- 17 May, 2017 11 commits
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Chris Wilson authored
If we do not require to perform priority bumping, and we haven't yet submitted the request, we can update its priority in situ and skip acquiring the engine locks -- thus avoiding any contention between us and submit/execute. v2: Remove the stack element from the list if we can do the early assignment. Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170517121007.27224-10-chris@chris-wilson.co.uk
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Chris Wilson authored
The i915_priolist are allocated within an atomic context on a path where we wish to minimise latency. If we use a dedicated kmem_cache, we have the advantage of a local freelist from which to service new requests that should keep the latency impact of an allocation small. Though currently we expect the majority of requests to be at default priority (and so hit the preallocate priolist), once userspace starts using priorities they are likely to use many fine grained policies improving the utilisation of a private slab. Signed-off-by:
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Chris Wilson authored
All the requests at the same priority are executed in FIFO order. They do not need to be stored in the rbtree themselves, as they are a simple list within a level. If we move the requests at one priority into a list, we can then reduce the rbtree to the set of priorities. This should keep the height of the rbtree small, as the number of active priorities can not exceed the number of active requests and should be typically only a few. Currently, we have ~2k possible different priority levels, that may increase to allow even more fine grained selection. Allocating those in advance seems a waste (and may be impossible), so we opt for allocating upon first use, and freeing after its requests are depleted. To avoid the possibility of an allocation failure causing us to lose a request, we preallocate the default priority (0) and bump any request to that priority if we fail to allocate it the appropriate plist. Having a request (that is ready to run, so not leading to corruption) execute out-of-order is better than leaking the request (and its dependency tree) entirely. There should be a benefit to reducing execlists_dequeue() to principally using a simple list (and reducing the frequency of both rbtree iteration and balancing on erase) but for typical workloads, request coalescing should be small enough that we don't notice any change. The main gain is from improving PI calls to schedule, and the explicit list within a level should make request unwinding simpler (we just need to insert at the head of the list rather than the tail and not have to make the rbtree search more complicated). v2: Avoid use-after-free when deleting a depleted priolist v3: Michał found the solution to handling the allocation failure gracefully. If we disable all priority scheduling following the allocation failure, those requests will be executed in fifo and we will ensure that this request and its dependencies are in strict fifo (even when it doesn't realise it is only a single list). Normal scheduling is restored once we know the device is idle, until the next failure! Suggested-by:
Michał Wajdeczko <michal.wajdeczko@intel.com> Signed-off-by:
Michał Winiarski <michal.winiarski@intel.com> Reviewed-by:
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Chris Wilson authored
Explicitly assign the default priority, and give it a name. After much discussion, we have chosen to call it I915_PRIORITY_NORMAL! Signed-off-by:
Mika Kuoppala <mika.kuoppala@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170517121007.27224-7-chris@chris-wilson.co.uk
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Chris Wilson authored
If we *know* that the engine is idle, i.e. we have not more contexts in flight, we can skip any spurious CSB idle interrupts. These spurious interrupts seem to arrive long after we assert that the engines are completely idle, triggering later assertions: [ 178.896646] intel_engine_is_idle(bcs): interrupt not handled, irq_posted=2 [ 178.896655] ------------[ cut here ]------------ [ 178.896658] kernel BUG at drivers/gpu/drm/i915/intel_engine_cs.c:226! [ 178.896661] invalid opcode: 0000 [#1] SMP [ 178.896663] Modules linked in: i915(E) x86_pkg_temp_thermal(E) crct10dif_pclmul(E) crc32_pclmul(E) crc32c_intel(E) ghash_clmulni_intel(E) nls_ascii(E) nls_cp437(E) vfat(E) fat(E) intel_gtt(E) i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_sys_fops(E) aesni_intel(E) prime_numbers(E) evdev(E) aes_x86_64(E) drm(E) crypto_simd(E) cryptd(E) glue_helper(E) mei_me(E) mei(E) lpc_ich(E) efivars(E) mfd_core(E) battery(E) video(E) acpi_pad(E) button(E) tpm_tis(E) tpm_tis_core(E) tpm(E) autofs4(E) i2c_i801(E) fan(E) thermal(E) i2c_designware_platform(E) i2c_designware_core(E) [ 178.896694] CPU: 1 PID: 522 Comm: gem_exec_whispe Tainted: G E 4.11.0-rc5+ #14 [ 178.896702] task: ffff88040aba8d40 task.stack: ffffc900003f0000 [ 178.896722] RIP: 0010:intel_engine_init_global_seqno+0x1db/0x1f0 [i915] [ 178.896725] RSP: 0018:ffffc900003f3ab0 EFLAGS: 00010246 [ 178.896728] RAX: 0000000000000000 RBX: ffff88040af54000 RCX: 0000000000000000 [ 178.896731] RDX: ffff88041ec933e0 RSI: ffff88041ec8cc48 RDI: ffff88041ec8cc48 [ 178.896734] RBP: ffffc900003f3ac8 R08: 0000000000000000 R09: 000000000000047d [ 178.896736] R10: 0000000000000040 R11: ffff88040b344f80 R12: 0000000000000000 [ 178.896739] R13: ffff88040bce0000 R14: ffff88040bce52d8 R15: ffff88040bce0000 [ 178.896742] FS: 00007f2cccc2d8c0(0000) GS:ffff88041ec80000(0000) knlGS:0000000000000000 [ 178.896746] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 178.896749] CR2: 00007f41ddd8f000 CR3: 000000040bb03000 CR4: 00000000001406e0 [ 178.896752] Call Trace: [ 178.896768] reset_all_global_seqno.part.33+0x4e/0xd0 [i915] [ 178.896782] i915_gem_request_alloc+0x304/0x330 [i915] [ 178.896795] i915_gem_do_execbuffer+0x8a1/0x17d0 [i915] [ 178.896799] ? remove_wait_queue+0x48/0x50 [ 178.896812] ? i915_wait_request+0x300/0x590 [i915] [ 178.896816] ? wake_up_q+0x70/0x70 [ 178.896819] ? refcount_dec_and_test+0x11/0x20 [ 178.896823] ? reservation_object_add_excl_fence+0xa5/0x100 [ 178.896835] i915_gem_execbuffer2+0xab/0x1f0 [i915] [ 178.896844] drm_ioctl+0x1e6/0x460 [drm] [ 178.896858] ? i915_gem_execbuffer+0x260/0x260 [i915] [ 178.896862] ? dput+0xcf/0x250 [ 178.896866] ? full_proxy_release+0x66/0x80 [ 178.896869] ? mntput+0x1f/0x30 [ 178.896872] do_vfs_ioctl+0x8f/0x5b0 [ 178.896875] ? ____fput+0x9/0x10 [ 178.896878] ? task_work_run+0x80/0xa0 [ 178.896881] SyS_ioctl+0x3c/0x70 [ 178.896885] entry_SYSCALL_64_fastpath+0x17/0x98 [ 178.896888] RIP: 0033:0x7f2ccb455ca7 [ 178.896890] RSP: 002b:00007ffcabec72d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 178.896894] RAX: ffffffffffffffda RBX: 000055f897a44b90 RCX: 00007f2ccb455ca7 [ 178.896897] RDX: 00007ffcabec74a0 RSI: 0000000040406469 RDI: 0000000000000003 [ 178.896900] RBP: 00007f2ccb70a440 R08: 00007f2ccb70d0a4 R09: 0000000000000000 [ 178.896903] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 178.896905] R13: 000055f89782d71a R14: 00007ffcabecf838 R15: 0000000000000003 [ 178.896908] Code: 00 31 d2 4c 89 ef 8d 70 48 41 ff 95 f8 06 00 00 e9 68 fe ff ff be 0f 00 00 00 48 c7 c7 48 dc 37 a0 e8 fa 33 d6 e0 e9 0b ff ff ff <0f> 0b 0f 0b 0f 0b 0f 0b 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 On the other hand, by ignoring the interrupt do we risk running out of space in CSB ring? Testing for a few hours suggests not, i.e. that we only seem to get the odd delayed CSB idle notification. Signed-off-by:
Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170517121007.27224-6-chris@chris-wilson.co.uk
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Chris Wilson authored
add/remove: 1/1 grow/shrink: 5/4 up/down: 391/-578 (-187) function old new delta execlists_submit_ports 262 471 +209 port_assign.isra - 136 +136 capture 6344 6359 +15 reset_common_ring 438 452 +14 execlists_submit_request 228 238 +10 gen8_init_common_ring 334 341 +7 intel_engine_is_idle 106 105 -1 i915_engine_info 2314 2290 -24 __i915_gem_set_wedged_BKL 485 411 -74 intel_lrc_irq_handler 1789 1604 -185 execlists_update_context 294 - -294 The most important change there is the improve to the intel_lrc_irq_handler and excclist_submit_ports (net improvement since execlists_update_context is now inlined). v2: Use the port_api() for guc as well (even though currently we do not pack any counters in there, yet) and hide all port->request_count inside the helpers. Signed-off-by:
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Chris Wilson authored
Rebrand the current (pointer | bits) pack/unpack utility macros as explicit bit twiddling for PAGE_SIZE so that we can use the more flexible underlying macros for different bits. Signed-off-by:
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Chris Wilson authored
ptr_unpack_bits() is a function-like macro, as such it is meant to be replaceable by a function. In this case, we should be passing in the out-param as a pointer. Bizarrely this does affect code generation: function old new delta i915_gem_object_pin_map 409 389 -20 An improvement(?) in this case, but one can't help wonder what strict-aliasing optimisations we are preventing. The generated code looks identical in using ptr_unpack_bits (no extra motions to stack, the pointer and bits appear to be kept in registers), the difference appears to be code ordering and with a reorder it is able to use smaller forward jumps. Signed-off-by:
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Chris Wilson authored
A long time ago, I wrote some selftests for the struct kfence idea. Now that we have infrastructure in i915/igt for running kselftests, include some for i915_sw_fence. v2: INIT_WORK_ONSTACK/destroy_work_on_stack (Mika) Signed-off-by:
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Chris Wilson authored
My original intention was for i915_sw_fence to be the base class and provide the reference count for the container. This was from starting with a design to handle async_work. In practice, for i915 we embed fences into structs which have their own independent reference counting, making the i915_sw_fence.kref duplicitous. If we remove the kref, we remove the i915_sw_fence's ability to free itself and its independence, it can only exist within a container and must be supplied with a callback to handle its release. Signed-off-by:
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Arkadiusz Hiler authored
This basically reverts commit 465418c6 ("drm/i915/gen9: Remove WaEnableYV12BugFixInHalfSliceChicken7") with small addition - marking it as affecting GLK as well. It was incorrectly considered fixed in production steppings. References: HSD#2126385, HSD#2131381, HSDES#1504433555, BSID#0764 Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: Jeff McGee <jeff.mcgee@intel.com> Signed-off-by:
Arkadiusz Hiler <arkadiusz.hiler@intel.com> Reviewed-by:
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- 16 May, 2017 4 commits
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Matthew Auld authored
For the aliasing ppgtt we clear the va range up to vma->size, but seem to allocate up to vma->node.size, which is a little inconsistent given that vma->node.size >= vma->size. Not that is really matters all that much since we preallocate anyway, but for consistency just use vma->size. Fixes: ff685975 ("drm/i915: Move allocate_va_range to GTT") Signed-off-by:
Matthew Auld <matthew.auld@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170516085514.5853-1-matthew.auld@intel.comReviewed-by:
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Gustavo A. R. Silva authored
Simplify logic to avoid unnecessary variable declaration and assignment. Signed-off-by:
Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20170515220028.GA15149@embeddedgus
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Gustavo A. R. Silva authored
Local variable has_reduced_clock is assigned to a constant value and it is never updated again. Remove this variable and the dead code it guards. Addresses-Coverity-ID: 1362230 Signed-off-by:
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Colin Ian King authored
Trivial fix to spelling mistake in seq_printf message. Fixes: a8b9370f ("drm/i915/guc: Dump the GuC stage descriptor pool in debugfs") Signed-off-by:
Colin Ian King <colin.king@canonical.com> Signed-off-by:
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- 15 May, 2017 3 commits
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Madhav Chauhan authored
As per BSPEC, high/low switch count to be programmed in terms of byteclock using exit_zero_count and prep_count. For Geminilake exit/prep counts are already calculated in terms of byteclock. This patch calculates high/low switch count using counts value in byteclock, old calculation leads to screen flicker/shift issue while resuming from S3/S4. Signed-off-by:
Madhav Chauhan <madhav.chauhan@intel.com> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1494336565-19185-1-git-send-email-madhav.chauhan@intel.com
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Chris Wilson authored
Some 64b divides snuck in when doing the prng timing compensation. Fixes: 47979480 ("drm/i915: Squash repeated awaits on the same fence") Signed-off-by:
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Daniel Vetter authored
Signed-off-by:
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- 13 May, 2017 8 commits
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Robert Bragg authored
This change is pre-emptively aiming to avoid a potential cause of kernel logging noise in case some condition were to result in us seeing invalid OA reports. The workaround for the OA unit's tail pointer race condition is what avoids the primary known cause of invalid reports being seen and with that in place we aren't expecting to see this notice but it can't be entirely ruled out. Just in case some condition does lead to the notice then it's likely that it will be triggered repeatedly while attempting to append a sequence of reports and depending on the configured OA sampling frequency that might be a large number of repeat notices. v2: (Chris) avoid inconsistent warning on throttle with printk_ratelimit() v3: (Matt) init and summarise with stream init/close not driver init/fini Signed-off-by:Robert Bragg <robert@sixbynine.org> Reviewed-by:
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Robert Bragg authored
This updates the tail pointer race workaround handling to updating the 'aged' pointer before looking to start aging a new one. There's the possibility that there is already new data available and so we can immediately start aging a new pointer without having to first wait for a later hrtimer callback (and then another to age). Signed-off-by:
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Robert Bragg authored
A minor improvement to debugging output Signed-off-by:
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Robert Bragg authored
There's a HW race condition between OA unit tail pointer register updates and writes to memory whereby the tail pointer can sometimes get ahead of what's been written out to the OA buffer so far (in terms of what's visible to the CPU). Although this can be observed explicitly while copying reports to userspace by checking for a zeroed report-id field in tail reports, we want to account for this earlier, as part of the _oa_buffer_check to avoid lots of redundant read() attempts. Previously the driver used to define an effective tail pointer that lagged the real pointer by a 'tail margin' measured in bytes derived from OA_TAIL_MARGIN_NSEC and the configured sampling frequency. Unfortunately this was flawed considering that the OA unit may also automatically generate non-periodic reports (such as on context switch) or the OA unit may be enabled without any periodic sampling. This improves how we define a tail pointer for reading that lags the real tail pointer by at least %OA_TAIL_MARGIN_NSEC nanoseconds, which gives enough time for the corresponding reports to become visible to the CPU. The driver now maintains two tail pointers: 1) An 'aging' tail with an associated timestamp that is tracked until we can trust the corresponding data is visible to the CPU; at which point it is considered 'aged'. 2) An 'aged' tail that can be used for read()ing. The two separate pointers let us decouple read()s from tail pointer aging. The tail pointers are checked and updated at a limited rate within a hrtimer callback (the same callback that is used for delivering POLLIN events) and since we're now measuring the wall clock time elapsed since a given tail pointer was read the mechanism no longer cares about the OA unit's periodic sampling frequency. The natural place to handle the tail pointer updates was in gen7_oa_buffer_is_empty() which is called as part of blocking reads and the hrtimer callback used for polling, and so this was renamed to oa_buffer_check() considering the added side effect while checking whether the buffer contains data. Signed-off-by: -
Robert Bragg authored
This avoids redundantly passing an (inout) head and tail pointer to gen7_append_oa_reports() from gen7_oa_read which doesn't need to reference either itself. Moving the head/tail reads and writes into gen7_append_oa_reports should have no functional effect except to avoid some redundant head pointer writes in cases where nothing was copied to userspace. This is a stepping stone towards updating how the head and tail pointer state is managed to improve the workaround for the OA unit's tail pointer race. It reduces the number of places we need to read/write the head and tail pointers. Signed-off-by:
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Robert Bragg authored
There's no need for the driver to keep reading back the head pointer from hardware since the hardware doesn't update it automatically. This way we can treat any invalid head pointer value as a software/driver bug instead of spurious hardware behaviour. This change is also a small stepping stone towards re-working how the head and tail state is managed as part of an improved workaround for the tail register race condition. Signed-off-by:
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Robert Bragg authored
If the function for checking whether there is OA buffer data available (during a poll or blocking read) has false positives then we want to avoid a situation where the subsequent read() returns EAGAIN (after a more accurate check) followed by a poll() immediately reporting the same false positive POLLIN event and effectively maintaining a busy loop until there really is data. This makes sure that we clear the .pollin event status whenever we return EAGAIN to userspace which will throttle subsequent POLLIN events and repeated attempts to read to the 5ms intervals of the hrtimer callback we have. Signed-off-by:
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Robert Bragg authored
If I'm going to complain about a back-to-front convention then the least I can do is not muddle the comment up too. Signed-off-by:
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- 12 May, 2017 6 commits
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Puthikorn Voravootivat authored
Some panel will default to zero brightness when turning the panel off and on again. This patch restores last brightness level back when panel is turning back on. Signed-off-by:
Puthikorn Voravootivat <puthik@chromium.org> Reviewed-by:
Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Signed-off-by:
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Puthikorn Voravootivat authored
We should set backlight mode register before set register to enable the backlight. Signed-off-by:
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Puthikorn Voravootivat authored
intel_dp_aux_enable_backlight() assumed that the register BACKLIGHT_BRIGHTNESS_CONTROL_MODE can only has value 01 (DP_EDP_BACKLIGHT_CONTROL_MODE_PRESET) when initialize. This patch fixed that by handling all cases of that register. Signed-off-by:
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Puthikorn Voravootivat authored
intel_dp_aux_backlight driver should check for the DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP before enable the driver. Signed-off-by:
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Matthew Auld authored
If a vma is already bound to a ppgtt, we incorrectly call allocate_va_range again when doing a PIN_UPDATE, which will result in over accounting within our paging structures, such that when we do unbind something we don't actually destroy the structures and end up inadvertently recycling them. In reality this probably isn't too bad, but once we start touching PDEs and PDPEs for 64K/2M/1G pages this apparent recycling will manifest into lots of really, really subtle bugs. v2: Fix the testing of vma->flags for aliasing_ppgtt_bind_vma Fixes: ff685975 ("drm/i915: Move allocate_va_range to GTT") Signed-off-by:
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Chuanxiao Dong authored
During execlist_context_deferred_alloc() we presumed that the context is uninitialised (we only just allocated the state object for it!) and chose to optimise away the later call to engine->init_context() if engine->init_context were NULL. This breaks with GVT's contexts that are marked as pre-initialised to avoid us annoyingly calling engine->init_context(). The fix is to not override ce->initialised if it is already true. Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
Chuanxiao Dong <chuanxiao.dong@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1494497262-24855-1-git-send-email-chuanxiao.dong@intel.comReviewed-by:
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- 11 May, 2017 6 commits
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Joonas Lahtinen authored
Due to the complex dependencies between workqueues and RCU, which are not easily detected by lockdep, do not synchronize RCU during shrinking. On low-on-memory systems (mem=1G for example), the RCU sync leads to all system workqueus freezing and unrelated lockdep splats are displayed according to reports. GIT bisecting done by J. R. Okajima points to the commit where RCU syncing was extended. RCU sync gains us very little benefit in real life scenarios where the amount of memory used by object backing storage is dominant over the metadata under RCU, so drop it altogether. " Yeeeaah, if core could just, go ahead and reclaim RCU queues, that'd be great. " - Chris Wilson, 2016 (0eafec6d) v2: More information to commit message. v3: Remove "grep _rcu_" escapee from i915_gem_shrink_all (Andrea) Fixes: c053b5a5 ("drm/i915: Don't call synchronize_rcu_expedited under struct_mutex") Suggested-by:
J. R. Okajima <hooanon05g@gmail.com> Signed-off-by:
Hugh Dickins <hughd@google.com> Tested-by:
Andrea Arcangeli <aarcange@redhat.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: J. R. Okajima <hooanon05g@gmail.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: <stable@vger.kernel.org> # v4.11+ Link: http://patchwork.freedesktop.org/patch/msgid/1494414040-11160-1-git-send-email-joonas.lahtinen@linux.intel.com
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Michal Wajdeczko authored
We are using some scratch registers in MMIO based send function. Make their base and count flexible in preparation of upcoming GuC firmware/hardware changes. While around, change cmd len parameter verification from WARN_ON to GEM_BUG_ON as we don't need this all the time. v2: call out WARN/GEM_BUG change in the commit msg (Daniele) v3: don't overqualify the ints (Chris) v4: rebase and use proper enum Signed-off-by:
Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jani Nikula <jani.nikula@linux.intel.com> Reviewed-by:
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Michal Wajdeczko authored
Prepare for alternate GuC notification mechanism. Signed-off-by:
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Maarten Lankhorst authored
commit a667fb40 Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Date: Thu Dec 15 15:29:44 2016 +0100 drm/i915: Disable all crtcs during driver unload, v2. made sure that all crtc's are disabled on driver unload, but only the following commit made sure all fb's are cleaned up correctly: commit 9b2104f4 Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Date: Tue Feb 21 14:51:40 2017 +0100 drm/atomic: Make disable_all helper fully disable the crtc. Finally remove this and add a WARN_ON when vma is set. It should have been removed by intel_cleanup_plane_fb(). Signed-off-by:
Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170511082844.13965-2-maarten.lankhorst@linux.intel.comReviewed-by:
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Maarten Lankhorst authored
We shouldn't inspect crtc->state, instead grab the crtc state. At this point the hw state verifier should be able to run even if crtc->state has been updated (which cannot currently happen). Signed-off-by:
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Oscar Mateo authored
We are missing pieces of information that could be useful for GuC debugging. v2: Reuse some code (Joonas) Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reviewed-by:
Oscar Mateo <oscar.mateo@intel.com> [Joonas: Removed extra newline and s/uint32_t/u32/ for checkpatch.pl] Signed-off-by:
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- 10 May, 2017 2 commits
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Daniel Vetter authored
The unconditionally fallback to the blocking wait_for resulted in impressive fireworks at boot-up on my snb here. Make sure if we set the slow timeout to 0 that we never ever sleep. The tail of the callchain was intel_wait_for_register -> __intel_wait_for_register_fw -> usleep_range -> BOOM It blew up in intel_crt_detect load detection code on the ADPA_CRT_HOTPLUG_FORCE_TRIGGER in the ADPA register. v2: Shut up gcc. v3: Use uninitialized_var() (Chris). Fixes: 05646543 ("drm/i915: Acquire uncore.lock over intel_uncore_wait_for_register()") Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Reviewed-by:Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1494429572-15118-1-git-send-email-daniel.vetter@ffwll.ch
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Ville Syrjälä authored
It looks like simply writing all the cursor register every single time might be slightly faster than checking to see of each of them need to be written. So if any other register apart from CURPOS needs to be written let's just write all the registers. CURPOS is left as a special case mainly for 845/865 where we have to disable the cursor to change many of the cursor parameters. This introduces a slight chance of the cursor flickering when things get updated (since we're not currently doing the vblank evade for cursor updates). If we write CURPOS alone then that obviously can't happen. And let's follow the same pattern in the i9xx code just for symmetry. I wasn't able to see a singificant performance difference between this and just writing all the registers unconditionally. Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170327185546.2977-16-ville.syrjala@linux.intel.comReviewed-by:
Imre Deak <imre.deak@intel.com>
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