linux-kernel - [PATCH v10 12/15] firmware: qcom: scm: add support for SHM bridge memory carveout

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Message-Id: <20240527-shm-bridge-v10-12-ce7afaa58d3a@linaro.org>
Date: Mon, 27 May 2024 14:55:02 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Robert Marko <robimarko@...il.com>, 
 Das Srinagesh <quic_gurus@...cinc.com>, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
 Maximilian Luz <luzmaximilian@...il.com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Srini Kandagatla <srinivas.kandagatla@...aro.org>, 
 Arnd Bergmann <arnd@...db.de>, Elliot Berman <quic_eberman@...cinc.com>, 
 Alex Elder <elder@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 kernel@...cinc.com
Subject: [PATCH v10 12/15] firmware: qcom: scm: add support for SHM bridge
 memory carveout

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

Parse the "memory-region" property and - if present - use it to assign
the dedicated reserved memory to the underlying DMA callbacks which will
then allocate memory for the SCM calls from it.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/firmware/qcom/qcom_scm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 94c34cde8179..c82957727650 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -23,6 +23,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/reset-controller.h>
 #include <linux/sizes.h>
@@ -1942,6 +1943,11 @@ static int qcom_scm_probe(struct platform_device *pdev)
 	if (of_property_read_bool(pdev->dev.of_node, "qcom,sdi-enabled"))
 		qcom_scm_disable_sdi();
 
+	ret = of_reserved_mem_device_init(__scm->dev);
+	if (ret && ret != -ENODEV)
+		return dev_err_probe(__scm->dev, ret,
+				     "Failed to setup the reserved memory region for TZ mem\n");
+
 	ret = qcom_tzmem_enable(__scm->dev);
 	if (ret)
 		return dev_err_probe(__scm->dev, ret,

-- 
2.43.0