v4.19.13 snapshot.
diff --git a/drivers/scsi/bfa/bfad_debugfs.c b/drivers/scsi/bfa/bfad_debugfs.c
new file mode 100644
index 0000000..349cfe7
--- /dev/null
+++ b/drivers/scsi/bfa/bfad_debugfs.c
@@ -0,0 +1,530 @@
+/*
+ * 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.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License (GPL) Version 2 as
+ * published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#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;
+
+ if (fw_debug->debug_buffer)
+ 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);
+ if (!bfa_debugfs_root) {
+ printk(KERN_WARNING
+ "BFA debugfs root dir creation failed\n");
+ goto err;
+ }
+ }
+
+ /* 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);
+ if (!port->port_debugfs_root) {
+ printk(KERN_WARNING
+ "bfa %s: debugfs root creation failed\n",
+ bfad->pci_name);
+ goto err;
+ }
+
+ 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);
+ if (!bfad->bfad_dentry_files[i]) {
+ printk(KERN_WARNING
+ "bfa %s: debugfs %s creation failed\n",
+ bfad->pci_name, file->name);
+ goto err;
+ }
+ }
+ }
+
+err:
+ 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;
+ }
+}