[PATCH v3 2/3] drm/xe: Expose display alignment requirement

[Zbigniew Kempczyński]

Scanout buffer on Battlemage requires allocation in 64K contigues
pages to support Tile4 + compression what differs from normal bo
requirements. Expose display alignment configuration to userspace
to ensure it will properly align requested memory.

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/xe/xe_query.c | 4 +++-
 include/uapi/drm/xe_drm.h     | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_query.c b/drivers/gpu/drm/xe/xe_query.c
index 4e01df6b1b7a..c32894f3eea1 100644
--- a/drivers/gpu/drm/xe/xe_query.c
+++ b/drivers/gpu/drm/xe/xe_query.c
@@ -313,7 +313,7 @@ static int query_mem_regions(struct xe_device *xe,
 
 static int query_config(struct xe_device *xe, struct drm_xe_device_query *query)
 {
-	const u32 num_params = DRM_XE_QUERY_CONFIG_MAX_EXEC_QUEUE_PRIORITY + 1;
+	const u32 num_params = DRM_XE_QUERY_CONFIG_DISPLAY_ALIGNMENT + 1;
 	size_t size =
 		sizeof(struct drm_xe_query_config) + num_params * sizeof(u64);
 	struct drm_xe_query_config __user *query_ptr =
@@ -342,6 +342,8 @@ static int query_config(struct xe_device *xe, struct drm_xe_device_query *query)
 	config->info[DRM_XE_QUERY_CONFIG_VA_BITS] = xe->info.va_bits;
 	config->info[DRM_XE_QUERY_CONFIG_MAX_EXEC_QUEUE_PRIORITY] =
 		xe_exec_queue_device_get_max_priority(xe);
+	config->info[DRM_XE_QUERY_CONFIG_DISPLAY_ALIGNMENT] =
+		xe->info.vram_flags & XE_VRAM_FLAGS_DISPLAY_NEED64K ? SZ_64K : SZ_4K;
 
 	if (copy_to_user(query_ptr, config, size)) {
 		kfree(config);
diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
index 19619d4952a8..c7a930dbf58c 100644
--- a/include/uapi/drm/xe_drm.h
+++ b/include/uapi/drm/xe_drm.h
@@ -398,6 +398,8 @@ struct drm_xe_query_mem_regions {
  *  - %DRM_XE_QUERY_CONFIG_VA_BITS - Maximum bits of a virtual address
  *  - %DRM_XE_QUERY_CONFIG_MAX_EXEC_QUEUE_PRIORITY - Value of the highest
  *    available exec queue priority
+ *  - %DRM_XE_QUERY_CONFIG_DISPLAY_ALIGNMENT - Alignment of contigous physical
+ *    memory allocation required by the display, typically SZ_4K or SZ_64K
  */
 struct drm_xe_query_config {
 	/** @num_params: number of parameters returned in info */
@@ -412,6 +414,7 @@ struct drm_xe_query_config {
 #define DRM_XE_QUERY_CONFIG_MIN_ALIGNMENT		2
 #define DRM_XE_QUERY_CONFIG_VA_BITS			3
 #define DRM_XE_QUERY_CONFIG_MAX_EXEC_QUEUE_PRIORITY	4
+#define DRM_XE_QUERY_CONFIG_DISPLAY_ALIGNMENT		5
 	/** @info: array of elements containing the config info */
 	__u64 info[];
 };
-- 
2.34.1