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>

drivers/misc/sgi-gru/gruprocfs.c

+/*
+ * 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();
+}