1 files changed, 219 insertions, 1 deletions

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index f7b7b404c990..a5afbe6dee68 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/errno.h>
+#include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/tee_drv.h>
 #include <linux/types.h>
@@ -135,6 +136,7 @@ u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
 	struct optee *optee = tee_get_drvdata(ctx->teedev);
 	struct optee_call_waiter w;
 	struct optee_rpc_param param = { };
+	struct optee_call_ctx call_ctx = { };
 	u32 ret;
 
 	param.a0 = OPTEE_SMC_CALL_WITH_ARG;
@@ -159,13 +161,14 @@ u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
 			param.a1 = res.a1;
 			param.a2 = res.a2;
 			param.a3 = res.a3;
-			optee_handle_rpc(ctx, &param);
+			optee_handle_rpc(ctx, &param, &call_ctx);
 		} else {
 			ret = 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.
@@ -442,3 +445,218 @@ void optee_disable_shm_cache(struct optee *optee)
 	}
 	optee_cq_wait_final(&optee->call_queue, &w);
 }
+
+#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)
+	return (pgprot_val(p) & L_PTE_MT_MASK) == L_PTE_MT_WRITEALLOC;
+#elif defined(CONFIG_ARM64)
+	return (pgprot_val(p) & PTE_ATTRINDX_MASK) == PTE_ATTRINDX(MT_NORMAL);
+#else
+#error "Unuspported architecture"
+#endif
+}
+
+static int __check_mem_type(struct vm_area_struct *vma, unsigned long end)
+{
+	while (vma && is_normal_memory(vma->vm_page_prot)) {
+		if (vma->vm_end >= end)
+			return 0;
+		vma = vma->vm_next;
+	}
+
+	return -EINVAL;
+}
+
+static int check_mem_type(unsigned long start, size_t num_pages)
+{
+	struct mm_struct *mm = current->mm;
+	int rc;
+
+	down_read(&mm->mmap_sem);
+	rc = __check_mem_type(find_vma(mm, start),
+			      start + num_pages * PAGE_SIZE);
+	up_read(&mm->mmap_sem);
+
+	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 tee_shm *shm_arg = NULL;
+	struct optee_msg_arg *msg_arg;
+	u64 *pages_list;
+	phys_addr_t msg_parg;
+	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, &msg_parg);
+	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_do_call_with_arg(ctx, msg_parg) ||
+	    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 tee_shm *shm_arg;
+	struct optee_msg_arg *msg_arg;
+	phys_addr_t msg_parg;
+	int rc = 0;
+
+	shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg);
+	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_do_call_with_arg(ctx, msg_parg) ||
+	    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;
+}