- 08 Feb, 2019 9 commits
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Chris Wilson authored
Previously, we were able to rely on the recursive properties of struct_mutex to allow us to serialise revoking mmaps and reacquiring the FENCE registers with them being clobbered over a global device reset. I then proceeded to throw out the baby with the bath water in order to pursue a struct_mutex-less reset. Perusing LWN for alternative strategies, the dilemma on how to serialise access to a global resource on one side was answered by https://lwn.net/Articles/202847/ -- Sleepable RCU: 1 int readside(void) { 2 int idx; 3 rcu_read_lock(); 4 if (nomoresrcu) { 5 rcu_read_unlock(); 6 return -EINVAL; 7 } 8 idx = srcu_read_lock(&ss); 9 rcu_read_unlock(); 10 /* SRCU read-side critical section. */ 11 srcu_read_unlock(&ss, idx); 12 return 0; 13 } 14 15 void cleanup(void) 16 { 17 nomoresrcu = 1; 18 synchronize_rcu(); 19 synchronize_srcu(&ss); 20 cleanup_srcu_struct(&ss); 21 } No more worrying about stop_machine, just an uber-complex mutex, optimised for reads, with the overhead pushed to the rare reset path. However, we do run the risk of a deadlock as we allocate underneath the SRCU read lock, and the allocation may require a GPU reset, causing a dependency cycle via the in-flight requests. We resolve that by declaring the driver wedged and cancelling all in-flight rendering. v2: Use expedited rcu barriers to match our earlier timing characteristics. v3: Try to annotate locking contexts for sparse v4: Reduce selftest lock duration to avoid a reset deadlock with fences v5: s/srcu/reset_backoff_srcu/ v6: Remove more stale comments Testcase: igt/gem_mmap_gtt/hang Fixes: eb8d0f5a ("drm/i915: Remove GPU reset dependence on struct_mutex") Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190208153708.20023-2-chris@chris-wilson.co.uk
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Chris Wilson authored
Currently, we may simultaneously release the fence register from both fence_update() and i915_gem_restore_fences(). This is dangerous, so defer the bookkeeping entirely to i915_gem_restore_fences() when the device is asleep. Reported-by:
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Ville Syrjälä authored
On g4x+ we depend on the primary plane DSPCNTR gamma/csc enable bits for the pipe bottom color. To guarantee that those are correct already when enabling the crtc let's do an explicit ->disable_plane() call before enabling the pipe. On skl+ this will be handled by the explicit PIPE_BOTTOM_COLOR register which is already part of the normal color commit we do durign crtc enable. Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by:
Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190207202146.26423-8-ville.syrjala@linux.intel.com
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Ville Syrjälä authored
Planes scanning out C8 will want to use the legacy lut as their palette. That means the LUT content are unlikely to be useful for gamma correction on other planes. Thus we should disable pipe gamma for all the other planes. And we should reject any non legacy LUT configurations when C8 planes are present. Fixes the appearance of the hw cursor when running X -depth 8. Note that CHV with it's independent CGM degamma/gamma LUTs could probably use the CGM for gamma correction even when the legacy LUT is used for C8. But that would require a new uapi for configuring the legacy LUT and CGM LUTs at the same time. Totally not worth it. v2: Fix typo (Uma) Rebase Signed-off-by:Uma Shankar <uma.shankar@intel.com> Reviewed-by:
Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190207202146.26423-7-ville.syrjala@linux.intel.com
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Ville Syrjälä authored
As with pipe gamma we can avoid the potential precision loss from the pipe csc unit when there is no need to use it. And again we need the same logic for updating the planes. v2: Rebase Signed-off-by:
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Ville Syrjälä authored
The pipe internal precision is higher than what we currently program to the degamma/gamma LUTs. We can get a higher quality image by bypassing the LUTs when they're not needed. Let's do that. Each plane has its own control bit for this, so we have to update all active planes. The way we've done this we don't actually have to run through the whole .check_plane() thing. And we actually do the .color_check() after .check_plane() so we couldn't even do that without shuffling the code around. Additionally on pre-skl we have to update the primary plane regardless of whether it's active or not on account of the primary plane gamma enable bit also affecting the pipe bottom color. v2: Drop the '.' from patch title (Uma) Fix 'primayr' typo (Uma,Matt) Rebase Signed-off-by: -
Ville Syrjälä authored
Just like we did for pipe gamma, let's also track the pipe csc state. The hardware only exists on ILK+, and currently we always enable it on hsw+ and never on any other platforms. Just like with pipe gamma, the primary plane control register is used for the readout on pre-SKL, and the pipe bottom color register on SKL+. v2: Rebase v3: Allow fastboot with csc_enable changes (Maarten) Deal with HAS_GMCH Signed-off-by: -
Ville Syrjälä authored
Track whether pipe gamma is enabled or disabled. For now we stick to the current behaviour of always enabling gamma. But we do get working state readout for this now. On SKL+ we use the pipe bottom color as our hardware state. On pre-SKL we read the state back from the primary plane control register. That only really correct for g4x+, as older platforms never gamma correct pipe bottom color. But doing the readout the same way on all platforms is fine, and there is no other way to do it really. v2: Initialize val at declaration (Uma) Drop the bogus skl scaler comment change (Uma) Rebase v3: Allow fastboot with gamma_enable changes (Maarten) v4: Drop the PIPE_BOTTOM_COLOR write from intel_update_pipe_config() again. It snuck back in during the rebase Signed-off-by: -
Ville Syrjälä authored
On pre-HSW gamma mode is configured via PIPECONF. The bits are the same except shifted up, so we can reuse just store them in crtc_state->gamma_mode in the HSW+ way, allowing us to share some code later. v2: Allow fastboot with gamma_mode changes (Maarten) Add space around the '<<' in the reg macro Deal with HAS_GMCH Signed-off-by:
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- 07 Feb, 2019 13 commits
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José Roberto de Souza authored
Changing the i915_edp_psr_debug was enabling, disabling or switching PSR version by directly calling intel_psr_disable_locked() and intel_psr_enable_locked(), what is not the default PSR path that will be executed by real users. So lets force a fastset in the PSR CRTC to trigger a pipe update and stress the default code path. Recently a bug was found when switching from PSR2 to PSR1 while enable_psr kernel parameter was set to the default parameter, this changes fix it and also fixes the bug linked bellow were DRRS was left enabled together with PSR when enabling PSR from debugfs. v2: Handling missing case: disabled to PSR1 v3: Not duplicating the whole atomic state(Maarten) v4: Adding back the missing call to intel_psr_irq_control(Dhinakaran) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108341 Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by:
José Roberto de Souza <jose.souza@intel.com> Reviewed-by:
Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190206211845.5322-1-jose.souza@intel.com
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Ramalingam C authored
The downgrade of the fullmodeset into fastset intel_encoder->update_pipe, in possible scenario, skips the En/Dis-able DDI. Hence breaks the HDCP state change handling. We also don't have any hdcp tests in CI, because the shard runs don't have hdcp capable outputs :-/ So this change fixs it by handling the HDCP state change request at intel_encoder->update_pipe too along with enable and disable of the DDI. Fixes: d19f958d ("drm/i915: Enable fastset for non-boot modesets.") v2: Added commit id that broke the HDCP [Daniel] Signed-off-by:
Ramalingam C <ramalingam.c@intel.com> cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> cc: Hans de Goede <hdegoede@redhat.com> cc: Daniel Vetter <daniel.vetter@intel.com> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/1549295080-18353-1-git-send-email-ramalingam.c@intel.com
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Rodrigo Vivi authored
Signed-off-by:Rodrigo Vivi <rodrigo.vivi@intel.com>
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Ville Syrjälä authored
The LUTs are single buffered so we should program them after the double buffered pipe updates have been latched by the hardware. We'll also fix up the IPS vs. split gamma w/a to do the IPS disable like everyone else. Note that this is currently dead code as we don't use the split gamma mode on HSW, but that will be fixed up shortly. Signed-off-by:
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Ville Syrjälä authored
Split the color management hooks along the single vs. double buffered registers line. Of the currently programmed registers GAMMA_MODE and the ilk+ pipe CSC are double buffered, the LUTS and CHV CGM block are single buffered. The double buffered register will be programmed during the normal pipe update with evasion, and also during pipe enable so that the settings will already be correct when the pipe starts up before the planes are enabled. The single buffered registers are currently programmed before the vblank evade. Which is totally wrong, but we'll correct that later. v2: Add some docs to explain the two vfuncs (Matt,Uma) Rebase Signed-off-by: -
Ville Syrjälä authored
For bdw+ let's move the GAMMA_MODE write for the legacy LUT mode into the .load_luts() funciton directly, rather than relying on haswell_load_luts(). We'll be getting rid of haswell_load_luts() entirely soon, and it's anyway cleaner to have the GAMMA_MODE write in a single place. Signed-off-by:
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Ville Syrjälä authored
Pass the crtc state etc. as const to the color management commit functions. And while at it polish some of the local variables. v2: Rebase Signed-off-by:
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Ville Syrjälä authored
We shouldn't be computing gamma mode during the commit phase. Move it to the check phase. v2: Reword comments a bit (Matt) Rebase Signed-off-by: -
Ville Syrjälä authored
On g4x+ the pipe gamma enable bit for the primary plane affects the pipe bottom color as well. The same for the pipe csc enable bit on ilk+. Thus we must configure those bits correctly even when the primary plane is disabled. To make the feasible let's split those settings from the plane_ctl() function into a seprate funciton that we can call from the ->disable_plane() hook as well. For consistency we'll do that on all the plane types. While that has no real benefits at this time, it'll become useful when we start to control the pipe gamma/csc enable bits dynamically when we overhaul the color management code. On pre-g4x there doesn't appear to be any way to gamma correct the pipe bottom color, but sticking to the same pattern doesn't hurt. And it'll still help us to do crtc state readout correctly for the pipe gamma enable bit for the color management overhaul. An alternative apporach would be to still precompute these bits into plane_state->ctl, but that would require that we run through the plane check even when the plane isn't logically enabled on any crtc. Currently that condition causes us to short circuit the entire thing and not call ->check_plane(). There would also be some chicken and egg problems with ->check_plane() vs. crtc color state check that would requite splitting certain things into multiple steps. So all in all this seems like the easier route. Signed-off-by:
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Ville Syrjälä authored
update_wm_post is meant for pre-g4x only. Don't ever set it on g4x+. The only effect of a bogus update_wm_post on g4x+ could be that we clear the legacy_cursor_update flag in intel_atomic_commit(). Since legacy_cursor_update is only set for legacy cursor updates (as the name suggests) and we only set update_wm_post for a modeset the two cases should never occur at the same time. But let's be consistent in setting update_wm_post so we don't end up confusing so many people. Signed-off-by:
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Chris Wilson authored
Apply backpressure to hogs that emit requests faster than the GPU can process them by waiting for their ring to be less than half-full before proceeding with taking the struct_mutex. This is a gross hack to apply throttling backpressure, the long term goal is to remove the struct_mutex contention so that each client naturally waits, preferably in an asynchronous, nonblocking fashion (pipelined operations for the win), for their own resources and never blocks another client within the driver at least. (Realtime priority goals would extend to ensuring that resource contention favours high priority clients as well.) This patch only limits excessive request production and does not attempt to throttle clients that block waiting for eviction (either global GTT or system memory) or any other global resources, see above for the long term goal. No microbenchmarks are harmed (to the best of my knowledge). Testcase: igt/gem_exec_schedule/pi-ringfull-* Signed-off-by:
Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190207071829.5574-1-chris@chris-wilson.co.uk
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Joonas Lahtinen authored
Add err goto label and use it when VMA can't be established or changes underneath. v2: - Dropping Fixes: as it's indeed impossible to race an object to the error address. (Chris) v3: - Use IS_ERR_VALUE (Chris) Reported-by:
Adam Zabrocki <adamza@microsoft.com> Signed-off-by:
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Joonas Lahtinen authored
Make sure the underlying VMA in the process address space is the same as it was during vm_mmap to avoid applying WC to wrong VMA. A more long-term solution would be to have vm_mmap_locked variant in linux/mmap.h for when caller wants to hold mmap_sem for an extended duration. v2: - Refactor the compare function Fixes: 1816f923 ("drm/i915: Support creation of unbound wc user mappings for objects") Reported-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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- 06 Feb, 2019 6 commits
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Lyude Paul authored
This hotplug also isn't needed: drm_dp_mst_topology_mgr_set_mst() already sends a hotplug on its own from drm_dp_destroy_connector_work() after destroying connectors in the MST topology. Signed-off-by:
Lyude Paul <lyude@redhat.com> Cc: Imre Deak <imre.deak@intel.com> Cc: Daniel Vetter <daniel@ffwll.ch> Reviewed-by:
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Lyude Paul authored
We have a bad habit of calling drm_fb_helper_hotplug_event() far more then we actually need to. MST appears to be one of these cases, where we call drm_fb_helper_hotplug_event() if we fail to resume a connected MST topology in intel_dp_mst_resume(). We don't actually need to do this at all though since hotplug events are already sent from drm_dp_connector_destroy_work() every time connectors are unregistered from userspace's PoV. Additionally, extra calls to drm_fb_helper_hotplug_event() also just mean more of a chance of doing a connector probe somewhere we shouldn't. So, don't send any hotplug events during resume if the MST topology fails to come up. Just rely on the DP MST helpers to send them for us. Signed-off-by:
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Lyude Paul authored
When resuming, we check whether or not any previously connected MST topologies are still present and if so, attempt to resume them. If this fails, we disable said MST topologies and fire off a hotplug event so that userspace knows to reprobe. However, sending a hotplug event involves calling drm_fb_helper_hotplug_event(), which in turn results in fbcon doing a connector reprobe in the caller's thread - something we can't do at the point in which i915 calls drm_dp_mst_topology_mgr_resume() since hotplugging hasn't been fully initialized yet. This currently causes some rather subtle but fatal issues. For example, on my T480s the laptop dock connected to it usually disappears during a suspend cycle, and comes back up a short while after the system has been resumed. This guarantees pretty much every suspend and resume cycle, drm_dp_mst_topology_mgr_set_mst(mgr, false); will be caused and in turn, a connector hotplug will occur. Now it's Rute Goldberg time: when the connector hotplug occurs, i915 reprobes /all/ of the connectors, including eDP. However, eDP probing requires that we power on the panel VDD which in turn, grabs a wakeref to the appropriate power domain on the GPU (on my T480s, this is the PORT_DDI_A_IO domain). This is where things start breaking, since this all happens before intel_power_domains_enable() is called we end up leaking the wakeref that was acquired and never releasing it later. Come next suspend/resume cycle, this causes us to fail to shut down the GPU properly, which causes it not to resume properly and die a horrible complicated death. (as a note: this only happens when there's both an eDP panel and MST topology connected which is removed mid-suspend. One or the other seems to always be OK). We could try to fix the VDD wakeref leak, but this doesn't seem like it's worth it at all since we aren't able to handle hotplug detection while resuming anyway. So, let's go with a more robust solution inspired by nouveau: block fbdev from handling hotplug events until we resume fbdev. This allows us to still send sysfs hotplug events to be handled later by user space while we're resuming, while also preventing us from actually processing any hotplug events we receive until it's safe. This fixes the wakeref leak observed on the T480s and as such, also fixes suspend/resume with MST topologies connected on this machine. Changes since v2: * Don't call drm_fb_helper_hotplug_event() under lock, do it after lock (Chris Wilson) * Don't call drm_fb_helper_hotplug_event() in intel_fbdev_output_poll_changed() under lock (Chris Wilson) * Always set ifbdev->hpd_waiting (Chris Wilson) Signed-off-by:
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Ville Syrjälä authored
The unused bits on PLANE_WM & co. are hardwired to zero. So no need to worry about reading the extra bit on pre-icl. Signed-off-by:
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Ville Syrjälä authored
On icl the plane watermark blocks field is 11 bits. Bump our define to match so that readout won't ignore the extra bit. We can safely do this for older platforms too since the unused bits are hardwired to zero. Cc: José Roberto de Souza <jose.souza@intel.com> Signed-off-by:
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Tvrtko Ursulin authored
Enable count array is supposed to have one counter for each possible engine sampler. As such, array sizing and bounds checking is not correct and would blow up the asserts if more samplers were added. No ill-effect in the current code base but lets fix it for correctness. At the same time tidy the assert for readability and robustness. v2: * One check per assert. (Chris Wilson) Signed-off-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Fixes: b46a33e2 ("drm/i915/pmu: Expose a PMU interface for perf queries") Reviewed-by:
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- 05 Feb, 2019 12 commits
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Ville Syrjälä authored
Disabling WM1+ on ICL causes tons of underruns with linear/X-tiled framebuffers. We can avoid this by flipping on a chicken bit affecting the way the hw fill the FIFO. This may not be the final solution but should hopefully avoid some underruns in the meantime. v2: Apparently PIPE_CHICKEN is icl+ only Signed-off-by:
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Ville Syrjälä authored
Configure PIPE_CHICKEN during intel_update_pipe_config() to make sure we have our chickens in a row with fastboot too. v2: Apparently PIPE_CHICKEN is icl+ only Signed-off-by:
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Ville Syrjälä authored
We need configure PIPE_CHICKEN during fastboot as well. Let's extract it to a helper. v2: Apparently PIPE_CHICKEN is icl+ only Signed-off-by:
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Ville Syrjälä authored
When adding the early latency==0 check back I neglected to realize that we no longer have a way to return a failure from the wm computation like we had in the past (since we now calculate wms before ddb allocations). Also plane_en being false doesn't actually indicate that the level is invalid as it wil also happen when the plane is not enabled. skl_allocate_pipe_ddb() starts scanning from the maximum watermark level and it stops as soon as it finds a level that is deemed viable. The assumption being that if level n+1 is valid then level n is valid as well. Thus if we now disable any watermark level by zeroing its latency the code will think that level to be actually valid and won't confirm whether the actually enabled lower watermark level(s) actually fit into the allotted ddb space. This results in hilarious watermark values that exceed the ddb allocation of the plane. The way we must now indicate a failure is to assign an unreasoanbly big value to min_ddb_alloc which will then make skl_allocate_pipe_ddb() reject the entire level. v2: Also do the same for the lines>31 case (Matt) v3: Make 'blocks' u32 (Matt) Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> Reviewed-by:
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Chris Wilson authored
clear_intel_crtc_state() uses the stack for saving a temporary copy of certain bits of the inherited crtc_state before clearing the unwanted bits. This pushes it over the stack limit for my little 32b Pineview, so move the temporary allocation to the heap instead. As we now use a zeroed struct, we can copy the whole extended state back to both preserve what bits need to be preserved and zero the rest. Signed-off-by:
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Ville Syrjälä authored
We generally omit register polling from the i915_reg_rw tracepoint. Understandable since polling could generate a lot of noise in the trace. The downside is that the trace is incomplete. As a compromise let's trace the final register value observed while polling. That should be generally sufficient to observe what the code should be doing next. I suppose in some cases it might make sense to also trace the initial register value, and maybe the number of times we polled. But that would require a separate tracepoint so let's leave it for the future. The other users of _NOTRACE() are i915_pmu and i2c bitbanging, which I decided to leave alone. Next we should do something to claw back the tracepoints for planes and whatnot which were switched to _FW() a while back. I guess just new macros for raw_rw+trace. The question is what to call it? Signed-off-by:
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Greg Kroah-Hartman authored
When calling debugfs functions, they can now return error values if something went wrong. If that happens, return a NULL as a *dentry to the relay core instead of passing it an illegal pointer. The relay core should be able to handle an illegal pointer, but add this check to be safe. Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by:
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Rodrigo Vivi authored
First of all GMCH can be considered a feature by itself since it is a chip present in some platforms that connects the IA processor to memory and other components in PC. Also with the introduction of display block at device info, we got a redundant definition: .display.has_gmch_display = 1, So, let's clean up things a bit and use the standardized way of has_feature on displays side. No functional change and no manual interaction to generate this patch. It is only: sed -si -e 's/has_gmch_display/has_gmch/g' \ -e 's/HAS_GMCH_DISPLAY/HAS_GMCH/g' drivers/gpu/drm/i915/*{c,h} Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: -
Chris Wilson authored
Looking forward, we need to break the struct_mutex dependency on i915_gem_active. In the meantime, external use of i915_gem_active is quite beguiling, little do new users suspect that it implies a barrier as each request it tracks must be ordered wrt the previous one. As one of many, it can be used to track activity across multiple timelines, a shared fence, which fits our unordered request submission much better. We need to steer external users away from the singular, exclusive fence imposed by i915_gem_active to i915_active instead. As part of that process, we move i915_gem_active out of i915_request.c into i915_active.c to start separating the two concepts, and rename it to i915_active_request (both to tie it to the concept of tracking just one request, and to give it a longer, less appealing name). Signed-off-by:
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Chris Wilson authored
Wrap the active tracking for a GPU references in a slabcache for faster allocations, and hopefully better fragmentation reduction. v3: Nothing device specific left, it's just a slabcache that we can make global. v4: Include i915_active.h and don't put the initfunc under DEBUG_GEM Signed-off-by:
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Chris Wilson authored
As soon as we detect that the active tracker is idle and we prepare to call the retire callback, release the storage for our tree of per-timeline nodes. We expect these to be infrequently used and quick to allocate, so there is little benefit in keeping the tree cached and we would prefer to return the pages back to the system in a timely fashion. This also means that when we finalize the struct as a whole, we know as the activity tracker must be idle, the tree has already been released. Indeed we can reduce i915_active_fini() just to the assertions that there is nothing to do. Signed-off-by:
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Chris Wilson authored
We currently track GPU memory usage inside VMA, such that we never release memory used by the GPU until after it has finished accessing it. However, we may want to track other resources aside from VMA, or we may want to split a VMA into multiple independent regions and track each separately. For this purpose, generalise our request tracking (akin to struct reservation_object) so that we can embed it into other objects. v2: Tweak error handling during selftest setup. Signed-off-by:
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