- 20 Dec, 2020 1 commit
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Chris Wilson authored
tasklet_kill() ensures that we _yield_ the processor until a remote tasklet is completed. However, this leads to a starvation condition as being at the bottom of the scheduler's runqueue means that anything else is able to run, including all hogs keeping the tasklet occupied. Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201220134858.10510-1-chris@chris-wilson.co.uk
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- 18 Dec, 2020 3 commits
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Chris Wilson authored
Since we allow removing the timeline map at runtime, there is a risk that rq->hwsp points into a stale page. To control that risk, we hold the RCU read lock while reading *rq->hwsp, but we missed a couple of important barriers. First, the unpinning / removal of the timeline map must be after all RCU readers into that map are complete, i.e. after an rcu barrier (in this case courtesy of call_rcu()). Secondly, we must make sure that the rq->hwsp we are about to dereference under the RCU lock is valid. In this case, we make the rq->hwsp pointer safe during i915_request_retire() and so we know that rq->hwsp may become invalid only after the request has been signaled. Therefore is the request is not yet signaled when we acquire rq->hwsp under the RCU, we know that rq->hwsp will remain valid for the duration of the RCU read lock. This is a very small window that may lead to either considering the request not completed (causing a delay until the request is checked again, any wait for the request is not affected) or dereferencing an invalid pointer. Fixes: 3adac468 ("drm/i915: Introduce concept of per-timeline (context) HWSP") Signed-off-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201218122421.18344-1-chris@chris-wilson.co.uk
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Aditya Swarup authored
Add bound checks for TGL REV ID array. Since, there might be a possibility of using older kernels on latest platform revisions, resulting in out of bounds access for rev ID array. In this scenario, use the latest rev ID available and apply those WAs. Also, modify GT macros for TGL rev ID to reuse tgl_revids_get(). Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Lucas De Marchi <lucas.demarchi@intel.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
Aditya Swarup <aditya.swarup@intel.com> Signed-off-by:
Lucas De Marchi <lucas.demarchi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201203072359.156682-2-aditya.swarup@intel.com
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Aditya Swarup authored
Fix TGL REVID macros to fetch correct display/gt stepping based on SOC rev id from INTEL_REVID() macro. Previously, we were just returning the first element of the revid array instead of using the correct index based on SOC rev id. Fixes: c33298cb ("drm/i915/tgl: Fix stepping WA matching") Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Lucas De Marchi <lucas.demarchi@intel.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
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- 17 Dec, 2020 2 commits
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Chris Wilson authored
Since we wake the GT up before executing a request, and go to sleep as soon as it is retired, the GT wake time not only represents how long the device is powered up, but also provides a summary, albeit an overestimate, of the device runtime (i.e. the rc0 time to compare against rc6 time). v2: s/busy/awake/ v3: software-gt-awake-time and I915_PMU_SOFTWARE_GT_AWAKE_TIME Signed-off-by:
kernel test robot <oliver.sang@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201215154456.13954-1-chris@chris-wilson.co.uk
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Chris Wilson authored
Matthew Brost pointed out that the while-loop on a shared breadcrumb was inherently fraught with danger as it competed with the other users of the breadcrumbs. However, in order to completely drain the re-arming irq worker, the while-loop is a necessity, despite my optimism that we could force cancellation with a couple of irq_work invocations. Given that we can't merely drop the while-loop, use an activity counter on the breadcrumbs to detect when we are parking the breadcrumbs for the last time. Based on a patch by Matthew Brost. Reported-by:
Matthew Brost <matthew.brost@intel.com> Suggested-by:
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- 16 Dec, 2020 4 commits
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Chris Wilson authored
Use the wait_queue_entry.flags to denote the special fence behaviour (flattening continuations along fence chains, and for propagating errors) rather than trying to detect ordinary waiters by their functions. Signed-off-by:
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Chris Wilson authored
Reduce the pollution of intel_engine.h by moving gen8_emit_pipe_control and friends to gen8_engine_cs.h Signed-off-by:
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Chris Wilson authored
The free_list and worker was introduced in commit 5f09a9c8 ("drm/i915: Allow contexts to be unreferenced locklessly"), but subsequently made redundant by the removal of the last sleeping lock in commit 2935ed53 ("drm/i915: Remove logical HW ID"). As we can now free the GEM context immediately from any context, remove the deferral of the free_list v2: Lift removing the context from the global list into close(). Suggested-by:
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Chris Wilson authored
When inserting a VMA, we restrict the placement to the low 4G unless the caller opts into using the full range. This was done to allow usersapce the opportunity to transition slowly from a 32b address space, and to avoid breaking inherent 32b assumptions of some commands. However, for insert we limited ourselves to 4G-4K, but on verification we allowed the full 4G. This causes some attempts to bind a new buffer to sporadically fail with -ENOSPC, but at other times be bound successfully. commit 48ea1e32 ("drm/i915/gen9: Set PIN_ZONE_4G end to 4GB - 1 page") suggests that there is a genuine problem with stateless addressing that cannot utilize the last page in 4G and so we purposefully excluded it. This means that the quick pin pass may cause us to utilize a buggy placement. Reported-by:
CQ Tang <cq.tang@intel.com> Testcase: igt/gem_exec_params/larger-than-life-batch Fixes: 48ea1e32 ("drm/i915/gen9: Set PIN_ZONE_4G end to 4GB - 1 page") Signed-off-by:
Matthew Auld <matthew.auld@intel.com> Cc: <stable@vger.kernel.org> # v4.5+ Link: https://patchwork.freedesktop.org/patch/msgid/20201216092951.7124-1-chris@chris-wilson.co.uk
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- 15 Dec, 2020 1 commit
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José Roberto de Souza authored
Commit 70a2b431 ("drm/i915/gt: Rename lrc.c to execlists_submission.c") renamed intel_lrc.c to intel_execlists_submission.c but forgot to update i915.rst. Fixes: 70a2b431 ("drm/i915/gt: Rename lrc.c to execlists_submission.c") Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
José Roberto de Souza <jose.souza@intel.com> Reviewed-by:
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- 14 Dec, 2020 3 commits
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Tvrtko Ursulin authored
Chris spotted that since 16ffe73c ("drm/i915/pmu: Use GT parked for estimating RC6 while asleep") we don't rely on runtime pm internals when estimating RC6 while asleep. We can remove the ifdef code to simplify and at the same time wake up the device less when querying RC6 if CONFIG_PM is not compiled in. Signed-off-by:
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Tvrtko Ursulin authored
RC6 is a hardware counter and as such estimating it using the raw clock during runtime suspend is more appropriate. Signed-off-by:
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Tvrtko Ursulin authored
Chris found a CI report which points out calling intel_runtime_pm_get from inside i915_pmu_enable hook is not allowed since it can be invoked from hard irq context. This is something we knew but forgot, so lets fix it once again. We do this by syncing the internal book keeping with hardware rc6 counter on driver load. v2: * Always sync on parking and fully sync on init. Signed-off-by:
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- 10 Dec, 2020 3 commits
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Chris Wilson authored
The workarounds are tied to the GT and we should derive the tests local to the GT. Signed-off-by:
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Chris Wilson authored
When we reset the legacy ring context, due to potential corruption over suspend/resume, remove the valid bit so that we avoid loading garbage. Signed-off-by:
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John Harrison authored
The above workaround was added as an engine workaround not a GT workaround. Moved it to the correct location. Signed-off-by:
John Harrison <John.C.Harrison@Intel.com> Reviewed-by:
Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reviewed-by:
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- 09 Dec, 2020 9 commits
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Daniele Ceraolo Spurio authored
These functions are independent from the backend used and can therefore be split out of the exelists submission file, so they can be re-used by the upcoming GuC submission backend. Based on a patch by Chris Wilson. Signed-off-by:
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Chris Wilson authored
We want to separate the utility functions for controlling the logical ring context from the execlists submission mechanism (which is an overgrown scheduler). This is similar to Daniele's work to split up the files, but being selfish I wanted to base it after my own changes to intel_lrc.c petered out. Signed-off-by:
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Chris Wilson authored
Cleanup intel_lrc.h by moving some of the residual common register definitions into intel_lrc_reg.h, prior to rebranding and splitting off the submission backends. v2: keep the SCHEDULE enum in the old file, since it is specific to the gvt usage of the execlists submission backend (John) Signed-off-by:
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Chris Wilson authored
Now that the only user of the uninterruptible wait was eliminated, remove the support. Signed-off-by:
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Chris Wilson authored
Tigerlake is plagued by spontaneous DMAR faults [reason 7, next page table ptr is invalid] which lead to GPU hangs. These faults occur when an iommu map is immediately reused. Adding further clflushes and barriers around either the GTT PTE or iommu PTE updates do not prevent the faults. So far the only effect has been from inducing a delay between reuse of the iommu on the GPU, and applying the delay at the iommu map allows for the smallest stable delay. Note that such a delay is hideous and clearly does not fix the root cause, and so should only be a bandaid until a complete solution is found. The delay was determined by running igt/gem_exec_fence/parallel in a loop for a few hours (unpatched MTBF is about 10s). We have also seen such DMAR fault [reason 7] errors on other platforms, notably gen9-gen11, but so far it has only been trivially and consistently reproduced on Tigerlake. v2: Leave a tell-tale to know when we apply the vt'd quirk, and as a reminder to remove it again. Hopefully. Testcase: igt/gem_exec_fence/parallel Signed-off-by:
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Chris Wilson authored
A call to wait for the GT to idle from inside the put_pages fallback is prone to cause an uninterruptible livelock. As it does not provide adequate serialisation with new requests, simply fallback to a trivial sleep. Signed-off-by:
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Lucas De Marchi authored
Document what a masked register is according to bspec so we avoid developers using the wrong functions to implement WAs. Signed-off-by:
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Lucas De Marchi authored
The use of "masked" in this function is due to its history. Once upon a time it received a mask and a value as parameter. Since commit eeec73f8 ("drm/i915/gt: Skip rmw for masked registers") that is not true anymore and now there is a clear and a set parameter. Depending on the case, that can still be thought as a mask and value, but there are some subtle differences: what we clear doesn't need to be the same bits we are setting, particularly when we are using masked registers. The fact that we also have "masked registers", i.e. registers whose mask is stored in the upper 16 bits of the register, makes it even more confusing, because "masked" in wa_write_masked_or() has little to do with masked registers, but rather refers to the old mask parameter the function received (that can also, but not exclusively, be used to write to masked register). Avoid the ambiguity and misnomer by renaming it to something else, hopefully less confusing: wa_write_clr_set(), to designate that we are doing both clr and set operations in the register. Signed-off-by:
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Lucas De Marchi authored
When using masked registers, there is nothing to clear since a masked register has the mask in the upper 16b: we can just write to the location we want and use the mask to control what bits we are writing to. However that doesn't mean we don't want to read back the register and check the value actually matched what we wanted to write, i.e. that the WA stick. That should be an explicit opt-out for registers that are either write-only or that are affected by hardware misbehavior. Moreover both wa_masked_en() and wa_masked_dis() check the WA stick, so skipping the check just because the field is more than 1 bit is surprising and error-prone. Signed-off-by:
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- 08 Dec, 2020 1 commit
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Chris Wilson authored
Closed vma are protected by the GT wakeref held as we lookup the vma, so we know that the vma will not be freed as we process it for the execbuf. Instead we expect to catch the closed status of the context, and simply allow the close-race on an individual vma to be washed away. Longer term, the GT wakeref protection will be removed by explicit vma.kref tracking. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2245Signed-off-by:
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- 07 Dec, 2020 2 commits
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Chris Wilson authored
When we fail to find a single block large enough to require splitting, report the largest block we did find. Signed-off-by:
Ramalingam C <ramalingam.c@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201207130346.11849-1-chris@chris-wilson.co.uk
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Colin Ian King authored
Currently the check that the unsigned size_t variable i is >= 0 is always true because the unsigned variable will never be negative, causing the loop to run forever. Fix this by changing the pre-decrement check to a zero check on i followed by a decrement of i. Addresses-Coverity: ("Unsigned compared against 0") Fixes: bfed6708 ("drm/i915: use vmap in shmem_pin_map") Signed-off-by:Colin Ian King <colin.king@canonical.com> Reviewed-by:
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- 05 Dec, 2020 4 commits
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Lucas De Marchi authored
Remove the last macro and implement it as a function like the rest of the operations that don't assume there is a `wal` list, but rather receive it as argument. Signed-off-by:
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Lucas De Marchi authored
Just ommitting the list it's operating on doesn't save much typing and adds another way to do the same thing. Just replace it with wa_masked_dis(). Signed-off-by:
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Lucas De Marchi authored
Just ommitting the list it's operating on doesn't save much typing and adds another way to do the same thing. Just replace it with wa_masked_en(). Signed-off-by:
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Swathi Dhanavanthri authored
Set GS Timer to 224 to prevent a HS/DS hang. Bspec: 53508 v2: reword commit message and add comment explaining why read verification is ignored (Chris) Cc: Matt Roper <matthew.d.roper@intel.com> Signed-off-by:
Swathi Dhanavanthri <swathi.dhanavanthri@intel.com> Signed-off-by:
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- 04 Dec, 2020 5 commits
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Chris Wilson authored
Across a reset, we stop the engine but not the timers. This leaves a window where the timers have inconsistent state with the engine, but should only result in a spurious timeout. As we cancel the outstanding events, also cancel their timers. Signed-off-by:
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Chris Wilson authored
The GT and engine reset failures are completely invisible when looking at a trace for a bug, but are vital to understanding the incomplete flow. Signed-off-by:
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Chris Wilson authored
We currently presume that the engine reset is successful, cancelling the expired preemption timer in the process. However, engine resets can fail, leaving the timeout still pending and we will then respond to the timeout again next time the tasklet fires. What we want is for the failed engine reset to be promoted to a full device reset, which is kicked by the heartbeat once the engine stops processing events. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1168 Fixes: 3a7a92ab ("drm/i915/execlists: Force preemption") Signed-off-by:
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Chris Wilson authored
Before reseting the engine, we suspend the execution of the guilty request, so that we can continue execution with a new context while we slowly compress the captured error state for the guilty context. However, if the reset fails, we will promptly attempt to reset the same request again, and discover the ongoing capture. Ignore the second attempt to suspend and capture the same request. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1168 Fixes: 32ff621f ("drm/i915/gt: Allow temporary suspension of inflight requests") Signed-off-by:
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Chris Wilson authored
In the course of discovering and closing many races with context closure and execbuf submission, since commit 61231f6b ("drm/i915/gem: Check that the context wasn't closed during setup") we started checking that the context was not closed by another userspace thread during the execbuf ioctl. In doing so we cancelled the inflight request (by telling it to be skipped), but kept reporting success since we do submit a request, albeit one that doesn't execute. As the error is known before we return from the ioctl, we can report the error we detect immediately, rather than leave it on the fence status. With the immediate propagation of the error, it is easier for userspace to handle. Fixes: 61231f6b ("drm/i915/gem: Check that the context wasn't closed during setup") Testcase: igt/gem_ctx_exec/basic-close-race Signed-off-by:
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- 03 Dec, 2020 1 commit
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Dan Carpenter authored
There is a copy and paste bug in this code. It's supposed to check "obj2" instead of checking "obj" a second time. Fixes: 80f0b679 ("drm/i915: Add an implementation for i915_gem_ww_ctx locking, v2.") Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by:
Andi Shyti <andi.shyti@intel.com> Signed-off-by:
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- 02 Dec, 2020 1 commit
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Chris Wilson authored
Mixing I915_ALLOC_CONTIGUOUS and I915_ALLOC_MAX_SEGMENT_SIZE fared badly. The two directives conflict, with the contiguous request setting the min_order to the full size of the object, and the max-segment-size setting the max_order to the limit of the DMA mapper. This results in a situation where max_order < min_order, causing our sanity checks to fail. Instead of limiting the buddy block size, in the previous patch we split the oversized buddy into multiple scatterlist elements. Fixes: d2cf0125 ("drm/i915/lmem: Limit block size to 4G") Signed-off-by:
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