tee_shm_register() is replaced by the previously introduced functions tee_shm_register_user_buf() and tee_shm_register_kernel_buf().
Since there are not external callers left we can remove tee_shm_register() and refactor the remains.
Reviewed-by: Sumit Garg sumit.garg@linaro.org Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/tee_shm.c | 156 +++++++++++++++++++++++----------------- include/linux/tee_drv.h | 11 --- 2 files changed, 90 insertions(+), 77 deletions(-)
diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 359bab36e163..9db571253802 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -12,17 +12,43 @@ #include <linux/uio.h> #include "tee_private.h"
+static void shm_put_kernel_pages(struct page **pages, size_t page_count) +{ + size_t n; + + for (n = 0; n < page_count; n++) + put_page(pages[n]); +} + +static int shm_get_kernel_pages(unsigned long start, size_t page_count, + struct page **pages) +{ + struct kvec *kiov; + size_t n; + int rc; + + kiov = kcalloc(page_count, sizeof(*kiov), GFP_KERNEL); + if (!kiov) + return -ENOMEM; + + for (n = 0; n < page_count; n++) { + kiov[n].iov_base = (void *)(start + n * PAGE_SIZE); + kiov[n].iov_len = PAGE_SIZE; + } + + rc = get_kernel_pages(kiov, page_count, 0, pages); + kfree(kiov); + + return rc; +} + static void release_registered_pages(struct tee_shm *shm) { if (shm->pages) { - if (shm->flags & TEE_SHM_USER_MAPPED) { + if (shm->flags & TEE_SHM_USER_MAPPED) unpin_user_pages(shm->pages, shm->num_pages); - } else { - size_t n; - - for (n = 0; n < shm->num_pages; n++) - put_page(shm->pages[n]); - } + else + shm_put_kernel_pages(shm->pages, shm->num_pages);
kfree(shm->pages); } @@ -189,28 +215,24 @@ struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size) } EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf);
-struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, - size_t length, u32 flags) +static struct tee_shm * +register_shm_helper(struct tee_context *ctx, unsigned long addr, + size_t length, u32 flags, int id) { struct tee_device *teedev = ctx->teedev; - const u32 req_user_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED; - const u32 req_kernel_flags = TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED; struct tee_shm *shm; + unsigned long start; + size_t num_pages; void *ret; int rc; - int num_pages; - unsigned long start; - - if (flags != req_user_flags && flags != req_kernel_flags) - return ERR_PTR(-ENOTSUPP);
if (!tee_device_get(teedev)) return ERR_PTR(-EINVAL);
if (!teedev->desc->ops->shm_register || !teedev->desc->ops->shm_unregister) { - tee_device_put(teedev); - return ERR_PTR(-ENOTSUPP); + ret = ERR_PTR(-ENOTSUPP); + goto err_dev_put; }
teedev_ctx_get(ctx); @@ -218,13 +240,13 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, shm = kzalloc(sizeof(*shm), GFP_KERNEL); if (!shm) { ret = ERR_PTR(-ENOMEM); - goto err; + goto err_ctx_put; }
refcount_set(&shm->refcount, 1); - shm->flags = flags | TEE_SHM_REGISTER; + shm->flags = flags; shm->ctx = ctx; - shm->id = -1; + shm->id = id; addr = untagged_addr(addr); start = rounddown(addr, PAGE_SIZE); shm->offset = addr - start; @@ -233,71 +255,45 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL); if (!shm->pages) { ret = ERR_PTR(-ENOMEM); - goto err; + goto err_free_shm; }
- if (flags & TEE_SHM_USER_MAPPED) { + if (flags & TEE_SHM_USER_MAPPED) rc = pin_user_pages_fast(start, num_pages, FOLL_WRITE, shm->pages); - } else { - struct kvec *kiov; - int i; - - kiov = kcalloc(num_pages, sizeof(*kiov), GFP_KERNEL); - if (!kiov) { - ret = ERR_PTR(-ENOMEM); - goto err; - } - - for (i = 0; i < num_pages; i++) { - kiov[i].iov_base = (void *)(start + i * PAGE_SIZE); - kiov[i].iov_len = PAGE_SIZE; - } - - rc = get_kernel_pages(kiov, num_pages, 0, shm->pages); - kfree(kiov); - } + else + rc = shm_get_kernel_pages(start, num_pages, shm->pages); if (rc > 0) shm->num_pages = rc; if (rc != num_pages) { if (rc >= 0) rc = -ENOMEM; ret = ERR_PTR(rc); - goto err; - } - - 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; + goto err_put_shm_pages; }
rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages, shm->num_pages, start); if (rc) { ret = ERR_PTR(rc); - goto err; + goto err_put_shm_pages; }
return shm; -err: - if (shm) { - if (shm->id >= 0) { - mutex_lock(&teedev->mutex); - idr_remove(&teedev->idr, shm->id); - mutex_unlock(&teedev->mutex); - } - release_registered_pages(shm); - } +err_put_shm_pages: + if (flags & TEE_SHM_USER_MAPPED) + unpin_user_pages(shm->pages, shm->num_pages); + else + shm_put_kernel_pages(shm->pages, shm->num_pages); + kfree(shm->pages); +err_free_shm: kfree(shm); +err_ctx_put: teedev_ctx_put(ctx); +err_dev_put: tee_device_put(teedev); return ret; } -EXPORT_SYMBOL_GPL(tee_shm_register);
/** * tee_shm_register_user_buf() - Register a userspace shared memory buffer @@ -310,8 +306,35 @@ EXPORT_SYMBOL_GPL(tee_shm_register); struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx, unsigned long addr, size_t length) { - return tee_shm_register(ctx, addr, length, - TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED); + u32 flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED | TEE_SHM_REGISTER; + struct tee_device *teedev = ctx->teedev; + struct tee_shm *shm; + void *ret; + int id; + + mutex_lock(&teedev->mutex); + id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL); + mutex_unlock(&teedev->mutex); + if (id < 0) + return ERR_PTR(id); + + shm = register_shm_helper(ctx, addr, length, flags, id); + if (IS_ERR(shm)) { + mutex_lock(&teedev->mutex); + idr_remove(&teedev->idr, id); + mutex_unlock(&teedev->mutex); + return shm; + } + + mutex_lock(&teedev->mutex); + ret = idr_replace(&teedev->idr, shm, id); + mutex_unlock(&teedev->mutex); + if (IS_ERR(ret)) { + tee_shm_free(shm); + return ret; + } + + return shm; }
/** @@ -327,8 +350,9 @@ struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx, struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx, void *addr, size_t length) { - return tee_shm_register(ctx, (unsigned long)addr, length, - TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED); + u32 flags = TEE_SHM_REGISTER | TEE_SHM_KERNEL_MAPPED; + + return register_shm_helper(ctx, (unsigned long)addr, length, flags, -1); } EXPORT_SYMBOL_GPL(tee_shm_register_kernel_buf);
diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index c9d2cc32a5ed..a3b663ef0694 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -276,17 +276,6 @@ void *tee_get_drvdata(struct tee_device *teedev); struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size); struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, 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 - * @length: Length of the shared buffer - * @flags: Flags setting properties for the requested shared memory. - * - * @returns a pointer to 'struct tee_shm' - */ -struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, - size_t length, u32 flags); struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx, void *addr, size_t length);