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/*
* Copyright (C) 2017 NVIDIA Corporation. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <nvgpu/types.h>
#include <nvgpu/xve.h>
#include <nvgpu/timers.h>
#include "debug_xve.h"
#include "os_linux.h"
#include <linux/debugfs.h>
#include <linux/uaccess.h>
static ssize_t xve_link_speed_write(struct file *filp,
const char __user *buff,
size_t len, loff_t *off)
{
struct gk20a *g = ((struct seq_file *)filp->private_data)->private;
char kbuff[16];
u32 buff_size, check_len;
u32 link_speed = 0;
int ret;
buff_size = min_t(size_t, 16, len);
memset(kbuff, 0, 16);
if (copy_from_user(kbuff, buff, buff_size))
return -EFAULT;
check_len = strlen("Gen1");
if (strncmp(kbuff, "Gen1", check_len) == 0)
link_speed = GPU_XVE_SPEED_2P5;
else if (strncmp(kbuff, "Gen2", check_len) == 0)
link_speed = GPU_XVE_SPEED_5P0;
else if (strncmp(kbuff, "Gen3", check_len) == 0)
link_speed = GPU_XVE_SPEED_8P0;
else
nvgpu_err(g, "%s: Unknown PCIe speed: %s",
__func__, kbuff);
if (!link_speed)
return -EINVAL;
/* Brief pause... To help rate limit this. */
nvgpu_msleep(250);
/*
* And actually set the speed. Yay.
*/
ret = g->ops.xve.set_speed(g, link_speed);
if (ret)
return ret;
return len;
}
static int xve_link_speed_show(struct seq_file *s, void *unused)
{
struct gk20a *g = s->private;
u32 speed;
int err;
err = g->ops.xve.get_speed(g, &speed);
if (err)
return err;
seq_printf(s, "Current PCIe speed:\n %s\n", xve_speed_to_str(speed));
return 0;
}
static int xve_link_speed_open(struct inode *inode, struct file *file)
{
return single_open(file, xve_link_speed_show, inode->i_private);
}
static const struct file_operations xve_link_speed_fops = {
.open = xve_link_speed_open,
.read = seq_read,
.write = xve_link_speed_write,
.llseek = seq_lseek,
.release = single_release,
};
static int xve_available_speeds_show(struct seq_file *s, void *unused)
{
struct gk20a *g = s->private;
u32 available_speeds;
g->ops.xve.available_speeds(g, &available_speeds);
seq_puts(s, "Available PCIe bus speeds:\n");
if (available_speeds & GPU_XVE_SPEED_2P5)
seq_puts(s, " Gen1\n");
if (available_speeds & GPU_XVE_SPEED_5P0)
seq_puts(s, " Gen2\n");
if (available_speeds & GPU_XVE_SPEED_8P0)
seq_puts(s, " Gen3\n");
return 0;
}
static int xve_available_speeds_open(struct inode *inode, struct file *file)
{
return single_open(file, xve_available_speeds_show, inode->i_private);
}
static const struct file_operations xve_available_speeds_fops = {
.open = xve_available_speeds_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int xve_link_control_status_show(struct seq_file *s, void *unused)
{
struct gk20a *g = s->private;
u32 link_status;
link_status = g->ops.xve.get_link_control_status(g);
seq_printf(s, "0x%08x\n", link_status);
return 0;
}
static int xve_link_control_status_open(struct inode *inode, struct file *file)
{
return single_open(file, xve_link_control_status_show, inode->i_private);
}
static const struct file_operations xve_link_control_status_fops = {
.open = xve_link_control_status_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
int nvgpu_xve_debugfs_init(struct gk20a *g)
{
int err = -ENODEV;
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
struct dentry *gpu_root = l->debugfs;
l->debugfs_xve = debugfs_create_dir("xve", gpu_root);
if (IS_ERR_OR_NULL(l->debugfs_xve))
goto fail;
/*
* These are just debug nodes. If they fail to get made it's not worth
* worrying the higher level SW.
*/
debugfs_create_file("link_speed", S_IRUGO,
l->debugfs_xve, g,
&xve_link_speed_fops);
debugfs_create_file("available_speeds", S_IRUGO,
l->debugfs_xve, g,
&xve_available_speeds_fops);
debugfs_create_file("link_control_status", S_IRUGO,
l->debugfs_xve, g,
&xve_link_control_status_fops);
err = 0;
fail:
return err;
}
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