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f69a02c9d5
linux/drivers/gpu/drm/i915
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Chris Wilson f69a02c9d5 drm/i915: Spin after waking up for an interrupt 
When waiting for an interrupt (waiting for the engine to complete some
work), we know we are the only waiter to be woken on this engine. We also
know when the GPU has nearly completed our request (or at least started
processing it), so after being woken and we detect that the GPU is
active and working on our request, allow us the bottom-half (the first
waiter who wakes up to handle checking the seqno after the interrupt) to
spin for a very short while to reduce client latencies.

The impact is minimal, there was an improvement to the realtime-vs-many
clients case, but exporting the function proves useful later. However,
it is tempting to adjust irq_seqno_barrier to include the spin. The
problem is first ensuring that the "start-of-request" seqno is coherent
as we use that as our basis for judging when it is ok to spin. If we
could, spinning there could dramatically shorten some sleeps, and allow
us to make the barriers more conservative to handle missed seqno writes
on more platforms (all gen7+ are known to have the occasional issue, at
least).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1467390209-3576-7-git-send-email-chris@chris-wilson.co.uk
2016-07-01 20:58:47 +01:00
..
gvt drm/i915: gvt: Introduce the basic architecture of GVT-g 2016-06-17 20:35:06 +01:00
dvo_ch7xxx.c
dvo_ch7017.c
dvo_ivch.c
dvo_ns2501.c
dvo_sil164.c
dvo_tfp410.c
dvo.h
i915_cmd_parser.c drm/i915: Fix a buch of kerneldoc warnings 2016-06-06 13:04:26 +01:00
i915_debugfs.c drm/i915: Spin after waking up for an interrupt 2016-07-01 20:58:47 +01:00
i915_drv.c drm/i915: Remove the dedicated hangcheck workqueue 2016-07-01 20:42:29 +01:00
i915_drv.h drm/i915: Spin after waking up for an interrupt 2016-07-01 20:58:47 +01:00
i915_gem_batch_pool.c drm/i915: Propagate error from drm_gem_object_init() 2016-04-28 12:28:58 +03:00
i915_gem_batch_pool.h
i915_gem_context.c drm/i915: Mark all default contexts as uninitialised after context loss 2016-06-24 15:02:55 +01:00
i915_gem_debug.c drm/i915: replace for_each_engine() 2016-03-24 14:34:11 +00:00
i915_gem_dmabuf.c Linux 4.6-rc3 2016-04-11 19:25:13 +02:00
i915_gem_dmabuf.h drm/i915: Serialise presentation with imported dmabufs 2016-06-17 10:32:26 +01:00
i915_gem_evict.c drm/i915: Only switch to default context when evicting from GGTT 2016-06-24 15:03:32 +01:00
i915_gem_execbuffer.c drm: Extract drm_is_current_master 2016-06-21 21:58:12 +02:00
i915_gem_fence.c drm/i915: Introduce & use new lightweight SGL iterators 2016-05-20 13:43:00 +01:00
i915_gem_gtt.c drm/i915: tweak gen6_for_{each_pde, all_pdes} macros 2016-06-27 13:13:53 +01:00
i915_gem_gtt.h drm/i915: tweak gen6_for_{each_pde, all_pdes} macros 2016-06-27 13:13:53 +01:00
i915_gem_render_state.c drm/i915:bxt: Enable Pooled EU support 2016-06-14 10:42:35 +01:00
i915_gem_render_state.h drm/i915: Rename intel_engine_cs function parameters 2016-03-16 15:33:10 +00:00
i915_gem_shrinker.c drm/i915/shrinker: Flush active on objects before counting 2016-07-01 20:42:27 +01:00
i915_gem_stolen.c drm/i915/kbl: Add WaSkipStolenMemoryFirstPage for A0 2016-06-08 16:20:23 +03:00
i915_gem_tiling.c Merge branch 'drm-intel-next' of git://anongit.freedesktop.org/drm-intel into drm-next 2016-06-02 07:58:36 +10:00
i915_gem_userptr.c drm/i915: Introduce & use new lightweight SGL iterators 2016-05-20 13:43:00 +01:00
i915_gem.c drm/i915: Spin after waking up for an interrupt 2016-07-01 20:58:47 +01:00
i915_gem.h drm/i915: Add GEM debugging Kconfig option 2016-04-14 10:45:40 +01:00
i915_gpu_error.c drm/i915: Slaughter the thundering i915_wait_request herd 2016-07-01 20:58:43 +01:00
i915_guc_reg.h drm/i915/bxt: reserve space for RC6 in the the GuC WOPCM 2016-05-18 12:49:19 +01:00
i915_guc_submission.c drm/i915/guc: Remove one unnecessary variable 2016-06-21 15:43:32 +01:00
i915_ioc32.c
i915_irq.c drm/i915: Slaughter the thundering i915_wait_request herd 2016-07-01 20:58:43 +01:00
i915_params.c drm/i915: Set the access right of kernel param "i915.enable_gvt" to read-only. 2016-06-21 11:45:27 +01:00
i915_params.h drm/i915: gvt: Introduce the basic architecture of GVT-g 2016-06-17 20:35:06 +01:00
i915_pci.c drm/i915/bxt: Remove the preliminary_hw_support flag 2016-07-01 21:25:54 +03:00
i915_pvinfo.h drm/i915: Use offsetof() to calculate the offset of members in PVINFO page 2016-06-17 19:44:25 +01:00
i915_reg.h drm/i915/bxt: Fix sanity check for BIOS RC6 setup 2016-07-01 14:57:20 +03:00
i915_suspend.c drm/i915/bxt: Don't save/restore eDP panel power during suspend (v3) 2016-02-08 11:32:32 +02:00
i915_sysfs.c drm/i915: No need to wait for idle on L3 remap 2016-06-24 15:03:06 +01:00
i915_trace_points.c
i915_trace.h drm/i915: Rename struct intel_context 2016-05-24 15:27:14 +01:00
i915_vgpu.c drm/i915: Fold vGPU active check into inner functions 2016-06-17 19:44:29 +01:00
i915_vgpu.h drm/i915: Fold vGPU active check into inner functions 2016-06-17 19:44:29 +01:00
intel_acpi.c
intel_atomic_plane.c drm/i915: Revert async unpin and nonblocking atomic commit 2016-06-01 09:46:46 +02:00
intel_atomic.c drm: Consolidate plane arrays in drm_atomic_state 2016-06-02 17:20:25 +02:00
intel_audio.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-05-23 11:48:48 -07:00
intel_bios.c drm/i915: Check VBT for port presence in addition to the strap on VLV/CHV 2016-06-07 18:45:43 +03:00
intel_bios.h drm/i915: Parse LFP brightness control field in VBT 2016-05-02 16:17:38 +03:00
intel_breadcrumbs.c drm/i915: Slaughter the thundering i915_wait_request herd 2016-07-01 20:58:43 +01:00
intel_color.c drm: drm_helper_crtc_enable_color_mgmt() => drm_crtc_enable_color_mgmt() 2016-06-07 17:10:49 +03:00
intel_crt.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:02 +01:00
intel_csr.c drm/i915/dmc: Step away from symbolic links 2016-06-27 14:26:16 -07:00
intel_ddi.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:03 +01:00
intel_display.c drm/i915: Spin after waking up for an interrupt 2016-07-01 20:58:47 +01:00
intel_dp_aux_backlight.c drm/i915: Add Backlight Control using DPCD for eDP connectors (v9) 2016-04-26 15:17:54 +03:00
intel_dp_link_training.c drm/i915: Revert DisplayPort fast link training feature 2016-06-20 12:37:07 +03:00
intel_dp_mst.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:15 +01:00
intel_dp.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:14 +01:00
intel_dpio_phy.c drm/i915: Move VLV HDMI lane reset work around logic to intel_dpio_phy.c 2016-04-29 09:59:00 +03:00
intel_dpll_mgr.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:16 +01:00
intel_dpll_mgr.h drm/i915: Use a crtc mask instead of a refcount for dpll functions, v2. 2016-03-17 09:27:28 +01:00
intel_drv.h drm/i915: Use atomic waits for short non-atomic ones 2016-06-29 15:53:15 +01:00
intel_dsi_dcs_backlight.c drm/i915/dsi: CABC support for Panel PWM backlight control 2016-05-17 16:12:39 +03:00
intel_dsi_panel_vbt.c drm/i915/dsi: add support for gpio elements on CHV 2016-04-27 09:48:17 +03:00
intel_dsi_pll.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:20 +01:00
intel_dsi.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:19 +01:00
intel_dsi.h drm/i915/dsi: CABC support for Panel PWM backlight control 2016-05-17 16:12:39 +03:00
intel_dvo.c drm/i915: Move connector registration to driver registration 2016-06-24 14:43:26 +01:00
intel_fbc.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:21 +01:00
intel_fbdev.c drm/i915/fbdev: Flush mode configuration before lastclose 2016-06-21 09:36:56 +01:00
intel_fifo_underrun.c drm/i915: Do not use {HAS_*, IS_*, INTEL_INFO}(dev_priv->dev) 2016-04-07 14:50:26 +03:00
intel_frontbuffer.c
intel_guc_fwif.h drm/i915/guc: rework guc_add_workqueue_item() 2016-05-23 14:21:53 +01:00
intel_guc_loader.c drm/i915/guc: don't ever forward VBlank to the GuC 2016-06-27 13:21:59 +01:00
intel_guc.h drm/i915/guc: index host arrays by i915 engine ID, not guc_id 2016-06-21 11:24:25 +01:00
intel_gvt.c drm/i915/gvt: Mark i915.enable_gvt as false if loading fails 2016-06-21 12:40:13 +01:00
intel_gvt.h drm/i915: gvt: Introduce the basic architecture of GVT-g 2016-06-17 20:35:06 +01:00
intel_hdmi.c drm/i915: Move connector registration to driver registration 2016-06-24 14:43:26 +01:00
intel_hotplug.c drm/i915: Small display interrupt handlers tidy 2016-05-09 13:38:16 +01:00
intel_i2c.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:22 +01:00
intel_lrc.c drm/i915: Slaughter the thundering i915_wait_request herd 2016-07-01 20:58:43 +01:00
intel_lrc.h drm/i915: Introduce execlist context status change notification 2016-06-17 20:36:19 +01:00
intel_lvds.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:23 +01:00
intel_mocs.c drm/i915/mocs: || vs | typo in get_mocs_settings() 2016-06-13 17:38:01 +03:00
intel_mocs.h drm/i915/mocs: Program MOCS for all engines on init 2016-04-14 10:45:40 +01:00
intel_modes.c
intel_opregion.c drm/i915/opregion: handle missing connector types for acpi display types 2016-06-29 17:41:50 +03:00
intel_overlay.c Merge branch 'drm-intel-next' of git://anongit.freedesktop.org/drm-intel into drm-next 2016-06-02 07:58:36 +10:00
intel_panel.c drm/i915: Move backlight registration to connector registration 2016-06-24 14:43:14 +01:00
intel_pm.c drm/i915: Spin after waking up for an interrupt 2016-07-01 20:58:47 +01:00
intel_psr.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:25 +01:00
intel_renderstate_gen6.c
intel_renderstate_gen7.c
intel_renderstate_gen8.c
intel_renderstate_gen9.c
intel_renderstate.h
intel_ringbuffer.c drm/i915: Slaughter the thundering i915_wait_request herd 2016-07-01 20:58:43 +01:00
intel_ringbuffer.h drm/i915: Slaughter the thundering i915_wait_request herd 2016-07-01 20:58:43 +01:00
intel_runtime_pm.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 17:05:41 +01:00
intel_sdvo_regs.h
intel_sdvo.c drm/i915: Move connector registration to driver registration 2016-06-24 14:43:26 +01:00
intel_sideband.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 15:42:33 +01:00
intel_sprite.c drm/i915: Signal drm events for atomic 2016-06-16 14:28:34 +02:00
intel_tv.c drm/i915: Move connector registration to driver registration 2016-06-24 14:43:26 +01:00
intel_uncore.c drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register() 2016-06-30 17:05:07 +01:00
intel_vbt_defs.h drm/i915: Extract physical display dimensions from VBT 2016-06-02 14:33:09 +03:00
Kconfig drm/i915: gvt: Introduce the basic architecture of GVT-g 2016-06-17 20:35:06 +01:00
Kconfig.debug drm/i915/debug: Select PREEMPT_COUNT when enabling debugging 2016-06-29 15:53:14 +01:00
Makefile drm/i915: Slaughter the thundering i915_wait_request herd 2016-07-01 20:58:43 +01:00