- 14 Apr, 2016 31 commits
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Ville Syrjälä authored
No need to actually handle the GT/PM interrupt while we have interrupt sources disabled. Move the actual processing to happen after we've restored VLV_IER and master interrupt enable. Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1460571598-24452-11-git-send-email-ville.syrjala@linux.intel.comReviewed-by:
Chris Wilson <chris@chris-wilson.co.uk>
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Ville Syrjälä authored
Minimize the amount of stuff we do with interrupt sources disabled by splitting the PIPESTAT irq handling into ack+handler phases. Signed-off-by:
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Ville Syrjälä authored
Split the VLV/CHV hoplug irq handling to ack and handler phases. This way we can move the actual irq handling outside the section where we have disabled the interrupt sources. For now, we leave things as is for pre-VLV GMCH platforms, but eventually they could get the same treatment. Signed-off-by:
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Ville Syrjälä authored
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Ville Syrjälä authored
Now that we've dealt with the races in clearing IIR bits via VLV_IER and the master interrupt enable, we can go ahead aliminate the loop from the VLV interrupt handler. Signed-off-by:
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Ville Syrjälä authored
On VLV/CHV the master interrupt enable bit only affects GT/PM interrupts. Display interrupts are not affected by the master irq control. Also it seems that the CPU interrupt will only be generated when the combined result of all GT/PM/display interrupts has a 0->1 edge. We already use the master interrupt enable bit to make sure GT/PM interrupt can generate such an edge if we don't end up clearing all IIR bits. We must do the same for display interrupts, and for that we can simply clear out VLV_IER, and restore after we've acked all the interrupts we are about to process. So with both master interrupt enable and VLV_IER cleared out, we will guarantee that there will be a 0->1 edge if any IIR bits are still set at the end, and thus another CPU interrupt will be generated. Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Fixes: 579de73b ("drm/i915: Exit cherryview_irq_handler() after one pass") Signed-off-by:
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Ville Syrjälä authored
Like on CHV, let's clear out the master irq enable bit when we ack GT/PM interrupts. This will allow GT/PM interrupts to re-raise the CPU interrupt if we fail to clear all the bits from the IIR(s). Signed-off-by:
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Ville Syrjälä authored
On VLV/CHV VLV_IIR is not double double buffered, and it doesn't detect edges from PIPESTAT & co. like it does on gen4. Instead it just directly latches the level from PIPESTAT & co. That means we must clear VLV_IIR after PIPESTAT & co. or else we'll get a spurious bit in VLV_IIR every single time. Signed-off-by:
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Ville Syrjälä authored
We're lacking VLV_MASTER_IER setup from valleyview_irq_preinstall(), so add it there. Also cargo cult in some POSTING_READ()s to match the other platforms. Signed-off-by:
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Ville Syrjälä authored
Use GEN8_MASTER_IRQ_CONTROL instead of DE_MASTER_IRQ_CONTROL or MASTER_INTERRUPT_ENABLE with the GEN8_MASTER_IRQ register. They're all bit 31 so there's no actual bug here, but let's be consistent which name we use for the bit. Signed-off-by:
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Ville Syrjälä authored
On CHV GTFIFODBG has some read-only bits to indicate the number of free FIFO entries. Ignore these when checking to see if any of the sticky error bits are set. This gets rid of these during device resume: [drm:cherryview_enable_rps] GT fifo had a previous error 1080000 While at it, move the assignments out of the if(). Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch>
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Peter Antoine authored
Allow for the MOCS to be programmed for all engines. Currently we program the MOCS when the first render batch goes through. This works on most platforms but fails on platforms that do not run a render batch early, i.e. headless servers. The patch now programs all initialised engines on init and the RCS is programmed again within the initial batch. This is done for predictable consistency with regards to the hardware context. Hardware context loading sets the values of the MOCS for RCS and L3CC. Programming them from within the batch makes sure that the render context is valid, no matter what the previous state of the saved-context was. v2: posted correct version to the mailing list. v3: moved programming to within engine->init_hw() (Chris Wilson) v4: code formatting and white-space changes. (Chris Wilson) Testcase: igt/gem_mocs_settings Signed-off-by:
Peter Antoine <peter.antoine@intel.com> Reviewed-by:
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Chris Wilson authored
Conceptually, each request is a record of a hardware transaction - we build up a list of pending commands and then either commit them to hardware, or cancel them. However, whilst building up the list of pending commands, we may modify state outside of the request and make references to the pending request. If we do so and then cancel that request, external objects then point to the deleted request leading to both graphical and memory corruption. The easiest example is to consider object/VMA tracking. When we mark an object as active in a request, we store a pointer to this, the most recent request, in the object. Then we want to free that object, we wait for the most recent request to be idle before proceeding (otherwise the hardware will write to pages now owned by the system, or we will attempt to read from those pages before the hardware is finished writing). If the request was cancelled instead, that wait completes immediately. As a result, all requests must be committed and not cancelled if the external state is unknown. All that remains of i915_gem_request_cancel() users are just a couple of extremely unlikely allocation failures, so remove the API entirely. A consequence of committing all incomplete requests is that we generate excess breadcrumbs and fill the ring much more often with dummy work. We have completely undone the outstanding_last_seqno optimisation. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93907Signed-off-by:
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Chris Wilson authored
After mi_set_context() succeeds, we need to update the state of the engine's last_context. This ensures that we hold a pin on the context whilst the hardware may write to it. However, since we didn't complete the post-switch setup of the context, we need to force the subsequent use of the same context to complete the setup (which means updating should_skip_switch()). Signed-off-by:
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Chris Wilson authored
Having the !RCS legacy context switch threaded through the RCS switching code makes it much harder to follow and understand. In the next patch, I want to fix a bug handling the incomplete switch, this is made much simpler if we segregate the two paths now. Signed-off-by:
Daniel Vetter <daniel@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1460565315-7748-14-git-send-email-chris@chris-wilson.co.uk
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Chris Wilson authored
As paranoia, we want to ensure that the CPU's PTEs have been revoked for the object before we return from i915_gem_release_mmap(). This allows us to rely on there being no outstanding memory accesses from userspace and guarantees serialisation of the code against concurrent access just by calling i915_gem_release_mmap(). v2: Reduce the mb() into a wmb() following the revoke. Signed-off-by:
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Chris Wilson authored
For reasons unknown Sandybridge GT1 (at least) will eventually hang when it encounters a ring wraparound at offset 0. The test case that reproduces the bug reliably forces a large number of interrupted context switches, thereby causing very frequent ring wraparounds, but there are similar bug reports in the wild with the same symptoms, seqno writes stop just before the wrap and the ringbuffer at address 0. It is also timing crucial, but adding various delays hasn't helped pinpoint where the window lies. Whether the fault is restricted to the ringbuffer itself or the GTT addressing is unclear, but moving the ringbuffer fixes all the hangs I have been able to reproduce. References: (e.g.) https://bugs.freedesktop.org/show_bug.cgi?id=93262 Testcase: igt/gem_exec_whisper/render-contexts-interruptible #snb-gt1 Signed-off-by:
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Chris Wilson authored
Two concurrent writes into the same register cacheline has the chance of killing the machine on Ivybridge and other gen7. This includes LRI emitted from the command parser. The MI_SET_CONTEXT itself serves as serialising barrier and prevents the pair of register writes in the first packet from triggering the fault. However, if a second switch-context immediately occurs then we may have two adjacent blocks of LRI to the same registers which may then trigger the hang. To counteract this we need to insert a delay after the second register write using SRM. This is easiest to reproduce with something like igt/gem_ctx_switch/interruptible that triggers back-to-back context switches (with no operations in between them in the command stream, which requires the execbuf operation to be interrupted after the MI_SET_CONTEXT) but can be observed sporadically elsewhere when running interruptible igt. No reports from the wild though, so it must be of low enough frequency that no one has correlated the random machine freezes with i915.ko The issue was introduced with commit 2c550183 [v3.19] Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Dec 16 10:02:27 2014 +0000 drm/i915: Disable PSMI sleep messages on all rings around context switches Testcase: igt/gem_ctx_switch/render-interruptible #ivb Signed-off-by:
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Chris Wilson authored
If we do not have lowlevel support for reseting the GPU, or if the user has explicitly disabled reseting the device, the failure is expected. Since it is an expected failure, we should be using a lower priority message than *ERROR*, perhaps NOTICE. In the absence of DRM_NOTICE, just emit the expected failure as a DEBUG message. Signed-off-by:
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Chris Wilson authored
Reporting -EIO from i915_wait_request() has proven very troublematic over the years, with numerous hard-to-reproduce bugs cropping up in the corner case of where a reset occurs and the code wasn't expecting such an error. If the we reset the GPU or have detected a hang and wish to reset the GPU, the request is forcibly complete and the wait broken. Currently, we report either -EAGAIN or -EIO in order for the caller to retreat and restart the wait (if appropriate) after dropping and then reacquiring the struct_mutex (essential to allow the GPU reset to proceed). However, if we take the view that the request is complete (no further work will be done on it by the GPU because it is dead and soon to be reset), then we can proceed with the task at hand and then drop the struct_mutex allowing the reset to occur. This transfers the burden of checking whether it is safe to proceed to the caller, which in all but one instance it is safe - completely eliminating the source of all spurious -EIO. Of note, we only have two API entry points where we expect that userspace can observe an EIO. First is when submitting an execbuf, if the GPU is terminally wedged, then the operation cannot succeed and an -EIO is reported. Secondly, existing userspace uses the throttle ioctl to detect an already wedged GPU before starting using HW acceleration (or to confirm that the GPU is wedged after an error condition). So if the GPU is wedged when the user calls throttle, also report -EIO. v2: Split more carefully the change to i915_wait_request() and assorted ABI from the reset handling. v3: Add a couple of WARN_ON(EIO) to the interruptible modesetting code so that we don't start to leak EIO there in future (and break our hang resistant modesetting). Signed-off-by:
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Chris Wilson authored
Now that the reset_counter is stored on the request, we can rearrange the code to handle reading the counter versus waiting during the atomic modesetting for readibility (by deleting the hairiest of codes). Signed-off-by:
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Chris Wilson authored
As the request is only valid during the same global reset epoch, we can record the current reset_counter when constructing the request and reuse it when waiting upon that request in future. This removes a very hairy atomic check serialised by the struct_mutex at the time of waiting and allows us to transfer those waits to a central dispatcher for all waiters and all requests. PS: With per-engine resets, we obviously cannot assume a global reset epoch for the requests - a per-engine epoch makes the most sense. The challenge then is how to handle checking in the waiter for when to break the wait, as the fine-grained reset may also want to requeue the request (i.e. the assumption that just because the epoch changes the request is completed may be broken - or we just avoid breaking that assumption with the fine-grained resets). Signed-off-by:
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Chris Wilson authored
In the reset_counter, we use two bits to track a GPU hang and reset. The low bit is a "reset-in-progress" flag that we set to signal when we need to break waiters in order for the recovery task to grab the mutex. As soon as the recovery task has the mutex, we can clear that flag (which we do by incrementing the reset_counter thereby incrementing the gobal reset epoch). By clearing that flag when the recovery task holds the struct_mutex, we can forgo a second flag that simply tells GEM to ignore the "reset-in-progress" flag. The second flag we store in the reset_counter is whether the reset failed and we consider the GPU terminally wedged. Whilst this flag is set, all access to the GPU (at least through GEM rather than direct mmio access) is verboten. PS: Fun is in store, as in the future we want to move from a global reset epoch to a per-engine reset engine with request recovery. Signed-off-by:
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Chris Wilson authored
If we, when we store the reset_counter for the operation, we ensure that it is not in a wedged or in the middle of a reset, we can then assert that if any reset occurs the reset_counter must change. Later we can just compare the operation's reset epoch against the current counter to see if we need to abort the operation (to handle the hang). Signed-off-by:
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Chris Wilson authored
This is principally a little bit of syntatic sugar to hide the atomic_read()s throughout the code to retrieve the current reset_counter. It also provides the other utility functions to check the reset state on the already read reset_counter, so that (in later patches) we can read it once and do multiple tests rather than risk the value changing between tests. v2: Be more strict on converting existing i915_reset_in_progress() over to the more verbose i915_reset_in_progress_or_wedged(). Signed-off-by:
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Chris Wilson authored
Currently there is a #define to enable extra BUG_ON for debugging requests and associated activities. I want to expand its use to cover all of GEM internals (so that we can saturate the code with asserts). We can add a Kconfig option to make it easier to enable - with the usual caveats of not enabling unless explicitly requested. Signed-off-by:
Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1460565315-7748-3-git-send-email-chris@chris-wilson.co.uk
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Chris Wilson authored
Separate out the layers of includes (linux, drm, intel, i915) so that it is a little easier to order our definitions between our multiple reentrant headers. A couple of headers needed fixes to make them more standalone (forgotten includes, forward declarations etc). Signed-off-by:
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Chris Wilson authored
Our driver compiles clean (nowadays thanks to 0day) but for me, at least, it would be beneficial if the compiler threw an error rather than a warning when it found a piece of suspect code. (I use this to compile-check patch series and want to break on the first compiler error in order to fix the patch.) v2: Kick off a new "Debugging" submenu for i915.ko At this point, we applied it to the kernel and promptly kicked it out again as it broke buildbots (due to a compiler warning on 32bits): commit 908d759b Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Tue May 26 07:46:21 2015 +0200 Revert "drm/i915: Force clean compilation with -Werror" v3: Avoid enabling -Werror for allyesconfig/allmodconfig builds, using COMPILE_TEST as a suitable proxy suggested by Andrew Morton. (Damien) Only make the option available for EXPERT to reinforce that the option should not be casually enabled. Signed-off-by:
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Mika Kuoppala authored
With gen9+ the edram capabilities are defined so that we can calculate the edram (ellc) size accordingly. Note that there are undefined combinations for some subset of edram capability bits. Return the closest size for undefined indexes. Even if we get it wrong with beginning of future gen enabling, the size information is currently only used for boot message and in debugfs entry. v2: Use function instead of hard to read macro (Daniel) v3: s/INTEL_INFO/INTEL_GEN (Matthew) Signed-off-by:
Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by:
Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1460557604-7126-2-git-send-email-mika.kuoppala@intel.com
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Mika Kuoppala authored
Store the edram capabilities instead of only the size of edram. This is preparatory patch to allow edram size calculation based on edram capability bits for gen9+. With gen9 the edram is behind llc and is a separate entity. With hsw/bdw it was more of a victim cache for LLC so the name 'eLLC' might be warranted. Regardless, rename all mentions of eLLC to EDRAM to clear the confusion. v2: return bytes for edram size (Chris) s/eLLC/eDRAM in output if we are gen > 8 v3: rebase, INTEL_GEN (Chris) Signed-off-by: -
Mika Kuoppala authored
For gen9 onwards, eDRAM is a true memory side cache. So there is no need to program idi hash mask as it is for eLLC only. v2: INTEL_GEN (Chris), s/has/hash (Matthew) Signed-off-by:
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- 13 Apr, 2016 7 commits
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Jani Nikula authored
The whole file is ignored on CONFIG_ACPI=n. Reviewed-by:
Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1460127589-8357-1-git-send-email-jani.nikula@intel.com
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Michał Winiarski authored
We started to use PIPE_CONTROL to write render ring seqno in order to combat seqno write vs interrupt generation problems. This was introduced by commit 7c17d377 ("drm/i915: Use ordered seqno write interrupt generation on gen8+ execlists"). On gen8+ size of PIPE_CONTROL with Post Sync Operation should be 6 dwords. When we're using older 5-dword variant it's possible to observe inconsistent values written by PIPE_CONTROL with Post Sync Operation from user batches, resulting in rendering corruptions. v2: Fix BAT failures v3: Comments on alignment and thrashing high dword of seqno (Chris) v4: Updated commit msg (Mika) Testcase: igt/gem_pipe_control_store_loop/*-qword-write Issue: VIZ-7393 Cc: stable@vger.kernel.org Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Signed-off-by:
Michał Winiarski <michal.winiarski@intel.com> Reviewed-by:
Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Signed-off-by:
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Mika Kuoppala authored
Experiments with heaven 4.0 benchmark and skylake gt3e (rev 0xa) suggest that WaForceContextSaveRestoreNonCoherent is needed for all revs. Extending this to all revs cures a gpu hang with rev 0xa when running heaven4.0 gpu benchmark. We have been here before, with problems enabling gt4e and extending up to revision F0 instead of false claims of bspec of E0 only. See commit <e238659d> ("drm/i915/skl: Default to noncoherent access up to F0"). In retrospect we should have covered this with this big blanket back then already, as E0 vs F0 discrepancy was suspicious enough. Previously the WaForceEnableNonCoherent has been tied to context non-coherence, atleast in relevant hsds. So keep this tie and extended this alongside. Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Cc: Ben Widawsky <benjamin.widawsky@intel.com> Cc: Timo Aaltonen <tjaalton@ubuntu.com> Cc: stable@vger.kernel.org Reported-by:
Mike Lothian <mike@fireburn.co.uk> References: https://bugs.freedesktop.org/show_bug.cgi?id=93491Signed-off-by:
Ben Widawsky <benjamin.widawsky@intel.com> Tested-by:
Timo Aaltonen <tjaalton@ubuntu.com> Link: http://patchwork.freedesktop.org/patch/msgid/1459860977-27751-2-git-send-email-mika.kuoppala@intel.com
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Mika Kuoppala authored
For all gt3 and gt4 skylake variants, extend the usage of WaRsDisableCoarsePowerGating for all revisions. Without this gt3 and gt4 skylakes up to atleast rev 0xa can gpu hang or system hang. Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Cc: Ben Widawsky <benjamin.widawsky@intel.com> Cc: Timo Aaltonen <tjaalton@ubuntu.com> Cc: <stable@vger.kernel.org> Reported-by:
Mikael Djurfeldt <mikael@djurfeldt.com> References: https://bugs.freedesktop.org/show_bug.cgi?id=94161Signed-off-by:
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Jani Nikula authored
Sudden realization: $ grep -ho "INTEL_INFO([^)]*)->[a-zA-Z0-9_]*" *.[ch] | sed 's/.*->//' |\ sort | uniq -c | sort -rn | head -5 446 gen 24 num_pipes 10 ring_mask 9 color 4 subslice_per_slice Acked-by: -
Tvrtko Ursulin authored
We can use the new pin/lazy unpin API for simplicity and more performance in the execlist submission paths. v2: * Fix error handling and convert more users. * Compact some names for readability. v3: * intel_lr_context_free was not unpinning. * Special case for GPU reset which otherwise unbalances the HWS object pages pin count by running the engine initialization only (not destructors). v4: * Rebased on top of hws setup/init split. Signed-off-by:Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1460472042-1998-1-git-send-email-tvrtko.ursulin@linux.intel.com [tursulin: renames: s/hwd/hws/, s/obj_addr/vaddr/] Reviewed-by:
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Tvrtko Ursulin authored
Split the hardware status page into setup and initialisation, where setup means setting up the driver state to support the engine, and initialization means programming the hardware with the before set up state. This way the design matches the design of the engine setup/init code which is split in the same fashion and it enables the stages to be used in a balanced fashion (engine setup - hws setup, engine init - hws init). This will enable the upcoming improvements to slot in without any kludges on the GPU reset path. Signed-off-by:
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- 12 Apr, 2016 2 commits
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Ville Syrjälä authored
Check whether the DPLL is even enabled before readoing out the dividers and trying to derive port_clock on CHV. We already did this on VLV. Also remove the comment "MIPI" comment from the VLV code since we call this function whenever the pipe is enabled. Signed-off-by:
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Ville Syrjälä authored
pgm_ratios in stored as a register value in pipe config, so let's dump this one as hex as well. Signed-off-by:
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