lindebugfs.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2016-2018, Matthew Macy <mmacy@freebsd.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/queue.h>
   35 #include <sys/blist.h>
   36 #include <sys/conf.h>
   37 #include <sys/exec.h>
   38 #include <sys/filedesc.h>
   39 #include <sys/kernel.h>
   40 #include <sys/linker.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mount.h>
   43 #include <sys/mutex.h>
   44 #include <sys/proc.h>
   45 #include <sys/resourcevar.h>
   46 #include <sys/sbuf.h>
   47 #include <sys/smp.h>
   48 #include <sys/socket.h>
   49 #include <sys/vnode.h>
   50 #include <sys/bus.h>
   51 #include <sys/pciio.h>
   52 
   53 #include <dev/pci/pcivar.h>
   54 #include <dev/pci/pcireg.h>
   55 
   56 #include <net/if.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/pmap.h>
   60 #include <vm/vm_map.h>
   61 #include <vm/vm_param.h>
   62 #include <vm/vm_object.h>
   63 #include <vm/swap_pager.h>
   64 
   65 #include <machine/bus.h>
   66 
   67 #include <compat/linux/linux_ioctl.h>
   68 #include <compat/linux/linux_mib.h>
   69 #include <compat/linux/linux_util.h>
   70 #include <fs/pseudofs/pseudofs.h>
   71 
   72 #include <linux/debugfs.h>
   73 #include <linux/seq_file.h>
   74 #include <linux/compat.h>
   75 
   76 MALLOC_DEFINE(M_DFSINT, "debugfsint", "Linux debugfs internal");
   77 
   78 static struct pfs_node *debugfs_root;
   79 
   80 #define DM_SYMLINK 0x1
   81 #define DM_DIR 0x2
   82 #define DM_FILE 0x3
   83 
   84 struct dentry_meta {
   85         struct dentry dm_dnode;
   86         const struct file_operations *dm_fops;
   87         void *dm_data;
   88         umode_t dm_mode;
   89         int dm_type;
   90 };
   91 
   92 static int
   93 debugfs_attr(PFS_ATTR_ARGS)
   94 {
   95         struct dentry_meta *dm;
   96 
   97         dm = pn->pn_data;
   98 
   99         vap->va_mode = dm->dm_mode;
  100         return (0);
  101 }
  102 
  103 static int
  104 debugfs_destroy(PFS_DESTROY_ARGS)
  105 {
  106         struct dentry_meta *dm;
  107 
  108         dm = pn->pn_data;
  109         if (dm->dm_type == DM_SYMLINK)
  110                 free(dm->dm_data, M_DFSINT);
  111 
  112         free(dm, M_DFSINT);
  113         return (0);
  114 }
  115 
  116 static int
  117 debugfs_fill(PFS_FILL_ARGS)
  118 {
  119         struct dentry_meta *d;
  120         struct linux_file lf;
  121         struct seq_file *sf;
  122         struct vnode vn;
  123         void *buf;
  124         int rc;
  125         size_t len;
  126         off_t off;
  127 
  128         d = pn->pn_data;
  129 
  130         if ((rc = linux_set_current_flags(curthread, M_NOWAIT)))
  131                 return (rc);
  132         vn.v_data = d->dm_data;
  133         buf = uio->uio_iov[0].iov_base;
  134         len = min(uio->uio_iov[0].iov_len, uio->uio_resid);
  135         off = 0;
  136         lf.private_data = NULL;
  137         rc = d->dm_fops->open(&vn, &lf);
  138         if (rc < 0) {
  139 #ifdef INVARIANTS
  140                 printf("%s:%d open failed with %d\n", __FUNCTION__, __LINE__, rc);
  141 #endif
  142                 return (-rc);
  143         }
  144         sf = lf.private_data;
  145         sf->buf = sb;
  146         if (uio->uio_rw == UIO_READ) {
  147                 if (d->dm_fops->read)
  148                         rc = d->dm_fops->read(&lf, NULL, len, &off);
  149                 else
  150                         rc = ENODEV;
  151         } else {
  152                 if (d->dm_fops->write)
  153                         rc = d->dm_fops->write(&lf, buf, len, &off);
  154                 else
  155                         rc = ENODEV;
  156         }
  157         if (d->dm_fops->release)
  158                 d->dm_fops->release(&vn, &lf);
  159         else
  160                 single_release(&vn, &lf);
  161 
  162         if (rc < 0) {
  163 #ifdef INVARIANTS
  164                 printf("%s:%d read/write failed with %d\n", __FUNCTION__, __LINE__, rc);
  165 #endif
  166                 return (-rc);
  167         }
  168         return (0);
  169 }
  170 
  171 static int
  172 debugfs_fill_data(PFS_FILL_ARGS)
  173 {
  174         struct dentry_meta *dm;
  175 
  176         dm = pn->pn_data;
  177         sbuf_printf(sb, "%s", (char *)dm->dm_data);
  178         return (0);
  179 }
  180 
  181 struct dentry *
  182 debugfs_create_file(const char *name, umode_t mode,
  183                     struct dentry *parent, void *data,
  184                     const struct file_operations *fops)
  185 {
  186         struct dentry_meta *dm;
  187         struct dentry *dnode;
  188         struct pfs_node *pnode;
  189         int flags;
  190 
  191         dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
  192         if (dm == NULL)
  193                 return (NULL);
  194         dnode = &dm->dm_dnode;
  195         dm->dm_fops = fops;
  196         dm->dm_data = data;
  197         dm->dm_mode = mode;
  198         dm->dm_type = DM_FILE;
  199         if (parent != NULL)
  200                 pnode = parent->d_pfs_node;
  201         else
  202                 pnode = debugfs_root;
  203 
  204         flags = fops->write ? PFS_RDWR : PFS_RD;
  205         dnode->d_pfs_node = pfs_create_file(pnode, name, debugfs_fill,
  206             debugfs_attr, NULL, debugfs_destroy, flags | PFS_NOWAIT);
  207         if (dnode->d_pfs_node == NULL) {
  208                 free(dm, M_DFSINT);
  209                 return (NULL);
  210         }
  211         dnode->d_pfs_node->pn_data = dm;
  212 
  213         return (dnode);
  214 }
  215 
  216 struct dentry *
  217 debugfs_create_dir(const char *name, struct dentry *parent)
  218 {
  219         struct dentry_meta *dm;
  220         struct dentry *dnode;
  221         struct pfs_node *pnode;
  222 
  223         dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
  224         if (dm == NULL)
  225                 return (NULL);
  226         dnode = &dm->dm_dnode;
  227         dm->dm_mode = 0700;
  228         dm->dm_type = DM_DIR;
  229         if (parent != NULL)
  230                 pnode = parent->d_pfs_node;
  231         else
  232                 pnode = debugfs_root;
  233 
  234         dnode->d_pfs_node = pfs_create_dir(pnode, name, debugfs_attr, NULL, debugfs_destroy, PFS_RD | PFS_NOWAIT);
  235         if (dnode->d_pfs_node == NULL) {
  236                 free(dm, M_DFSINT);
  237                 return (NULL);
  238         }
  239         dnode->d_pfs_node->pn_data = dm;
  240         return (dnode);
  241 }
  242 
  243 struct dentry *
  244 debugfs_create_symlink(const char *name, struct dentry *parent,
  245         const char *dest)
  246 {
  247         struct dentry_meta *dm;
  248         struct dentry *dnode;
  249         struct pfs_node *pnode;
  250         void *data;
  251 
  252         data = strdup_flags(dest, M_DFSINT, M_NOWAIT);
  253         if (data == NULL)
  254                 return (NULL);
  255         dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
  256         if (dm == NULL)
  257                 goto fail1;
  258         dnode = &dm->dm_dnode;
  259         dm->dm_mode = 0700;
  260         dm->dm_type = DM_SYMLINK;
  261         dm->dm_data = data;
  262         if (parent != NULL)
  263                 pnode = parent->d_pfs_node;
  264         else
  265                 pnode = debugfs_root;
  266 
  267         dnode->d_pfs_node = pfs_create_link(pnode, name, &debugfs_fill_data, NULL, NULL, NULL, PFS_NOWAIT);
  268         if (dnode->d_pfs_node == NULL)
  269                 goto fail;
  270         dnode->d_pfs_node->pn_data = dm;
  271         return (dnode);
  272  fail:
  273         free(dm, M_DFSINT);
  274  fail1:
  275         free(data, M_DFSINT);
  276         return (NULL);
  277 }
  278 
  279 void
  280 debugfs_remove(struct dentry *dnode)
  281 {
  282         if (dnode == NULL)
  283                 return;
  284 
  285         pfs_destroy(dnode->d_pfs_node);
  286 }
  287 
  288 void
  289 debugfs_remove_recursive(struct dentry *dnode)
  290 {
  291         if (dnode == NULL)
  292                 return;
  293 
  294         pfs_destroy(dnode->d_pfs_node);
  295 }
  296 
  297 static int
  298 debugfs_init(PFS_INIT_ARGS)
  299 {
  300 
  301         debugfs_root = pi->pi_root;
  302 
  303         (void)debugfs_create_symlink("kcov", NULL, "/dev/kcov");
  304 
  305         return (0);
  306 }
  307 
  308 static int
  309 debugfs_uninit(PFS_INIT_ARGS)
  310 {
  311         return (0);
  312 }
  313 
  314 #ifdef PR_ALLOW_MOUNT_LINSYSFS
  315 PSEUDOFS(debugfs, 1, PR_ALLOW_MOUNT_LINSYSFS);
  316 #else
  317 PSEUDOFS(debugfs, 1, VFCF_JAIL);
  318 #endif
  319 MODULE_DEPEND(lindebugfs, linuxkpi, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/compat/lindebugfs/lindebugfs.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/lindebugfs/lindebugfs.c