1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/tee/optee/shm_pool.c b/drivers/tee/optee/shm_pool.c
new file mode 100644
index 000000000..fa75024f1
--- /dev/null
+++ b/drivers/tee/optee/shm_pool.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2017, EPAM Systems
+ */
+#include <linux/device.h>
+#include <linux/dma-buf.h>
+#include <linux/genalloc.h>
+#include <linux/slab.h>
+#include <linux/tee_drv.h>
+#include "optee_private.h"
+#include "optee_smc.h"
+#include "shm_pool.h"
+
+static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
+			 struct tee_shm *shm, size_t size)
+{
+	unsigned int order = get_order(size);
+	struct page *page;
+	int rc = 0;
+
+	page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+	if (!page)
+		return -ENOMEM;
+
+	shm->kaddr = page_address(page);
+	shm->paddr = page_to_phys(page);
+	shm->size = PAGE_SIZE << order;
+
+	/*
+	 * Shared memory private to the OP-TEE driver doesn't need
+	 * to be registered with OP-TEE.
+	 */
+	if (!(shm->flags & TEE_SHM_PRIV)) {
+		unsigned int nr_pages = 1 << order, i;
+		struct page **pages;
+
+		pages = kcalloc(nr_pages, sizeof(pages), GFP_KERNEL);
+		if (!pages) {
+			rc = -ENOMEM;
+			goto err;
+		}
+
+		for (i = 0; i < nr_pages; i++)
+			pages[i] = page + i;
+
+		shm->flags |= TEE_SHM_REGISTER;
+		rc = optee_shm_register(shm->ctx, shm, pages, nr_pages,
+					(unsigned long)shm->kaddr);
+		kfree(pages);
+		if (rc)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	__free_pages(page, order);
+	return rc;
+}
+
+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.
+ */
+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;
+}