linux-kernel - [PATCH v2 06/11] firmware: qcom: scm: make qcom_scm_pas_init

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Message-Id: <20230928092040.9420-7-brgl@bgdev.pl>
Date:   Thu, 28 Sep 2023 11:20:35 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        kernel@...cinc.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v2 06/11] firmware: qcom: scm: make qcom_scm_pas_init_image() use the SCM allocator

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

Let's use the new SCM memory allocator to obtain a buffer for this call
instead of using dma_alloc_coherent().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/firmware/qcom/qcom_scm.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 02a773ba1383..c0eb81069847 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -532,7 +532,7 @@ static void qcom_scm_set_download_mode(bool enable)
 int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size,
 			    struct qcom_scm_pas_metadata *ctx)
 {
-	dma_addr_t mdata_phys;
+	phys_addr_t mdata_phys;
 	void *mdata_buf;
 	int ret;
 	struct qcom_scm_desc desc = {
@@ -544,13 +544,7 @@ int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size,
 	};
 	struct qcom_scm_res res;
 
-	/*
-	 * During the scm call memory protection will be enabled for the meta
-	 * data blob, so make sure it's physically contiguous, 4K aligned and
-	 * non-cachable to avoid XPU violations.
-	 */
-	mdata_buf = dma_alloc_coherent(__scm->dev, size, &mdata_phys,
-				       GFP_KERNEL);
+	mdata_buf = qcom_scm_mem_alloc(size, GFP_KERNEL);
 	if (!mdata_buf) {
 		dev_err(__scm->dev, "Allocation of metadata buffer failed.\n");
 		return -ENOMEM;
@@ -574,10 +568,10 @@ int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size,
 
 out:
 	if (ret < 0 || !ctx) {
-		dma_free_coherent(__scm->dev, size, mdata_buf, mdata_phys);
+		qcom_scm_mem_free(mdata_buf);
 	} else if (ctx) {
 		ctx->ptr = mdata_buf;
-		ctx->phys = mdata_phys;
+		ctx->phys = qcom_scm_mem_to_phys(mdata_buf);
 		ctx->size = size;
 	}
 
@@ -594,7 +588,7 @@ void qcom_scm_pas_metadata_release(struct qcom_scm_pas_metadata *ctx)
 	if (!ctx->ptr)
 		return;
 
-	dma_free_coherent(__scm->dev, ctx->size, ctx->ptr, ctx->phys);
+	qcom_scm_mem_free(ctx->ptr);
 
 	ctx->ptr = NULL;
 	ctx->phys = 0;
-- 
2.39.2