diff options
| author | Srinivas Kandagatla <srinivas.kandagatla@linaro.org> | 2022-02-14 16:09:51 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-18 14:11:00 +0100 |
| commit | 965602eabb57d086466ad749e81941e3dd66b595 (patch) | |
| tree | 2f6654258a4173334172b947c6d95ea0dc706481 /drivers/misc/fastrpc.c | |
| parent | 084973e944bec21804f8afb0515b25434438699a (diff) | |
| download | linux-965602eabb57d086466ad749e81941e3dd66b595.tar.gz | |
misc: fastrpc: separate fastrpc device from channel context
Currently fastrpc misc device instance is within channel context struct
with a kref. So we have 2 structs with refcount, both of them managing the
same channel context structure.
Separate fastrpc device from channel context and by adding a dedicated
fastrpc_device structure, this should clean the structures a bit and also help
when adding secure device node support.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220214161002.6831-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/fastrpc.c')
| -rw-r--r-- | drivers/misc/fastrpc.c | 46 |
1 files changed, 37 insertions, 9 deletions
diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index aa1682b94a23..ee5eb87e9f87 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -78,7 +78,7 @@ #define USER_PD (1) #define SENSORS_PD (2) -#define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev) +#define miscdev_to_fdevice(d) container_of(d, struct fastrpc_device, miscdev) static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp", "sdsp", "cdsp"}; @@ -212,8 +212,13 @@ struct fastrpc_channel_ctx { spinlock_t lock; struct idr ctx_idr; struct list_head users; - struct miscdevice miscdev; struct kref refcount; + struct fastrpc_device *fdevice; +}; + +struct fastrpc_device { + struct fastrpc_channel_ctx *cctx; + struct miscdevice miscdev; }; struct fastrpc_user { @@ -1220,10 +1225,14 @@ static int fastrpc_device_release(struct inode *inode, struct file *file) static int fastrpc_device_open(struct inode *inode, struct file *filp) { - struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data); + struct fastrpc_channel_ctx *cctx; + struct fastrpc_device *fdevice; struct fastrpc_user *fl = NULL; unsigned long flags; + fdevice = miscdev_to_fdevice(filp->private_data); + cctx = fdevice->cctx; + fl = kzalloc(sizeof(*fl), GFP_KERNEL); if (!fl) return -ENOMEM; @@ -1615,6 +1624,27 @@ static struct platform_driver fastrpc_cb_driver = { }, }; +static int fastrpc_device_register(struct device *dev, struct fastrpc_channel_ctx *cctx, + const char *domain) +{ + struct fastrpc_device *fdev; + int err; + + fdev = devm_kzalloc(dev, sizeof(*fdev), GFP_KERNEL); + if (!fdev) + return -ENOMEM; + + fdev->cctx = cctx; + fdev->miscdev.minor = MISC_DYNAMIC_MINOR; + fdev->miscdev.fops = &fastrpc_fops; + fdev->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "fastrpc-%s", domain); + err = misc_register(&fdev->miscdev); + if (!err) + cctx->fdevice = fdev; + + return err; +} + static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) { struct device *rdev = &rpdev->dev; @@ -1644,11 +1674,7 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) 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); + err = fastrpc_device_register(rdev, data, domains[domain_id]); if (err) { kfree(data); return err; @@ -1688,7 +1714,9 @@ static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) fastrpc_notify_users(user); spin_unlock_irqrestore(&cctx->lock, flags); - misc_deregister(&cctx->miscdev); + if (cctx->fdevice) + misc_deregister(&cctx->fdevice->miscdev); + of_platform_depopulate(&rpdev->dev); cctx->rpdev = NULL; |