1. 13 Oct, 2017 5 commits
  2. 12 Oct, 2017 7 commits
    • Chris Wilson's avatar
      drm/i915/selftests: Exercise adding requests to a full GGTT · 9c1477e8
      Chris Wilson authored
      A bug recently encountered involved the issue where are we were
      submitting requests to different ppGTT, each would pin a segment of the
      GGTT for its logical context and ring. However, this is invisible to
      eviction as we do not tie the context/ring VMA to a request and so do
      not automatically wait upon it them (instead they are marked as pinned,
      preventing eviction entirely). Instead the eviction code must flush those
      contexts by switching to the kernel context. This selftest tries to
      fill the GGTT with contexts to exercise a path where the
      switch-to-kernel-context failed to make forward progress and we fail
      with ENOSPC.
      
      v2: Make the hole in the filled GGTT explicit.
      v3: Swap out the arbitrary timeout for a private notification from
      i915_gem_evict_something()
      Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20171012125726.14736-3-chris@chris-wilson.co.ukReviewed-by: default avatarTvrtko Ursulin <tvrtko.ursulin@intel.com>
      9c1477e8
    • Chris Wilson's avatar
      drm/i915/selftests: Wrap a timer into a i915_sw_fence · 214707fc
      Chris Wilson authored
      For some selftests, we want to issue requests but delay them going to
      hardware. Furthermore, we don't want those requests to block
      indefinitely (or else we may hang the driver and block testing) so we
      want to employ a timeout. So naturally we want a fence that is
      automatically signaled by a timer.
      
      v2: Add kselftests.
      v3: Limit the API available to selftests; there isn't an overwhelming
      reason to export it universally.
      Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20171012125726.14736-2-chris@chris-wilson.co.ukReviewed-by: default avatarTvrtko Ursulin <tvrtko.ursulin@intel.com>
      214707fc
    • Chris Wilson's avatar
      drm/i915: Fix eviction when the GGTT is idle but full · 55b4f1ce
      Chris Wilson authored
      In the full-ppgtt world, we can fill the GGTT full of context objects.
      These context objects are currently implicitly tracked by the requests
      that pin them i.e. they are only unpinned when the request is completed
      and retired, but we do not have the link from the vma to the request
      (anymore). In order to unpin those contexts, we have to issue another
      request and wait upon the switch to the kernel context.
      
      The bug during eviction was that we assumed that a full GGTT meant we
      would have requests on the GGTT timeline, and so we missed situations
      where those requests where merely in flight (and when even they have not
      yet been submitted to hw yet). The fix employed here is to change the
      already-is-idle test to no look at the execution timeline, but count the
      outstanding requests and then check that we have switched to the kernel
      context. Erring on the side of overkill here just means that we stall a
      little longer than may be strictly required, but we only expect to hit
      this path in extreme corner cases where returning an erroneous error is
      worse than the delay.
      
      v2: Logical inversion when swapping over branches.
      
      Fixes: 80b204bc ("drm/i915: Enable multiple timelines")
      Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
      Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
      Reviewed-by: default avatarTvrtko Ursulin <tvrtko.ursulin@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20171012125726.14736-1-chris@chris-wilson.co.uk
      55b4f1ce
    • Ville Syrjälä's avatar
      drm/i915: Start tracking PSR state in crtc state · 4d90f2d5
      Ville Syrjälä authored
      Add the minimal amount of PSR tracking into the crtc state. This allows
      precomputing the possibility of using PSR correctly, and it means we can
      safely call the psr enable/disable functions for any DP endcoder.
      
      As a nice bonus we get rid of some more crtc->config usage, which we
      want to kill off eventually.
      
      v2: Fix 'goto unlock' fail in intel_psr_enable() (Jani)
          Check intel_dp_is_edp() in is_edp_psr() (Jani)
      
      Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
      Cc: Jani Nikula <jani.nikula@intel.com>
      Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20171012130201.21318-1-ville.syrjala@linux.intel.comReviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
      Acked-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
      4d90f2d5
    • Jani Nikula's avatar
      drm/i915: Update DRIVER_DATE to 20171012 · fa9caf0b
      Jani Nikula authored
      Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
      fa9caf0b
    • Joonas Lahtinen's avatar
      drm/i915: Simplify intel_sanitize_enable_ppgtt · 612dde7e
      Joonas Lahtinen authored
      Remove dead code around has_aliasing_ppgtt condition.
      Suggested-by: default avatarColin Ian King <colin.king@canonical.com>
      Signed-off-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
      Cc: Colin Ian King <colin.king@canonical.com>
      Cc: Chris Wilson <chris@chris-wilson.co.uk>
      Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Link: https://patchwork.freedesktop.org/patch/msgid/20171010143355.16577-1-joonas.lahtinen@linux.intel.com
      612dde7e
    • Chris Wilson's avatar
      drm/i915/userptr: Drop struct_mutex before cleanup · 7c781423
      Chris Wilson authored
      Purely to silence lockdep, as we know that no bo can exist at this time
      and so the inversion is impossible. Nevertheless, lockdep currently
      warns on unload:
      
      [  137.522565] WARNING: possible circular locking dependency detected
      [  137.522568] 4.14.0-rc4-CI-CI_DRM_3209+ #1 Tainted: G     U
      [  137.522570] ------------------------------------------------------
      [  137.522572] drv_module_relo/1532 is trying to acquire lock:
      [  137.522574]  ("i915-userptr-acquire"){+.+.}, at: [<ffffffff8109a831>] flush_workqueue+0x91/0x540
      [  137.522581]
                     but task is already holding lock:
      [  137.522583]  (&dev->struct_mutex){+.+.}, at: [<ffffffffa014fb3f>] i915_gem_fini+0x3f/0xc0 [i915]
      [  137.522605]
                     which lock already depends on the new lock.
      
      [  137.522608]
                     the existing dependency chain (in reverse order) is:
      [  137.522611]
                     -> #3 (&dev->struct_mutex){+.+.}:
      [  137.522615]        __lock_acquire+0x1420/0x15e0
      [  137.522618]        lock_acquire+0xb0/0x200
      [  137.522621]        __mutex_lock+0x86/0x9b0
      [  137.522623]        mutex_lock_interruptible_nested+0x1b/0x20
      [  137.522640]        i915_mutex_lock_interruptible+0x51/0x130 [i915]
      [  137.522657]        i915_gem_fault+0x20b/0x720 [i915]
      [  137.522660]        __do_fault+0x1e/0x80
      [  137.522662]        __handle_mm_fault+0xa08/0xed0
      [  137.522664]        handle_mm_fault+0x156/0x300
      [  137.522666]        __do_page_fault+0x2c5/0x570
      [  137.522668]        do_page_fault+0x28/0x250
      [  137.522671]        page_fault+0x22/0x30
      [  137.522672]
                     -> #2 (&mm->mmap_sem){++++}:
      [  137.522677]        __lock_acquire+0x1420/0x15e0
      [  137.522679]        lock_acquire+0xb0/0x200
      [  137.522682]        down_read+0x3e/0x70
      [  137.522699]        __i915_gem_userptr_get_pages_worker+0x141/0x240 [i915]
      [  137.522701]        process_one_work+0x233/0x660
      [  137.522704]        worker_thread+0x4e/0x3b0
      [  137.522706]        kthread+0x152/0x190
      [  137.522708]        ret_from_fork+0x27/0x40
      [  137.522710]
                     -> #1 ((&work->work)){+.+.}:
      [  137.522714]        __lock_acquire+0x1420/0x15e0
      [  137.522717]        lock_acquire+0xb0/0x200
      [  137.522719]        process_one_work+0x206/0x660
      [  137.522721]        worker_thread+0x4e/0x3b0
      [  137.522723]        kthread+0x152/0x190
      [  137.522725]        ret_from_fork+0x27/0x40
      [  137.522727]
                     -> #0 ("i915-userptr-acquire"){+.+.}:
      [  137.522731]        check_prev_add+0x430/0x840
      [  137.522733]        __lock_acquire+0x1420/0x15e0
      [  137.522735]        lock_acquire+0xb0/0x200
      [  137.522738]        flush_workqueue+0xb4/0x540
      [  137.522740]        drain_workqueue+0xd4/0x1b0
      [  137.522742]        destroy_workqueue+0x1c/0x200
      [  137.522758]        i915_gem_cleanup_userptr+0x15/0x20 [i915]
      [  137.522770]        i915_gem_fini+0x5f/0xc0 [i915]
      [  137.522782]        i915_driver_unload+0x122/0x180 [i915]
      [  137.522794]        i915_pci_remove+0x19/0x30 [i915]
      [  137.522797]        pci_device_remove+0x39/0xb0
      [  137.522800]        device_release_driver_internal+0x15d/0x220
      [  137.522803]        driver_detach+0x40/0x80
      [  137.522805]        bus_remove_driver+0x58/0xd0
      [  137.522807]        driver_unregister+0x2c/0x40
      [  137.522809]        pci_unregister_driver+0x36/0xb0
      [  137.522828]        i915_exit+0x1a/0x8b [i915]
      [  137.522831]        SyS_delete_module+0x18c/0x1e0
      [  137.522834]        entry_SYSCALL_64_fastpath+0x1c/0xb1
      [  137.522835]
                     other info that might help us debug this:
      
      [  137.522838] Chain exists of:
                       "i915-userptr-acquire" --> &mm->mmap_sem --> &dev->struct_mutex
      
      [  137.522844]  Possible unsafe locking scenario:
      
      [  137.522846]        CPU0                    CPU1
      [  137.522848]        ----                    ----
      [  137.522850]   lock(&dev->struct_mutex);
      [  137.522852]                                lock(&mm->mmap_sem);
      [  137.522854]                                lock(&dev->struct_mutex);
      [  137.522857]   lock("i915-userptr-acquire");
      [  137.522859]
                      *** DEADLOCK ***
      
      [  137.522862] 3 locks held by drv_module_relo/1532:
      [  137.522864]  #0:  (&dev->mutex){....}, at: [<ffffffff8161d47b>] device_release_driver_internal+0x2b/0x220
      [  137.522869]  #1:  (&dev->mutex){....}, at: [<ffffffff8161d489>] device_release_driver_internal+0x39/0x220
      [  137.522873]  #2:  (&dev->struct_mutex){+.+.}, at: [<ffffffffa014fb3f>] i915_gem_fini+0x3f/0xc0 [i915]
      [  137.522888]
                     stack backtrace:
      [  137.522891] CPU: 0 PID: 1532 Comm: drv_module_relo Tainted: G     U          4.14.0-rc4-CI-CI_DRM_3209+ #1
      [  137.522894] Hardware name:                  /NUC7i5BNB, BIOS BNKBL357.86A.0048.2017.0704.1415 07/04/2017
      [  137.522897] Call Trace:
      [  137.522900]  dump_stack+0x68/0x9f
      [  137.522902]  print_circular_bug+0x235/0x3c0
      [  137.522905]  ? lockdep_init_map_crosslock+0x20/0x20
      [  137.522908]  check_prev_add+0x430/0x840
      [  137.522919]  ? i915_gem_fini+0x5f/0xc0 [i915]
      [  137.522922]  ? __kernel_text_address+0x12/0x40
      [  137.522925]  ? __save_stack_trace+0x66/0xd0
      [  137.522928]  __lock_acquire+0x1420/0x15e0
      [  137.522930]  ? __lock_acquire+0x1420/0x15e0
      [  137.522933]  ? lockdep_init_map_crosslock+0x20/0x20
      [  137.522936]  ? __this_cpu_preempt_check+0x13/0x20
      [  137.522938]  lock_acquire+0xb0/0x200
      [  137.522940]  ? flush_workqueue+0x91/0x540
      [  137.522943]  flush_workqueue+0xb4/0x540
      [  137.522945]  ? flush_workqueue+0x91/0x540
      [  137.522948]  ? __mutex_unlock_slowpath+0x43/0x2c0
      [  137.522951]  ? trace_hardirqs_on_caller+0xe3/0x1b0
      [  137.522954]  drain_workqueue+0xd4/0x1b0
      [  137.522956]  ? drain_workqueue+0xd4/0x1b0
      [  137.522958]  destroy_workqueue+0x1c/0x200
      [  137.522975]  i915_gem_cleanup_userptr+0x15/0x20 [i915]
      [  137.522987]  i915_gem_fini+0x5f/0xc0 [i915]
      [  137.523000]  i915_driver_unload+0x122/0x180 [i915]
      [  137.523015]  i915_pci_remove+0x19/0x30 [i915]
      [  137.523018]  pci_device_remove+0x39/0xb0
      [  137.523021]  device_release_driver_internal+0x15d/0x220
      [  137.523023]  driver_detach+0x40/0x80
      [  137.523026]  bus_remove_driver+0x58/0xd0
      [  137.523028]  driver_unregister+0x2c/0x40
      [  137.523030]  pci_unregister_driver+0x36/0xb0
      [  137.523049]  i915_exit+0x1a/0x8b [i915]
      [  137.523052]  SyS_delete_module+0x18c/0x1e0
      [  137.523055]  entry_SYSCALL_64_fastpath+0x1c/0xb1
      [  137.523057] RIP: 0033:0x7f7bd0609287
      [  137.523059] RSP: 002b:00007ffef694bc18 EFLAGS: 00000246 ORIG_RAX: 00000000000000b0
      [  137.523062] RAX: ffffffffffffffda RBX: ffffffff81493f33 RCX: 00007f7bd0609287
      [  137.523065] RDX: 0000000000000001 RSI: 0000000000000800 RDI: 0000564f999f9fc8
      [  137.523067] RBP: ffffc90005c4ff88 R08: 0000000000000000 R09: 0000000000000080
      [  137.523069] R10: 00007f7bd20ef8c0 R11: 0000000000000246 R12: 0000000000000000
      [  137.523072] R13: 00007ffef694be00 R14: 0000000000000000 R15: 0000000000000000
      [  137.523075]  ? __this_cpu_preempt_check+0x13/0x20
      Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
      Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
      Link: https://patchwork.freedesktop.org/patch/msgid/20171011141857.14161-1-chris@chris-wilson.co.ukReviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
      7c781423
  3. 11 Oct, 2017 17 commits
  4. 10 Oct, 2017 11 commits