[PATCH 2/4] drm: Add dispatcher and driver identification for DRM
Patrik Jakobsson
patrik.jakobsson at linux.intel.com
Tue Jun 9 14:35:02 UTC 2015
On Tue, Jun 09, 2015 at 03:51:10PM +0200, Gabriel Laskar wrote:
> On Tue, 9 Jun 2015 13:26:42 +0200
> Patrik Jakobsson <patrik.jakobsson at linux.intel.com> wrote:
>
> > Signed-off-by: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
> > ---
> > Makefile.am | 1 +
> > defs.h | 6 ++++-
> > drm.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > io.c | 2 +-
> > ioctl.c | 13 ++++++++-
> > 5 files changed, 107 insertions(+), 3 deletions(-)
> > create mode 100644 drm.c
> >
> > diff --git a/Makefile.am b/Makefile.am
> > index 549aebc..50d5140 100644
> > --- a/Makefile.am
> > +++ b/Makefile.am
> > @@ -121,6 +121,7 @@ strace_SOURCES = \
> > utime.c \
> > utimes.c \
> > v4l2.c \
> > + drm.c \
> > vsprintf.c \
> > wait.c \
> > xattr.c
>
> If I remember correctly source files were sorted in alphabetic order.
> Same remark for drm_i915.c in the next patch.
>
> (This is nitpicking)
Ah yes, totally unacceptable ;). Will fix.
>
> > diff --git a/defs.h b/defs.h
> > index 77c819c..f77330b 100644
> > --- a/defs.h
> > +++ b/defs.h
> > @@ -559,7 +559,7 @@ extern const struct_ioctlent *ioctl_lookup(const unsigned int);
> > extern const struct_ioctlent *ioctl_next_match(const struct_ioctlent *);
> > extern void ioctl_print_code(const unsigned int);
> > extern int ioctl_decode(struct tcb *, const unsigned int, long);
> > -extern int ioctl_decode_command_number(const unsigned int);
> > +extern int ioctl_decode_command_number(struct tcb *, const unsigned int);
> > extern int block_ioctl(struct tcb *, const unsigned int, long);
> > extern int evdev_ioctl(struct tcb *, const unsigned int, long);
> > extern int loop_ioctl(struct tcb *, const unsigned int, long);
> > @@ -572,6 +572,10 @@ extern int term_ioctl(struct tcb *, const unsigned int, long);
> > extern int ubi_ioctl(struct tcb *, const unsigned int, long);
> > extern int v4l2_ioctl(struct tcb *, const unsigned int, long);
> >
> > +extern int drm_is_priv(const unsigned int);
> > +extern int drm_is_driver(struct tcb *tcp, const char *name);
> > +extern int drm_ioctl(struct tcb *, const unsigned int, long);
> > +
> > extern int tv_nz(const struct timeval *);
> > extern int tv_cmp(const struct timeval *, const struct timeval *);
> > extern double tv_float(const struct timeval *);
> > diff --git a/drm.c b/drm.c
> > new file mode 100644
> > index 0000000..56ef98b
> > --- /dev/null
> > +++ b/drm.c
> > @@ -0,0 +1,88 @@
> > +/*
> > + * Copyright (c) 2015 Intel Corporation
> > + * All rights reserved.
> > + *
> > + * Redistribution and use in source and binary forms, with or without
> > + * modification, are permitted provided that the following conditions
> > + * are met:
> > + * 1. Redistributions of source code must retain the above copyright
> > + * notice, this list of conditions and the following disclaimer.
> > + * 2. Redistributions in binary form must reproduce the above copyright
> > + * notice, this list of conditions and the following disclaimer in the
> > + * documentation and/or other materials provided with the distribution.
> > + * 3. The name of the author may not be used to endorse or promote products
> > + * derived from this software without specific prior written permission.
> > + *
> > + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
> > + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
> > + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
> > + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
> > + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
> > + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> > + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> > + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> > + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
> > + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> > + *
> > + * Authors:
> > + * Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
> > + */
> > +
> > +#include "defs.h"
> > +
> > +#include <sys/types.h>
> > +#include <unistd.h>
> > +#include <string.h>
> > +#include <linux/limits.h>
> > +#include <stdint.h>
> > +#include <sys/ioctl.h>
> > +#include <linux/types.h>
> > +#include <drm.h>
>
> If I remember correctly, headers are mostly sorted in strace files also
I'll take a look to see if I can find what pattern to stick with here.
>
> > +
> > +#define DRM_MAX_NAME_LEN 128
> > +
> > +inline int drm_is_priv(const unsigned int num)
> > +{
> > + return (_IOC_NR(num) >= DRM_COMMAND_BASE &&
> > + _IOC_NR(num) < DRM_COMMAND_END);
> > +}
> > +
> > +static int drm_get_driver_name(struct tcb *tcp, char *name, size_t bufsize)
> > +{
> > + char path[PATH_MAX];
> > + char link[PATH_MAX];
> > + int ret;
> > +
> > + ret = getfdpath(tcp, tcp->u_arg[0], path, PATH_MAX - 1);
> > + if (!ret)
> > + return ret;
> > +
> > + snprintf(link, PATH_MAX, "/sys/class/drm/%s/device/driver",
> > + basename(path));
> > +
> > + ret = readlink(link, path, PATH_MAX - 1);
> > + if (ret < 0)
> > + return ret;
> > +
> > + path[ret] = '\0';
> > + strncpy(name, basename(path), bufsize);
> > +
> > + return 0;
> > +}
> > +
> > +int drm_is_driver(struct tcb *tcp, const char *name)
> > +{
> > + char drv[DRM_MAX_NAME_LEN];
> > + int ret;
> > +
> > + ret = drm_get_driver_name(tcp, drv, DRM_MAX_NAME_LEN);
> > + if (ret)
> > + return 0;
> > +
> > + return strcmp(name, drv) == 0;
> > +}
> > +
> > +int drm_ioctl(struct tcb *tcp, const unsigned int code, long arg)
> > +{
> > + return 0;
> > +}
> > diff --git a/io.c b/io.c
> > index 30ed578..6810a45 100644
> > --- a/io.c
> > +++ b/io.c
> > @@ -391,7 +391,7 @@ SYS_FUNC(ioctl)
> > if (entering(tcp)) {
> > printfd(tcp, tcp->u_arg[0]);
> > tprints(", ");
> > - if (!ioctl_decode_command_number(tcp->u_arg[1])) {
> > + if (!ioctl_decode_command_number(tcp, tcp->u_arg[1])) {
> > iop = ioctl_lookup(tcp->u_arg[1]);
> > if (iop) {
> > tprints(iop->symbol);
> > diff --git a/ioctl.c b/ioctl.c
> > index c67d048..690e7aa 100644
> > --- a/ioctl.c
> > +++ b/ioctl.c
> > @@ -181,8 +181,14 @@ hiddev_decode_number(unsigned int arg)
> > return 0;
> > }
> >
> > +static int
> > +drm_decode_number(struct tcb *tcp, unsigned int arg)
> > +{
> > + return 0;
> > +}
> > +
>
> If you push drm_decode_number() inside drm.c you will have less
> function to export, and avoir polluting to much defs.h.
>
> For the other *_decode_number(), there was no files with the specific
> argument decoding attached to it, so it maked sense at that time to not
> have separated files for each of them (this makes me think that for
> evdev ioctls, we could move that part inside evdev.c.)
>
I agree, will do.
> > int
> > -ioctl_decode_command_number(unsigned int arg)
> > +ioctl_decode_command_number(struct tcb *tcp, unsigned int arg)
> > {
> > switch (_IOC_TYPE(arg)) {
> > case 'E':
> > @@ -216,6 +222,8 @@ ioctl_decode_command_number(unsigned int arg)
> > return 1;
> > }
> > return 0;
> > + case 'd':
> > + return drm_decode_number(tcp, arg);
> > default:
> > return 0;
> > }
> > @@ -252,6 +260,8 @@ ioctl_decode(struct tcb *tcp, unsigned int code, long arg)
> > return ubi_ioctl(tcp, code, arg);
> > case 'V':
> > return v4l2_ioctl(tcp, code, arg);
> > + case 'd':
> > + return drm_ioctl(tcp, code, arg);
> > case '=':
> > return ptp_ioctl(tcp, code, arg);
> > #ifdef HAVE_LINUX_INPUT_H
> > @@ -284,6 +294,7 @@ ioctl_decode(struct tcb *tcp, unsigned int code, long arg)
> > * d sys/des.h (possible overlap)
> > * d vax/dkio.h (possible overlap)
> > * d vaxuba/rxreg.h (possible overlap)
> > + * d drm/drm.h
> > * f sys/filio.h
> > * g sunwindow/win_ioctl.h -no overlap-
> > * g sunwindowdev/winioctl.c !no manifest constant! -no overlap-
>
>
>
> --
> Gabriel Laskar
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