GRU Driver: /proc interfaces

This file externalizes some GRU state & statistics to the user using the
/proc file system.

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>

1 files changed, 336 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/gruprocfs.c b/drivers/misc/sgi-gru/gruprocfs.c
new file mode 100644
index 000000000000..bdb1ad83bbfb
--- /dev/null
+++ b/drivers/misc/sgi-gru/gruprocfs.c
@@ -0,0 +1,336 @@
+/*
+ * SN Platform GRU Driver
+ *
+ *              PROC INTERFACES
+ *
+ * This file supports the /proc interfaces for the GRU driver
+ *
+ *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/proc_fs.h>
+#include <linux/device.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include "gru.h"
+#include "grulib.h"
+#include "grutables.h"
+
+#define printstat(s, f)         printstat_val(s, &gru_stats.f, #f)
+
+static void printstat_val(struct seq_file *s, atomic_long_t *v, char *id)
+{
+        unsigned long val = atomic_long_read(v);
+
+        if (val)
+                seq_printf(s, "%16lu %s\n", val, id);
+}
+
+static int statistics_show(struct seq_file *s, void *p)
+{
+        printstat(s, vdata_alloc);
+        printstat(s, vdata_free);
+        printstat(s, gts_alloc);
+        printstat(s, gts_free);
+        printstat(s, vdata_double_alloc);
+        printstat(s, gts_double_allocate);
+        printstat(s, assign_context);
+        printstat(s, assign_context_failed);
+        printstat(s, free_context);
+        printstat(s, load_context);
+        printstat(s, unload_context);
+        printstat(s, steal_context);
+        printstat(s, steal_context_failed);
+        printstat(s, nopfn);
+        printstat(s, break_cow);
+        printstat(s, asid_new);
+        printstat(s, asid_next);
+        printstat(s, asid_wrap);
+        printstat(s, asid_reuse);
+        printstat(s, intr);
+        printstat(s, call_os);
+        printstat(s, call_os_check_for_bug);
+        printstat(s, call_os_wait_queue);
+        printstat(s, user_flush_tlb);
+        printstat(s, user_unload_context);
+        printstat(s, user_exception);
+        printstat(s, set_task_slice);
+        printstat(s, migrate_check);
+        printstat(s, migrated_retarget);
+        printstat(s, migrated_unload);
+        printstat(s, migrated_unload_delay);
+        printstat(s, migrated_nopfn_retarget);
+        printstat(s, migrated_nopfn_unload);
+        printstat(s, tlb_dropin);
+        printstat(s, tlb_dropin_fail_no_asid);
+        printstat(s, tlb_dropin_fail_upm);
+        printstat(s, tlb_dropin_fail_invalid);
+        printstat(s, tlb_dropin_fail_range_active);
+        printstat(s, tlb_dropin_fail_idle);
+        printstat(s, tlb_dropin_fail_fmm);
+        printstat(s, mmu_invalidate_range);
+        printstat(s, mmu_invalidate_page);
+        printstat(s, mmu_clear_flush_young);
+        printstat(s, flush_tlb);
+        printstat(s, flush_tlb_gru);
+        printstat(s, flush_tlb_gru_tgh);
+        printstat(s, flush_tlb_gru_zero_asid);
+        printstat(s, copy_gpa);
+        printstat(s, mesq_receive);
+        printstat(s, mesq_receive_none);
+        printstat(s, mesq_send);
+        printstat(s, mesq_send_failed);
+        printstat(s, mesq_noop);
+        printstat(s, mesq_send_unexpected_error);
+        printstat(s, mesq_send_lb_overflow);
+        printstat(s, mesq_send_qlimit_reached);
+        printstat(s, mesq_send_amo_nacked);
+        printstat(s, mesq_send_put_nacked);
+        printstat(s, mesq_qf_not_full);
+        printstat(s, mesq_qf_locked);
+        printstat(s, mesq_qf_noop_not_full);
+        printstat(s, mesq_qf_switch_head_failed);
+        printstat(s, mesq_qf_unexpected_error);
+        printstat(s, mesq_noop_unexpected_error);
+        printstat(s, mesq_noop_lb_overflow);
+        printstat(s, mesq_noop_qlimit_reached);
+        printstat(s, mesq_noop_amo_nacked);
+        printstat(s, mesq_noop_put_nacked);
+        return 0;
+}
+
+static ssize_t statistics_write(struct file *file, const char __user *userbuf,
+                                size_t count, loff_t *data)
+{
+        memset(&gru_stats, 0, sizeof(gru_stats));
+        return count;
+}
+
+static int options_show(struct seq_file *s, void *p)
+{
+        seq_printf(s, "0x%lx\n", options);
+        return 0;
+}
+
+static ssize_t options_write(struct file *file, const char __user *userbuf,
+                             size_t count, loff_t *data)
+{
+        unsigned long val;
+        char buf[80];
+
+        if (copy_from_user
+            (buf, userbuf, count < sizeof(buf) ? count : sizeof(buf)))
+                return -EFAULT;
+        if (!strict_strtoul(buf, 10, &val))
+                options = val;
+
+        return count;
+}
+
+static int cch_seq_show(struct seq_file *file, void *data)
+{
+        long gid = *(long *)data;
+        int i;
+        struct gru_state *gru = GID_TO_GRU(gid);
+        struct gru_thread_state *ts;
+        const char *mode[] = { "??", "UPM", "INTR", "OS_POLL" };
+
+        if (gid == 0)
+                seq_printf(file, "#%5s%5s%6s%9s%6s%8s%8s\n", "gid", "bid",
+                           "ctx#", "pid", "cbrs", "dsbytes", "mode");
+        if (gru)
+                for (i = 0; i < GRU_NUM_CCH; i++) {
+                        ts = gru->gs_gts[i];
+                        if (!ts)
+                                continue;
+                        seq_printf(file, " %5d%5d%6d%9d%6d%8d%8s\n",
+                                   gru->gs_gid, gru->gs_blade_id, i,
+                                   ts->ts_tgid_owner,
+                                   ts->ts_cbr_au_count * GRU_CBR_AU_SIZE,
+                                   ts->ts_cbr_au_count * GRU_DSR_AU_BYTES,
+                                   mode[ts->ts_user_options &
+                                        GRU_OPT_MISS_MASK]);
+                }
+
+        return 0;
+}
+
+static int gru_seq_show(struct seq_file *file, void *data)
+{
+        long gid = *(long *)data, ctxfree, cbrfree, dsrfree;
+        struct gru_state *gru = GID_TO_GRU(gid);
+
+        if (gid == 0) {
+                seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "gid", "nid",
+                           "ctx", "cbr", "dsr", "ctx", "cbr", "dsr");
+                seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "", "", "busy",
+                           "busy", "busy", "free", "free", "free");
+        }
+        if (gru) {
+                ctxfree = GRU_NUM_CCH - gru->gs_active_contexts;
+                cbrfree = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
+                dsrfree = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
+                seq_printf(file, " %5d%5d%7ld%6ld%6ld%8ld%6ld%6ld\n",
+                           gru->gs_gid, gru->gs_blade_id, GRU_NUM_CCH - ctxfree,
+                           GRU_NUM_CBE - cbrfree, GRU_NUM_DSR_BYTES - dsrfree,
+                           ctxfree, cbrfree, dsrfree);
+        }
+
+        return 0;
+}
+
+static void seq_stop(struct seq_file *file, void *data)
+{
+}
+
+static void *seq_start(struct seq_file *file, loff_t *gid)
+{
+        if (*gid < GRU_MAX_GRUS)
+                return gid;
+        return NULL;
+}
+
+static void *seq_next(struct seq_file *file, void *data, loff_t *gid)
+{
+        (*gid)++;
+        if (*gid < GRU_MAX_GRUS)
+                return gid;
+        return NULL;
+}
+
+static const struct seq_operations cch_seq_ops = {
+        .start  = seq_start,
+        .next   = seq_next,
+        .stop   = seq_stop,
+        .show   = cch_seq_show
+};
+
+static const struct seq_operations gru_seq_ops = {
+        .start  = seq_start,
+        .next   = seq_next,
+        .stop   = seq_stop,
+        .show   = gru_seq_show
+};
+
+static int statistics_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, statistics_show, NULL);
+}
+
+static int options_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, options_show, NULL);
+}
+
+static int cch_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &cch_seq_ops);
+}
+
+static int gru_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &gru_seq_ops);
+}
+
+/* *INDENT-OFF* */
+static const struct file_operations statistics_fops = {
+        .open           = statistics_open,
+        .read           = seq_read,
+        .write          = statistics_write,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static const struct file_operations options_fops = {
+        .open           = options_open,
+        .read           = seq_read,
+        .write          = options_write,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static const struct file_operations cch_fops = {
+        .open           = cch_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+static const struct file_operations gru_fops = {
+        .open           = gru_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+
+static struct proc_entry {
+        char *name;
+        int mode;
+        const struct file_operations *fops;
+        struct proc_dir_entry *entry;
+} proc_files[] = {
+        {"statistics", 0644, &statistics_fops},
+        {"debug_options", 0644, &options_fops},
+        {"cch_status", 0444, &cch_fops},
+        {"gru_status", 0444, &gru_fops},
+        {NULL}
+};
+/* *INDENT-ON* */
+
+static struct proc_dir_entry *proc_gru __read_mostly;
+
+static int create_proc_file(struct proc_entry *p)
+{
+        p->entry = create_proc_entry(p->name, p->mode, proc_gru);
+        if (!p->entry)
+                return -1;
+        p->entry->proc_fops = p->fops;
+        return 0;
+}
+
+static void delete_proc_files(void)
+{
+        struct proc_entry *p;
+
+        if (proc_gru) {
+                for (p = proc_files; p->name; p++)
+                        if (p->entry)
+                                remove_proc_entry(p->name, proc_gru);
+                remove_proc_entry("gru", NULL);
+        }
+}
+
+int gru_proc_init(void)
+{
+        struct proc_entry *p;
+
+        proc_mkdir("sgi_uv", NULL);
+        proc_gru = proc_mkdir("sgi_uv/gru", NULL);
+
+        for (p = proc_files; p->name; p++)
+                if (create_proc_file(p))
+                        goto err;
+        return 0;
+
+err:
+        delete_proc_files();
+        return -1;
+}
+
+void gru_proc_exit(void)
+{
+        delete_proc_files();
+}