Merge tag 'tee-shm-for-v5.18' of git://git.linaro.org:/people/jens.wi…

…klander/linux-tee into arm/drivers

TEE shared memory cleanup for v5.18

- The TEE shared memory pool based on two pools is replaced with a single
  somewhat more capable pool.
- Replaces tee_shm_alloc() and tee_shm_register() with new functions
  easier to use and maintain.  The TEE subsystem and the TEE drivers are
  updated to use the new functions instead.
- The TEE based Trusted keys routines are updated to use the new
  simplified functions above.
- The OP-TEE based rng driver is updated to use the new simplified
  functions above.
- The TEE_SHM-flags are refactored to better match their usage

* tag 'tee-shm-for-v5.18' of git://git.linaro.org:/people/jens.wiklander/linux-tee:
  tee: refactor TEE_SHM_* flags
  tee: replace tee_shm_register()
  KEYS: trusted: tee: use tee_shm_register_kernel_buf()
  tee: add tee_shm_register_{user,kernel}_buf()
  optee: add optee_pool_op_free_helper()
  tee: replace tee_shm_alloc()
  tee: simplify shm pool handling
  tee: add tee_shm_alloc_user_buf()
  tee: remove unused tee_shm_pool_alloc_res_mem()
  hwrng: optee-rng: use tee_shm_alloc_kernel_buf()
  optee: use driver internal tee_context for some rpc

Link: https://lore.kernel.org/r/20220218184802.GA968155@jade
Signed-off-by: Arnd Bergmann <[email protected]>

drivers/char/hw_random/optee-rng.c

@@ -145,10 +145,10 @@ static int optee_rng_init(struct hwrng *rng)
 	struct optee_rng_private *pvt_data = to_optee_rng_private(rng);
 	struct tee_shm *entropy_shm_pool = NULL;
 
-	entropy_shm_pool = tee_shm_alloc(pvt_data->ctx, MAX_ENTROPY_REQ_SZ,
-					 TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
+	entropy_shm_pool = tee_shm_alloc_kernel_buf(pvt_data->ctx,
+						    MAX_ENTROPY_REQ_SZ);
 	if (IS_ERR(entropy_shm_pool)) {
-		dev_err(pvt_data->dev, "tee_shm_alloc failed\n");
+		dev_err(pvt_data->dev, "tee_shm_alloc_kernel_buf failed\n");
 		return PTR_ERR(entropy_shm_pool);
 	}
 

drivers/tee/amdtee/shm_pool.c

@@ -8,13 +8,17 @@
 #include <linux/psp-sev.h>
 #include "amdtee_private.h"
 
-static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm,
-			 size_t size)
+static int pool_op_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,
+			 size_t size, size_t align)
 {
 	unsigned int order = get_order(size);
 	unsigned long va;
 	int rc;
 
+	/*
+	 * Ignore alignment since this is already going to be page aligned
+	 * and there's no need for any larger alignment.
+	 */
 	va = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
 	if (!va)
 		return -ENOMEM;
@@ -34,60 +38,33 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm,
 	return 0;
 }
 
-static void pool_op_free(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm)
+static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm)
 {
 	/* Unmap the shared memory from TEE */
 	amdtee_unmap_shmem(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)
+static void pool_op_destroy_pool(struct tee_shm_pool *pool)
 {
-	kfree(poolm);
+	kfree(pool);
 }
 
-static const struct tee_shm_pool_mgr_ops pool_ops = {
+static const struct tee_shm_pool_ops pool_ops = {
 	.alloc = pool_op_alloc,
 	.free = pool_op_free,
-	.destroy_poolmgr = pool_op_destroy_poolmgr,
+	.destroy_pool = pool_op_destroy_pool,
 };
 
-static struct tee_shm_pool_mgr *pool_mem_mgr_alloc(void)
-{
-	struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
-
-	if (!mgr)
-		return ERR_PTR(-ENOMEM);
-
-	mgr->ops = &pool_ops;
-
-	return mgr;
-}
-
 struct tee_shm_pool *amdtee_config_shm(void)
 {
-	struct tee_shm_pool_mgr *priv_mgr;
-	struct tee_shm_pool_mgr *dmabuf_mgr;
-	void *rc;
+	struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
 
-	rc = pool_mem_mgr_alloc();
-	if (IS_ERR(rc))
-		return rc;
-	priv_mgr = rc;
-
-	rc = pool_mem_mgr_alloc();
-	if (IS_ERR(rc)) {
-		tee_shm_pool_mgr_destroy(priv_mgr);
-		return rc;
-	}
-	dmabuf_mgr = rc;
+	if (!pool)
+		return ERR_PTR(-ENOMEM);
 
-	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);
-	}
+	pool->ops = &pool_ops;
 
-	return rc;
+	return pool;
 }

drivers/tee/optee/Kconfig

@@ -7,11 +7,3 @@ config OPTEE
 	help
 	  This implements the OP-TEE Trusted Execution Environment (TEE)
 	  driver.
-
-config OPTEE_SHM_NUM_PRIV_PAGES
-	int "Private Shared Memory Pages"
-	default 1
-	depends on OPTEE
-	help
-	  This sets the number of private shared memory pages to be
-	  used by OP-TEE TEE driver.

drivers/tee/optee/call.c

@@ -120,7 +120,7 @@ struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
 	if (optee->rpc_arg_count)
 		sz += OPTEE_MSG_GET_ARG_SIZE(optee->rpc_arg_count);
 
-	shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED | TEE_SHM_PRIV);
+	shm = tee_shm_alloc_priv_buf(ctx, sz);
 	if (IS_ERR(shm))
 		return shm;
 

drivers/tee/optee/core.c

@@ -18,8 +18,8 @@
 #include <linux/workqueue.h>
 #include "optee_private.h"
 
-int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
-			       struct tee_shm *shm, size_t size,
+int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
+			       size_t size, size_t align,
 			       int (*shm_register)(struct tee_context *ctx,
 						   struct tee_shm *shm,
 						   struct page **pages,
@@ -30,6 +30,10 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
 	struct page *page;
 	int rc = 0;
 
+	/*
+	 * Ignore alignment since this is already going to be page aligned
+	 * and there's no need for any larger alignment.
+	 */
 	page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
 	if (!page)
 		return -ENOMEM;
@@ -51,7 +55,6 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
 		for (i = 0; i < nr_pages; i++)
 			pages[i] = page + i;
 
-		shm->flags |= TEE_SHM_REGISTER;
 		rc = shm_register(shm->ctx, shm, pages, nr_pages,
 				  (unsigned long)shm->kaddr);
 		kfree(pages);
@@ -62,10 +65,20 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
 	return 0;
 
 err:
-	__free_pages(page, order);
+	free_pages((unsigned long)shm->kaddr, order);
 	return rc;
 }
 
+void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
+			       int (*shm_unregister)(struct tee_context *ctx,
+						     struct tee_shm *shm))
+{
+	if (shm_unregister)
+		shm_unregister(shm->ctx, shm);
+	free_pages((unsigned long)shm->kaddr, get_order(shm->size));
+	shm->kaddr = NULL;
+}
+
 static void optee_bus_scan(struct work_struct *work)
 {
 	WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
@@ -158,6 +171,7 @@ void optee_remove_common(struct optee *optee)
 	optee_unregister_devices();
 
 	optee_notif_uninit(optee);
+	teedev_close_context(optee->ctx);
 	/*
 	 * The two devices have to be unregistered before we can free the
 	 * other resources.

drivers/tee/optee/device.c

@@ -121,10 +121,9 @@ static int __optee_enumerate_devices(u32 func)
 	if (rc < 0 || !shm_size)
 		goto out_sess;
 
-	device_shm = tee_shm_alloc(ctx, shm_size,
-				   TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
+	device_shm = tee_shm_alloc_kernel_buf(ctx, shm_size);
 	if (IS_ERR(device_shm)) {
-		pr_err("tee_shm_alloc failed\n");
+		pr_err("tee_shm_alloc_kernel_buf failed\n");
 		rc = PTR_ERR(device_shm);
 		goto out_sess;
 	}