cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/wireless/broadcom/b43/debugfs.c

/*

  Broadcom B43 wireless driver

  debugfs driver debugging code

  Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  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.

  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/mutex.h>

#include "b43.h"
#include "main.h"
#include "debugfs.h"
#include "dma.h"
#include "xmit.h"


/* The root directory. */

static struct dentry *rootdir;


struct b43_debugfs_fops {
	
ssize_t (*read)(struct b43_wldev *dev, char *buf, size_t bufsize);
	
int (*write)(struct b43_wldev *dev, const char *buf, size_t count);
	
struct file_operations fops;
	/* Offset of struct b43_dfs_file in struct b43_dfsentry */
	
size_t file_struct_offset;
};


static inline struct b43_dfs_file *fops_to_dfs_file(struct b43_wldev *dev, const struct b43_debugfs_fops *dfops) { void *p; p = dev->dfsentry; p += dfops->file_struct_offset; return p; }

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#define fappend(fmt, x...) \ do { \ if (bufsize - count) \ count += snprintf(buf + count, \ bufsize - count, \ fmt , ##x); \ else \ printk(KERN_ERR "b43: fappend overflow\n"); \ } while (0) /* The biggest address values for SHM access from the debugfs files. */ #define B43_MAX_SHM_ROUTING 4 #define B43_MAX_SHM_ADDR 0xFFFF
static ssize_t shm16read__read_file(struct b43_wldev *dev, char *buf, size_t bufsize) { ssize_t count = 0; unsigned int routing, addr; u16 val; routing = dev->dfsentry->shm16read_routing_next; addr = dev->dfsentry->shm16read_addr_next; if ((routing > B43_MAX_SHM_ROUTING) || (addr > B43_MAX_SHM_ADDR)) return -EDESTADDRREQ; val = b43_shm_read16(dev, routing, addr); fappend("0x%04X\n", val); return count; }

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static int shm16read__write_file(struct b43_wldev *dev, const char *buf, size_t count) { unsigned int routing, addr; int res; res = sscanf(buf, "0x%X 0x%X", &routing, &addr); if (res != 2) return -EINVAL; if (routing > B43_MAX_SHM_ROUTING) return -EADDRNOTAVAIL; if (addr > B43_MAX_SHM_ADDR) return -EADDRNOTAVAIL; if (routing == B43_SHM_SHARED) { if ((addr % 2) != 0) return -EADDRNOTAVAIL; } dev->dfsentry->shm16read_routing_next = routing; dev->dfsentry->shm16read_addr_next = addr; return 0; }

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static int shm16write__write_file(struct b43_wldev *dev, const char *buf, size_t count) { unsigned int routing, addr, mask, set; u16 val; int res; res = sscanf(buf, "0x%X 0x%X 0x%X 0x%X", &routing, &addr, &mask, &set); if (res != 4) return -EINVAL; if (routing > B43_MAX_SHM_ROUTING) return -EADDRNOTAVAIL; if (addr > B43_MAX_SHM_ADDR) return -EADDRNOTAVAIL; if (routing == B43_SHM_SHARED) { if ((addr % 2) != 0) return -EADDRNOTAVAIL; } if ((mask > 0xFFFF) || (set > 0xFFFF)) return -E2BIG; if (mask == 0) val = 0; else val = b43_shm_read16(dev, routing, addr); val &= mask; val |= set; b43_shm_write16(dev, routing, addr, val); return 0; }

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static ssize_t shm32read__read_file(struct b43_wldev *dev, char *buf, size_t bufsize) { ssize_t count = 0; unsigned int routing, addr; u32 val; routing = dev->dfsentry->shm32read_routing_next; addr = dev->dfsentry->shm32read_addr_next; if ((routing > B43_MAX_SHM_ROUTING) || (addr > B43_MAX_SHM_ADDR)) return -EDESTADDRREQ; val = b43_shm_read32(dev, routing, addr); fappend("0x%08X\n", val); return count; }

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static int shm32read__write_file(struct b43_wldev *dev, const char *buf, size_t count) { unsigned int routing, addr; int res; res = sscanf(buf, "0x%X 0x%X", &routing, &addr); if (res != 2) return -EINVAL; if (routing > B43_MAX_SHM_ROUTING) return -EADDRNOTAVAIL; if (addr > B43_MAX_SHM_ADDR) return -EADDRNOTAVAIL; if (routing == B43_SHM_SHARED) { if ((addr % 2) != 0) return -EADDRNOTAVAIL; } dev->dfsentry->shm32read_routing_next = routing; dev->dfsentry->shm32read_addr_next = addr; return 0; }

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static int shm32write__write_file(struct b43_wldev *dev, const char *buf, size_t count) { unsigned int routing, addr, mask, set; u32 val; int res; res = sscanf(buf, "0x%X 0x%X 0x%X 0x%X", &routing, &addr, &mask, &set); if (res != 4) return -EINVAL; if (routing > B43_MAX_SHM_ROUTING) return -EADDRNOTAVAIL; if (addr > B43_MAX_SHM_ADDR) return -EADDRNOTAVAIL; if (routing == B43_SHM_SHARED) { if ((addr % 2) != 0) return -EADDRNOTAVAIL; } if ((mask > 0xFFFFFFFF) || (set > 0xFFFFFFFF)) return -E2BIG; if (mask == 0) val = 0; else val = b43_shm_read32(dev, routing, addr); val &= mask; val |= set; b43_shm_write32(dev, routing, addr, val); return 0; }

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/* The biggest MMIO address that we allow access to from the debugfs files. */ #define B43_MAX_MMIO_ACCESS (0xF00 - 1)
static ssize_t mmio16read__read_file(struct b43_wldev *dev, char *buf, size_t bufsize) { ssize_t count = 0; unsigned int addr; u16 val; addr = dev->dfsentry->mmio16read_next; if (addr > B43_MAX_MMIO_ACCESS) return -EDESTADDRREQ; val = b43_read16(dev, addr); fappend("0x%04X\n", val); return count; }

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static int mmio16read__write_file(struct b43_wldev *dev, const char *buf, size_t count) { unsigned int addr; int res; res = sscanf(buf, "0x%X", &addr); if (res != 1) return -EINVAL; if (addr > B43_MAX_MMIO_ACCESS) return -EADDRNOTAVAIL; if ((addr % 2) != 0) return -EINVAL; dev->dfsentry->mmio16read_next = addr; return 0; }

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static int mmio16write__write_file(struct b43_wldev *dev, const char *buf, size_t count) { unsigned int addr, mask, set; int res; u16 val; res = sscanf(buf, "0x%X 0x%X 0x%X", &addr, &mask, &set); if (res != 3) return -EINVAL; if (addr > B43_MAX_MMIO_ACCESS) return -EADDRNOTAVAIL; if ((mask > 0xFFFF) || (set > 0xFFFF)) return -E2BIG; if ((addr % 2) != 0) return -EINVAL; if (mask == 0) val = 0; else val = b43_read16(dev, addr); val &= mask; val |= set; b43_write16(dev, addr, val); return 0; }

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static ssize_t mmio32read__read_file(struct b43_wldev *dev, char *buf, size_t bufsize) { ssize_t count = 0; unsigned int addr; u32 val; addr = dev->dfsentry->mmio32read_next; if (addr > B43_MAX_MMIO_ACCESS) return -EDESTADDRREQ; val = b43_read32(dev, addr); fappend("0x%08X\n", val); return count; }

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static int mmio32read__write_file(struct b43_wldev *dev, const char *buf, size_t count) { unsigned int addr; int res; res = sscanf(buf, "0x%X", &addr); if (res != 1) return -EINVAL; if (addr > B43_MAX_MMIO_ACCESS) return -EADDRNOTAVAIL; if ((addr % 4) != 0) return -EINVAL; dev->dfsentry->mmio32read_next = addr; return 0; }

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static int mmio32write__write_file(struct b43_wldev *dev, const char *buf, size_t count) { unsigned int addr, mask, set; int res; u32 val; res = sscanf(buf, "0x%X 0x%X 0x%X", &addr, &mask, &set); if (res != 3) return -EINVAL; if (addr > B43_MAX_MMIO_ACCESS) return -EADDRNOTAVAIL; if ((mask > 0xFFFFFFFF) || (set > 0xFFFFFFFF)) return -E2BIG; if ((addr % 4) != 0) return -EINVAL; if (mask == 0) val = 0; else val = b43_read32(dev, addr); val &= mask; val |= set; b43_write32(dev, addr, val); return 0; }

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static ssize_t txstat_read_file(struct b43_wldev *dev, char *buf, size_t bufsize) { struct b43_txstatus_log *log = &dev->dfsentry->txstatlog; ssize_t count = 0; int i, idx; struct b43_txstatus *stat; if (log->end < 0) { fappend("Nothing transmitted, yet\n"); goto out; } fappend("b43 TX status reports:\n\n" "index | cookie | seq | phy_stat | frame_count | " "rts_count | supp_reason | pm_indicated | " "intermediate | for_ampdu | acked\n" "---\n"); i = log->end + 1; idx = 0; while (1) { if (i == B43_NR_LOGGED_TXSTATUS) i = 0; stat = &(log->log[i]); if (stat->cookie) { fappend("%03d | " "0x%04X | 0x%04X | 0x%02X | " "0x%X | 0x%X | " "%u | %u | " "%u | %u | %u\n", idx, stat->cookie, stat->seq, stat->phy_stat, stat->frame_count, stat->rts_count, stat->supp_reason, stat->pm_indicated, stat->intermediate, stat->for_ampdu, stat->acked); idx++; } if (i == log->end) break; i++; } out: return count; }

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static int restart_write_file(struct b43_wldev *dev, const char *buf, size_t count) { int err = 0; if (count > 0 && buf[0] == '1') { b43_controller_restart(dev, "manually restarted"); } else err = -EINVAL; return err; }

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static unsigned long calc_expire_secs(unsigned long now, unsigned long time, unsigned long expire) { expire = time + expire; if (time_after(now, expire)) return 0; /* expired */ if (expire < now) { /* jiffies wrapped */ expire -= MAX_JIFFY_OFFSET; now -= MAX_JIFFY_OFFSET; } B43_WARN_ON(expire < now); return (expire - now) / HZ; }

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static ssize_t loctls_read_file(struct b43_wldev *dev, char *buf, size_t bufsize) { ssize_t count = 0; struct b43_txpower_lo_control *lo; int i, err = 0; struct b43_lo_calib *cal; unsigned long now = jiffies; struct b43_phy *phy = &dev->phy; if (phy->type != B43_PHYTYPE_G) { fappend("Device is not a G-PHY\n"); err = -ENODEV; goto out; } lo = phy->g->lo_control; fappend("-- Local Oscillator calibration data --\n\n"); fappend("HW-power-control enabled: %d\n", dev->phy.hardware_power_control); fappend("TX Bias: 0x%02X, TX Magn: 0x%02X (expire in %lu sec)\n", lo->tx_bias, lo->tx_magn, calc_expire_secs(now, lo->txctl_measured_time, B43_LO_TXCTL_EXPIRE)); fappend("Power Vector: 0x%08X%08X (expires in %lu sec)\n", (unsigned int)((lo->power_vector & 0xFFFFFFFF00000000ULL) >> 32), (unsigned int)(lo->power_vector & 0x00000000FFFFFFFFULL), calc_expire_secs(now, lo->pwr_vec_read_time, B43_LO_PWRVEC_EXPIRE)); fappend("\nCalibrated settings:\n"); list_for_each_entry(cal, &lo->calib_list, list) { bool active; active = (b43_compare_bbatt(&cal->bbatt, &phy->g->bbatt) && b43_compare_rfatt(&cal->rfatt, &phy->g->rfatt)); fappend("BB(%d), RF(%d,%d) -> I=%d, Q=%d " "(expires in %lu sec)%s\n", cal->bbatt.att, cal->rfatt.att, cal->rfatt.with_padmix, cal->ctl.i, cal->ctl.q, calc_expire_secs(now, cal->calib_time, B43_LO_CALIB_EXPIRE), active ? " ACTIVE" : ""); } fappend("\nUsed RF attenuation values: Value(WithPadmix flag)\n"); for (i = 0; i < lo->rfatt_list.len; i++) { fappend("%u(%d), ", lo->rfatt_list.list[i].att, lo->rfatt_list.list[i].with_padmix); } fappend("\n"); fappend("\nUsed Baseband attenuation values:\n"); for (i = 0; i < lo->bbatt_list.len; i++) { fappend("%u, ", lo->bbatt_list.list[i].att); } fappend("\n"); out: return err ? err : count; }

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#undef fappend
static ssize_t b43_debugfs_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { struct b43_wldev *dev; struct b43_debugfs_fops *dfops; struct b43_dfs_file *dfile; ssize_t uninitialized_var(ret); char *buf; const size_t bufsize = 1024 * 16; /* 16 kiB buffer */ const size_t buforder = get_order(bufsize); int err = 0; if (!count) return 0; dev = file->private_data; if (!dev) return -ENODEV; mutex_lock(&dev->wl->mutex); if (b43_status(dev) < B43_STAT_INITIALIZED) { err = -ENODEV; goto out_unlock; } dfops = container_of(debugfs_real_fops(file), struct b43_debugfs_fops, fops); if (!dfops->read) { err = -ENOSYS; goto out_unlock; } dfile = fops_to_dfs_file(dev, dfops); if (!dfile->buffer) { buf = (char *)__get_free_pages(GFP_KERNEL, buforder); if (!buf) { err = -ENOMEM; goto out_unlock; } memset(buf, 0, bufsize); ret = dfops->read(dev, buf, bufsize); if (ret <= 0) { free_pages((unsigned long)buf, buforder); err = ret; goto out_unlock; } dfile->data_len = ret; dfile->buffer = buf; } ret = simple_read_from_buffer(userbuf, count, ppos, dfile->buffer, dfile->data_len); if (*ppos >= dfile->data_len) { free_pages((unsigned long)dfile->buffer, buforder); dfile->buffer = NULL; dfile->data_len = 0; } out_unlock: mutex_unlock(&dev->wl->mutex); return err ? err : ret; }

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static ssize_t b43_debugfs_write(struct file *file, const char __user *userbuf, size_t count, loff_t *ppos) { struct b43_wldev *dev; struct b43_debugfs_fops *dfops; char *buf; int err = 0; if (!count) return 0; if (count > PAGE_SIZE) return -E2BIG; dev = file->private_data; if (!dev) return -ENODEV; mutex_lock(&dev->wl->mutex); if (b43_status(dev) < B43_STAT_INITIALIZED) { err = -ENODEV; goto out_unlock; } dfops = container_of(debugfs_real_fops(file), struct b43_debugfs_fops, fops); if (!dfops->write) { err = -ENOSYS; goto out_unlock; } buf = (char *)get_zeroed_page(GFP_KERNEL); if (!buf) { err = -ENOMEM; goto out_unlock; } if (copy_from_user(buf, userbuf, count)) { err = -EFAULT; goto out_freepage; } err = dfops->write(dev, buf, count); if (err) goto out_freepage; out_freepage: free_page((unsigned long)buf); out_unlock: mutex_unlock(&dev->wl->mutex); return err ? err : count; }

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#define B43_DEBUGFS_FOPS(name, _read, _write) \ static struct b43_debugfs_fops fops_##name = { \ .read = _read, \ .write = _write, \ .fops = { \ .open = simple_open, \ .read = b43_debugfs_read, \ .write = b43_debugfs_write, \ .llseek = generic_file_llseek, \ }, \ .file_struct_offset = offsetof(struct b43_dfsentry, \ file_##name), \ } B43_DEBUGFS_FOPS(shm16read, shm16read__read_file, shm16read__write_file); B43_DEBUGFS_FOPS(shm16write, NULL, shm16write__write_file); B43_DEBUGFS_FOPS(shm32read, shm32read__read_file, shm32read__write_file); B43_DEBUGFS_FOPS(shm32write, NULL, shm32write__write_file); B43_DEBUGFS_FOPS(mmio16read, mmio16read__read_file, mmio16read__write_file); B43_DEBUGFS_FOPS(mmio16write, NULL, mmio16write__write_file); B43_DEBUGFS_FOPS(mmio32read, mmio32read__read_file, mmio32read__write_file); B43_DEBUGFS_FOPS(mmio32write, NULL, mmio32write__write_file); B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL); B43_DEBUGFS_FOPS(restart, NULL, restart_write_file); B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL);
bool b43_debug(struct b43_wldev *dev, enum b43_dyndbg feature) { bool enabled; enabled = (dev->dfsentry && dev->dfsentry->dyn_debug[feature]); if (unlikely(enabled)) { /* Force full debugging messages, if the user enabled * some dynamic debugging feature. */ b43_modparam_verbose = B43_VERBOSITY_MAX; } return enabled; }

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static void b43_remove_dynamic_debug(struct b43_wldev *dev) { struct b43_dfsentry *e = dev->dfsentry; int i; for (i = 0; i < __B43_NR_DYNDBG; i++) debugfs_remove(e->dyn_debug_dentries[i]); }

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static void b43_add_dynamic_debug(struct b43_wldev *dev) { struct b43_dfsentry *e = dev->dfsentry; struct dentry *d; #define add_dyn_dbg(name, id, initstate) do { \ e->dyn_debug[id] = (initstate); \ d = debugfs_create_bool(name, 0600, e->subdir, \ &(e->dyn_debug[id])); \ if (!IS_ERR(d)) \ e->dyn_debug_dentries[id] = d; \ } while (0) add_dyn_dbg("debug_xmitpower", B43_DBG_XMITPOWER, false); add_dyn_dbg("debug_dmaoverflow", B43_DBG_DMAOVERFLOW, false); add_dyn_dbg("debug_dmaverbose", B43_DBG_DMAVERBOSE, false); add_dyn_dbg("debug_pwork_fast", B43_DBG_PWORK_FAST, false); add_dyn_dbg("debug_pwork_stop", B43_DBG_PWORK_STOP, false); add_dyn_dbg("debug_lo", B43_DBG_LO, false); add_dyn_dbg("debug_firmware", B43_DBG_FIRMWARE, false); add_dyn_dbg("debug_keys", B43_DBG_KEYS, false); add_dyn_dbg("debug_verbose_stats", B43_DBG_VERBOSESTATS, false); #undef add_dyn_dbg }

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void b43_debugfs_add_device(struct b43_wldev *dev) { struct b43_dfsentry *e; struct b43_txstatus_log *log; char devdir[16]; B43_WARN_ON(!dev); e = kzalloc(sizeof(*e), GFP_KERNEL); if (!e) { b43err(dev->wl, "debugfs: add device OOM\n"); return; } e->dev = dev; log = &e->txstatlog; log->log = kcalloc(B43_NR_LOGGED_TXSTATUS, sizeof(struct b43_txstatus), GFP_KERNEL); if (!log->log) { b43err(dev->wl, "debugfs: add device txstatus OOM\n"); kfree(e); return; } log->end = -1; dev->dfsentry = e; snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy)); e->subdir = debugfs_create_dir(devdir, rootdir); if (!e->subdir || IS_ERR(e->subdir)) { if (e->subdir == ERR_PTR(-ENODEV)) { b43dbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not " "enabled in kernel config\n"); } else { b43err(dev->wl, "debugfs: cannot create %s directory\n", devdir); } dev->dfsentry = NULL; kfree(log->log); kfree(e); return; } e->mmio16read_next = 0xFFFF; /* invalid address */ e->mmio32read_next = 0xFFFF; /* invalid address */ e->shm16read_routing_next = 0xFFFFFFFF; /* invalid routing */ e->shm16read_addr_next = 0xFFFFFFFF; /* invalid address */ e->shm32read_routing_next = 0xFFFFFFFF; /* invalid routing */ e->shm32read_addr_next = 0xFFFFFFFF; /* invalid address */ #define ADD_FILE(name, mode) \ do { \ struct dentry *d; \ d = debugfs_create_file(__stringify(name), \ mode, e->subdir, dev, \ &fops_##name.fops); \ e->file_##name.dentry = NULL; \ if (!IS_ERR(d)) \ e->file_##name.dentry = d; \ } while (0) ADD_FILE(shm16read, 0600); ADD_FILE(shm16write, 0200); ADD_FILE(shm32read, 0600); ADD_FILE(shm32write, 0200); ADD_FILE(mmio16read, 0600); ADD_FILE(mmio16write, 0200); ADD_FILE(mmio32read, 0600); ADD_FILE(mmio32write, 0200); ADD_FILE(txstat, 0400); ADD_FILE(restart, 0200); ADD_FILE(loctls, 0400); #undef ADD_FILE b43_add_dynamic_debug(dev); }

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void b43_debugfs_remove_device(struct b43_wldev *dev) { struct b43_dfsentry *e; if (!dev) return; e = dev->dfsentry; if (!e) return; b43_remove_dynamic_debug(dev); debugfs_remove(e->file_shm16read.dentry); debugfs_remove(e->file_shm16write.dentry); debugfs_remove(e->file_shm32read.dentry); debugfs_remove(e->file_shm32write.dentry); debugfs_remove(e->file_mmio16read.dentry); debugfs_remove(e->file_mmio16write.dentry); debugfs_remove(e->file_mmio32read.dentry); debugfs_remove(e->file_mmio32write.dentry); debugfs_remove(e->file_txstat.dentry); debugfs_remove(e->file_restart.dentry); debugfs_remove(e->file_loctls.dentry); debugfs_remove(e->subdir); kfree(e->txstatlog.log); kfree(e); }

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void b43_debugfs_log_txstat(struct b43_wldev *dev, const struct b43_txstatus *status) { struct b43_dfsentry *e = dev->dfsentry; struct b43_txstatus_log *log; struct b43_txstatus *cur; int i; if (!e) return; log = &e->txstatlog; i = log->end + 1; if (i == B43_NR_LOGGED_TXSTATUS) i = 0; log->end = i; cur = &(log->log[i]); memcpy(cur, status, sizeof(*cur)); }

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void b43_debugfs_init(void) { rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL); if (IS_ERR(rootdir)) rootdir = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Michael Büsch27100.00%1100.00%
Total27100.00%1100.00%


void b43_debugfs_exit(void) { debugfs_remove(rootdir); }

Contributors

PersonTokensPropCommitsCommitProp
Michael Büsch12100.00%1100.00%
Total12100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Michael Büsch373999.49%1477.78%
Viresh Kumar90.24%15.56%
Christian Lamparter60.16%15.56%
Frank Lichtenheld30.08%15.56%
Stephen Boyd10.03%15.56%
Total3758100.00%18100.00%
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