diff options
| -rw-r--r-- | drivers/staging/unisys/virthba/virthba.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/staging/unisys/virthba/virthba.c b/drivers/staging/unisys/virthba/virthba.c index b9cbcf2f569a..121cc05d7727 100644 --- a/drivers/staging/unisys/virthba/virthba.c +++ b/drivers/staging/unisys/virthba/virthba.c @@ -50,6 +50,7 @@ #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> #include <asm/param.h> +#include <linux/debugfs.h> #include <linux/types.h> #include "virthba.h" @@ -66,6 +67,11 @@ /* NOTE: L1_CACHE_BYTES >=128 */ #define DEVICE_ATTRIBUTE struct device_attribute + /* MAX_BUF = 6 lines x 10 MAXVHBA x 80 characters + * = 4800 bytes ~ 2^13 = 8192 bytes + */ +#define MAX_BUF 8192 + /*****************************************************/ /* Forward declarations */ /*****************************************************/ @@ -104,6 +110,8 @@ static int virthba_serverup(struct virtpci_dev *virtpcidev); static int virthba_serverdown(struct virtpci_dev *virtpcidev, u32 state); static void doDiskAddRemove(struct work_struct *work); static void virthba_serverdown_complete(struct work_struct *work); +static ssize_t info_debugfs_read(struct file *file, char __user *buf, + size_t len, loff_t *offset); /*****************************************************/ /* Globals */ @@ -221,9 +229,18 @@ struct virthba_devices_open { struct virthba_info *virthbainfo; }; +static const struct file_operations debugfs_info_fops = { + .read = info_debugfs_read, +}; + +/*****************************************************/ +/* Structs */ +/*****************************************************/ + #define VIRTHBASOPENMAX 1 /* array of open devices maintained by open() and close(); */ static struct virthba_devices_open VirtHbasOpen[VIRTHBASOPENMAX]; +static struct dentry *virthba_debugfs_dir; /*****************************************************/ /* Local Functions */ @@ -1342,6 +1359,62 @@ process_incoming_rsps(void *v) complete_and_exit(&dc->threadinfo.has_stopped, 0); } +/*****************************************************/ +/* Debugfs filesystem functions */ +/*****************************************************/ + +static ssize_t info_debugfs_read(struct file *file, + char __user *buf, size_t len, loff_t *offset) +{ + ssize_t bytes_read = 0; + int str_pos = 0; + U64 phys_flags_addr; + int i; + struct virthba_info *virthbainfo; + char *vbuf; + + if (len > MAX_BUF) + len = MAX_BUF; + vbuf = kzalloc(len, GFP_KERNEL); + if (!vbuf) + return -ENOMEM; + + for (i = 0; i < VIRTHBASOPENMAX; i++) { + if (VirtHbasOpen[i].virthbainfo == NULL) + continue; + + virthbainfo = VirtHbasOpen[i].virthbainfo; + + str_pos += scnprintf(vbuf + str_pos, + len - str_pos, "MaxBuffLen:%u\n", MaxBuffLen); + + str_pos += scnprintf(vbuf + str_pos, len - str_pos, + "\nvirthba result queue poll wait:%d usecs.\n", + rsltq_wait_usecs); + str_pos += scnprintf(vbuf + str_pos, len - str_pos, + "\ninterrupts_rcvd = %llu, interrupts_disabled = %llu\n", + virthbainfo->interrupts_rcvd, + virthbainfo->interrupts_disabled); + str_pos += scnprintf(vbuf + str_pos, + len - str_pos, "\ninterrupts_notme = %llu,\n", + virthbainfo->interrupts_notme); + phys_flags_addr = virt_to_phys((__force void *) + virthbainfo->flags_addr); + str_pos += scnprintf(vbuf + str_pos, len - str_pos, + "flags_addr = %p, phys_flags_addr=0x%016llx, FeatureFlags=%llu\n", + virthbainfo->flags_addr, phys_flags_addr, + (__le64)readq(virthbainfo->flags_addr)); + str_pos += scnprintf(vbuf + str_pos, + len - str_pos, "acquire_failed_cnt:%llu\n", + virthbainfo->acquire_failed_cnt); + str_pos += scnprintf(vbuf + str_pos, len - str_pos, "\n"); + } + + bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos); + kfree(vbuf); + return bytes_read; +} + /* As per VirtpciFunc returns 1 for success and 0 for failure */ static int virthba_serverup(struct virtpci_dev *virtpcidev) @@ -1526,6 +1599,10 @@ virthba_mod_init(void) POSTCODE_SEVERITY_ERR); } else { + /* create the debugfs directories and entries */ + virthba_debugfs_dir = debugfs_create_dir("virthba", NULL); + debugfs_create_file("info", S_IRUSR, virthba_debugfs_dir, + NULL, &debugfs_info_fops); /* Initialize DARWorkQ */ INIT_WORK(&DARWorkQ, doDiskAddRemove); spin_lock_init(&DARWorkQLock); @@ -1605,6 +1682,8 @@ virthba_mod_exit(void) virthba_serverdown_workqueue = NULL; } + /* remove debugfs directory and files. */ + debugfs_remove_recursive(virthba_debugfs_dir); LOGINF("Leaving virthba_mod_exit\n"); } |