diff options
Diffstat (limited to 'drivers/pci/hotplug/cpqphp_sysfs.c')
| -rw-r--r-- | drivers/pci/hotplug/cpqphp_sysfs.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/cpqphp_sysfs.c b/drivers/pci/hotplug/cpqphp_sysfs.c new file mode 100644 index 000000000..fed1360ee --- /dev/null +++ b/drivers/pci/hotplug/cpqphp_sysfs.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Compaq Hot Plug Controller Driver + * + * Copyright (C) 1995,2001 Compaq Computer Corporation + * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com) + * Copyright (C) 2001 IBM Corp. + * + * All rights reserved. + * + * Send feedback to <greg@kroah.com> + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/proc_fs.h> +#include <linux/workqueue.h> +#include <linux/pci.h> +#include <linux/pci_hotplug.h> +#include <linux/mutex.h> +#include <linux/debugfs.h> +#include "cpqphp.h" + +static DEFINE_MUTEX(cpqphp_mutex); +static int show_ctrl(struct controller *ctrl, char *buf) +{ + char *out = buf; + int index; + struct pci_resource *res; + + out += sprintf(buf, "Free resources: memory\n"); + index = 11; + res = ctrl->mem_head; + while (res && index--) { + out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); + res = res->next; + } + out += sprintf(out, "Free resources: prefetchable memory\n"); + index = 11; + res = ctrl->p_mem_head; + while (res && index--) { + out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); + res = res->next; + } + out += sprintf(out, "Free resources: IO\n"); + index = 11; + res = ctrl->io_head; + while (res && index--) { + out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); + res = res->next; + } + out += sprintf(out, "Free resources: bus numbers\n"); + index = 11; + res = ctrl->bus_head; + while (res && index--) { + out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); + res = res->next; + } + + return out - buf; +} + +static int show_dev(struct controller *ctrl, char *buf) +{ + char *out = buf; + int index; + struct pci_resource *res; + struct pci_func *new_slot; + struct slot *slot; + + slot = ctrl->slot; + + while (slot) { + new_slot = cpqhp_slot_find(slot->bus, slot->device, 0); + if (!new_slot) + break; + out += sprintf(out, "assigned resources: memory\n"); + index = 11; + res = new_slot->mem_head; + while (res && index--) { + out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); + res = res->next; + } + out += sprintf(out, "assigned resources: prefetchable memory\n"); + index = 11; + res = new_slot->p_mem_head; + while (res && index--) { + out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); + res = res->next; + } + out += sprintf(out, "assigned resources: IO\n"); + index = 11; + res = new_slot->io_head; + while (res && index--) { + out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); + res = res->next; + } + out += sprintf(out, "assigned resources: bus numbers\n"); + index = 11; + res = new_slot->bus_head; + while (res && index--) { + out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); + res = res->next; + } + slot = slot->next; + } + + return out - buf; +} + +static int spew_debug_info(struct controller *ctrl, char *data, int size) +{ + int used; + + used = size - show_ctrl(ctrl, data); + used = (size - used) - show_dev(ctrl, &data[used]); + return used; +} + +struct ctrl_dbg { + int size; + char *data; + struct controller *ctrl; +}; + +#define MAX_OUTPUT (4*PAGE_SIZE) + +static int open(struct inode *inode, struct file *file) +{ + struct controller *ctrl = inode->i_private; + struct ctrl_dbg *dbg; + int retval = -ENOMEM; + + mutex_lock(&cpqphp_mutex); + dbg = kmalloc(sizeof(*dbg), GFP_KERNEL); + if (!dbg) + goto exit; + dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL); + if (!dbg->data) { + kfree(dbg); + goto exit; + } + dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT); + file->private_data = dbg; + retval = 0; +exit: + mutex_unlock(&cpqphp_mutex); + return retval; +} + +static loff_t lseek(struct file *file, loff_t off, int whence) +{ + struct ctrl_dbg *dbg = file->private_data; + return fixed_size_llseek(file, off, whence, dbg->size); +} + +static ssize_t read(struct file *file, char __user *buf, + size_t nbytes, loff_t *ppos) +{ + struct ctrl_dbg *dbg = file->private_data; + return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size); +} + +static int release(struct inode *inode, struct file *file) +{ + struct ctrl_dbg *dbg = file->private_data; + + kfree(dbg->data); + kfree(dbg); + return 0; +} + +static const struct file_operations debug_ops = { + .owner = THIS_MODULE, + .open = open, + .llseek = lseek, + .read = read, + .release = release, +}; + +static struct dentry *root; + +void cpqhp_initialize_debugfs(void) +{ + if (!root) + root = debugfs_create_dir("cpqhp", NULL); +} + +void cpqhp_shutdown_debugfs(void) +{ + debugfs_remove(root); +} + +void cpqhp_create_debugfs_files(struct controller *ctrl) +{ + ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev), + S_IRUGO, root, ctrl, &debug_ops); +} + +void cpqhp_remove_debugfs_files(struct controller *ctrl) +{ + debugfs_remove(ctrl->dentry); + ctrl->dentry = NULL; +} + |