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NTB: debugfs device entry

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Create a debugfs entry for the NTB device to log the basic device info,
as well as display the error count on a number of registers.

Signed-off-by: Jon Mason <jon.mason@intel.com>
This commit is contained in:
Jon Mason 2014-04-07 10:55:47 -07:00 committed by Jon Mason
parent bfe01a5ba2
commit 6465d02ee1
3 changed files with 107 additions and 2 deletions
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101
drivers/ntb/ntb_hw.c
View file

@ -1344,6 +1344,101 @@ static void ntb_free_callbacks(struct ntb_device *ndev)
kfree(ndev->db_cb);
}
static ssize_t ntb_debugfs_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *offp)
{
struct ntb_device *ndev;
char *buf;
ssize_t ret, offset, out_count;
out_count = 500;
buf = kmalloc(out_count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ndev = filp->private_data;
offset = 0;
offset += snprintf(buf + offset, out_count - offset,
"NTB Device Information:\n");
offset += snprintf(buf + offset, out_count - offset,
"Connection Type - \t\t%s\n",
ndev->conn_type == NTB_CONN_TRANSPARENT ?
"Transparent" : (ndev->conn_type == NTB_CONN_B2B) ?
"Back to back" : "Root Port");
offset += snprintf(buf + offset, out_count - offset,
"Device Type - \t\t\t%s\n",
ndev->dev_type == NTB_DEV_USD ?
"DSD/USP" : "USD/DSP");
offset += snprintf(buf + offset, out_count - offset,
"Max Number of Callbacks - \t%u\n",
ntb_max_cbs(ndev));
offset += snprintf(buf + offset, out_count - offset,
"Link Status - \t\t\t%s\n",
ntb_hw_link_status(ndev) ? "Up" : "Down");
if (ntb_hw_link_status(ndev)) {
offset += snprintf(buf + offset, out_count - offset,
"Link Speed - \t\t\tPCI-E Gen %u\n",
ndev->link_speed);
offset += snprintf(buf + offset, out_count - offset,
"Link Width - \t\t\tx%u\n",
ndev->link_width);
}
if (ndev->hw_type != BWD_HW) {
u32 status32;
u16 status16;
int rc;
offset += snprintf(buf + offset, out_count - offset,
"\nNTB Device Statistics:\n");
offset += snprintf(buf + offset, out_count - offset,
"Upstream Memory Miss - \t%u\n",
readw(ndev->reg_base +
SNB_USMEMMISS_OFFSET));
offset += snprintf(buf + offset, out_count - offset,
"\nNTB Hardware Errors:\n");
rc = pci_read_config_word(ndev->pdev, SNB_DEVSTS_OFFSET,
&status16);
if (!rc)
offset += snprintf(buf + offset, out_count - offset,
"DEVSTS - \t%#06x\n", status16);
rc = pci_read_config_word(ndev->pdev, SNB_LINK_STATUS_OFFSET,
&status16);
if (!rc)
offset += snprintf(buf + offset, out_count - offset,
"LNKSTS - \t%#06x\n", status16);
rc = pci_read_config_dword(ndev->pdev, SNB_UNCERRSTS_OFFSET,
&status32);
if (!rc)
offset += snprintf(buf + offset, out_count - offset,
"UNCERRSTS - \t%#010x\n", status32);
rc = pci_read_config_dword(ndev->pdev, SNB_CORERRSTS_OFFSET,
&status32);
if (!rc)
offset += snprintf(buf + offset, out_count - offset,
"CORERRSTS - \t%#010x\n", status32);
}
if (offset > out_count)
offset = out_count;
ret = simple_read_from_buffer(ubuf, count, offp, buf, offset);
kfree(buf);
return ret;
}
static const struct file_operations ntb_debugfs_info = {
.owner = THIS_MODULE,
.open = simple_open,
.read = ntb_debugfs_read,
};
static void ntb_setup_debugfs(struct ntb_device *ndev)
{
if (!debugfs_initialized())
@ -1354,6 +1449,11 @@ static void ntb_setup_debugfs(struct ntb_device *ndev)
ndev->debugfs_dir = debugfs_create_dir(pci_name(ndev->pdev),
debugfs_dir);
if (ndev->debugfs_dir)
ndev->debugfs_info = debugfs_create_file("info", S_IRUSR,
ndev->debugfs_dir,
ndev,
&ntb_debugfs_info);
}
static void ntb_free_debugfs(struct ntb_device *ndev)
@ -1542,4 +1642,5 @@ static struct pci_driver ntb_pci_driver = {
.probe = ntb_pci_probe,
.remove = ntb_pci_remove,
};
module_pci_driver(ntb_pci_driver);

1
drivers/ntb/ntb_hw.h
View file

@ -152,6 +152,7 @@ struct ntb_device {
struct delayed_work lr_timer;
struct dentry *debugfs_dir;
struct dentry *debugfs_info;
};
/**

7
drivers/ntb/ntb_regs.h
View file

@ -62,10 +62,13 @@
#define SNB_DB_HW_LINK 0x8000
#define SNB_UNCERRSTS_OFFSET 0x014C
#define SNB_CORERRSTS_OFFSET 0x0158
#define SNB_LINK_STATUS_OFFSET 0x01A2
#define SNB_PCICMD_OFFSET 0x0504
#define SNB_DEVCTRL_OFFSET 0x0598
#define SNB_DEVSTS_OFFSET 0x059A
#define SNB_SLINK_STATUS_OFFSET 0x05A2
#define SNB_LINK_STATUS_OFFSET 0x01A2
#define SNB_PBAR2LMT_OFFSET 0x0000
#define SNB_PBAR4LMT_OFFSET 0x0008
@ -84,7 +87,7 @@
#define SNB_PDBMSK_OFFSET 0x0062
#define SNB_SDOORBELL_OFFSET 0x0064
#define SNB_SDBMSK_OFFSET 0x0066
#define SNB_USMEMMISS 0x0070
#define SNB_USMEMMISS_OFFSET 0x0070
#define SNB_SPAD_OFFSET 0x0080
#define SNB_SPADSEMA4_OFFSET 0x00c0
#define SNB_WCCNTRL_OFFSET 0x00e0