diff options
Diffstat (limited to 'drivers/scsi/bfa/bfad_debugfs.c')
| -rw-r--r-- | drivers/scsi/bfa/bfad_debugfs.c | 503 |
1 files changed, 503 insertions, 0 deletions
diff --git a/drivers/scsi/bfa/bfad_debugfs.c b/drivers/scsi/bfa/bfad_debugfs.c new file mode 100644 index 0000000000..52db147d99 --- /dev/null +++ b/drivers/scsi/bfa/bfad_debugfs.c @@ -0,0 +1,503 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2005-2014 Brocade Communications Systems, Inc. + * Copyright (c) 2014- QLogic Corporation. + * All rights reserved + * www.qlogic.com + * + * Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter. + */ + +#include <linux/debugfs.h> +#include <linux/export.h> + +#include "bfad_drv.h" +#include "bfad_im.h" + +/* + * BFA debufs interface + * + * To access the interface, debugfs file system should be mounted + * if not already mounted using: + * mount -t debugfs none /sys/kernel/debug + * + * BFA Hierarchy: + * - bfa/pci_dev:<pci_name> + * where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa + * + * Debugging service available per pci_dev: + * fwtrc: To collect current firmware trace. + * drvtrc: To collect current driver trace + * fwsave: To collect last saved fw trace as a result of firmware crash. + * regwr: To write one word to chip register + * regrd: To read one or more words from chip register. + */ + +struct bfad_debug_info { + char *debug_buffer; + void *i_private; + int buffer_len; +}; + +static int +bfad_debugfs_open_drvtrc(struct inode *inode, struct file *file) +{ + struct bfad_port_s *port = inode->i_private; + struct bfad_s *bfad = port->bfad; + struct bfad_debug_info *debug; + + debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL); + if (!debug) + return -ENOMEM; + + debug->debug_buffer = (void *) bfad->trcmod; + debug->buffer_len = sizeof(struct bfa_trc_mod_s); + + file->private_data = debug; + + return 0; +} + +static int +bfad_debugfs_open_fwtrc(struct inode *inode, struct file *file) +{ + struct bfad_port_s *port = inode->i_private; + struct bfad_s *bfad = port->bfad; + struct bfad_debug_info *fw_debug; + unsigned long flags; + int rc; + + fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL); + if (!fw_debug) + return -ENOMEM; + + fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s); + + fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len); + if (!fw_debug->debug_buffer) { + kfree(fw_debug); + printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n", + bfad->inst_no); + return -ENOMEM; + } + + spin_lock_irqsave(&bfad->bfad_lock, flags); + rc = bfa_ioc_debug_fwtrc(&bfad->bfa.ioc, + fw_debug->debug_buffer, + &fw_debug->buffer_len); + spin_unlock_irqrestore(&bfad->bfad_lock, flags); + if (rc != BFA_STATUS_OK) { + vfree(fw_debug->debug_buffer); + fw_debug->debug_buffer = NULL; + kfree(fw_debug); + printk(KERN_INFO "bfad[%d]: Failed to collect fwtrc\n", + bfad->inst_no); + return -ENOMEM; + } + + file->private_data = fw_debug; + + return 0; +} + +static int +bfad_debugfs_open_fwsave(struct inode *inode, struct file *file) +{ + struct bfad_port_s *port = inode->i_private; + struct bfad_s *bfad = port->bfad; + struct bfad_debug_info *fw_debug; + unsigned long flags; + int rc; + + fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL); + if (!fw_debug) + return -ENOMEM; + + fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s); + + fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len); + if (!fw_debug->debug_buffer) { + kfree(fw_debug); + printk(KERN_INFO "bfad[%d]: Failed to allocate fwsave buffer\n", + bfad->inst_no); + return -ENOMEM; + } + + spin_lock_irqsave(&bfad->bfad_lock, flags); + rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc, + fw_debug->debug_buffer, + &fw_debug->buffer_len); + spin_unlock_irqrestore(&bfad->bfad_lock, flags); + if (rc != BFA_STATUS_OK) { + vfree(fw_debug->debug_buffer); + fw_debug->debug_buffer = NULL; + kfree(fw_debug); + printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n", + bfad->inst_no); + return -ENOMEM; + } + + file->private_data = fw_debug; + + return 0; +} + +static int +bfad_debugfs_open_reg(struct inode *inode, struct file *file) +{ + struct bfad_debug_info *reg_debug; + + reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL); + if (!reg_debug) + return -ENOMEM; + + reg_debug->i_private = inode->i_private; + + file->private_data = reg_debug; + + return 0; +} + +/* Changes the current file position */ +static loff_t +bfad_debugfs_lseek(struct file *file, loff_t offset, int orig) +{ + struct bfad_debug_info *debug = file->private_data; + return fixed_size_llseek(file, offset, orig, + debug->buffer_len); +} + +static ssize_t +bfad_debugfs_read(struct file *file, char __user *buf, + size_t nbytes, loff_t *pos) +{ + struct bfad_debug_info *debug = file->private_data; + + if (!debug || !debug->debug_buffer) + return 0; + + return simple_read_from_buffer(buf, nbytes, pos, + debug->debug_buffer, debug->buffer_len); +} + +#define BFA_REG_CT_ADDRSZ (0x40000) +#define BFA_REG_CB_ADDRSZ (0x20000) +#define BFA_REG_ADDRSZ(__ioc) \ + ((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ? \ + BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ)) +#define BFA_REG_ADDRMSK(__ioc) (BFA_REG_ADDRSZ(__ioc) - 1) + +static bfa_status_t +bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len) +{ + u8 area; + + /* check [16:15] */ + area = (offset >> 15) & 0x7; + if (area == 0) { + /* PCIe core register */ + if ((offset + (len<<2)) > 0x8000) /* 8k dwords or 32KB */ + return BFA_STATUS_EINVAL; + } else if (area == 0x1) { + /* CB 32 KB memory page */ + if ((offset + (len<<2)) > 0x10000) /* 8k dwords or 32KB */ + return BFA_STATUS_EINVAL; + } else { + /* CB register space 64KB */ + if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc)) + return BFA_STATUS_EINVAL; + } + return BFA_STATUS_OK; +} + +static ssize_t +bfad_debugfs_read_regrd(struct file *file, char __user *buf, + size_t nbytes, loff_t *pos) +{ + struct bfad_debug_info *regrd_debug = file->private_data; + struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private; + struct bfad_s *bfad = port->bfad; + ssize_t rc; + + if (!bfad->regdata) + return 0; + + rc = simple_read_from_buffer(buf, nbytes, pos, + bfad->regdata, bfad->reglen); + + if ((*pos + nbytes) >= bfad->reglen) { + kfree(bfad->regdata); + bfad->regdata = NULL; + bfad->reglen = 0; + } + + return rc; +} + +static ssize_t +bfad_debugfs_write_regrd(struct file *file, const char __user *buf, + size_t nbytes, loff_t *ppos) +{ + struct bfad_debug_info *regrd_debug = file->private_data; + struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private; + struct bfad_s *bfad = port->bfad; + struct bfa_s *bfa = &bfad->bfa; + struct bfa_ioc_s *ioc = &bfa->ioc; + int addr, rc, i; + u32 len; + u32 *regbuf; + void __iomem *rb, *reg_addr; + unsigned long flags; + void *kern_buf; + + kern_buf = memdup_user(buf, nbytes); + if (IS_ERR(kern_buf)) + return PTR_ERR(kern_buf); + + rc = sscanf(kern_buf, "%x:%x", &addr, &len); + if (rc < 2 || len > (UINT_MAX >> 2)) { + printk(KERN_INFO + "bfad[%d]: %s failed to read user buf\n", + bfad->inst_no, __func__); + kfree(kern_buf); + return -EINVAL; + } + + kfree(kern_buf); + kfree(bfad->regdata); + bfad->regdata = NULL; + bfad->reglen = 0; + + bfad->regdata = kzalloc(len << 2, GFP_KERNEL); + if (!bfad->regdata) { + printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n", + bfad->inst_no); + return -ENOMEM; + } + + bfad->reglen = len << 2; + rb = bfa_ioc_bar0(ioc); + addr &= BFA_REG_ADDRMSK(ioc); + + /* offset and len sanity check */ + rc = bfad_reg_offset_check(bfa, addr, len); + if (rc) { + printk(KERN_INFO "bfad[%d]: Failed reg offset check\n", + bfad->inst_no); + kfree(bfad->regdata); + bfad->regdata = NULL; + bfad->reglen = 0; + return -EINVAL; + } + + reg_addr = rb + addr; + regbuf = (u32 *)bfad->regdata; + spin_lock_irqsave(&bfad->bfad_lock, flags); + for (i = 0; i < len; i++) { + *regbuf = readl(reg_addr); + regbuf++; + reg_addr += sizeof(u32); + } + spin_unlock_irqrestore(&bfad->bfad_lock, flags); + + return nbytes; +} + +static ssize_t +bfad_debugfs_write_regwr(struct file *file, const char __user *buf, + size_t nbytes, loff_t *ppos) +{ + struct bfad_debug_info *debug = file->private_data; + struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private; + struct bfad_s *bfad = port->bfad; + struct bfa_s *bfa = &bfad->bfa; + struct bfa_ioc_s *ioc = &bfa->ioc; + int addr, val, rc; + void __iomem *reg_addr; + unsigned long flags; + void *kern_buf; + + kern_buf = memdup_user(buf, nbytes); + if (IS_ERR(kern_buf)) + return PTR_ERR(kern_buf); + + rc = sscanf(kern_buf, "%x:%x", &addr, &val); + if (rc < 2) { + printk(KERN_INFO + "bfad[%d]: %s failed to read user buf\n", + bfad->inst_no, __func__); + kfree(kern_buf); + return -EINVAL; + } + kfree(kern_buf); + + addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */ + + /* offset and len sanity check */ + rc = bfad_reg_offset_check(bfa, addr, 1); + if (rc) { + printk(KERN_INFO + "bfad[%d]: Failed reg offset check\n", + bfad->inst_no); + return -EINVAL; + } + + reg_addr = (bfa_ioc_bar0(ioc)) + addr; + spin_lock_irqsave(&bfad->bfad_lock, flags); + writel(val, reg_addr); + spin_unlock_irqrestore(&bfad->bfad_lock, flags); + + return nbytes; +} + +static int +bfad_debugfs_release(struct inode *inode, struct file *file) +{ + struct bfad_debug_info *debug = file->private_data; + + if (!debug) + return 0; + + file->private_data = NULL; + kfree(debug); + return 0; +} + +static int +bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file) +{ + struct bfad_debug_info *fw_debug = file->private_data; + + if (!fw_debug) + return 0; + + vfree(fw_debug->debug_buffer); + + file->private_data = NULL; + kfree(fw_debug); + return 0; +} + +static const struct file_operations bfad_debugfs_op_drvtrc = { + .owner = THIS_MODULE, + .open = bfad_debugfs_open_drvtrc, + .llseek = bfad_debugfs_lseek, + .read = bfad_debugfs_read, + .release = bfad_debugfs_release, +}; + +static const struct file_operations bfad_debugfs_op_fwtrc = { + .owner = THIS_MODULE, + .open = bfad_debugfs_open_fwtrc, + .llseek = bfad_debugfs_lseek, + .read = bfad_debugfs_read, + .release = bfad_debugfs_release_fwtrc, +}; + +static const struct file_operations bfad_debugfs_op_fwsave = { + .owner = THIS_MODULE, + .open = bfad_debugfs_open_fwsave, + .llseek = bfad_debugfs_lseek, + .read = bfad_debugfs_read, + .release = bfad_debugfs_release_fwtrc, +}; + +static const struct file_operations bfad_debugfs_op_regrd = { + .owner = THIS_MODULE, + .open = bfad_debugfs_open_reg, + .llseek = bfad_debugfs_lseek, + .read = bfad_debugfs_read_regrd, + .write = bfad_debugfs_write_regrd, + .release = bfad_debugfs_release, +}; + +static const struct file_operations bfad_debugfs_op_regwr = { + .owner = THIS_MODULE, + .open = bfad_debugfs_open_reg, + .llseek = bfad_debugfs_lseek, + .write = bfad_debugfs_write_regwr, + .release = bfad_debugfs_release, +}; + +struct bfad_debugfs_entry { + const char *name; + umode_t mode; + const struct file_operations *fops; +}; + +static const struct bfad_debugfs_entry bfad_debugfs_files[] = { + { "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, }, + { "fwtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc, }, + { "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, }, + { "regrd", S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd, }, + { "regwr", S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr, }, +}; + +static struct dentry *bfa_debugfs_root; +static atomic_t bfa_debugfs_port_count; + +inline void +bfad_debugfs_init(struct bfad_port_s *port) +{ + struct bfad_s *bfad = port->bfad; + const struct bfad_debugfs_entry *file; + char name[64]; + int i; + + if (!bfa_debugfs_enable) + return; + + /* Setup the BFA debugfs root directory*/ + if (!bfa_debugfs_root) { + bfa_debugfs_root = debugfs_create_dir("bfa", NULL); + atomic_set(&bfa_debugfs_port_count, 0); + } + + /* Setup the pci_dev debugfs directory for the port */ + snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name); + if (!port->port_debugfs_root) { + port->port_debugfs_root = + debugfs_create_dir(name, bfa_debugfs_root); + + atomic_inc(&bfa_debugfs_port_count); + + for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) { + file = &bfad_debugfs_files[i]; + bfad->bfad_dentry_files[i] = + debugfs_create_file(file->name, + file->mode, + port->port_debugfs_root, + port, + file->fops); + } + } + + return; +} + +inline void +bfad_debugfs_exit(struct bfad_port_s *port) +{ + struct bfad_s *bfad = port->bfad; + int i; + + for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) { + if (bfad->bfad_dentry_files[i]) { + debugfs_remove(bfad->bfad_dentry_files[i]); + bfad->bfad_dentry_files[i] = NULL; + } + } + + /* Remove the pci_dev debugfs directory for the port */ + if (port->port_debugfs_root) { + debugfs_remove(port->port_debugfs_root); + port->port_debugfs_root = NULL; + atomic_dec(&bfa_debugfs_port_count); + } + + /* Remove the BFA debugfs root directory */ + if (atomic_read(&bfa_debugfs_port_count) == 0) { + debugfs_remove(bfa_debugfs_root); + bfa_debugfs_root = NULL; + } +} |