diff options
author | Arnd Bergmann <arnd@arndb.de> | 2020-03-26 16:30:44 +0300 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2020-03-27 16:26:14 +0300 |
commit | 021249ec6f9623dc79e3874f6a68eba7fe91a3d3 (patch) | |
tree | f6c69e77f74f628f32c805b062c37a8517b79eca | |
parent | 3a3052f1fcd0d9755ff2a862c4c11551123647c1 (diff) | |
parent | 758ecf13a41a9dc4f019c1381566132ef46c08ee (diff) | |
download | linux-021249ec6f9623dc79e3874f6a68eba7fe91a3d3.tar.xz |
Merge tag 'tee-cleanup-for-5.7' of https://git.linaro.org/people/jens.wiklander/linux-tee into arm/drivers
Cleanup shared memory handing in TEE subsystem
The highlights are:
- Removing redundant or unused fields in struct tee_shm
- Only assign userspace shm IDs for shared memory objects originating from
user space
* tag 'tee-cleanup-for-5.7' of https://git.linaro.org/people/jens.wiklander/linux-tee:
tee: tee_shm_op_mmap(): use TEE_SHM_USER_MAPPED
tee: remove redundant teedev in struct tee_shm
tee: don't assign shm id for private shms
tee: remove unused tee_shm_priv_alloc()
tee: remove linked list of struct tee_shm
Link: https://lore.kernel.org/r/20200228140925.GA12393@jade
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
-rw-r--r-- | drivers/tee/tee_core.c | 1 | ||||
-rw-r--r-- | drivers/tee/tee_private.h | 3 | ||||
-rw-r--r-- | drivers/tee/tee_shm.c | 85 | ||||
-rw-r--r-- | include/linux/tee_drv.h | 19 |
4 files changed, 27 insertions, 81 deletions
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 37d22e39fd8d..6aec502c495c 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -44,7 +44,6 @@ static struct tee_context *teedev_open(struct tee_device *teedev) kref_init(&ctx->refcount); ctx->teedev = teedev; - INIT_LIST_HEAD(&ctx->list_shm); rc = teedev->desc->ops->open(ctx); if (rc) goto err; diff --git a/drivers/tee/tee_private.h b/drivers/tee/tee_private.h index f797171f0434..e55204df31ce 100644 --- a/drivers/tee/tee_private.h +++ b/drivers/tee/tee_private.h @@ -37,7 +37,8 @@ struct tee_shm_pool { * @num_users: number of active users of this device * @c_no_user: completion used when unregistering the device * @mutex: mutex protecting @num_users and @idr - * @idr: register of shared memory object allocated on this device + * @idr: register of user space shared memory objects allocated or + * registered on this device * @pool: shared memory pool */ struct tee_device { diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 937ac5aaa6d8..bd679b72bd05 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -13,13 +13,13 @@ static void tee_shm_release(struct tee_shm *shm) { - struct tee_device *teedev = shm->teedev; + struct tee_device *teedev = shm->ctx->teedev; - mutex_lock(&teedev->mutex); - idr_remove(&teedev->idr, shm->id); - if (shm->ctx) - list_del(&shm->link); - mutex_unlock(&teedev->mutex); + if (shm->flags & TEE_SHM_DMA_BUF) { + mutex_lock(&teedev->mutex); + idr_remove(&teedev->idr, shm->id); + mutex_unlock(&teedev->mutex); + } if (shm->flags & TEE_SHM_POOL) { struct tee_shm_pool_mgr *poolm; @@ -44,8 +44,7 @@ static void tee_shm_release(struct tee_shm *shm) kfree(shm->pages); } - if (shm->ctx) - teedev_ctx_put(shm->ctx); + teedev_ctx_put(shm->ctx); kfree(shm); @@ -77,7 +76,7 @@ static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) size_t size = vma->vm_end - vma->vm_start; /* Refuse sharing shared memory provided by application */ - if (shm->flags & TEE_SHM_REGISTER) + if (shm->flags & TEE_SHM_USER_MAPPED) return -EINVAL; return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT, @@ -91,20 +90,14 @@ static const struct dma_buf_ops tee_shm_dma_buf_ops = { .mmap = tee_shm_op_mmap, }; -static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx, - struct tee_device *teedev, - size_t size, u32 flags) +struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags) { + struct tee_device *teedev = ctx->teedev; struct tee_shm_pool_mgr *poolm = NULL; struct tee_shm *shm; void *ret; int rc; - if (ctx && ctx->teedev != teedev) { - dev_err(teedev->dev.parent, "ctx and teedev mismatch\n"); - return ERR_PTR(-EINVAL); - } - if (!(flags & TEE_SHM_MAPPED)) { dev_err(teedev->dev.parent, "only mapped allocations supported\n"); @@ -132,7 +125,6 @@ static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx, } shm->flags = flags | TEE_SHM_POOL; - shm->teedev = teedev; shm->ctx = ctx; if (flags & TEE_SHM_DMA_BUF) poolm = teedev->pool->dma_buf_mgr; @@ -145,17 +137,18 @@ static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx, goto err_kfree; } - mutex_lock(&teedev->mutex); - shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); - mutex_unlock(&teedev->mutex); - if (shm->id < 0) { - ret = ERR_PTR(shm->id); - goto err_pool_free; - } if (flags & TEE_SHM_DMA_BUF) { DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + mutex_lock(&teedev->mutex); + shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); + mutex_unlock(&teedev->mutex); + if (shm->id < 0) { + ret = ERR_PTR(shm->id); + goto err_pool_free; + } + exp_info.ops = &tee_shm_dma_buf_ops; exp_info.size = shm->size; exp_info.flags = O_RDWR; @@ -168,18 +161,16 @@ static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx, } } - if (ctx) { + if (ctx) teedev_ctx_get(ctx); - mutex_lock(&teedev->mutex); - list_add_tail(&shm->link, &ctx->list_shm); - mutex_unlock(&teedev->mutex); - } return shm; err_rem: - mutex_lock(&teedev->mutex); - idr_remove(&teedev->idr, shm->id); - mutex_unlock(&teedev->mutex); + if (flags & TEE_SHM_DMA_BUF) { + mutex_lock(&teedev->mutex); + idr_remove(&teedev->idr, shm->id); + mutex_unlock(&teedev->mutex); + } err_pool_free: poolm->ops->free(poolm, shm); err_kfree: @@ -188,31 +179,8 @@ err_dev_put: tee_device_put(teedev); return ret; } - -/** - * tee_shm_alloc() - Allocate shared memory - * @ctx: Context that allocates the shared memory - * @size: Requested size of shared memory - * @flags: Flags setting properties for the requested shared memory. - * - * Memory allocated as global shared memory is automatically freed when the - * TEE file pointer is closed. The @flags field uses the bits defined by - * TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be - * set. If TEE_SHM_DMA_BUF global shared memory will be allocated and - * associated with a dma-buf handle, else driver private memory. - */ -struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags) -{ - return __tee_shm_alloc(ctx, ctx->teedev, size, flags); -} EXPORT_SYMBOL_GPL(tee_shm_alloc); -struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size) -{ - return __tee_shm_alloc(NULL, teedev, size, TEE_SHM_MAPPED); -} -EXPORT_SYMBOL_GPL(tee_shm_priv_alloc); - struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, size_t length, u32 flags) { @@ -245,7 +213,6 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, } shm->flags = flags | TEE_SHM_REGISTER; - shm->teedev = teedev; shm->ctx = ctx; shm->id = -1; addr = untagged_addr(addr); @@ -301,10 +268,6 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, } } - mutex_lock(&teedev->mutex); - list_add_tail(&shm->link, &ctx->list_shm); - mutex_unlock(&teedev->mutex); - return shm; err: if (shm) { diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 7a03f68fb982..1412e9cc79ce 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -49,7 +49,6 @@ struct tee_shm_pool; */ struct tee_context { struct tee_device *teedev; - struct list_head list_shm; void *data; struct kref refcount; bool releasing; @@ -168,9 +167,7 @@ void tee_device_unregister(struct tee_device *teedev); /** * struct tee_shm - shared memory object - * @teedev: device used to allocate the object - * @ctx: context using the object, if NULL the context is gone - * @link link element + * @ctx: context using the object * @paddr: physical address of the shared memory * @kaddr: virtual address of the shared memory * @size: size of shared memory @@ -185,9 +182,7 @@ void tee_device_unregister(struct tee_device *teedev); * subsystem and from drivers that implements their own shm pool manager. */ struct tee_shm { - struct tee_device *teedev; struct tee_context *ctx; - struct list_head link; phys_addr_t paddr; void *kaddr; size_t size; @@ -319,18 +314,6 @@ void *tee_get_drvdata(struct tee_device *teedev); struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags); /** - * tee_shm_priv_alloc() - Allocate shared memory privately - * @dev: Device that allocates the shared memory - * @size: Requested size of shared memory - * - * Allocates shared memory buffer that is not associated with any client - * context. Such buffers are owned by TEE driver and used for internal calls. - * - * @returns a pointer to 'struct tee_shm' - */ -struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size); - -/** * tee_shm_register() - Register shared memory buffer * @ctx: Context that registers the shared memory * @addr: Address is userspace of the shared buffer |