From 6465d02ee15f7a45339b7e7859d0a0f22100ca87 Mon Sep 17 00:00:00 2001 From: Jon Mason Date: Mon, 7 Apr 2014 10:55:47 -0700 Subject: [PATCH] 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: Jon Mason --- drivers/ntb/ntb_hw.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++ drivers/ntb/ntb_hw.h | 1 + drivers/ntb/ntb_regs.h | 7 +++- 3 files changed, 107 insertions(+), 2 deletions(-) diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index 372e08c..a3990363 100644 --- a/drivers/ntb/ntb_hw.c +++ b/drivers/ntb/ntb_hw.c @@ -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); diff --git a/drivers/ntb/ntb_hw.h b/drivers/ntb/ntb_hw.h index 465517b..ddbcbfd 100644 --- a/drivers/ntb/ntb_hw.h +++ b/drivers/ntb/ntb_hw.h @@ -152,6 +152,7 @@ struct ntb_device { struct delayed_work lr_timer; struct dentry *debugfs_dir; + struct dentry *debugfs_info; }; /** diff --git a/drivers/ntb/ntb_regs.h b/drivers/ntb/ntb_regs.h index 9774506..0787205 100644 --- a/drivers/ntb/ntb_regs.h +++ b/drivers/ntb/ntb_regs.h @@ -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 -- 2.7.4