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ACPI for Arm Components 1.1 Platform Design Document v1.1 [0] specifices Arm Generic Diagnostic Device Interface (AGDI). It allows an admin to issue diagnostic dump and reset via an SDEI event or an interrupt. This patch implements SDEI path. [0] https://developer.arm.com/documentation/den0093/latest/ Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com> Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>