linux-kernel - Re: [PATCH v2 10/11] firmware: qcom-scm: add support for SHM bridge operations

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Message-ID: <4c7a0ba9-754a-4feb-b078-4b14a96b4a23@quicinc.com>
Date:   Thu, 28 Sep 2023 10:09:43 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        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: Re: [PATCH v2 10/11] firmware: qcom-scm: add support for SHM bridge
 operations


On 9/28/2023 2:20 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> Add low-level primitives for enabling SHM bridge support, creating SHM
> bridge pools and testing the availability of SHM bridges to qcom-scm. We
> don't yet provide a way to destroy the bridges as the first user will
> not require it.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

After fixing the typo:

Reviewed-by: Elliot Berman <quic_eberman@...cinc.com>

> ---
>  drivers/firmware/qcom/qcom_scm.c       | 43 ++++++++++++++++++++++++++
>  drivers/firmware/qcom/qcom_scm.h       |  2 ++
>  include/linux/firmware/qcom/qcom_scm.h |  6 ++++
>  3 files changed, 51 insertions(+)
> 
> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> index 1fa27c44f472..5969ff0c0beb 100644
> --- a/drivers/firmware/qcom/qcom_scm.c
> +++ b/drivers/firmware/qcom/qcom_scm.c
> @@ -1296,6 +1296,49 @@ bool qcom_scm_lmh_dcvsh_available(void)
>  }
>  EXPORT_SYMBOL_GPL(qcom_scm_lmh_dcvsh_available);
>  
> +int qcom_scm_enable_shm_bridge(void)
> +{
> +	struct qcom_scm_desc desc = {
> +		.svc = QCOM_SCM_SVC_MP,
> +		.cmd = QCOM_SCM_MP_SHM_BRIDGE_ENABLE,
> +		.owner = ARM_SMCCC_OWNER_SIP
> +	};
> +
> +	struct qcom_scm_res res;
> +
> +	if (!__qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_MP,
> +					  QCOM_SCM_MP_SHM_BRIDGE_ENABLE))
> +		return -EOPNOTSUPP;
> +
> +	return qcom_scm_call(__scm->dev, &desc, &res) ?: res.result[0];
> +}
> +EXPORT_SYMBOL_GPL(qcom_scm_enable_shm_bridge);
> +
> +int qcom_scm_create_shm_bridge(struct device *dev, u64 pfn_and_ns_perm_flags,
> +			       u64 ipfn_and_s_perm_flags, u64 size_and_flags,
> +			       u64 ns_vmids)
> +{
> +	struct qcom_scm_desc desc = {
> +		.svc = QCOM_SCM_SVC_MP,
> +		.cmd = QCOM_SCM_MP_SHM_BRDIGE_CREATE,

s/BRDIGE/BRIDGE/g

> +		.owner = ARM_SMCCC_OWNER_SIP,
> +		.args[0] = pfn_and_ns_perm_flags,
> +		.args[1] = ipfn_and_s_perm_flags,
> +		.args[2] = size_and_flags,
> +		.args[3] = ns_vmids,
> +		.arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_VAL, QCOM_SCM_VAL,
> +					 QCOM_SCM_VAL, QCOM_SCM_VAL),
> +	};
> +
> +	struct qcom_scm_res res;
> +	int ret;
> +
> +	ret = qcom_scm_call(__scm->dev, &desc, &res);
> +
> +	return ret ?: res.result[0];
> +}
> +EXPORT_SYMBOL_GPL(qcom_scm_create_shm_bridge);
> +
>  int qcom_scm_lmh_profile_change(u32 profile_id)
>  {
>  	struct qcom_scm_desc desc = {
> diff --git a/drivers/firmware/qcom/qcom_scm.h b/drivers/firmware/qcom/qcom_scm.h
> index 8c97e3906afa..f5a29bc0f549 100644
> --- a/drivers/firmware/qcom/qcom_scm.h
> +++ b/drivers/firmware/qcom/qcom_scm.h
> @@ -116,6 +116,8 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
>  #define QCOM_SCM_MP_IOMMU_SET_CP_POOL_SIZE	0x05
>  #define QCOM_SCM_MP_VIDEO_VAR			0x08
>  #define QCOM_SCM_MP_ASSIGN			0x16
> +#define QCOM_SCM_MP_SHM_BRIDGE_ENABLE		0x1c
> +#define QCOM_SCM_MP_SHM_BRDIGE_CREATE		0x1e

s/BRDIGE/BRIDGE/g

>  
>  #define QCOM_SCM_SVC_OCMEM		0x0f
>  #define QCOM_SCM_OCMEM_LOCK_CMD		0x01
> diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
> index 291ef8fd21b0..dc26cfd6d011 100644
> --- a/include/linux/firmware/qcom/qcom_scm.h
> +++ b/include/linux/firmware/qcom/qcom_scm.h
> @@ -6,6 +6,7 @@
>  #define __QCOM_SCM_H
>  
>  #include <linux/cleanup.h>
> +#include <linux/device.h>
>  #include <linux/err.h>
>  #include <linux/gfp.h>
>  #include <linux/types.h>
> @@ -122,6 +123,11 @@ int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
>  int qcom_scm_lmh_profile_change(u32 profile_id);
>  bool qcom_scm_lmh_dcvsh_available(void);
>  
> +int qcom_scm_enable_shm_bridge(void);
> +int qcom_scm_create_shm_bridge(struct device *dev, u64 pfn_and_ns_perm_flags,
> +			       u64 ipfn_and_s_perm_flags, u64 size_and_flags,
> +			       u64 ns_vmids);
> +
>  #ifdef CONFIG_QCOM_QSEECOM
>  
>  int qcom_scm_qseecom_app_get_id(const char *app_name, u32 *app_id);