drm/i915: Put all non-blocking modesets onto an ordered wq

We have plenty of global registers and whatnot programmed without
any further locking by the modeset code. Currently non-bocking
modesets are allowed to execute in parallel which could corrupt
said registers.

To avoid the problem let's run all non-blocking modesets on an
ordered workqueue. We still put page flips etc. to system_unbound_wq
allowing page flips on one pipe to execute in parallel with page flips
or a modeset on a another pipe (assuming no known state is shared
between them, at which point they would have been added to the same
atomic commit and serialized that way).

Blocking modesets are already serialized with each other by
connection_mutex, and thus are safe. To serialize them with
non-blocking modesets we just flush the workqueue before executing
blocking modesets.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: 94f050246b42 ("drm/i915: nonblocking commit")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171113133622.8593-1-ville.syrjala@linux.intel.com
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

drm/i915: Disable GMBUS clock gating around GMBUS transfers on gen9+

Gen9+ need to disable GMBUS clock gating when doing multi part
transfers. Otherwise clock gating will kick in when GMBUS is in
the WAIT state and presumably that will corrupt the transfer.
This is documented as Display WA #0868.

Apparently older hardware doesn't allow clock gating in the WAIT
state and thus are unaffected by this problem.

v2: Limit the PCH w/a to gen9 and gen10 only (DK)
    Actually change it to check the PCH type instead since
    it's the PCH that actually contains the GMBUS hardware

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20171221202432.17373-1-ville.syrjala@linux.intel.com

drm/i915: Clean up the PNV bit banging vs. GMBUS clock gating w/a

Give a proper name for the GMBUS clock gating disable bit on PNV,
and rename intel_i2c_quirk_set() to pnv_gmbus_clock_gating() for
clarity.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208213739.16388-3-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915: No need to power up PG2 for GMBUS on BXT

GMBUS lives in PG1, so no need to power up PG2. We do want to prevent
the DMC from making a mess of things though, so add GMBUS to the DC off
power well.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208213739.16388-2-ville.syrjala@linux.intel.com
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

drm/i915: Disable DC states around GMBUS on GLK

Prevent the DMC from destroying GMBUS transfers on GLK. GMBUS
lives in PG1 so DC off is all we need.

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208213739.16388-1-ville.syrjala@linux.intel.com
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

drm/i915: Do not enable movntdqa optimization in hypervisor guest

Our QA reported a problem caused by movntdqa instructions. Currently,
the KVM hypervisor doesn't support VEX-prefix instructions emulation.
If users passthrough a GPU to guest with vfio option 'x-no-mmap=on',
then all access to the BARs will be trapped and emulated. The KVM
hypervisor would raise an inertal error to qemu which cause the guest
killed. (Since 'movntdqa' ins is not supported.)

This patch try not to enable movntdqa optimization if the driver is
running in hypervisor guest.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1513924309-3113-1-git-send-email-changbin.du@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915: Dump device info at once

We are dumping device info separately for sw_only and runtime part
but to simplify the code we can also do it from one place once
we complete driver load.

v2: use dedicated welcome function (Chris)

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221185334.17396-8-michal.wajdeczko@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221215735.30314-7-chris@chris-wilson.co.uk

drm/i915: Add pretty printer for runtime part of intel_device_info

During initialization of the runtime part of the intel_device_info
we are dumping that part using DRM_DEBUG_DRIVER mechanism.
As we already have pretty printer for const part of the info,
make similar function for the runtime part and use it separately.

v2: add runtime dump to debugfs (Chris)

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221185334.17396-7-michal.wajdeczko@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221215735.30314-6-chris@chris-wilson.co.uk

drm/i915: Update intel_device_info_runtime_init() parameter

As we try to follow object-verb pattern in our functions, update
intel_device_info_runtime_init() parameter from dev_priv to info.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221185334.17396-6-michal.wajdeczko@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221215735.30314-5-chris@chris-wilson.co.uk

drm/i915: Move intel_device_info definitions to its own header

We already keep intel_device_info functions in dedicated file.
Add matching header file and move related definitions there.

v2: add gen boundaries (Chris)

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221185334.17396-5-michal.wajdeczko@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221215735.30314-4-chris@chris-wilson.co.uk

drm/i915: Move opregion definitions to dedicated intel_opregion.h

We already have dedicated file for opregion related code, dedicated
header will make our life easier.

v2: reorder includes (Chris)

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221185334.17396-4-michal.wajdeczko@intel.com
[ickle: quieten checkpatch]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221215735.30314-3-chris@chris-wilson.co.uk

drm/i915: Move display related definitions to dedicated header

We already have separate files for display related code, there
is no reason to keep all display definitions in master header.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221185334.17396-3-michal.wajdeczko@intel.com
[ickle: quieten checkpatch]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221215735.30314-2-chris@chris-wilson.co.uk

drm/i915: Move some utility functions to i915_util.h

We have dedicated header file for utility functions and macros.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221185334.17396-2-michal.wajdeczko@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221215735.30314-1-chris@chris-wilson.co.uk

drm/i915: Show FBC worker status in debugfs

Include the pending update from the FBC worker in i915_fbc_status.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171220205848.8510-1-chris@chris-wilson.co.uk
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

drm/i915: Disable all planes for load detection, v2.

We don't need any active planes during load detection, so just disable
them all. This saves us from having to come up with a suitable
framebuffer. And we also avoid leaving sprite/cursor planes on and
potentially presenting them at a peculiar location during the load
detection.

Changes since v1 (Maarten):
- Add missing call to add_all_affected_planes.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102707
Link: https://patchwork.freedesktop.org/patch/msgid/20171220093545.613-4-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

i915: Reject CCS modifiers for pipe C on Geminilake

Current code advertises (on the modifiers blob property) support for CCS
modifier for pipe C on GLK, only to reject it later when validating the
request before the atomic commit.

This fixes the tests igt@kms_ccs@pipe-c-*, which should skip on GLK for
pipe C (see bug 104096).

A relevant discussion is archived at:

https://lists.freedesktop.org/archives/intel-gfx/2017-December/150646.html

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104096
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Cc: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171220002410.5604-1-krisman@collabora.co.uk

drm/i915/cfl: Adding more Coffee Lake PCI IDs.

Spec has been updated with more reserved IDs for existent SKUs.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Anuj Phogat <anuj.phogat@gmail.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa<anusha.srivatsa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171220182919.21108-1-rodrigo.vivi@intel.com

drm/i915: Tidy up GEM_TRACE around execlists

Looking at the coordination of resets with the submission of execlists,
it will be useful to have a GEM_TRACE for when we issue the reset.
Whilst there tidy up the other GEM_TRACE to always include the engine
name, and be careful not to trust any pointers prior to asserts.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171220090626.31643-1-chris@chris-wilson.co.uk

drm/i915/psr: Fix register name mess up.

Commit 77affa31722b ("drm/i915/psr: Fix compiler warnings for
hsw_psr_disable()") swapped status and control registers while fixing
indentation. The _ctl at the end of the status register name must have to
led to this.

Fixes: 77affa31722b ("drm/i915/psr: Fix compiler warnings for hsw_psr_disable()")
References: https://www.mrc-cbu.cam.ac.uk/people/matt.davis/cmabridge/
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171220043520.2599-1-dhinakaran.pandiyan@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915: Avoid context dereference inside execlists_submission_tasklet

A lesson that has to be relearnt over and over again is that the request
does not keep a reference to the context and so we cannot freely
dereference the context from inside the execlists_submission_tasklet. In
particular, we try to do so in the new GEM_TRACE() so convert those over
to the port->context_id we keep for GEM debugging. This means the
tracing now depends on DRM_I915_GEM_DEBUG.

Fixes: bccd3b831185 ("drm/i915: Use trace_printk to provide a death rattle for GEM")
References: https://bugs.freedesktop.org/show_bug.cgi?id=104066
References: https://bugs.freedesktop.org/show_bug.cgi?id=104162
References: https://bugs.freedesktop.org/show_bug.cgi?id=104242
References: https://bugs.freedesktop.org/show_bug.cgi?id=104310
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219220916.30882-1-chris@chris-wilson.co.uk

drm/i915: Remove pointer indirection for hangcheck_state local

Use the local on-stack struct directly rather than hide it behind a
pointer. This should be both clearer for the reader and the compiler (we
rely on the compiler seeing through the functions to spot uninitialized
uses of the local).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219130948.6282-1-chris@chris-wilson.co.uk

drm/i915: Show if we consider the engine is idle in the GPU error state

Useful for verifying our bookkeeper when we encounter is knowing whether
we think the engine is idle at the time of the GPU hang.

References: https://bugs.freedesktop.org/show_bug.cgi?id=104305
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219131419.13117-1-chris@chris-wilson.co.uk

drm/i915: Implement WaDisableEarlyEOT.

There seems to be another clock gating issue which the workaround is
described as:

   "WA: Set 0xE4F0[1] = 1 to disable Early EOT of thread."

Signed-off-by: Rafael Antognolli <rafael.antognolli@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171216001117.14232-2-rafael.antognolli@intel.com

drm/i915: Implement WaDisableVFclkgate.

This workaround supposedly fixes some hangs in the VF unit.

Signed-off-by: Rafael Antognolli <rafael.antognolli@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171216001117.14232-1-rafael.antognolli@intel.com

drm/i915: Add pretty printer for modparams

We dump modparams in few places (debugfs, gpu_error) using different
functions. Lets add reusable function to avoid code duplication.

add/remove: 1/0 grow/shrink: 0/2 up/down: 1096/-2339 (-1243)
Function                                     old     new   delta
i915_params_dump                               -    1096   +1096
i915_capabilities                           1353     185   -1168
i915_error_state_to_str                     5507    4336   -1171
Total: Before=1285716, After=1284473, chg -0.10%

v2: use forward decl rather than include (Chris)

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219114346.26308-3-michal.wajdeczko@intel.com

drm/i915: Convert intel_device_info_dump into pretty printer

Convert intel_device_info_dump into pretty printer to be
consistent with the rest of the driver code.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219114346.26308-2-michal.wajdeczko@intel.com

drm/i915: Add pretty printer for device info flags

We dump device flags in few places (init_early, debugfs, gpu_error)
using different functions. Lets add reusable function to avoid
code duplication.

add/remove: 1/0 grow/shrink: 0/3 up/down: 1296/-3572 (-2276)
Function                                     old     new   delta
intel_device_info_dump_flags                   -    1296   +1296
i915_capabilities                           2435    1353   -1082
i915_error_state_to_str                     6642    5507   -1135
intel_device_info_dump                      1507     152   -1355
Total: Before=1287992, After=1285716, chg -0.18%

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219114346.26308-1-michal.wajdeczko@intel.com

drm/i915: Fix indentation for intel_ddi_clk_select

drivers/gpu/drm/i915/intel_ddi.c:2098 intel_ddi_clk_select() warn: inconsistent indenting

References: 8edcda1266f9 ("drm/i915: Protect DDI port to DPLL map from theoretical race.")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219112649.9388-1-chris@chris-wilson.co.uk

drm/i915: Add a strong mb to resetting the has-CS-interrupt bit

After a reset, the state of the CSB registers are scrubbed and not valid
until a powercontext is reloaded. We only know when a powercontext has
been reloaded once we see a CS-interrupt, before then we must ignore the
CSB registers within the execlists_submission_tasklet. However, glk is
sporadically dying with an illegal CSB pointer value (both in the HSWP
and mmio) suggesting that it is running with the CS-interrupt bit set
before the powercontext has been reloaded. Make sure the clearing of
that bit is serialised on reset with the re-enabling of the tasklet.

References: https://bugs.freedesktop.org/show_bug.cgi?id=104262
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219090110.11153-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

drm/i915/cnl: Add support for horizontal plane flipping

CNL supports horizontal plane flipping on non-linear plane formats.

v2:
- Avoid BUG unlike elsewhere in the code (Ville)
- Hoist the rotation-tiling restriction check (Ville)

v3 (Rodrigo):
- Rebased after a while.
- Fix small indentation issues.

Bspec: 7656
Suggested-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171215213800.7896-1-rodrigo.vivi@intel.com

drm/i915: Protect DDI port to DPLL map from theoretical race.

In case we have multiple modesets for different connectors
happening in parallel we could have a race on the RMW on these
shared registers.

This possibility was initially raised by Paulo when reviewing
commit '555e38d27317 ("drm/i915/cnl: DDI - PLL mapping")'
but the original possibility comes from commit '5416d871136d
("drm/i915/skl: Set the eDP link rate on DPLL0")'. Or maybe
later when atomic commits entered into picture.

Apparently the discussion around this topic showed that the
right solution would be on serializing the atomic commits in
a way that we don't have the possibility of races here since
if that parallel modeset happenings apparently many other
things will be on fire.

Code is there since SKL and there was no report of issue,
but since we never looked back to that serialization possibility,
and also we don't have an igt case for that it is better to at
least protect this corner.

Suggested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Fixes: 555e38d27317 ("drm/i915/cnl: DDI - PLL mapping")
Fixes: 5416d871136d ("drm/i915/skl: Set the eDP link rate on DPLL0")
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com
Link: https://patchwork.freedesktop.org/patch/msgid/20171215224310.19103-1-rodrigo.vivi@intel.com

drm/i915/selftests: Fix up igt_reset_engine

Now that we skip a per-engine reset on an idle engine, we need to update
the selftest to take that into account. In the process, we find that we
were not stressing the per-engine reset very hard, so add those missing
active resets.

v2: Actually test i915_reset_engine() by loading it with requests.

Fixes: f6ba181ada55 ("drm/i915: Skip an engine reset if it recovered before our preparations")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104313
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171217132852.30642-3-chris@chris-wilson.co.uk
Reviewed-by: Michel Thierry <michel.thierry@intel.com>

drm/i915/trace: add hw_id to gem requests trace points

When monitoring the GPU with i915 perf, reports are tagged with a hw
id. Gem context creation tracepoints already have a hw_id field,
unfortunately you only get this correlation between a process id and a
hw context id once when the context is created. It doesn't help if you
started monitoring after the process was initialized or if the drm fd
was transfered from one process to another.

This change adds the hw_id field to gem requests, so that correlation
can also be done on submission.

v2: Place hw_id at the end of the tracepoint to not disrupt too much
    existing tools (Chris)

v3: Reorder hw_id field again (Chris)

v4: Add missing hw_id to i915_gem_request_wait_begin tracepoint (Chris)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171218151959.14073-3-lionel.g.landwerlin@intel.com

drm/i915: reorder field in gem_request tracepoints

Let's make the order of the fields of the tracepoints involving gem
request match across i915. This makes userspace processing of
tracepoint a bit easier.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171218151959.14073-2-lionel.g.landwerlin@intel.com

drm/i915: Show IPEIR and IPEHR in the engine dump

A useful bit of information for inspecting GPU stalls from
intel_engine_dump() are the error registers, IPEIR and IPEHR.

v2: Fixup gen changes in register offsets (Tvrtko)
v3: Old FADDR location as well
v4: Use I915_READ64_2x32

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171218123914.19027-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

drm/i915: prefer i915_gem_object_has_pages()

We have an existing helper for testing obj->mm.pages, so use it.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171218103855.25274-1-matthew.auld@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915: Re-enable GGTT earlier after GPU reset

Inside i915_gem_reset(), we start touching the HW and so require the
low-level HW to be re-enabled, in particular the PCI BARs.

Fixes: 7b6da818d86f ("drm/i915: Restore the kernel context after a GPU reset on an idle engine")
References: 0db8c9612091 ("drm/i915: Re-enable GTT following a device reset")
Testcase: igt/drv_hangman #i915g/i915gm
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171217132852.30642-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

drm/i915: Unifying debugfs return codes for unsupported features

Instead of trying different seq_puts messages, lets use common
-ENODEV error code to indicate missing/unsupported feature.

v2: don't forget about guc_log_control fops (Sagar)

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171215143635.17884-1-michal.wajdeczko@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915: Restore the kernel context after a GPU reset on an idle engine

As part of the system requirement for powersaving is that we always have
a context loaded. Upon boot and resume, we load the kernel_context to
ensure that some valid state is set before powersaving kicks in, we
should do so after a full GPU reset as well. We only need to do so for
an idle engine, as any active engines will restart by executing the
stuck request, loading its context. For the idle engine, we create a
new request to load the kernel_context instead.

For whatever reason, perfoming a dummy execute on the idle engine after
reset papers over a subsequent GPU hang in rare circumstances, even on
machines not using contexts (e.g. Pineview).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104259
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104261
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171216000334.8197-1-chris@chris-wilson.co.uk

drm/i915: Skip an engine reset if it recovered before our preparations

At the beginning of a reset, we disable the submission method and find
the stuck request. We expect to find a stuck request for we have
declared the engine stalled. However, if we find no active request, the
engine must have recovered from its stall before we could issue a reset,
so let the engine continue on without a reset. If the engine is truly
stuck, we will back soon enough with the next reset attempt.

v2: Remove the stale debug message.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171216002206.31737-1-chris@chris-wilson.co.uk

x86/gpu: add CFL to early quirks

CFL was missing from intel_early_ids[]. The PCI ID needs to be there to
allow the memory region to be stolen, otherwise we could have RAM being
arbitrarily overwritten if for example we keep using the UEFI framebuffer,
depending on how BIOS has set up the e820 map.

Fixes: b056f8f3d6b9 ("drm/i915/cfl: Add Coffee Lake PCI IDs for S Skus.")
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
Cc: <stable@vger.kernel.org> # v4.13+ 0890540e21cf drm/i915: add GT number to intel_device_info
Cc: <stable@vger.kernel.org> # v4.13+ 41693fd52373 drm/i915/kbl: Change a KBL pci id to GT2 from GT1.5
Cc: <stable@vger.kernel.org> # v4.13+
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213200425.2954-1-lucas.demarchi@intel.com

drm/i915/lpe: Remove double-encapsulation of info string

Just printk the string, or at least do not double up on the newlines!

Fixes: eef57324d926 ("drm/i915: setup bridge for HDMI LPE audio driver")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Jerome Anand <jerome.anand@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213182858.2159-1-chris@chris-wilson.co.uk

drm/i915: Allow internal page allocations to fail

Internal objects consistent of scratch pages not subject to the
persistence guarantees of user facing objects. They are used for
example, in ring buffers where they are only required for temporary
storage of commands that will be rewritten every time. As they are
temporary constructs, quietly report -ENOMEM back along the callchain
rather than subject the system to oomkiller if an allocation fails.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171215101753.1519-1-chris@chris-wilson.co.uk

drm/i915: Update DRIVER_DATE to 20171214

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Merge tag 'gvt-next-2017-12-14' of https://github.com/intel/gvt-linux into drm-intel-next-queued

gvt-next-2017-12-14:

- fixes for two coverity scan errors (Colin)
- mmio switch code refine (Changbin)
- more virtual display dmabuf fixes (Tina/Gustavo)
- misc cleanups (Pei)

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171214033434.jlppjlyal5d67ya7@zhen-hp.sh.intel.com

drm/i915: properly init lockdep class

The code has an ifdef and uses two functions to either init the bare
spinlock or init it and set a lock-class. It is possible to do the same
thing without an ifdef.
With this patch (in debug case) we first use the "default" lock class
which is later overwritten to the supplied one. Without lockdep the set
name/class function vanishes.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171214131009.7479-1-joonas.lahtinen@linux.intel.com
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drm/i915: Show engine state when hangcheck detects a stall

Knowing the state of the engine when hangcheck thinks it is stalling is
useful for both debugging hangcheck itself and the potential cause of an
unwanted stall.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171214122613.26134-1-chris@chris-wilson.co.uk

drm/i915: make CS frequency read support missing more obvious

As suggested by Chris, we should make this more obvious for people
working with newer generations.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213171154.6201-1-lionel.g.landwerlin@intel.com

drm/i915/guc: Extract doorbell verification into a function

We have the selftest that's checking doorbell create/destroy, so there's
no need to check all doorbells delaying the reset every time.
We do want to have that extra sanity check at module load/unload though.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213221352.7173-7-michal.winiarski@intel.com

drm/i915/guc: Extract clients allocation to submission_init

We can now move the clients allocation to submission_init path, rather
than keeping the condition inside submission_enable called on every
reset.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213221352.7173-6-michal.winiarski@intel.com

drm/i915/guc: Extract doorbell creation from client allocation

Full GPU reset causes GuC to be reset. This means that every time we're
doing a reset, we need to talk to GuC and tell it about doorbells.
Let's separate the communication part (create_doorbell) from our
internal bookkeeping (reserve_doorbell) so that we can cleanly separate
the initialization done at module load from reinitialization done at
reset in the following patch.
While I'm here, let's also add a proper (although slightly asymetric)
cleanup that doesn't try to communicate with GuC after it's already
gone, getting rid of "expected" warnings caused by GuC action failures
on module unload.

Note that I've also removed one of the tests (bitmap out of sync), since
it doesn't make much sense anymore - bitmaps are now not expected to
change during the lifetime of a client.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213221352.7173-5-michal.winiarski@intel.com

drm/i915/guc: Call invalidate after changing the vfunc

To make this operation a bit cleaner, we should make sure that the HW
can catch up by calling the new implementation right away.
Note that currently we're only touching the vfunc at module load time
(before GuC is even loaded), so this shouldn't cause any functional
changes.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213221352.7173-4-michal.winiarski@intel.com

drm/i915/guc: Extract guc_init from guc_init_hw

After GPU reset, GuC HW needs to be reinitialized (with FW reload).
Unfortunately, we're doing some extra work there (mostly allocating stuff),
work that can be moved to guc_init and called once at driver load time.

As a side effect we're no longer hitting an assert in
i915_ggtt_enable_guc on suspend/resume.

v2: Do not duplicate disable_communication / reset_guc_interrupts
v3: Add proper teardown after rebase

References: 04f7b24eccdf ("drm/i915/guc: Assert that we switch between known ggtt->invalidate functions")
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213221352.7173-3-michal.winiarski@intel.com

drm/i915/guc: Move GuC workqueue allocations outside of the mutex

This gets rid of the following lockdep splat:

======================================================
WARNING: possible circular locking dependency detected
4.15.0-rc2-CI-Patchwork_7428+ #1 Not tainted
------------------------------------------------------
debugfs_test/1351 is trying to acquire lock:
 (&dev->struct_mutex){+.+.}, at: [<000000009d90d1a3>] i915_mutex_lock_interruptible+0x47/0x130 [i915]

but task is already holding lock:
 (&mm->mmap_sem){++++}, at: [<000000005df01c1e>] __do_page_fault+0x106/0x560

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #6 (&mm->mmap_sem){++++}:
       __might_fault+0x63/0x90
       _copy_to_user+0x1e/0x70
       filldir+0x8c/0xf0
       dcache_readdir+0xeb/0x160
       iterate_dir+0xe6/0x150
       SyS_getdents+0xa0/0x130
       entry_SYSCALL_64_fastpath+0x1c/0x89

-> #5 (&sb->s_type->i_mutex_key#5){++++}:
       lockref_get+0x9/0x20

-> #4 ((completion)&req.done){+.+.}:
       wait_for_common+0x54/0x210
       devtmpfs_create_node+0x130/0x150
       device_add+0x5ad/0x5e0
       device_create_groups_vargs+0xd4/0xe0
       device_create+0x35/0x40
       msr_device_create+0x22/0x40
       cpuhp_invoke_callback+0xc5/0xbf0
       cpuhp_thread_fun+0x167/0x210
       smpboot_thread_fn+0x17f/0x270
       kthread+0x173/0x1b0
       ret_from_fork+0x24/0x30

-> #3 (cpuhp_state-up){+.+.}:
       cpuhp_issue_call+0x132/0x1c0
       __cpuhp_setup_state_cpuslocked+0x12f/0x2a0
       __cpuhp_setup_state+0x3a/0x50
       page_writeback_init+0x3a/0x5c
       start_kernel+0x393/0x3e2
       secondary_startup_64+0xa5/0xb0

-> #2 (cpuhp_state_mutex){+.+.}:
       __mutex_lock+0x81/0x9b0
       __cpuhp_setup_state_cpuslocked+0x4b/0x2a0
       __cpuhp_setup_state+0x3a/0x50
       page_alloc_init+0x1f/0x26
       start_kernel+0x139/0x3e2
       secondary_startup_64+0xa5/0xb0

-> #1 (cpu_hotplug_lock.rw_sem){++++}:
       cpus_read_lock+0x34/0xa0
       apply_workqueue_attrs+0xd/0x40
       __alloc_workqueue_key+0x2c7/0x4e1
       intel_guc_submission_init+0x10c/0x650 [i915]
       intel_uc_init_hw+0x29e/0x460 [i915]
       i915_gem_init_hw+0xca/0x290 [i915]
       i915_gem_init+0x115/0x3a0 [i915]
       i915_driver_load+0x9a8/0x16c0 [i915]
       i915_pci_probe+0x2e/0x90 [i915]
       pci_device_probe+0x9c/0x120
       driver_probe_device+0x2a3/0x480
       __driver_attach+0xd9/0xe0
       bus_for_each_dev+0x57/0x90
       bus_add_driver+0x168/0x260
       driver_register+0x52/0xc0
       do_one_initcall+0x39/0x150
       do_init_module+0x56/0x1ef
       load_module+0x231c/0x2d70
       SyS_finit_module+0xa5/0xe0
       entry_SYSCALL_64_fastpath+0x1c/0x89

-> #0 (&dev->struct_mutex){+.+.}:
       lock_acquire+0xaf/0x200
       __mutex_lock+0x81/0x9b0
       i915_mutex_lock_interruptible+0x47/0x130 [i915]
       i915_gem_fault+0x201/0x760 [i915]
       __do_fault+0x15/0x70
       __handle_mm_fault+0x85b/0xe40
       handle_mm_fault+0x14f/0x2f0
       __do_page_fault+0x2d1/0x560
       page_fault+0x22/0x30

other info that might help us debug this:

Chain exists of:
  &dev->struct_mutex --> &sb->s_type->i_mutex_key#5 --> &mm->mmap_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&mm->mmap_sem);
                               lock(&sb->s_type->i_mutex_key#5);
                               lock(&mm->mmap_sem);
  lock(&dev->struct_mutex);

 *** DEADLOCK ***

1 lock held by debugfs_test/1351:
 #0:  (&mm->mmap_sem){++++}, at: [<000000005df01c1e>] __do_page_fault+0x106/0x560

stack backtrace:
CPU: 2 PID: 1351 Comm: debugfs_test Not tainted 4.15.0-rc2-CI-Patchwork_7428+ #1
Hardware name:                  /NUC6i5SYB, BIOS SYSKLi35.86A.0057.2017.0119.1758 01/19/2017
Call Trace:
 dump_stack+0x5f/0x86
 print_circular_bug+0x230/0x3b0
 check_prev_add+0x439/0x7b0
 ? lockdep_init_map_crosslock+0x20/0x20
 ? unwind_get_return_address+0x16/0x30
 ? __lock_acquire+0x1385/0x15a0
 __lock_acquire+0x1385/0x15a0
 lock_acquire+0xaf/0x200
 ? i915_mutex_lock_interruptible+0x47/0x130 [i915]
 __mutex_lock+0x81/0x9b0
 ? i915_mutex_lock_interruptible+0x47/0x130 [i915]
 ? i915_mutex_lock_interruptible+0x47/0x130 [i915]
 ? i915_mutex_lock_interruptible+0x47/0x130 [i915]
 i915_mutex_lock_interruptible+0x47/0x130 [i915]
 ? __pm_runtime_resume+0x4f/0x80
 i915_gem_fault+0x201/0x760 [i915]
 __do_fault+0x15/0x70
 __handle_mm_fault+0x85b/0xe40
 handle_mm_fault+0x14f/0x2f0
 __do_page_fault+0x2d1/0x560
 page_fault+0x22/0x30
RIP: 0033:0x7f98d6f49116
RSP: 002b:00007ffd6ffc3278 EFLAGS: 00010283
RAX: 00007f98d39a2bc0 RBX: 0000000000000000 RCX: 0000000000001680
RDX: 0000000000001680 RSI: 00007ffd6ffc3400 RDI: 00007f98d39a2bc0
RBP: 00007ffd6ffc33a0 R08: 0000000000000000 R09: 00000000000005a0
R10: 000055e847c2a830 R11: 0000000000000002 R12: 0000000000000001
R13: 000055e847c1d040 R14: 00007ffd6ffc3400 R15: 00007f98d6752ba0

v2: Init preempt_work unconditionally (Chris)
v3: Mention that we need the enable_guc=1 for lockdep splat (Chris)

Testcase: igt/debugfs_test/read_all_entries # with i915.enable_guc=1
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213221352.7173-2-michal.winiarski@intel.com

drm/i915/guc: Move shared data allocation away from submission path

We need shared data for actions (e.g. guc suspend/resume), and we're
using those with GuC submission disabled.
Let's introduce intel_guc_init and move shared data alloc there.

This fixes GPF during module unload with HuC, but without GuC submission:

BUG: unable to handle kernel NULL pointer dereference at 000000005aee7809
IP: intel_guc_suspend+0x34/0x140 [i915]
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP
Modules linked in: i915(O-) netconsole x86_pkg_temp_thermal
intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
mei_me i2c_i801 mei prime_numbers [last unloaded: i915]
CPU: 2 PID: 2794 Comm: rmmod Tainted: G     U  W  O 4.15.0-rc2+ #297
Hardware name: /NUC6i5SYB, BIOS SYSKLi35.86A.0054.2016.0930.1102 09/30/2016
task: 0000000055945c61 task.stack: 00000000264ccb43
RIP: 0010:intel_guc_suspend+0x34/0x140 [i915]
RSP: 0018:ffffc90000483df8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff880829180000 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffff880844c2c938 RDI: ffff880844c2c000
RBP: ffff880829180000 R08: 00000000a29c58c1 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa040ba40
R13: ffffffffa040bab0 R14: ffff88084a195060 R15: 000055df3ef357a0
FS:  00007ff43c043740(0000) GS:ffff88084e200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000f9 CR3: 000000083f179005 CR4: 00000000003606e0
Call Trace:
 i915_gem_suspend+0x9d/0x130 [i915]
 ? i915_driver_unload+0x68/0x180 [i915]
 i915_driver_unload+0x70/0x180 [i915]
 i915_pci_remove+0x15/0x20 [i915]
 pci_device_remove+0x36/0xb0
 device_release_driver_internal+0x15f/0x220
 driver_detach+0x3a/0x80
 bus_remove_driver+0x58/0xd0
 pci_unregister_driver+0x29/0x90
 SyS_delete_module+0x150/0x1e0
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x7ff43b51b5c7
RSP: 002b:00007ffe6825a758 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007ff43b51b5c7
RDX: 000000000000000a RSI: 0000000000000800 RDI: 000055df3ef35808
RBP: 0000000000000000 R08: 00007ffe682596d1 R09: 0000000000000000
R10: 00007ff43b594880 R11: 0000000000000206 R12: 000055df3ef357a0
R13: 00007ffe68259740 R14: 000055df3ef35260 R15: 000055df3ef357a0
Code: 00 00 02 74 03 31 c0 c3 53 48 89 fb 48 83 ec 10 e8 52 0f
f8 ff 48 b8 01 05 00 00 02 00 00 00 48 89 44 24 04 48 8b 83 00 12 00 00 <f6> 80
f9 00 00 00 01 0f 84 a7 00 00 00 f6 80 98 00 00 00 01 0f
RIP: intel_guc_suspend+0x34/0x140 [i915] RSP: ffffc90000483df8
CR2: 00000000000000f9
---[ end trace 23a192a61d937a3e ]---

Fixes: b8e5eb960b28 ("drm/i915/guc: Allocate separate shared data object for GuC communication")
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213221352.7173-1-michal.winiarski@intel.com

drm/i915: Unwind i915_gem_init() failure

Since Michal introduced new user controllable errors other than -EIO
during i915_gem_init(), we need to actually unwind on the error path as
we have to abort the module load (and we expect to do so cleanly!).

As we now teardown key state and then mark the driver as wedged (on
EIO), we have to be careful to not allow ourselves to resume and
unwedge, thus attempting to use the uninitialised driver.

v2: Try not to free driver state for the suppressed EIO
v3: Use load-fault-injection to test both error/recovery paths.

References: 8620eb1dbbf2 ("drm/i915/uc: Don't use -EIO to report missing firmware")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213134347.4608-1-chris@chris-wilson.co.uk

drm/i915: Ratelimit request allocation under oom

If we fail to allocate a request, we can reap the outstanding requests
and push them to the request's slab's freelist before trying again. This
forces us to ratelimit malicious clients that tie up all of the system
resources in requests, instead of causing a system-wide oom.

Testcase: igt/gem_shrink/execbuf1
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171212180652.22061-3-chris@chris-wilson.co.uk

drm/i915: Allow fence allocations to fail

If a fence allocation fails in a blocking context, we will sleep on the
fence as a last resort. We can therefore allow ourselves to fail and
sleep on the fence instead of triggering a system-wide oom. This allows
us to throttle malicious clients that are consuming lots of system
resources by capping the amount of memory used by fences.

Testcase: igt/gem_shrink/execbufX
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171212180652.22061-2-chris@chris-wilson.co.uk

drm/i915: Mark up potential allocation paths within i915_sw_fence as might_sleep

As kmalloc is allowed to block (if given the right flags), mark up the
two i915_sw_fence routines that may call kmalloc as potential sleeping
routines.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171212180652.22061-1-chris@chris-wilson.co.uk

drm/i915: Don't check #active_requests from i915_gem_wait_for_idle()

i915_gem_wait_for_idle() is called from inside the shrinker, to ensure
that we drain the last resources from the GPU in dire circumstances (OOM).
As we may allocate whilst building a request, it is then possible to hit
the shrinker with a request under construction, and so we must account
for the incomplete request whilst waiting. In particular, we
preincrement (in reserve_engine) the i915->gt.active_requests counter
and mark the GPU as busy, therefore we can not use that counter for
shortcircuiting the wait-for-idle.

[  950.859024] GEM_BUG_ON(i915->gt.active_requests)
[  950.859041] WARNING: CPU: 2 PID: 2178 at drivers/gpu/drm/i915/i915_gem.c:3615 i915_gem_wait_for_idle.part.56+0x166/0x4e0
[  950.859041] Modules linked in: ccm tun fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_mangle iptable_security iptable_raw arc4 iwldvm mac80211 snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_codec btusb snd_hda_core btrtl btbcm iwlwifi snd_hwdep btintel bluetooth snd_seq snd_seq_device snd_pcm ecdh_generic x86_pkg_temp_thermal tpm_infineon coretemp tpm_tis crc32_pclmul wmi_bmof crc32c_intel iTCO_wdt hp_wmi snd_timer iTCO_vendor_support sparse_keymap tpm_tis_core mei_me cfg80211
[  950.859082]  snd joydev tpm mei rfkill pcspkr wmi soundcore lpc_ich hp_accel lis3lv02d input_polldev binfmt_misc e1000e ptp serio_raw pps_core
[  950.859094] CPU: 2 PID: 2178 Comm: gem_exec_nop Tainted: G     U           4.15.0-rc2+ #900
[  950.859102] Hardware name: Hewlett-Packard HP ProBook 6360b/1620, BIOS 68SCF Ver. B.42 12/29/2010
[  950.859107] task: c5119cb4 task.stack: f3ccb8d8
[  950.859112] EIP: i915_gem_wait_for_idle.part.56+0x166/0x4e0
[  950.859113] EFLAGS: 00010296 CPU: 2
[  950.859114] EAX: 00000024 EBX: f36c1888 ECX: f777a044 EDX: 00000007
[  950.859115] ESI: f36c1888 EDI: edd53958 EBP: edd53970 ESP: edd53938
[  950.859116]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[  950.859117] CR0: 80050033 CR2: b7f39000 CR3: 2f2b3000 CR4: 000406d0
[  950.859118] Call Trace:
[  950.859125]  ? drm_printk+0x70/0x70
[  950.859129]  i915_gem_wait_for_idle+0x18/0x30
[  950.859133]  i915_gem_shrink+0x360/0x410
[  950.859138]  ? vmpressure+0xa8/0xf0
[  950.859142]  ? ktime_get+0x4a/0x100
[  950.859147]  i915_gem_shrink_all+0x21/0x40
[  950.859151]  i915_gem_shrinker_oom+0x23/0x130
[  950.859156]  notifier_call_chain+0x4e/0x70
[  950.859160]  __blocking_notifier_call_chain+0x2f/0x60
[  950.859164]  blocking_notifier_call_chain+0x11/0x20
[  950.859169]  out_of_memory+0x207/0x280
[  950.859174]  __alloc_pages_nodemask+0xd47/0xe60
[  950.859179]  new_slab+0x32d/0x450
[  950.859183]  ___slab_alloc.constprop.81+0x358/0x4e0
[  950.859189]  ? i915_sw_fence_await_dma_fence+0x53/0x160
[  950.859193]  ? __slab_free+0x1fe/0x310
[  950.859197]  ? native_sched_clock+0x1e/0xc0
[  950.859201]  ? i915_gem_request_alloc+0xcf/0x510
[  950.859205]  ? sched_clock+0x9/0x10
[  950.859209]  __slab_alloc.constprop.80+0x29/0x40
[  950.859212]  ? __slab_alloc.constprop.80+0x29/0x40
[  950.859216]  kmem_cache_alloc_trace+0x160/0x1a0
[  950.859220]  ? i915_sw_fence_await_dma_fence+0x53/0x160
[  950.859224]  i915_sw_fence_await_dma_fence+0x53/0x160
[  950.859229]  i915_gem_request_await_dma_fence+0x1eb/0x390
[  950.859233]  i915_gem_request_await_object+0xee/0x230
[  950.859239]  i915_gem_do_execbuffer+0xc16/0x1200
[  950.859246]  ? irqtime_account_irq+0x3e/0xc0
[  950.859251]  ? irq_exit+0x4f/0xb0
[  950.859257]  ? smp_apic_timer_interrupt+0x5f/0x110
[  950.859261]  ? apic_timer_interrupt+0x35/0x3c
[  950.859266]  i915_gem_execbuffer2_ioctl+0x212/0x440
[  950.859270]  ? apic_timer_interrupt+0x35/0x3c
[  950.859274]  ? i915_gem_do_execbuffer+0x1200/0x1200
[  950.859279]  ? insn_get_seg_base+0x1b/0x50
[  950.859283]  ? i915_gem_do_execbuffer+0x1200/0x1200
[  950.859287]  drm_ioctl_kernel+0x51/0xa0
[  950.859291]  drm_ioctl+0x2a3/0x350
[  950.859294]  ? i915_gem_do_execbuffer+0x1200/0x1200
[  950.859300]  ? sched_clock+0x9/0x10
[  950.859303]  ? drm_getunique+0x70/0x70
[  950.859308]  do_vfs_ioctl+0x7d/0x640
[  950.859311]  ? native_sched_clock+0x1e/0xc0
[  950.859315]  ? sched_clock+0x9/0x10
[  950.859319]  ? sched_clock_cpu+0x13/0x120
[  950.859323]  SyS_ioctl+0x4e/0x80
[  950.859326]  do_fast_syscall_32+0x75/0x250
[  950.859331]  ? irq_exit+0x4f/0xb0
[  950.859334]  entry_SYSENTER_32+0x47/0x71
[  950.859338] EIP: 0xb7f81d11
[  950.859339] EFLAGS: 00000296 CPU: 2
[  950.859340] EAX: ffffffda EBX: 00000003 ECX: 40406469 EDX: bfde4c20
[  950.859340] ESI: 00000003 EDI: 40406469 EBP: 00000003 ESP: bfde4b38
[  950.859341]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[  950.859343] Code: e8 30 60 01 00 83 c4 10 83 c3 04 39 f3 75 e0 8b 45 d8 8b 80 14 37 00 00 85 c0 74 13 68 dd 33 e4 c0 68 49 6f e3 c0 e8 4a 55 be ff <0f> ff 5e 5f b8 fe ff ff 3f bb 0a 00 00 00 e8 b7 14 c4 ff 8b 15

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171212132148.8124-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drm/i915/fence: Use rcu to defer freeing of irq_work

It is illegal to perform an immediate free of the struct irq_work from
inside the irq_work callback (as irq_work_run_list modifies work->flags
after execution of the work->func()). As we use the irq_work to
coordinate the freeing of the callback from two different softirq paths,
we need to defer the kfree from inside our irq_work callback, for which
we can use kfree_rcu.

Fixes: 81c0ed21aa91 ("drm/i915/fence: Avoid del_timer_sync() from inside a timer")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213094802.28243-1-chris@chris-wilson.co.uk

drm/i915: Dump the engine state before declaring wedged from wait_for_engines()

If wait_for_engines() fails and we resort to declaring the HW wedged,
dump the engine state for debugging.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211194135.27095-2-chris@chris-wilson.co.uk

drm/i915: Bump timeout for wait_for_engines()

Extract the timeout we use in i915_gem_idle_work_handler() and reuse it
for wait_for_engines() in i915_gem_wait_for_idle(). It too has the same
problem in sometimes having to wait for an extended period before the HW
settles, so make use of the same timeout.

References: 5427f207852d ("drm/i915: Bump wait-times for the final CS interrupt before parking")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211194135.27095-1-chris@chris-wilson.co.uk

drm/i915: Downgrade misleading "Memory usable" message

It never meant what it said, as it was always the total size of the
Global GTT and not a limit upon memory usage. Originally it served as a
quick guide to the largest batch that could be submitted by userspace,
an approximation to its maximum RSS, but was phrased badly. Today with
the 48b ppgtt, it is even more meaningless. Replace with a more specific
debug message; those wanting to know how much "video ram" they have
should consult the userspace libraries for the relevant approximation.

v2: Rebase

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171212113532.22574-1-chris@chris-wilson.co.uk
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drm/i915: Print an error message for a reset failure on gen2

Since on gen2, we do not universally have a GPU reset implementation, we
fail i915_reset() at intel_has_gpu_reset(). However, this is also
intentionally disabled for CI testing and so it only has a debug
message. Promote that debug message to a user-facing error message that
should explain why their machine became unusable following the GPU hang.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211204040.22858-1-chris@chris-wilson.co.uk

docs: fix, intel_guc_loader.c has been moved to intel_guc_fw.c

With commit d9e2e0143c the 'GuC-specific firmware loader' doc
section was removed from intel_guc_loader.c without a
replacement.  So lets remove it from the Kernel-doc::

  .. kernel-doc:: drivers/gpu/drm/i915/intel_guc_loader.c
     :doc: GuC-specific firmware loader

With commit e8668bbcb0 intel_guc_loader.c was renamed to to
intel_guc_fw.c and to name just one, intel_guc_init_hw() was
renamed to intel_guc_fw_upload(). Since we get errors in the
Sphinx build like:

- Error: Cannot open file ./drivers/gpu/drm/i915/intel_guc_loader.c

Change the kernel-doc directive from intel_guc_loader.c to
intel_guc_fw.c

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
[danvet: Rebase onto the partial fix 006c23327f8d
("documentation/gpu/i915: fix docs build error after file rename")]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1513078717-12373-1-git-send-email-markus.heiser@darmarit.de

drm/i915: prefer resource_size_t for everything stolen

Keeps things consistent now that we make use of struct resource. This
should keep us covered in case we ever get huge amounts of stolen
memory.

v2: bunch of missing conversions (Chris)

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-10-matthew.auld@intel.com

drm/i915: give stolen_usable_size a more suitable home

Kick it out of i915_ggtt and keep it grouped with dsm and dsm_reserved,
where it makes the most sense.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-9-matthew.auld@intel.com

drm/i915: make mappable struct resource centric

Now that we are using struct resource to track the stolen region, it is
more convenient if we track the mappable region in a resource as well.

v2: prefer iomap and gmadr naming scheme
    prefer DEFINE_RES_MEM

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-8-matthew.auld@intel.com

drm/i915: make reserved struct resource centric

Now that we are using struct resource to track the stolen region, it is
more convenient if we track the reserved portion of that region in a
resource as well.

v2: s/<= end + 1/< end/ (Chris)
v3: prefer DEFINE_RES_MEM

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-7-matthew.auld@intel.com

drm/i915: make dsm struct resource centric

Now that we are using struct resource to track the stolen region, it is
more convenient if we track dsm in a resource as well.

v2: check range_overflow when writing to 32b registers (Chris)
    pepper in some comments (Chris)
v3: refit i915_stolen_to_dma()
v4: kill ggtt->stolen_size
v5: some more polish

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-6-matthew.auld@intel.com

drm/i915: nuke the duplicated stolen discovery

We duplicate the stolen discovery code in early-quirks and in i915,
however now that the stolen region is exported as a resource from
early-quirks we can nuke the duplication.

v2: check overflows_type

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-5-matthew.auld@intel.com

x86/early-quirks: replace the magical increment start values

Replace the magical +2, +9 etc. with +MB, which is far easier to read.

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-4-matthew.auld@intel.com

x86/early-quirks: export the stolen region as a resource

We duplicate the stolen discovery code in early-quirks and in i915,
however if we just export the region as a resource from early-quirks we
can nuke the duplication.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-3-matthew.auld@intel.com

x86/early-quirks: Extend Intel graphics stolen memory placement to 64bit

To give upcoming SKU BIOSes more flexibility in placing the Intel
graphics stolen memory, make all variables storing the placement or size
compatible with full 64 bit range.

Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-2-matthew.auld@intel.com

drm/i915: Only report a wakeup if the waiter was truly asleep

If we attempt to wake up a waiter, who is currently checking the seqno
it will be in the TASK_INTERRUPTIBLE state and ttwu will report success.
However, it is actually awake and functioning -- so delay reporting the
actual wake up until it sleeps. This fixes some spurious claims of
missed_breadcrumbs when running under heavy load; i.e. sufficient load to
preempt away the newly woken waiter before they complete their checks.
However, it does so at the cost of a rare false negative; where the
waiter changes between the check and ttwu -- the only way to fix that
would be to extend the reporting from ttwu where the check could be done
atomically.

v2: Defend against !CONFIG_SMP
v3: Don't filter out calls to wake_up_process
v4: Drop risky microoptimisation to skip wakeups

Testcase: igt/drv_missed_irq # sanity check we do detect missed_breadcrumb()
Testcase: igt/gem_concurrent_blit # for generating false positives
References: https://bugs.freedesktop.org/show_bug.cgi?id=100007
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171209124710.1606-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

drm/i915: Stop listening to request resubmission from the signaler kthread

The intent here was that we would be listening to
i915_gem_request_unsubmit in order to cancel the signaler quickly and
release the reference on the request. Cancelling the signaler is done
directly via intel_engine_cancel_signaling (called from unsubmit), but
that does not directly wake up the signaling thread, and neither does
setting the request->global_seqno back to zero wake up listeners to the
request->execute waitqueue. So the only time that listening to the
request->execute waitqueue would wake up the signaling kthread would be
on the request resubmission, during which time we would already receive
wake ups from rejoining the global breadcrumbs wait rbtree.

Trying to wake up to release the request remains an issue. If the
signaling was cancelled and no other request required signaling, then it
is possible for us to shutdown with the reference on the request still
held. To ensure that we do not try to shutdown, leaking that request, we
kick the signaling threads whenever we disarm the breadcrumbs, i.e. on
parking the engine when idle.

v2: We do need to be sure to release the last reference on stopping the
kthread; asserting that it has been dropped already is insufficient.

Fixes: d6a2289d9d6b ("drm/i915: Remove the preempted request from the execution queue")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208121033.5236-1-chris@chris-wilson.co.uk
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>

drm/i915/selftests: Free mock_i915->drm.mode_config

Even for the mock i915 device, we need to initialise the
drm.mode_config, as we may ultimately query whether there are any KMS
users deep in the bowels of some paths (e.g. eviction). As we initialise
drm.mode_config we must cleanup after ourselves!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171209210835.32609-1-chris@chris-wilson.co.uk

agp/intel: Flush all chipset writes after updating the GGTT

Before accessing the GGTT we must flush the PTE writes and make them
visible to the chipset, or else the indirect access may end up in the
wrong page. In commit 3497971a71d8 ("agp/intel: Flush chipset writes
after updating a single PTE"), we noticed corruption of the uploads for
pwrite and for capturing GPU error states, but it was presumed that the
explicit calls to intel_gtt_chipset_flush() were sufficient for the
execbuffer path. However, we have not been flushing the chipset between
the PTE writes and access via the GTT itself.

For simplicity, do the flush after any PTE update rather than try and
batch the flushes on a just-in-time basis.

References: 3497971a71d8 ("agp/intel: Flush chipset writes after updating a single PTE")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: drm-intel-fixes@lists.freedesktop.org
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208214616.30147-1-chris@chris-wilson.co.uk

drm/i915/gvt/fb_decoder: Fix out-of-bounds read

In case function skl_format_to_drm returns -EINVAL, fmt turns into a huge
number as fmt is of type u32, hence there is an out-of-bounds read when
using fmt as an index for array skl_pixel_formats at line 225:
plane->bpp = skl_pixel_formats[fmt].bpp;

Fix this by comparing the value returned by function skl_format_to_drm
against the size of array skl_pixel_formats, so in case it is greater than
or equal to the number of items contained in skl_pixel_formats, print an
error message and return -EINVAL.

Addresses-Coverity-ID: 1462495
Addresses-Coverity-ID: 1462502 ("Out-of-bounds read")
Fixes: 9f31d1063b43 ("drm/i915/gvt: Add framebuffer decoder support")
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drm/i915/gvt: refine function emulate_mmio_read/write

These 2 functions are coded by multiple person in multiple patches. The
'return' and 'goto err' are mix-used in same place, which cause the
function looks disorder. Unify to use only 'goto' so that the gvt lock
is acquired in one place and released in one place.

Signed-off-by: Pei Zhang <pei.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drm/i915: Stop showing seqno info from debugfs/i915_interrupt_info

Since the seqno information shown from i915_interrupt_info is just a
small subset of i915_engine_info, remove it.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171209104418.4223-2-chris@chris-wilson.co.uk

drm/i915: Remove debugfs/i915_seqno_info

The per-engine seqno info is now available from
debugfs/i915_engine_info obsoleting debugfs/i915_seqno_info, so remove it.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171209104418.4223-1-chris@chris-wilson.co.uk

drm/i915: Add is-wedged flag to intel_engine_dump()

Comparing the state tested by intel_engine_is_idle() and printed by
intel_engine_dump(), the only bit not shown is whether or not the device
is wedged. Add that little bit of information to the pretty printer so
that if the engine fails to idle we can see why.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208012303.25504-5-chris@chris-wilson.co.uk

drm/i915: Include the global reset count for intel_engine_dump()

Since a global reset affects the engine, include that along side the
per-engine reset counter when pretty printing the engine state in
intel_engine_dump().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208012303.25504-4-chris@chris-wilson.co.uk

drm/i915: Include engine state on detecting a missed breadcrumb/seqno

Now that we have a common engine state pretty printer, we can use that
instead of the adhoc information printed when we miss a breadcrumb.

v2: Rearrange intel_engine_disarm_breadcrumbs() to avoid calling
intel_engine_dump() under the rb spinlock (Mika) and to pretty-print the
error state early so that we include the full list of waiters.
v3: Pass missed breadcrumb msg to pretty-printer as the header
v4: Preserve DRM_DEBUG_DRIVER filtering.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208012303.25504-3-chris@chris-wilson.co.uk

drm/i915: Make engine state pretty-printer header configurable

Pass in a format string (and args) to specify the header to be emitted
along with the engine state when pretty-printing. This allows the header
to be emitted inside the drm_printer stream, so sharing the same prefix
and output characteristics (e.g. debug level and filtering).

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/20171208012303.25504-2-chris@chris-wilson.co.uk

drm/i915: Use snprintf to avoid line-break when pretty-printing engines

When printing the execlist ports, we first print the ELSP header then
follow it with the pretty-printed request. Since switching to
drm_printer and show the output via printk, it automatically appends a
newline to each call (unlike the old seq_printf output). To avoid the
unwanted line break, construct the ELSP request header in a temporary
buffer.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208012303.25504-1-chris@chris-wilson.co.uk

Merge airlied/drm-next into drm-intel-next-queued

Chris requested this backmerge for a reconciliation on
drm_print.h between drm-misc-next and drm-intel-next-queued

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drm/i915: Drop fb reference on load_detect_pipe failure path

When intel_modeset_setup_plane_state() fails drop the local framebuffer
reference before jumping to the error, otherwise we leak the framebuffer.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Fixes: edde361711ef ("drm/i915: Use atomic state to obtain load detection crtc, v3.")
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171207220025.22698-1-chris@chris-wilson.co.uk

intel/atomic: Stop updating legacy fb parameters

Even fbc isn't using this stuff anymore, so time to remove it.

Cleaning up one small piece of the atomic conversion cruft at the time
...

Quick explanation on why the plane->fb assignment is ok to delete: The
core code takes care of the refcounting and legacy ->fb pointer
updating, but drivers are allowed to update it ahead of time. Most
legacy modeset drivers did that as part of their set_config callback
(since that's how the legacy/crtc helpers worked). In i915 we only
need that to make the fbc code happy.

v2: don't nuke the assignement of intel_crtc->config, I accidentally
set CI ablaze :-) Spotted by Maarten. And better explain why nuking
the ->fb assignement shouldn't set off alarm bells.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171207143202.6021-1-daniel.vetter@ffwll.ch

drm/i915: Restore GT performance in headless mode with DMC loaded

It seems that the DMC likes to transition between the DC states a lot when
there are no connected displays (no active power domains) during command
submission.

This activity on DC states has a negative impact on the performance of the
chip with huge latencies observed in the interrupt handlers and elsewhere.
Simple tests like igt/gem_latency -n 0 are slowed down by a factor of
eight.

Work around it by introducing a new power domain named,
POWER_DOMAIN_GT_IRQ, associtated with the "DC off" power well, which is
held for the duration of command submission activity.

CNL has the same problem which will be addressed as a follow-up. Doing
that requires a fix for a DC6 context corruption problem in the CNL DMC
firmware which is yet to be released.

v2:
 * Add commit text as comment in i915_gem_mark_busy. (Chris Wilson)
 * Protect macro body with braces. (Jani Nikula)

v3:
 * Add dedicated power domain for clarity. (Chris, Imre)
 * Commit message and comment text updates.
 * Apply to all big-core GEN9 parts apart for Skylake which is pending DMC
   firmware release.

v4:
 * Power domain should be inner to device runtime pm. (Chris)
 * Simplify NEEDS_CSR_GT_PERF_WA macro. (Chris)
 * Handle async DMC loading by moving the GT_IRQ power domain logic into
   intel_runtime_pm. (Daniel, Chris)
 * Include small core GEN9 as well. (Imre)

v5
 * Special handling for async DMC load is not needed since on failure the
   power domain reference is kept permanently taken. (Imre)

v6:
 * Drop the NEEDS_CSR_GT_PERF_WA macro since all firmwares have now been
   deployed. (Imre, Chris)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100572
Testcase: igt/gem_exec_nop/headless
Cc: Imre Deak <imre.deak@intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk> (v2)
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v5)
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[Imre: Add note about applying the WA on CNL as a follow-up]
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171205132854.26380-1-tvrtko.ursulin@linux.intel.com

drm/i915/gvt: Refine dmabuf_obj cleanup process

In the process of dmabuf_obj cleanup, the dmabuf_obj might be freed during
dmabuf_obj_put leaking intel_gvt_hypervisor_put_vfio_device.

Move intel_gvt_hypervisor_put_vfio_device and all the other dmabuf_obj ops
in front of dmabuf_obj_put and let every dmabuf_obj have a chance to call
intel_gvt_hypervisor_put_vfio_device to fix this leaking issue.

Fixes: e3a0d7976c53 ("drm/i915/gvt: Handle orphan dmabuf_objs")
Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drm/i915/gvt/kvmgt: fill info for ROM/VGA region

Both ROM/VGA region are not supported for vGPU in GVT. But if the device
model want to get those region, we should return the correct information
but not leave the structure with random data. Change to same operation
of BAR3-BAR5 which are also not supported by vGPU.

Refer to function @intel_vgpu_rw.

Signed-off-by: Pei Zhang <pei.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drm/i915/gvt: Rename file render.{c, h} to mmio_context.{c, h}

Rename the files to reflect their real role - to switch the mmio context of
each vGPU engine.

v2: update Makefile.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drm/i915/gvt: Remove MMIO barrier in MMIO switch

After engine mmio switched, software still need write workload
submission registers. So we can remove the MMIO barriar in MMIO
switch.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drm/i915/gvt: Select appropriate mmio list at initialization time

Select appropriate mmio list at initialization time, so we don't need to
do duplicated work at where requires the mmio list.

V2:
  - Add a termination mark of mmio list.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drm/i915/gvt: Refine the ring mmio list definition

To improve the readability, let's remove the hard code for each mmio
definition. The raw offset remained as a comment, which give us an
offset based view.

This refine is to make it convenient for new platform enabling.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drm/i915/execlists: Cache ELSP register offset

Currently on every submission, we recalculate the ELSP register offset
for the engine, after chasing the pointers to find the iomem base. Since
this is fixed for the lifetime of the driver, record the offset in the
execlists struct.

In practice the difference is negligible, it just happens to remove 27
bytes of eyesore pointer dancing from next to the hottest instruction
(which is itself due to stalling for a cache miss) in perf profiles of
the execlists_submission_tasklet().

v2: Trim off one more elsp local.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171207222434.17686-1-chris@chris-wilson.co.uk

drm/i915: Refactor common list iteration over GGTT vma

In quite a few places, we have a list iteration over the vma on an
object that only want to inspect GGTT vma. By construction, these are
placed at the start of the list, so we have copied that knowledge into
many callsites. Pull that knowledge back to i915_vma.h and provide a
for_each_ggtt_vma() to tidy up the code.

v2: Add a backreference from vma_create() to remind ourselves why we put
ggtt vma at the head of the obj->vma_list (and ppgtt vma at the tail).
v3: Fixup s/vma/V/

Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171207211407.31549-1-chris@chris-wilson.co.uk