Add restricted memory allocation to the TEE subsystem.

Restricted memory refers to memory buffers behind a hardware enforced firewall. It is not accessible to the kernel during normal circumstances but rather only accessible to certain hardware IPs or CPUs executing in higher privileged mode than the kernel itself. This interface allows to allocate and manage such restricted memory buffers via interaction with a TEE implementation.

A new ioctl TEE_IOC_RSTMEM_ALLOC is added to allocate these restricted memory buffers.

The restricted memory is allocated for a specific use-case, like Secure Video Playback, Trusted UI, or Secure Video Recording where certain hardware devices can access the memory.

More use-cases can be added in userspace ABI, but it's up to the backend drivers to provide the implementation.

Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/Makefile | 1 + drivers/tee/tee_core.c | 38 ++++++- drivers/tee/tee_private.h | 2 + drivers/tee/tee_rstmem.c | 201 +++++++++++++++++++++++++++++++++++++ drivers/tee/tee_shm.c | 2 + drivers/tee/tee_shm_pool.c | 69 ++++++++++++- include/linux/tee_core.h | 15 +++ include/linux/tee_drv.h | 2 + include/uapi/linux/tee.h | 44 +++++++- 9 files changed, 370 insertions(+), 4 deletions(-) create mode 100644 drivers/tee/tee_rstmem.c

diff --git a/drivers/tee/Makefile b/drivers/tee/Makefile index 5488cba30bd2..a4c6b55444b9 100644 --- a/drivers/tee/Makefile +++ b/drivers/tee/Makefile @@ -3,6 +3,7 @@ obj-$(CONFIG_TEE) += tee.o tee-objs += tee_core.o tee-objs += tee_shm.o tee-objs += tee_shm_pool.o +tee-objs += tee_rstmem.o obj-$(CONFIG_OPTEE) += optee/ obj-$(CONFIG_AMDTEE) += amdtee/ obj-$(CONFIG_ARM_TSTEE) += tstee/ diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index d113679b1e2d..f4a45b77753b 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -1,12 +1,13 @@ // SPDX-License-Identifier: GPL-2.0-only /* - * Copyright (c) 2015-2016, Linaro Limited + * Copyright (c) 2015-2022, 2024, Linaro Limited */

#define pr_fmt(fmt) "%s: " fmt, __func__

#include <linux/cdev.h> #include <linux/cred.h> +#include <linux/dma-buf.h> #include <linux/fs.h> #include <linux/idr.h> #include <linux/module.h> @@ -815,6 +816,38 @@ static int tee_ioctl_supp_send(struct tee_context *ctx, return rc; }

+static int +tee_ioctl_rstmem_alloc(struct tee_context *ctx, + struct tee_ioctl_rstmem_alloc_data __user *udata) +{ + struct tee_ioctl_rstmem_alloc_data data; + struct dma_buf *dmabuf; + int id; + int fd; + + if (copy_from_user(&data, udata, sizeof(data))) + return -EFAULT; + + if (data.use_case == TEE_IOC_UC_RESERVED) + return -EINVAL; + + dmabuf = tee_rstmem_alloc(ctx, data.flags, data.use_case, data.size, + &id); + if (IS_ERR(dmabuf)) + return PTR_ERR(dmabuf); + if (put_user(id, &udata->id)) { + fd = -EFAULT; + goto err; + } + fd = dma_buf_fd(dmabuf, O_CLOEXEC); + if (fd < 0) + goto err; + return fd; +err: + dma_buf_put(dmabuf); + return fd; +} + static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct tee_context *ctx = filp->private_data; @@ -839,6 +872,8 @@ static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) return tee_ioctl_supp_recv(ctx, uarg); case TEE_IOC_SUPPL_SEND: return tee_ioctl_supp_send(ctx, uarg); + case TEE_IOC_RSTMEM_ALLOC: + return tee_ioctl_rstmem_alloc(ctx, uarg); default: return -EINVAL; } @@ -1286,3 +1321,4 @@ MODULE_AUTHOR("Linaro"); MODULE_DESCRIPTION("TEE Driver"); MODULE_VERSION("1.0"); MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS("DMA_BUF"); diff --git a/drivers/tee/tee_private.h b/drivers/tee/tee_private.h index 9bc50605227c..bf97796909c0 100644 --- a/drivers/tee/tee_private.h +++ b/drivers/tee/tee_private.h @@ -23,5 +23,7 @@ void teedev_ctx_put(struct tee_context *ctx); struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size); struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx, unsigned long addr, size_t length); +struct dma_buf *tee_rstmem_alloc(struct tee_context *ctx, u32 flags, + u32 use_case, size_t size, int *shm_id);

#endif /*TEE_PRIVATE_H*/ diff --git a/drivers/tee/tee_rstmem.c b/drivers/tee/tee_rstmem.c new file mode 100644 index 000000000000..536bca2901e2 --- /dev/null +++ b/drivers/tee/tee_rstmem.c @@ -0,0 +1,201 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2024 Linaro Limited + */ +#include <linux/device.h> +#include <linux/dma-buf.h> +#include <linux/genalloc.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/tee_core.h> +#include "tee_private.h" + +struct tee_rstmem_attachment { + struct sg_table table; + struct device *dev; +}; + +static int rstmem_dma_attach(struct dma_buf *dmabuf, + struct dma_buf_attachment *attachment) +{ + struct tee_shm *shm = dmabuf->priv; + struct tee_rstmem_attachment *a; + int rc; + + a = kzalloc(sizeof(*a), GFP_KERNEL); + if (!a) + return -ENOMEM; + + if (shm->pages) { + rc = sg_alloc_table_from_pages(&a->table, shm->pages, + shm->num_pages, 0, + shm->num_pages * PAGE_SIZE, + GFP_KERNEL); + if (rc) + goto err; + } else { + rc = sg_alloc_table(&a->table, 1, GFP_KERNEL); + if (rc) + goto err; + sg_set_page(a->table.sgl, phys_to_page(shm->paddr), shm->size, + 0); + } + + a->dev = attachment->dev; + attachment->priv = a; + + return 0; +err: + kfree(a); + return rc; +} + +static void rstmem_dma_detach(struct dma_buf *dmabuf, + struct dma_buf_attachment *attachment) +{ + struct tee_rstmem_attachment *a = attachment->priv; + + sg_free_table(&a->table); + kfree(a); +} + +static struct sg_table * +rstmem_dma_map_dma_buf(struct dma_buf_attachment *attachment, + enum dma_data_direction direction) +{ + struct tee_rstmem_attachment *a = attachment->priv; + int ret; + + ret = dma_map_sgtable(attachment->dev, &a->table, direction, + DMA_ATTR_SKIP_CPU_SYNC); + if (ret) + return ERR_PTR(ret); + + return &a->table; +} + +static void rstmem_dma_unmap_dma_buf(struct dma_buf_attachment *attachment, + struct sg_table *table, + enum dma_data_direction direction) +{ + struct tee_rstmem_attachment *a = attachment->priv; + + WARN_ON(&a->table != table); + + dma_unmap_sgtable(attachment->dev, table, direction, + DMA_ATTR_SKIP_CPU_SYNC); +} + +static int rstmem_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, + enum dma_data_direction direction) +{ + return -EPERM; +} + +static int rstmem_dma_buf_end_cpu_access(struct dma_buf *dmabuf, + enum dma_data_direction direction) +{ + return -EPERM; +} + +static int rstmem_dma_buf_mmap(struct dma_buf *dmabuf, + struct vm_area_struct *vma) +{ + return -EPERM; +} + +static void rstmem_dma_buf_free(struct dma_buf *dmabuf) +{ + struct tee_shm *shm = dmabuf->priv; + + tee_shm_put(shm); +} + +static const struct dma_buf_ops rstmem_generic_buf_ops = { + .attach = rstmem_dma_attach, + .detach = rstmem_dma_detach, + .map_dma_buf = rstmem_dma_map_dma_buf, + .unmap_dma_buf = rstmem_dma_unmap_dma_buf, + .begin_cpu_access = rstmem_dma_buf_begin_cpu_access, + .end_cpu_access = rstmem_dma_buf_end_cpu_access, + .mmap = rstmem_dma_buf_mmap, + .release = rstmem_dma_buf_free, +}; + +struct dma_buf *tee_rstmem_alloc(struct tee_context *ctx, u32 flags, + u32 use_case, size_t size, int *shm_id) +{ + struct tee_device *teedev = ctx->teedev; + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + struct dma_buf *dmabuf; + struct tee_shm *shm; + void *ret; + int rc; + + if (!tee_device_get(teedev)) + return ERR_PTR(-EINVAL); + + if (!teedev->desc->ops->rstmem_alloc || + !teedev->desc->ops->rstmem_free) { + dmabuf = ERR_PTR(-EINVAL); + goto err; + } + + shm = kzalloc(sizeof(*shm), GFP_KERNEL); + if (!shm) { + dmabuf = ERR_PTR(-ENOMEM); + goto err; + } + + refcount_set(&shm->refcount, 1); + shm->flags = TEE_SHM_RESTRICTED; + shm->use_case = use_case; + shm->ctx = ctx; + + mutex_lock(&teedev->mutex); + shm->id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL); + mutex_unlock(&teedev->mutex); + if (shm->id < 0) { + dmabuf = ERR_PTR(shm->id); + goto err_kfree; + } + + rc = teedev->desc->ops->rstmem_alloc(ctx, shm, flags, use_case, size); + if (rc) { + dmabuf = ERR_PTR(rc); + goto err_idr_remove; + } + + mutex_lock(&teedev->mutex); + ret = idr_replace(&teedev->idr, shm, shm->id); + mutex_unlock(&teedev->mutex); + if (IS_ERR(ret)) { + dmabuf = ret; + goto err_rstmem_free; + } + teedev_ctx_get(ctx); + + exp_info.ops = &rstmem_generic_buf_ops; + exp_info.size = shm->size; + exp_info.priv = shm; + dmabuf = dma_buf_export(&exp_info); + if (IS_ERR(dmabuf)) { + tee_shm_put(shm); + return dmabuf; + } + + *shm_id = shm->id; + return dmabuf; + +err_rstmem_free: + teedev->desc->ops->rstmem_free(ctx, shm); +err_idr_remove: + mutex_lock(&teedev->mutex); + idr_remove(&teedev->idr, shm->id); + mutex_unlock(&teedev->mutex); +err_kfree: + kfree(shm); +err: + tee_device_put(teedev); + return dmabuf; +} diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index daf6e5cfd59a..416f7f25d885 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -55,6 +55,8 @@ static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm) "unregister shm %p failed: %d", shm, rc);

release_registered_pages(shm); + } else if (shm->flags & TEE_SHM_RESTRICTED) { + teedev->desc->ops->rstmem_free(shm->ctx, shm); }

teedev_ctx_put(shm->ctx); diff --git a/drivers/tee/tee_shm_pool.c b/drivers/tee/tee_shm_pool.c index 80004b55628d..ee57ef157a77 100644 --- a/drivers/tee/tee_shm_pool.c +++ b/drivers/tee/tee_shm_pool.c @@ -1,9 +1,8 @@ // SPDX-License-Identifier: GPL-2.0-only /* - * Copyright (c) 2015, 2017, 2022 Linaro Limited + * Copyright (c) 2015, 2017, 2022, 2024 Linaro Limited */ #include <linux/device.h> -#include <linux/dma-buf.h> #include <linux/genalloc.h> #include <linux/slab.h> #include <linux/tee_core.h> @@ -90,3 +89,69 @@ struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr, return ERR_PTR(rc); } EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem); + +static int rstmem_pool_op_gen_alloc(struct tee_shm_pool *pool, + struct tee_shm *shm, size_t size, + size_t align) +{ + size_t sz = ALIGN(size, PAGE_SIZE); + phys_addr_t pa; + + pa = gen_pool_alloc(pool->private_data, sz); + if (!pa) + return -ENOMEM; + + shm->size = sz; + shm->paddr = pa; + + return 0; +} + +static void rstmem_pool_op_gen_free(struct tee_shm_pool *pool, + struct tee_shm *shm) +{ + gen_pool_free(pool->private_data, shm->paddr, shm->size); + shm->paddr = 0; +} + +static struct tee_shm_pool_ops rstmem_pool_ops_generic = { + .alloc = rstmem_pool_op_gen_alloc, + .free = rstmem_pool_op_gen_free, + .destroy_pool = pool_op_gen_destroy_pool, +}; + +struct tee_shm_pool *tee_rstmem_gen_pool_alloc(phys_addr_t paddr, size_t size) +{ + const size_t page_mask = PAGE_SIZE - 1; + struct tee_shm_pool *pool; + int rc; + + /* Check it's page aligned */ + if ((paddr | size) & page_mask) + return ERR_PTR(-EINVAL); + + pool = kzalloc(sizeof(*pool), GFP_KERNEL); + if (!pool) + return ERR_PTR(-ENOMEM); + + pool->private_data = gen_pool_create(PAGE_SHIFT, -1); + if (!pool->private_data) { + rc = -ENOMEM; + goto err_free; + } + + rc = gen_pool_add(pool->private_data, paddr, size, -1); + if (rc) + goto err_free_pool; + + pool->ops = &rstmem_pool_ops_generic; + return pool; + +err_free_pool: + gen_pool_destroy(pool->private_data); +err_free: + kfree(pool); + + return ERR_PTR(rc); +} +EXPORT_SYMBOL_GPL(tee_rstmem_gen_pool_alloc); diff --git a/include/linux/tee_core.h b/include/linux/tee_core.h index a38494d6b5f4..608302f494fe 100644 --- a/include/linux/tee_core.h +++ b/include/linux/tee_core.h @@ -26,6 +26,7 @@ #define TEE_SHM_USER_MAPPED BIT(1) /* Memory mapped in user space */ #define TEE_SHM_POOL BIT(2) /* Memory allocated from pool */ #define TEE_SHM_PRIV BIT(3) /* Memory private to TEE driver */ +#define TEE_SHM_RESTRICTED BIT(4) /* Restricted memory */

#define TEE_DEVICE_FLAG_REGISTERED 0x1 #define TEE_MAX_DEV_NAME_LEN 32 @@ -76,6 +77,8 @@ struct tee_device { * @supp_send: called for supplicant to send a response * @shm_register: register shared memory buffer in TEE * @shm_unregister: unregister shared memory buffer in TEE + * @rstmem_alloc: allocate restricted memory + * @rstmem_free: free restricted memory */ struct tee_driver_ops { void (*get_version)(struct tee_device *teedev, @@ -99,6 +102,9 @@ struct tee_driver_ops { struct page **pages, size_t num_pages, unsigned long start); int (*shm_unregister)(struct tee_context *ctx, struct tee_shm *shm); + int (*rstmem_alloc)(struct tee_context *ctx, struct tee_shm *shm, + u32 flags, u32 use_case, size_t size); + void (*rstmem_free)(struct tee_context *ctx, struct tee_shm *shm); };

/** @@ -229,6 +235,15 @@ static inline void tee_shm_pool_free(struct tee_shm_pool *pool) pool->ops->destroy_pool(pool); }

+/** + * tee_rstmem_gen_pool_alloc() - Create a restricted memory manager + * @paddr: Physical address of start of pool + * @size: Size in bytes of the pool + * + * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure. + */ +struct tee_shm_pool *tee_rstmem_gen_pool_alloc(phys_addr_t paddr, size_t size); + /** * tee_get_drvdata() - Return driver_data pointer * @returns the driver_data pointer supplied to tee_register(). diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index a54c203000ed..cba067715d14 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -55,6 +55,7 @@ struct tee_context { * @pages: locked pages from userspace * @num_pages: number of locked pages * @refcount: reference counter + * @use_case: defined by TEE_IOC_UC_* in tee.h * @flags: defined by TEE_SHM_* in tee_core.h * @id: unique id of a shared memory object on this device, shared * with user space @@ -71,6 +72,7 @@ struct tee_shm { struct page **pages; size_t num_pages; refcount_t refcount; + u32 use_case; u32 flags; int id; u64 sec_world_id; diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h index d0430bee8292..88834448debb 100644 --- a/include/uapi/linux/tee.h +++ b/include/uapi/linux/tee.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2015-2016, Linaro Limited + * Copyright (c) 2015-2017, 2020, 2024, Linaro Limited * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -48,6 +48,7 @@ #define TEE_GEN_CAP_PRIVILEGED (1 << 1)/* Privileged device (for supplicant) */ #define TEE_GEN_CAP_REG_MEM (1 << 2)/* Supports registering shared memory */ #define TEE_GEN_CAP_MEMREF_NULL (1 << 3)/* NULL MemRef support */ +#define TEE_GEN_CAP_RSTMEM (1 << 4)/* Supports restricted memory */

#define TEE_MEMREF_NULL (__u64)(-1) /* NULL MemRef Buffer */

@@ -389,6 +390,47 @@ struct tee_ioctl_shm_register_data { */ #define TEE_IOC_SHM_REGISTER _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 9, \ struct tee_ioctl_shm_register_data) + +#define TEE_IOC_UC_RESERVED 0 +#define TEE_IOC_UC_SECURE_VIDEO_PLAY 1 +#define TEE_IOC_UC_TRUSTED_UI 2 +#define TEE_IOC_UC_SECURE_VIDEO_RECORD 3 + +/** + * struct tee_ioctl_rstmem_alloc_data - Restricted memory allocate argument + * @size: [in/out] Size of restricted memory to allocate + * @flags: [in/out] Flags to/from allocate + * @use_case [in] Restricted memory use case, TEE_IOC_UC_* + * @id: [out] Identifier of the restricted memory + */ +struct tee_ioctl_rstmem_alloc_data { + __u64 size; + __u32 flags; + __u32 use_case; + __s32 id; +}; + +/** + * TEE_IOC_RSTMEM_ALLOC - allocate restricted memory + * + * Allocates restricted physically memory normally not accessible by the + * kernel. + * + * Restricted memory refers to memory buffers behind a hardware enforced + * firewall. It is not accessible to the kernel during normal circumstances + * but rather only accessible to certain hardware IPs or CPUs executing in + * higher privileged mode than the kernel itself. This interface allows to + * allocate and manage such restricted memory buffers via interaction with + * a TEE implementation. + * + * Returns a file descriptor on success or < 0 on failure + * + * The returned file descriptor is a dma-buf that can be attached and + * mapped for device with permission to access the physical memory. + */ +#define TEE_IOC_RSTMEM_ALLOC _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 10, \ + struct tee_ioctl_rstmem_alloc_data) + /* * Five syscalls are used when communicating with the TEE driver. * open(): opens the device associated with the driver

Update the header files describing the secure world ABI, both with and without FF-A. The ABI is extended to deal with restricted memory, but as usual backward compatible.

Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/optee_ffa.h | 27 ++++++++++--- drivers/tee/optee/optee_msg.h | 65 ++++++++++++++++++++++++++++++-- drivers/tee/optee/optee_smc.h | 71 ++++++++++++++++++++++++++++++++++- 3 files changed, 154 insertions(+), 9 deletions(-)

diff --git a/drivers/tee/optee/optee_ffa.h b/drivers/tee/optee/optee_ffa.h index 257735ae5b56..7bd037200343 100644 --- a/drivers/tee/optee/optee_ffa.h +++ b/drivers/tee/optee/optee_ffa.h @@ -81,7 +81,7 @@ * as the second MSG arg struct for * OPTEE_FFA_YIELDING_CALL_WITH_ARG. * Bit[31:8]: Reserved (MBZ) - * w5: Bitfield of secure world capabilities OPTEE_FFA_SEC_CAP_* below, + * w5: Bitfield of OP-TEE capabilities OPTEE_FFA_SEC_CAP_* * w6: The maximum secure world notification number * w7: Not used (MBZ) */ @@ -94,6 +94,8 @@ #define OPTEE_FFA_SEC_CAP_ASYNC_NOTIF BIT(1) /* OP-TEE supports probing for RPMB device if needed */ #define OPTEE_FFA_SEC_CAP_RPMB_PROBE BIT(2) +/* OP-TEE supports Restricted Memory for secure data path */ +#define OPTEE_FFA_SEC_CAP_RSTMEM BIT(3)

#define OPTEE_FFA_EXCHANGE_CAPABILITIES OPTEE_FFA_BLOCKING_CALL(2)

@@ -108,7 +110,7 @@ * * Return register usage: * w3: Error code, 0 on success - * w4-w7: Note used (MBZ) + * w4-w7: Not used (MBZ) */ #define OPTEE_FFA_UNREGISTER_SHM OPTEE_FFA_BLOCKING_CALL(3)

@@ -119,16 +121,31 @@ * Call register usage: * w3: Service ID, OPTEE_FFA_ENABLE_ASYNC_NOTIF * w4: Notification value to request bottom half processing, should be - * less than OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE. + * less than OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE * w5-w7: Not used (MBZ) * * Return register usage: * w3: Error code, 0 on success - * w4-w7: Note used (MBZ) + * w4-w7: Not used (MBZ) */ #define OPTEE_FFA_ENABLE_ASYNC_NOTIF OPTEE_FFA_BLOCKING_CALL(5)

-#define OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE 64 +#define OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE 64 + +/* + * Release Restricted memory + * + * Call register usage: + * w3: Service ID, OPTEE_FFA_RECLAIM_RSTMEM + * w4: Shared memory handle, lower bits + * w5: Shared memory handle, higher bits + * w6-w7: Not used (MBZ) + * + * Return register usage: + * w3: Error code, 0 on success + * w4-w7: Note used (MBZ) + */ +#define OPTEE_FFA_RELEASE_RSTMEM OPTEE_FFA_BLOCKING_CALL(8)

/* * Call with struct optee_msg_arg as argument in the supplied shared memory diff --git a/drivers/tee/optee/optee_msg.h b/drivers/tee/optee/optee_msg.h index e8840a82b983..1b558526e7d9 100644 --- a/drivers/tee/optee/optee_msg.h +++ b/drivers/tee/optee/optee_msg.h @@ -133,13 +133,13 @@ struct optee_msg_param_rmem { };

/** - * struct optee_msg_param_fmem - ffa memory reference parameter + * struct optee_msg_param_fmem - FF-A memory reference parameter * @offs_lower: Lower bits of offset into shared memory reference * @offs_upper: Upper bits of offset into shared memory reference * @internal_offs: Internal offset into the first page of shared memory * reference * @size: Size of the buffer - * @global_id: Global identifier of Shared memory + * @global_id: Global identifier of the shared memory */ struct optee_msg_param_fmem { u32 offs_low; @@ -165,7 +165,7 @@ struct optee_msg_param_value { * @attr: attributes * @tmem: parameter by temporary memory reference * @rmem: parameter by registered memory reference - * @fmem: parameter by ffa registered memory reference + * @fmem: parameter by FF-A registered memory reference * @value: parameter by opaque value * @octets: parameter by octet string * @@ -296,6 +296,18 @@ struct optee_msg_arg { */ #define OPTEE_MSG_FUNCID_GET_OS_REVISION 0x0001

+/* + * Values used in OPTEE_MSG_CMD_LEND_RSTMEM below + * OPTEE_MSG_RSTMEM_RESERVED Reserved + * OPTEE_MSG_RSTMEM_SECURE_VIDEO_PLAY Secure Video Playback + * OPTEE_MSG_RSTMEM_TRUSTED_UI Trused UI + * OPTEE_MSG_RSTMEM_SECURE_VIDEO_RECORD Secure Video Recording + */ +#define OPTEE_MSG_RSTMEM_RESERVED 0 +#define OPTEE_MSG_RSTMEM_SECURE_VIDEO_PLAY 1 +#define OPTEE_MSG_RSTMEM_TRUSTED_UI 2 +#define OPTEE_MSG_RSTMEM_SECURE_VIDEO_RECORD 3 + /* * Do a secure call with struct optee_msg_arg as argument * The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd @@ -337,6 +349,49 @@ struct optee_msg_arg { * OPTEE_MSG_CMD_STOP_ASYNC_NOTIF informs secure world that from now is * normal world unable to process asynchronous notifications. Typically * used when the driver is shut down. + * + * OPTEE_MSG_CMD_LEND_RSTMEM lends restricted memory. The passed normal + * physical memory is restricted from normal world access. The memory + * should be unmapped prior to this call since it becomes inaccessible + * during the request. + * Parameters are passed as: + * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + * [in] param[0].u.value.a OPTEE_MSG_RSTMEM_* defined above + * [in] param[1].attr OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + * [in] param[1].u.tmem.buf_ptr physical address + * [in] param[1].u.tmem.size size + * [in] param[1].u.tmem.shm_ref holds restricted memory reference + * + * OPTEE_MSG_CMD_RECLAIM_RSTMEM reclaims a previously lent restricted + * memory reference. The physical memory is accessible by the normal world + * after this function has return and can be mapped again. The information + * is passed as: + * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + * [in] param[0].u.value.a holds restricted memory cookie + * + * OPTEE_MSG_CMD_GET_RSTMEM_CONFIG get configuration for a specific + * restricted memory use case. Parameters are passed as: + * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_VALUE_INOUT + * [in] param[0].value.a OPTEE_MSG_RSTMEM_* + * [in] param[1].attr OPTEE_MSG_ATTR_TYPE_{R,F}MEM_OUTPUT + * [in] param[1].u.{r,f}mem Buffer or NULL + * [in] param[1].u.{r,f}mem.size Provided size of buffer or 0 for query + * output for the restricted use case: + * [out] param[0].value.a Minimal size of SDP memory + * [out] param[0].value.b Required alignment of size and start of + * restricted memory + * [out] param[1].{r,f}mem.size Size of output data + * [out] param[1].{r,f}mem If non-NULL, contains an array of + * uint16_t holding endpoints that + * must be included when lending + * memory for this use case + * + * OPTEE_MSG_CMD_ASSIGN_RSTMEM assigns use-case to restricted memory + * previously lent using the FFA_LEND framework ABI. Parameters are passed + * as: + * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + * [in] param[0].u.value.a holds restricted memory cookie + * [in] param[0].u.value.b OPTEE_MSG_RSTMEM_* defined above */ #define OPTEE_MSG_CMD_OPEN_SESSION 0 #define OPTEE_MSG_CMD_INVOKE_COMMAND 1 @@ -346,6 +401,10 @@ struct optee_msg_arg { #define OPTEE_MSG_CMD_UNREGISTER_SHM 5 #define OPTEE_MSG_CMD_DO_BOTTOM_HALF 6 #define OPTEE_MSG_CMD_STOP_ASYNC_NOTIF 7 +#define OPTEE_MSG_CMD_LEND_RSTMEM 8 +#define OPTEE_MSG_CMD_RECLAIM_RSTMEM 9 +#define OPTEE_MSG_CMD_GET_RSTMEM_CONFIG 10 +#define OPTEE_MSG_CMD_ASSIGN_RSTMEM 11 #define OPTEE_MSG_FUNCID_CALL_WITH_ARG 0x0004

#endif /* _OPTEE_MSG_H */ diff --git a/drivers/tee/optee/optee_smc.h b/drivers/tee/optee/optee_smc.h index 879426300821..abc379ce190c 100644 --- a/drivers/tee/optee/optee_smc.h +++ b/drivers/tee/optee/optee_smc.h @@ -264,7 +264,6 @@ struct optee_smc_get_shm_config_result { #define OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM BIT(0) /* Secure world can communicate via previously unregistered shared memory */ #define OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM BIT(1) - /* * Secure world supports commands "register/unregister shared memory", * secure world accepts command buffers located in any parts of non-secure RAM @@ -280,6 +279,10 @@ struct optee_smc_get_shm_config_result { #define OPTEE_SMC_SEC_CAP_RPC_ARG BIT(6) /* Secure world supports probing for RPMB device if needed */ #define OPTEE_SMC_SEC_CAP_RPMB_PROBE BIT(7) +/* Secure world supports Secure Data Path */ +#define OPTEE_SMC_SEC_CAP_SDP BIT(8) +/* Secure world supports dynamic restricted memory */ +#define OPTEE_SMC_SEC_CAP_DYNAMIC_RSTMEM BIT(9)

#define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES 9 #define OPTEE_SMC_EXCHANGE_CAPABILITIES \ @@ -451,6 +454,72 @@ struct optee_smc_disable_shm_cache_result {

/* See OPTEE_SMC_CALL_WITH_REGD_ARG above */ #define OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG 19 +/* + * Get Secure Data Path memory config + * + * Returns the Secure Data Path memory config. + * + * Call register usage: + * a0 SMC Function ID, OPTEE_SMC_GET_SDP_CONFIG + * a2-6 Not used, must be zero + * a7 Hypervisor Client ID register + * + * Have config return register usage: + * a0 OPTEE_SMC_RETURN_OK + * a1 Physical address of start of SDP memory + * a2 Size of SDP memory + * a3 Not used + * a4-7 Preserved + * + * Not available register usage: + * a0 OPTEE_SMC_RETURN_ENOTAVAIL + * a1-3 Not used + * a4-7 Preserved + */ +#define OPTEE_SMC_FUNCID_GET_SDP_CONFIG 20 +#define OPTEE_SMC_GET_SDP_CONFIG \ + OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_SDP_CONFIG) + +struct optee_smc_get_sdp_config_result { + unsigned long status; + unsigned long start; + unsigned long size; + unsigned long flags; +}; + +/* + * Get Secure Data Path dynamic memory config + * + * Returns the Secure Data Path dynamic memory config. + * + * Call register usage: + * a0 SMC Function ID, OPTEE_SMC_GET_DYN_SHM_CONFIG + * a2-6 Not used, must be zero + * a7 Hypervisor Client ID register + * + * Have config return register usage: + * a0 OPTEE_SMC_RETURN_OK + * a1 Minamal size of SDP memory + * a2 Required alignment of size and start of registered SDP memory + * a3 Not used + * a4-7 Preserved + * + * Not available register usage: + * a0 OPTEE_SMC_RETURN_ENOTAVAIL + * a1-3 Not used + * a4-7 Preserved + */ + +#define OPTEE_SMC_FUNCID_GET_DYN_SDP_CONFIG 21 +#define OPTEE_SMC_GET_DYN_SDP_CONFIG \ + OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_DYN_SDP_CONFIG) + +struct optee_smc_get_dyn_sdp_config_result { + unsigned long status; + unsigned long size; + unsigned long align; + unsigned long flags; +};

/* * Resume from RPC (for example after processing a foreign interrupt)

Add support in the OP-TEE backend driver dynamic restricted memory allocation with FF-A.

The restricted memory pools for dynamically allocated restrict memory are instantiated when requested by user-space. This instantiation can fail if OP-TEE doesn't support the requested use-case of restricted memory.

Restricted memory pools based on a static carveout or dynamic allocation can coexist for different use-cases. We use only dynamic allocation with FF-A.

Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/ffa_abi.c | 135 ++++++++++++- drivers/tee/optee/optee_private.h | 10 +- drivers/tee/optee/rstmem.c | 316 +++++++++++++++++++++++++++++- 3 files changed, 457 insertions(+), 4 deletions(-)

diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c index 02e6175ac5f0..f500cf101c8d 100644 --- a/drivers/tee/optee/ffa_abi.c +++ b/drivers/tee/optee/ffa_abi.c @@ -672,6 +672,122 @@ static int optee_ffa_do_call_with_arg(struct tee_context *ctx, return optee_ffa_yielding_call(ctx, &data, rpc_arg, system_thread); }

+static int do_call_lend_rstmem(struct optee *optee, u64 cookie, u32 use_case) +{ + struct optee_shm_arg_entry *entry; + struct optee_msg_arg *msg_arg; + struct tee_shm *shm; + u_int offs; + int rc; + + msg_arg = optee_get_msg_arg(optee->ctx, 1, &entry, &shm, &offs); + if (IS_ERR(msg_arg)) + return PTR_ERR(msg_arg); + + msg_arg->cmd = OPTEE_MSG_CMD_ASSIGN_RSTMEM; + msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT; + msg_arg->params[0].u.value.a = cookie; + msg_arg->params[0].u.value.b = use_case; + + rc = optee->ops->do_call_with_arg(optee->ctx, shm, offs, false); + if (rc) + goto out; + if (msg_arg->ret != TEEC_SUCCESS) { + rc = -EINVAL; + goto out; + } + +out: + optee_free_msg_arg(optee->ctx, entry, offs); + return rc; +} + +static int optee_ffa_lend_rstmem(struct optee *optee, struct tee_shm *rstmem, + u16 *end_points, unsigned int ep_count) +{ + struct ffa_device *ffa_dev = optee->ffa.ffa_dev; + const struct ffa_mem_ops *mem_ops = ffa_dev->ops->mem_ops; + const struct ffa_msg_ops *msg_ops = ffa_dev->ops->msg_ops; + struct ffa_send_direct_data data; + struct ffa_mem_region_attributes *mem_attr; + struct ffa_mem_ops_args args = { + .use_txbuf = true, + .tag = rstmem->use_case, + }; + struct page *page; + struct scatterlist sgl; + unsigned int n; + int rc; + + mem_attr = kcalloc(ep_count, sizeof(*mem_attr), GFP_KERNEL); + for (n = 0; n < ep_count; n++) { + mem_attr[n].receiver = end_points[n]; + mem_attr[n].attrs = FFA_MEM_RW; + } + args.attrs = mem_attr; + args.nattrs = ep_count; + + page = phys_to_page(rstmem->paddr); + sg_init_table(&sgl, 1); + sg_set_page(&sgl, page, rstmem->size, 0); + + args.sg = &sgl; + rc = mem_ops->memory_lend(&args); + kfree(mem_attr); + if (rc) + return rc; + + rc = do_call_lend_rstmem(optee, args.g_handle, rstmem->use_case); + if (rc) + goto err_reclaim; + + rc = optee_shm_add_ffa_handle(optee, rstmem, args.g_handle); + if (rc) + goto err_unreg; + + rstmem->sec_world_id = args.g_handle; + + return 0; + +err_unreg: + data = (struct ffa_send_direct_data){ + .data0 = OPTEE_FFA_RELEASE_RSTMEM, + .data1 = (u32)args.g_handle, + .data2 = (u32)(args.g_handle >> 32), + }; + msg_ops->sync_send_receive(ffa_dev, &data); +err_reclaim: + mem_ops->memory_reclaim(args.g_handle, 0); + return rc; +} + +static int optee_ffa_reclaim_rstmem(struct optee *optee, struct tee_shm *rstmem) +{ + struct ffa_device *ffa_dev = optee->ffa.ffa_dev; + const struct ffa_msg_ops *msg_ops = ffa_dev->ops->msg_ops; + const struct ffa_mem_ops *mem_ops = ffa_dev->ops->mem_ops; + u64 global_handle = rstmem->sec_world_id; + struct ffa_send_direct_data data = { + .data0 = OPTEE_FFA_RELEASE_RSTMEM, + .data1 = (u32)global_handle, + .data2 = (u32)(global_handle >> 32) + }; + int rc; + + optee_shm_rem_ffa_handle(optee, global_handle); + rstmem->sec_world_id = 0; + + rc = msg_ops->sync_send_receive(ffa_dev, &data); + if (rc) + pr_err("Release SHM id 0x%llx rc %d\n", global_handle, rc); + + rc = mem_ops->memory_reclaim(global_handle, 0); + if (rc) + pr_err("mem_reclaim: 0x%llx %d", global_handle, rc); + + return rc; +} + /* * 6. Driver initialization * @@ -785,7 +901,10 @@ static void optee_ffa_get_version(struct tee_device *teedev, .gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM | TEE_GEN_CAP_MEMREF_NULL, }; + struct optee *optee = tee_get_drvdata(teedev);

+ if (optee->rstmem_pools) + v.gen_caps |= TEE_GEN_CAP_RSTMEM; *vers = v; }

@@ -804,6 +923,8 @@ static const struct tee_driver_ops optee_ffa_clnt_ops = { .cancel_req = optee_cancel_req, .shm_register = optee_ffa_shm_register, .shm_unregister = optee_ffa_shm_unregister, + .rstmem_alloc = optee_rstmem_alloc, + .rstmem_free = optee_rstmem_free, };

static const struct tee_desc optee_ffa_clnt_desc = { @@ -820,6 +941,8 @@ static const struct tee_driver_ops optee_ffa_supp_ops = { .supp_send = optee_supp_send, .shm_register = optee_ffa_shm_register, /* same as for clnt ops */ .shm_unregister = optee_ffa_shm_unregister_supp, + .rstmem_alloc = optee_rstmem_alloc, + .rstmem_free = optee_rstmem_free, };

static const struct tee_desc optee_ffa_supp_desc = { @@ -833,6 +956,8 @@ static const struct optee_ops optee_ffa_ops = { .do_call_with_arg = optee_ffa_do_call_with_arg, .to_msg_param = optee_ffa_to_msg_param, .from_msg_param = optee_ffa_from_msg_param, + .lend_rstmem = optee_ffa_lend_rstmem, + .reclaim_rstmem = optee_ffa_reclaim_rstmem, };

static void optee_ffa_remove(struct ffa_device *ffa_dev) @@ -937,11 +1062,17 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev) (sec_caps & OPTEE_FFA_SEC_CAP_RPMB_PROBE)) optee->in_kernel_rpmb_routing = true;

+ if (sec_caps & OPTEE_FFA_SEC_CAP_RSTMEM) { + rc = optee_rstmem_pools_init(optee); + if (rc) + goto err_free_pool; + } + teedev = tee_device_alloc(&optee_ffa_clnt_desc, NULL, optee->pool, optee); if (IS_ERR(teedev)) { rc = PTR_ERR(teedev); - goto err_free_pool; + goto err_free_rstmem_pools; } optee->teedev = teedev;

@@ -1020,6 +1151,8 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev) tee_device_unregister(optee->teedev); err_free_pool: tee_shm_pool_free(pool); +err_free_rstmem_pools: + optee_rstmem_pools_uninit(optee); err_free_optee: kfree(optee); return rc; diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h index 0491889e5b0e..dd2a3a2224bc 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -174,9 +174,14 @@ struct optee; * @do_call_with_arg: enters OP-TEE in secure world * @to_msg_param: converts from struct tee_param to OPTEE_MSG parameters * @from_msg_param: converts from OPTEE_MSG parameters to struct tee_param + * @lend_rstmem: lends physically contiguous memory as restricted + * memory, inaccessible by the kernel + * @reclaim_rstmem: reclaims restricted memory previously lent with + * @lend_rstmem() and makes it accessible by the + * kernel again * * These OPs are only supposed to be used internally in the OP-TEE driver - * as a way of abstracting the different methogs of entering OP-TEE in + * as a way of abstracting the different methods of entering OP-TEE in * secure world. */ struct optee_ops { @@ -191,6 +196,9 @@ struct optee_ops { size_t num_params, const struct optee_msg_param *msg_params, bool update_out); + int (*lend_rstmem)(struct optee *optee, struct tee_shm *rstmem, + u16 *end_points, unsigned int ep_count); + int (*reclaim_rstmem)(struct optee *optee, struct tee_shm *rstmem); };

/** diff --git a/drivers/tee/optee/rstmem.c b/drivers/tee/optee/rstmem.c index 01456bc3e2f6..8c561d638733 100644 --- a/drivers/tee/optee/rstmem.c +++ b/drivers/tee/optee/rstmem.c @@ -4,6 +4,7 @@ */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

+#include <linux/cma.h> #include <linux/dma-map-ops.h> #include <linux/errno.h> #include <linux/genalloc.h> @@ -13,11 +14,313 @@ #include <linux/types.h> #include "optee_private.h"

+#ifdef CONFIG_CMA +struct optee_rstmem_cma_pool { + struct tee_shm_pool pool; + struct page *page; + struct optee *optee; + size_t page_count; + u16 *end_points; + u_int end_point_count; + u_int align; + refcount_t refcount; + struct tee_shm rstmem; + /* Protects when initializing and tearing down this struct */ + struct mutex mutex; +}; + +static struct optee_rstmem_cma_pool * +to_rstmem_cma_pool(struct tee_shm_pool *pool) +{ + return container_of(pool, struct optee_rstmem_cma_pool, pool); +} + +static int init_cma_rstmem(struct optee_rstmem_cma_pool *rp) +{ + struct cma *cma = dev_get_cma_area(&rp->optee->teedev->dev); + int rc; + + rp->page = cma_alloc(cma, rp->page_count, rp->align, true/*no_warn*/); + if (!rp->page) + return -ENOMEM; + + /* + * TODO unmap the memory range since the physical memory will + * become inaccesible after the lend_rstmem() call. + */ + + rp->rstmem.paddr = page_to_phys(rp->page); + rp->rstmem.size = rp->page_count * PAGE_SIZE; + rc = rp->optee->ops->lend_rstmem(rp->optee, &rp->rstmem, + rp->end_points, rp->end_point_count); + if (rc) + goto err_release; + + rp->pool.private_data = gen_pool_create(PAGE_SHIFT, -1); + if (!rp->pool.private_data) { + rc = -ENOMEM; + goto err_reclaim; + } + + rc = gen_pool_add(rp->pool.private_data, rp->rstmem.paddr, + rp->rstmem.size, -1); + if (rc) + goto err_free_pool; + + refcount_set(&rp->refcount, 1); + return 0; + +err_free_pool: + gen_pool_destroy(rp->pool.private_data); +err_reclaim: + rp->optee->ops->reclaim_rstmem(rp->optee, &rp->rstmem); +err_release: + cma_release(cma, rp->page, rp->page_count); + rp->rstmem.paddr = 0; + rp->rstmem.size = 0; + rp->rstmem.sec_world_id = 0; + return rc; +} + +static int get_cma_rstmem(struct optee_rstmem_cma_pool *rp) +{ + int rc = 0; + + if (!refcount_inc_not_zero(&rp->refcount)) { + mutex_lock(&rp->mutex); + if (rp->pool.private_data) { + /* + * Another thread has already initialized the pool + * before us, or the pool was just about to be torn + * down. Either way we only need to increase the + * refcount and we're done. + */ + refcount_inc(&rp->refcount); + } else { + rc = init_cma_rstmem(rp); + } + mutex_unlock(&rp->mutex); + } + + return rc; +} + +static void release_cma_rstmem(struct optee_rstmem_cma_pool *rp) +{ + gen_pool_destroy(rp->pool.private_data); + rp->optee->ops->reclaim_rstmem(rp->optee, &rp->rstmem); + cma_release(dev_get_cma_area(&rp->optee->teedev->dev), rp->page, + rp->page_count); + + rp->pool.private_data = NULL; + rp->page = NULL; + rp->rstmem.paddr = 0; + rp->rstmem.size = 0; + rp->rstmem.sec_world_id = 0; +} + +static void put_cma_rstmem(struct optee_rstmem_cma_pool *rp) +{ + if (refcount_dec_and_test(&rp->refcount)) { + mutex_lock(&rp->mutex); + if (rp->pool.private_data) + release_cma_rstmem(rp); + mutex_unlock(&rp->mutex); + } +} + +static int rstmem_pool_op_cma_alloc(struct tee_shm_pool *pool, + struct tee_shm *shm, size_t size, + size_t align) +{ + struct optee_rstmem_cma_pool *rp = to_rstmem_cma_pool(pool); + size_t sz = ALIGN(size, PAGE_SIZE); + phys_addr_t pa; + int rc; + + rc = get_cma_rstmem(rp); + if (rc) + return rc; + + pa = gen_pool_alloc(rp->pool.private_data, sz); + if (!pa) { + put_cma_rstmem(rp); + return -ENOMEM; + } + + shm->size = sz; + shm->paddr = pa; + shm->offset = pa - page_to_phys(rp->page); + shm->sec_world_id = rp->rstmem.sec_world_id; + + return 0; +} + +static void rstmem_pool_op_cma_free(struct tee_shm_pool *pool, + struct tee_shm *shm) +{ + struct optee_rstmem_cma_pool *rp = to_rstmem_cma_pool(pool); + + gen_pool_free(rp->pool.private_data, shm->paddr, shm->size); + shm->size = 0; + shm->paddr = 0; + shm->offset = 0; + shm->sec_world_id = 0; + put_cma_rstmem(rp); +} + +static void pool_op_cma_destroy_pool(struct tee_shm_pool *pool) +{ + struct optee_rstmem_cma_pool *rp = to_rstmem_cma_pool(pool); + + mutex_destroy(&rp->mutex); + kfree(rp); +} + +static struct tee_shm_pool_ops rstmem_pool_ops_cma = { + .alloc = rstmem_pool_op_cma_alloc, + .free = rstmem_pool_op_cma_free, + .destroy_pool = pool_op_cma_destroy_pool, +}; + +static int get_rstmem_config(struct optee *optee, u32 use_case, + size_t *min_size, u_int *min_align, + u16 *end_points, u_int *ep_count) +{ + struct tee_param params[2] = { + [0] = { + .attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT, + .u.value.a = use_case, + }, + [1] = { + .attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT, + }, + }; + struct optee_shm_arg_entry *entry; + struct tee_shm *shm_param = NULL; + struct optee_msg_arg *msg_arg; + struct tee_shm *shm; + u_int offs; + int rc; + + if (end_points && *ep_count) { + params[1].u.memref.size = *ep_count * sizeof(*end_points); + shm_param = tee_shm_alloc_priv_buf(optee->ctx, + params[1].u.memref.size); + if (IS_ERR(shm_param)) + return PTR_ERR(shm_param); + params[1].u.memref.shm = shm_param; + } + + msg_arg = optee_get_msg_arg(optee->ctx, ARRAY_SIZE(params), &entry, + &shm, &offs); + if (IS_ERR(msg_arg)) { + rc = PTR_ERR(msg_arg); + goto out_free_shm; + } + msg_arg->cmd = OPTEE_MSG_CMD_GET_RSTMEM_CONFIG; + + rc = optee->ops->to_msg_param(optee, msg_arg->params, + ARRAY_SIZE(params), params, + false /*!update_out*/); + if (rc) + goto out_free_msg; + + rc = optee->ops->do_call_with_arg(optee->ctx, shm, offs, false); + if (rc) + goto out_free_msg; + if (msg_arg->ret && msg_arg->ret != TEEC_ERROR_SHORT_BUFFER) { + rc = -EINVAL; + goto out_free_msg; + } + + rc = optee->ops->from_msg_param(optee, params, ARRAY_SIZE(params), + msg_arg->params, true /*update_out*/); + if (rc) + goto out_free_msg; + + if (!msg_arg->ret && end_points && + *ep_count < params[1].u.memref.size / sizeof(u16)) { + rc = -EINVAL; + goto out_free_msg; + } + + *min_size = params[0].u.value.a; + *min_align = params[0].u.value.b; + *ep_count = params[1].u.memref.size / sizeof(u16); + + if (msg_arg->ret == TEEC_ERROR_SHORT_BUFFER) { + rc = -ENOSPC; + goto out_free_msg; + } + + if (end_points) + memcpy(end_points, tee_shm_get_va(shm_param, 0), + params[1].u.memref.size); + +out_free_msg: + optee_free_msg_arg(optee->ctx, entry, offs); +out_free_shm: + if (shm_param) + tee_shm_free(shm_param); + return rc; +} + +static struct tee_shm_pool *alloc_rstmem_pool(struct optee *optee, u32 use_case) +{ + struct optee_rstmem_cma_pool *rp; + size_t min_size; + int rc; + + rp = kzalloc(sizeof(*rp), GFP_KERNEL); + if (!rp) + return ERR_PTR(-ENOMEM); + rp->rstmem.use_case = use_case; + + rc = get_rstmem_config(optee, use_case, &min_size, &rp->align, NULL, + &rp->end_point_count); + if (rc) { + if (rc != -ENOSPC) + goto err; + rp->end_points = kcalloc(rp->end_point_count, + sizeof(*rp->end_points), GFP_KERNEL); + if (!rp->end_points) { + rc = -ENOMEM; + goto err; + } + rc = get_rstmem_config(optee, use_case, &min_size, &rp->align, + rp->end_points, &rp->end_point_count); + if (rc) + goto err_kfree_eps; + } + + rp->pool.ops = &rstmem_pool_ops_cma; + rp->optee = optee; + rp->page_count = min_size / PAGE_SIZE; + mutex_init(&rp->mutex); + + return &rp->pool; + +err_kfree_eps: + kfree(rp->end_points); +err: + kfree(rp); + return ERR_PTR(rc); +} +#else /*CONFIG_CMA*/ +static struct tee_shm_pool *alloc_rstmem_pool(struct optee *optee __unused, + u32 use_case __unused) +{ + return ERR_PTR(-EINVAL); +} +#endif /*CONFIG_CMA*/ + int optee_rstmem_alloc(struct tee_context *ctx, struct tee_shm *shm, u32 flags, u32 use_case, size_t size) { struct optee *optee = tee_get_drvdata(ctx->teedev); struct tee_shm_pool *pool; + int rc;

if (!optee->rstmem_pools) return -EINVAL; @@ -25,8 +328,17 @@ int optee_rstmem_alloc(struct tee_context *ctx, struct tee_shm *shm, return -EINVAL;

pool = xa_load(&optee->rstmem_pools->xa, use_case); - if (!pool) - return -EINVAL; + if (!pool) { + pool = alloc_rstmem_pool(optee, use_case); + if (IS_ERR(pool)) + return PTR_ERR(pool); + rc = xa_insert(&optee->rstmem_pools->xa, use_case, pool, + GFP_KERNEL); + if (rc) { + pool->ops->destroy_pool(pool); + return rc; + } + }

return pool->ops->alloc(pool, shm, size, 0); }