/* * SHA-1 implementation for PowerPC. * * Copyright (C) 2005 Paul Mackerras */ #include #include /* * We roll the registers for T, A, B, C, D, E around on each * iteration; T on iteration t is A on iteration t+1, and so on. * We use registers 7 - 12 for this. */ #define RT(t) ((((t)+5)%6)+7) #define RA(t) ((((t)+4)%6)+7) #define RB(t) ((((t)+3)%6)+7) #define RC(t) ((((t)+2)%6)+7) #define RD(t) ((((t)+1)%6)+7) #define RE(t) ((((t)+0)%6)+7) /* We use registers 16 - 31 for the W values */ #define W(t) (((t)%16)+16) #define LOADW(t) \ lwz W(t),(t)*4(r4) #define STEPD0_LOAD(t) \ andc r0,RD(t),RB(t); \ and r6,RB(t),RC(t); \ rotlwi RT(t),RA(t),5; \ or r6,r6,r0; \ add r0,RE(t),r15; \ add RT(t),RT(t),r6; \ add r14,r0,W(t); \ lwz W((t)+4),((t)+4)*4(r4); \ rotlwi RB(t),RB(t),30; \ add RT(t),RT(t),r14 #define STEPD0_UPDATE(t) \ and r6,RB(t),RC(t); \ andc r0,RD(t),RB(t); \ rotlwi RT(t),RA(t),5; \ rotlwi RB(t),RB(t),30; \ or r6,r6,r0; \ add r0,RE(t),r15; \ xor r5,W((t)+4-3),W((t)+4-8); \ add RT(t),RT(t),r6; \ xor W((t)+4),W((t)+4-16),W((t)+4-14); \ add r0,r0,W(t); \ xor W((t)+4),W((t)+4),r5; \ add RT(t),RT(t),r0; \ rotlwi W((t)+4),W((t)+4),1 #define STEPD1(t) \ xor r6,RB(t),RC(t); \ rotlwi RT(t),RA(t),5; \ rotlwi RB(t),RB(t),30; \ xor r6,r6,RD(t); \ add r0,RE(t),r15; \ add RT(t),RT(t),r6; \ add r0,r0,W(t); \ add RT(t),RT(t),r0 #define STEPD1_UPDATE(t) \ xor r6,RB(t),RC(t); \ rotlwi RT(t),RA(t),5; \ rotlwi RB(t),RB(t),30; \ xor r6,r6,RD(t); \ add r0,RE(t),r15; \ xor r5,W((t)+4-3),W((t)+4-8); \ add RT(t),RT(t),r6; \ xor W((t)+4),W((t)+4-16),W((t)+4-14); \ add r0,r0,W(t); \ xor W((t)+4),W((t)+4),r5; \ add RT(t),RT(t),r0; \ rotlwi W((t)+4),W((t)+4),1 #define STEPD2_UPDATE(t) \ and r6,RB(t),RC(t); \ and r0,RB(t),RD(t); \ rotlwi RT(t),RA(t),5; \ or r6,r6,r0; \ rotlwi RB(t),RB(t),30; \ and r0,RC(t),RD(t); \ xor r5,W((t)+4-3),W((t)+4-8); \ or r6,r6,r0; \ xor W((t)+4),W((t)+4-16),W((t)+4-14); \ add r0,RE(t),r15; \ add RT(t),RT(t),r6; \ add r0,r0,W(t); \ xor W((t)+4),W((t)+4),r5; \ add RT(t),RT(t),r0; \ rotlwi W((t)+4),W((t)+4),1 #define STEP0LD4(t) \ STEPD0_LOAD(t); \ STEPD0_LOAD((t)+1); \ STEPD0_LOAD((t)+2); \ STEPD0_LOAD((t)+3) #define STEPUP4(t, fn) \ STEP##fn##_UPDATE(t); \ STEP##fn##_UPDATE((t)+1); \ STEP##fn##_UPDATE((t)+2); \ STEP##fn##_UPDATE((t)+3) #define STEPUP20(t, fn) \ STEPUP4(t, fn); \ STEPUP4((t)+4, fn); \ STEPUP4((t)+8, fn); \ STEPUP4((t)+12, fn); \ STEPUP4((t)+16, fn) _GLOBAL(powerpc_sha_transform) PPC_STLU r1,-INT_FRAME_SIZE(r1) SAVE_8GPRS(14, r1) SAVE_10GPRS(22, r1) /* Load up A - E */ lwz RA(0),0(r3) /* A */ lwz RB(0),4(r3) /* B */ lwz RC(0),8(r3) /* C */ lwz RD(0),12(r3) /* D */ lwz RE(0),16(r3) /* E */ LOADW(0) LOADW(1) LOADW(2) LOADW(3) lis r15,0x5a82 /* K0-19 */ ori r15,r15,0x7999 STEP0LD4(0) STEP0LD4(4) STEP0LD4(8) STEPUP4(12, D0) STEPUP4(16, D0) lis r15,0x6ed9 /* K20-39 */ ori r15,r15,0xeba1 STEPUP20(20, D1) lis r15,0x8f1b /* K40-59 */ ori r15,r15,0xbcdc STEPUP20(40, D2) lis r15,0xca62 /* K60-79 */ ori r15,r15,0xc1d6 STEPUP4(60, D1) STEPUP4(64, D1) STEPUP4(68, D1) STEPUP4(72, D1) lwz r20,16(r3) STEPD1(76) lwz r19,12(r3) STEPD1(77) lwz r18,8(r3) STEPD1(78) lwz r17,4(r3) STEPD1(79) lwz r16,0(r3) add r20,RE(80),r20 add RD(0),RD(80),r19 add RC(0),RC(80),r18 add RB(0),RB(80),r17 add RA(0),RA(80),r16 mr RE(0),r20 stw RA(0),0(r3) stw RB(0),4(r3) stw RC(0),8(r3) stw RD(0),12(r3) stw RE(0),16(r3) REST_8GPRS(14, r1) REST_10GPRS(22, r1) addi r1,r1,INT_FRAME_SIZE blr 15space:mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-29 13:50:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-29 13:50:06 -0800
commit39cb2c9a316e77f6dfba96c543e55b6672d5a37e (patch)
tree98fe974ee4e20121253de7f61fc8d01bdb3821c1 /tools/perf/Makefile.config
parent2c5d9555d6d937966d79d4c6529a5f7b9206e405 (diff)
drm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()
I've seen this trigger twice now, where the i915_gem_object_to_ggtt() call in intel_unpin_fb_obj() returns NULL, resulting in an oops immediately afterwards as the (inlined) call to i915_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/perf/Makefile.config')