@@ -604,6 +604,23 @@ static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
return 0;
}
+static int ffa_run(struct ffa_device *dev, u16 vcpu)
+{
+ ffa_value_t ret;
+ u32 target = dev->vm_id << 16 | vcpu;
+
+ invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &ret);
+
+ while (ret.a0 == FFA_INTERRUPT)
+ invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = ret.a1, },
+ &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ return 0;
+}
+
static void ffa_set_up_mem_ops_native_flag(void)
{
if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
@@ -696,10 +713,15 @@ static const struct ffa_mem_ops ffa_drv_mem_ops = {
.memory_lend = ffa_memory_lend,
};
+static const struct ffa_cpu_ops ffa_drv_cpu_ops = {
+ .run = ffa_run,
+};
+
static const struct ffa_ops ffa_drv_ops = {
.info_ops = &ffa_drv_info_ops,
.msg_ops = &ffa_drv_msg_ops,
.mem_ops = &ffa_drv_mem_ops,
+ .cpu_ops = &ffa_drv_cpu_ops,
};
void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
@@ -387,10 +387,15 @@ struct ffa_mem_ops {
int (*memory_lend)(struct ffa_mem_ops_args *args);
};
+struct ffa_cpu_ops {
+ int (*run)(struct ffa_device *dev, u16 vcpu);
+};
+
struct ffa_ops {
const struct ffa_info_ops *info_ops;
const struct ffa_msg_ops *msg_ops;
const struct ffa_mem_ops *mem_ops;
+ const struct ffa_cpu_ops *cpu_ops;
};
#endif /* _LINUX_ARM_FFA_H */
FFA_RUN is used by a scheduler to allocate CPU cycles to a target endpoint execution context specified in the target information parameter. If the endpoint execution context is in the waiting/blocked state, it transitions to the running state. Expose the ability to call FFA_RUN in order to give any partition in the system cpu cycles to perform IMPDEF functionality. Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> --- drivers/firmware/arm_ffa/driver.c | 22 ++++++++++++++++++++++ include/linux/arm_ffa.h | 5 +++++ 2 files changed, 27 insertions(+)