The plan is to move all the mmio stuff into the display code itself.
As a first step implement the register polling in intel_de.c.

Currently i915 and xe implement this stuff in slightly different
ways, so there are some functional changes here. Try to go for a
reasonable middle ground between the i915 and xe implementations:
- the exponential backoff limit is the simpler approach taken
  by i915 (== just clamp the max sleep duration to 1 ms)
- the fast vs. slow timeout handling is similar to i915 where
  we first try the fast timeout and then again the slow timeout
  if the condition still isn't satisfied. xe just adds up the
  timeouts together, which is a bit weird.
- the atomic wait variant uses udelay() like xe, whereas i915
  has no udelay()s in its atomic loop. As a compromise go for a
  fixed 1 usec delay  for short waits, instead of the somewhat
  peculiar xe behaviour where it effectively just does one
  iteration of the loop.
- keep the "use udelay() for < 10 usec waits" logic (which
  more or less mirrors fsleep()), but include an explicit
  might_sleep() even for these short waits when called from
  a non-atomic intel_de_wait*() function. This should prevent
  people from calling the non-atomic functions from the wrong
  place.

Eventually we may want to switch over to poll_timeout*(),
but that lacks the exponential backoff, so a bit too
radical to change in one go.

v2: Initialize ret in intel_de_wait_for_register() to avoid a
    warning from the compiler. This is actually a false positive
    since we always have fast_timeout_us!=0 when slow_timeout_us!=0,
    but the compiler can't see that

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260323094304.8171-1-ville.syrjala@linux.intel.com

As there are no more compat users left for intel_step_name(), remove the
macro and use the more direct include for the enumerations.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://patch.msgid.link/816e3f6dda0a112392e8f8ccff820a81aff63f32.1773663208.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Add a shared header that's used by i915, xe, and i915 display.

This allows us to drop the compat-i915-headers/i915_reg_defs.h include
from xe_reg_defs.h. All the register macro helpers were subtly pulled in
from i915 to all of xe through this.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/fcd70f3317755bf98a6e7ae88974aa8ba06efd1e.1772042022.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Move compat i915_vma.h to xe_display_vma.h, and remove all extra
cruft. Drop the i915_ggtt_offset() wrapper in favour of using
xe_ggtt_node_addr() directly.

The usefulness of the I915_TILING_X and I915_TILING_Y undef/define is
unclear, since uapi/drm/i915_drm.h is included in other paths as well.

The naming of struct i915_vma is a bit unfortunate in xe, but (at least
for now) a necessity for maintaining type safety on the opaque type.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/ecd5d75981b4b21c3da3b1831faceccfe385d898.1772212579.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

It's unclear what the direction of the VMA abstraction in the parent
interface should be, but convert i915_vma_fence_id() to parent interface
for starters. This paves the way for making struct i915_vma opaque
towards display.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/036f4b2d20cc1b0a7ab814beb5bb914c53b6eb53.1772212579.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Display Code is made independent of i915_reg.h, hence
it can be dropped from compat header.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patch.msgid.link/20260226175531.2324526-1-uma.shankar@intel.com

Sync with v7.0-rc1 which contains a few treewide changes affecting i915.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Call the parent driver pcode functions through the parent interface
function pointers instead of expecting both to have functions of the
same name.

In i915, add the interface to existing intel_pcode.[ch], while in xe
move them to new display/xe_display_pcode.[ch] and build it only for
CONFIG_DRM_XE_DISPLAY=y.

Do not add separate write and write_timeout calls in the
interface. Instead, handle the default 1 ms timeout in the
intel_parent.c glue layer.

This drops the last intel_pcode.h includes from display, and allows us
to remove the corresponding xe compat header.

v2: initialize .pcode in i915

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/20260126112925.2452171-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Add a write counterpart to intel_de_read8(). Will be used for
MMIO access to VGA registers on pre-g4x.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20251208182637.334-12-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

UAPI Changes:
 - Remove unused KEEP_ACTIVE flag in the new multi queue uAPI (Niranjana)
 - Expose new temperature attributes in HWMON (Karthik)

Driver Changes:
 - Force i2c into polling mode when in survivability (Raag)
 - Validate preferred system memory placement in xe_svm_range_validate (Brost)
 - Adjust page count tracepoints in shrinker (Brost)
 - Fix a couple drm_pagemap issues with multi-GPU (Brost)
 - Define GuC firmware for NVL-S (Roper)
 - Handle GT resume failure (Raag)
 - Improve wedged mode handling (Lukasz)
 - Add missing newlines to drm_warn messages (Osama)
 - Fix WQ_MEM_RECLAIM passed as max_active to alloc_workqueue (Marco)
 - Page-reclaim fixes and PRL stats addition (Brian)
 - Fix struct guc_lfd_file_header kernel-doc (Jani)
 - Allow compressible surfaces to be 1-way coherent (Xin)
 - Fix DRM scheduler layering violations in Xe (Brost)
 - Minor improvements to MERT code (Michal)
 - Privatize struct xe_ggtt_node (Maarten)
 - Convert wait for lmem init into an assert (Bala)
 - Enable GSC loading and PXP for PTL (Daniele)
 - Replace use of system_wq with tlb_inval->timeout_wq (Marco)
 - VRAM addr range bit expansion (Fei)
 - Cleanup unused header includes (Roper)

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/aWkSxRQK7VhTlP32@intel.com