_size;
0889 
0890     err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
0891     if (err)
0892         return err;
0893 
0894     rpra = ctx->buf->virt;
0895     list = fastrpc_invoke_buf_start(rpra, ctx->nscalars);
0896     pages = fastrpc_phy_page_start(list, ctx->nscalars);
0897     args = (uintptr_t)ctx->buf->virt + metalen;
0898     rlen = pkt_size - metalen;
0899     ctx->rpra = rpra;
0900 
0901     for (oix = 0; oix < ctx->nbufs; ++oix) {
0902         int mlen;
0903 
0904         i = ctx->olaps[oix].raix;
0905         len = ctx->args[i].length;
0906 
0907         rpra[i].buf.pv = 0;
0908         rpra[i].buf.len = len;
0909         list[i].num = len ? 1 : 0;
0910         list[i].pgidx = i;
0911 
0912         if (!len)
0913             continue;
0914 
0915         if (ctx->maps[i]) {
0916             struct vm_area_struct *vma = NULL;
0917 
0918             rpra[i].buf.pv = (u64) ctx->args[i].ptr;
0919             pages[i].addr = ctx->maps[i]->phys;
0920 
0921             mmap_read_lock(current->mm);
0922             vma = find_vma(current->mm, ctx->args[i].ptr);
0923             if (vma)
0924                 pages[i].addr += ctx->args[i].ptr -
0925                          vma->vm_start;
0926             mmap_read_unlock(current->mm);
0927 
0928             pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
0929             pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
0930                   PAGE_SHIFT;
0931             pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
0932 
0933         } else {
0934 
0935             if (ctx->olaps[oix].offset == 0) {
0936                 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
0937                 args = ALIGN(args, FASTRPC_ALIGN);
0938             }
0939 
0940             mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
0941 
0942             if (rlen < mlen)
0943                 goto bail;
0944 
0945             rpra[i].buf.pv = args - ctx->olaps[oix].offset;
0946             pages[i].addr = ctx->buf->phys -
0947                     ctx->olaps[oix].offset +
0948                     (pkt_size - rlen);
0949             pages[i].addr = pages[i].addr & PAGE_MASK;
0950 
0951             pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
0952             pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
0953             pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
0954             args = args + mlen;
0955             rlen -= mlen;
0956         }
0957 
0958         if (i < inbufs && !ctx->maps[i]) {
0959             void *dst = (void *)(uintptr_t)rpra[i].buf.pv;
0960             void *src = (void *)(uintptr_t)ctx->args[i].ptr;
0961 
0962             if (!kernel) {
0963                 if (copy_from_user(dst, (void __user *)src,
0964                            len)) {
0965                     err = -EFAULT;
0966                     goto bail;
0967                 }
0968             } else {
0969                 memcpy(dst, src, len);
0970             }
0971         }
0972     }
0973 
0974     for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
0975         list[i].num = ctx->args[i].length ? 1 : 0;
0976         list[i].pgidx = i;
0977         if (ctx->maps[i]) {
0978             pages[i].addr = ctx->maps[i]->phys;
0979             pages[i].size = ctx->maps[i]->size;
0980         }
0981         rpra[i].dma.fd = ctx->args[i].fd;
0982         rpra[i].dma.len = ctx->args[i].length;
0983         rpra[i].dma.offset = (u64) ctx->args[i].ptr;
0984     }
0985 
0986 bail:
0987     if (err)
0988         dev_err(dev, "Error: get invoke args failed:%d\n", err);
0989 
0990     return err;
0991 }
0992 
0993 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
0994                 u32 kernel)
0995 {
0996     union fastrpc_remote_arg *rpra = ctx->rpra;
0997     struct fastrpc_user *fl = ctx->fl;
0998     struct fastrpc_map *mmap = NULL;
0999     struct fastrpc_invoke_buf *list;
1000     struct fastrpc_phy_page *pages;
1001     u64 *fdlist;
1002     int i, inbufs, outbufs, handles;
1003 
1004     inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
1005     outbufs = REMOTE_SCALARS_OUTBUFS(ctx->sc);
1006     handles = REMOTE_SCALARS_INHANDLES(ctx->sc) + REMOTE_SCALARS_OUTHANDLES(ctx->sc);
1007     list = fastrpc_invoke_buf_start(rpra, ctx->nscalars);
1008     pages = fastrpc_phy_page_start(list, ctx->nscalars);
1009     fdlist = (uint64_t *)(pages + inbufs + outbufs + handles);
1010 
1011     for (i = inbufs; i < ctx->nbufs; ++i) {
1012         if (!ctx->maps[i]) {
1013             void *src = (void *)(uintptr_t)rpra[i].buf.pv;
1014             void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
1015             u64 len = rpra[i].buf.len;
1016 
1017             if (!kernel) {
1018                 if (copy_to_user((void __user *)dst, src, len))
1019                     return -EFAULT;
1020             } else {
1021                 memcpy(dst, src, len);
1022             }
1023         }
1024     }
1025 
1026     for (i = 0; i < FASTRPC_MAX_FDLIST; i++) {
1027         if (!fdlist[i])
1028             break;
1029         if (!fastrpc_map_lookup(fl, (int)fdlist[i], &mmap))
1030             fastrpc_map_put(mmap);
1031     }
1032 
1033     return 0;
1034 }
1035 
1036 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
1037                    struct fastrpc_invoke_ctx *ctx,
1038                    u32 kernel, uint32_t handle)
1039 {
1040     struct fastrpc_channel_ctx *cctx;
1041     struct fastrpc_user *fl = ctx->fl;
1042     struct fastrpc_msg *msg = &ctx->msg;
1043     int ret;
1044 
1045     cctx = fl->cctx;
1046     msg->pid = fl->tgid;
1047     msg->tid = current->pid;
1048 
1049     if (kernel)
1050         msg->pid = 0;
1051 
1052     msg->ctx = ctx->ctxid | fl->pd;
1053     msg->handle = handle;
1054     msg->sc = ctx->sc;
1055     msg->addr = ctx->buf ? ctx->buf->phys : 0;
1056     msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
1057     fastrpc_context_get(ctx);
1058 
1059     ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
1060 
1061     if (ret)
1062         fastrpc_context_put(ctx);
1063 
1064     return ret;
1065 
1066 }
1067 
1068 static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
1069                    u32 handle, u32 sc,
1070                    struct fastrpc_invoke_args *args)
1071 {
1072     struct fastrpc_invoke_ctx *ctx = NULL;
1073     int err = 0;
1074 
1075     if (!fl->sctx)
1076         return -EINVAL;
1077 
1078     if (!fl->cctx->rpdev)
1079         return -EPIPE;
1080 
1081     if (handle == FASTRPC_INIT_HANDLE && !kernel) {
1082         dev_warn_ratelimited(fl->sctx->dev, "user app trying to send a kernel RPC message (%d)\n",  handle);
1083         return -EPERM;
1084     }
1085 
1086     ctx = fastrpc_context_alloc(fl, kernel, sc, args);
1087     if (IS_ERR(ctx))
1088         return PTR_ERR(ctx);
1089 
1090     if (ctx->nscalars) {
1091         err = fastrpc_get_args(kernel, ctx);
1092         if (err)
1093             goto bail;
1094     }
1095 
1096     /* make sure that all CPU memory writes are seen by DSP */
1097     dma_wmb();
1098     /* Send invoke buffer to remote dsp */
1099     err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
1100     if (err)
1101         goto bail;
1102 
1103     if (kernel) {
1104         if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
1105             err = -ETIMEDOUT;
1106     } else {
1107         err = wait_for_completion_interruptible(&ctx->work);
1108     }
1109 
1110     if (err)
1111         goto bail;
1112 
1113     /* Check the response from remote dsp */
1114     err = ctx->retval;
1115     if (err)
1116         goto bail;
1117 
1118     if (ctx->nscalars) {
1119         /* make sure that all memory writes by DSP are seen by CPU */
1120         dma_rmb();
1121         /* populate all the output buffers with results */
1122         err = fastrpc_put_args(ctx, kernel);
1123         if (err)
1124             goto bail;
1125     }
1126 
1127 bail:
1128     if (err != -ERESTARTSYS && err != -ETIMEDOUT) {
1129         /* We are done with this compute context */
1130         spin_lock(&fl->lock);
1131         list_del(&ctx->node);
1132         spin_unlock(&fl->lock);
1133         fastrpc_context_put(ctx);
1134     }
1135     if (err)
1136         dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
1137 
1138     return err;
1139 }
1140 
1141 static bool is_session_rejected(struct fastrpc_user *fl, bool unsigned_pd_request)
1142 {
1143     /* Check if the device node is non-secure and channel is secure*/
1144     if (!fl->is_secure_dev && fl->cctx->secure) {
1145         /*
1146          * Allow untrusted applications to offload only to Unsigned PD when
1147          * channel is configured as secure and block untrusted apps on channel
1148          * that does not support unsigned PD offload
1149          */
1150         if (!fl->cctx->unsigned_support || !unsigned_pd_request) {
1151             dev_err(&fl->cctx->rpdev->dev, "Error: Untrusted application trying to offload to signed PD");
1152             return true;
1153         }
1154     }
1155 
1156     return false;
1157 }
1158 
1159 static int fastrpc_init_create_process(struct fastrpc_user *fl,
1160                     char __user *argp)
1161 {
1162     struct fastrpc_init_create init;
1163     struct fastrpc_invoke_args *args;
1164     struct fastrpc_phy_page pages[1];
1165     struct fastrpc_map *map = NULL;
1166     struct fastrpc_buf *imem = NULL;
1167     int memlen;
1168     int err;
1169     struct {
1170         int pgid;
1171         u32 namelen;
1172         u32 filelen;
1173         u32 pageslen;
1174         u32 attrs;
1175         u32 siglen;
1176     } inbuf;
1177     u32 sc;
1178     bool unsigned_module = false;
1179 
1180     args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
1181     if (!args)
1182         return -ENOMEM;
1183 
1184     if (copy_from_user(&init, argp, sizeof(init))) {
1185         err = -EFAULT;
1186         goto err;
1187     }
1188 
1189     if (init.attrs & FASTRPC_MODE_UNSIGNED_MODULE)
1190         unsigned_module = true;
1191 
1192     if (is_session_rejected(fl, unsigned_module)) {
1193         err = -ECONNREFUSED;
1194         goto err;
1195     }
1196 
1197     if (init.filelen > INIT_FILELEN_MAX) {
1198         err = -EINVAL;
1199         goto err;
1200     }
1201 
1202     inbuf.pgid = fl->tgid;
1203     inbuf.namelen = strlen(current->comm) + 1;
1204     inbuf.filelen = init.filelen;
1205     inbuf.pageslen = 1;
1206     inbuf.attrs = init.attrs;
1207     inbuf.siglen = init.siglen;
1208     fl->pd = USER_PD;
1209 
1210     if (init.filelen && init.filefd) {
1211         err = fastrpc_map_create(fl, init.filefd, init.filelen, 0, &map);
1212         if (err)
1213             goto err;
1214     }
1215 
1216     memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1217                1024 * 1024);
1218     err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1219                 &imem);
1220     if (err)
1221         goto err_alloc;
1222 
1223     fl->init_mem = imem;
1224     args[0].ptr = (u64)(uintptr_t)&inbuf;
1225     args[0].length = sizeof(inbuf);
1226     args[0].fd = -1;
1227 
1228     args[1].ptr = (u64)(uintptr_t)current->comm;
1229     args[1].length = inbuf.namelen;
1230     args[1].fd = -1;
1231 
1232     args[2].ptr = (u64) init.file;
1233     args[2].length = inbuf.filelen;
1234     args[2].fd = init.filefd;
1235 
1236     pages[0].addr = imem->phys;
1237     pages[0].size = imem->size;
1238 
1239     args[3].ptr = (u64)(uintptr_t) pages;
1240     args[3].length = 1 * sizeof(*pages);
1241     args[3].fd = -1;
1242 
1243     args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1244     args[4].length = sizeof(inbuf.attrs);
1245     args[4].fd = -1;
1246 
1247     args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1248     args[5].length = sizeof(inbuf.siglen);
1249     args[5].fd = -1;
1250 
1251     sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1252     if (init.attrs)
1253         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1254 
1255     err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1256                       sc, args);
1257     if (err)
1258         goto err_invoke;
1259 
1260     kfree(args);
1261 
1262     return 0;
1263 
1264 err_invoke:
1265     fl->init_mem = NULL;
1266     fastrpc_buf_free(imem);
1267 err_alloc:
1268     if (map) {
1269         spin_lock(&fl->lock);
1270         list_del(&map->node);
1271         spin_unlock(&fl->lock);
1272         fastrpc_map_put(map);
1273     }
1274 err:
1275     kfree(args);
1276 
1277     return err;
1278 }
1279 
1280 static struct fastrpc_session_ctx *fastrpc_session_alloc(
1281                     struct fastrpc_channel_ctx *cctx)
1282 {
1283     struct fastrpc_session_ctx *session = NULL;
1284     unsigned long flags;
1285     int i;
1286 
1287     spin_lock_irqsave(&cctx->lock, flags);
1288     for (i = 0; i < cctx->sesscount; i++) {
1289         if (!cctx->session[i].used && cctx->session[i].valid) {
1290             cctx->session[i].used = true;
1291             session = &cctx->session[i];
1292             break;
1293         }
1294     }
1295     spin_unlock_irqrestore(&cctx->lock, flags);
1296 
1297     return session;
1298 }
1299 
1300 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1301                  struct fastrpc_session_ctx *session)
1302 {
1303     unsigned long flags;
1304 
1305     spin_lock_irqsave(&cctx->lock, flags);
1306     session->used = false;
1307     spin_unlock_irqrestore(&cctx->lock, flags);
1308 }
1309 
1310 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1311 {
1312     struct fastrpc_invoke_args args[1];
1313     int tgid = 0;
1314     u32 sc;
1315 
1316     tgid = fl->tgid;
1317     args[0].ptr = (u64)(uintptr_t) &tgid;
1318     args[0].length = sizeof(tgid);
1319     args[0].fd = -1;
1320     sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1321 
1322     return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1323                        sc, &args[0]);
1324 }
1325 
1326 static int fastrpc_device_release(struct inode *inode, struct file *file)
1327 {
1328     struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1329     struct fastrpc_channel_ctx *cctx = fl->cctx;
1330     struct fastrpc_invoke_ctx *ctx, *n;
1331     struct fastrpc_map *map, *m;
1332     struct fastrpc_buf *buf, *b;
1333     unsigned long flags;
1334 
1335     fastrpc_release_current_dsp_process(fl);
1336 
1337     spin_lock_irqsave(&cctx->lock, flags);
1338     list_del(&fl->user);
1339     spin_unlock_irqrestore(&cctx->lock, flags);
1340 
1341     if (fl->init_mem)
1342         fastrpc_buf_free(fl->init_mem);
1343 
1344     list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1345         list_del(&ctx->node);
1346         fastrpc_context_put(ctx);
1347     }
1348 
1349     list_for_each_entry_safe(map, m, &fl->maps, node) {
1350         list_del(&map->node);
1351         fastrpc_map_put(map);
1352     }
1353 
1354     list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1355         list_del(&buf->node);
1356         fastrpc_buf_free(buf);
1357     }
1358 
1359     fastrpc_session_free(cctx, fl->sctx);
1360     fastrpc_channel_ctx_put(cctx);
1361 
1362     mutex_destroy(&fl->mutex);
1363     kfree(fl);
1364     file->private_data = NULL;
1365 
1366     return 0;
1367 }
1368 
1369 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1370 {
1371     struct fastrpc_channel_ctx *cctx;
1372     struct fastrpc_device *fdevice;
1373     struct fastrpc_user *fl = NULL;
1374     unsigned long flags;
1375 
1376     fdevice = miscdev_to_fdevice(filp->private_data);
1377     cctx = fdevice->cctx;
1378 
1379     fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1380     if (!fl)
1381         return -ENOMEM;
1382 
1383     /* Released in fastrpc_device_release() */
1384     fastrpc_channel_ctx_get(cctx);
1385 
1386     filp->private_data = fl;
1387     spin_lock_init(&fl->lock);
1388     mutex_init(&fl->mutex);
1389     INIT_LIST_HEAD(&fl->pending);
1390     INIT_LIST_HEAD(&fl->maps);
1391     INIT_LIST_HEAD(&fl->mmaps);
1392     INIT_LIST_HEAD(&fl->user);
1393     fl->tgid = current->tgid;
1394     fl->cctx = cctx;
1395     fl->is_secure_dev = fdevice->secure;
1396 
1397     fl->sctx = fastrpc_session_alloc(cctx);
1398     if (!fl->sctx) {
1399         dev_err(&cctx->rpdev->dev, "No session available\n");
1400         mutex_destroy(&fl->mutex);
1401         kfree(fl);
1402 
1403         return -EBUSY;
1404     }
1405 
1406     spin_lock_irqsave(&cctx->lock, flags);
1407     list_add_tail(&fl->user, &cctx->users);
1408     spin_unlock_irqrestore(&cctx->lock, flags);
1409 
1410     return 0;
1411 }
1412 
1413 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1414 {
1415     struct fastrpc_alloc_dma_buf bp;
1416     DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1417     struct fastrpc_buf *buf = NULL;
1418     int err;
1419 
1420     if (copy_from_user(&bp, argp, sizeof(bp)))
1421         return -EFAULT;
1422 
1423     err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1424     if (err)
1425         return err;
1426     exp_info.ops = &fastrpc_dma_buf_ops;
1427     exp_info.size = bp.size;
1428     exp_info.flags = O_RDWR;
1429     exp_info.priv = buf;
1430     buf->dmabuf = dma_buf_export(&exp_info);
1431     if (IS_ERR(buf->dmabuf)) {
1432         err = PTR_ERR(buf->dmabuf);
1433         fastrpc_buf_free(buf);
1434         return err;
1435     }
1436 
1437     bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1438     if (bp.fd < 0) {
1439         dma_buf_put(buf->dmabuf);
1440         return -EINVAL;
1441     }
1442 
1443     if (copy_to_user(argp, &bp, sizeof(bp))) {
1444         /*
1445          * The usercopy failed, but we can't do much about it, as
1446          * dma_buf_fd() already called fd_install() and made the
1447          * file descriptor accessible for the current process. It
1448          * might already be closed and dmabuf no longer valid when
1449          * we reach this point. Therefore "leak" the fd and rely on
1450          * the process exit path to do any required cleanup.
1451          */
1452         return -EFAULT;
1453     }
1454 
1455     return 0;
1456 }
1457 
1458 static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
1459 {
1460     struct fastrpc_invoke_args args[1];
1461     int tgid = fl->tgid;
1462     u32 sc;
1463 
1464     args[0].ptr = (u64)(uintptr_t) &tgid;
1465     args[0].length = sizeof(tgid);
1466     args[0].fd = -1;
1467     sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1468     fl->pd = pd;
1469 
1470     return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1471                        sc, &args[0]);
1472 }
1473 
1474 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1475 {
1476     struct fastrpc_invoke_args *args = NULL;
1477     struct fastrpc_invoke inv;
1478     u32 nscalars;
1479     int err;
1480 
1481     if (copy_from_user(&inv, argp, sizeof(inv)))
1482         return -EFAULT;
1483 
1484     /* nscalars is truncated here to max supported value */
1485     nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1486     if (nscalars) {
1487         args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1488         if (!args)
1489             return -ENOMEM;
1490 
1491         if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1492                    nscalars * sizeof(*args))) {
1493             kfree(args);
1494             return -EFAULT;
1495         }
1496     }
1497 
1498     err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1499     kfree(args);
1500 
1501     return err;
1502 }
1503 
1504 static int fastrpc_get_info_from_dsp(struct fastrpc_user *fl, uint32_t *dsp_attr_buf,
1505                      uint32_t dsp_attr_buf_len)
1506 {
1507     struct fastrpc_invoke_args args[2] = { 0 };
1508 
1509     /* Capability filled in userspace */
1510     dsp_attr_buf[0] = 0;
1511 
1512     args[0].ptr = (u64)(uintptr_t)&dsp_attr_buf_len;
1513     args[0].length = sizeof(dsp_attr_buf_len);
1514     args[0].fd = -1;
1515     args[1].ptr = (u64)(uintptr_t)&dsp_attr_buf[1];
1516     args[1].length = dsp_attr_buf_len;
1517     args[1].fd = -1;
1518     fl->pd = 1;
1519 
1520     return fastrpc_internal_invoke(fl, true, FASTRPC_DSP_UTILITIES_HANDLE,
1521                        FASTRPC_SCALARS(0, 1, 1), args);
1522 }
1523 
1524 static int fastrpc_get_info_from_kernel(struct fastrpc_ioctl_capability *cap,
1525                     struct fastrpc_user *fl)
1526 {
1527     struct fastrpc_channel_ctx *cctx = fl->cctx;
1528     uint32_t attribute_id = cap->attribute_id;
1529     uint32_t *dsp_attributes;
1530     unsigned long flags;
1531     uint32_t domain = cap->domain;
1532     int err;
1533 
1534     spin_lock_irqsave(&cctx->lock, flags);
1535     /* check if we already have queried dsp for attributes */
1536     if (cctx->valid_attributes) {
1537         spin_unlock_irqrestore(&cctx->lock, flags);
1538         goto done;
1539     }
1540     spin_unlock_irqrestore(&cctx->lock, flags);
1541 
1542     dsp_attributes = kzalloc(FASTRPC_MAX_DSP_ATTRIBUTES_LEN, GFP_KERNEL);
1543     if (!dsp_attributes)
1544         return -ENOMEM;
1545 
1546     err = fastrpc_get_info_from_dsp(fl, dsp_attributes, FASTRPC_MAX_DSP_ATTRIBUTES_LEN);
1547     if (err == DSP_UNSUPPORTED_API) {
1548         dev_info(&cctx->rpdev->dev,
1549              "Warning: DSP capabilities not supported on domain: %d\n", domain);
1550         kfree(dsp_attributes);
1551         return -EOPNOTSUPP;
1552     } else if (err) {
1553         dev_err(&cctx->rpdev->dev, "Error: dsp information is incorrect err: %d\n", err);
1554         kfree(dsp_attributes);
1555         return err;
1556     }
1557 
1558     spin_lock_irqsave(&cctx->lock, flags);
1559     memcpy(cctx->dsp_attributes, dsp_attributes, FASTRPC_MAX_DSP_ATTRIBUTES_LEN);
1560     cctx->valid_attributes = true;
1561     spin_unlock_irqrestore(&cctx->lock, flags);
1562     kfree(dsp_attributes);
1563 done:
1564     cap->capability = cctx->dsp_attributes[attribute_id];
1565     return 0;
1566 }
1567 
1568 static int fastrpc_get_dsp_info(struct fastrpc_user *fl, char __user *argp)
1569 {
1570     struct fastrpc_ioctl_capability cap = {0};
1571     int err = 0;
1572 
1573     if (copy_from_user(&cap, argp, sizeof(cap)))
1574         return  -EFAULT;
1575 
1576     cap.capability = 0;
1577     if (cap.domain >= FASTRPC_DEV_MAX) {
1578         dev_err(&fl->cctx->rpdev->dev, "Error: Invalid domain id:%d, err:%d\n",
1579             cap.domain, err);
1580         return -ECHRNG;
1581     }
1582 
1583     /* Fastrpc Capablities does not support modem domain */
1584     if (cap.domain == MDSP_DOMAIN_ID) {
1585         dev_err(&fl->cctx->rpdev->dev, "Error: modem not supported %d\n", err);
1586         return -ECHRNG;
1587     }
1588 
1589     if (cap.attribute_id >= FASTRPC_MAX_DSP_ATTRIBUTES) {
1590         dev_err(&fl->cctx->rpdev->dev, "Error: invalid attribute: %d, err: %d\n",
1591             cap.attribute_id, err);
1592         return -EOVERFLOW;
1593     }
1594 
1595     err = fastrpc_get_info_from_kernel(&cap, fl);
1596     if (err)
1597         return err;
1598 
1599     if (copy_to_user(argp, &cap.capability, sizeof(cap.capability)))
1600         return -EFAULT;
1601 
1602     return 0;
1603 }
1604 
1605 static int fastrpc_req_munmap_impl(struct fastrpc_user *fl,
1606                    struct fastrpc_req_munmap *req)
1607 {
1608     struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
1609     struct fastrpc_buf *buf = NULL, *iter, *b;
1610     struct fastrpc_munmap_req_msg req_msg;
1611     struct device *dev = fl->sctx->dev;
1612     int err;
1613     u32 sc;
1614 
1615     spin_lock(&fl->lock);
1616     list_for_each_entry_safe(iter, b, &fl->mmaps, node) {
1617         if ((iter->raddr == req->vaddrout) && (iter->size == req->size)) {
1618             buf = iter;
1619             break;
1620         }
1621     }
1622     spin_unlock(&fl->lock);
1623 
1624     if (!buf) {
1625         dev_err(dev, "mmap not in list\n");
1626         return -EINVAL;
1627     }
1628 
1629     req_msg.pgid = fl->tgid;
1630     req_msg.size = buf->size;
1631     req_msg.vaddr = buf->raddr;
1632 
1633     args[0].ptr = (u64) (uintptr_t) &req_msg;
1634     args[0].length = sizeof(req_msg);
1635 
1636     sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0);
1637     err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1638                       &args[0]);
1639     if (!err) {
1640         dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr);
1641         spin_lock(&fl->lock);
1642         list_del(&buf->node);
1643         spin_unlock(&fl->lock);
1644         fastrpc_buf_free(buf);
1645     } else {
1646         dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr);
1647     }
1648 
1649     return err;
1650 }
1651 
1652 static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp)
1653 {
1654     struct fastrpc_req_munmap req;
1655 
1656     if (copy_from_user(&req, argp, sizeof(req)))
1657         return -EFAULT;
1658 
1659     return fastrpc_req_munmap_impl(fl, &req);
1660 }
1661 
1662 static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
1663 {
1664     struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } };
1665     struct fastrpc_buf *buf = NULL;
1666     struct fastrpc_mmap_req_msg req_msg;
1667     struct fastrpc_mmap_rsp_msg rsp_msg;
1668     struct fastrpc_req_munmap req_unmap;
1669     struct fastrpc_phy_page pages;
1670     struct fastrpc_req_mmap req;
1671     struct device *dev = fl->sctx->dev;
1672     int err;
1673     u32 sc;
1674 
1675     if (copy_from_user(&req, argp, sizeof(req)))
1676         return -EFAULT;
1677 
1678     if (req.flags != ADSP_MMAP_ADD_PAGES) {
1679         dev_err(dev, "flag not supported 0x%x\n", req.flags);
1680         return -EINVAL;
1681     }
1682 
1683     if (req.vaddrin) {
1684         dev_err(dev, "adding user allocated pages is not supported\n");
1685         return -EINVAL;
1686     }
1687 
1688     err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
1689     if (err) {
1690         dev_err(dev, "failed to allocate buffer\n");
1691         return err;
1692     }
1693 
1694     req_msg.pgid = fl->tgid;
1695     req_msg.flags = req.flags;
1696     req_msg.vaddr = req.vaddrin;
1697     req_msg.num = sizeof(pages);
1698 
1699     args[0].ptr = (u64) (uintptr_t) &req_msg;
1700     args[0].length = sizeof(req_msg);
1701 
1702     pages.addr = buf->phys;
1703     pages.size = buf->size;
1704 
1705     args[1].ptr = (u64) (uintptr_t) &pages;
1706     args[1].length = sizeof(pages);
1707 
1708     args[2].ptr = (u64) (uintptr_t) &rsp_msg;
1709     args[2].length = sizeof(rsp_msg);
1710 
1711     sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1);
1712     err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1713                       &args[0]);
1714     if (err) {
1715         dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size);
1716         goto err_invoke;
1717     }
1718 
1719     /* update the buffer to be able to deallocate the memory on the DSP */
1720     buf->raddr = (uintptr_t) rsp_msg.vaddr;
1721 
1722     /* let the client know the address to use */
1723     req.vaddrout = rsp_msg.vaddr;
1724 
1725     spin_lock(&fl->lock);
1726     list_add_tail(&buf->node, &fl->mmaps);
1727     spin_unlock(&fl->lock);
1728 
1729     if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
1730         /* unmap the memory and release the buffer */
1731         req_unmap.vaddrout = buf->raddr;
1732         req_unmap.size = buf->size;
1733         fastrpc_req_munmap_impl(fl, &req_unmap);
1734         return -EFAULT;
1735     }
1736 
1737     dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n",
1738         buf->raddr, buf->size);
1739 
1740     return 0;
1741 
1742 err_invoke:
1743     fastrpc_buf_free(buf);
1744 
1745     return err;
1746 }
1747 
1748 static int fastrpc_req_mem_unmap_impl(struct fastrpc_user *fl, struct fastrpc_mem_unmap *req)
1749 {
1750     struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
1751     struct fastrpc_map *map = NULL, *iter, *m;
1752     struct fastrpc_mem_unmap_req_msg req_msg = { 0 };
1753     int err = 0;
1754     u32 sc;
1755     struct device *dev = fl->sctx->dev;
1756 
1757     spin_lock(&fl->lock);
1758     list_for_each_entry_safe(iter, m, &fl->maps, node) {
1759         if ((req->fd < 0 || iter->fd == req->fd) && (iter->raddr == req->vaddr)) {
1760             map = iter;
1761             break;
1762         }
1763     }
1764 
1765     spin_unlock(&fl->lock);
1766 
1767     if (!map) {
1768         dev_err(dev, "map not in list\n");
1769         return -EINVAL;
1770     }
1771 
1772     req_msg.pgid = fl->tgid;
1773     req_msg.len = map->len;
1774     req_msg.vaddrin = map->raddr;
1775     req_msg.fd = map->fd;
1776 
1777     args[0].ptr = (u64) (uintptr_t) &req_msg;
1778     args[0].length = sizeof(req_msg);
1779 
1780     sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_UNMAP, 1, 0);
1781     err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1782                       &args[0]);
1783     fastrpc_map_put(map);
1784     if (err)
1785         dev_err(dev, "unmmap\tpt fd = %d, 0x%09llx error\n",  map->fd, map->raddr);
1786 
1787     return err;
1788 }
1789 
1790 static int fastrpc_req_mem_unmap(struct fastrpc_user *fl, char __user *argp)
1791 {
1792     struct fastrpc_mem_unmap req;
1793 
1794     if (copy_from_user(&req, argp, sizeof(req)))
1795         return -EFAULT;
1796 
1797     return fastrpc_req_mem_unmap_impl(fl, &req);
1798 }
1799 
1800 static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp)
1801 {
1802     struct fastrpc_invoke_args args[4] = { [0 ... 3] = { 0 } };
1803     struct fastrpc_mem_map_req_msg req_msg = { 0 };
1804     struct fastrpc_mmap_rsp_msg rsp_msg = { 0 };
1805     struct fastrpc_mem_unmap req_unmap = { 0 };
1806     struct fastrpc_phy_page pages = { 0 };
1807     struct fastrpc_mem_map req;
1808     struct device *dev = fl->sctx->dev;
1809     struct fastrpc_map *map = NULL;
1810     int err;
1811     u32 sc;
1812 
1813     if (copy_from_user(&req, argp, sizeof(req)))
1814         return -EFAULT;
1815 
1816     /* create SMMU mapping */
1817     err = fastrpc_map_create(fl, req.fd, req.length, 0, &map);
1818     if (err) {
1819         dev_err(dev, "failed to map buffer, fd = %d\n", req.fd);
1820         return err;
1821     }
1822 
1823     req_msg.pgid = fl->tgid;
1824     req_msg.fd = req.fd;
1825     req_msg.offset = req.offset;
1826     req_msg.vaddrin = req.vaddrin;
1827     map->va = (void *) (uintptr_t) req.vaddrin;
1828     req_msg.flags = req.flags;
1829     req_msg.num = sizeof(pages);
1830     req_msg.data_len = 0;
1831 
1832     args[0].ptr = (u64) (uintptr_t) &req_msg;
1833     args[0].length = sizeof(req_msg);
1834 
1835     pages.addr = map->phys;
1836     pages.size = map->size;
1837 
1838     args[1].ptr = (u64) (uintptr_t) &pages;
1839     args[1].length = sizeof(pages);
1840 
1841     args[2].ptr = (u64) (uintptr_t) &pages;
1842     args[2].length = 0;
1843 
1844     args[3].ptr = (u64) (uintptr_t) &rsp_msg;
1845     args[3].length = sizeof(rsp_msg);
1846 
1847     sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_MAP, 3, 1);
1848     err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, &args[0]);
1849     if (err) {
1850         dev_err(dev, "mem mmap error, fd %d, vaddr %llx, size %lld\n",
1851             req.fd, req.vaddrin, map->size);
1852         goto err_invoke;
1853     }
1854 
1855     /* update the buffer to be able to deallocate the memory on the DSP */
1856     map->raddr = rsp_msg.vaddr;
1857 
1858     /* let the client know the address to use */
1859     req.vaddrout = rsp_msg.vaddr;
1860 
1861     if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
1862         /* unmap the memory and release the buffer */
1863         req_unmap.vaddr = (uintptr_t) rsp_msg.vaddr;
1864         req_unmap.length = map->size;
1865         fastrpc_req_mem_unmap_impl(fl, &req_unmap);
1866         return -EFAULT;
1867     }
1868 
1869     return 0;
1870 
1871 err_invoke:
1872     fastrpc_map_put(map);
1873 
1874     return err;
1875 }
1876 
1877 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1878                  unsigned long arg)
1879 {
1880     struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1881     char __user *argp = (char __user *)arg;
1882     int err;
1883 
1884     switch (cmd) {
1885     case FASTRPC_IOCTL_INVOKE:
1886         err = fastrpc_invoke(fl, argp);
1887         break;
1888     case FASTRPC_IOCTL_INIT_ATTACH:
1889         err = fastrpc_init_attach(fl, AUDIO_PD);
1890         break;
1891     case FASTRPC_IOCTL_INIT_ATTACH_SNS:
1892         err = fastrpc_init_attach(fl, SENSORS_PD);
1893         break;
1894     case FASTRPC_IOCTL_INIT_CREATE:
1895         err = fastrpc_init_create_process(fl, argp);
1896         break;
1897     case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1898         err = fastrpc_dmabuf_alloc(fl, argp);
1899         break;
1900     case FASTRPC_IOCTL_MMAP:
1901         err = fastrpc_req_mmap(fl, argp);
1902         break;
1903     case FASTRPC_IOCTL_MUNMAP:
1904         err = fastrpc_req_munmap(fl, argp);
1905         break;
1906     case FASTRPC_IOCTL_MEM_MAP:
1907         err = fastrpc_req_mem_map(fl, argp);
1908         break;
1909     case FASTRPC_IOCTL_MEM_UNMAP:
1910         err = fastrpc_req_mem_unmap(fl, argp);
1911         break;
1912     case FASTRPC_IOCTL_GET_DSP_INFO:
1913         err = fastrpc_get_dsp_info(fl, argp);
1914         break;
1915     default:
1916         err = -ENOTTY;
1917         break;
1918     }
1919 
1920     return err;
1921 }
1922 
1923 static const struct file_operations fastrpc_fops = {
1924     .open = fastrpc_device_open,
1925     .release = fastrpc_device_release,
1926     .unlocked_ioctl = fastrpc_device_ioctl,
1927     .compat_ioctl = fastrpc_device_ioctl,
1928 };
1929 
1930 static int fastrpc_cb_probe(struct platform_device *pdev)
1931 {
1932     struct fastrpc_channel_ctx *cctx;
1933     struct fastrpc_session_ctx *sess;
1934     struct device *dev = &pdev->dev;
1935     int i, sessions = 0;
1936     unsigned long flags;
1937     int rc;
1938 
1939     cctx = dev_get_drvdata(dev->parent);
1940     if (!cctx)
1941         return -EINVAL;
1942 
1943     of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1944 
1945     spin_lock_irqsave(&cctx->lock, flags);
1946     if (cctx->sesscount >= FASTRPC_MAX_SESSIONS) {
1947         dev_err(&pdev->dev, "too many sessions\n");
1948         spin_unlock_irqrestore(&cctx->lock, flags);
1949         return -ENOSPC;
1950     }
1951     sess = &cctx->session[cctx->sesscount++];
1952     sess->used = false;
1953     sess->valid = true;
1954     sess->dev = dev;
1955     dev_set_drvdata(dev, sess);
1956 
1957     if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1958         dev_info(dev, "FastRPC Session ID not specified in DT\n");
1959 
1960     if (sessions > 0) {
1961         struct fastrpc_session_ctx *dup_sess;
1962 
1963         for (i = 1; i < sessions; i++) {
1964             if (cctx->sesscount >= FASTRPC_MAX_SESSIONS)
1965                 break;
1966             dup_sess = &cctx->session[cctx->sesscount++];
1967             memcpy(dup_sess, sess, sizeof(*dup_sess));
1968         }
1969     }
1970     spin_unlock_irqrestore(&cctx->lock, flags);
1971     rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1972     if (rc) {
1973         dev_err(dev, "32-bit DMA enable failed\n");
1974         return rc;
1975     }
1976 
1977     return 0;
1978 }
1979 
1980 static int fastrpc_cb_remove(struct platform_device *pdev)
1981 {
1982     struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1983     struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1984     unsigned long flags;
1985     int i;
1986 
1987     spin_lock_irqsave(&cctx->lock, flags);
1988     for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1989         if (cctx->session[i].sid == sess->sid) {
1990             cctx->session[i].valid = false;
1991             cctx->sesscount--;
1992         }
1993     }
1994     spin_unlock_irqrestore(&cctx->lock, flags);
1995 
1996     return 0;
1997 }
1998 
1999 static const struct of_device_id fastrpc_match_table[] = {
2000     { .compatible = "qcom,fastrpc-compute-cb", },
2001     {}
2002 };
2003 
2004 static struct platform_driver fastrpc_cb_driver = {
2005     .probe = fastrpc_cb_probe,
2006     .remove = fastrpc_cb_remove,
2007     .driver = {
2008         .name = "qcom,fastrpc-cb",
2009         .of_match_table = fastrpc_match_table,
2010         .suppress_bind_attrs = true,
2011     },
2012 };
2013 
2014 static int fastrpc_device_register(struct device *dev, struct fastrpc_channel_ctx *cctx,
2015                    bool is_secured, const char *domain)
2016 {
2017     struct fastrpc_device *fdev;
2018     int err;
2019 
2020     fdev = devm_kzalloc(dev, sizeof(*fdev), GFP_KERNEL);
2021     if (!fdev)
2022         return -ENOMEM;
2023 
2024     fdev->secure = is_secured;
2025     fdev->cctx = cctx;
2026     fdev->miscdev.minor = MISC_DYNAMIC_MINOR;
2027     fdev->miscdev.fops = &fastrpc_fops;
2028     fdev->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "fastrpc-%s%s",
2029                         domain, is_secured ? "-secure" : "");
2030     err = misc_register(&fdev->miscdev);
2031     if (!err) {
2032         if (is_secured)
2033             cctx->secure_fdevice = fdev;
2034         else
2035             cctx->fdevice = fdev;
2036     }
2037 
2038     return err;
2039 }
2040 
2041 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
2042 {
2043     struct device *rdev = &rpdev->dev;
2044     struct fastrpc_channel_ctx *data;
2045     int i, err, domain_id = -1, vmcount;
2046     const char *domain;
2047     bool secure_dsp;
2048     unsigned int vmids[FASTRPC_MAX_VMIDS];
2049 
2050     err = of_property_read_string(rdev->of_node, "label", &domain);
2051     if (err) {
2052         dev_info(rdev, "FastRPC Domain not specified in DT\n");
2053         return err;
2054     }
2055 
2056     for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
2057         if (!strcmp(domains[i], domain)) {
2058             domain_id = i;
2059             break;
2060         }
2061     }
2062 
2063     if (domain_id < 0) {
2064         dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
2065         return -EINVAL;
2066     }
2067 
2068     vmcount = of_property_read_variable_u32_array(rdev->of_node,
2069                 "qcom,vmids", &vmids[0], 0, FASTRPC_MAX_VMIDS);
2070     if (vmcount < 0)
2071         vmcount = 0;
2072     else if (!qcom_scm_is_available())
2073         return -EPROBE_DEFER;
2074 
2075     data = kzalloc(sizeof(*data), GFP_KERNEL);
2076     if (!data)
2077         return -ENOMEM;
2078 
2079     if (vmcount) {
2080         data->vmcount = vmcount;
2081         data->perms = BIT(QCOM_SCM_VMID_HLOS);
2082         for (i = 0; i < data->vmcount; i++) {
2083             data->vmperms[i].vmid = vmids[i];
2084             data->vmperms[i].perm = QCOM_SCM_PERM_RWX;
2085         }
2086     }
2087 
2088     secure_dsp = !(of_property_read_bool(rdev->of_node, "qcom,non-secure-domain"));
2089     data->secure = secure_dsp;
2090 
2091     switch (domain_id) {
2092     case ADSP_DOMAIN_ID:
2093     case MDSP_DOMAIN_ID:
2094     case SDSP_DOMAIN_ID:
2095         /* Unsigned PD offloading is only supported on CDSP*/
2096         data->unsigned_support = false;
2097         err = fastrpc_device_register(rdev, data, secure_dsp, domains[domain_id]);
2098         if (err)
2099             goto fdev_error;
2100         break;
2101     case CDSP_DOMAIN_ID:
2102         data->unsigned_support = true;
2103         /* Create both device nodes so that we can allow both Signed and Unsigned PD */
2104         err = fastrpc_device_register(rdev, data, true, domains[domain_id]);
2105         if (err)
2106             goto fdev_error;
2107 
2108         err = fastrpc_device_register(rdev, data, false, domains[domain_id]);
2109         if (err)
2110             goto fdev_error;
2111         break;
2112     default:
2113         err = -EINVAL;
2114         goto fdev_error;
2115     }
2116 
2117     kref_init(&data->refcount);
2118 
2119     dev_set_drvdata(&rpdev->dev, data);
2120     dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
2121     INIT_LIST_HEAD(&data->users);
2122     spin_lock_init(&data->lock);
2123     idr_init(&data->ctx_idr);
2124     data->domain_id = domain_id;
2125     data->rpdev = rpdev;
2126 
2127     return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
2128 fdev_error:
2129     kfree(data);
2130     return err;
2131 }
2132 
2133 static void fastrpc_notify_users(struct fastrpc_user *user)
2134 {
2135     struct fastrpc_invoke_ctx *ctx;
2136 
2137     spin_lock(&user->lock);
2138     list_for_each_entry(ctx, &user->pending, node)
2139         complete(&ctx->work);
2140     spin_unlock(&user->lock);
2141 }
2142 
2143 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
2144 {
2145     struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
2146     struct fastrpc_user *user;
2147     unsigned long flags;
2148 
2149     spin_lock_irqsave(&cctx->lock, flags);
2150     list_for_each_entry(user, &cctx->users, user)
2151         fastrpc_notify_users(user);
2152     spin_unlock_irqrestore(&cctx->lock, flags);
2153 
2154     if (cctx->fdevice)
2155         misc_deregister(&cctx->fdevice->miscdev);
2156 
2157     if (cctx->secure_fdevice)
2158         misc_deregister(&cctx->secure_fdevice->miscdev);
2159 
2160     of_platform_depopulate(&rpdev->dev);
2161 
2162     cctx->rpdev = NULL;
2163     fastrpc_channel_ctx_put(cctx);
2164 }
2165 
2166 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
2167                   int len, void *priv, u32 addr)
2168 {
2169     struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
2170     struct fastrpc_invoke_rsp *rsp = data;
2171     struct fastrpc_invoke_ctx *ctx;
2172     unsigned long flags;
2173     unsigned long ctxid;
2174 
2175     if (len < sizeof(*rsp))
2176         return -EINVAL;
2177 
2178     ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
2179 
2180     spin_lock_irqsave(&cctx->lock, flags);
2181     ctx = idr_find(&cctx->ctx_idr, ctxid);
2182     spin_unlock_irqrestore(&cctx->lock, flags);
2183 
2184     if (!ctx) {
2185         dev_err(&rpdev->dev, "No context ID matches response\n");
2186         return -ENOENT;
2187     }
2188 
2189     ctx->retval = rsp->retval;
2190     complete(&ctx->work);
2191 
2192     /*
2193      * The DMA buffer associated with the context cannot be freed in
2194      * interrupt context so schedule it through a worker thread to
2195      * avoid a kernel BUG.
2196      */
2197     schedule_work(&ctx->put_work);
2198 
2199     return 0;
2200 }
2201 
2202 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
2203     { .compatible = "qcom,fastrpc" },
2204     { },
2205 };
2206 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
2207 
2208 static struct rpmsg_driver fastrpc_driver = {
2209     .probe = fastrpc_rpmsg_probe,
2210     .remove = fastrpc_rpmsg_remove,
2211     .callback = fastrpc_rpmsg_callback,
2212     .drv = {
2213         .name = "qcom,fastrpc",
2214         .of_match_table = fastrpc_rpmsg_of_match,
2215     },
2216 };
2217 
2218 static int fastrpc_init(void)
2219 {
2220     int ret;
2221 
2222     ret = platform_driver_register(&fastrpc_cb_driver);
2223     if (ret < 0) {
2224         pr_err("fastrpc: failed to register cb driver\n");
2225         return ret;
2226     }
2227 
2228     ret = register_rpmsg_driver(&fastrpc_driver);
2229     if (ret < 0) {
2230         pr_err("fastrpc: failed to register rpmsg driver\n");
2231         platform_driver_unregister(&fastrpc_cb_driver);
2232         return ret;
2233     }
2234 
2235     return 0;
2236 }
2237 module_init(fastrpc_init);
2238 
2239 static void fastrpc_exit(void)
2240 {
2241     platform_driver_unregister(&fastrpc_cb_driver);
2242     unregister_rpmsg_driver(&fastrpc_driver);
2243 }
2244 module_exit(fastrpc_exit);
2245 
2246 MODULE_LICENSE("GPL v2");
2247 MODULE_IMPORT_NS(DMA_BUF);
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