linux-kernel - [PATCH v9 07/13] firmware: qcom: scm: make qcom_scm_qseecom_app_get

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Message-Id: <20240325100359.17001-8-brgl@bgdev.pl>
Date: Mon, 25 Mar 2024 11:03:53 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Andy Gross <agross@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Elliot Berman <quic_eberman@...cinc.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Guru Das Srinagesh <quic_gurus@...cinc.com>,
	Andrew Halaney <ahalaney@...hat.com>,
	Maximilian Luz <luzmaximilian@...il.com>,
	Alex Elder <elder@...aro.org>,
	Srini Kandagatla <srinivas.kandagatla@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Cc: linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kernel@...cinc.com,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Deepti Jaggi <quic_djaggi@...cinc.com>
Subject: [PATCH v9 07/13] firmware: qcom: scm: make qcom_scm_qseecom_app_get_id() use the TZ allocator

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.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@...aro.org>
Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
Tested-by: Maximilian Luz <luzmaximilian@...il.com>
Tested-by: Andrew Halaney <ahalaney@...hat.com> # sc8280xp-lenovo-thinkpad-x13s
Tested-by: Deepti Jaggi <quic_djaggi@...cinc.com> #sa8775p-ride
Reviewed-by: Elliot Berman <quic_eberman@...cinc.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 feb44cc03d2c..d9b189632e61 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -1528,37 +1528,27 @@ 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;
-- 
2.40.1