diff options
Diffstat (limited to 'drivers/ntb/test/ntb_tool.c')
| -rw-r--r-- | drivers/ntb/test/ntb_tool.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c new file mode 100644 index 000000000000..6f5dc6ca673d --- /dev/null +++ b/drivers/ntb/test/ntb_tool.c @@ -0,0 +1,556 @@ +/* + * 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. + * + * # 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. + */ + +#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/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); + +static struct dentry *tool_dbgfs; + +struct tool_ctx { + struct ntb_dev *ntb; + struct dentry *dbgfs; +}; + +#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); +} + +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; + + buf_size = min_t(size_t, size, 0x100); + + buf = kmalloc(buf_size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + pos = 0; + + spad_count = ntb_spad_count(tc->ntb); + 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; + 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; + + n = sscanf(buf, "%d %i%n", &spad_idx, &spad_val, &pos); + while (n == 2) { + rc = spad_write_fn(tc->ntb, spad_idx, spad_val); + if (rc) + break; + + n = sscanf(buf + pos, "%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 void tool_setup_dbgfs(struct tool_ctx *tc) +{ + /* 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); +} + +static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb) +{ + struct tool_ctx *tc; + int rc; + + 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 = kmalloc(sizeof(*tc), GFP_KERNEL); + if (!tc) { + rc = -ENOMEM; + goto err_tc; + } + + tc->ntb = ntb; + + 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: + 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; + + 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); |