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

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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: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: Andrew 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: Elliot Berman <quic_eberman@quicinc.com>
Link: https://lore.kernel.org/r/20240527-shm-bridge-v10-10-ce7afaa58d3a@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Bartosz Golaszewski 2024-05-27 14:55:00 +02:00 committed by Bjorn Andersson
parent 6612103ec3
commit 178e19c0df
3 changed files with 69 additions and 0 deletions
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60
drivers/firmware/qcom/qcom_scm.c
View File

@ -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 = {

3
drivers/firmware/qcom/qcom_scm.h
View File

@ -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

6
include/linux/firmware/qcom/qcom_scm.h
View File

@ -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);