Commit 933db703 authored by Sudeep Holla's avatar Sudeep Holla
Browse files

firmware: arm_ffa: Implement the notification bind and unbind interface 

A receiver endpoint must bind a notification to any sender endpoint
before the latter can signal the notification to the former. The receiver
assigns one or more doorbells to a specific sender. Only the sender can
ring these doorbells.

A receiver uses the FFA_NOTIFICATION_BIND interface to bind one or more
notifications to the sender. A receiver un-binds a notification from a
sender endpoint to stop the notification from being signaled. It uses
the FFA_NOTIFICATION_UNBIND interface to do this.

Allow the FF-A driver to be able to bind and unbind a given notification
ID to a specific partition ID. This will be used to register and
unregister notification callbacks from the FF-A client drivers.

Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-3-cddd3237809c@arm.com


Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent 192e88cf

drivers/firmware/arm_ffa/driver.c

+29 −0
Original line number Diff line number Diff line
@@ -587,6 +587,35 @@ static int ffa_notification_bitmap_destroy(void) 
	return 0;

}



#define NOTIFICATION_LOW_MASK		GENMASK(31, 0)

#define NOTIFICATION_HIGH_MASK		GENMASK(63, 32)

#define NOTIFICATION_BITMAP_HIGH(x)	\

		((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))

#define NOTIFICATION_BITMAP_LOW(x)	\

		((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))



static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,

					u32 flags, bool is_bind)

{

	ffa_value_t ret;

	u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id);



	func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND;



	invoke_ffa_fn((ffa_value_t){

		  .a0 = func, .a1 = src_dst_ids, .a2 = flags,

		  .a3 = NOTIFICATION_BITMAP_LOW(bitmap),

		  .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),

		  }, &ret);



	if (ret.a0 == FFA_ERROR)

		return ffa_to_linux_errno((int)ret.a2);

	else if (ret.a0 != FFA_SUCCESS)

		return -EINVAL;



	return 0;

}



static void ffa_set_up_mem_ops_native_flag(void)

{

	if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||