Commit 178e19c0 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski Committed by Bjorn Andersson
Browse files

firmware: qcom: scm: add support for SHM bridge operations 



SHM Bridge is a safety mechanism allowing to limit the amount of memory
shared between the kernel and the TrustZone to regions explicitly marked
as such.

Add low-level primitives for enabling SHM bridge support as well as
creating and destroying SHM bridges to qcom-scm.

Signed-off-by: default avatarBartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: default avatarAndrew Halaney <ahalaney@redhat.com>
Tested-by: Andrew Halaney <ahalaney@redhat.com> # sc8280xp-lenovo-thinkpad-x13s
Tested-by: Deepti Jaggi <quic_djaggi@quicinc.com> #sa8775p-ride
Reviewed-by: default avatarElliot Berman <quic_eberman@quicinc.com>
Link: https://lore.kernel.org/r/20240527-shm-bridge-v10-10-ce7afaa58d3a@linaro.org


Signed-off-by: default avatarBjorn Andersson <andersson@kernel.org>
parent 6612103e

drivers/firmware/qcom/qcom_scm.c

+60 −0
Original line number Diff line number Diff line
@@ -1343,6 +1343,66 @@ bool qcom_scm_lmh_dcvsh_available(void) 
}

EXPORT_SYMBOL_GPL(qcom_scm_lmh_dcvsh_available);



int qcom_scm_shm_bridge_enable(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_shm_bridge_enable);



int qcom_scm_shm_bridge_create(struct device *dev, u64 pfn_and_ns_perm_flags,

			       u64 ipfn_and_s_perm_flags, u64 size_and_flags,

			       u64 ns_vmids, u64 *handle)

{

	struct qcom_scm_desc desc = {

		.svc = QCOM_SCM_SVC_MP,

		.cmd = QCOM_SCM_MP_SHM_BRIDGE_CREATE,

		.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);



	if (handle && !ret)

		*handle = res.result[1];



	return ret ?: res.result[0];

}

EXPORT_SYMBOL_GPL(qcom_scm_shm_bridge_create);



int qcom_scm_shm_bridge_delete(struct device *dev, u64 handle)

{

	struct qcom_scm_desc desc = {

		.svc = QCOM_SCM_SVC_MP,

		.cmd = QCOM_SCM_MP_SHM_BRIDGE_DELETE,

		.owner = ARM_SMCCC_OWNER_SIP,

		.args[0] = handle,

		.arginfo = QCOM_SCM_ARGS(1, QCOM_SCM_VAL),

	};



	return qcom_scm_call(__scm->dev, &desc, NULL);

}

EXPORT_SYMBOL_GPL(qcom_scm_shm_bridge_delete);



int qcom_scm_lmh_profile_change(u32 profile_id)

{

	struct qcom_scm_desc desc = {

drivers/firmware/qcom/qcom_scm.h

+3 −0
Original line number Diff line number Diff line
@@ -116,6 +116,9 @@ struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void); 
#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_BRIDGE_DELETE		0x1d

#define QCOM_SCM_MP_SHM_BRIDGE_CREATE		0x1e



#define QCOM_SCM_SVC_OCMEM		0x0f

#define QCOM_SCM_OCMEM_LOCK_CMD		0x01

include/linux/firmware/qcom/qcom_scm.h

+6 −0
Original line number Diff line number Diff line
@@ -138,6 +138,12 @@ bool qcom_scm_lmh_dcvsh_available(void); 


int qcom_scm_gpu_init_regs(u32 gpu_req);



int qcom_scm_shm_bridge_enable(void);

int qcom_scm_shm_bridge_create(struct device *dev, u64 pfn_and_ns_perm_flags,

			       u64 ipfn_and_s_perm_flags, u64 size_and_flags,

			       u64 ns_vmids, u64 *handle);

int qcom_scm_shm_bridge_delete(struct device *dev, u64 handle);



#ifdef CONFIG_QCOM_QSEECOM



int qcom_scm_qseecom_app_get_id(const char *app_name, u32 *app_id);