- 14 May, 2020 20 commits
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Stanislav Lisovskiy authored
Starting from TGL we need to have a separate wm0 values for SAGV and non-SAGV which affects how calculations are done. v2: Remove long lines v3: Removed COLOR_PLANE enum references v4, v5, v6: Fixed rebase conflict v7: - Removed skl_plane_wm_level accessor from skl_allocate_pipe_ddb(Ville) - Removed sagv_uv_wm0(Ville) - can_sagv->use_sagv_wm(Ville) v8: - Moved tgl_crtc_can_enable_sagv function up(Ville) - Changed comment regarding pipe_wm usage(Ville) - Call intel_can_enable_sagv and tgl_compute_sagv_wm only for Gen12(Ville) - Some sagv debugs removed(Ville) - skl_print_wm_changes improvements(Ville) - Do assignment instead of memcpy in skl_pipe_wm_get_hw_state(Ville) v9: - Removed can_sagv variable(Ville) - Removed spurious line(Ville) - Changed u32 to unsigned int as agreed(Ville) - Assign sagv only for gen12 in skl_pipe_wm_get_hw_state(Ville) Signed-off-by:Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> [vsyrjala: Remove the dead 'return false' from intel_crtc_can_enable_sagv()] Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200514074853.9508-2-stanislav.lisovskiy@intel.com
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https://github.com/intel/gvt-linuxJoonas Lahtinen authored
gvt-next-2020-05-12 - Support PPGTT update via LRI cmd (Zhenyu) - Remove extra kmap for shadow ctx update (Zhenyu) - Move workload cleanup out of execlist handling code (Zhenyu) Signed-off-by:
Joonas Lahtinen <joonas.lahtinen@linux.intel.com> From: Zhenyu Wang <zhenyuw@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200512094017.GX18545@zhen-hp.sh.intel.com
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Gwan-gyeong Mun authored
In order to use a common VSC SDP Colorimetry calculating code on PSR, it uses a new psr vsc sdp compute routine. Because PSR routine has its own scenario and timings of writing a VSC SDP, the current PSR routine needs to have its own drm_dp_vsc_sdp structure member variable on struct i915_psr. In order to calculate colorimetry information, intel_psr_update() function and intel_psr_enable() function extend a drm_connector_state argument. There are no changes to PSR mechanism. v3: Replace a structure name to drm_dp_vsc_sdp from intel_dp_vsc_sdp v4: Rebased v8: Rebased v10: When a PSR is enabled, it needs to add DP_SDP_VSC to infoframes.enable. It is needed for comparing between HW and pipe_state of VSC_SDP. v11: If PSR is disabled by flag, it don't enable psr on pipe compute. v12: Fix an inconsistent indenting Signed-off-by:Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> Reviewed-by:
Uma Shankar <uma.shankar@intel.com> Reported-by:
kbuild test robot <lkp@intel.com> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200514060732.3378396-15-gwan-gyeong.mun@intel.com
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Gwan-gyeong Mun authored
In order to use a common VSC SDP Colorimetry calculating code on PSR, it adds a compute routine for PSR VSC SDP. As PSR routine can not use infoframes.vsc of crtc state, it also adds new writing of DP SDPs (Secondary Data Packet) for PSR. PSR routine has its own scenario and timings of writing a VSC SDP. v3: Replace a structure name to drm_dp_vsc_sdp from intel_dp_vsc_sdp v4: Use struct drm_device logging macros v10: 1) Fix packing of VSC SDP where Pixel Encoding/Colorimetry Format is not supported. 2) Change a checking of PSR state. Signed-off-by: -
Gwan-gyeong Mun authored
Call intel_dp_set_infoframes(false) function on intel_ddi_post_disable_dp() to make sure not to send VSC SDP and HDR Metadata Infoframe SDP. v5: Polish commit message [Uma] Signed-off-by:
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Gwan-gyeong Mun authored
Call intel_dp_set_infoframes() function on pipe updates to make sure that we send VSC SDP and HDR Metadata Infoframe SDP (when applicable) on fastsets. Signed-off-by:
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Gwan-gyeong Mun authored
Compared to implementation of DP and HDMI's encoder->infoframes_enabled, the lspcon's implementation returns its active state. (we expect enabled infoframe states of HW.) It leads to pipe state mismatch error when ddi_get_config is called. Because the current implementation of lspcon is not ready to support readout infoframes, we need to return 0 here. In order to support readout to lspcon, we need to implement read_infoframe and infoframes_enabled. And set_infoframes also have to set an appropriate bit on crtc_state->infoframes.enable Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
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Gwan-gyeong Mun authored
Added state readout for DP VSC SDP and enabled state validation for DP VSC SDP. v2: Minor style fix v3: Replace a structure name to drm_dp_vsc_sdp from intel_dp_vsc_sdp v4: Use struct drm_device logging macros v10: Skip checking of VSC SDP when a crtc config has psr. Signed-off-by:
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Gwan-gyeong Mun authored
Added state readout for DP HDR Metadata Infoframe SDP. v9: Rebased v10: Rebased Signed-off-by:
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Gwan-gyeong Mun authored
In order to use computed config for DP SDPs (DP VSC SDP and DP HDR Metadata Infoframe SDP), it replaces intel_dp_vsc_enable() function and intel_dp_hdr_metadata_enable() function to intel_dp_set_infoframes() function. And it removes unused functions. Before: intel_dp_vsc_enable() and intel_dp_hdr_metadata_enable() compute sdp configs and program sdp registers on enable callback of encoder. After: It separates computing of sdp configs and programming of sdp register. The compute config callback of encoder calls computing sdp configs. The enable callback of encoder calls programming sdp register. v3: Rebased v5: Polish commit message [Uma] v10: Rebased Signed-off-by:
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Gwan-gyeong Mun authored
Dump out the DP VSC SDP in the normal crtc state dump v3: Replace a structure name to drm_dp_vsc_sdp from intel_dp_vsc_sdp Use drm core's DP VSC SDP logging function Signed-off-by: -
Gwan-gyeong Mun authored
Dump out the DP HDR Metadata Infoframe SDP in the normal crtc state dump. HDMI Dynamic Range and Mastering (DRM) infoframe and DP HDR Metadata Infoframe SDP use the same member variable in infoframes of crtc state. Signed-off-by:
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Gwan-gyeong Mun authored
Dump out the HDMI Dynamic Range and Mastering (DRM) infoframe in the normal crtc state dump. Signed-off-by:
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Gwan-gyeong Mun authored
When receiving video it is very useful to be able to log DP VSC SDP. This greatly simplifies debugging. v2: Minor style fix v3: Move logging functions to drm core [Jani N] v5: Rebased v10: Rebased Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
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Gwan-gyeong Mun authored
It adds code to read the DP SDPs from the video DIP and unpack them into the crtc state. It adds routines that read out DP VSC SDP and DP HDR Metadata Infoframe SDP In order to unpack DP VSC SDP, it adds intel_dp_vsc_sdp_unpack() function. It follows DP 1.4a spec. [Table 2-116: VSC SDP Header Bytes] and [Table 2-117: VSC SDP Payload for DB16 through DB18] In order to unpack DP HDR Metadata Infoframe SDP, it adds intel_dp_hdr_metadata_infoframe_sdp_unpack(). And it follows DP 1.4a spec. ([Table 2-125: INFOFRAME SDP v1.2 Header Bytes] and [Table 2-126: INFOFRAME SDP v1.2 Payload Data Bytes - DB0 through DB31]) and CTA-861-G spec. [Table-42 Dynamic Range and Mastering InfoFrame]. A naming rule and style of intel_read_dp_sdp() function references intel_read_infoframe() function of intel_hdmi.c v2: Minor style fix v3: Replace a structure name to drm_dp_vsc_sdp from intel_dp_vsc_sdp v4: Use struct drm_device logging macros v5: Addressed review comments from Uma - Polish commit message and comments - Combine the if checks of sdp.HB2 and sdp.HB3 - Add 6bpc to unpacking of VSC SDP Signed-off-by:
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Gwan-gyeong Mun authored
It adds an unpack only function for DRM infoframe for dynamic range and mastering infoframe readout. It unpacks the information data block contained in the binary buffer into a structured frame of the HDMI Dynamic Range and Mastering (DRM) information frame. In contrast to hdmi_drm_infoframe_unpack() function, it does not verify a checksum. It can be used for unpacking a DP HDR Metadata Infoframe SDP case. DP HDR Metadata Infoframe SDP uses the same Dynamic Range and Mastering (DRM) information (CTA-861-G spec.) such as HDMI DRM infoframe. But DP SDP header and payload structure are different from HDMI DRM Infoframe. Therefore unpacking DRM infoframe for DP requires skipping of a verifying checksum. v9: Add clear comments to hdmi_drm_infoframe_unpack_only() and hdmi_drm_infoframe_unpack() (Laurent Pinchart) Signed-off-by: -
Chris Wilson authored
The second try at staging the transfer of the breadcrumb. In part one, we realised we could not simply move to the second engine as we were only holding the breadcrumb lock on the first. So in commit 6c81e21a ("drm/i915/gt: Stage the transfer of the virtual breadcrumb"), we removed it from the first engine and marked up this request to reattach the signaling on the new engine. However, this failed to take into account that we only attach the breadcrumb if the new request is added at the start of the queue, which if we are transferring, it is because we know there to be a request to be signaled (and hence we would not be attached). In this attempt, we try to transfer the completed requests to the irq_worker on its rq->engine->breadcrumbs. This preserves the coupling between the rq and its breadcrumbs, so that i915_request_cancel_breadcrumb() does not attempt to manipulate the list under the wrong lock. v2: Code sharing is fun. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1862 Fixes: 6c81e21a ("drm/i915/gt: Stage the transfer of the virtual breadcrumb") Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200513074809.18194-1-chris@chris-wilson.co.uk
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Chris Wilson authored
While this does not appear to fix any issues, the backend itself knows when it wants to emit a breadcrumb, so let it make the final call. Signed-off-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200513074809.18194-16-chris@chris-wilson.co.uk
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Chris Wilson authored
By providing the default values configured into the kernel via sysfs, it is much more convenient for userspace to restore those sane defaults, or at least know what are considered good baseline. This is useful, for example, to cleanup after any failed userspace prior to commencing new jobs. /sys/class/drm/card0/engine/rcs0/ ├── capabilities ├── class ├── .defaults │ ├── heartbeat_interval_ms │ ├── max_busywait_duration_ns │ ├── preempt_timeout_ms │ ├── stop_timeout_ms │ └── timeslice_duration_ms ├── heartbeat_interval_ms ├── instance ├── known_capabilities ├── max_busywait_duration_ns ├── mmio_base ├── name ├── preempt_timeout_ms ├── stop_timeout_ms └── timeslice_duration_ms Signed-off-by:
Maciej Patelczyk <maciej.patelczyk@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200514062905.28668-1-chris@chris-wilson.co.uk
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Chris Wilson authored
Now that we have fast timeslicing on semaphores, we no longer need to prioritise none-semaphore work as we will yield any work blocked on a semaphore to the next in the queue. Previously with no timeslicing, blocking on the semaphore caused extremely bad scheduling with multiple clients utilising multiple rings. Now, there is no impact and we can remove the complication. Signed-off-by:
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- 13 May, 2020 9 commits
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Chris Wilson authored
These were used to set various timeouts for the reset procedure (deciding when the engine was dead, and even if the reset itself was not making forward progress). No longer used. Signed-off-by:
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Chris Wilson authored
The initial-breadcrumb is used to mark the end of the awaiting and the beginning of the user payload. We verify that we do not start the user payload before all signaler are completed, checking our semaphore setup by looking for the initial breadcrumb being written too early. We also want to ensure that we do not add semaphore waits after we have already closed the semaphore section, an issue for later deferred waits. Signed-off-by:
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Chris Wilson authored
Since there can only be one of in_fence/exec_fence, just use the single in_fence local. v2: Consolidate lookup Signed-off-by:
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Nathan Chancellor authored
When building with clang: drivers/gpu/drm/i915/gt/gen8_ppgtt.c:392:24: warning: duplicate 'inline' declaration specifier [-Wduplicate-decl-specifier] declaration specifier [-Wduplicate-decl-specifier] static __always_inline inline void ^ include/linux/compiler_types.h:138:16: note: expanded from macro 'inline' #define inline inline __gnu_inline __inline_maybe_unused notrace ^ 1 warning generated. __always_inline is defined as 'inline __attribute__((__always_inline))' so we do not need to specify it twice. Fixes: 84eac0c6 ("drm/i915/gt: Force pte cacheline to main memory") Link: https://github.com/ClangBuiltLinux/linux/issues/1024Reported-by:Nathan Chancellor <natechancellor@gmail.com> Reviewed-by:
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Chris Wilson authored
It is possible for a residual tasklet to be pending execution as we resume (whether that's some prior test kicking off the tasklet, or if we are in a suspend/resume stress test). As such, we do not want that tasklet to execute in the middle of our sanitization, such that it sees the poisoned state. For example, <4>[ 449.386553] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI <4>[ 449.386555] CPU: 1 PID: 5115 Comm: i915_selftest Tainted: G U W 5.7.0-rc4-CI-CI_DRM_8472+ #1 <4>[ 449.386556] Hardware name: Intel Corporation Ice Lake Client Platform/IceLake U DDR4 SODIMM PD RVP TLC, BIOS ICLSFWR1.R00.3183.A00.1905020411 05/02/2019 <4>[ 449.386585] RIP: 0010:process_csb+0x6bf/0x830 [i915] <4>[ 449.386588] Code: 00 48 c7 c2 10 bc 4c a0 48 c7 c7 d4 75 34 a0 e8 87 0e e6 e0 bf 01 00 00 00 e8 9d e0 e5 e0 31 f6 bf 09 00 00 00 e8 e1 ba d6 e0 <0f> 0b 8b 87 10 05 00 00 85 c0 0f 85 5f f9 ff ff 48 c7 c1 70 a5 4f <4>[ 449.386591] RSP: 0018:ffffc90000170ea0 EFLAGS: 00010297 <4>[ 449.386594] RAX: 0000000080000101 RBX: 0000000000000000 RCX: 0000000000000000 <4>[ 449.386596] RDX: ffff88849d5bc040 RSI: 0000000000000000 RDI: 0000000000000009 <4>[ 449.386598] RBP: ffffc90000170f00 R08: 0000000000000000 R09: 0000000000000000 <4>[ 449.386600] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88843ccea018 <4>[ 449.386602] R13: ffff88843ccea658 R14: ffff88843ccea640 R15: ffff88843ccea000 <4>[ 449.386605] FS: 00007f826a813300(0000) GS:ffff88849fe80000(0000) knlGS:0000000000000000 <4>[ 449.386607] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 449.386609] CR2: 0000560366b94280 CR3: 000000048ba02002 CR4: 0000000000760ee0 <4>[ 449.386611] PKRU: 55555554 <4>[ 449.386613] Call Trace: <4>[ 449.386616] <IRQ> <4>[ 449.386646] ? execlists_submission_tasklet+0xcf/0x140 [i915] <4>[ 449.386674] execlists_submission_tasklet+0x2f/0x140 [i915] <4>[ 449.386679] tasklet_action_common.isra.16+0x6c/0x1c0 <4>[ 449.386684] __do_softirq+0xdf/0x49e <4>[ 449.386687] irq_exit+0xba/0xc0 <4>[ 449.386690] smp_apic_timer_interrupt+0xb7/0x280 <4>[ 449.386693] apic_timer_interrupt+0xf/0x20 <4>[ 449.386695] </IRQ> <4>[ 449.386698] RIP: 0010:_raw_spin_unlock_irqrestore+0x49/0x60 <4>[ 449.386701] Code: c7 02 75 1f 53 9d e8 26 ab 75 ff bf 01 00 00 00 e8 7c a3 69 ff 65 8b 05 7d 9b 5c 7e 85 c0 74 0c 5b 5d c3 e8 09 aa 75 ff 53 9d <eb> df e8 ca 39 5b ff 5b 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 <4>[ 449.386703] RSP: 0018:ffffc90000a6b950 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 <4>[ 449.386706] RAX: 0000000080000001 RBX: 0000000000000202 RCX: 0000000000000000 <4>[ 449.386708] RDX: ffff88849d5bc040 RSI: ffff88849d5bc900 RDI: ffffffff82386f12 <4>[ 449.386710] RBP: ffff88847d400f00 R08: ffff88849d5bc900 R09: 0000000000000000 <4>[ 449.386712] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffff0b0b <4>[ 449.386714] R13: 000000000000000c R14: ffff88847d40bf70 R15: ffff88847d40cef8 <4>[ 449.386742] reset_csb_pointers+0x59/0x140 [i915] <4>[ 449.386769] execlists_sanitize+0x3e/0x60 [i915] <4>[ 449.386797] gt_sanitize+0xd6/0x260 [i915] As part of the reset preparation, engine->reset.prepare() prevents the tasklet from running, so pull the sanitization inside the critical section for reset. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1812 Fixes: 23122a4d ("drm/i915/gt: Scrub execlists state on resume") Signed-off-by:
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Stanislav Lisovskiy authored
Seems that only skl needs to have SAGV turned off for multipipe scenarios, so lets do it this way. If anything blows up - we can always revert this patch. v2: Changed if condition to look better (Ville). Signed-off-by:
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Stanislav Lisovskiy authored
Introduce platform dependent SAGV checking in combination with bandwidth state pipe SAGV mask. This is preparation to adding TGL support, which requires different way of SAGV checking. v2, v3, v4, v5, v6: Fix rebase conflict v7: - Nuke icl specific function, use skl for icl as well, gen specific active_pipes check to be added in the next patch(Ville) v8: - Use more generic intel_crtc_can_enable_sagv for checking(Ville) Signed-off-by: -
Stanislav Lisovskiy authored
For future Gen12 SAGV implementation we need to seemlessly alter wm levels calculated, depending on whether we are allowed to enable SAGV or not. So this accessor will give additional flexibility to do that. Currently this accessor is still simply working as "pass-through" function. This will be changed in next coming patches from this series. v2: - plane_id -> plane->id(Ville Syrjälä) - Moved wm_level var to have more local scope (Ville Syrjälä) - Renamed yuv to color_plane(Ville Syrjälä) in skl_plane_wm_level v3: - plane->id -> plane_id(this time for real, Ville Syrjälä) - Changed colorplane id type from boolean to int as index (Ville Syrjälä) - Moved crtc_state param so that it is first now (Ville Syrjälä) - Moved wm_level declaration to tigher scope in skl_write_plane_wm(Ville Syrjälä) v4: - Started to use enum values for color plane - Do sizeof for a type what we are memset'ing - Zero out wm_uv as well(Ville Syrjälä) v5: - Fixed rebase conflict caused by COLOR_PLANE_* enum removal v6: - Do not use skl_plane_wm_level accessor in skl_allocate_pipe_ddb v7: - Get rid of wm_uv, which is not used in skl_plane_write_wm(Ville) Signed-off-by: -
Chris Wilson authored
Upon gt resume, we first poison then sanitize the engine. However, our testing shows that gen9 will very rarely retain the poisoned value from the HWSP mappings of the execlists status registers. This suggests that it is reading back from the HWSP, so rejig the register reset. v2: Maybe RING_CONTEXT_STATUS_PTR is write masked. It is. References: https://gitlab.freedesktop.org/drm/intel/-/issues/1812Signed-off-by:
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- 12 May, 2020 2 commits
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Swathi Dhanavanthri authored
This w/a is fixed in B0 stepping and needs to be restricted for A0 stepping only. Bspec: 33451 Signed-off-by:
Swathi Dhanavanthri <swathi.dhanavanthri@intel.com> Reviewed-by:
José Roberto de Souza <jose.souza@intel.com> Signed-off-by:
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Chris Wilson authored
i915_gem_evict_something() is charged with finding a slot within the GTT that we may reuse. Since our goal is not to stall, we first look for a slot that only overlaps idle vma. To this end, on the first pass we move any active vma to the end of the search list. However, we only stopped moving active vma after we see the first active vma twice. If during the search, that first active vma completed, we would not notice and keep on extending the search list. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1746 Fixes: 2850748e ("drm/i915: Pull i915_vma_pin under the vm->mutex") Fixes: b1e3177b ("drm/i915: Coordinate i915_active with its own mutex") Signed-off-by:
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- 11 May, 2020 9 commits
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Chris Wilson authored
This reverts commit 0b718ba1. There are still some residual issues with asynchronous binding and execution, but since commit 92581f9f ("drm/i915: Immediately execute the fenced work") we prefer not to use asynchronous binds, and the remaining issues do not seem restricted to Cherryview [at least the ones seen over a few dozen CI runs, less frequent issues are sure to be discovered!] These issues seem to be mitigated, if not eliminated entirely, by the previous commit 84eac0c6 ("drm/i915/gt: Force pte cacheline to main memory"). Signed-off-by:
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Mika Kuoppala authored
We have problems of tgl not seeing a valid pte entry when iommu is enabled. Add heavy handed flushing of entry modification by flushing the cpu, cacheline and then wcb. This forces the pte out to main memory past this point regarless of promises of coherency. This is an evolution of an experimental patch from Chris Wilson of adding wmb for coherent partners, by adding a clflush to force the cache->memory step. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1840 Testcase: igt/gem_exec_fence/parallel Signed-off-by:
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Pascal Terjan authored
It has been unused since commit ccb2acea ("drm/i915: use vfuncs for reg_read/write_fw_domains"). Signed-off-by:
Pascal Terjan <pterjan@google.com> Reviewed-by:
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Chris Wilson authored
Be consistent, and even when we know we had used a WC, flush the mapped object after writing into it. The flush understands the mapping type and will only clflush if !I915_MAP_WC, but will always insert a wmb [sfence] so that we can be sure that all writes are visible. v2: Add the unconditional wmb so we are know that we always flush the writes to memory/HW at that point. Signed-off-by:
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Chris Wilson authored
Be consistent and ensure that we always emit the asynchronous waits prior to issuing instructions that use the address. This ensures that if we do emit GPU commands to do the await, they are before our use! Reviewed-by:
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Ville Syrjälä authored
Get rid of several platform specific variants of intel_digital_port_connected() and just use the ISR bits we've stashed away. v2: Duplicate stuff to avoid exposing platform specific functions across files (Jani) Signed-off-by:Imre Deak <imre.deak@intel.com>
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Ville Syrjälä authored
Instead of constnantly having to figure out which hpd status bit array to use let's store them under dev_priv. Should perhaps take this further and stash even more stuff to make the hpd handling more abstract yet. v2: Remeber cnp (Imre) Add MISSING_CASE() for unknown PCHs (Imre) Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: -
Ville Syrjälä authored
Let's get rid of the platform if ladders in intel_digital_port_connected() and make it a vfunc. Now the if ladders are at the encoder initialization which makes them a bit less convoluted. v2: Add forward decl for intel_encoder in intel_tc.h v3: Duplicate stuff to avoid exposing platform specific functions across files (Jani) Signed-off-by: -
Ville Syrjälä authored
GLK wants the +1 adjustement for the "blocks per line" value for x-tile/y-tile, just like cnl+. Also the x-tile and linear cases are almost identical. The only difference is this +1 which is always done for glk+, and only done for linear on skl/bxt. Let's unify it to a single branch with a special case for the +1, just like we do for y-tile. Signed-off-by:
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