drm/xe/uapi: add the userspace bits for small-bar

Mostly the same as i915. We add a new hint for userspace to force an
object into the mappable part of vram.

We also need to tell userspace how large the mappable part is. In Vulkan
for example, there will be two vram heaps for small-bar systems. And
here the size of each heap needs to be known. Likewise the used/avail
tracking needs to account for the mappable part.

We also limit the available tracking going forward, such that we limit
to privileged users only, since these values are system wide and are
technically considered an info leak.

v2 (Maarten):
- s/NEEDS_CPU_ACCESS/NEEDS_VISIBLE_VRAM/ in the uapi. We also no
longer require smem as an extra placement. This is more flexible,
and lets us use this for clear-color surfaces, since we need CPU access
there but we don't want to attach smem, since that effectively disables
CCS from kernel pov.
- Reject clear-color CCS buffers where NEEDS_VISIBLE_VRAM is not set,
instead of migrating it behind the scenes.
v3 (José):
- Split the changes that limit the accounting for perfmon_capable()
into a separate patch.
- Use XE_BO_CREATE_VRAM_MASK.
v4 (Gwan-gyeong Mun):
- Add some kernel-doc for the query bits.
v5:
- One small kernel-doc correction. The cpu_visible_size and
corresponding used tracking are always zero for non
XE_MEM_REGION_CLASS_VRAM.
v6:
- Without perfmon_capable() it likely makes more sense to report as
zero, instead of reporting as used == total size. This should give
similar behaviour as i915 which rather tracks free instead of used.
- Only enforce NEEDS_VISIBLE_VRAM on rc_ccs_cc_plane surfaces when the
device is actually small-bar.

Testcase: igt/tests/xe_query
Testcase: igt/tests/xe_mmap@small-bar
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Filip Hazubski <filip.hazubski@intel.com>
Cc: Carl Zhang <carl.zhang@intel.com>
Cc: Effie Yu <effie.yu@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drm/xe: Move VRAM from GT to tile

On platforms with VRAM, the VRAM is associated with the tile, not the
GT.

v2:
- Unsquash the GGTT handling back into its own patch.
- Fix kunit test build
v3:
- Tweak the "FIXME" comment to clarify that this function will be
completely gone by the end of the series. (Lucas)
v4:
- Move a few changes that were supposed to be part of the GGTT patch
back to that commit. (Gustavo)
v5:
- Kerneldoc parameter name fix.

Cc: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://lore.kernel.org/r/20230601215244.678611-11-matthew.d.roper@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drm/xe/buddy: add visible tracking

Replace the allocation code with the i915 version. This simplifies the
code a little, and importantly we get the accounting at the mgr level,
which is useful for debug (and maybe userspace), plus per resource
tracking so we can easily check if a resource is using one or pages in
the mappable part of vram (useful for eviction), or if the resource is
completely within the mappable portion (useful for checking if the
resource can be safely CPU mapped).

v2: Fix missing PAGE_SHIFT
v3: (Gwan-gyeong Mun)
- Fix incorrect usage of ilog2(mm.chunk_size).
- Fix calculation when checking for impossible allocation sizes, also
check much earlier.
v4: (Gwan-gyeong Mun)
- Fix calculation when extending the [fpfn, lpfn] range due to the
roundup_pow_of_two().
v5: (Gwan-gyeong Mun)
- Move the check for running out of mappable VRAM to before doing any of
the roundup_pow_of_two().
v6: (Jani)
- Stop abusing BUG_ON(). We can easily just use WARN_ON() here and
return a proper error to the caller, which is much nicer if we ever
trigger these.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drm/xe: Implement stolen memory.

This adds support for stolen memory, with the same allocator as
vram_mgr. This allows us to skip a whole lot of copy-paste,
by re-using parts of xe_ttm_vram_mgr.

The stolen memory may be bound using VM_BIND, so it performs like any
other memory region.

We should be able to map a stolen BO directly using the physical memory
location instead of through GGTT even on old platforms, but I don't know
what the effects are on coherency.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drm/xe: Introduce a new DRM driver for Intel GPUs

Xe, is a new driver for Intel GPUs that supports both integrated and
discrete platforms starting with Tiger Lake (first Intel Xe Architecture).

The code is at a stage where it is already functional and has experimental
support for multiple platforms starting from Tiger Lake, with initial
support implemented in Mesa (for Iris and Anv, our OpenGL and Vulkan
drivers), as well as in NEO (for OpenCL and Level0).

The new Xe driver leverages a lot from i915.

As for display, the intent is to share the display code with the i915
driver so that there is maximum reuse there. But it is not added
in this patch.

This initial work is a collaboration of many people and unfortunately
the big squashed patch won't fully honor the proper credits. But let's
get some git quick stats so we can at least try to preserve some of the
credits:

Co-developed-by: Matthew Brost <matthew.brost@intel.com>
Co-developed-by: Matthew Auld <matthew.auld@intel.com>
Co-developed-by: Matt Roper <matthew.d.roper@intel.com>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Co-developed-by: Francois Dugast <francois.dugast@intel.com>
Co-developed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Co-developed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Co-developed-by: Philippe Lecluse <philippe.lecluse@intel.com>
Co-developed-by: Nirmoy Das <nirmoy.das@intel.com>
Co-developed-by: Jani Nikula <jani.nikula@intel.com>
Co-developed-by: José Roberto de Souza <jose.souza@intel.com>
Co-developed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Co-developed-by: Dave Airlie <airlied@redhat.com>
Co-developed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Co-developed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Co-developed-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>