181 lines
4.6 KiB
C
Executable file
181 lines
4.6 KiB
C
Executable file
/*
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* Copyright 2016-17 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_POWERPC_VAS_H
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#define _ASM_POWERPC_VAS_H
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struct vas_window;
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/*
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* Min and max FIFO sizes are based on Version 1.05 Section 3.1.4.25
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* (Local FIFO Size Register) of the VAS workbook.
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*/
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#define VAS_RX_FIFO_SIZE_MIN (1 << 10) /* 1KB */
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#define VAS_RX_FIFO_SIZE_MAX (8 << 20) /* 8MB */
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/*
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* Threshold Control Mode: Have paste operation fail if the number of
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* requests in receive FIFO exceeds a threshold.
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*
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* NOTE: No special error code yet if paste is rejected because of these
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* limits. So users can't distinguish between this and other errors.
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*/
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#define VAS_THRESH_DISABLED 0
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#define VAS_THRESH_FIFO_GT_HALF_FULL 1
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#define VAS_THRESH_FIFO_GT_QTR_FULL 2
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#define VAS_THRESH_FIFO_GT_EIGHTH_FULL 3
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/*
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* Get/Set bit fields
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*/
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#define GET_FIELD(m, v) (((v) & (m)) >> MASK_LSH(m))
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#define MASK_LSH(m) (__builtin_ffsl(m) - 1)
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#define SET_FIELD(m, v, val) \
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(((v) & ~(m)) | ((((typeof(v))(val)) << MASK_LSH(m)) & (m)))
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/*
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* Co-processor Engine type.
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*/
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enum vas_cop_type {
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VAS_COP_TYPE_FAULT,
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VAS_COP_TYPE_842,
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VAS_COP_TYPE_842_HIPRI,
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VAS_COP_TYPE_GZIP,
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VAS_COP_TYPE_GZIP_HIPRI,
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VAS_COP_TYPE_FTW,
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VAS_COP_TYPE_MAX,
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};
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/*
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* Receive window attributes specified by the (in-kernel) owner of window.
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*/
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struct vas_rx_win_attr {
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void *rx_fifo;
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int rx_fifo_size;
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int wcreds_max;
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bool pin_win;
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bool rej_no_credit;
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bool tx_wcred_mode;
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bool rx_wcred_mode;
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bool tx_win_ord_mode;
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bool rx_win_ord_mode;
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bool data_stamp;
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bool nx_win;
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bool fault_win;
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bool user_win;
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bool notify_disable;
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bool intr_disable;
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bool notify_early;
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int lnotify_lpid;
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int lnotify_pid;
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int lnotify_tid;
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u32 pswid;
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int tc_mode;
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};
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/*
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* Window attributes specified by the in-kernel owner of a send window.
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*/
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struct vas_tx_win_attr {
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enum vas_cop_type cop;
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int wcreds_max;
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int lpid;
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int pidr; /* hardware PID (from SPRN_PID) */
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int pid; /* linux process id */
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int pswid;
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int rsvd_txbuf_count;
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int tc_mode;
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bool user_win;
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bool pin_win;
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bool rej_no_credit;
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bool rsvd_txbuf_enable;
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bool tx_wcred_mode;
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bool rx_wcred_mode;
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bool tx_win_ord_mode;
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bool rx_win_ord_mode;
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};
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/*
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* Helper to map a chip id to VAS id.
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* For POWER9, this is a 1:1 mapping. In the future this maybe a 1:N
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* mapping in which case, we will need to update this helper.
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*
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* Return the VAS id or -1 if no matching vasid is found.
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*/
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int chip_to_vas_id(int chipid);
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/*
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* Helper to initialize receive window attributes to defaults for an
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* NX window.
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*/
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void vas_init_rx_win_attr(struct vas_rx_win_attr *rxattr, enum vas_cop_type cop);
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/*
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* Open a VAS receive window for the instance of VAS identified by @vasid
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* Use @attr to initialize the attributes of the window.
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*
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* Return a handle to the window or ERR_PTR() on error.
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*/
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struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop,
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struct vas_rx_win_attr *attr);
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/*
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* Helper to initialize send window attributes to defaults for an NX window.
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*/
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extern void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr,
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enum vas_cop_type cop);
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/*
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* Open a VAS send window for the instance of VAS identified by @vasid
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* and the co-processor type @cop. Use @attr to initialize attributes
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* of the window.
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*
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* Note: The instance of VAS must already have an open receive window for
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* the coprocessor type @cop.
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*
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* Return a handle to the send window or ERR_PTR() on error.
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*/
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struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop,
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struct vas_tx_win_attr *attr);
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/*
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* Close the send or receive window identified by @win. For receive windows
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* return -EAGAIN if there are active send windows attached to this receive
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* window.
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*/
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int vas_win_close(struct vas_window *win);
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/*
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* Copy the co-processor request block (CRB) @crb into the local L2 cache.
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*/
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int vas_copy_crb(void *crb, int offset);
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/*
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* Paste a previously copied CRB (see vas_copy_crb()) from the L2 cache to
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* the hardware address associated with the window @win. @re is expected/
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* assumed to be true for NX windows.
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*/
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int vas_paste_crb(struct vas_window *win, int offset, bool re);
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/*
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* Return a system-wide unique id for the VAS window @win.
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*/
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extern u32 vas_win_id(struct vas_window *win);
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/*
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* Return the power bus paste address associated with @win so the caller
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* can map that address into their address space.
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*/
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extern u64 vas_win_paste_addr(struct vas_window *win);
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#endif /* __ASM_POWERPC_VAS_H */
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