mirror of https://gitee.com/openkylin/linux.git
184 lines
4.7 KiB
C
184 lines
4.7 KiB
C
/*
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* GRU KERNEL MCS INSTRUCTIONS
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include "gru.h"
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#include "grulib.h"
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#include "grutables.h"
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/* 10 sec */
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#ifdef CONFIG_IA64
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#include <asm/processor.h>
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#define GRU_OPERATION_TIMEOUT (((cycles_t) local_cpu_data->itc_freq)*10)
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#else
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#include <asm/tsc.h>
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#define GRU_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
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#endif
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/* Extract the status field from a kernel handle */
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#define GET_MSEG_HANDLE_STATUS(h) (((*(unsigned long *)(h)) >> 16) & 3)
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struct mcs_op_statistic mcs_op_statistics[mcsop_last];
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static void update_mcs_stats(enum mcs_op op, unsigned long clks)
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{
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atomic_long_inc(&mcs_op_statistics[op].count);
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atomic_long_add(clks, &mcs_op_statistics[op].total);
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if (mcs_op_statistics[op].max < clks)
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mcs_op_statistics[op].max = clks;
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}
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static void start_instruction(void *h)
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{
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unsigned long *w0 = h;
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wmb(); /* setting CMD bit must be last */
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*w0 = *w0 | 1;
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gru_flush_cache(h);
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}
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static int wait_instruction_complete(void *h, enum mcs_op opc)
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{
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int status;
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cycles_t start_time = get_cycles();
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while (1) {
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cpu_relax();
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status = GET_MSEG_HANDLE_STATUS(h);
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if (status != CCHSTATUS_ACTIVE)
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break;
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if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time))
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panic("GRU %p is malfunctioning\n", h);
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}
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if (gru_options & OPT_STATS)
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update_mcs_stats(opc, get_cycles() - start_time);
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return status;
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}
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int cch_allocate(struct gru_context_configuration_handle *cch,
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int asidval, int sizeavail, unsigned long cbrmap,
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unsigned long dsrmap)
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{
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int i;
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for (i = 0; i < 8; i++) {
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cch->asid[i] = (asidval++);
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cch->sizeavail[i] = sizeavail;
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}
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cch->dsr_allocation_map = dsrmap;
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cch->cbr_allocation_map = cbrmap;
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cch->opc = CCHOP_ALLOCATE;
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start_instruction(cch);
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return wait_instruction_complete(cch, cchop_allocate);
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}
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int cch_start(struct gru_context_configuration_handle *cch)
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{
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cch->opc = CCHOP_START;
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start_instruction(cch);
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return wait_instruction_complete(cch, cchop_start);
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}
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int cch_interrupt(struct gru_context_configuration_handle *cch)
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{
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cch->opc = CCHOP_INTERRUPT;
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start_instruction(cch);
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return wait_instruction_complete(cch, cchop_interrupt);
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}
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int cch_deallocate(struct gru_context_configuration_handle *cch)
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{
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cch->opc = CCHOP_DEALLOCATE;
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start_instruction(cch);
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return wait_instruction_complete(cch, cchop_deallocate);
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}
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int cch_interrupt_sync(struct gru_context_configuration_handle
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*cch)
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{
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cch->opc = CCHOP_INTERRUPT_SYNC;
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start_instruction(cch);
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return wait_instruction_complete(cch, cchop_interrupt_sync);
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}
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int tgh_invalidate(struct gru_tlb_global_handle *tgh,
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unsigned long vaddr, unsigned long vaddrmask,
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int asid, int pagesize, int global, int n,
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unsigned short ctxbitmap)
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{
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tgh->vaddr = vaddr;
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tgh->asid = asid;
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tgh->pagesize = pagesize;
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tgh->n = n;
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tgh->global = global;
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tgh->vaddrmask = vaddrmask;
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tgh->ctxbitmap = ctxbitmap;
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tgh->opc = TGHOP_TLBINV;
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start_instruction(tgh);
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return wait_instruction_complete(tgh, tghop_invalidate);
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}
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void tfh_write_only(struct gru_tlb_fault_handle *tfh,
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unsigned long pfn, unsigned long vaddr,
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int asid, int dirty, int pagesize)
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{
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tfh->fillasid = asid;
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tfh->fillvaddr = vaddr;
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tfh->pfn = pfn;
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tfh->dirty = dirty;
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tfh->pagesize = pagesize;
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tfh->opc = TFHOP_WRITE_ONLY;
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start_instruction(tfh);
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}
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void tfh_write_restart(struct gru_tlb_fault_handle *tfh,
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unsigned long paddr, int gaa,
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unsigned long vaddr, int asid, int dirty,
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int pagesize)
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{
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tfh->fillasid = asid;
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tfh->fillvaddr = vaddr;
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tfh->pfn = paddr >> GRU_PADDR_SHIFT;
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tfh->gaa = gaa;
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tfh->dirty = dirty;
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tfh->pagesize = pagesize;
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tfh->opc = TFHOP_WRITE_RESTART;
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start_instruction(tfh);
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}
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void tfh_restart(struct gru_tlb_fault_handle *tfh)
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{
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tfh->opc = TFHOP_RESTART;
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start_instruction(tfh);
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}
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void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh)
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{
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tfh->opc = TFHOP_USER_POLLING_MODE;
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start_instruction(tfh);
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}
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void tfh_exception(struct gru_tlb_fault_handle *tfh)
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{
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tfh->opc = TFHOP_EXCEPTION;
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start_instruction(tfh);
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}
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