We need debugfs entry to expose some debug information of gvt and vGPUs.
The first tool will be added is mmio-diff, which help to find the
difference values of host and vGPU mmio. It's useful for platform
enabling.

This patch just add a basic debugfs infrastructure, each vGPU has its own
sub-folder. Two simple attributes are created as a template.
.
├── num_tracked_mmio
├── vgpu1
|   └── active
└── vgpu2
    └── active
Signed-off-by: NChangbin Du <changbin.du@intel.com>
Reviewed-by: NZhi Wang <zhi.a.wang@intel.com>
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

all the vGPU type related code in kvmgt will be moved into
gvt.c/gvt.h files while the common vGPU type related interfaces
will be called.

v2:
- intel_gvt_{init,cleanup}_vgpu_type_groups are initialized in
  gvt part. (Wang, Zhi)
Signed-off-by: Nfred gao <fred.gao@intel.com>
Reviewed-by: NZhi Wang <zhi.a.wang@intel.com>
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

In this patch, all the vGPU type related code will be merged into
same gvt file and the common interface will be exposed to both
XenGT and KvmGT.

v2:
- remove the useless mdev_* gvt_ops.
  add get_gvt_attr ops for MPT module.
  intel_gvt_{init,cleanup}_vgpu_type_groups are initialized in
  gvt part. (Wang, Zhi)
- set gvt_vgpu_type_groups[i] to NULL. (Zhang,Xiong)
Signed-off-by: Nfred gao <fred.gao@intel.com>
Reviewed-by: NZhi Wang <zhi.a.wang@intel.com>
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Move clean_workloads() into scheduler.c since it's not specific to
execlist.

v2:

- Remove clean_workloads in intel_vgpu_select_submission_ops. (Zhenyu)
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Introduce an generic API to reset vGPU virtual submission interface.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Introduce vGPU submission ops to support easy switching submission mode
of one vGPU between different OSes.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Now the function has been moved into scheduler.c. The extra declaration
is not necessary.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Move common vGPU workload creation functions into scheduler.c since
they are not specific to execlist emulation.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Move common workload preparation into prepare_workload() in scheduler.c,
as they are not specific to execlist emulation.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Factor out prepare_workload() for the following re-factor.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Factor out vGPU workload creation/destroy functions since they are not
specific to execlist emulation.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

It's better enable/disable and classify gvt debug info dynamically.
This patch change it to dyndbg so can be dynamically enable/disable
each item. All gvt log can be enabled by,
 $ echo 'file *gvt* +p' > /sys/kernel/debug/dynamic_debug/control
Signed-off-by: NShuo Liu <shuo.a.liu@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

An earlier fix changed the return type from find_bb_size however the
integer return is being assigned to a unsigned int so the -ve error
check will never be detected. Make bb_size an int to fix this.

Detected by CoverityScan CID#1456886 ("Unsigned compared against 0")

Fixes: 1e3197d6 ("drm/i915/gvt: Refine error handling for perform_bb_shadow")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

When a scan error occurs in submit_context, this patch is to
decrease the mm ref count and free the workload struct before
the workload is abandoned.

v2:
- submit_context related code should be combined together. (Zhenyu)

v3:
- free all the unsubmitted workloads. (Zhenyu)

v4:
- refine the clean path. (Zhenyu)

v5:
- polish the title. (Zhenyu)
Signed-off-by: Nfred gao <fred.gao@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

When a scan error occurs in dispatch_workload, this patch is to
check the healthy state and free all the queued workloads before
the failsafe mode is entered.
Signed-off-by: Nfred gao <fred.gao@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

Generally, there are 3 types of errors during command scan: a) some
commands might be unknown with EBADRQC;  b) some cmd access invalid
address with EFAULT; c) some unexpected force nonpriv cmd with EPERM.
later the healthy state can be judged through the return error.

v2:
- remove some internal i915 errors rating.  (Zhenyu)

v3:
- the healthy state is judged through the internal defined return
  error. (Zhenyu)
- force non priv cmd error can be ignored. (Kevin)

v4:
- reuse standard defined errno instead of recreate, e.g EBADRQC for
  unknown cmd, EFAULT for invalid address, EPERM for nonpriv. (Zhenyu)

v5:
- remove some irrelevant code for the patch.
- fix typo of vgpu_is_vm_unhealthy. (Zhenyu)

v6:
- move the healthy check and failsafe code into another patch. (Zhenyu)

v7:
- polish title and commit message. (Zhenyu)
Signed-off-by: Nfred gao <fred.gao@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

Theoretically, the largest bulk of commands in the ring buffer of an
engine might be the first submission, which usually contains a lot
of commands to initialize the HW. After removing the initial allocation
of the ring scan buffer and let krealloc() do everything we need, we
still have a big chance to get the buffer of suitable size in the first
submission.

Tested on my SKL NUC.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Move ring scan buffers into intel_vgpu_submission since they belongs to
a part of vGPU submission stuffs.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

"reserved" means reserve something from somewhere. Actually they are
buffers used by command scanner. Rename it to ring_scan_buffer.

v2:

- Remove the usage of an extra variable. (Zhenyu)

Fixes: 0a53bc07 ("drm/i915/gvt: Separate cmd scan from request allocation")
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

The pointer points to the original memory can never take the return value
of krealloc().
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Move tlb_handle_pending into intel_vgpu_submssion since it belongs to a
part of vGPU submission stuffs
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Introduce intel_vgpu_submission to hold all members related to submission
in struct intel_vgpu before.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

Move vGPU workload cache initialization/de-initialization into
intel_vgpu_{setup, clean}_submission() since they are not specific to
execlist stuffs.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

To move workload related functions into scheduler.c, an expected way is
to collect all the init/clean functions related to vGPU workload
submission into fewer functions.

Rename intel_vgpu_{init, clean}_gvt_context() for above usage in future.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

The context descriptors in elsp_dwords are stored in a reversed order and
the definition of context descriptor is also reversed. The revesred stuff
is hard to be used and might cause misunderstanding. Make them in the right
oder for following code re-factoring.

Tested on my SKL NUC.
Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>

opregion emulated with a copy from host which leads to some display
bugs such as guest resolution adjustment failure due to host opregion
fail to claim port D support. with a fake opregion table provided
to fully emulate opregion to meet guest port requirement.

v1 - initial patch
v2 - reforamt opregion arrary with 0x02x output
v3 - opregion array removed with opregion generation on host initizaiton
v4 - rebased v3 patch from stable branch to staging branch which also has
     different struct child_device_config and addressed v3 review comments.
Signed-off-by: NXiaolin Zhang <xiaolin.zhang@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

WaEnablePooledEuFor2x6 only applies to preproduction models, unsupported
since commit 0102ba1f ("drm/i915: Add early BXT sdv to the list of
preproduction machines").
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114135116.30036-1-chris@chris-wilson.co.ukReviewed-by: NDavid Weinehall <david.weinehall@linux.intel.com>

At the start of building a request, we would wait for roughly enough
space to fit the average request (to reduce the likelihood of having to
wait and abort partway through request construction). To achieve we
would try to begin a 0-length command packet, this just adds extra
confusion so make the wait-for-space explicit, as in the next patch we
want to move it from the backend to the i915_gem_request_alloc() so it
can ensure that the wait-for-space is the first operation in building a
new request.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115151204.8105-2-chris@chris-wilson.co.uk

We don't actually emit any commands into the ringbuffer, so we set it
very small. However, an upcoming change centralises the wait-for-space
into i915_gem_request_alloc() and that imposes a minimum size upon all
ringbuffers (mock or real) of MIN_SPACE_FOR_ADD_REQUEST. Grow the
mock ringbuffer such that we allocate a single page for the struct+buffer,
satisfying the new condition without wasting too much space.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115151204.8105-1-chris@chris-wilson.co.uk

gcc-4.7.3 is confused by the guards inside intel_ppat_get() and reports:

drivers/gpu/drm/i915/i915_gem_gtt.c: In function ‘intel_ppat_get’:
drivers/gpu/drm/i915/i915_gem_gtt.c:3044:27: warning: ‘entry’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Forgive the compiler this once, and rearrange the code so that entry is
always initialised.

v2: Flavour with a bit of NULL (instead of ERR_PTR(-ENOSPC))
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115131705.16341-1-chris@chris-wilson.co.ukReviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>

Silence sparse warnings by using __iomem markup and io accessors.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114191842.19063-1-chris@chris-wilson.co.uk

While I have no solid proof that ILK follows the ELK path when it
comes to the stolen memory reserved area, there are some hints that
it might be the case. Unfortunately my ILK doesn't have this enabled,
and no way to enable it via the BIOS it seems.

So let's have ILK use the ELK code path, and let's toss in a WARN
into the code to see if we catch anyone with an ILK that has this
enabled to further analyze the situation.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171102151737.23336-3-ville.syrjala@linux.intel.comAcked-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>

Now that we should be properly filtering out the cases when the stolen
reserved area is disabled, let's convert the debug message about a
misplaced reserved area into an error.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171102151737.23336-2-ville.syrjala@linux.intel.comReviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>

Apparently there are some machines that put semi-sensible looking values
into the stolen "reserved" base and size, except those values are actually
outside the stolen memory. There is a bit in the register which
supposedly could tell us whether the reserved area is even enabled or
not. Let's check for that before we go trusting the base and size.

Cc: Tomi Sarvela <tomi.p.sarvela@intel.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171102151737.23336-1-ville.syrjala@linux.intel.comReviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>

Fix copy/paste fail in kerneldocs for intel_audio_codec_disable().

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Suggested-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114191127.16188-1-ville.syrjala@linux.intel.comReviewed-by: NDhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

Quoting Ville: "the forcewake timer might still be active until the uncore
suspend, and having active forcewakes while we've already told the GT wake
stuff to stop acting normally doesn't seem quite right to me."
Reported-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Suggested-by: NImre Deak <imre.deak@intel.com>
Reviewed-by: NImre Deak <imre.deak@intel.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114135518.15981-3-hdegoede@redhat.com

intel_uncore_suspend() unregisters the uncore code's PMIC bus access
notifier and gets called on both normal and runtime suspend.

intel_uncore_resume_early() re-registers the notifier, but only on
normal resume. Add a new intel_uncore_runtime_resume() function which
only re-registers the notifier and call that on runtime resume.

Cc: stable@vger.kernel.org
Reported-by: NImre Deak <imre.deak@intel.com>
Reviewed-by: NImre Deak <imre.deak@intel.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114135518.15981-2-hdegoede@redhat.com

assert_rpm_wakelock_held is triggered from i915_pmic_bus_access_notifier
even though it gets unregistered on (runtime) suspend, this is caused
by a race happening under the following circumstances:

intel_runtime_pm_put does:

   atomic_dec(&dev_priv->pm.wakeref_count);

   pm_runtime_mark_last_busy(kdev);
   pm_runtime_put_autosuspend(kdev);

And pm_runtime_put_autosuspend calls intel_runtime_suspend from
a workqueue, so there is ample of time between the atomic_dec() and
intel_runtime_suspend() unregistering the notifier. If the notifier
gets called in this windowd assert_rpm_wakelock_held falsely triggers
(at this point we're not runtime-suspended yet).

This commit adds disable_rpm_wakeref_asserts and
enable_rpm_wakeref_asserts calls around the
intel_uncore_forcewake_get(FORCEWAKE_ALL) call in
i915_pmic_bus_access_notifier fixing the false-positive WARN_ON.

Changes in v2:
-Reword comment explaining why disabling the wakeref asserts is
 ok and necessary

Cc: stable@vger.kernel.org
Reported-by: NFKr <bugs-freedesktop@ubermail.me>
Reviewed-by: NImre Deak <imre.deak@intel.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171110150301.9601-2-hdegoede@redhat.com

smatch does not track initialised values as well as gcc, and this
triggers many warnings by smatch not presented by gcc. Silence smatch by
initialising the error values to -ENODEV, which we use to denote
internal errors. (If we see a selftest fail with a silent -ENODEV, we
know smatch was right!)

v2: smatch was right about igt_create_vma(), it may unlikely fail on the
first object allocation which we want to be loud about.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114223346.25958-1-chris@chris-wilson.co.ukReviewed-by: NDhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

Resuming GEM presumes it can talk to hw, in particular to ensure the
kernel context is loaded upon resume for powersaving. If the GuC is
still asleep at this point, we upset the HW. Rearrange the resume such
that we restore the original order of init-hw, resume-guc, use-gem.

Fixes: 37cd3300 ("drm/i915: Remove redundant intel_autoenable_gt_powersave()")
References: a1c41994 ("drm/i915/guc: Add host2guc notification for suspend and resume")
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Alex Dai <yu.dai@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114130300.25677-2-chris@chris-wilson.co.ukReviewed-by: NSagar Arun Kamble <sagar.a.kamble@intel.com>