[PATCH v4 10/15] firmware: qcom: scm: make qcom_scm_qseecom_app_get_id() use the TZ allocator

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Let's use the new TZ memory allocator to obtain a buffer for this call
instead of manually kmalloc()ing it and then mapping to physical space.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Tested-by: Maximilian Luz <luzmaximilian@gmail.com>
---
 drivers/firmware/qcom/qcom_scm.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 11638daa2fe5..3a6cefb4eb2e 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -1525,37 +1525,27 @@ int qcom_scm_qseecom_app_get_id(const char *app_name, u32 *app_id)
 	unsigned long app_name_len = strlen(app_name);
 	struct qcom_scm_desc desc = {};
 	struct qcom_scm_qseecom_resp res = {};
-	dma_addr_t name_buf_phys;
-	char *name_buf;
 	int status;
 
 	if (app_name_len >= name_buf_size)
 		return -EINVAL;
 
-	name_buf = kzalloc(name_buf_size, GFP_KERNEL);
+	char *name_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool,
+							     name_buf_size,
+							     GFP_KERNEL);
 	if (!name_buf)
 		return -ENOMEM;
 
 	memcpy(name_buf, app_name, app_name_len);
 
-	name_buf_phys = dma_map_single(__scm->dev, name_buf, name_buf_size, DMA_TO_DEVICE);
-	status = dma_mapping_error(__scm->dev, name_buf_phys);
-	if (status) {
-		kfree(name_buf);
-		dev_err(__scm->dev, "qseecom: failed to map dma address\n");
-		return status;
-	}
-
 	desc.owner = QSEECOM_TZ_OWNER_QSEE_OS;
 	desc.svc = QSEECOM_TZ_SVC_APP_MGR;
 	desc.cmd = QSEECOM_TZ_CMD_APP_LOOKUP;
 	desc.arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_RW, QCOM_SCM_VAL);
-	desc.args[0] = name_buf_phys;
+	desc.args[0] = qcom_tzmem_to_phys(name_buf);
 	desc.args[1] = app_name_len;
 
 	status = qcom_scm_qseecom_call(&desc, &res);
-	dma_unmap_single(__scm->dev, name_buf_phys, name_buf_size, DMA_TO_DEVICE);
-	kfree(name_buf);
 
 	if (status)
 		return status;
-- 
2.39.2