[PATCH 6.18 379/396] drm/xe/pat: Add helper to query compression enable status

6.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xin Wang <[email protected]>

[ Upstream commit b2bce0e551e89af37cfcb1b1158d80f369eeea3f ]

Add xe_pat_index_get_comp_en() helper function to check whether
compression is enabled for a given PAT index by extracting the
XE2_COMP_EN bit from the PAT table entry.

There are no current users, however there are multiple in-flight series
which will all use this helper.

CC: Nitin Gote <[email protected]>
CC: Sanjay Yadav <[email protected]>
CC: Matt Roper <[email protected]>
Suggested-by: Matthew Auld <[email protected]>
Signed-off-by: Xin Wang <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Reviewed-by: Nitin Gote <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Reviewed-by: Sanjay Yadav <[email protected]>
Signed-off-by: Matthew Auld <[email protected]>
Link: https://patch.msgid.link/[email protected]
Stable-dep-of: 7bc597ce74ba ("drm/xe/vm: Fix BO prefetch with CONSULT_MEM_ADVISE_PREF_LOC")
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 drivers/gpu/drm/xe/xe_pat.c |    6 ++++++
 drivers/gpu/drm/xe/xe_pat.h |   10 ++++++++++
 2 files changed, 16 insertions(+)

--- a/drivers/gpu/drm/xe/xe_pat.c
+++ b/drivers/gpu/drm/xe/xe_pat.c
@@ -160,6 +160,12 @@ u16 xe_pat_index_get_coh_mode(struct xe_
 	return xe->pat.table[pat_index].coh_mode;
 }
 
+bool xe_pat_index_get_comp_en(struct xe_device *xe, u16 pat_index)
+{
+	WARN_ON(pat_index >= xe->pat.n_entries);
+	return !!(xe->pat.table[pat_index].value & XE2_COMP_EN);
+}
+
 static void program_pat(struct xe_gt *gt, const struct xe_pat_table_entry table[],
 			int n_entries)
 {
--- a/drivers/gpu/drm/xe/xe_pat.h
+++ b/drivers/gpu/drm/xe/xe_pat.h
@@ -58,4 +58,14 @@ void xe_pat_dump(struct xe_gt *gt, struc
  */
 u16 xe_pat_index_get_coh_mode(struct xe_device *xe, u16 pat_index);
 
+/**
+ * xe_pat_index_get_comp_en - Extract the compression enable flag for
+ * the given pat_index.
+ * @xe: xe device
+ * @pat_index: The pat_index to query
+ *
+ * Return: true if compression is enabled for this pat_index, false otherwise.
+ */
+bool xe_pat_index_get_comp_en(struct xe_device *xe, u16 pat_index);
+
 #endif