From 5e1073d3f4017980f256b06725229014829b821d Mon Sep 17 00:00:00 2001 From: Tim Sell Date: Thu, 12 May 2016 09:14:43 -0400 Subject: [PATCH] staging: unisys: visorhba: simplify and enhance debugfs interface debugfs info for each visorhba device is now presented by a file named of the following form within the debugfs tree: visorhba/vbus:dev/info where is the vbus number, and is the relative device number. Also, the debugfs presentation function was converted to use the seq_file interface, so that it could access the device context without resorting to a global array. This also simplified the function. Signed-off-by: Tim Sell Signed-off-by: David Kershner Signed-off-by: Greg Kroah-Hartman --- .../staging/unisys/visorhba/visorhba_main.c | 136 +++++++++--------- 1 file changed, 65 insertions(+), 71 deletions(-) diff --git a/drivers/staging/unisys/visorhba/visorhba_main.c b/drivers/staging/unisys/visorhba/visorhba_main.c index 5ea6bb2945e9..6a21514ed0a0 100644 --- a/drivers/staging/unisys/visorhba/visorhba_main.c +++ b/drivers/staging/unisys/visorhba/visorhba_main.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -51,14 +52,7 @@ static int visorhba_pause(struct visor_device *dev, static int visorhba_resume(struct visor_device *dev, visorbus_state_complete_func complete_func); -static ssize_t info_debugfs_read(struct file *file, char __user *buf, - size_t len, loff_t *offset); -static int set_no_disk_inquiry_result(unsigned char *buf, - size_t len, bool is_lun0); static struct dentry *visorhba_debugfs_dir; -static const struct file_operations debugfs_info_fops = { - .read = info_debugfs_read, -}; /* GUIDS for HBA channel type supported by this driver */ static struct visor_channeltype_descriptor visorhba_channel_types[] = { @@ -132,6 +126,9 @@ struct visorhba_devdata { * iovm, instead of raw pointers */ struct idr idr; + + struct dentry *debugfs_dir; + struct dentry *debugfs_info; }; struct visorhba_devices_open { @@ -667,66 +664,49 @@ static struct scsi_host_template visorhba_driver_template = { }; /** - * info_debugfs_read - debugfs interface to dump visorhba states - * @file: Debug file - * @buf: buffer to send back to user - * @len: len that can be written to buf - * @offset: offset into buf + * info_debugfs_show - debugfs interface to dump visorhba states * - * Dumps information about the visorhba driver and devices - * TODO: Make this per vhba - * Returns bytes_read + * This presents a file in the debugfs tree named: + * /visorhba/vbus:dev/info */ -static ssize_t info_debugfs_read(struct file *file, char __user *buf, - size_t len, loff_t *offset) +static int info_debugfs_show(struct seq_file *seq, void *v) { - ssize_t bytes_read = 0; - int str_pos = 0; - u64 phys_flags_addr; - int i; - struct visorhba_devdata *devdata; - char *vbuf; - - if (len > MAX_BUF) - len = MAX_BUF; - vbuf = kzalloc(len, GFP_KERNEL); - if (!vbuf) - return -ENOMEM; - - for (i = 0; i < VISORHBA_OPEN_MAX; i++) { - if (!visorhbas_open[i].devdata) - continue; - - devdata = visorhbas_open[i].devdata; - - str_pos += scnprintf(vbuf + str_pos, - len - str_pos, "max_buff_len:%u\n", - devdata->max_buff_len); - - str_pos += scnprintf(vbuf + str_pos, len - str_pos, - "\ninterrupts_rcvd = %llu, interrupts_disabled = %llu\n", - devdata->interrupts_rcvd, - devdata->interrupts_disabled); - str_pos += scnprintf(vbuf + str_pos, - len - str_pos, "\ninterrupts_notme = %llu,\n", - devdata->interrupts_notme); - phys_flags_addr = virt_to_phys((__force void *) - devdata->flags_addr); - str_pos += scnprintf(vbuf + str_pos, len - str_pos, - "flags_addr = %p, phys_flags_addr=0x%016llx, FeatureFlags=%llu\n", - devdata->flags_addr, phys_flags_addr, - (__le64)readq(devdata->flags_addr)); - str_pos += scnprintf(vbuf + str_pos, - len - str_pos, "acquire_failed_cnt:%llu\n", - devdata->acquire_failed_cnt); - str_pos += scnprintf(vbuf + str_pos, len - str_pos, "\n"); + struct visorhba_devdata *devdata = seq->private; + + seq_printf(seq, "max_buff_len = %u\n", devdata->max_buff_len); + seq_printf(seq, "interrupts_rcvd = %llu\n", devdata->interrupts_rcvd); + seq_printf(seq, "interrupts_disabled = %llu\n", + devdata->interrupts_disabled); + seq_printf(seq, "interrupts_notme = %llu\n", + devdata->interrupts_notme); + seq_printf(seq, "flags_addr = %p\n", devdata->flags_addr); + if (devdata->flags_addr) { + u64 phys_flags_addr = + virt_to_phys((__force void *)devdata->flags_addr); + seq_printf(seq, "phys_flags_addr = 0x%016llx\n", + phys_flags_addr); + seq_printf(seq, "FeatureFlags = %llu\n", + (__le64)readq(devdata->flags_addr)); } + seq_printf(seq, "acquire_failed_cnt = %llu\n", + devdata->acquire_failed_cnt); - bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos); - kfree(vbuf); - return bytes_read; + return 0; } +static int info_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, info_debugfs_show, inode->i_private); +} + +static const struct file_operations info_debugfs_fops = { + .owner = THIS_MODULE, + .open = info_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + /** * complete_taskmgmt_command - complete task management * @cmdrsp: Response from the IOVM @@ -1134,6 +1114,21 @@ static int visorhba_probe(struct visor_device *dev) devdata->dev = dev; dev_set_drvdata(&dev->device, devdata); + devdata->debugfs_dir = debugfs_create_dir(dev_name(&dev->device), + visorhba_debugfs_dir); + if (!devdata->debugfs_dir) { + err = -ENOMEM; + goto err_scsi_remove_host; + } + devdata->debugfs_info = + debugfs_create_file("info", S_IRUSR | S_IRGRP, + devdata->debugfs_dir, devdata, + &info_debugfs_fops); + if (!devdata->debugfs_info) { + err = -ENOMEM; + goto err_debugfs_dir; + } + init_waitqueue_head(&devdata->rsp_queue); spin_lock_init(&devdata->privlock); devdata->serverdown = false; @@ -1144,11 +1139,11 @@ static int visorhba_probe(struct visor_device *dev) channel_header.features); err = visorbus_read_channel(dev, channel_offset, &features, 8); if (err) - goto err_scsi_remove_host; + goto err_debugfs_info; features |= ULTRA_IO_CHANNEL_IS_POLLING; err = visorbus_write_channel(dev, channel_offset, &features, 8); if (err) - goto err_scsi_remove_host; + goto err_debugfs_info; idr_init(&devdata->idr); @@ -1160,6 +1155,12 @@ static int visorhba_probe(struct visor_device *dev) return 0; +err_debugfs_info: + debugfs_remove(devdata->debugfs_info); + +err_debugfs_dir: + debugfs_remove_recursive(devdata->debugfs_dir); + err_scsi_remove_host: scsi_remove_host(scsihost); @@ -1191,6 +1192,8 @@ static void visorhba_remove(struct visor_device *dev) idr_destroy(&devdata->idr); dev_set_drvdata(&dev->device, NULL); + debugfs_remove(devdata->debugfs_info); + debugfs_remove_recursive(devdata->debugfs_dir); } /** @@ -1201,21 +1204,12 @@ static void visorhba_remove(struct visor_device *dev) */ static int visorhba_init(void) { - struct dentry *ret; int rc = -ENOMEM; visorhba_debugfs_dir = debugfs_create_dir("visorhba", NULL); if (!visorhba_debugfs_dir) return -ENOMEM; - ret = debugfs_create_file("info", S_IRUSR, visorhba_debugfs_dir, NULL, - &debugfs_info_fops); - - if (!ret) { - rc = -EIO; - goto cleanup_debugfs; - } - rc = visorbus_register_visor_driver(&visorhba_driver); if (rc) goto cleanup_debugfs; -- 2.20.1