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gerrit.openbmc.org / stefanberger / openbmc / 2194f503e17619bcd36b4289902d13457aac638e / . / meta-arm / meta-arm-bsp / recipes-kernel / linux / linux-arm64-ack-5.15 / tc / 0011-optee-isolate-smc-abi.patch
blob: c2ac12a23a290513d2473cdd141da53327fa37c1 [file] [log] [blame]
From bfcb795efc2d07bf99fd6c6e4f43951bc7354d5e Mon Sep 17 00:00:00 2001
From: Jens Wiklander <jens.wiklander@linaro.org>
Date: Wed, 21 Jul 2021 16:30:28 +0200
Subject: [PATCH 11/40] optee: isolate smc abi
Isolate the ABI based on raw SMCs. Code specific to the raw SMC ABI is
moved into smc_abi.c. This makes room for other ABIs with a clear
separation.
The driver changes to use module_init()/module_exit() instead of
module_platform_driver(). The platform_driver_register() and
platform_driver_unregister() functions called directly to keep the same
behavior. This is needed because module_platform_driver() is based on
module_driver() which can only be used once in a module.
A function optee_rpc_cmd() is factored out from the function
handle_rpc_func_cmd() to handle the ABI independent part of RPC
processing.
This patch is not supposed to change the driver behavior, it's only a
matter of reorganizing the code.
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Upstream-Status: Pending [Not submitted to upstream yet]
Signed-off-by: Rupinderjit Singh <rupinderjit.singh@arm.com>
---
drivers/tee/optee/Makefile | 4 +-
drivers/tee/optee/call.c | 369 +-------
drivers/tee/optee/core.c | 721 ++-------------
drivers/tee/optee/optee_private.h | 106 ++-
drivers/tee/optee/rpc.c | 218 +----
drivers/tee/optee/shm_pool.h | 14 -
drivers/tee/optee/smc_abi.c | 1361 +++++++++++++++++++++++++++++
7 files changed, 1506 insertions(+), 1287 deletions(-)
delete mode 100644 drivers/tee/optee/shm_pool.h
create mode 100644 drivers/tee/optee/smc_abi.c
diff --git a/drivers/tee/optee/Makefile b/drivers/tee/optee/Makefile
index 3aa33ea9e6a6..97ac3ab3e1c0 100644
--- a/drivers/tee/optee/Makefile
+++ b/drivers/tee/optee/Makefile
@@ -4,8 +4,8 @@ optee-objs += core.o
optee-objs += call.o
optee-objs += rpc.o
optee-objs += supp.o
-optee-objs += shm_pool.o
optee-objs += device.o
+optee-objs += smc_abi.o
# for tracing framework to find optee_trace.h
-CFLAGS_call.o := -I$(src)
+CFLAGS_smc_abi.o := -I$(src)
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index ddedde45f1ee..9ff4f0812825 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -2,28 +2,17 @@
/*
* Copyright (c) 2015-2021, Linaro Limited
*/
-#include <linux/arm-smccc.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/mm.h>
-#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
-#include <linux/uaccess.h>
#include "optee_private.h"
-#include "optee_smc.h"
-#define CREATE_TRACE_POINTS
-#include "optee_trace.h"
-struct optee_call_waiter {
- struct list_head list_node;
- struct completion c;
-};
-
-static void optee_cq_wait_init(struct optee_call_queue *cq,
- struct optee_call_waiter *w)
+void optee_cq_wait_init(struct optee_call_queue *cq,
+ struct optee_call_waiter *w)
{
/*
* We're preparing to make a call to secure world. In case we can't
@@ -47,8 +36,8 @@ static void optee_cq_wait_init(struct optee_call_queue *cq,
mutex_unlock(&cq->mutex);
}
-static void optee_cq_wait_for_completion(struct optee_call_queue *cq,
- struct optee_call_waiter *w)
+void optee_cq_wait_for_completion(struct optee_call_queue *cq,
+ struct optee_call_waiter *w)
{
wait_for_completion(&w->c);
@@ -74,8 +63,8 @@ static void optee_cq_complete_one(struct optee_call_queue *cq)
}
}
-static void optee_cq_wait_final(struct optee_call_queue *cq,
- struct optee_call_waiter *w)
+void optee_cq_wait_final(struct optee_call_queue *cq,
+ struct optee_call_waiter *w)
{
/*
* We're done with the call to secure world. The thread in secure
@@ -115,73 +104,8 @@ static struct optee_session *find_session(struct optee_context_data *ctxdata,
return NULL;
}
-/**
- * optee_do_call_with_arg() - Do an SMC to OP-TEE in secure world
- * @ctx: calling context
- * @arg: shared memory holding the message to pass to secure world
- *
- * Does and SMC to OP-TEE in secure world and handles eventual resulting
- * Remote Procedure Calls (RPC) from OP-TEE.
- *
- * Returns return code from secure world, 0 is OK
- */
-int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg)
-{
- struct optee *optee = tee_get_drvdata(ctx->teedev);
- struct optee_call_waiter w;
- struct optee_rpc_param param = { };
- struct optee_call_ctx call_ctx = { };
- phys_addr_t parg;
- int rc;
-
- rc = tee_shm_get_pa(arg, 0, &parg);
- if (rc)
- return rc;
-
- param.a0 = OPTEE_SMC_CALL_WITH_ARG;
- reg_pair_from_64(&param.a1, &param.a2, parg);
- /* Initialize waiter */
- optee_cq_wait_init(&optee->call_queue, &w);
- while (true) {
- struct arm_smccc_res res;
-
- trace_optee_invoke_fn_begin(&param);
- optee->invoke_fn(param.a0, param.a1, param.a2, param.a3,
- param.a4, param.a5, param.a6, param.a7,
- &res);
- trace_optee_invoke_fn_end(&param, &res);
-
- if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) {
- /*
- * Out of threads in secure world, wait for a thread
- * become available.
- */
- optee_cq_wait_for_completion(&optee->call_queue, &w);
- } else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
- cond_resched();
- param.a0 = res.a0;
- param.a1 = res.a1;
- param.a2 = res.a2;
- param.a3 = res.a3;
- optee_handle_rpc(ctx, &param, &call_ctx);
- } else {
- rc = res.a0;
- break;
- }
- }
-
- optee_rpc_finalize_call(&call_ctx);
- /*
- * We're done with our thread in secure world, if there's any
- * thread waiters wake up one.
- */
- optee_cq_wait_final(&optee->call_queue, &w);
-
- return rc;
-}
-
-static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,
- struct optee_msg_arg **msg_arg)
+struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
+ struct optee_msg_arg **msg_arg)
{
struct tee_shm *shm;
struct optee_msg_arg *ma;
@@ -217,7 +141,7 @@ int optee_open_session(struct tee_context *ctx,
uuid_t client_uuid;
/* +2 for the meta parameters added below */
- shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg);
+ shm = optee_get_msg_arg(ctx, arg->num_params + 2, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
@@ -290,7 +214,7 @@ int optee_close_session_helper(struct tee_context *ctx, u32 session)
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_msg_arg *msg_arg;
- shm = get_msg_arg(ctx, 0, &msg_arg);
+ shm = optee_get_msg_arg(ctx, 0, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
@@ -338,7 +262,7 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
if (!sess)
return -EINVAL;
- shm = get_msg_arg(ctx, arg->num_params, &msg_arg);
+ shm = optee_get_msg_arg(ctx, arg->num_params, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
@@ -384,7 +308,7 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
if (!sess)
return -EINVAL;
- shm = get_msg_arg(ctx, 0, &msg_arg);
+ shm = optee_get_msg_arg(ctx, 0, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
@@ -397,182 +321,6 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
return 0;
}
-/**
- * optee_enable_shm_cache() - Enables caching of some shared memory allocation
- * in OP-TEE
- * @optee: main service struct
- */
-void optee_enable_shm_cache(struct optee *optee)
-{
- struct optee_call_waiter w;
-
- /* We need to retry until secure world isn't busy. */
- optee_cq_wait_init(&optee->call_queue, &w);
- while (true) {
- struct arm_smccc_res res;
-
- optee->invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
- 0, &res);
- if (res.a0 == OPTEE_SMC_RETURN_OK)
- break;
- optee_cq_wait_for_completion(&optee->call_queue, &w);
- }
- optee_cq_wait_final(&optee->call_queue, &w);
-}
-
-/**
- * __optee_disable_shm_cache() - Disables caching of some shared memory
- * allocation in OP-TEE
- * @optee: main service struct
- * @is_mapped: true if the cached shared memory addresses were mapped by this
- * kernel, are safe to dereference, and should be freed
- */
-static void __optee_disable_shm_cache(struct optee *optee, bool is_mapped)
-{
- struct optee_call_waiter w;
-
- /* We need to retry until secure world isn't busy. */
- optee_cq_wait_init(&optee->call_queue, &w);
- while (true) {
- union {
- struct arm_smccc_res smccc;
- struct optee_smc_disable_shm_cache_result result;
- } res;
-
- optee->invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
- 0, &res.smccc);
- if (res.result.status == OPTEE_SMC_RETURN_ENOTAVAIL)
- break; /* All shm's freed */
- if (res.result.status == OPTEE_SMC_RETURN_OK) {
- struct tee_shm *shm;
-
- /*
- * Shared memory references that were not mapped by
- * this kernel must be ignored to prevent a crash.
- */
- if (!is_mapped)
- continue;
-
- shm = reg_pair_to_ptr(res.result.shm_upper32,
- res.result.shm_lower32);
- tee_shm_free(shm);
- } else {
- optee_cq_wait_for_completion(&optee->call_queue, &w);
- }
- }
- optee_cq_wait_final(&optee->call_queue, &w);
-}
-
-/**
- * optee_disable_shm_cache() - Disables caching of mapped shared memory
- * allocations in OP-TEE
- * @optee: main service struct
- */
-void optee_disable_shm_cache(struct optee *optee)
-{
- return __optee_disable_shm_cache(optee, true);
-}
-
-/**
- * optee_disable_unmapped_shm_cache() - Disables caching of shared memory
- * allocations in OP-TEE which are not
- * currently mapped
- * @optee: main service struct
- */
-void optee_disable_unmapped_shm_cache(struct optee *optee)
-{
- return __optee_disable_shm_cache(optee, false);
-}
-
-#define PAGELIST_ENTRIES_PER_PAGE \
- ((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
-
-/**
- * optee_fill_pages_list() - write list of user pages to given shared
- * buffer.
- *
- * @dst: page-aligned buffer where list of pages will be stored
- * @pages: array of pages that represents shared buffer
- * @num_pages: number of entries in @pages
- * @page_offset: offset of user buffer from page start
- *
- * @dst should be big enough to hold list of user page addresses and
- * links to the next pages of buffer
- */
-void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
- size_t page_offset)
-{
- int n = 0;
- phys_addr_t optee_page;
- /*
- * Refer to OPTEE_MSG_ATTR_NONCONTIG description in optee_msg.h
- * for details.
- */
- struct {
- u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
- u64 next_page_data;
- } *pages_data;
-
- /*
- * Currently OP-TEE uses 4k page size and it does not looks
- * like this will change in the future. On other hand, there are
- * no know ARM architectures with page size < 4k.
- * Thus the next built assert looks redundant. But the following
- * code heavily relies on this assumption, so it is better be
- * safe than sorry.
- */
- BUILD_BUG_ON(PAGE_SIZE < OPTEE_MSG_NONCONTIG_PAGE_SIZE);
-
- pages_data = (void *)dst;
- /*
- * If linux page is bigger than 4k, and user buffer offset is
- * larger than 4k/8k/12k/etc this will skip first 4k pages,
- * because they bear no value data for OP-TEE.
- */
- optee_page = page_to_phys(*pages) +
- round_down(page_offset, OPTEE_MSG_NONCONTIG_PAGE_SIZE);
-
- while (true) {
- pages_data->pages_list[n++] = optee_page;
-
- if (n == PAGELIST_ENTRIES_PER_PAGE) {
- pages_data->next_page_data =
- virt_to_phys(pages_data + 1);
- pages_data++;
- n = 0;
- }
-
- optee_page += OPTEE_MSG_NONCONTIG_PAGE_SIZE;
- if (!(optee_page & ~PAGE_MASK)) {
- if (!--num_pages)
- break;
- pages++;
- optee_page = page_to_phys(*pages);
- }
- }
-}
-
-/*
- * The final entry in each pagelist page is a pointer to the next
- * pagelist page.
- */
-static size_t get_pages_list_size(size_t num_entries)
-{
- int pages = DIV_ROUND_UP(num_entries, PAGELIST_ENTRIES_PER_PAGE);
-
- return pages * OPTEE_MSG_NONCONTIG_PAGE_SIZE;
-}
-
-u64 *optee_allocate_pages_list(size_t num_entries)
-{
- return alloc_pages_exact(get_pages_list_size(num_entries), GFP_KERNEL);
-}
-
-void optee_free_pages_list(void *list, size_t num_entries)
-{
- free_pages_exact(list, get_pages_list_size(num_entries));
-}
-
static bool is_normal_memory(pgprot_t p)
{
#if defined(CONFIG_ARM)
@@ -596,7 +344,7 @@ static int __check_mem_type(struct vm_area_struct *vma, unsigned long end)
return -EINVAL;
}
-static int check_mem_type(unsigned long start, size_t num_pages)
+int optee_check_mem_type(unsigned long start, size_t num_pages)
{
struct mm_struct *mm = current->mm;
int rc;
@@ -615,94 +363,3 @@ static int check_mem_type(unsigned long start, size_t num_pages)
return rc;
}
-
-int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
- struct page **pages, size_t num_pages,
- unsigned long start)
-{
- struct optee *optee = tee_get_drvdata(ctx->teedev);
- struct optee_msg_arg *msg_arg;
- struct tee_shm *shm_arg;
- u64 *pages_list;
- int rc;
-
- if (!num_pages)
- return -EINVAL;
-
- rc = check_mem_type(start, num_pages);
- if (rc)
- return rc;
-
- pages_list = optee_allocate_pages_list(num_pages);
- if (!pages_list)
- return -ENOMEM;
-
- shm_arg = get_msg_arg(ctx, 1, &msg_arg);
- if (IS_ERR(shm_arg)) {
- rc = PTR_ERR(shm_arg);
- goto out;
- }
-
- optee_fill_pages_list(pages_list, pages, num_pages,
- tee_shm_get_page_offset(shm));
-
- msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
- msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
- OPTEE_MSG_ATTR_NONCONTIG;
- msg_arg->params->u.tmem.shm_ref = (unsigned long)shm;
- msg_arg->params->u.tmem.size = tee_shm_get_size(shm);
- /*
- * In the least bits of msg_arg->params->u.tmem.buf_ptr we
- * store buffer offset from 4k page, as described in OP-TEE ABI.
- */
- msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) |
- (tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
-
- if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
- msg_arg->ret != TEEC_SUCCESS)
- rc = -EINVAL;
-
- tee_shm_free(shm_arg);
-out:
- optee_free_pages_list(pages_list, num_pages);
- return rc;
-}
-
-int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
-{
- struct optee *optee = tee_get_drvdata(ctx->teedev);
- struct optee_msg_arg *msg_arg;
- struct tee_shm *shm_arg;
- int rc = 0;
-
- shm_arg = get_msg_arg(ctx, 1, &msg_arg);
- if (IS_ERR(shm_arg))
- return PTR_ERR(shm_arg);
-
- msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
-
- msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
- msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm;
-
- if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
- msg_arg->ret != TEEC_SUCCESS)
- rc = -EINVAL;
- tee_shm_free(shm_arg);
- return rc;
-}
-
-int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
- struct page **pages, size_t num_pages,
- unsigned long start)
-{
- /*
- * We don't want to register supplicant memory in OP-TEE.
- * Instead information about it will be passed in RPC code.
- */
- return check_mem_type(start, num_pages);
-}
-
-int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm)
-{
- return 0;
-}
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 26492d3115f5..27b855325b33 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -1,260 +1,71 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2021, Linaro Limited
+ * Copyright (c) 2016, EPAM Systems
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/arm-smccc.h>
#include <linux/crash_dump.h>
#include <linux/errno.h>
#include <linux/io.h>
+#include <linux/mm.h>
#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
-#include <linux/uaccess.h>
#include <linux/workqueue.h>
#include "optee_private.h"
-#include "optee_smc.h"
-#include "shm_pool.h"
-#define DRIVER_NAME "optee"
-
-#define OPTEE_SHM_NUM_PRIV_PAGES CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
-
-static void from_msg_param_value(struct tee_param *p, u32 attr,
- const struct optee_msg_param *mp)
-{
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
- p->u.value.a = mp->u.value.a;
- p->u.value.b = mp->u.value.b;
- p->u.value.c = mp->u.value.c;
-}
-
-static int from_msg_param_tmp_mem(struct tee_param *p, u32 attr,
- const struct optee_msg_param *mp)
-{
- struct tee_shm *shm;
- phys_addr_t pa;
- int rc;
-
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
- p->u.memref.size = mp->u.tmem.size;
- shm = (struct tee_shm *)(unsigned long)mp->u.tmem.shm_ref;
- if (!shm) {
- p->u.memref.shm_offs = 0;
- p->u.memref.shm = NULL;
- return 0;
- }
-
- rc = tee_shm_get_pa(shm, 0, &pa);
- if (rc)
- return rc;
-
- p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
- p->u.memref.shm = shm;
-
- /* Check that the memref is covered by the shm object */
- if (p->u.memref.size) {
- size_t o = p->u.memref.shm_offs +
- p->u.memref.size - 1;
-
- rc = tee_shm_get_pa(shm, o, NULL);
- if (rc)
- return rc;
- }
-
- return 0;
-}
-
-static void from_msg_param_reg_mem(struct tee_param *p, u32 attr,
- const struct optee_msg_param *mp)
+int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
+ struct tee_shm *shm, size_t size,
+ int (*shm_register)(struct tee_context *ctx,
+ struct tee_shm *shm,
+ struct page **pages,
+ size_t num_pages,
+ unsigned long start))
{
- struct tee_shm *shm;
+ unsigned int order = get_order(size);
+ struct page *page;
+ int rc = 0;
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
- p->u.memref.size = mp->u.rmem.size;
- shm = (struct tee_shm *)(unsigned long)mp->u.rmem.shm_ref;
-
- if (shm) {
- p->u.memref.shm_offs = mp->u.rmem.offs;
- p->u.memref.shm = shm;
- } else {
- p->u.memref.shm_offs = 0;
- p->u.memref.shm = NULL;
- }
-}
-
-/**
- * optee_from_msg_param() - convert from OPTEE_MSG parameters to
- * struct tee_param
- * @optee: main service struct
- * @params: subsystem internal parameter representation
- * @num_params: number of elements in the parameter arrays
- * @msg_params: OPTEE_MSG parameters
- * Returns 0 on success or <0 on failure
- */
-static int optee_from_msg_param(struct optee *optee, struct tee_param *params,
- size_t num_params,
- const struct optee_msg_param *msg_params)
-{
- int rc;
- size_t n;
+ page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+ if (!page)
+ return -ENOMEM;
- for (n = 0; n < num_params; n++) {
- struct tee_param *p = params + n;
- const struct optee_msg_param *mp = msg_params + n;
- u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
+ shm->kaddr = page_address(page);
+ shm->paddr = page_to_phys(page);
+ shm->size = PAGE_SIZE << order;
- switch (attr) {
- case OPTEE_MSG_ATTR_TYPE_NONE:
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
- memset(&p->u, 0, sizeof(p->u));
- break;
- case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
- case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
- case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
- from_msg_param_value(p, attr, mp);
- break;
- case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
- case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
- case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
- rc = from_msg_param_tmp_mem(p, attr, mp);
- if (rc)
- return rc;
- break;
- case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
- case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
- case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
- from_msg_param_reg_mem(p, attr, mp);
- break;
+ if (shm_register) {
+ unsigned int nr_pages = 1 << order, i;
+ struct page **pages;
- default:
- return -EINVAL;
+ pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
+ if (!pages) {
+ rc = -ENOMEM;
+ goto err;
}
- }
- return 0;
-}
-
-static void to_msg_param_value(struct optee_msg_param *mp,
- const struct tee_param *p)
-{
- mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
- TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
- mp->u.value.a = p->u.value.a;
- mp->u.value.b = p->u.value.b;
- mp->u.value.c = p->u.value.c;
-}
-
-static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
- const struct tee_param *p)
-{
- int rc;
- phys_addr_t pa;
- mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
- TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
-
- mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
- mp->u.tmem.size = p->u.memref.size;
+ for (i = 0; i < nr_pages; i++) {
+ pages[i] = page;
+ page++;
+ }
- if (!p->u.memref.shm) {
- mp->u.tmem.buf_ptr = 0;
- return 0;
+ shm->flags |= TEE_SHM_REGISTER;
+ rc = shm_register(shm->ctx, shm, pages, nr_pages,
+ (unsigned long)shm->kaddr);
+ kfree(pages);
+ if (rc)
+ goto err;
}
- rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
- if (rc)
- return rc;
-
- mp->u.tmem.buf_ptr = pa;
- mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
- OPTEE_MSG_ATTR_CACHE_SHIFT;
-
- return 0;
-}
-
-static int to_msg_param_reg_mem(struct optee_msg_param *mp,
- const struct tee_param *p)
-{
- mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
- TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
-
- mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
- mp->u.rmem.size = p->u.memref.size;
- mp->u.rmem.offs = p->u.memref.shm_offs;
- return 0;
-}
-
-/**
- * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
- * @optee: main service struct
- * @msg_params: OPTEE_MSG parameters
- * @num_params: number of elements in the parameter arrays
- * @params: subsystem itnernal parameter representation
- * Returns 0 on success or <0 on failure
- */
-static int optee_to_msg_param(struct optee *optee,
- struct optee_msg_param *msg_params,
- size_t num_params, const struct tee_param *params)
-{
- int rc;
- size_t n;
-
- for (n = 0; n < num_params; n++) {
- const struct tee_param *p = params + n;
- struct optee_msg_param *mp = msg_params + n;
-
- switch (p->attr) {
- case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
- mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
- memset(&mp->u, 0, sizeof(mp->u));
- break;
- case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
- case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
- case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
- to_msg_param_value(mp, p);
- break;
- case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
- case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
- case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
- if (tee_shm_is_registered(p->u.memref.shm))
- rc = to_msg_param_reg_mem(mp, p);
- else
- rc = to_msg_param_tmp_mem(mp, p);
- if (rc)
- return rc;
- break;
- default:
- return -EINVAL;
- }
- }
return 0;
-}
-static void optee_get_version(struct tee_device *teedev,
- struct tee_ioctl_version_data *vers)
-{
- struct tee_ioctl_version_data v = {
- .impl_id = TEE_IMPL_ID_OPTEE,
- .impl_caps = TEE_OPTEE_CAP_TZ,
- .gen_caps = TEE_GEN_CAP_GP,
- };
- struct optee *optee = tee_get_drvdata(teedev);
-
- if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
- v.gen_caps |= TEE_GEN_CAP_REG_MEM;
- if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
- v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
- *vers = v;
+err:
+ __free_pages(page, order);
+ return rc;
}
static void optee_bus_scan(struct work_struct *work)
@@ -262,7 +73,7 @@ static void optee_bus_scan(struct work_struct *work)
WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
}
-static int optee_open(struct tee_context *ctx)
+int optee_open(struct tee_context *ctx, bool cap_memref_null)
{
struct optee_context_data *ctxdata;
struct tee_device *teedev = ctx->teedev;
@@ -300,11 +111,7 @@ static int optee_open(struct tee_context *ctx)
mutex_init(&ctxdata->mutex);
INIT_LIST_HEAD(&ctxdata->sess_list);
- if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
- ctx->cap_memref_null = true;
- else
- ctx->cap_memref_null = false;
-
+ ctx->cap_memref_null = cap_memref_null;
ctx->data = ctxdata;
return 0;
}
@@ -330,12 +137,12 @@ static void optee_release_helper(struct tee_context *ctx,
ctx->data = NULL;
}
-static void optee_release(struct tee_context *ctx)
+void optee_release(struct tee_context *ctx)
{
optee_release_helper(ctx, optee_close_session_helper);
}
-static void optee_release_supp(struct tee_context *ctx)
+void optee_release_supp(struct tee_context *ctx)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
@@ -347,287 +154,11 @@ static void optee_release_supp(struct tee_context *ctx)
optee_supp_release(&optee->supp);
}
-static const struct tee_driver_ops optee_clnt_ops = {
- .get_version = optee_get_version,
- .open = optee_open,
- .release = optee_release,
- .open_session = optee_open_session,
- .close_session = optee_close_session,
- .invoke_func = optee_invoke_func,
- .cancel_req = optee_cancel_req,
- .shm_register = optee_shm_register,
- .shm_unregister = optee_shm_unregister,
-};
-
-static const struct tee_desc optee_clnt_desc = {
- .name = DRIVER_NAME "-clnt",
- .ops = &optee_clnt_ops,
- .owner = THIS_MODULE,
-};
-
-static const struct tee_driver_ops optee_supp_ops = {
- .get_version = optee_get_version,
- .open = optee_open,
- .release = optee_release_supp,
- .supp_recv = optee_supp_recv,
- .supp_send = optee_supp_send,
- .shm_register = optee_shm_register_supp,
- .shm_unregister = optee_shm_unregister_supp,
-};
-
-static const struct tee_desc optee_supp_desc = {
- .name = DRIVER_NAME "-supp",
- .ops = &optee_supp_ops,
- .owner = THIS_MODULE,
- .flags = TEE_DESC_PRIVILEGED,
-};
-
-static const struct optee_ops optee_ops = {
- .do_call_with_arg = optee_do_call_with_arg,
- .to_msg_param = optee_to_msg_param,
- .from_msg_param = optee_from_msg_param,
-};
-
-static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
-{
- struct arm_smccc_res res;
-
- invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
-
- if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
- res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
- return true;
- return false;
-}
-
-static void optee_msg_get_os_revision(optee_invoke_fn *invoke_fn)
-{
- union {
- struct arm_smccc_res smccc;
- struct optee_smc_call_get_os_revision_result result;
- } res = {
- .result = {
- .build_id = 0
- }
- };
-
- invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
- &res.smccc);
-
- if (res.result.build_id)
- pr_info("revision %lu.%lu (%08lx)", res.result.major,
- res.result.minor, res.result.build_id);
- else
- pr_info("revision %lu.%lu", res.result.major, res.result.minor);
-}
-
-static bool optee_msg_api_revision_is_compatible(optee_invoke_fn *invoke_fn)
-{
- union {
- struct arm_smccc_res smccc;
- struct optee_smc_calls_revision_result result;
- } res;
-
- invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
-
- if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
- (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
- return true;
- return false;
-}
-
-static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
- u32 *sec_caps)
-{
- union {
- struct arm_smccc_res smccc;
- struct optee_smc_exchange_capabilities_result result;
- } res;
- u32 a1 = 0;
-
- /*
- * TODO This isn't enough to tell if it's UP system (from kernel
- * point of view) or not, is_smp() returns the the information
- * needed, but can't be called directly from here.
- */
- if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
- a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
-
- invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 0, 0, 0, 0, 0, 0,
- &res.smccc);
-
- if (res.result.status != OPTEE_SMC_RETURN_OK)
- return false;
-
- *sec_caps = res.result.capabilities;
- return true;
-}
-
-static struct tee_shm_pool *optee_config_dyn_shm(void)
-{
- struct tee_shm_pool_mgr *priv_mgr;
- struct tee_shm_pool_mgr *dmabuf_mgr;
- void *rc;
-
- rc = optee_shm_pool_alloc_pages();
- if (IS_ERR(rc))
- return rc;
- priv_mgr = rc;
-
- rc = optee_shm_pool_alloc_pages();
- if (IS_ERR(rc)) {
- tee_shm_pool_mgr_destroy(priv_mgr);
- return rc;
- }
- dmabuf_mgr = rc;
-
- rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
- if (IS_ERR(rc)) {
- tee_shm_pool_mgr_destroy(priv_mgr);
- tee_shm_pool_mgr_destroy(dmabuf_mgr);
- }
-
- return rc;
-}
-
-static struct tee_shm_pool *
-optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
+void optee_remove_common(struct optee *optee)
{
- union {
- struct arm_smccc_res smccc;
- struct optee_smc_get_shm_config_result result;
- } res;
- unsigned long vaddr;
- phys_addr_t paddr;
- size_t size;
- phys_addr_t begin;
- phys_addr_t end;
- void *va;
- struct tee_shm_pool_mgr *priv_mgr;
- struct tee_shm_pool_mgr *dmabuf_mgr;
- void *rc;
- const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
-
- invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
- if (res.result.status != OPTEE_SMC_RETURN_OK) {
- pr_err("static shm service not available\n");
- return ERR_PTR(-ENOENT);
- }
-
- if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
- pr_err("only normal cached shared memory supported\n");
- return ERR_PTR(-EINVAL);
- }
-
- begin = roundup(res.result.start, PAGE_SIZE);
- end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
- paddr = begin;
- size = end - begin;
-
- if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
- pr_err("too small shared memory area\n");
- return ERR_PTR(-EINVAL);
- }
-
- va = memremap(paddr, size, MEMREMAP_WB);
- if (!va) {
- pr_err("shared memory ioremap failed\n");
- return ERR_PTR(-EINVAL);
- }
- vaddr = (unsigned long)va;
-
- rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
- 3 /* 8 bytes aligned */);
- if (IS_ERR(rc))
- goto err_memunmap;
- priv_mgr = rc;
-
- vaddr += sz;
- paddr += sz;
- size -= sz;
-
- rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
- if (IS_ERR(rc))
- goto err_free_priv_mgr;
- dmabuf_mgr = rc;
-
- rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
- if (IS_ERR(rc))
- goto err_free_dmabuf_mgr;
-
- *memremaped_shm = va;
-
- return rc;
-
-err_free_dmabuf_mgr:
- tee_shm_pool_mgr_destroy(dmabuf_mgr);
-err_free_priv_mgr:
- tee_shm_pool_mgr_destroy(priv_mgr);
-err_memunmap:
- memunmap(va);
- return rc;
-}
-
-/* Simple wrapper functions to be able to use a function pointer */
-static void optee_smccc_smc(unsigned long a0, unsigned long a1,
- unsigned long a2, unsigned long a3,
- unsigned long a4, unsigned long a5,
- unsigned long a6, unsigned long a7,
- struct arm_smccc_res *res)
-{
- arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
-}
-
-static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
- unsigned long a2, unsigned long a3,
- unsigned long a4, unsigned long a5,
- unsigned long a6, unsigned long a7,
- struct arm_smccc_res *res)
-{
- arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
-}
-
-static optee_invoke_fn *get_invoke_func(struct device *dev)
-{
- const char *method;
-
- pr_info("probing for conduit method.\n");
-
- if (device_property_read_string(dev, "method", &method)) {
- pr_warn("missing \"method\" property\n");
- return ERR_PTR(-ENXIO);
- }
-
- if (!strcmp("hvc", method))
- return optee_smccc_hvc;
- else if (!strcmp("smc", method))
- return optee_smccc_smc;
-
- pr_warn("invalid \"method\" property: %s\n", method);
- return ERR_PTR(-EINVAL);
-}
-
-/* optee_remove - Device Removal Routine
- * @pdev: platform device information struct
- *
- * optee_remove is called by platform subsystem to alert the driver
- * that it should release the device
- */
-
-static int optee_remove(struct platform_device *pdev)
-{
- struct optee *optee = platform_get_drvdata(pdev);
-
/* Unregister OP-TEE specific client devices on TEE bus */
optee_unregister_devices();
- /*
- * Ask OP-TEE to free all cached shared memory objects to decrease
- * reference counters and also avoid wild pointers in secure world
- * into the old shared memory range.
- */
- optee_disable_shm_cache(optee);
-
/*
* The two devices have to be unregistered before we can free the
* other resources.
@@ -636,39 +167,13 @@ static int optee_remove(struct platform_device *pdev)
tee_device_unregister(optee->teedev);
tee_shm_pool_free(optee->pool);
- if (optee->memremaped_shm)
- memunmap(optee->memremaped_shm);
optee_wait_queue_exit(&optee->wait_queue);
optee_supp_uninit(&optee->supp);
mutex_destroy(&optee->call_queue.mutex);
-
- kfree(optee);
-
- return 0;
-}
-
-/* optee_shutdown - Device Removal Routine
- * @pdev: platform device information struct
- *
- * platform_shutdown is called by the platform subsystem to alert
- * the driver that a shutdown, reboot, or kexec is happening and
- * device must be disabled.
- */
-static void optee_shutdown(struct platform_device *pdev)
-{
- optee_disable_shm_cache(platform_get_drvdata(pdev));
}
-static int optee_probe(struct platform_device *pdev)
+static int optee_core_init(void)
{
- optee_invoke_fn *invoke_fn;
- struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
- struct optee *optee = NULL;
- void *memremaped_shm = NULL;
- struct tee_device *teedev;
- u32 sec_caps;
- int rc;
-
/*
* The kernel may have crashed at the same time that all available
* secure world threads were suspended and we cannot reschedule the
@@ -679,139 +184,15 @@ static int optee_probe(struct platform_device *pdev)
if (is_kdump_kernel())
return -ENODEV;
- invoke_fn = get_invoke_func(&pdev->dev);
- if (IS_ERR(invoke_fn))
- return PTR_ERR(invoke_fn);
-
- if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
- pr_warn("api uid mismatch\n");
- return -EINVAL;
- }
-
- optee_msg_get_os_revision(invoke_fn);
-
- if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
- pr_warn("api revision mismatch\n");
- return -EINVAL;
- }
-
- if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
- pr_warn("capabilities mismatch\n");
- return -EINVAL;
- }
-
- /*
- * Try to use dynamic shared memory if possible
- */
- if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
- pool = optee_config_dyn_shm();
-
- /*
- * If dynamic shared memory is not available or failed - try static one
- */
- if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
- pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
-
- if (IS_ERR(pool))
- return PTR_ERR(pool);
-
- optee = kzalloc(sizeof(*optee), GFP_KERNEL);
- if (!optee) {
- rc = -ENOMEM;
- goto err;
- }
-
- optee->ops = &optee_ops;
- optee->invoke_fn = invoke_fn;
- optee->sec_caps = sec_caps;
-
- teedev = tee_device_alloc(&optee_clnt_desc, NULL, pool, optee);
- if (IS_ERR(teedev)) {
- rc = PTR_ERR(teedev);
- goto err;
- }
- optee->teedev = teedev;
-
- teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
- if (IS_ERR(teedev)) {
- rc = PTR_ERR(teedev);
- goto err;
- }
- optee->supp_teedev = teedev;
-
- rc = tee_device_register(optee->teedev);
- if (rc)
- goto err;
-
- rc = tee_device_register(optee->supp_teedev);
- if (rc)
- goto err;
-
- mutex_init(&optee->call_queue.mutex);
- INIT_LIST_HEAD(&optee->call_queue.waiters);
- optee_wait_queue_init(&optee->wait_queue);
- optee_supp_init(&optee->supp);
- optee->memremaped_shm = memremaped_shm;
- optee->pool = pool;
-
- /*
- * Ensure that there are no pre-existing shm objects before enabling
- * the shm cache so that there's no chance of receiving an invalid
- * address during shutdown. This could occur, for example, if we're
- * kexec booting from an older kernel that did not properly cleanup the
- * shm cache.
- */
- optee_disable_unmapped_shm_cache(optee);
-
- optee_enable_shm_cache(optee);
-
- if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
- pr_info("dynamic shared memory is enabled\n");
-
- platform_set_drvdata(pdev, optee);
-
- rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
- if (rc) {
- optee_remove(pdev);
- return rc;
- }
-
- pr_info("initialized driver\n");
- return 0;
-err:
- if (optee) {
- /*
- * tee_device_unregister() is safe to call even if the
- * devices hasn't been registered with
- * tee_device_register() yet.
- */
- tee_device_unregister(optee->supp_teedev);
- tee_device_unregister(optee->teedev);
- kfree(optee);
- }
- if (pool)
- tee_shm_pool_free(pool);
- if (memremaped_shm)
- memunmap(memremaped_shm);
- return rc;
+ return optee_smc_abi_register();
}
+module_init(optee_core_init);
-static const struct of_device_id optee_dt_match[] = {
- { .compatible = "linaro,optee-tz" },
- {},
-};
-MODULE_DEVICE_TABLE(of, optee_dt_match);
-
-static struct platform_driver optee_driver = {
- .probe = optee_probe,
- .remove = optee_remove,
- .shutdown = optee_shutdown,
- .driver = {
- .name = "optee",
- .of_match_table = optee_dt_match,
- },
-};
-module_platform_driver(optee_driver);
+static void optee_core_exit(void)
+{
+ optee_smc_abi_unregister();
+}
+module_exit(optee_core_exit);
MODULE_AUTHOR("Linaro");
MODULE_DESCRIPTION("OP-TEE driver");
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index beca97017996..40af6b059b20 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -12,6 +12,8 @@
#include <linux/types.h>
#include "optee_msg.h"
+#define DRIVER_NAME "optee"
+
#define OPTEE_MAX_ARG_SIZE 1024
/* Some Global Platform error codes used in this driver */
@@ -29,6 +31,11 @@ typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long,
struct arm_smccc_res *);
+struct optee_call_waiter {
+ struct list_head list_node;
+ struct completion c;
+};
+
struct optee_call_queue {
/* Serializes access to this struct */
struct mutex mutex;
@@ -66,6 +73,19 @@ struct optee_supp {
struct completion reqs_c;
};
+/**
+ * struct optee_smc - SMC ABI specifics
+ * @invoke_fn: function to issue smc or hvc
+ * @memremaped_shm virtual address of memory in shared memory pool
+ * @sec_caps: secure world capabilities defined by
+ * OPTEE_SMC_SEC_CAP_* in optee_smc.h
+ */
+struct optee_smc {
+ optee_invoke_fn *invoke_fn;
+ void *memremaped_shm;
+ u32 sec_caps;
+};
+
struct optee;
/**
@@ -95,15 +115,12 @@ struct optee_ops {
* @ops: internal callbacks for different ways to reach secure
* world
* @teedev: client device
- * @invoke_fn: function to issue smc or hvc
+ * @smc: specific to SMC ABI
* @call_queue: queue of threads waiting to call @invoke_fn
* @wait_queue: queue of threads from secure world waiting for a
* secure world sync object
* @supp: supplicant synchronization struct for RPC to supplicant
* @pool: shared memory pool
- * @memremaped_shm virtual address of memory in shared memory pool
- * @sec_caps: secure world capabilities defined by
- * OPTEE_SMC_SEC_CAP_* in optee_smc.h
* @scan_bus_done flag if device registation was already done.
* @scan_bus_wq workqueue to scan optee bus and register optee drivers
* @scan_bus_work workq to scan optee bus and register optee drivers
@@ -112,13 +129,11 @@ struct optee {
struct tee_device *supp_teedev;
struct tee_device *teedev;
const struct optee_ops *ops;
- optee_invoke_fn *invoke_fn;
+ struct optee_smc smc;
struct optee_call_queue call_queue;
struct optee_wait_queue wait_queue;
struct optee_supp supp;
struct tee_shm_pool *pool;
- void *memremaped_shm;
- u32 sec_caps;
bool scan_bus_done;
struct workqueue_struct *scan_bus_wq;
struct work_struct scan_bus_work;
@@ -153,10 +168,6 @@ struct optee_call_ctx {
size_t num_entries;
};
-void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
- struct optee_call_ctx *call_ctx);
-void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx);
-
void optee_wait_queue_init(struct optee_wait_queue *wq);
void optee_wait_queue_exit(struct optee_wait_queue *wq);
@@ -174,7 +185,6 @@ int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
struct tee_param *param);
-int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg);
int optee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param);
@@ -184,30 +194,60 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
struct tee_param *param);
int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
-void optee_enable_shm_cache(struct optee *optee);
-void optee_disable_shm_cache(struct optee *optee);
-void optee_disable_unmapped_shm_cache(struct optee *optee);
-
-int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
- struct page **pages, size_t num_pages,
- unsigned long start);
-int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm);
-
-int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
- struct page **pages, size_t num_pages,
- unsigned long start);
-int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm);
-
-u64 *optee_allocate_pages_list(size_t num_entries);
-void optee_free_pages_list(void *array, size_t num_entries);
-void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
- size_t page_offset);
-
#define PTA_CMD_GET_DEVICES 0x0
#define PTA_CMD_GET_DEVICES_SUPP 0x1
int optee_enumerate_devices(u32 func);
void optee_unregister_devices(void);
+int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
+ struct tee_shm *shm, size_t size,
+ int (*shm_register)(struct tee_context *ctx,
+ struct tee_shm *shm,
+ struct page **pages,
+ size_t num_pages,
+ unsigned long start));
+
+
+void optee_remove_common(struct optee *optee);
+int optee_open(struct tee_context *ctx, bool cap_memref_null);
+void optee_release(struct tee_context *ctx);
+void optee_release_supp(struct tee_context *ctx);
+
+static inline void optee_from_msg_param_value(struct tee_param *p, u32 attr,
+ const struct optee_msg_param *mp)
+{
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
+ attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
+ p->u.value.a = mp->u.value.a;
+ p->u.value.b = mp->u.value.b;
+ p->u.value.c = mp->u.value.c;
+}
+
+static inline void optee_to_msg_param_value(struct optee_msg_param *mp,
+ const struct tee_param *p)
+{
+ mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
+ TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
+ mp->u.value.a = p->u.value.a;
+ mp->u.value.b = p->u.value.b;
+ mp->u.value.c = p->u.value.c;
+}
+
+void optee_cq_wait_init(struct optee_call_queue *cq,
+ struct optee_call_waiter *w);
+void optee_cq_wait_for_completion(struct optee_call_queue *cq,
+ struct optee_call_waiter *w);
+void optee_cq_wait_final(struct optee_call_queue *cq,
+ struct optee_call_waiter *w);
+int optee_check_mem_type(unsigned long start, size_t num_pages);
+struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
+ struct optee_msg_arg **msg_arg);
+
+struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz);
+void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm);
+void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
+ struct optee_msg_arg *arg);
+
/*
* Small helpers
*/
@@ -223,4 +263,8 @@ static inline void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
*reg1 = val;
}
+/* Registration of the ABIs */
+int optee_smc_abi_register(void);
+void optee_smc_abi_unregister(void);
+
#endif /*OPTEE_PRIVATE_H*/
diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c
index 309258d47790..cd642e340eaf 100644
--- a/drivers/tee/optee/rpc.c
+++ b/drivers/tee/optee/rpc.c
@@ -6,12 +6,10 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/delay.h>
-#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include "optee_private.h"
-#include "optee_smc.h"
#include "optee_rpc_cmd.h"
struct wq_entry {
@@ -266,7 +264,7 @@ static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee,
kfree(params);
}
-static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
+struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
{
u32 ret;
struct tee_param param;
@@ -289,103 +287,7 @@ static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
return shm;
}
-static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
- struct optee_msg_arg *arg,
- struct optee_call_ctx *call_ctx)
-{
- phys_addr_t pa;
- struct tee_shm *shm;
- size_t sz;
- size_t n;
-
- arg->ret_origin = TEEC_ORIGIN_COMMS;
-
- if (!arg->num_params ||
- arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
- arg->ret = TEEC_ERROR_BAD_PARAMETERS;
- return;
- }
-
- for (n = 1; n < arg->num_params; n++) {
- if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
- arg->ret = TEEC_ERROR_BAD_PARAMETERS;
- return;
- }
- }
-
- sz = arg->params[0].u.value.b;
- switch (arg->params[0].u.value.a) {
- case OPTEE_RPC_SHM_TYPE_APPL:
- shm = cmd_alloc_suppl(ctx, sz);
- break;
- case OPTEE_RPC_SHM_TYPE_KERNEL:
- shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED | TEE_SHM_PRIV);
- break;
- default:
- arg->ret = TEEC_ERROR_BAD_PARAMETERS;
- return;
- }
-
- if (IS_ERR(shm)) {
- arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
- return;
- }
-
- if (tee_shm_get_pa(shm, 0, &pa)) {
- arg->ret = TEEC_ERROR_BAD_PARAMETERS;
- goto bad;
- }
-
- sz = tee_shm_get_size(shm);
-
- if (tee_shm_is_registered(shm)) {
- struct page **pages;
- u64 *pages_list;
- size_t page_num;
-
- pages = tee_shm_get_pages(shm, &page_num);
- if (!pages || !page_num) {
- arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
- goto bad;
- }
-
- pages_list = optee_allocate_pages_list(page_num);
- if (!pages_list) {
- arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
- goto bad;
- }
-
- call_ctx->pages_list = pages_list;
- call_ctx->num_entries = page_num;
-
- arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
- OPTEE_MSG_ATTR_NONCONTIG;
- /*
- * In the least bits of u.tmem.buf_ptr we store buffer offset
- * from 4k page, as described in OP-TEE ABI.
- */
- arg->params[0].u.tmem.buf_ptr = virt_to_phys(pages_list) |
- (tee_shm_get_page_offset(shm) &
- (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
- arg->params[0].u.tmem.size = tee_shm_get_size(shm);
- arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
-
- optee_fill_pages_list(pages_list, pages, page_num,
- tee_shm_get_page_offset(shm));
- } else {
- arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
- arg->params[0].u.tmem.buf_ptr = pa;
- arg->params[0].u.tmem.size = sz;
- arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
- }
-
- arg->ret = TEEC_SUCCESS;
- return;
-bad:
- tee_shm_free(shm);
-}
-
-static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
+void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
{
struct tee_param param;
@@ -410,60 +312,9 @@ static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, &param);
}
-static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
- struct optee_msg_arg *arg)
-{
- struct tee_shm *shm;
-
- arg->ret_origin = TEEC_ORIGIN_COMMS;
-
- if (arg->num_params != 1 ||
- arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
- arg->ret = TEEC_ERROR_BAD_PARAMETERS;
- return;
- }
-
- shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
- switch (arg->params[0].u.value.a) {
- case OPTEE_RPC_SHM_TYPE_APPL:
- cmd_free_suppl(ctx, shm);
- break;
- case OPTEE_RPC_SHM_TYPE_KERNEL:
- tee_shm_free(shm);
- break;
- default:
- arg->ret = TEEC_ERROR_BAD_PARAMETERS;
- }
- arg->ret = TEEC_SUCCESS;
-}
-
-static void free_pages_list(struct optee_call_ctx *call_ctx)
-{
- if (call_ctx->pages_list) {
- optee_free_pages_list(call_ctx->pages_list,
- call_ctx->num_entries);
- call_ctx->pages_list = NULL;
- call_ctx->num_entries = 0;
- }
-}
-
-void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx)
-{
- free_pages_list(call_ctx);
-}
-
-static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
- struct tee_shm *shm,
- struct optee_call_ctx *call_ctx)
+void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
+ struct optee_msg_arg *arg)
{
- struct optee_msg_arg *arg;
-
- arg = tee_shm_get_va(shm, 0);
- if (IS_ERR(arg)) {
- pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
- return;
- }
-
switch (arg->cmd) {
case OPTEE_RPC_CMD_GET_TIME:
handle_rpc_func_cmd_get_time(arg);
@@ -474,13 +325,6 @@ static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
case OPTEE_RPC_CMD_SUSPEND:
handle_rpc_func_cmd_wait(arg);
break;
- case OPTEE_RPC_CMD_SHM_ALLOC:
- free_pages_list(call_ctx);
- handle_rpc_func_cmd_shm_alloc(ctx, arg, call_ctx);
- break;
- case OPTEE_RPC_CMD_SHM_FREE:
- handle_rpc_func_cmd_shm_free(ctx, arg);
- break;
case OPTEE_RPC_CMD_I2C_TRANSFER:
handle_rpc_func_cmd_i2c_transfer(ctx, arg);
break;
@@ -489,58 +333,4 @@ static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
}
}
-/**
- * optee_handle_rpc() - handle RPC from secure world
- * @ctx: context doing the RPC
- * @param: value of registers for the RPC
- * @call_ctx: call context. Preserved during one OP-TEE invocation
- *
- * Result of RPC is written back into @param.
- */
-void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
- struct optee_call_ctx *call_ctx)
-{
- struct tee_device *teedev = ctx->teedev;
- struct optee *optee = tee_get_drvdata(teedev);
- struct tee_shm *shm;
- phys_addr_t pa;
-
- switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
- case OPTEE_SMC_RPC_FUNC_ALLOC:
- shm = tee_shm_alloc(ctx, param->a1,
- TEE_SHM_MAPPED | TEE_SHM_PRIV);
- if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
- reg_pair_from_64(&param->a1, &param->a2, pa);
- reg_pair_from_64(&param->a4, &param->a5,
- (unsigned long)shm);
- } else {
- param->a1 = 0;
- param->a2 = 0;
- param->a4 = 0;
- param->a5 = 0;
- }
- break;
- case OPTEE_SMC_RPC_FUNC_FREE:
- shm = reg_pair_to_ptr(param->a1, param->a2);
- tee_shm_free(shm);
- break;
- case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
- /*
- * A foreign interrupt was raised while secure world was
- * executing, since they are handled in Linux a dummy RPC is
- * performed to let Linux take the interrupt through the normal
- * vector.
- */
- break;
- case OPTEE_SMC_RPC_FUNC_CMD:
- shm = reg_pair_to_ptr(param->a1, param->a2);
- handle_rpc_func_cmd(ctx, optee, shm, call_ctx);
- break;
- default:
- pr_warn("Unknown RPC func 0x%x\n",
- (u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
- break;
- }
- param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
-}
diff --git a/drivers/tee/optee/shm_pool.h b/drivers/tee/optee/shm_pool.h
deleted file mode 100644
index 28109d991c4b..000000000000
--- a/drivers/tee/optee/shm_pool.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (c) 2015, Linaro Limited
- * Copyright (c) 2016, EPAM Systems
- */
-
-#ifndef SHM_POOL_H
-#define SHM_POOL_H
-
-#include <linux/tee_drv.h>
-
-struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void);
-
-#endif
diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
new file mode 100644
index 000000000000..9a787fb4f5e5
--- /dev/null
+++ b/drivers/tee/optee/smc_abi.c
@@ -0,0 +1,1361 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015-2021, Linaro Limited
+ * Copyright (c) 2016, EPAM Systems
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/arm-smccc.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/tee_drv.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include "optee_private.h"
+#include "optee_smc.h"
+#include "optee_rpc_cmd.h"
+#define CREATE_TRACE_POINTS
+#include "optee_trace.h"
+
+/*
+ * This file implement the SMC ABI used when communicating with secure world
+ * OP-TEE OS via raw SMCs.
+ * This file is divided into the following sections:
+ * 1. Convert between struct tee_param and struct optee_msg_param
+ * 2. Low level support functions to register shared memory in secure world
+ * 3. Dynamic shared memory pool based on alloc_pages()
+ * 4. Do a normal scheduled call into secure world
+ * 5. Driver initialization.
+ */
+
+#define OPTEE_SHM_NUM_PRIV_PAGES CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
+
+/*
+ * 1. Convert between struct tee_param and struct optee_msg_param
+ *
+ * optee_from_msg_param() and optee_to_msg_param() are the main
+ * functions.
+ */
+
+static int from_msg_param_tmp_mem(struct tee_param *p, u32 attr,
+ const struct optee_msg_param *mp)
+{
+ struct tee_shm *shm;
+ phys_addr_t pa;
+ int rc;
+
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
+ attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
+ p->u.memref.size = mp->u.tmem.size;
+ shm = (struct tee_shm *)(unsigned long)mp->u.tmem.shm_ref;
+ if (!shm) {
+ p->u.memref.shm_offs = 0;
+ p->u.memref.shm = NULL;
+ return 0;
+ }
+
+ rc = tee_shm_get_pa(shm, 0, &pa);
+ if (rc)
+ return rc;
+
+ p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
+ p->u.memref.shm = shm;
+
+ /* Check that the memref is covered by the shm object */
+ if (p->u.memref.size) {
+ size_t o = p->u.memref.shm_offs +
+ p->u.memref.size - 1;
+
+ rc = tee_shm_get_pa(shm, o, NULL);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static void from_msg_param_reg_mem(struct tee_param *p, u32 attr,
+ const struct optee_msg_param *mp)
+{
+ struct tee_shm *shm;
+
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
+ attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
+ p->u.memref.size = mp->u.rmem.size;
+ shm = (struct tee_shm *)(unsigned long)mp->u.rmem.shm_ref;
+
+ if (shm) {
+ p->u.memref.shm_offs = mp->u.rmem.offs;
+ p->u.memref.shm = shm;
+ } else {
+ p->u.memref.shm_offs = 0;
+ p->u.memref.shm = NULL;
+ }
+}
+
+/**
+ * optee_from_msg_param() - convert from OPTEE_MSG parameters to
+ * struct tee_param
+ * @optee: main service struct
+ * @params: subsystem internal parameter representation
+ * @num_params: number of elements in the parameter arrays
+ * @msg_params: OPTEE_MSG parameters
+ * Returns 0 on success or <0 on failure
+ */
+static int optee_from_msg_param(struct optee *optee, struct tee_param *params,
+ size_t num_params,
+ const struct optee_msg_param *msg_params)
+{
+ int rc;
+ size_t n;
+
+ for (n = 0; n < num_params; n++) {
+ struct tee_param *p = params + n;
+ const struct optee_msg_param *mp = msg_params + n;
+ u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
+
+ switch (attr) {
+ case OPTEE_MSG_ATTR_TYPE_NONE:
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
+ memset(&p->u, 0, sizeof(p->u));
+ break;
+ case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
+ case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
+ case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
+ optee_from_msg_param_value(p, attr, mp);
+ break;
+ case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
+ case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
+ case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
+ rc = from_msg_param_tmp_mem(p, attr, mp);
+ if (rc)
+ return rc;
+ break;
+ case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
+ case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
+ case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
+ from_msg_param_reg_mem(p, attr, mp);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
+ const struct tee_param *p)
+{
+ int rc;
+ phys_addr_t pa;
+
+ mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
+ TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
+
+ mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
+ mp->u.tmem.size = p->u.memref.size;
+
+ if (!p->u.memref.shm) {
+ mp->u.tmem.buf_ptr = 0;
+ return 0;
+ }
+
+ rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
+ if (rc)
+ return rc;
+
+ mp->u.tmem.buf_ptr = pa;
+ mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
+ OPTEE_MSG_ATTR_CACHE_SHIFT;
+
+ return 0;
+}
+
+static int to_msg_param_reg_mem(struct optee_msg_param *mp,
+ const struct tee_param *p)
+{
+ mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
+ TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
+
+ mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
+ mp->u.rmem.size = p->u.memref.size;
+ mp->u.rmem.offs = p->u.memref.shm_offs;
+ return 0;
+}
+
+/**
+ * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
+ * @optee: main service struct
+ * @msg_params: OPTEE_MSG parameters
+ * @num_params: number of elements in the parameter arrays
+ * @params: subsystem itnernal parameter representation
+ * Returns 0 on success or <0 on failure
+ */
+static int optee_to_msg_param(struct optee *optee,
+ struct optee_msg_param *msg_params,
+ size_t num_params, const struct tee_param *params)
+{
+ int rc;
+ size_t n;
+
+ for (n = 0; n < num_params; n++) {
+ const struct tee_param *p = params + n;
+ struct optee_msg_param *mp = msg_params + n;
+
+ switch (p->attr) {
+ case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
+ mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
+ memset(&mp->u, 0, sizeof(mp->u));
+ break;
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
+ optee_to_msg_param_value(mp, p);
+ break;
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
+ if (tee_shm_is_registered(p->u.memref.shm))
+ rc = to_msg_param_reg_mem(mp, p);
+ else
+ rc = to_msg_param_tmp_mem(mp, p);
+ if (rc)
+ return rc;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+/*
+ * 2. Low level support functions to register shared memory in secure world
+ *
+ * Functions to enable/disable shared memory caching in secure world, that
+ * is, lazy freeing of previously allocated shared memory. Freeing is
+ * performed when a request has been compled.
+ *
+ * Functions to register and unregister shared memory both for normal
+ * clients and for tee-supplicant.
+ */
+
+/**
+ * optee_enable_shm_cache() - Enables caching of some shared memory allocation
+ * in OP-TEE
+ * @optee: main service struct
+ */
+static void optee_enable_shm_cache(struct optee *optee)
+{
+ struct optee_call_waiter w;
+
+ /* We need to retry until secure world isn't busy. */
+ optee_cq_wait_init(&optee->call_queue, &w);
+ while (true) {
+ struct arm_smccc_res res;
+
+ optee->smc.invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE,
+ 0, 0, 0, 0, 0, 0, 0, &res);
+ if (res.a0 == OPTEE_SMC_RETURN_OK)
+ break;
+ optee_cq_wait_for_completion(&optee->call_queue, &w);
+ }
+ optee_cq_wait_final(&optee->call_queue, &w);
+}
+
+/**
+ * __optee_disable_shm_cache() - Disables caching of some shared memory
+ * allocation in OP-TEE
+ * @optee: main service struct
+ * @is_mapped: true if the cached shared memory addresses were mapped by this
+ * kernel, are safe to dereference, and should be freed
+ */
+static void __optee_disable_shm_cache(struct optee *optee, bool is_mapped)
+{
+ struct optee_call_waiter w;
+
+ /* We need to retry until secure world isn't busy. */
+ optee_cq_wait_init(&optee->call_queue, &w);
+ while (true) {
+ union {
+ struct arm_smccc_res smccc;
+ struct optee_smc_disable_shm_cache_result result;
+ } res;
+
+ optee->smc.invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE,
+ 0, 0, 0, 0, 0, 0, 0, &res.smccc);
+ if (res.result.status == OPTEE_SMC_RETURN_ENOTAVAIL)
+ break; /* All shm's freed */
+ if (res.result.status == OPTEE_SMC_RETURN_OK) {
+ struct tee_shm *shm;
+
+ /*
+ * Shared memory references that were not mapped by
+ * this kernel must be ignored to prevent a crash.
+ */
+ if (!is_mapped)
+ continue;
+
+ shm = reg_pair_to_ptr(res.result.shm_upper32,
+ res.result.shm_lower32);
+ tee_shm_free(shm);
+ } else {
+ optee_cq_wait_for_completion(&optee->call_queue, &w);
+ }
+ }
+ optee_cq_wait_final(&optee->call_queue, &w);
+}
+
+/**
+ * optee_disable_shm_cache() - Disables caching of mapped shared memory
+ * allocations in OP-TEE
+ * @optee: main service struct
+ */
+static void optee_disable_shm_cache(struct optee *optee)
+{
+ return __optee_disable_shm_cache(optee, true);
+}
+
+/**
+ * optee_disable_unmapped_shm_cache() - Disables caching of shared memory
+ * allocations in OP-TEE which are not
+ * currently mapped
+ * @optee: main service struct
+ */
+static void optee_disable_unmapped_shm_cache(struct optee *optee)
+{
+ return __optee_disable_shm_cache(optee, false);
+}
+
+#define PAGELIST_ENTRIES_PER_PAGE \
+ ((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
+
+/*
+ * The final entry in each pagelist page is a pointer to the next
+ * pagelist page.
+ */
+static size_t get_pages_list_size(size_t num_entries)
+{
+ int pages = DIV_ROUND_UP(num_entries, PAGELIST_ENTRIES_PER_PAGE);
+
+ return pages * OPTEE_MSG_NONCONTIG_PAGE_SIZE;
+}
+
+static u64 *optee_allocate_pages_list(size_t num_entries)
+{
+ return alloc_pages_exact(get_pages_list_size(num_entries), GFP_KERNEL);
+}
+
+static void optee_free_pages_list(void *list, size_t num_entries)
+{
+ free_pages_exact(list, get_pages_list_size(num_entries));
+}
+
+/**
+ * optee_fill_pages_list() - write list of user pages to given shared
+ * buffer.
+ *
+ * @dst: page-aligned buffer where list of pages will be stored
+ * @pages: array of pages that represents shared buffer
+ * @num_pages: number of entries in @pages
+ * @page_offset: offset of user buffer from page start
+ *
+ * @dst should be big enough to hold list of user page addresses and
+ * links to the next pages of buffer
+ */
+static void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
+ size_t page_offset)
+{
+ int n = 0;
+ phys_addr_t optee_page;
+ /*
+ * Refer to OPTEE_MSG_ATTR_NONCONTIG description in optee_msg.h
+ * for details.
+ */
+ struct {
+ u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
+ u64 next_page_data;
+ } *pages_data;
+
+ /*
+ * Currently OP-TEE uses 4k page size and it does not looks
+ * like this will change in the future. On other hand, there are
+ * no know ARM architectures with page size < 4k.
+ * Thus the next built assert looks redundant. But the following
+ * code heavily relies on this assumption, so it is better be
+ * safe than sorry.
+ */
+ BUILD_BUG_ON(PAGE_SIZE < OPTEE_MSG_NONCONTIG_PAGE_SIZE);
+
+ pages_data = (void *)dst;
+ /*
+ * If linux page is bigger than 4k, and user buffer offset is
+ * larger than 4k/8k/12k/etc this will skip first 4k pages,
+ * because they bear no value data for OP-TEE.
+ */
+ optee_page = page_to_phys(*pages) +
+ round_down(page_offset, OPTEE_MSG_NONCONTIG_PAGE_SIZE);
+
+ while (true) {
+ pages_data->pages_list[n++] = optee_page;
+
+ if (n == PAGELIST_ENTRIES_PER_PAGE) {
+ pages_data->next_page_data =
+ virt_to_phys(pages_data + 1);
+ pages_data++;
+ n = 0;
+ }
+
+ optee_page += OPTEE_MSG_NONCONTIG_PAGE_SIZE;
+ if (!(optee_page & ~PAGE_MASK)) {
+ if (!--num_pages)
+ break;
+ pages++;
+ optee_page = page_to_phys(*pages);
+ }
+ }
+}
+
+static int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
+ struct page **pages, size_t num_pages,
+ unsigned long start)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ struct optee_msg_arg *msg_arg;
+ struct tee_shm *shm_arg;
+ u64 *pages_list;
+ int rc;
+
+ if (!num_pages)
+ return -EINVAL;
+
+ rc = optee_check_mem_type(start, num_pages);
+ if (rc)
+ return rc;
+
+ pages_list = optee_allocate_pages_list(num_pages);
+ if (!pages_list)
+ return -ENOMEM;
+
+ shm_arg = optee_get_msg_arg(ctx, 1, &msg_arg);
+ if (IS_ERR(shm_arg)) {
+ rc = PTR_ERR(shm_arg);
+ goto out;
+ }
+
+ optee_fill_pages_list(pages_list, pages, num_pages,
+ tee_shm_get_page_offset(shm));
+
+ msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
+ msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
+ OPTEE_MSG_ATTR_NONCONTIG;
+ msg_arg->params->u.tmem.shm_ref = (unsigned long)shm;
+ msg_arg->params->u.tmem.size = tee_shm_get_size(shm);
+ /*
+ * In the least bits of msg_arg->params->u.tmem.buf_ptr we
+ * store buffer offset from 4k page, as described in OP-TEE ABI.
+ */
+ msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) |
+ (tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
+
+ if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
+ msg_arg->ret != TEEC_SUCCESS)
+ rc = -EINVAL;
+
+ tee_shm_free(shm_arg);
+out:
+ optee_free_pages_list(pages_list, num_pages);
+ return rc;
+}
+
+static int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ struct optee_msg_arg *msg_arg;
+ struct tee_shm *shm_arg;
+ int rc = 0;
+
+ shm_arg = optee_get_msg_arg(ctx, 1, &msg_arg);
+ if (IS_ERR(shm_arg))
+ return PTR_ERR(shm_arg);
+
+ msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
+
+ msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
+ msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm;
+
+ if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
+ msg_arg->ret != TEEC_SUCCESS)
+ rc = -EINVAL;
+ tee_shm_free(shm_arg);
+ return rc;
+}
+
+static int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
+ struct page **pages, size_t num_pages,
+ unsigned long start)
+{
+ /*
+ * We don't want to register supplicant memory in OP-TEE.
+ * Instead information about it will be passed in RPC code.
+ */
+ return optee_check_mem_type(start, num_pages);
+}
+
+static int optee_shm_unregister_supp(struct tee_context *ctx,
+ struct tee_shm *shm)
+{
+ return 0;
+}
+
+/*
+ * 3. Dynamic shared memory pool based on alloc_pages()
+ *
+ * Implements an OP-TEE specific shared memory pool which is used
+ * when dynamic shared memory is supported by secure world.
+ *
+ * The main function is optee_shm_pool_alloc_pages().
+ */
+
+static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
+ struct tee_shm *shm, size_t size)
+{
+ /*
+ * Shared memory private to the OP-TEE driver doesn't need
+ * to be registered with OP-TEE.
+ */
+ if (shm->flags & TEE_SHM_PRIV)
+ return optee_pool_op_alloc_helper(poolm, shm, size, NULL);
+
+ return optee_pool_op_alloc_helper(poolm, shm, size, optee_shm_register);
+}
+
+static void pool_op_free(struct tee_shm_pool_mgr *poolm,
+ struct tee_shm *shm)
+{
+ if (!(shm->flags & TEE_SHM_PRIV))
+ optee_shm_unregister(shm->ctx, shm);
+
+ free_pages((unsigned long)shm->kaddr, get_order(shm->size));
+ shm->kaddr = NULL;
+}
+
+static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
+{
+ kfree(poolm);
+}
+
+static const struct tee_shm_pool_mgr_ops pool_ops = {
+ .alloc = pool_op_alloc,
+ .free = pool_op_free,
+ .destroy_poolmgr = pool_op_destroy_poolmgr,
+};
+
+/**
+ * optee_shm_pool_alloc_pages() - create page-based allocator pool
+ *
+ * This pool is used when OP-TEE supports dymanic SHM. In this case
+ * command buffers and such are allocated from kernel's own memory.
+ */
+static struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
+{
+ struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+
+ if (!mgr)
+ return ERR_PTR(-ENOMEM);
+
+ mgr->ops = &pool_ops;
+
+ return mgr;
+}
+
+/*
+ * 4. Do a normal scheduled call into secure world
+ *
+ * The function optee_smc_do_call_with_arg() performs a normal scheduled
+ * call into secure world. During this call may normal world request help
+ * from normal world using RPCs, Remote Procedure Calls. This includes
+ * delivery of non-secure interrupts to for instance allow rescheduling of
+ * the current task.
+ */
+
+static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
+ struct optee_msg_arg *arg)
+{
+ struct tee_shm *shm;
+
+ arg->ret_origin = TEEC_ORIGIN_COMMS;
+
+ if (arg->num_params != 1 ||
+ arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+ return;
+ }
+
+ shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
+ switch (arg->params[0].u.value.a) {
+ case OPTEE_RPC_SHM_TYPE_APPL:
+ optee_rpc_cmd_free_suppl(ctx, shm);
+ break;
+ case OPTEE_RPC_SHM_TYPE_KERNEL:
+ tee_shm_free(shm);
+ break;
+ default:
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+ }
+ arg->ret = TEEC_SUCCESS;
+}
+
+static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
+ struct optee_msg_arg *arg,
+ struct optee_call_ctx *call_ctx)
+{
+ phys_addr_t pa;
+ struct tee_shm *shm;
+ size_t sz;
+ size_t n;
+
+ arg->ret_origin = TEEC_ORIGIN_COMMS;
+
+ if (!arg->num_params ||
+ arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+ return;
+ }
+
+ for (n = 1; n < arg->num_params; n++) {
+ if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+ return;
+ }
+ }
+
+ sz = arg->params[0].u.value.b;
+ switch (arg->params[0].u.value.a) {
+ case OPTEE_RPC_SHM_TYPE_APPL:
+ shm = optee_rpc_cmd_alloc_suppl(ctx, sz);
+ break;
+ case OPTEE_RPC_SHM_TYPE_KERNEL:
+ shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED | TEE_SHM_PRIV);
+ break;
+ default:
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+ return;
+ }
+
+ if (IS_ERR(shm)) {
+ arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
+ return;
+ }
+
+ if (tee_shm_get_pa(shm, 0, &pa)) {
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+ goto bad;
+ }
+
+ sz = tee_shm_get_size(shm);
+
+ if (tee_shm_is_registered(shm)) {
+ struct page **pages;
+ u64 *pages_list;
+ size_t page_num;
+
+ pages = tee_shm_get_pages(shm, &page_num);
+ if (!pages || !page_num) {
+ arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
+ goto bad;
+ }
+
+ pages_list = optee_allocate_pages_list(page_num);
+ if (!pages_list) {
+ arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
+ goto bad;
+ }
+
+ call_ctx->pages_list = pages_list;
+ call_ctx->num_entries = page_num;
+
+ arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
+ OPTEE_MSG_ATTR_NONCONTIG;
+ /*
+ * In the least bits of u.tmem.buf_ptr we store buffer offset
+ * from 4k page, as described in OP-TEE ABI.
+ */
+ arg->params[0].u.tmem.buf_ptr = virt_to_phys(pages_list) |
+ (tee_shm_get_page_offset(shm) &
+ (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
+ arg->params[0].u.tmem.size = tee_shm_get_size(shm);
+ arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
+
+ optee_fill_pages_list(pages_list, pages, page_num,
+ tee_shm_get_page_offset(shm));
+ } else {
+ arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
+ arg->params[0].u.tmem.buf_ptr = pa;
+ arg->params[0].u.tmem.size = sz;
+ arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
+ }
+
+ arg->ret = TEEC_SUCCESS;
+ return;
+bad:
+ tee_shm_free(shm);
+}
+
+static void free_pages_list(struct optee_call_ctx *call_ctx)
+{
+ if (call_ctx->pages_list) {
+ optee_free_pages_list(call_ctx->pages_list,
+ call_ctx->num_entries);
+ call_ctx->pages_list = NULL;
+ call_ctx->num_entries = 0;
+ }
+}
+
+static void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx)
+{
+ free_pages_list(call_ctx);
+}
+
+static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
+ struct tee_shm *shm,
+ struct optee_call_ctx *call_ctx)
+{
+ struct optee_msg_arg *arg;
+
+ arg = tee_shm_get_va(shm, 0);
+ if (IS_ERR(arg)) {
+ pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
+ return;
+ }
+
+ switch (arg->cmd) {
+ case OPTEE_RPC_CMD_SHM_ALLOC:
+ free_pages_list(call_ctx);
+ handle_rpc_func_cmd_shm_alloc(ctx, arg, call_ctx);
+ break;
+ case OPTEE_RPC_CMD_SHM_FREE:
+ handle_rpc_func_cmd_shm_free(ctx, arg);
+ break;
+ default:
+ optee_rpc_cmd(ctx, optee, arg);
+ }
+}
+
+/**
+ * optee_handle_rpc() - handle RPC from secure world
+ * @ctx: context doing the RPC
+ * @param: value of registers for the RPC
+ * @call_ctx: call context. Preserved during one OP-TEE invocation
+ *
+ * Result of RPC is written back into @param.
+ */
+static void optee_handle_rpc(struct tee_context *ctx,
+ struct optee_rpc_param *param,
+ struct optee_call_ctx *call_ctx)
+{
+ struct tee_device *teedev = ctx->teedev;
+ struct optee *optee = tee_get_drvdata(teedev);
+ struct tee_shm *shm;
+ phys_addr_t pa;
+
+ switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
+ case OPTEE_SMC_RPC_FUNC_ALLOC:
+ shm = tee_shm_alloc(ctx, param->a1,
+ TEE_SHM_MAPPED | TEE_SHM_PRIV);
+ if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
+ reg_pair_from_64(&param->a1, &param->a2, pa);
+ reg_pair_from_64(&param->a4, &param->a5,
+ (unsigned long)shm);
+ } else {
+ param->a1 = 0;
+ param->a2 = 0;
+ param->a4 = 0;
+ param->a5 = 0;
+ }
+ break;
+ case OPTEE_SMC_RPC_FUNC_FREE:
+ shm = reg_pair_to_ptr(param->a1, param->a2);
+ tee_shm_free(shm);
+ break;
+ case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
+ /*
+ * A foreign interrupt was raised while secure world was
+ * executing, since they are handled in Linux a dummy RPC is
+ * performed to let Linux take the interrupt through the normal
+ * vector.
+ */
+ break;
+ case OPTEE_SMC_RPC_FUNC_CMD:
+ shm = reg_pair_to_ptr(param->a1, param->a2);
+ handle_rpc_func_cmd(ctx, optee, shm, call_ctx);
+ break;
+ default:
+ pr_warn("Unknown RPC func 0x%x\n",
+ (u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
+ break;
+ }
+
+ param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
+}
+
+/**
+ * optee_smc_do_call_with_arg() - Do an SMC to OP-TEE in secure world
+ * @ctx: calling context
+ * @arg: shared memory holding the message to pass to secure world
+ *
+ * Does and SMC to OP-TEE in secure world and handles eventual resulting
+ * Remote Procedure Calls (RPC) from OP-TEE.
+ *
+ * Returns return code from secure world, 0 is OK
+ */
+static int optee_smc_do_call_with_arg(struct tee_context *ctx,
+ struct tee_shm *arg)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ struct optee_call_waiter w;
+ struct optee_rpc_param param = { };
+ struct optee_call_ctx call_ctx = { };
+ phys_addr_t parg;
+ int rc;
+
+ rc = tee_shm_get_pa(arg, 0, &parg);
+ if (rc)
+ return rc;
+
+ param.a0 = OPTEE_SMC_CALL_WITH_ARG;
+ reg_pair_from_64(&param.a1, &param.a2, parg);
+ /* Initialize waiter */
+ optee_cq_wait_init(&optee->call_queue, &w);
+ while (true) {
+ struct arm_smccc_res res;
+
+ trace_optee_invoke_fn_begin(&param);
+ optee->smc.invoke_fn(param.a0, param.a1, param.a2, param.a3,
+ param.a4, param.a5, param.a6, param.a7,
+ &res);
+ trace_optee_invoke_fn_end(&param, &res);
+
+ if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) {
+ /*
+ * Out of threads in secure world, wait for a thread
+ * become available.
+ */
+ optee_cq_wait_for_completion(&optee->call_queue, &w);
+ } else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
+ cond_resched();
+ param.a0 = res.a0;
+ param.a1 = res.a1;
+ param.a2 = res.a2;
+ param.a3 = res.a3;
+ optee_handle_rpc(ctx, &param, &call_ctx);
+ } else {
+ rc = res.a0;
+ break;
+ }
+ }
+
+ optee_rpc_finalize_call(&call_ctx);
+ /*
+ * We're done with our thread in secure world, if there's any
+ * thread waiters wake up one.
+ */
+ optee_cq_wait_final(&optee->call_queue, &w);
+
+ return rc;
+}
+
+/*
+ * 5. Driver initialization
+ *
+ * During driver inititialization is secure world probed to find out which
+ * features it supports so the driver can be initialized with a matching
+ * configuration. This involves for instance support for dynamic shared
+ * memory instead of a static memory carvout.
+ */
+
+static void optee_get_version(struct tee_device *teedev,
+ struct tee_ioctl_version_data *vers)
+{
+ struct tee_ioctl_version_data v = {
+ .impl_id = TEE_IMPL_ID_OPTEE,
+ .impl_caps = TEE_OPTEE_CAP_TZ,
+ .gen_caps = TEE_GEN_CAP_GP,
+ };
+ struct optee *optee = tee_get_drvdata(teedev);
+
+ if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
+ v.gen_caps |= TEE_GEN_CAP_REG_MEM;
+ if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
+ v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
+ *vers = v;
+}
+
+static int optee_smc_open(struct tee_context *ctx)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ u32 sec_caps = optee->smc.sec_caps;
+
+ return optee_open(ctx, sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL);
+}
+
+static const struct tee_driver_ops optee_clnt_ops = {
+ .get_version = optee_get_version,
+ .open = optee_smc_open,
+ .release = optee_release,
+ .open_session = optee_open_session,
+ .close_session = optee_close_session,
+ .invoke_func = optee_invoke_func,
+ .cancel_req = optee_cancel_req,
+ .shm_register = optee_shm_register,
+ .shm_unregister = optee_shm_unregister,
+};
+
+static const struct tee_desc optee_clnt_desc = {
+ .name = DRIVER_NAME "-clnt",
+ .ops = &optee_clnt_ops,
+ .owner = THIS_MODULE,
+};
+
+static const struct tee_driver_ops optee_supp_ops = {
+ .get_version = optee_get_version,
+ .open = optee_smc_open,
+ .release = optee_release_supp,
+ .supp_recv = optee_supp_recv,
+ .supp_send = optee_supp_send,
+ .shm_register = optee_shm_register_supp,
+ .shm_unregister = optee_shm_unregister_supp,
+};
+
+static const struct tee_desc optee_supp_desc = {
+ .name = DRIVER_NAME "-supp",
+ .ops = &optee_supp_ops,
+ .owner = THIS_MODULE,
+ .flags = TEE_DESC_PRIVILEGED,
+};
+
+static const struct optee_ops optee_ops = {
+ .do_call_with_arg = optee_smc_do_call_with_arg,
+ .to_msg_param = optee_to_msg_param,
+ .from_msg_param = optee_from_msg_param,
+};
+
+static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
+{
+ struct arm_smccc_res res;
+
+ invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
+
+ if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
+ res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
+ return true;
+ return false;
+}
+
+static void optee_msg_get_os_revision(optee_invoke_fn *invoke_fn)
+{
+ union {
+ struct arm_smccc_res smccc;
+ struct optee_smc_call_get_os_revision_result result;
+ } res = {
+ .result = {
+ .build_id = 0
+ }
+ };
+
+ invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
+ &res.smccc);
+
+ if (res.result.build_id)
+ pr_info("revision %lu.%lu (%08lx)", res.result.major,
+ res.result.minor, res.result.build_id);
+ else
+ pr_info("revision %lu.%lu", res.result.major, res.result.minor);
+}
+
+static bool optee_msg_api_revision_is_compatible(optee_invoke_fn *invoke_fn)
+{
+ union {
+ struct arm_smccc_res smccc;
+ struct optee_smc_calls_revision_result result;
+ } res;
+
+ invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
+
+ if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
+ (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
+ return true;
+ return false;
+}
+
+static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
+ u32 *sec_caps)
+{
+ union {
+ struct arm_smccc_res smccc;
+ struct optee_smc_exchange_capabilities_result result;
+ } res;
+ u32 a1 = 0;
+
+ /*
+ * TODO This isn't enough to tell if it's UP system (from kernel
+ * point of view) or not, is_smp() returns the information
+ * needed, but can't be called directly from here.
+ */
+ if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
+ a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
+
+ invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 0, 0, 0, 0, 0, 0,
+ &res.smccc);
+
+ if (res.result.status != OPTEE_SMC_RETURN_OK)
+ return false;
+
+ *sec_caps = res.result.capabilities;
+ return true;
+}
+
+static struct tee_shm_pool *optee_config_dyn_shm(void)
+{
+ struct tee_shm_pool_mgr *priv_mgr;
+ struct tee_shm_pool_mgr *dmabuf_mgr;
+ void *rc;
+
+ rc = optee_shm_pool_alloc_pages();
+ if (IS_ERR(rc))
+ return rc;
+ priv_mgr = rc;
+
+ rc = optee_shm_pool_alloc_pages();
+ if (IS_ERR(rc)) {
+ tee_shm_pool_mgr_destroy(priv_mgr);
+ return rc;
+ }
+ dmabuf_mgr = rc;
+
+ rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
+ if (IS_ERR(rc)) {
+ tee_shm_pool_mgr_destroy(priv_mgr);
+ tee_shm_pool_mgr_destroy(dmabuf_mgr);
+ }
+
+ return rc;
+}
+
+static struct tee_shm_pool *
+optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
+{
+ union {
+ struct arm_smccc_res smccc;
+ struct optee_smc_get_shm_config_result result;
+ } res;
+ unsigned long vaddr;
+ phys_addr_t paddr;
+ size_t size;
+ phys_addr_t begin;
+ phys_addr_t end;
+ void *va;
+ struct tee_shm_pool_mgr *priv_mgr;
+ struct tee_shm_pool_mgr *dmabuf_mgr;
+ void *rc;
+ const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
+
+ invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
+ if (res.result.status != OPTEE_SMC_RETURN_OK) {
+ pr_err("static shm service not available\n");
+ return ERR_PTR(-ENOENT);
+ }
+
+ if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
+ pr_err("only normal cached shared memory supported\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ begin = roundup(res.result.start, PAGE_SIZE);
+ end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
+ paddr = begin;
+ size = end - begin;
+
+ if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
+ pr_err("too small shared memory area\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ va = memremap(paddr, size, MEMREMAP_WB);
+ if (!va) {
+ pr_err("shared memory ioremap failed\n");
+ return ERR_PTR(-EINVAL);
+ }
+ vaddr = (unsigned long)va;
+
+ rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
+ 3 /* 8 bytes aligned */);
+ if (IS_ERR(rc))
+ goto err_memunmap;
+ priv_mgr = rc;
+
+ vaddr += sz;
+ paddr += sz;
+ size -= sz;
+
+ rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
+ if (IS_ERR(rc))
+ goto err_free_priv_mgr;
+ dmabuf_mgr = rc;
+
+ rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
+ if (IS_ERR(rc))
+ goto err_free_dmabuf_mgr;
+
+ *memremaped_shm = va;
+
+ return rc;
+
+err_free_dmabuf_mgr:
+ tee_shm_pool_mgr_destroy(dmabuf_mgr);
+err_free_priv_mgr:
+ tee_shm_pool_mgr_destroy(priv_mgr);
+err_memunmap:
+ memunmap(va);
+ return rc;
+}
+
+/* Simple wrapper functions to be able to use a function pointer */
+static void optee_smccc_smc(unsigned long a0, unsigned long a1,
+ unsigned long a2, unsigned long a3,
+ unsigned long a4, unsigned long a5,
+ unsigned long a6, unsigned long a7,
+ struct arm_smccc_res *res)
+{
+ arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
+}
+
+static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
+ unsigned long a2, unsigned long a3,
+ unsigned long a4, unsigned long a5,
+ unsigned long a6, unsigned long a7,
+ struct arm_smccc_res *res)
+{
+ arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
+}
+
+static optee_invoke_fn *get_invoke_func(struct device *dev)
+{
+ const char *method;
+
+ pr_info("probing for conduit method.\n");
+
+ if (device_property_read_string(dev, "method", &method)) {
+ pr_warn("missing \"method\" property\n");
+ return ERR_PTR(-ENXIO);
+ }
+
+ if (!strcmp("hvc", method))
+ return optee_smccc_hvc;
+ else if (!strcmp("smc", method))
+ return optee_smccc_smc;
+
+ pr_warn("invalid \"method\" property: %s\n", method);
+ return ERR_PTR(-EINVAL);
+}
+
+/* optee_remove - Device Removal Routine
+ * @pdev: platform device information struct
+ *
+ * optee_remove is called by platform subsystem to alert the driver
+ * that it should release the device
+ */
+static int optee_smc_remove(struct platform_device *pdev)
+{
+ struct optee *optee = platform_get_drvdata(pdev);
+
+ /*
+ * Ask OP-TEE to free all cached shared memory objects to decrease
+ * reference counters and also avoid wild pointers in secure world
+ * into the old shared memory range.
+ */
+ optee_disable_shm_cache(optee);
+
+ optee_remove_common(optee);
+
+ if (optee->smc.memremaped_shm)
+ memunmap(optee->smc.memremaped_shm);
+
+ kfree(optee);
+
+ return 0;
+}
+
+/* optee_shutdown - Device Removal Routine
+ * @pdev: platform device information struct
+ *
+ * platform_shutdown is called by the platform subsystem to alert
+ * the driver that a shutdown, reboot, or kexec is happening and
+ * device must be disabled.
+ */
+static void optee_shutdown(struct platform_device *pdev)
+{
+ optee_disable_shm_cache(platform_get_drvdata(pdev));
+}
+
+static int optee_probe(struct platform_device *pdev)
+{
+ optee_invoke_fn *invoke_fn;
+ struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
+ struct optee *optee = NULL;
+ void *memremaped_shm = NULL;
+ struct tee_device *teedev;
+ u32 sec_caps;
+ int rc;
+
+ invoke_fn = get_invoke_func(&pdev->dev);
+ if (IS_ERR(invoke_fn))
+ return PTR_ERR(invoke_fn);
+
+ if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
+ pr_warn("api uid mismatch\n");
+ return -EINVAL;
+ }
+
+ optee_msg_get_os_revision(invoke_fn);
+
+ if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
+ pr_warn("api revision mismatch\n");
+ return -EINVAL;
+ }
+
+ if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
+ pr_warn("capabilities mismatch\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Try to use dynamic shared memory if possible
+ */
+ if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
+ pool = optee_config_dyn_shm();
+
+ /*
+ * If dynamic shared memory is not available or failed - try static one
+ */
+ if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
+ pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
+
+ if (IS_ERR(pool))
+ return PTR_ERR(pool);
+
+ optee = kzalloc(sizeof(*optee), GFP_KERNEL);
+ if (!optee) {
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ optee->ops = &optee_ops;
+ optee->smc.invoke_fn = invoke_fn;
+ optee->smc.sec_caps = sec_caps;
+
+ teedev = tee_device_alloc(&optee_clnt_desc, NULL, pool, optee);
+ if (IS_ERR(teedev)) {
+ rc = PTR_ERR(teedev);
+ goto err;
+ }
+ optee->teedev = teedev;
+
+ teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
+ if (IS_ERR(teedev)) {
+ rc = PTR_ERR(teedev);
+ goto err;
+ }
+ optee->supp_teedev = teedev;
+
+ rc = tee_device_register(optee->teedev);
+ if (rc)
+ goto err;
+
+ rc = tee_device_register(optee->supp_teedev);
+ if (rc)
+ goto err;
+
+ mutex_init(&optee->call_queue.mutex);
+ INIT_LIST_HEAD(&optee->call_queue.waiters);
+ optee_wait_queue_init(&optee->wait_queue);
+ optee_supp_init(&optee->supp);
+ optee->smc.memremaped_shm = memremaped_shm;
+ optee->pool = pool;
+
+ /*
+ * Ensure that there are no pre-existing shm objects before enabling
+ * the shm cache so that there's no chance of receiving an invalid
+ * address during shutdown. This could occur, for example, if we're
+ * kexec booting from an older kernel that did not properly cleanup the
+ * shm cache.
+ */
+ optee_disable_unmapped_shm_cache(optee);
+
+ optee_enable_shm_cache(optee);
+
+ if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
+ pr_info("dynamic shared memory is enabled\n");
+
+ platform_set_drvdata(pdev, optee);
+
+ rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
+ if (rc) {
+ optee_smc_remove(pdev);
+ return rc;
+ }
+
+ pr_info("initialized driver\n");
+ return 0;
+err:
+ if (optee) {
+ /*
+ * tee_device_unregister() is safe to call even if the
+ * devices hasn't been registered with
+ * tee_device_register() yet.
+ */
+ tee_device_unregister(optee->supp_teedev);
+ tee_device_unregister(optee->teedev);
+ kfree(optee);
+ }
+ if (pool)
+ tee_shm_pool_free(pool);
+ if (memremaped_shm)
+ memunmap(memremaped_shm);
+ return rc;
+}
+
+static const struct of_device_id optee_dt_match[] = {
+ { .compatible = "linaro,optee-tz" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, optee_dt_match);
+
+static struct platform_driver optee_driver = {
+ .probe = optee_probe,
+ .remove = optee_smc_remove,
+ .shutdown = optee_shutdown,
+ .driver = {
+ .name = "optee",
+ .of_match_table = optee_dt_match,
+ },
+};
+
+int optee_smc_abi_register(void)
+{
+ return platform_driver_register(&optee_driver);
+}
+
+void optee_smc_abi_unregister(void)
+{
+ platform_driver_unregister(&optee_driver);
+}
--
2.34.1