/* $Id$ * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1992 - 1997, 2000 Silicon Graphics, Inc. * Copyright (C) 2000 by Colin Ngam */ #ifndef _ASM_SN_IOERROR_HANDLING_H #define _ASM_SN_IOERROR_HANDLING_H #include #if __KERNEL__ /* * Basic types required for io error handling interfaces. */ /* * Return code from the io error handling interfaces. */ enum error_return_code_e { /* Success */ ERROR_RETURN_CODE_SUCCESS, /* Unknown failure */ ERROR_RETURN_CODE_GENERAL_FAILURE, /* Nth error noticed while handling the first error */ ERROR_RETURN_CODE_NESTED_CALL, /* State of the vertex is invalid */ ERROR_RETURN_CODE_INVALID_STATE, /* Invalid action */ ERROR_RETURN_CODE_INVALID_ACTION, /* Valid action but not cannot set it */ ERROR_RETURN_CODE_CANNOT_SET_ACTION, /* Valid action but not possible for the current state */ ERROR_RETURN_CODE_CANNOT_PERFORM_ACTION, /* Valid state but cannot change the state of the vertex to it */ ERROR_RETURN_CODE_CANNOT_SET_STATE, /* ??? */ ERROR_RETURN_CODE_DUPLICATE, /* Reached the root of the system critical graph */ ERROR_RETURN_CODE_SYS_CRITICAL_GRAPH_BEGIN, /* Reached the leaf of the system critical graph */ ERROR_RETURN_CODE_SYS_CRITICAL_GRAPH_ADD, /* Cannot shutdown the device in hw/sw */ ERROR_RETURN_CODE_SHUTDOWN_FAILED, /* Cannot restart the device in hw/sw */ ERROR_RETURN_CODE_RESET_FAILED, /* Cannot failover the io subsystem */ ERROR_RETURN_CODE_FAILOVER_FAILED, /* No Jump Buffer exists */ ERROR_RETURN_CODE_NO_JUMP_BUFFER }; typedef uint64_t error_return_code_t; /* * State of the vertex during error handling. */ enum error_state_e { /* Ignore state */ ERROR_STATE_IGNORE, /* Invalid state */ ERROR_STATE_NONE, /* Trying to decipher the error bits */ ERROR_STATE_LOOKUP, /* Trying to carryout the action decided upon after * looking at the error bits */ ERROR_STATE_ACTION, /* Donot allow any other operations to this vertex from * other parts of the kernel. This is also used to indicate * that the device has been software shutdown. */ ERROR_STATE_SHUTDOWN, /* This is a transitory state when no new requests are accepted * on behalf of the device. This is usually used when trying to * quiesce all the outstanding operations and preparing the * device for a failover / shutdown etc. */ ERROR_STATE_SHUTDOWN_IN_PROGRESS, /* This is the state when there is absolutely no activity going * on wrt device. */ ERROR_STATE_SHUTDOWN_COMPLETE, /* This is the state when the device has issued a retry. */ ERROR_STATE_RETRY, /* This is the normal state. This can also be used to indicate * that the device has been software-enabled after software- * shutting down previously. */ ERROR_STATE_NORMAL }; typedef uint64_t error_state_t; /* * Generic error classes. This is used to classify errors after looking * at the error bits and helpful in deciding on the action. */ enum error_class_e { /* Unclassified error */ ERROR_CLASS_UNKNOWN, /* LLP transmit error */ ERROR_CLASS_LLP_XMIT, /* LLP receive error */ ERROR_CLASS_LLP_RECV, /* Credit error */ ERROR_CLASS_CREDIT, /* Timeout error */ ERROR_CLASS_TIMEOUT, /* Access error */ ERROR_CLASS_ACCESS, /* System coherency error */ ERROR_CLASS_SYS_COHERENCY, /* Bad data error (ecc / parity etc) */ ERROR_CLASS_BAD_DATA, /* Illegal request packet */ ERROR_CLASS_BAD_REQ_PKT, /* Illegal response packet */ ERROR_CLASS_BAD_RESP_PKT }; typedef uint64_t error_class_t; /* * Error context which the error action can use. */ typedef void *error_context_t; #define ERROR_CONTEXT_IGNORE ((error_context_t)-1ll) /* * Error action type. */ typedef error_return_code_t (*error_action_f)( error_context_t); #define ERROR_ACTION_IGNORE ((error_action_f)-1ll) /* Typical set of error actions */ typedef struct error_action_set_s { error_action_f eas_panic; error_action_f eas_shutdown; error_action_f eas_abort; error_action_f eas_retry; error_action_f eas_failover; error_action_f eas_log_n_ignore; error_action_f eas_reset; } error_action_set_t; /* Set of priorites for in case mutliple error actions/states * are trying to be prescribed for a device. * NOTE : The ordering below encapsulates the priorities. Highest value * corresponds to highest priority. */ enum error_priority_e { ERROR_PRIORITY_IGNORE, ERROR_PRIORITY_NONE, ERROR_PRIORITY_NORMAL, ERROR_PRIORITY_LOG, ERROR_PRIORITY_FAILOVER, ERROR_PRIORITY_RETRY, ERROR_PRIORITY_ABORT, ERROR_PRIORITY_SHUTDOWN, ERROR_PRIORITY_RESTART, ERROR_PRIORITY_PANIC }; typedef uint64_t error_priority_t; /* Error state interfaces */ #if defined(CONFIG_SGI_IO_ERROR_HANDLING) extern error_return_code_t error_state_set(devfs_handle_t,error_state_t); extern error_state_t error_state_get(devfs_handle_t); #endif /* System critical graph interfaces */ extern boolean_t is_sys_critical_vertex(devfs_handle_t); extern devfs_handle_t sys_critical_first_child_get(devfs_handle_t); extern devfs_handle_t sys_critical_next_child_get(devfs_handle_t); extern devfs_handle_t sys_critical_parent_get(devfs_handle_t); extern error_return_code_t sys_critical_graph_vertex_add(devfs_handle_t, devfs_handle_t new); /* Error action interfaces */ extern error_return_code_t error_action_set(devfs_handle_t, error_action_f, error_context_t, error_priority_t); extern error_return_code_t error_action_perform(devfs_handle_t); #define INFO_LBL_ERROR_SKIP_ENV "error_skip_env" #define v_error_skip_env_get(v, l) \ hwgraph_info_get_LBL(v, INFO_LBL_ERROR_SKIP_ENV, (arbitrary_info_t *)&l) #define v_error_skip_env_set(v, l, r) \ (r ? \ hwgraph_info_replace_LBL(v, INFO_LBL_ERROR_SKIP_ENV, (arbitrary_info_t)l,0) :\ hwgraph_info_add_LBL(v, INFO_LBL_ERROR_SKIP_ENV, (arbitrary_info_t)l)) #define v_error_skip_env_clear(v) \ hwgraph_info_remove_LBL(v, INFO_LBL_ERROR_SKIP_ENV, 0) /* Skip point interfaces */ extern error_return_code_t error_skip_point_jump(devfs_handle_t, boolean_t); extern error_return_code_t error_skip_point_clear(devfs_handle_t); /* REFERENCED */ #if defined(CONFIG_SGI_IO_ERROR_HANDLING) inline static int error_skip_point_mark(devfs_handle_t v) { label_t *error_env = NULL; int code = 0; /* Check if we have a valid hwgraph vertex */ #ifdef LATER if (!dev_is_vertex(v)) return(code); #endif /* There is no error jump buffer for this device vertex. Allocate * one. */ if (v_error_skip_env_get(v, error_env) != GRAPH_SUCCESS) { error_env = kmem_zalloc(sizeof(label_t), KM_NOSLEEP); /* Unable to allocate memory for jum buffer. This should * be a very rare occurrence. */ if (!error_env) return(-1); /* Store the jump buffer information on the vertex.*/ if (v_error_skip_env_set(v, error_env, 0) != GRAPH_SUCCESS) return(-2); } ASSERT(v_error_skip_env_get(v, error_env) == GRAPH_SUCCESS); code = setjmp(*error_env); return(code); } #endif /* CONFIG_SGI_IO_ERROR_HANDLING */ typedef uint64_t counter_t; extern counter_t error_retry_count_get(devfs_handle_t); extern error_return_code_t error_retry_count_set(devfs_handle_t,counter_t); extern counter_t error_retry_count_increment(devfs_handle_t); extern counter_t error_retry_count_decrement(devfs_handle_t); /* Except for the PIO Read error typically the other errors are handled in * the context of an asynchronous error interrupt. */ #define IS_ERROR_INTR_CONTEXT(_ec) ((_ec & IOECODE_DMA) || \ (_ec == IOECODE_PIO_WRITE)) /* Some convenience macros on device state. This state is accessed only * thru the calls the io error handling layer. */ #if defined(CONFIG_SGI_IO_ERROR_HANDLING) extern boolean_t is_device_shutdown(devfs_handle_t); #define IS_DEVICE_SHUTDOWN(_d) (is_device_shutdown(_d)) #endif #endif /* __KERNEL__ */ #endif /* _ASM_SN_IOERROR_HANDLING_H */