Commit 6465d02e authored by Jon Mason's avatar Jon Mason Committed by Jon Mason
Browse files

NTB: debugfs device entry 



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: default avatarJon Mason <jon.mason@intel.com>
parent bfe01a5b

drivers/ntb/ntb_hw.c

+101 −0
Original line number Diff line number Diff line
@@ -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);

drivers/ntb/ntb_hw.h

+1 −0
Original line number Diff line number Diff line
@@ -152,6 +152,7 @@ struct ntb_device { 
	struct delayed_work lr_timer;



	struct dentry *debugfs_dir;

	struct dentry *debugfs_info;

};



/**

drivers/ntb/ntb_regs.h

+5 −2
Original line number Diff line number Diff line
@@ -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