On 10/25/2021 02:37, Joonas Lahtinen wrote:
Quoting Matthew Brost (2021-10-22 19:42:19)
On Fri, Oct 22, 2021 at 12:35:04PM +0300, Joonas Lahtinen wrote:
Hi Matt & John,
Can you please queue patches with the right Fixes: references to convert all the GuC tracepoints to be protected by the LOW_LEVEL_TRACEPOINTS protection for now. Please do so before next Wednesday so we get it queued in drm-intel-next-fixes.
Don't we already do that? I checked i915_trace.h and every tracepoint I added (intel_context class, i915_request_guc_submit) is protected by LOW_LEVEL_TRACEPOINTS.
The only thing I changed outside of that protection is adding the guc_id field to existing i915_request class tracepoints.
It's the first search hit for "guc" inside the i915_trace.h file :)
Without the guc_id in those tracepoints these are basically useless with GuC submission. We could revert that if it is a huge deal but as I said then they are useless...
Let's eliminate it for now and restore the tracepoint exactly as it was.
For what purpose?
Your request above was about not adding new tracepoints outside of a low level CONFIG setting. I can understand that on the grounds of not swamping high level tracing with low level details that are not important to the general developer.
But this is not about adding extra tracepoints, this is about making the existing tracepoints usable. With GuC submission, the GuC id is a vital piece of information. Without that, you cannot correlate anything that is happening between i915, GuC and the hardware. Which basically means that for a GuC submission based platform, those tracepoints are useless without this information. And GuC submission is POR for all platforms from ADL-P/DG1 onwards. So by not allowing this update, you are preventing any kind of meaningful debug of any scheduling/execution type issues.
Again, if you are wanting to reduce spam in higher level debug then sure, make the entire set of scheduling tracepoints LOW_LEVEL only. But keeping them around in a censored manner is pointless. They are not ABI, they are allowed to change as and when necessary. And now, it is necessary to update them to match the new POR submission model for current and all future platforms.
If there is an immediate need, we should instead have an auxilary tracepoint which is enabled only through LOW_LEVEL_TRACEPOINTS and that amends the information of the basic tracepoint.
For the longer term solution we should align towards the dma fence tracepoints. When those are combined with the OA information, one should be able to get a good understanding of both the software and hardware scheduling decisions.
I don't follow this. OA information does not tell you any details of what the GuC is doing. DRM/DMA generic tracepoints certainly won't tell you any hardware/firmware or even i915 specific information.
And that is a much longer term goal than being able to debug current platforms with the current driver.
John.
Regards, Joonas
Matt
There's the orthogonal track to discuss what would be the stable set of tracepoints we could expose. However, before that discussion is closed, let's keep a rather strict line to avoid potential maintenance burned.
We can then relax in the future as needed.
Regards, Joonas
Quoting Matthew Brost (2021-06-24 10:04:29)
As discussed in [1], [2] we are enabling GuC submission support in the i915. This is a subset of the patches in step 5 described in [1], basically it is absolute to enable CI with GuC submission on gen11+ platforms.
This series itself will likely be broken down into smaller patch sets to merge. Likely into CTBs changes, basic submission, virtual engines, and resets.
A following series will address the missing patches remaining from [1].
Locally tested on TGL machine and basic tests seem to be passing.
Signed-off-by: Matthew Brost matthew.brost@intel.com
[1] https://patchwork.freedesktop.org/series/89844/ [2] https://patchwork.freedesktop.org/series/91417/
Daniele Ceraolo Spurio (1): drm/i915/guc: Unblock GuC submission on Gen11+
John Harrison (10): drm/i915/guc: Module load failure test for CT buffer creation drm/i915: Track 'serial' counts for virtual engines drm/i915/guc: Provide mmio list to be saved/restored on engine reset drm/i915/guc: Don't complain about reset races drm/i915/guc: Enable GuC engine reset drm/i915/guc: Fix for error capture after full GPU reset with GuC drm/i915/guc: Hook GuC scheduling policies up drm/i915/guc: Connect reset modparam updates to GuC policy flags drm/i915/guc: Include scheduling policies in the debugfs state dump drm/i915/guc: Add golden context to GuC ADS
Matthew Brost (36): drm/i915/guc: Relax CTB response timeout drm/i915/guc: Improve error message for unsolicited CT response drm/i915/guc: Increase size of CTB buffers drm/i915/guc: Add non blocking CTB send function drm/i915/guc: Add stall timer to non blocking CTB send function drm/i915/guc: Optimize CTB writes and reads drm/i915/guc: Add new GuC interface defines and structures drm/i915/guc: Remove GuC stage descriptor, add lrc descriptor drm/i915/guc: Add lrc descriptor context lookup array drm/i915/guc: Implement GuC submission tasklet drm/i915/guc: Add bypass tasklet submission path to GuC drm/i915/guc: Implement GuC context operations for new inteface drm/i915/guc: Insert fence on context when deregistering drm/i915/guc: Defer context unpin until scheduling is disabled drm/i915/guc: Disable engine barriers with GuC during unpin drm/i915/guc: Extend deregistration fence to schedule disable drm/i915: Disable preempt busywait when using GuC scheduling drm/i915/guc: Ensure request ordering via completion fences drm/i915/guc: Disable semaphores when using GuC scheduling drm/i915/guc: Ensure G2H response has space in buffer drm/i915/guc: Update intel_gt_wait_for_idle to work with GuC drm/i915/guc: Update GuC debugfs to support new GuC drm/i915/guc: Add several request trace points drm/i915: Add intel_context tracing drm/i915/guc: GuC virtual engines drm/i915: Hold reference to intel_context over life of i915_request drm/i915/guc: Disable bonding extension with GuC submission drm/i915/guc: Direct all breadcrumbs for a class to single breadcrumbs drm/i915/guc: Reset implementation for new GuC interface drm/i915: Reset GPU immediately if submission is disabled drm/i915/guc: Add disable interrupts to guc sanitize drm/i915/guc: Suspend/resume implementation for new interface drm/i915/guc: Handle context reset notification drm/i915/guc: Handle engine reset failure notification drm/i915/guc: Enable the timer expired interrupt for GuC drm/i915/guc: Capture error state on context reset
drivers/gpu/drm/i915/gem/i915_gem_context.c | 30 +- drivers/gpu/drm/i915/gem/i915_gem_context.h | 1 + drivers/gpu/drm/i915/gem/i915_gem_mman.c | 3 +- drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 6 +- drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 41 +- drivers/gpu/drm/i915/gt/intel_breadcrumbs.h | 14 +- .../gpu/drm/i915/gt/intel_breadcrumbs_types.h | 7 + drivers/gpu/drm/i915/gt/intel_context.c | 41 +- drivers/gpu/drm/i915/gt/intel_context.h | 31 +- drivers/gpu/drm/i915/gt/intel_context_types.h | 49 + drivers/gpu/drm/i915/gt/intel_engine.h | 72 +- drivers/gpu/drm/i915/gt/intel_engine_cs.c | 182 +- .../gpu/drm/i915/gt/intel_engine_heartbeat.c | 71 +- .../gpu/drm/i915/gt/intel_engine_heartbeat.h | 4 + drivers/gpu/drm/i915/gt/intel_engine_types.h | 12 +- .../drm/i915/gt/intel_execlists_submission.c | 234 +- .../drm/i915/gt/intel_execlists_submission.h | 11 - drivers/gpu/drm/i915/gt/intel_gt.c | 21 + drivers/gpu/drm/i915/gt/intel_gt.h | 2 + drivers/gpu/drm/i915/gt/intel_gt_pm.c | 6 +- drivers/gpu/drm/i915/gt/intel_gt_requests.c | 22 +- drivers/gpu/drm/i915/gt/intel_gt_requests.h | 9 +- drivers/gpu/drm/i915/gt/intel_lrc_reg.h | 1 - drivers/gpu/drm/i915/gt/intel_reset.c | 20 +- .../gpu/drm/i915/gt/intel_ring_submission.c | 28 + drivers/gpu/drm/i915/gt/intel_rps.c | 4 + drivers/gpu/drm/i915/gt/intel_workarounds.c | 46 +- .../gpu/drm/i915/gt/intel_workarounds_types.h | 1 + drivers/gpu/drm/i915/gt/mock_engine.c | 41 +- drivers/gpu/drm/i915/gt/selftest_context.c | 10 + drivers/gpu/drm/i915/gt/selftest_execlists.c | 20 +- .../gpu/drm/i915/gt/uc/abi/guc_actions_abi.h | 15 + drivers/gpu/drm/i915/gt/uc/intel_guc.c | 82 +- drivers/gpu/drm/i915/gt/uc/intel_guc.h | 106 +- drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c | 460 +++- drivers/gpu/drm/i915/gt/uc/intel_guc_ads.h | 3 + drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 318 ++- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h | 22 +- .../gpu/drm/i915/gt/uc/intel_guc_debugfs.c | 25 +- drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h | 88 +- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 2197 +++++++++++++++-- .../gpu/drm/i915/gt/uc/intel_guc_submission.h | 17 +- drivers/gpu/drm/i915/gt/uc/intel_uc.c | 102 +- drivers/gpu/drm/i915/gt/uc/intel_uc.h | 11 + drivers/gpu/drm/i915/i915_debugfs.c | 2 + drivers/gpu/drm/i915/i915_debugfs_params.c | 31 + drivers/gpu/drm/i915/i915_gem_evict.c | 1 + drivers/gpu/drm/i915/i915_gpu_error.c | 25 +- drivers/gpu/drm/i915/i915_reg.h | 2 + drivers/gpu/drm/i915/i915_request.c | 159 +- drivers/gpu/drm/i915/i915_request.h | 21 + drivers/gpu/drm/i915/i915_scheduler.c | 6 + drivers/gpu/drm/i915/i915_scheduler.h | 6 + drivers/gpu/drm/i915/i915_scheduler_types.h | 5 + drivers/gpu/drm/i915/i915_trace.h | 197 +- .../gpu/drm/i915/selftests/igt_live_test.c | 2 +- .../gpu/drm/i915/selftests/mock_gem_device.c | 3 +- 57 files changed, 4159 insertions(+), 787 deletions(-)
-- 2.28.0