drivers/misc/sgi-gru/gruhandles.c

   1 /*
   2  *              GRU KERNEL MCS INSTRUCTIONS
   3  *
   4  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include "gru.h"
  23 #include "grulib.h"
  24 #include "grutables.h"
  25
  26 /* 10 sec */
  27 #ifdef CONFIG_IA64
  28 #include <asm/processor.h>
  29 #define GRU_OPERATION_TIMEOUT   (((cycles_t) local_cpu_data->itc_freq)*10)
  30 #else
  31 #include <asm/tsc.h>
  32 #define GRU_OPERATION_TIMEOUT   ((cycles_t) tsc_khz*10*1000)
  33 #endif
  34
  35 /* Extract the status field from a kernel handle */
  36 #define GET_MSEG_HANDLE_STATUS(h)       (((*(unsigned long *)(h)) >> 16) & 3)
  37
  38 struct mcs_op_statistic mcs_op_statistics[mcsop_last];
  39
  40 static void update_mcs_stats(enum mcs_op op, unsigned long clks)
  41 {
  42         atomic_long_inc(&mcs_op_statistics[op].count);
  43         atomic_long_add(clks, &mcs_op_statistics[op].total);
  44         if (mcs_op_statistics[op].max < clks)
  45                 mcs_op_statistics[op].max = clks;
  46 }
  47
  48 static void start_instruction(void *h)
  49 {
  50         unsigned long *w0 = h;
  51
  52         wmb();          /* setting CMD bit must be last */
  53         *w0 = *w0 | 1;
  54         gru_flush_cache(h);
  55 }
  56
  57 static int wait_instruction_complete(void *h, enum mcs_op opc)
  58 {
  59         int status;
  60         cycles_t start_time = get_cycles();
  61
  62         while (1) {
  63                 cpu_relax();
  64                 status = GET_MSEG_HANDLE_STATUS(h);
  65                 if (status != CCHSTATUS_ACTIVE)
  66                         break;
  67                 if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time))
  68                         panic("GRU %p is malfunctioning\n", h);
  69         }
  70         if (gru_options & OPT_STATS)
  71                 update_mcs_stats(opc, get_cycles() - start_time);
  72         return status;
  73 }
  74
  75 int cch_allocate(struct gru_context_configuration_handle *cch)
  76 {
  77         cch->opc = CCHOP_ALLOCATE;
  78         start_instruction(cch);
  79         return wait_instruction_complete(cch, cchop_allocate);
  80 }
  81
  82 int cch_start(struct gru_context_configuration_handle *cch)
  83 {
  84         cch->opc = CCHOP_START;
  85         start_instruction(cch);
  86         return wait_instruction_complete(cch, cchop_start);
  87 }
  88
  89 int cch_interrupt(struct gru_context_configuration_handle *cch)
  90 {
  91         cch->opc = CCHOP_INTERRUPT;
  92         start_instruction(cch);
  93         return wait_instruction_complete(cch, cchop_interrupt);
  94 }
  95
  96 int cch_deallocate(struct gru_context_configuration_handle *cch)
  97 {
  98         cch->opc = CCHOP_DEALLOCATE;
  99         start_instruction(cch);
 100         return wait_instruction_complete(cch, cchop_deallocate);
 101 }
 102
 103 int cch_interrupt_sync(struct gru_context_configuration_handle
 104                                      *cch)
 105 {
 106         cch->opc = CCHOP_INTERRUPT_SYNC;
 107         start_instruction(cch);
 108         return wait_instruction_complete(cch, cchop_interrupt_sync);
 109 }
 110
 111 int tgh_invalidate(struct gru_tlb_global_handle *tgh,
 112                                  unsigned long vaddr, unsigned long vaddrmask,
 113                                  int asid, int pagesize, int global, int n,
 114                                  unsigned short ctxbitmap)
 115 {
 116         tgh->vaddr = vaddr;
 117         tgh->asid = asid;
 118         tgh->pagesize = pagesize;
 119         tgh->n = n;
 120         tgh->global = global;
 121         tgh->vaddrmask = vaddrmask;
 122         tgh->ctxbitmap = ctxbitmap;
 123         tgh->opc = TGHOP_TLBINV;
 124         start_instruction(tgh);
 125         return wait_instruction_complete(tgh, tghop_invalidate);
 126 }
 127
 128 void tfh_write_only(struct gru_tlb_fault_handle *tfh,
 129                                   unsigned long pfn, unsigned long vaddr,
 130                                   int asid, int dirty, int pagesize)
 131 {
 132         tfh->fillasid = asid;
 133         tfh->fillvaddr = vaddr;
 134         tfh->pfn = pfn;
 135         tfh->dirty = dirty;
 136         tfh->pagesize = pagesize;
 137         tfh->opc = TFHOP_WRITE_ONLY;
 138         start_instruction(tfh);
 139 }
 140
 141 void tfh_write_restart(struct gru_tlb_fault_handle *tfh,
 142                                      unsigned long paddr, int gaa,
 143                                      unsigned long vaddr, int asid, int dirty,
 144                                      int pagesize)
 145 {
 146         tfh->fillasid = asid;
 147         tfh->fillvaddr = vaddr;
 148         tfh->pfn = paddr >> GRU_PADDR_SHIFT;
 149         tfh->gaa = gaa;
 150         tfh->dirty = dirty;
 151         tfh->pagesize = pagesize;
 152         tfh->opc = TFHOP_WRITE_RESTART;
 153         start_instruction(tfh);
 154 }
 155
 156 void tfh_restart(struct gru_tlb_fault_handle *tfh)
 157 {
 158         tfh->opc = TFHOP_RESTART;
 159         start_instruction(tfh);
 160 }
 161
 162 void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh)
 163 {
 164         tfh->opc = TFHOP_USER_POLLING_MODE;
 165         start_instruction(tfh);
 166 }
 167
 168 void tfh_exception(struct gru_tlb_fault_handle *tfh)
 169 {
 170         tfh->opc = TFHOP_EXCEPTION;
 171         start_instruction(tfh);
 172 }
 173