tee: optee: Fix dynamic shm pool allocations

In case of dynamic shared memory pool, kernel memory allocated using
dmabuf_mgr pool needs to be registered with OP-TEE prior to its usage
during optee_open_session() or optee_invoke_func().

So fix dmabuf_mgr pool allocations via an additional call to
optee_shm_register().

Also, allow kernel pages to be registered as shared memory with OP-TEE.

Fixes: 9733b072a12a ("optee: allow to work without static shared memory")
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index 13b0269..cf2367b 100644 (file)
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -554,6 +554,13 @@ static int check_mem_type(unsigned long start, size_t num_pages)
        struct mm_struct *mm = current->mm;
        int rc;
 
+       /*
+        * Allow kernel address to register with OP-TEE as kernel
+        * pages are configured as normal memory only.
+        */
+       if (virt_addr_valid(start))
+               return 0;
+
        down_read(&mm->mmap_sem);
        rc = __check_mem_type(find_vma(mm, start),
                              start + num_pages * PAGE_SIZE);

diff --git a/drivers/tee/optee/shm_pool.c b/drivers/tee/optee/shm_pool.c
index de1d9b8..0332a53 100644 (file)
--- a/drivers/tee/optee/shm_pool.c
+++ b/drivers/tee/optee/shm_pool.c
@@ -17,6 +17,7 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
 {
        unsigned int order = get_order(size);
        struct page *page;
+       int rc = 0;
 
        page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
        if (!page)
@@ -26,12 +27,21 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
        shm->paddr = page_to_phys(page);
        shm->size = PAGE_SIZE << order;
 
-       return 0;
+       if (shm->flags & TEE_SHM_DMA_BUF) {
+               shm->flags |= TEE_SHM_REGISTER;
+               rc = optee_shm_register(shm->ctx, shm, &page, 1 << order,
+                                       (unsigned long)shm->kaddr);
+       }
+
+       return rc;
 }
 
 static void pool_op_free(struct tee_shm_pool_mgr *poolm,
                         struct tee_shm *shm)
 {
+       if (shm->flags & TEE_SHM_DMA_BUF)
+               optee_shm_unregister(shm->ctx, shm);
+
        free_pages((unsigned long)shm->kaddr, get_order(shm->size));
        shm->kaddr = NULL;
 }