202 lines
5.5 KiB
C
202 lines
5.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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*/
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#ifndef __GRU_KSERVICES_H_
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#define __GRU_KSERVICES_H_
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/*
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* Message queues using the GRU to send/receive messages.
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*
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* These function allow the user to create a message queue for
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* sending/receiving 1 or 2 cacheline messages using the GRU.
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*
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* Processes SENDING messages will use a kernel CBR/DSR to send
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* the message. This is transparent to the caller.
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*
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* The receiver does not use any GRU resources.
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*
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* The functions support:
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* - single receiver
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* - multiple senders
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* - cross partition message
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*
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* Missing features ZZZ:
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* - user options for dealing with timeouts, queue full, etc.
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* - gru_create_message_queue() needs interrupt vector info
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*/
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struct gru_message_queue_desc {
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void *mq; /* message queue vaddress */
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unsigned long mq_gpa; /* global address of mq */
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int qlines; /* queue size in CL */
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int interrupt_vector; /* interrupt vector */
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int interrupt_pnode; /* pnode for interrupt */
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int interrupt_apicid; /* lapicid for interrupt */
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};
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/*
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* Initialize a user allocated chunk of memory to be used as
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* a message queue. The caller must ensure that the queue is
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* in contiguous physical memory and is cacheline aligned.
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*
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* Message queue size is the total number of bytes allocated
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* to the queue including a 2 cacheline header that is used
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* to manage the queue.
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*
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* Input:
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* mqd pointer to message queue descriptor
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* p pointer to user allocated mesq memory.
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* bytes size of message queue in bytes
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* vector interrupt vector (zero if no interrupts)
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* nasid nasid of blade where interrupt is delivered
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* apicid apicid of cpu for interrupt
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*
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* Errors:
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* 0 OK
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* >0 error
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*/
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extern int gru_create_message_queue(struct gru_message_queue_desc *mqd,
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void *p, unsigned int bytes, int nasid, int vector, int apicid);
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/*
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* Send a message to a message queue.
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*
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* Note: The message queue transport mechanism uses the first 32
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* bits of the message. Users should avoid using these bits.
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*
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*
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* Input:
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* mqd pointer to message queue descriptor
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* mesg pointer to message. Must be 64-bit aligned
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* bytes size of message in bytes
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*
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* Output:
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* 0 message sent
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* >0 Send failure - see error codes below
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*
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*/
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extern int gru_send_message_gpa(struct gru_message_queue_desc *mqd,
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void *mesg, unsigned int bytes);
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/* Status values for gru_send_message() */
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#define MQE_OK 0 /* message sent successfully */
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#define MQE_CONGESTION 1 /* temporary congestion, try again */
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#define MQE_QUEUE_FULL 2 /* queue is full */
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#define MQE_UNEXPECTED_CB_ERR 3 /* unexpected CB error */
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#define MQE_PAGE_OVERFLOW 10 /* BUG - queue overflowed a page */
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#define MQE_BUG_NO_RESOURCES 11 /* BUG - could not alloc GRU cb/dsr */
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/*
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* Advance the receive pointer for the message queue to the next message.
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* Note: current API requires messages to be gotten & freed in order. Future
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* API extensions may allow for out-of-order freeing.
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*
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* Input
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* mqd pointer to message queue descriptor
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* mesq message being freed
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*/
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extern void gru_free_message(struct gru_message_queue_desc *mqd,
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void *mesq);
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/*
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* Get next message from message queue. Returns pointer to
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* message OR NULL if no message present.
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* User must call gru_free_message() after message is processed
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* in order to move the queue pointers to next message.
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*
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* Input
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* mqd pointer to message queue descriptor
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*
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* Output:
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* p pointer to message
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* NULL no message available
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*/
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extern void *gru_get_next_message(struct gru_message_queue_desc *mqd);
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/*
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* Read a GRU global GPA. Source can be located in a remote partition.
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*
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* Input:
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* value memory address where MMR value is returned
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* gpa source numalink physical address of GPA
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*
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* Output:
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* 0 OK
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* >0 error
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*/
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int gru_read_gpa(unsigned long *value, unsigned long gpa);
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/*
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* Copy data using the GRU. Source or destination can be located in a remote
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* partition.
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*
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* Input:
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* dest_gpa destination global physical address
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* src_gpa source global physical address
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* bytes number of bytes to copy
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*
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* Output:
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* 0 OK
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* >0 error
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*/
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extern int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa,
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unsigned int bytes);
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/*
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* Reserve GRU resources to be used asynchronously.
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*
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* input:
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* blade_id - blade on which resources should be reserved
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* cbrs - number of CBRs
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* dsr_bytes - number of DSR bytes needed
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* cmp - completion structure for waiting for
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* async completions
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* output:
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* handle to identify resource
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* (0 = no resources)
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*/
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extern unsigned long gru_reserve_async_resources(int blade_id, int cbrs, int dsr_bytes,
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struct completion *cmp);
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/*
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* Release async resources previously reserved.
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*
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* input:
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* han - handle to identify resources
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*/
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extern void gru_release_async_resources(unsigned long han);
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/*
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* Wait for async GRU instructions to complete.
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*
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* input:
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* han - handle to identify resources
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*/
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extern void gru_wait_async_cbr(unsigned long han);
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/*
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* Lock previous reserved async GRU resources
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*
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* input:
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* han - handle to identify resources
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* output:
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* cb - pointer to first CBR
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* dsr - pointer to first DSR
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*/
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extern void gru_lock_async_resource(unsigned long han, void **cb, void **dsr);
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/*
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* Unlock previous reserved async GRU resources
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*
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* input:
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* han - handle to identify resources
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*/
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extern void gru_unlock_async_resource(unsigned long han);
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#endif /* __GRU_KSERVICES_H_ */
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