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d3622099c7
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Chris Wilson d3622099c7 drm/i915/gtt: Always acquire struct_mutex for gen6_ppgtt_cleanup 
We rearranged the vm_destroy_ioctl to avoid taking struct_mutex, little
realising that buried underneath the gen6 ppgtt release path was a
struct_mutex requirement (to remove its GGTT vma). Until that
struct_mutex is vanquished, take a detour in gen6_ppgtt_cleanup to do
the i915_vma_destroy from inside a worker under the struct_mutex.

<4> [257.740160] WARN_ON(debug_locks && !lock_is_held(&(&vma->vm->i915->drm.struct_mutex)->dep_map))
<4> [257.740213] WARNING: CPU: 3 PID: 1507 at drivers/gpu/drm/i915/i915_vma.c:841 i915_vma_destroy+0x1ae/0x3a0 [i915]
<4> [257.740214] Modules linked in: snd_hda_codec_hdmi i915 x86_pkg_temp_thermal mei_hdcp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core r8169 realtek snd_pcm mei_me mei prime_numbers lpc_ich
<4> [257.740224] CPU: 3 PID: 1507 Comm: gem_vm_create Tainted: G     U            5.2.0-rc1-CI-CI_DRM_6118+ #1
<4> [257.740225] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4> [257.740249] RIP: 0010:i915_vma_destroy+0x1ae/0x3a0 [i915]
<4> [257.740250] Code: 00 00 00 48 81 c7 c8 00 00 00 e8 ed 08 f0 e0 85 c0 0f 85 78 fe ff ff 48 c7 c6 e8 ec 30 a0 48 c7 c7 da 55 33 a0 e8 42 8c e9 e0 <0f> 0b 8b 83 40 01 00 00 85 c0 0f 84 63 fe ff ff 48 c7 c1 c1 58 33
<4> [257.740251] RSP: 0018:ffffc90000aafc68 EFLAGS: 00010282
<4> [257.740252] RAX: 0000000000000000 RBX: ffff8883f7957840 RCX: 0000000000000003
<4> [257.740253] RDX: 0000000000000046 RSI: 0000000000000006 RDI: ffffffff8212d1b9
<4> [257.740254] RBP: ffffc90000aafcc8 R08: 0000000000000000 R09: 0000000000000000
<4> [257.740255] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8883f4d5c2a8
<4> [257.740256] R13: ffff8883f4d5d680 R14: ffff8883f4d5c668 R15: ffff8883f4d5c2f0
<4> [257.740257] FS:  00007f777fa8fe40(0000) GS:ffff88840f780000(0000) knlGS:0000000000000000
<4> [257.740258] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [257.740259] CR2: 00007f777f6522b0 CR3: 00000003c612a006 CR4: 00000000001606e0
<4> [257.740260] Call Trace:
<4> [257.740283]  gen6_ppgtt_cleanup+0x25/0x60 [i915]
<4> [257.740306]  i915_ppgtt_release+0x102/0x290 [i915]
<4> [257.740330]  i915_gem_vm_destroy_ioctl+0x7c/0xa0 [i915]
<4> [257.740376]  ? i915_gem_vm_create_ioctl+0x160/0x160 [i915]
<4> [257.740379]  drm_ioctl_kernel+0x83/0xf0
<4> [257.740382]  drm_ioctl+0x2f3/0x3b0
<4> [257.740422]  ? i915_gem_vm_create_ioctl+0x160/0x160 [i915]
<4> [257.740426]  ? _raw_spin_unlock_irqrestore+0x39/0x60
<4> [257.740430]  do_vfs_ioctl+0xa0/0x6e0
<4> [257.740433]  ? lock_acquire+0xa6/0x1c0
<4> [257.740436]  ? __task_pid_nr_ns+0xb9/0x1f0
<4> [257.740439]  ksys_ioctl+0x35/0x60
<4> [257.740441]  __x64_sys_ioctl+0x11/0x20
<4> [257.740443]  do_syscall_64+0x55/0x1c0
<4> [257.740445]  entry_SYSCALL_64_after_hwframe+0x49/0xbe

References: e0695db729 ("drm/i915: Create/destroy VM (ppGTT) for use with contexts")
Fixes: 7f3f317a66 ("drm/i915: Restore control over ppgtt for context creation ABI")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190523064933.23604-1-chris@chris-wilson.co.uk
2019-05-23 21:12:12 +01:00
arch Merge tag 'drm-intel-next-2019-04-17' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2019-04-24 10:02:20 +10:00
block block: do not leak memory in bio_copy_user_iov() 2019-04-10 16:14:40 -06:00
certs kexec, KEYS: Make use of platform keyring for signature verify 2019-02-04 17:34:07 -05:00
crypto lib/lzo: separate lzo-rle from lzo 2019-03-07 18:32:03 -08:00
Documentation drm: revocation check at drm subsystem 2019-05-09 09:44:41 +02:00
drivers drm/i915/gtt: Always acquire struct_mutex for gen6_ppgtt_cleanup 2019-05-23 21:12:12 +01:00
fs Merge branch 'page-refs' (page ref overflow) 2019-04-14 15:09:40 -07:00
include drm: Rename struct edp_vsc_psr to struct dp_sdp 2019-05-23 09:49:32 +03:00
init init/main: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
ipc Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-03-12 14:08:19 -07:00
kernel Merge branch 'page-refs' (page ref overflow) 2019-04-14 15:09:40 -07:00
lib Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-04-09 16:20:59 -10:00
LICENSES LICENSES: Add GCC runtime library exception text 2019-01-16 14:54:15 -07:00
mm Merge branch 'page-refs' (page ref overflow) 2019-04-14 15:09:40 -07:00
net Revert "SUNRPC: Micro-optimise when the task is known not to be sleeping" 2019-04-11 15:41:14 -04:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-03-11 08:54:01 -07:00
scripts fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock 2019-04-06 07:01:55 -10:00
security apparmor: Restore Y/N in /sys for apparmor's "enabled" 2019-04-10 04:24:48 -07:00
sound Linux 5.1-rc5 2019-04-15 15:51:49 +10:00
tools for-linus-20190412 2019-04-13 16:23:16 -07:00
usr user/Makefile: Fix typo and capitalization in comment section 2018-12-11 00:18:03 +09:00
virt KVM/ARM fixes for 5.1 2019-03-28 19:07:30 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2019-04-12 12:49:54 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: Add support for DT binding schema checks 2018-12-13 09:41:32 -06:00
.mailmap Update Nicolas Pitre's email address 2019-04-02 18:12:44 -10:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS Char/Misc driver patches for 5.1-rc1 2019-03-06 14:18:59 -08:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS drm-misc-next for v5.2: 2019-04-24 10:12:50 +10:00
Makefile Linux 5.1-rc5 2019-04-14 15:17:41 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

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.