[Intel-gfx] [PATCH] Revert "drm/i915/uapi: expose GTT alignment"

[Matthew Auld]

The process for merging uAPI is to have UMD side ready and reviewed and
merged before merging. Revert for now until that is ready.

This reverts commit d54576a074a29d4901d0a693cd84e1a89057f694.

Reported-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Cc: Michal Mrozek <michal.mrozek at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Stuart Summers <stuart.summers at intel.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Yang A Shi <yang.a.shi at intel.com>
Cc: Nirmoy Das <nirmoy.das at intel.com>
Cc: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
---
 drivers/gpu/drm/i915/i915_query.c |  1 -
 include/uapi/drm/i915_drm.h       | 29 ++---------------------------
 2 files changed, 2 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index 111377f210ed..6ec9c9fb7b0d 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -498,7 +498,6 @@ static int query_memregion_info(struct drm_i915_private *i915,
 		info.region.memory_class = mr->type;
 		info.region.memory_instance = mr->instance;
 		info.probed_size = mr->total;
-		info.gtt_alignment = mr->min_page_size;
 
 		if (mr->type == INTEL_MEMORY_LOCAL)
 			info.probed_cpu_visible_size = mr->io_size;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index c2dce8633005..9bf281ec1125 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -3466,33 +3466,8 @@ struct drm_i915_memory_region_info {
 	/** @region: The class:instance pair encoding */
 	struct drm_i915_gem_memory_class_instance region;
 
-	union {
-		/** @rsvd0: MBZ */
-		__u32 rsvd0;
-		/**
-		 * @gtt_alignment:
-		 *
-		 * The minimum required GTT alignment for this type of memory.
-		 * When allocating a GTT address it must be aligned to this
-		 * value or larger. On some platforms the kernel might opt to
-		 * using 64K pages for I915_MEMORY_CLASS_DEVICE, where 64K GTT
-		 * pages can then be used if we also use 64K GTT alignment.
-		 *
-		 * NOTE: If this is zero then this must be an older
-		 * kernel which lacks support for this field.
-		 *
-		 * Side note: For larger objects (especially for
-		 * I915_MEMORY_CLASS_DEVICE), like 2M+ in size, userspace should
-		 * consider potentially bumping the GTT alignment to say 2M,
-		 * which could potentially increase the likelihood of the kernel
-		 * being able to utilise 2M GTT pages underneath, if the layout
-		 * of the physical pages allows it.  On some configurations we
-		 * can then also use a more efficient page-table layout, if we
-		 * can't use the more desirable 2M GTT page, so long as we know
-		 * that the entire page-table will be used by this object.
-		 */
-		__u32 gtt_alignment;
-	};
+	/** @rsvd0: MBZ */
+	__u32 rsvd0;
 
 	/**
 	 * @probed_size: Memory probed by the driver
-- 
2.37.3