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85087083de
when userspace cat /d/dri/0/state, the driver will try to dump gem info
throught obj->funcs->print_info(p, indent, obj), if logo gem object less
funcs init, it will appears the following error:
[ 52.587405][ T2156] pc : drm_gem_print_info+0xcc/0xf8
[ 52.587862][ T2156] lr : drm_gem_print_info+0xc8/0xf8
[ 52.588313][ T2156] sp : ffffffc00e35ba30
[ 52.588664][ T2156] x29: ffffffc00e35ba30 x28: 00000000010e0000 x27:
0000000000000000
[ 52.589358][ T2156] x26: 0000000000000004 x25: ffffff80c0c57150 x24:
000000000000010e
[ 52.590051][ T2156] x23: ffffffc009bcdd48 x22: ffffffc009bcdd48 x21:
ffffffc00e35bba8
[ 52.590744][ T2156] x20: 0000000000000004 x19: ffffff80c5cae0d0 x18:
ffffffc00d92d080
[ 52.591437][ T2156] x17: 0000000000000000 x16: 00000000000000a4 x15:
ffffffc0094a4174
[ 52.592130][ T2156] x14: 0000000000000000 x13: 000000000000004e x12:
ffff0000ffffff00
[ 52.592824][ T2156] x11: 0000000000000000 x10: 0000000000001000 x9 :
4f57b917247aff00
[ 52.593516][ T2156] x8 : 0000000000000000 x7 : 3d646574726f706d x6 :
000000000000000a
[ 52.594209][ T2156] x5 : ffffff80c5f08216 x4 : ffffffc009bbfcb5 x3 :
ffff0a00ffffff04
[ 52.594902][ T2156] x2 : 0000000000000001 x1 : ffffffc009bbfcb4 x0 :
0000000000000010
[ 52.595595][ T2156] Call trace:
[ 52.595882][ T2156] drm_gem_print_info+0xcc/0xf8
[ 52.596301][ T2156] drm_framebuffer_print_info+0x19c/0x2f4
[ 52.596799][ T2156] drm_atomic_plane_print_state+0xb8/0x1d0
[ 52.597305][ T2156] __drm_state_dump+0x7c/0x1a0
[ 52.597714][ T2156] drm_state_info+0x50/0x7c
[ 52.598101][ T2156] seq_read_iter+0x128/0x414
[ 52.598499][ T2156] seq_read+0x90/0xc8
[ 52.598841][ T2156] full_proxy_read+0x6c/0xf4
[ 52.599240][ T2156] vfs_read+0xe8/0x27c
[ 52.599594][ T2156] ksys_read+0x78/0xe4
before the following commit, drm_gem_print_info() function will check obj->funcs confirm is !NULL,
and then call obj->funcs->print_info, this can avoid kernel panic.
commit d693def4fd ("drm: Remove obsolete GEM and PRIME callbacks from struct drm_driver")
https://patchwork.freedesktop.org/patch/391822/
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Change-Id: I7236ac7f3f5475e6446546f069146a3fa0d7f2fe
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.