![Jack Steiner](/assets/img/avatar_default.png)
Change the way GRU resources are assigned for kernel threads. GRU contexts for kernel threads are now allocated on demand and can be stolen by user processes when idle. This allows MPI jobs to use ALL of the GRU resources when the kernel is not using them. Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
175 lines
4.6 KiB
C
175 lines
4.6 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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unsigned long 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: start %ld, end %ld\n",
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h, start_time, (unsigned long)get_cycles());
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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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{
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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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