/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. */ #ifndef __GRU_KSERVICES_H_ #define __GRU_KSERVICES_H_ /* * Message queues using the GRU to send/receive messages. * * These function allow the user to create a message queue for * sending/receiving 1 or 2 cacheline messages using the GRU. * * Processes SENDING messages will use a kernel CBR/DSR to send * the message. This is transparent to the caller. * * The receiver does not use any GRU resources. * * The functions support: * - single receiver * - multiple senders * - cross partition message * * Missing features ZZZ: * - user options for dealing with timeouts, queue full, etc. * - gru_create_message_queue() needs interrupt vector info */ struct gru_message_queue_desc { … }; /* * Initialize a user allocated chunk of memory to be used as * a message queue. The caller must ensure that the queue is * in contiguous physical memory and is cacheline aligned. * * Message queue size is the total number of bytes allocated * to the queue including a 2 cacheline header that is used * to manage the queue. * * Input: * mqd pointer to message queue descriptor * p pointer to user allocated mesq memory. * bytes size of message queue in bytes * vector interrupt vector (zero if no interrupts) * nasid nasid of blade where interrupt is delivered * apicid apicid of cpu for interrupt * * Errors: * 0 OK * >0 error */ extern int gru_create_message_queue(struct gru_message_queue_desc *mqd, void *p, unsigned int bytes, int nasid, int vector, int apicid); /* * Send a message to a message queue. * * Note: The message queue transport mechanism uses the first 32 * bits of the message. Users should avoid using these bits. * * * Input: * mqd pointer to message queue descriptor * mesg pointer to message. Must be 64-bit aligned * bytes size of message in bytes * * Output: * 0 message sent * >0 Send failure - see error codes below * */ extern int gru_send_message_gpa(struct gru_message_queue_desc *mqd, void *mesg, unsigned int bytes); /* Status values for gru_send_message() */ #define MQE_OK … #define MQE_CONGESTION … #define MQE_QUEUE_FULL … #define MQE_UNEXPECTED_CB_ERR … #define MQE_PAGE_OVERFLOW … #define MQE_BUG_NO_RESOURCES … /* * Advance the receive pointer for the message queue to the next message. * Note: current API requires messages to be gotten & freed in order. Future * API extensions may allow for out-of-order freeing. * * Input * mqd pointer to message queue descriptor * mesq message being freed */ extern void gru_free_message(struct gru_message_queue_desc *mqd, void *mesq); /* * Get next message from message queue. Returns pointer to * message OR NULL if no message present. * User must call gru_free_message() after message is processed * in order to move the queue pointers to next message. * * Input * mqd pointer to message queue descriptor * * Output: * p pointer to message * NULL no message available */ extern void *gru_get_next_message(struct gru_message_queue_desc *mqd); /* * Read a GRU global GPA. Source can be located in a remote partition. * * Input: * value memory address where MMR value is returned * gpa source numalink physical address of GPA * * Output: * 0 OK * >0 error */ int gru_read_gpa(unsigned long *value, unsigned long gpa); /* * Copy data using the GRU. Source or destination can be located in a remote * partition. * * Input: * dest_gpa destination global physical address * src_gpa source global physical address * bytes number of bytes to copy * * Output: * 0 OK * >0 error */ extern int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa, unsigned int bytes); /* * Reserve GRU resources to be used asynchronously. * * input: * blade_id - blade on which resources should be reserved * cbrs - number of CBRs * dsr_bytes - number of DSR bytes needed * cmp - completion structure for waiting for * async completions * output: * handle to identify resource * (0 = no resources) */ extern unsigned long gru_reserve_async_resources(int blade_id, int cbrs, int dsr_bytes, struct completion *cmp); /* * Release async resources previously reserved. * * input: * han - handle to identify resources */ extern void gru_release_async_resources(unsigned long han); /* * Wait for async GRU instructions to complete. * * input: * han - handle to identify resources */ extern void gru_wait_async_cbr(unsigned long han); /* * Lock previous reserved async GRU resources * * input: * han - handle to identify resources * output: * cb - pointer to first CBR * dsr - pointer to first DSR */ extern void gru_lock_async_resource(unsigned long han, void **cb, void **dsr); /* * Unlock previous reserved async GRU resources * * input: * han - handle to identify resources */ extern void gru_unlock_async_resource(unsigned long han); #endif /* __GRU_KSERVICES_H_ */
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