drm/xe/pat: Add helper to query compression enable status

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 <nitin.r.gote@intel.com>
CC: Sanjay Yadav <sanjay.kumar.yadav@intel.com>
CC: Matt Roper <matthew.d.roper@intel.com>
Suggested-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Xin Wang <x.wang@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Nitin Gote <nitin.r.gote@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Sanjay Yadav <sanjay.kumar.yadav@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20251110221458.1864507-2-x.wang@intel.com

diff --git a/drivers/gpu/drm/xe/xe_pat.c b/drivers/gpu/drm/xe/xe_pat.c
index 68171cceea18ef81848f2471cced4657d0a780cb..1b4d5d3def0fe8bc43262602af4083be7519b43d 100644 (file)
--- a/drivers/gpu/drm/xe/xe_pat.c
+++ b/drivers/gpu/drm/xe/xe_pat.c
@@ -196,6 +196,12 @@ u16 xe_pat_index_get_coh_mode(struct xe_device *xe, u16 pat_index)
        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)
 {

diff --git a/drivers/gpu/drm/xe/xe_pat.h b/drivers/gpu/drm/xe/xe_pat.h
index 05dae03a5f545e6254ebaf3ccf906006563dff05..b8559120989ed533e713f29b0d3a199c47081742 100644 (file)
--- a/drivers/gpu/drm/xe/xe_pat.h
+++ b/drivers/gpu/drm/xe/xe_pat.h
@@ -58,4 +58,14 @@ int xe_pat_dump(struct xe_gt *gt, struct drm_printer *p);
  */
 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