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         unsigned long 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: start %ld, end %ld\n",
  69                               h, start_time, (unsigned long)get_cycles());
  70         }
  71         if (gru_options & OPT_STATS)
  72                 update_mcs_stats(opc, get_cycles() - start_time);
  73         return status;
  74 }
  75
  76 int cch_allocate(struct gru_context_configuration_handle *cch)
  77 {
  78         cch->opc = CCHOP_ALLOCATE;
  79         start_instruction(cch);
  80         return wait_instruction_complete(cch, cchop_allocate);
  81 }
  82
  83 int cch_start(struct gru_context_configuration_handle *cch)
  84 {
  85         cch->opc = CCHOP_START;
  86         start_instruction(cch);
  87         return wait_instruction_complete(cch, cchop_start);
  88 }
  89
  90 int cch_interrupt(struct gru_context_configuration_handle *cch)
  91 {
  92         cch->opc = CCHOP_INTERRUPT;
  93         start_instruction(cch);
  94         return wait_instruction_complete(cch, cchop_interrupt);
  95 }
  96
  97 int cch_deallocate(struct gru_context_configuration_handle *cch)
  98 {
  99         cch->opc = CCHOP_DEALLOCATE;
 100         start_instruction(cch);
 101         return wait_instruction_complete(cch, cchop_deallocate);
 102 }
 103
 104 int cch_interrupt_sync(struct gru_context_configuration_handle
 105                                      *cch)
 106 {
 107         cch->opc = CCHOP_INTERRUPT_SYNC;
 108         start_instruction(cch);
 109         return wait_instruction_complete(cch, cchop_interrupt_sync);
 110 }
 111
 112 int tgh_invalidate(struct gru_tlb_global_handle *tgh,
 113                                  unsigned long vaddr, unsigned long vaddrmask,
 114                                  int asid, int pagesize, int global, int n,
 115                                  unsigned short ctxbitmap)
 116 {
 117         tgh->vaddr = vaddr;
 118         tgh->asid = asid;
 119         tgh->pagesize = pagesize;
 120         tgh->n = n;
 121         tgh->global = global;
 122         tgh->vaddrmask = vaddrmask;
 123         tgh->ctxbitmap = ctxbitmap;
 124         tgh->opc = TGHOP_TLBINV;
 125         start_instruction(tgh);
 126         return wait_instruction_complete(tgh, tghop_invalidate);
 127 }
 128
 129 void tfh_write_only(struct gru_tlb_fault_handle *tfh,
 130                                   unsigned long pfn, unsigned long vaddr,
 131                                   int asid, int dirty, int pagesize)
 132 {
 133         tfh->fillasid = asid;
 134         tfh->fillvaddr = vaddr;
 135         tfh->pfn = pfn;
 136         tfh->dirty = dirty;
 137         tfh->pagesize = pagesize;
 138         tfh->opc = TFHOP_WRITE_ONLY;
 139         start_instruction(tfh);
 140 }
 141
 142 void tfh_write_restart(struct gru_tlb_fault_handle *tfh,
 143                                      unsigned long paddr, int gaa,
 144                                      unsigned long vaddr, int asid, int dirty,
 145                                      int pagesize)
 146 {
 147         tfh->fillasid = asid;
 148         tfh->fillvaddr = vaddr;
 149         tfh->pfn = paddr >> GRU_PADDR_SHIFT;
 150         tfh->gaa = gaa;
 151         tfh->dirty = dirty;
 152         tfh->pagesize = pagesize;
 153         tfh->opc = TFHOP_WRITE_RESTART;
 154         start_instruction(tfh);
 155 }
 156
 157 void tfh_restart(struct gru_tlb_fault_handle *tfh)
 158 {
 159         tfh->opc = TFHOP_RESTART;
 160         start_instruction(tfh);
 161 }
 162
 163 void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh)
 164 {
 165         tfh->opc = TFHOP_USER_POLLING_MODE;
 166         start_instruction(tfh);
 167 }
 168
 169 void tfh_exception(struct gru_tlb_fault_handle *tfh)
 170 {
 171         tfh->opc = TFHOP_EXCEPTION;
 172         start_instruction(tfh);
 173 }
 174