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2ce4d4c937
Fix a race where an interrupt could be received for a GRU context that has been deallocated. 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>
382 lines
9.9 KiB
C
382 lines
9.9 KiB
C
/*
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* SN Platform GRU Driver
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*
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* PROC INTERFACES
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*
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* This file supports the /proc interfaces for the GRU driver
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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/proc_fs.h>
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#include <linux/device.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.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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#define printstat(s, f) printstat_val(s, &gru_stats.f, #f)
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static void printstat_val(struct seq_file *s, atomic_long_t *v, char *id)
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{
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unsigned long val = atomic_long_read(v);
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seq_printf(s, "%16lu %s\n", val, id);
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}
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static int statistics_show(struct seq_file *s, void *p)
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{
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printstat(s, vdata_alloc);
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printstat(s, vdata_free);
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printstat(s, gts_alloc);
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printstat(s, gts_free);
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printstat(s, gms_alloc);
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printstat(s, gms_free);
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printstat(s, gts_double_allocate);
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printstat(s, assign_context);
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printstat(s, assign_context_failed);
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printstat(s, free_context);
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printstat(s, load_user_context);
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printstat(s, load_kernel_context);
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printstat(s, lock_kernel_context);
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printstat(s, unlock_kernel_context);
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printstat(s, steal_user_context);
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printstat(s, steal_kernel_context);
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printstat(s, steal_context_failed);
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printstat(s, nopfn);
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printstat(s, asid_new);
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printstat(s, asid_next);
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printstat(s, asid_wrap);
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printstat(s, asid_reuse);
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printstat(s, intr);
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printstat(s, intr_cbr);
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printstat(s, intr_tfh);
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printstat(s, intr_spurious);
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printstat(s, intr_mm_lock_failed);
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printstat(s, call_os);
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printstat(s, call_os_wait_queue);
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printstat(s, user_flush_tlb);
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printstat(s, user_unload_context);
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printstat(s, user_exception);
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printstat(s, set_context_option);
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printstat(s, check_context_retarget_intr);
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printstat(s, check_context_unload);
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printstat(s, tlb_dropin);
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printstat(s, tlb_preload_page);
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printstat(s, tlb_dropin_fail_no_asid);
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printstat(s, tlb_dropin_fail_upm);
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printstat(s, tlb_dropin_fail_invalid);
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printstat(s, tlb_dropin_fail_range_active);
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printstat(s, tlb_dropin_fail_idle);
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printstat(s, tlb_dropin_fail_fmm);
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printstat(s, tlb_dropin_fail_no_exception);
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printstat(s, tfh_stale_on_fault);
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printstat(s, mmu_invalidate_range);
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printstat(s, mmu_invalidate_page);
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printstat(s, flush_tlb);
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printstat(s, flush_tlb_gru);
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printstat(s, flush_tlb_gru_tgh);
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printstat(s, flush_tlb_gru_zero_asid);
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printstat(s, copy_gpa);
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printstat(s, read_gpa);
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printstat(s, mesq_receive);
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printstat(s, mesq_receive_none);
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printstat(s, mesq_send);
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printstat(s, mesq_send_failed);
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printstat(s, mesq_noop);
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printstat(s, mesq_send_unexpected_error);
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printstat(s, mesq_send_lb_overflow);
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printstat(s, mesq_send_qlimit_reached);
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printstat(s, mesq_send_amo_nacked);
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printstat(s, mesq_send_put_nacked);
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printstat(s, mesq_qf_locked);
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printstat(s, mesq_qf_noop_not_full);
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printstat(s, mesq_qf_switch_head_failed);
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printstat(s, mesq_qf_unexpected_error);
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printstat(s, mesq_noop_unexpected_error);
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printstat(s, mesq_noop_lb_overflow);
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printstat(s, mesq_noop_qlimit_reached);
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printstat(s, mesq_noop_amo_nacked);
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printstat(s, mesq_noop_put_nacked);
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printstat(s, mesq_noop_page_overflow);
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return 0;
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}
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static ssize_t statistics_write(struct file *file, const char __user *userbuf,
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size_t count, loff_t *data)
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{
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memset(&gru_stats, 0, sizeof(gru_stats));
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return count;
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}
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static int mcs_statistics_show(struct seq_file *s, void *p)
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{
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int op;
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unsigned long total, count, max;
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static char *id[] = {"cch_allocate", "cch_start", "cch_interrupt",
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"cch_interrupt_sync", "cch_deallocate", "tfh_write_only",
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"tfh_write_restart", "tgh_invalidate"};
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seq_printf(s, "%-20s%12s%12s%12s\n", "#id", "count", "aver-clks", "max-clks");
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for (op = 0; op < mcsop_last; op++) {
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count = atomic_long_read(&mcs_op_statistics[op].count);
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total = atomic_long_read(&mcs_op_statistics[op].total);
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max = mcs_op_statistics[op].max;
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seq_printf(s, "%-20s%12ld%12ld%12ld\n", id[op], count,
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count ? total / count : 0, max);
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}
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return 0;
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}
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static ssize_t mcs_statistics_write(struct file *file,
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const char __user *userbuf, size_t count, loff_t *data)
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{
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memset(mcs_op_statistics, 0, sizeof(mcs_op_statistics));
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return count;
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}
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static int options_show(struct seq_file *s, void *p)
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{
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seq_printf(s, "#bitmask: 1=trace, 2=statistics\n");
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seq_printf(s, "0x%lx\n", gru_options);
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return 0;
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}
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static ssize_t options_write(struct file *file, const char __user *userbuf,
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size_t count, loff_t *data)
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{
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char buf[20];
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if (count >= sizeof(buf))
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return -EINVAL;
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if (copy_from_user(buf, userbuf, count))
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return -EFAULT;
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buf[count] = '\0';
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if (strict_strtoul(buf, 0, &gru_options))
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return -EINVAL;
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return count;
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}
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static int cch_seq_show(struct seq_file *file, void *data)
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{
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long gid = *(long *)data;
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int i;
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struct gru_state *gru = GID_TO_GRU(gid);
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struct gru_thread_state *ts;
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const char *mode[] = { "??", "UPM", "INTR", "OS_POLL" };
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if (gid == 0)
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seq_printf(file, "#%5s%5s%6s%7s%9s%6s%8s%8s\n", "gid", "bid",
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"ctx#", "asid", "pid", "cbrs", "dsbytes", "mode");
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if (gru)
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for (i = 0; i < GRU_NUM_CCH; i++) {
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ts = gru->gs_gts[i];
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if (!ts)
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continue;
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seq_printf(file, " %5d%5d%6d%7d%9d%6d%8d%8s\n",
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gru->gs_gid, gru->gs_blade_id, i,
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is_kernel_context(ts) ? 0 : ts->ts_gms->ms_asids[gid].mt_asid,
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is_kernel_context(ts) ? 0 : ts->ts_tgid_owner,
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ts->ts_cbr_au_count * GRU_CBR_AU_SIZE,
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ts->ts_cbr_au_count * GRU_DSR_AU_BYTES,
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mode[ts->ts_user_options &
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GRU_OPT_MISS_MASK]);
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}
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return 0;
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}
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static int gru_seq_show(struct seq_file *file, void *data)
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{
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long gid = *(long *)data, ctxfree, cbrfree, dsrfree;
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struct gru_state *gru = GID_TO_GRU(gid);
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if (gid == 0) {
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seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "gid", "nid",
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"ctx", "cbr", "dsr", "ctx", "cbr", "dsr");
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seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "", "", "busy",
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"busy", "busy", "free", "free", "free");
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}
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if (gru) {
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ctxfree = GRU_NUM_CCH - gru->gs_active_contexts;
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cbrfree = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
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dsrfree = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
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seq_printf(file, " %5d%5d%7ld%6ld%6ld%8ld%6ld%6ld\n",
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gru->gs_gid, gru->gs_blade_id, GRU_NUM_CCH - ctxfree,
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GRU_NUM_CBE - cbrfree, GRU_NUM_DSR_BYTES - dsrfree,
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ctxfree, cbrfree, dsrfree);
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}
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return 0;
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}
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static void seq_stop(struct seq_file *file, void *data)
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{
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}
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static void *seq_start(struct seq_file *file, loff_t *gid)
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{
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if (*gid < gru_max_gids)
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return gid;
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return NULL;
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}
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static void *seq_next(struct seq_file *file, void *data, loff_t *gid)
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{
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(*gid)++;
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if (*gid < gru_max_gids)
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return gid;
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return NULL;
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}
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static const struct seq_operations cch_seq_ops = {
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.start = seq_start,
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.next = seq_next,
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.stop = seq_stop,
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.show = cch_seq_show
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};
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static const struct seq_operations gru_seq_ops = {
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.start = seq_start,
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.next = seq_next,
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.stop = seq_stop,
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.show = gru_seq_show
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};
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static int statistics_open(struct inode *inode, struct file *file)
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{
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return single_open(file, statistics_show, NULL);
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}
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static int mcs_statistics_open(struct inode *inode, struct file *file)
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{
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return single_open(file, mcs_statistics_show, NULL);
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}
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static int options_open(struct inode *inode, struct file *file)
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{
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return single_open(file, options_show, NULL);
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}
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static int cch_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &cch_seq_ops);
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}
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static int gru_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &gru_seq_ops);
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}
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/* *INDENT-OFF* */
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static const struct file_operations statistics_fops = {
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.open = statistics_open,
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.read = seq_read,
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.write = statistics_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static const struct file_operations mcs_statistics_fops = {
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.open = mcs_statistics_open,
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.read = seq_read,
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.write = mcs_statistics_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static const struct file_operations options_fops = {
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.open = options_open,
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.read = seq_read,
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.write = options_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static const struct file_operations cch_fops = {
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.open = cch_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static const struct file_operations gru_fops = {
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.open = gru_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static struct proc_entry {
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char *name;
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int mode;
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const struct file_operations *fops;
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struct proc_dir_entry *entry;
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} proc_files[] = {
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{"statistics", 0644, &statistics_fops},
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{"mcs_statistics", 0644, &mcs_statistics_fops},
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{"debug_options", 0644, &options_fops},
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{"cch_status", 0444, &cch_fops},
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{"gru_status", 0444, &gru_fops},
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{NULL}
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};
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/* *INDENT-ON* */
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static struct proc_dir_entry *proc_gru __read_mostly;
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static int create_proc_file(struct proc_entry *p)
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{
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p->entry = proc_create(p->name, p->mode, proc_gru, p->fops);
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if (!p->entry)
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return -1;
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return 0;
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}
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static void delete_proc_files(void)
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{
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struct proc_entry *p;
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if (proc_gru) {
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for (p = proc_files; p->name; p++)
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if (p->entry)
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remove_proc_entry(p->name, proc_gru);
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remove_proc_entry("gru", proc_gru->parent);
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}
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}
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int gru_proc_init(void)
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{
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struct proc_entry *p;
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proc_gru = proc_mkdir("sgi_uv/gru", NULL);
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for (p = proc_files; p->name; p++)
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if (create_proc_file(p))
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goto err;
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return 0;
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err:
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delete_proc_files();
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return -1;
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}
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void gru_proc_exit(void)
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{
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delete_proc_files();
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}
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