1. 01 Dec, 2020 12 commits
  2. 27 Nov, 2020 3 commits
  3. 26 Nov, 2020 1 commit
    • Chris Wilson's avatar
      drm/i915/display: Defer initial modeset until after GGTT is initialised · b3bf99da
      Chris Wilson authored
      Prior to sanitizing the GGTT, the only operations allowed in
      intel_display_init_nogem() are those to reserve the preallocated (and
      active) regions in the GGTT leftover from the BIOS. Trying to allocate a
      GGTT vma (such as intel_pin_and_fence_fb_obj during the initial modeset)
      may then conflict with other preallocated regions that have not yet been
      protected.
      
      Move the initial modesetting from the end of init_nogem to the beginning
      of init so that any vma pinning (either framebuffers or DSB, for example),
      is after the GGTT is ready to handle it.
      
      This will prevent the DSB object from being destroyed too early:
      
      [   53.449241] BUG: KASAN: use-after-free in i915_init_ggtt+0x324/0x9e0 [i915]
      [   53.449309] Read of size 8 at addr ffff88811b1e8070 by task systemd-udevd/345
      
      [   53.449399] CPU: 1 PID: 345 Comm: systemd-udevd Tainted: G        W         5.10.0-rc5+ #12
      [   53.449409] Call Trace:
      [   53.449418]  dump_stack+0x9a/0xcc
      [   53.449558]  ? i915_init_ggtt+0x324/0x9e0 [i915]
      [   53.449565]  print_address_description.constprop.0+0x3e/0x60
      [   53.449577]  ? _raw_spin_lock_irqsave+0x4e/0x50
      [   53.449718]  ? i915_init_ggtt+0x324/0x9e0 [i915]
      [   53.449849]  ? i915_init_ggtt+0x324/0x9e0 [i915]
      [   53.449857]  kasan_report.cold+0x1f/0x37
      [   53.449993]  ? i915_init_ggtt+0x324/0x9e0 [i915]
      [   53.450130]  i915_init_ggtt+0x324/0x9e0 [i915]
      [   53.450273]  ? i915_ggtt_suspend+0x1f0/0x1f0 [i915]
      [   53.450281]  ? static_obj+0x69/0x80
      [   53.450289]  ? lockdep_init_map_waits+0xa9/0x310
      [   53.450431]  ? intel_wopcm_init+0x96/0x3d0 [i915]
      [   53.450581]  ? i915_gem_init+0x75/0x2d0 [i915]
      [   53.450720]  i915_gem_init+0x75/0x2d0 [i915]
      [   53.450852]  i915_driver_probe+0x8c2/0x1210 [i915]
      [   53.450993]  ? i915_pm_prepare+0x630/0x630 [i915]
      [   53.451006]  ? check_chain_key+0x1e7/0x2e0
      [   53.451025]  ? __pm_runtime_resume+0x58/0xb0
      [   53.451157]  i915_pci_probe+0xa6/0x2b0 [i915]
      [   53.451285]  ? i915_pci_remove+0x40/0x40 [i915]
      [   53.451295]  ? lockdep_hardirqs_on_prepare+0x124/0x230
      [   53.451302]  ? _raw_spin_unlock_irqrestore+0x42/0x50
      [   53.451309]  ? lockdep_hardirqs_on+0xbf/0x130
      [   53.451315]  ? preempt_count_sub+0xf/0xb0
      [   53.451321]  ? _raw_spin_unlock_irqrestore+0x2f/0x50
      [   53.451335]  pci_device_probe+0xf9/0x190
      [   53.451350]  really_probe+0x17f/0x5b0
      [   53.451365]  driver_probe_device+0x13a/0x1c0
      [   53.451376]  device_driver_attach+0x82/0x90
      [   53.451386]  ? device_driver_attach+0x90/0x90
      [   53.451391]  __driver_attach+0xab/0x190
      [   53.451401]  ? device_driver_attach+0x90/0x90
      [   53.451407]  bus_for_each_dev+0xe4/0x140
      [   53.451414]  ? subsys_dev_iter_exit+0x10/0x10
      [   53.451423]  ? __list_add_valid+0x2b/0xa0
      [   53.451440]  bus_add_driver+0x227/0x2e0
      [   53.451454]  driver_register+0xd3/0x150
      [   53.451585]  i915_init+0x92/0xac [i915]
      [   53.451592]  ? 0xffffffffa0a20000
      [   53.451598]  do_one_initcall+0xb6/0x3b0
      [   53.451606]  ? trace_event_raw_event_initcall_finish+0x150/0x150
      [   53.451614]  ? __kasan_kmalloc.constprop.0+0xc2/0xd0
      [   53.451627]  ? kmem_cache_alloc_trace+0x4a4/0x8e0
      [   53.451634]  ? kasan_unpoison_shadow+0x33/0x40
      [   53.451649]  do_init_module+0xf8/0x350
      [   53.451662]  load_module+0x43de/0x47f0
      [   53.451716]  ? module_frob_arch_sections+0x20/0x20
      [   53.451731]  ? rw_verify_area+0x5f/0x130
      [   53.451780]  ? __do_sys_finit_module+0x10d/0x1a0
      [   53.451785]  __do_sys_finit_module+0x10d/0x1a0
      [   53.451792]  ? __ia32_sys_init_module+0x40/0x40
      [   53.451800]  ? seccomp_do_user_notification.isra.0+0x5c0/0x5c0
      [   53.451829]  ? rcu_read_lock_bh_held+0xb0/0xb0
      [   53.451835]  ? mark_held_locks+0x24/0x90
      [   53.451856]  do_syscall_64+0x33/0x80
      [   53.451863]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
      [   53.451868] RIP: 0033:0x7fde09b4470d
      [   53.451875] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 53 f7 0c 00 f7 d8 64 89 01 48
      [   53.451880] RSP: 002b:00007ffd6abc1718 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
      [   53.451890] RAX: ffffffffffffffda RBX: 000056444e528150 RCX: 00007fde09b4470d
      [   53.451895] RDX: 0000000000000000 RSI: 00007fde09a21ded RDI: 000000000000000f
      [   53.451899] RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000000
      [   53.451904] R10: 000000000000000f R11: 0000000000000246 R12: 00007fde09a21ded
      [   53.451909] R13: 0000000000000000 R14: 000056444e329200 R15: 000056444e528150
      
      [   53.451957] Allocated by task 345:
      [   53.451995]  kasan_save_stack+0x1b/0x40
      [   53.452001]  __kasan_kmalloc.constprop.0+0xc2/0xd0
      [   53.452006]  kmem_cache_alloc+0x1cd/0x8d0
      [   53.452146]  i915_vma_instance+0x126/0xb70 [i915]
      [   53.452304]  i915_gem_object_ggtt_pin_ww+0x222/0x3f0 [i915]
      [   53.452446]  intel_dsb_prepare+0x14f/0x230 [i915]
      [   53.452588]  intel_atomic_commit+0x183/0x690 [i915]
      [   53.452730]  intel_initial_commit+0x2bc/0x2f0 [i915]
      [   53.452871]  intel_modeset_init_nogem+0xa02/0x2af0 [i915]
      [   53.452995]  i915_driver_probe+0x8af/0x1210 [i915]
      [   53.453120]  i915_pci_probe+0xa6/0x2b0 [i915]
      [   53.453125]  pci_device_probe+0xf9/0x190
      [   53.453131]  really_probe+0x17f/0x5b0
      [   53.453136]  driver_probe_device+0x13a/0x1c0
      [   53.453142]  device_driver_attach+0x82/0x90
      [   53.453148]  __driver_attach+0xab/0x190
      [   53.453153]  bus_for_each_dev+0xe4/0x140
      [   53.453158]  bus_add_driver+0x227/0x2e0
      [   53.453164]  driver_register+0xd3/0x150
      [   53.453286]  i915_init+0x92/0xac [i915]
      [   53.453292]  do_one_initcall+0xb6/0x3b0
      [   53.453297]  do_init_module+0xf8/0x350
      [   53.453302]  load_module+0x43de/0x47f0
      [   53.453307]  __do_sys_finit_module+0x10d/0x1a0
      [   53.453312]  do_syscall_64+0x33/0x80
      [   53.453318]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
      
      [   53.453345] Freed by task 82:
      [   53.453379]  kasan_save_stack+0x1b/0x40
      [   53.453384]  kasan_set_track+0x1c/0x30
      [   53.453389]  kasan_set_free_info+0x1b/0x30
      [   53.453394]  __kasan_slab_free+0x112/0x160
      [   53.453399]  kmem_cache_free+0xb2/0x3f0
      [   53.453536]  i915_gem_flush_free_objects+0x31a/0x3b0 [i915]
      [   53.453542]  process_one_work+0x519/0x9f0
      [   53.453547]  worker_thread+0x75/0x5c0
      [   53.453552]  kthread+0x1da/0x230
      [   53.453557]  ret_from_fork+0x22/0x30
      
      [   53.453584] The buggy address belongs to the object at ffff88811b1e8040
                      which belongs to the cache i915_vma of size 968
      [   53.453692] The buggy address is located 48 bytes inside of
                      968-byte region [ffff88811b1e8040, ffff88811b1e8408)
      [   53.453792] The buggy address belongs to the page:
      [   53.453842] page:00000000b35f7048 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811b1ef940 pfn:0x11b1e8
      [   53.453847] head:00000000b35f7048 order:3 compound_mapcount:0 compound_pincount:0
      [   53.453853] flags: 0x8000000000010200(slab|head)
      [   53.453860] raw: 8000000000010200 ffff888115596248 ffff888115596248 ffff8881155b6340
      [   53.453866] raw: ffff88811b1ef940 0000000000170001 00000001ffffffff 0000000000000000
      [   53.453870] page dumped because: kasan: bad access detected
      
      [   53.453895] Memory state around the buggy address:
      [   53.453944]  ffff88811b1e7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
      [   53.454011]  ffff88811b1e7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
      [   53.454079] >ffff88811b1e8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
      [   53.454146]                                                              ^
      [   53.454211]  ffff88811b1e8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
      [   53.454279]  ffff88811b1e8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
      [   53.454347] ==================================================================
      [   53.454414] Disabling lock debugging due to kernel taint
      [   53.454434] general protection fault, probably for non-canonical address 0xdead0000000000d0: 0000 [#1] PREEMPT SMP KASAN PTI
      [   53.454446] CPU: 1 PID: 345 Comm: systemd-udevd Tainted: G    B   W         5.10.0-rc5+ #12
      [   53.454592] RIP: 0010:i915_init_ggtt+0x26f/0x9e0 [i915]
      [   53.454602] Code: 89 8d 48 ff ff ff 4c 8d 60 d0 49 39 c7 0f 84 37 02 00 00 4c 89 b5 40 ff ff ff 4d 8d bc 24 90 00 00 00 4c 89 ff e8 c1 97 f8 e0 <49> 83 bc 24 90 00 00 00 00 0f 84 0f 02 00 00 49 8d 7c 24 08 e8 a8
      [   53.454618] RSP: 0018:ffff88812247f430 EFLAGS: 00010286
      [   53.454625] RAX: 0000000000000000 RBX: ffff888136440000 RCX: ffffffffa03fb78f
      [   53.454633] RDX: 0000000000000000 RSI: 0000000000000008 RDI: dead000000000160
      [   53.454641] RBP: ffff88812247f500 R08: ffffffff8113589f R09: 0000000000000000
      [   53.454648] R10: ffffffff83063843 R11: fffffbfff060c708 R12: dead0000000000d0
      [   53.454656] R13: ffff888136449ba0 R14: 0000000000002000 R15: dead000000000160
      [   53.454664] FS:  00007fde095c4880(0000) GS:ffff88840c880000(0000) knlGS:0000000000000000
      [   53.454672] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [   53.454679] CR2: 00007fef132b4f28 CR3: 000000012245c002 CR4: 00000000003706e0
      [   53.454686] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [   53.454693] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [   53.454700] Call Trace:
      [   53.454833]  ? i915_ggtt_suspend+0x1f0/0x1f0 [i915]
      Reported-by: default avatarMatthew Auld <matthew.auld@intel.com>
      Fixes: afeda4f3 ("drm/i915/dsb: Pre allocate and late cleanup of cmd buffer")
      Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
      Cc: Matthew Auld <matthew.auld@intel.com>
      Cc: Lucas De Marchi <lucas.demarchi@intel.com>
      Tested-by: default avatarMatthew Auld <matthew.auld@intel.com>
      Reviewed-by: default avatarMatthew Auld <matthew.auld@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20201125193032.29282-1-chris@chris-wilson.co.uk
      b3bf99da
  4. 24 Nov, 2020 1 commit
  5. 23 Nov, 2020 1 commit
  6. 20 Nov, 2020 2 commits
  7. 19 Nov, 2020 2 commits
  8. 18 Nov, 2020 16 commits
  9. 17 Nov, 2020 2 commits
    • Bob Paauwe's avatar
      drm/i915: Tweaked Wa_14010685332 for PCHs used on gen11 platforms · b896898c
      Bob Paauwe authored
      The WA specifies that we need to toggle a SDE chicken bit on and then
      off as the final step in preparation for s0ix entry.
      
          Bspec: 33450
          Bspec: 8402
      
      However, something is happening after we toggle the bit that causes
      the WA to be invalidated. This makes dispcnlunit1_cp_xosc_clkreq
      active being already in s0ix state i.e SLP_S0 counter incremented.
      Tweaking the Wa_14010685332 by setting the bit on suspend and clearing
      it on resume turns down the dispcnlunit1_cp_xosc_clkreq.
      B.Spec has Documented this tweaked sequence of WA as an alternative.
      Let keep this tweaked WA for Gen11 platforms and keep untweaked WA for
      other platforms which never observed this issue.
      
      v2 (MattR):
       - Change the comment on the workaround to give PCH names rather than
         platform names.  Although the bspec is setup to list workarounds by
         platform, the hardware team has confirmed that the actual issue being
         worked around here is something that was introduced back in the
         Cannon Lake PCH and carried forward to subsequent PCH's.
       - Extend the untweaked version of the workaround to include  PCH_CNP as
         well.  Note that since PCH_CNP is used to represent CMP, this will
         apply on CML and some variants of RKL too.
       - Cap the untweaked version of the workaround so that it won't apply to
         "fake" PCH's (i.e., DG1).  The issue we're working around really is
         an issue in the PCH itself, not the South Display, so it shouldn't
         apply when there isn't a real PCH.
      
      v3:
       - use intel_de_rmw(). [Rodrigo]
      
      Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
      Signed-off-by: default avatarBob Paauwe <bob.j.paauwe@intel.com>
      Signed-off-by: default avatarAnshuman Gupta <anshuman.gupta@intel.com>
      Signed-off-by: default avatarMatt Roper <matthew.d.roper@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20201110121700.4338-1-anshuman.gupta@intel.comReviewed-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
      b896898c
    • Ville Syrjälä's avatar
      drm/i915: Handle max_bpc==16 · 2ca5a7b8
      Ville Syrjälä authored
      EDID can declare the maximum supported bpc up to 16,
      and apparently there are displays that do so. Currently
      we assume 12 bpc is tha max. Fix the assumption and
      toss in a MISSING_CASE() for any other value we don't
      expect to see.
      
      This fixes modesets with a display with EDID max bpc > 12.
      Previously any modeset would just silently fail on platforms
      that didn't otherwise limit this via the max_bpc property.
      In particular we don't add the max_bpc property to HDMI
      ports on gmch platforms, and thus we would see the raw
      max_bpc coming from the EDID.
      
      I suppose we could already adjust this to also allow 16bpc,
      but seeing as no current platform supports that there is
      little point.
      
      Cc: stable@vger.kernel.org
      Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2632Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20201110210447.27454-1-ville.syrjala@linux.intel.comReviewed-by: default avatarJosé Roberto de Souza <jose.souza@intel.com>
      2ca5a7b8