Commit fe2ddb6b authored by Sudeep Holla's avatar Sudeep Holla
Browse files

firmware: arm_ffa: Implement the FFA_RUN interface 

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.

Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-4-cddd3237809c@arm.com


Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent 933db703

drivers/firmware/arm_ffa/driver.c

+22 −0
Original line number Diff line number Diff line
@@ -616,6 +616,23 @@ 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) ||
@@ -700,10 +717,15 @@ 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)

include/linux/arm_ffa.h

+5 −0
Original line number Diff line number Diff line
@@ -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 */