[PATCH v2 0/2] soc: qcom: Add support for Qualcomm Modem Processing SubSystem DSM memory

[PATCH v2 0/2] soc: qcom: Add support for Qualcomm Modem Processing SubSystem DSM memory

[Neil Armstrong]

The Qualcomm SM8550 SoC Modem Processing SubSystem requires that a memory
region named DSM should be shared with the Application Processor SubSystem.

This adds bindings for this MPSS DSM memory and driver implementation to
share this memory region with the Modem Processing SubSystem.

The MPSS DSM memory must be shared between the APPS SubSystem and the MPSS
SubSystems, for the whole lifetime of the system.

To: Andy Gross <agross@kernel.org>
To: Bjorn Andersson <andersson@kernel.org>
To: Konrad Dybcio <konrad.dybcio@somainline.org>
To: Rob Herring <robh+dt@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
To: Frank Rowand <frowand.list@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

---
Changes in v2:
- Fixed the bindings
- Added some precision on the MPSS DSM in commit messages
- Link to v1: https://lore.kernel.org/r/20221114-narmstrong-sm8550-upstream-mpss_dsm-v1-0-158dc2bb6e96@linaro.org

---
Neil Armstrong (2):
      dt-bindings: reserved-memory: document Qualcomm MPSS DSM memory
      soc: qcom: add MDSS DSM memory driver

 .../reserved-memory/qcom,mpss-dsm-mem.yaml         | 37 +++++++++
 drivers/of/platform.c                              |  1 +
 drivers/soc/qcom/Kconfig                           | 10 +++
 drivers/soc/qcom/Makefile                          |  1 +
 drivers/soc/qcom/mpss_dsm_mem.c                    | 95 ++++++++++++++++++++++
 5 files changed, 144 insertions(+)
---
base-commit: 999e0145579c0e04174044a39257a4d96ee30020
change-id: 20221114-narmstrong-sm8550-upstream-mpss_dsm-21c438c65f9b

Best regards,
-- 
Neil Armstrong <neil.armstrong@linaro.org>

[PATCH v2 1/2] dt-bindings: reserved-memory: document Qualcomm MPSS DSM memory

[Neil Armstrong]

Document the Qualcomm Modem Processing SubSystem DSM shared memory.

This memory zone is shared between the APPS and the MPSS subsystem,
and must be configured during the whole lifetime of the system.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
---
 .../reserved-memory/qcom,mpss-dsm-mem.yaml         | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml b/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml
new file mode 100644
index 000000000000..226d0dfc422c
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/qcom,mpss-dsm-mem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Modem Processing SubSystem DSM Memory
+
+description: |
+  Qualcomm Modem Processing SubSystem DSM, which serves the purpose of
+  describing the shared memory region used for MPSS remote processors.
+
+maintainers:
+  - Bjorn Andersson <andersson@kernel.org>
+
+allOf:
+  - $ref: reserved-memory.yaml
+
+properties:
+  compatible:
+    const: qcom,mpss-dsm-mem
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        mpss-dsm@86700000 {
+            compatible = "qcom,mpss-dsm-mem";
+            reg = <0x86700000 0xe0000>;
+            no-map;
+        };
+    };

-- 
b4 0.10.1

[PATCH v2 2/2] soc: qcom: add MDSS DSM memory driver

[Neil Armstrong]

Add a driver for the Qualcomm Modem Processing SubSystem DSM memory
used to assign such regions of memory with remote MPSS processors.

This memory zone is shared between the APPS and the MPSS subsystem,
and must be configured during the whole lifetime of the system.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
---
 drivers/of/platform.c           |  1 +
 drivers/soc/qcom/Kconfig        | 10 +++++
 drivers/soc/qcom/Makefile       |  1 +
 drivers/soc/qcom/mpss_dsm_mem.c | 95 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 107 insertions(+)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 3507095a69f6..d4bb03292f45 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -505,6 +505,7 @@ EXPORT_SYMBOL_GPL(of_platform_default_populate);
 
 static const struct of_device_id reserved_mem_matches[] = {
 	{ .compatible = "phram" },
+	{ .compatible = "qcom,mpss-dsm-mem" },
 	{ .compatible = "qcom,rmtfs-mem" },
 	{ .compatible = "qcom,cmd-db" },
 	{ .compatible = "qcom,smem" },
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 024e420f1bb7..7624a8af56bf 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -95,6 +95,16 @@ config QCOM_QMI_HELPERS
 	tristate
 	depends on NET
 
+config QCOM_MPSS_DSM_MEM
+	tristate "Qualcomm Modem Processing SubSystem DSM memory driver"
+	depends on ARCH_QCOM
+	select QCOM_SCM
+	help
+	  The Qualcomm Modem Processing SubSystem DSM memory driver is used to
+	  assign regions of DSM memory with remote MPSS processors.
+
+	  Say y here if you intend to boot the modem remoteproc.
+
 config QCOM_RMTFS_MEM
 	tristate "Qualcomm Remote Filesystem memory driver"
 	depends on ARCH_QCOM
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index d66604aff2b0..0d0e850f1a18 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -16,6 +16,7 @@ qcom_rpmh-y			+= rpmh-rsc.o
 qcom_rpmh-y			+= rpmh.o
 obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o
 obj-$(CONFIG_QCOM_SMEM) +=	smem.o
+obj-$(CONFIG_QCOM_MPSS_DSM_MEM) += mpss_dsm_mem.o
 obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
 obj-$(CONFIG_QCOM_SMP2P)	+= smp2p.o
 obj-$(CONFIG_QCOM_SMSM)	+= smsm.o
diff --git a/drivers/soc/qcom/mpss_dsm_mem.c b/drivers/soc/qcom/mpss_dsm_mem.c
new file mode 100644
index 000000000000..5584bd101aee
--- /dev/null
+++ b/drivers/soc/qcom/mpss_dsm_mem.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022 Linaro Ltd.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/slab.h>
+#include <linux/qcom_scm.h>
+
+struct qcom_mpss_dsm_mem {
+	phys_addr_t addr;
+	phys_addr_t size;
+
+	unsigned int perms;
+};
+
+static int qcom_mpss_dsm_mem_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct qcom_scm_vmperm perm;
+	struct reserved_mem *rmem;
+	struct qcom_mpss_dsm_mem *mpss_dsm_mem;
+	int ret;
+
+	if (!qcom_scm_is_available())
+		return -EPROBE_DEFER;
+
+	rmem = of_reserved_mem_lookup(node);
+	if (!rmem) {
+		dev_err(&pdev->dev, "failed to acquire memory region\n");
+		return -EINVAL;
+	}
+
+	mpss_dsm_mem = kzalloc(sizeof(*mpss_dsm_mem), GFP_KERNEL);
+	if (!mpss_dsm_mem)
+		return -ENOMEM;
+
+	mpss_dsm_mem->addr = rmem->base;
+	mpss_dsm_mem->size = rmem->size;
+
+	perm.vmid = QCOM_SCM_VMID_MSS_MSA;
+	perm.perm = QCOM_SCM_PERM_RW;
+
+	mpss_dsm_mem->perms = BIT(QCOM_SCM_VMID_HLOS);
+	ret = qcom_scm_assign_mem(mpss_dsm_mem->addr, mpss_dsm_mem->size,
+				  &mpss_dsm_mem->perms, &perm, 1);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "assign memory failed\n");
+		return ret;
+	}
+
+	dev_set_drvdata(&pdev->dev, mpss_dsm_mem);
+
+	return 0;
+}
+
+static int qcom_mpss_dsm_mem_remove(struct platform_device *pdev)
+{
+	struct qcom_mpss_dsm_mem *mpss_dsm_mem = dev_get_drvdata(&pdev->dev);
+	struct qcom_scm_vmperm perm;
+
+	perm.vmid = QCOM_SCM_VMID_HLOS;
+	perm.perm = QCOM_SCM_PERM_RW;
+
+	qcom_scm_assign_mem(mpss_dsm_mem->addr, mpss_dsm_mem->size,
+			    &mpss_dsm_mem->perms, &perm, 1);
+
+	return 0;
+}
+
+static const struct of_device_id qcom_mpss_dsm_mem_of_match[] = {
+	{ .compatible = "qcom,mpss-dsm-mem" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, qcom_mpss_dsm_mem_of_match);
+
+static struct platform_driver qcom_mpss_dsm_mem_driver = {
+	.probe = qcom_mpss_dsm_mem_probe,
+	.remove = qcom_mpss_dsm_mem_remove,
+	.driver  = {
+		.name  = "qcom_mpss_dsm_mem",
+		.of_match_table = qcom_mpss_dsm_mem_of_match,
+	},
+};
+
+module_platform_driver(qcom_mpss_dsm_mem_driver);
+
+MODULE_AUTHOR("Linaro Ltd");
+MODULE_DESCRIPTION("Qualcomm DSM memory driver");
+MODULE_LICENSE("GPL");

-- 
b4 0.10.1

Re: [PATCH v2 1/2] dt-bindings: reserved-memory: document Qualcomm MPSS DSM memory

[Krzysztof Kozlowski]

On 18/11/2022 09:53, Neil Armstrong wrote:
> Document the Qualcomm Modem Processing SubSystem DSM shared memory.
> 
> This memory zone is shared between the APPS and the MPSS subsystem,
> and must be configured during the whole lifetime of the system.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
> ---
>  .../reserved-memory/qcom,mpss-dsm-mem.yaml         | 37 ++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml b/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml
> new file mode 100644
> index 000000000000..226d0dfc422c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml
> @@ -0,0 +1,37 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reserved-memory/qcom,mpss-dsm-mem.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Modem Processing SubSystem DSM Memory
> +

Discussion in v1 is still going. Memory region is not a device.

Best regards,
Krzysztof

Re: [PATCH v2 2/2] soc: qcom: add MDSS DSM memory driver

[Srinivas Kandagatla]

On 18/11/2022 08:53, Neil Armstrong wrote:
> Add a driver for the Qualcomm Modem Processing SubSystem DSM memory
> used to assign such regions of memory with remote MPSS processors.
> 
> This memory zone is shared between the APPS and the MPSS subsystem,
> and must be configured during the whole lifetime of the system.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
> ---
>   drivers/of/platform.c           |  1 +
>   drivers/soc/qcom/Kconfig        | 10 +++++
>   drivers/soc/qcom/Makefile       |  1 +
>   drivers/soc/qcom/mpss_dsm_mem.c | 95 +++++++++++++++++++++++++++++++++++++++++
>   4 files changed, 107 insertions(+)
> 
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index 3507095a69f6..d4bb03292f45 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -505,6 +505,7 @@ EXPORT_SYMBOL_GPL(of_platform_default_populate);
>   
>   static const struct of_device_id reserved_mem_matches[] = {
>   	{ .compatible = "phram" },
> +	{ .compatible = "qcom,mpss-dsm-mem" },
>   	{ .compatible = "qcom,rmtfs-mem" },
>   	{ .compatible = "qcom,cmd-db" },
>   	{ .compatible = "qcom,smem" },
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index 024e420f1bb7..7624a8af56bf 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -95,6 +95,16 @@ config QCOM_QMI_HELPERS
>   	tristate
>   	depends on NET
>   
> +config QCOM_MPSS_DSM_MEM
> +	tristate "Qualcomm Modem Processing SubSystem DSM memory driver"
> +	depends on ARCH_QCOM
> +	select QCOM_SCM
> +	help
> +	  The Qualcomm Modem Processing SubSystem DSM memory driver is used to
> +	  assign regions of DSM memory with remote MPSS processors.
> +
> +	  Say y here if you intend to boot the modem remoteproc.
> +
>   config QCOM_RMTFS_MEM
>   	tristate "Qualcomm Remote Filesystem memory driver"
>   	depends on ARCH_QCOM
> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> index d66604aff2b0..0d0e850f1a18 100644
> --- a/drivers/soc/qcom/Makefile
> +++ b/drivers/soc/qcom/Makefile
> @@ -16,6 +16,7 @@ qcom_rpmh-y			+= rpmh-rsc.o
>   qcom_rpmh-y			+= rpmh.o
>   obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o
>   obj-$(CONFIG_QCOM_SMEM) +=	smem.o
> +obj-$(CONFIG_QCOM_MPSS_DSM_MEM) += mpss_dsm_mem.o
>   obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
>   obj-$(CONFIG_QCOM_SMP2P)	+= smp2p.o
>   obj-$(CONFIG_QCOM_SMSM)	+= smsm.o
> diff --git a/drivers/soc/qcom/mpss_dsm_mem.c b/drivers/soc/qcom/mpss_dsm_mem.c
> new file mode 100644
> index 000000000000..5584bd101aee
> --- /dev/null
> +++ b/drivers/soc/qcom/mpss_dsm_mem.c
> @@ -0,0 +1,95 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022 Linaro Ltd.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/slab.h>
> +#include <linux/qcom_scm.h>
> +
> +struct qcom_mpss_dsm_mem {
> +	phys_addr_t addr;
> +	phys_addr_t size;
> +
> +	unsigned int perms;
> +};
> +
> +static int qcom_mpss_dsm_mem_probe(struct platform_device *pdev)
> +{
> +	struct device_node *node = pdev->dev.of_node;
> +	struct qcom_scm_vmperm perm;
> +	struct reserved_mem *rmem;
> +	struct qcom_mpss_dsm_mem *mpss_dsm_mem;
> +	int ret;
> +
> +	if (!qcom_scm_is_available())
> +		return -EPROBE_DEFER;
> +
> +	rmem = of_reserved_mem_lookup(node);
> +	if (!rmem) {
> +		dev_err(&pdev->dev, "failed to acquire memory region\n");
> +		return -EINVAL;
> +	}
> +
> +	mpss_dsm_mem = kzalloc(sizeof(*mpss_dsm_mem), GFP_KERNEL);
> +	if (!mpss_dsm_mem)
> +		return -ENOMEM;
> +
> +	mpss_dsm_mem->addr = rmem->base;
> +	mpss_dsm_mem->size = rmem->size;
> +
> +	perm.vmid = QCOM_SCM_VMID_MSS_MSA;
> +	perm.perm = QCOM_SCM_PERM_RW;
> +
> +	mpss_dsm_mem->perms = BIT(QCOM_SCM_VMID_HLOS);
> +	ret = qcom_scm_assign_mem(mpss_dsm_mem->addr, mpss_dsm_mem->size,
> +				  &mpss_dsm_mem->perms, &perm, 1);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "assign memory failed\n");

memory leak here?


> +		return ret;
> +	}
> +
> +	dev_set_drvdata(&pdev->dev, mpss_dsm_mem);
> +
> +	return 0;
> +}
> +
> +static int qcom_mpss_dsm_mem_remove(struct platform_device *pdev)
> +{
> +	struct qcom_mpss_dsm_mem *mpss_dsm_mem = dev_get_drvdata(&pdev->dev);
> +	struct qcom_scm_vmperm perm;
> +
> +	perm.vmid = QCOM_SCM_VMID_HLOS;
> +	perm.perm = QCOM_SCM_PERM_RW;
> +
> +	qcom_scm_assign_mem(mpss_dsm_mem->addr, mpss_dsm_mem->size,
> +			    &mpss_dsm_mem->perms, &perm, 1);
> +

same here.

> +	return 0;
> +}
> +
> +static const struct of_device_id qcom_mpss_dsm_mem_of_match[] = {
> +	{ .compatible = "qcom,mpss-dsm-mem" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, qcom_mpss_dsm_mem_of_match);
> +
> +static struct platform_driver qcom_mpss_dsm_mem_driver = {
> +	.probe = qcom_mpss_dsm_mem_probe,
> +	.remove = qcom_mpss_dsm_mem_remove,
> +	.driver  = {
> +		.name  = "qcom_mpss_dsm_mem",
> +		.of_match_table = qcom_mpss_dsm_mem_of_match,
> +	},
> +};
> +
> +module_platform_driver(qcom_mpss_dsm_mem_driver);
> +
> +MODULE_AUTHOR("Linaro Ltd");
> +MODULE_DESCRIPTION("Qualcomm DSM memory driver");
> +MODULE_LICENSE("GPL");
> 

Re: [PATCH v2 1/2] dt-bindings: reserved-memory: document Qualcomm MPSS DSM memory

[Neil Armstrong]

On 18/11/2022 11:46, Krzysztof Kozlowski wrote:
> On 18/11/2022 09:53, Neil Armstrong wrote:
>> Document the Qualcomm Modem Processing SubSystem DSM shared memory.
>>
>> This memory zone is shared between the APPS and the MPSS subsystem,
>> and must be configured during the whole lifetime of the system.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
>> ---
>>   .../reserved-memory/qcom,mpss-dsm-mem.yaml         | 37 ++++++++++++++++++++++
>>   1 file changed, 37 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml b/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml
>> new file mode 100644
>> index 000000000000..226d0dfc422c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/reserved-memory/qcom,mpss-dsm-mem.yaml
>> @@ -0,0 +1,37 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/reserved-memory/qcom,mpss-dsm-mem.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm Modem Processing SubSystem DSM Memory
>> +
> 
> Discussion in v1 is still going. Memory region is not a device.

Nowhere is was affirmed this was a device.

> 
> Best regards,
> Krzysztof
> 

Re: [PATCH v2 0/2] soc: qcom: Add support for Qualcomm Modem Processing SubSystem DSM memory

[Neil Armstrong]

On 18/11/2022 09:53, Neil Armstrong wrote:
> The Qualcomm SM8550 SoC Modem Processing SubSystem requires that a memory
> region named DSM should be shared with the Application Processor SubSystem.
> 
> This adds bindings for this MPSS DSM memory and driver implementation to
> share this memory region with the Modem Processing SubSystem.
> 
> The MPSS DSM memory must be shared between the APPS SubSystem and the MPSS
> SubSystems, for the whole lifetime of the system.
> 
> To: Andy Gross <agross@kernel.org>
> To: Bjorn Andersson <andersson@kernel.org>
> To: Konrad Dybcio <konrad.dybcio@somainline.org>
> To: Rob Herring <robh+dt@kernel.org>
> To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
> To: Frank Rowand <frowand.list@gmail.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
> 
> ---
> Changes in v2:
> - Fixed the bindings
> - Added some precision on the MPSS DSM in commit messages
> - Link to v1: https://lore.kernel.org/r/20221114-narmstrong-sm8550-upstream-mpss_dsm-v1-0-158dc2bb6e96@linaro.org
> 
> ---
> Neil Armstrong (2):
>        dt-bindings: reserved-memory: document Qualcomm MPSS DSM memory
>        soc: qcom: add MDSS DSM memory driver
> 
>   .../reserved-memory/qcom,mpss-dsm-mem.yaml         | 37 +++++++++
>   drivers/of/platform.c                              |  1 +
>   drivers/soc/qcom/Kconfig                           | 10 +++
>   drivers/soc/qcom/Makefile                          |  1 +
>   drivers/soc/qcom/mpss_dsm_mem.c                    | 95 ++++++++++++++++++++++
>   5 files changed, 144 insertions(+)
> ---
> base-commit: 999e0145579c0e04174044a39257a4d96ee30020
> change-id: 20221114-narmstrong-sm8550-upstream-mpss_dsm-21c438c65f9b
> 
> Best regards,

After discussions on https://lore.kernel.org/all/20221114-narmstrong-sm8550-upstream-mpss_dsm-v1-0-158dc2bb6e96@linaro.org/,
handling of this memory zone will be integrated into the remoteproc PAS changes.

Neil