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linux-sg2042/drivers/ntb/test/ntb_tool.c

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/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright (C) 2015 EMC Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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.
*
* BSD LICENSE
*
* Copyright (C) 2015 EMC Corporation. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copy
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* PCIe NTB Debugging Tool Linux driver
*
* Contact Information:
* Allen Hubbe <Allen.Hubbe@emc.com>
*/
/*
* How to use this tool, by example.
*
* Assuming $DBG_DIR is something like:
* '/sys/kernel/debug/ntb_tool/0000:00:03.0'
*
* Eg: check if clearing the doorbell mask generates an interrupt.
*
* # Check the link status
* root@self# cat $DBG_DIR/link
*
* # Block until the link is up
* root@self# echo Y > $DBG_DIR/link_event
*
* # Set the doorbell mask
* root@self# echo 's 1' > $DBG_DIR/mask
*
* # Ring the doorbell from the peer
* root@peer# echo 's 1' > $DBG_DIR/peer_db
*
* # Clear the doorbell mask
* root@self# echo 'c 1' > $DBG_DIR/mask
*
* Observe debugging output in dmesg or your console. You should see a
* doorbell event triggered by clearing the mask. If not, this may indicate an
* issue with the hardware that needs to be worked around in the driver.
*
* Eg: read and write scratchpad registers
*
* root@peer# echo '0 0x01010101 1 0x7f7f7f7f' > $DBG_DIR/peer_spad
*
* root@self# cat $DBG_DIR/spad
*
* Observe that spad 0 and 1 have the values set by the peer.
*
* # Check the memory window translation info
* cat $DBG_DIR/peer_trans0
*
* # Setup a 16k memory window buffer
* echo 16384 > $DBG_DIR/peer_trans0
*
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/ntb.h>
#define DRIVER_NAME "ntb_tool"
#define DRIVER_DESCRIPTION "PCIe NTB Debugging Tool"
#define DRIVER_LICENSE "Dual BSD/GPL"
#define DRIVER_VERSION "1.0"
#define DRIVER_RELDATE "22 April 2015"
#define DRIVER_AUTHOR "Allen Hubbe <Allen.Hubbe@emc.com>"
MODULE_LICENSE(DRIVER_LICENSE);
MODULE_VERSION(DRIVER_VERSION);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
#define MAX_MWS 16
static struct dentry *tool_dbgfs;
struct tool_mw {
int idx;
struct tool_ctx *tc;
resource_size_t win_size;
resource_size_t size;
u8 __iomem *local;
u8 *peer;
dma_addr_t peer_dma;
struct dentry *peer_dbg_file;
};
struct tool_ctx {
struct ntb_dev *ntb;
struct dentry *dbgfs;
wait_queue_head_t link_wq;
int mw_count;
struct tool_mw mws[MAX_MWS];
};
#define SPAD_FNAME_SIZE 0x10
#define INT_PTR(x) ((void *)(unsigned long)x)
#define PTR_INT(x) ((int)(unsigned long)x)
#define TOOL_FOPS_RDWR(__name, __read, __write) \
const struct file_operations __name = { \
.owner = THIS_MODULE, \
.open = simple_open, \
.read = __read, \
.write = __write, \
}
static void tool_link_event(void *ctx)
{
struct tool_ctx *tc = ctx;
enum ntb_speed speed;
enum ntb_width width;
int up;
up = ntb_link_is_up(tc->ntb, &speed, &width);
dev_dbg(&tc->ntb->dev, "link is %s speed %d width %d\n",
up ? "up" : "down", speed, width);
wake_up(&tc->link_wq);
}
static void tool_db_event(void *ctx, int vec)
{
struct tool_ctx *tc = ctx;
u64 db_bits, db_mask;
db_mask = ntb_db_vector_mask(tc->ntb, vec);
db_bits = ntb_db_read(tc->ntb);
dev_dbg(&tc->ntb->dev, "doorbell vec %d mask %#llx bits %#llx\n",
vec, db_mask, db_bits);
}
static const struct ntb_ctx_ops tool_ops = {
.link_event = tool_link_event,
.db_event = tool_db_event,
};
static ssize_t tool_dbfn_read(struct tool_ctx *tc, char __user *ubuf,
size_t size, loff_t *offp,
u64 (*db_read_fn)(struct ntb_dev *))
{
size_t buf_size;
char *buf;
ssize_t pos, rc;
if (!db_read_fn)
return -EINVAL;
buf_size = min_t(size_t, size, 0x20);
buf = kmalloc(buf_size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
pos = scnprintf(buf, buf_size, "%#llx\n",
db_read_fn(tc->ntb));
rc = simple_read_from_buffer(ubuf, size, offp, buf, pos);
kfree(buf);
return rc;
}
static ssize_t tool_dbfn_write(struct tool_ctx *tc,
const char __user *ubuf,
size_t size, loff_t *offp,
int (*db_set_fn)(struct ntb_dev *, u64),
int (*db_clear_fn)(struct ntb_dev *, u64))
{
u64 db_bits;
char *buf, cmd;
ssize_t rc;
int n;
buf = kmalloc(size + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
rc = simple_write_to_buffer(buf, size, offp, ubuf, size);
if (rc < 0) {
kfree(buf);
return rc;
}
buf[size] = 0;
n = sscanf(buf, "%c %lli", &cmd, &db_bits);
kfree(buf);
if (n != 2) {
rc = -EINVAL;
} else if (cmd == 's') {
if (!db_set_fn)
rc = -EINVAL;
else
rc = db_set_fn(tc->ntb, db_bits);
} else if (cmd == 'c') {
if (!db_clear_fn)
rc = -EINVAL;
else
rc = db_clear_fn(tc->ntb, db_bits);
} else {
rc = -EINVAL;
}
return rc ? : size;
}
static ssize_t tool_spadfn_read(struct tool_ctx *tc, char __user *ubuf,
size_t size, loff_t *offp,
u32 (*spad_read_fn)(struct ntb_dev *, int))
{
size_t buf_size;
char *buf;
ssize_t pos, rc;
int i, spad_count;
if (!spad_read_fn)
return -EINVAL;
spad_count = ntb_spad_count(tc->ntb);
/*
* We multiply the number of spads by 15 to get the buffer size
* this is from 3 for the %d, 10 for the largest hex value
* (0x00000000) and 2 for the tab and line feed.
*/
buf_size = min_t(size_t, size, spad_count * 15);
buf = kmalloc(buf_size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
pos = 0;
for (i = 0; i < spad_count; ++i) {
pos += scnprintf(buf + pos, buf_size - pos, "%d\t%#x\n",
i, spad_read_fn(tc->ntb, i));
}
rc = simple_read_from_buffer(ubuf, size, offp, buf, pos);
kfree(buf);
return rc;
}
static ssize_t tool_spadfn_write(struct tool_ctx *tc,
const char __user *ubuf,
size_t size, loff_t *offp,
int (*spad_write_fn)(struct ntb_dev *,
int, u32))
{
int spad_idx;
u32 spad_val;
char *buf, *buf_ptr;
int pos, n;
ssize_t rc;
if (!spad_write_fn) {
dev_dbg(&tc->ntb->dev, "no spad write fn\n");
return -EINVAL;
}
buf = kmalloc(size + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
rc = simple_write_to_buffer(buf, size, offp, ubuf, size);
if (rc < 0) {
kfree(buf);
return rc;
}
buf[size] = 0;
buf_ptr = buf;
n = sscanf(buf_ptr, "%d %i%n", &spad_idx, &spad_val, &pos);
while (n == 2) {
buf_ptr += pos;
rc = spad_write_fn(tc->ntb, spad_idx, spad_val);
if (rc)
break;
n = sscanf(buf_ptr, "%d %i%n", &spad_idx, &spad_val, &pos);
}
if (n < 0)
rc = n;
kfree(buf);
return rc ? : size;
}
static ssize_t tool_db_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_dbfn_read(tc, ubuf, size, offp,
tc->ntb->ops->db_read);
}
static ssize_t tool_db_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_dbfn_write(tc, ubuf, size, offp,
tc->ntb->ops->db_set,
tc->ntb->ops->db_clear);
}
static TOOL_FOPS_RDWR(tool_db_fops,
tool_db_read,
tool_db_write);
static ssize_t tool_mask_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_dbfn_read(tc, ubuf, size, offp,
tc->ntb->ops->db_read_mask);
}
static ssize_t tool_mask_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_dbfn_write(tc, ubuf, size, offp,
tc->ntb->ops->db_set_mask,
tc->ntb->ops->db_clear_mask);
}
static TOOL_FOPS_RDWR(tool_mask_fops,
tool_mask_read,
tool_mask_write);
static ssize_t tool_peer_db_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_dbfn_read(tc, ubuf, size, offp,
tc->ntb->ops->peer_db_read);
}
static ssize_t tool_peer_db_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_dbfn_write(tc, ubuf, size, offp,
tc->ntb->ops->peer_db_set,
tc->ntb->ops->peer_db_clear);
}
static TOOL_FOPS_RDWR(tool_peer_db_fops,
tool_peer_db_read,
tool_peer_db_write);
static ssize_t tool_peer_mask_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_dbfn_read(tc, ubuf, size, offp,
tc->ntb->ops->peer_db_read_mask);
}
static ssize_t tool_peer_mask_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_dbfn_write(tc, ubuf, size, offp,
tc->ntb->ops->peer_db_set_mask,
tc->ntb->ops->peer_db_clear_mask);
}
static TOOL_FOPS_RDWR(tool_peer_mask_fops,
tool_peer_mask_read,
tool_peer_mask_write);
static ssize_t tool_spad_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_spadfn_read(tc, ubuf, size, offp,
tc->ntb->ops->spad_read);
}
static ssize_t tool_spad_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_spadfn_write(tc, ubuf, size, offp,
tc->ntb->ops->spad_write);
}
static TOOL_FOPS_RDWR(tool_spad_fops,
tool_spad_read,
tool_spad_write);
static ssize_t tool_peer_spad_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_spadfn_read(tc, ubuf, size, offp,
tc->ntb->ops->peer_spad_read);
}
static ssize_t tool_peer_spad_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
return tool_spadfn_write(tc, ubuf, size, offp,
tc->ntb->ops->peer_spad_write);
}
static TOOL_FOPS_RDWR(tool_peer_spad_fops,
tool_peer_spad_read,
tool_peer_spad_write);
static ssize_t tool_link_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
char buf[3];
buf[0] = ntb_link_is_up(tc->ntb, NULL, NULL) ? 'Y' : 'N';
buf[1] = '\n';
buf[2] = '\0';
return simple_read_from_buffer(ubuf, size, offp, buf, 2);
}
static ssize_t tool_link_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
char buf[32];
size_t buf_size;
bool val;
int rc;
buf_size = min(size, (sizeof(buf) - 1));
if (copy_from_user(buf, ubuf, buf_size))
return -EFAULT;
buf[buf_size] = '\0';
rc = strtobool(buf, &val);
if (rc)
return rc;
if (val)
rc = ntb_link_enable(tc->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
else
rc = ntb_link_disable(tc->ntb);
if (rc)
return rc;
return size;
}
static TOOL_FOPS_RDWR(tool_link_fops,
tool_link_read,
tool_link_write);
static ssize_t tool_link_event_write(struct file *filep,
const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
char buf[32];
size_t buf_size;
bool val;
int rc;
buf_size = min(size, (sizeof(buf) - 1));
if (copy_from_user(buf, ubuf, buf_size))
return -EFAULT;
buf[buf_size] = '\0';
rc = strtobool(buf, &val);
if (rc)
return rc;
if (wait_event_interruptible(tc->link_wq,
ntb_link_is_up(tc->ntb, NULL, NULL) == val))
return -ERESTART;
return size;
}
static TOOL_FOPS_RDWR(tool_link_event_fops,
NULL,
tool_link_event_write);
static ssize_t tool_mw_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_mw *mw = filep->private_data;
ssize_t rc;
loff_t pos = *offp;
void *buf;
if (mw->local == NULL)
return -EIO;
if (pos < 0)
return -EINVAL;
if (pos >= mw->win_size || !size)
return 0;
if (size > mw->win_size - pos)
size = mw->win_size - pos;
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
memcpy_fromio(buf, mw->local + pos, size);
rc = copy_to_user(ubuf, buf, size);
if (rc == size) {
rc = -EFAULT;
goto err_free;
}
size -= rc;
*offp = pos + size;
rc = size;
err_free:
kfree(buf);
return rc;
}
static ssize_t tool_mw_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_mw *mw = filep->private_data;
ssize_t rc;
loff_t pos = *offp;
void *buf;
if (pos < 0)
return -EINVAL;
if (pos >= mw->win_size || !size)
return 0;
if (size > mw->win_size - pos)
size = mw->win_size - pos;
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
rc = copy_from_user(buf, ubuf, size);
if (rc == size) {
rc = -EFAULT;
goto err_free;
}
size -= rc;
*offp = pos + size;
rc = size;
memcpy_toio(mw->local + pos, buf, size);
err_free:
kfree(buf);
return rc;
}
static TOOL_FOPS_RDWR(tool_mw_fops,
tool_mw_read,
tool_mw_write);
static ssize_t tool_peer_mw_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_mw *mw = filep->private_data;
if (!mw->peer)
return -ENXIO;
return simple_read_from_buffer(ubuf, size, offp, mw->peer, mw->size);
}
static ssize_t tool_peer_mw_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_mw *mw = filep->private_data;
if (!mw->peer)
return -ENXIO;
return simple_write_to_buffer(mw->peer, mw->size, offp, ubuf, size);
}
static TOOL_FOPS_RDWR(tool_peer_mw_fops,
tool_peer_mw_read,
tool_peer_mw_write);
static int tool_setup_mw(struct tool_ctx *tc, int idx, size_t req_size)
{
int rc;
struct tool_mw *mw = &tc->mws[idx];
phys_addr_t base;
resource_size_t size, align, align_size;
char buf[16];
if (mw->peer)
return 0;
rc = ntb_mw_get_range(tc->ntb, idx, &base, &size, &align,
&align_size);
if (rc)
return rc;
mw->size = min_t(resource_size_t, req_size, size);
mw->size = round_up(mw->size, align);
mw->size = round_up(mw->size, align_size);
mw->peer = dma_alloc_coherent(&tc->ntb->pdev->dev, mw->size,
&mw->peer_dma, GFP_KERNEL);
if (!mw->peer)
return -ENOMEM;
rc = ntb_mw_set_trans(tc->ntb, idx, mw->peer_dma, mw->size);
if (rc)
goto err_free_dma;
snprintf(buf, sizeof(buf), "peer_mw%d", idx);
mw->peer_dbg_file = debugfs_create_file(buf, S_IRUSR | S_IWUSR,
mw->tc->dbgfs, mw,
&tool_peer_mw_fops);
return 0;
err_free_dma:
dma_free_coherent(&tc->ntb->pdev->dev, mw->size,
mw->peer,
mw->peer_dma);
mw->peer = NULL;
mw->peer_dma = 0;
mw->size = 0;
return rc;
}
static void tool_free_mw(struct tool_ctx *tc, int idx)
{
struct tool_mw *mw = &tc->mws[idx];
if (mw->peer) {
ntb_mw_clear_trans(tc->ntb, idx);
dma_free_coherent(&tc->ntb->pdev->dev, mw->size,
mw->peer,
mw->peer_dma);
}
mw->peer = NULL;
mw->peer_dma = 0;
debugfs_remove(mw->peer_dbg_file);
mw->peer_dbg_file = NULL;
}
static ssize_t tool_peer_mw_trans_read(struct file *filep,
char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_mw *mw = filep->private_data;
char *buf;
size_t buf_size;
ssize_t ret, off = 0;
phys_addr_t base;
resource_size_t mw_size;
resource_size_t align;
resource_size_t align_size;
buf_size = min_t(size_t, size, 512);
buf = kmalloc(buf_size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ntb_mw_get_range(mw->tc->ntb, mw->idx,
&base, &mw_size, &align, &align_size);
off += scnprintf(buf + off, buf_size - off,
"Peer MW %d Information:\n", mw->idx);
off += scnprintf(buf + off, buf_size - off,
"Physical Address \t%pa[p]\n",
&base);
off += scnprintf(buf + off, buf_size - off,
"Window Size \t%lld\n",
(unsigned long long)mw_size);
off += scnprintf(buf + off, buf_size - off,
"Alignment \t%lld\n",
(unsigned long long)align);
off += scnprintf(buf + off, buf_size - off,
"Size Alignment \t%lld\n",
(unsigned long long)align_size);
off += scnprintf(buf + off, buf_size - off,
"Ready \t%c\n",
(mw->peer) ? 'Y' : 'N');
off += scnprintf(buf + off, buf_size - off,
"Allocated Size \t%zd\n",
(mw->peer) ? (size_t)mw->size : 0);
ret = simple_read_from_buffer(ubuf, size, offp, buf, off);
kfree(buf);
return ret;
}
static ssize_t tool_peer_mw_trans_write(struct file *filep,
const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_mw *mw = filep->private_data;
char buf[32];
size_t buf_size;
unsigned long long val;
int rc;
buf_size = min(size, (sizeof(buf) - 1));
if (copy_from_user(buf, ubuf, buf_size))
return -EFAULT;
buf[buf_size] = '\0';
rc = kstrtoull(buf, 0, &val);
if (rc)
return rc;
tool_free_mw(mw->tc, mw->idx);
if (val)
rc = tool_setup_mw(mw->tc, mw->idx, val);
if (rc)
return rc;
return size;
}
static TOOL_FOPS_RDWR(tool_peer_mw_trans_fops,
tool_peer_mw_trans_read,
tool_peer_mw_trans_write);
static int tool_init_mw(struct tool_ctx *tc, int idx)
{
struct tool_mw *mw = &tc->mws[idx];
phys_addr_t base;
int rc;
rc = ntb_mw_get_range(tc->ntb, idx, &base, &mw->win_size,
NULL, NULL);
if (rc)
return rc;
mw->tc = tc;
mw->idx = idx;
mw->local = ioremap_wc(base, mw->win_size);
if (!mw->local)
return -EFAULT;
return 0;
}
static void tool_free_mws(struct tool_ctx *tc)
{
int i;
for (i = 0; i < tc->mw_count; i++) {
tool_free_mw(tc, i);
if (tc->mws[i].local)
iounmap(tc->mws[i].local);
tc->mws[i].local = NULL;
}
}
static void tool_setup_dbgfs(struct tool_ctx *tc)
{
int i;
/* This modules is useless without dbgfs... */
if (!tool_dbgfs) {
tc->dbgfs = NULL;
return;
}
tc->dbgfs = debugfs_create_dir(dev_name(&tc->ntb->dev),
tool_dbgfs);
if (!tc->dbgfs)
return;
debugfs_create_file("db", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_db_fops);
debugfs_create_file("mask", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_mask_fops);
debugfs_create_file("peer_db", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_peer_db_fops);
debugfs_create_file("peer_mask", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_peer_mask_fops);
debugfs_create_file("spad", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_spad_fops);
debugfs_create_file("peer_spad", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_peer_spad_fops);
debugfs_create_file("link", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_link_fops);
debugfs_create_file("link_event", S_IWUSR, tc->dbgfs,
tc, &tool_link_event_fops);
for (i = 0; i < tc->mw_count; i++) {
char buf[30];
snprintf(buf, sizeof(buf), "mw%d", i);
debugfs_create_file(buf, S_IRUSR | S_IWUSR, tc->dbgfs,
&tc->mws[i], &tool_mw_fops);
snprintf(buf, sizeof(buf), "peer_trans%d", i);
debugfs_create_file(buf, S_IRUSR | S_IWUSR, tc->dbgfs,
&tc->mws[i], &tool_peer_mw_trans_fops);
}
}
static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb)
{
struct tool_ctx *tc;
int rc;
int i;
if (ntb_db_is_unsafe(ntb))
dev_dbg(&ntb->dev, "doorbell is unsafe\n");
if (ntb_spad_is_unsafe(ntb))
dev_dbg(&ntb->dev, "scratchpad is unsafe\n");
tc = kzalloc(sizeof(*tc), GFP_KERNEL);
if (!tc) {
rc = -ENOMEM;
goto err_tc;
}
tc->ntb = ntb;
init_waitqueue_head(&tc->link_wq);
tc->mw_count = min(ntb_mw_count(tc->ntb), MAX_MWS);
for (i = 0; i < tc->mw_count; i++) {
rc = tool_init_mw(tc, i);
if (rc)
goto err_ctx;
}
tool_setup_dbgfs(tc);
rc = ntb_set_ctx(ntb, tc, &tool_ops);
if (rc)
goto err_ctx;
ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
ntb_link_event(ntb);
return 0;
err_ctx:
tool_free_mws(tc);
debugfs_remove_recursive(tc->dbgfs);
kfree(tc);
err_tc:
return rc;
}
static void tool_remove(struct ntb_client *self, struct ntb_dev *ntb)
{
struct tool_ctx *tc = ntb->ctx;
tool_free_mws(tc);
ntb_clear_ctx(ntb);
ntb_link_disable(ntb);
debugfs_remove_recursive(tc->dbgfs);
kfree(tc);
}
static struct ntb_client tool_client = {
.ops = {
.probe = tool_probe,
.remove = tool_remove,
},
};
static int __init tool_init(void)
{
int rc;
if (debugfs_initialized())
tool_dbgfs = debugfs_create_dir(KBUILD_MODNAME, NULL);
rc = ntb_register_client(&tool_client);
if (rc)
goto err_client;
return 0;
err_client:
debugfs_remove_recursive(tool_dbgfs);
return rc;
}
module_init(tool_init);
static void __exit tool_exit(void)
{
ntb_unregister_client(&tool_client);
debugfs_remove_recursive(tool_dbgfs);
}
module_exit(tool_exit);
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