From: Michal Wajdeczko <michal.wajdeczko@intel.com>
Date: Wed, 18 Feb 2026 20:55:43 +0000 (+0100)
Subject: drm/xe/pf: Expose LMTT page size
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=2d892455f38b82fb4e93f45e7a8e8ea41683ca78;p=thirdparty%2Fkernel%2Flinux.git

drm/xe/pf: Expose LMTT page size

The underlying LMTT implementation already provides the info about
the page size it is using.  There is no need to have a separate
helper function that is making assumption about the required size.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Piotr Piórkowski <piotr.piorkowski@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patch.msgid.link/20260218205553.3561-2-michal.wajdeczko@intel.com
---

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
index 888193e1d2c50..e06baf12e1089 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
@@ -1451,8 +1451,7 @@ int xe_gt_sriov_pf_config_set_fair_dbs(struct xe_gt *gt, unsigned int vfid,
 
 static u64 pf_get_lmem_alignment(struct xe_gt *gt)
 {
-	/* this might be platform dependent */
-	return SZ_2M;
+	return xe_lmtt_page_size(&gt->tile->sriov.pf.lmtt);
 }
 
 static u64 pf_get_min_spare_lmem(struct xe_gt *gt)
diff --git a/drivers/gpu/drm/xe/xe_lmtt.c b/drivers/gpu/drm/xe/xe_lmtt.c
index 2077e1ef8b434..b583e0f201837 100644
--- a/drivers/gpu/drm/xe/xe_lmtt.c
+++ b/drivers/gpu/drm/xe/xe_lmtt.c
@@ -57,6 +57,23 @@ static u64 lmtt_page_size(struct xe_lmtt *lmtt)
 	return BIT_ULL(lmtt->ops->lmtt_pte_shift(0));
 }
 
+/**
+ * xe_lmtt_page_size() - Get LMTT page size.
+ * @lmtt: the &xe_lmtt
+ *
+ * This function shall be called only by PF.
+ *
+ * Return: LMTT page size.
+ */
+u64 xe_lmtt_page_size(struct xe_lmtt *lmtt)
+{
+	lmtt_assert(lmtt, IS_SRIOV_PF(lmtt_to_xe(lmtt)));
+	lmtt_assert(lmtt, xe_device_has_lmtt(lmtt_to_xe(lmtt)));
+	lmtt_assert(lmtt, lmtt->ops);
+
+	return lmtt_page_size(lmtt);
+}
+
 static struct xe_lmtt_pt *lmtt_pt_alloc(struct xe_lmtt *lmtt, unsigned int level)
 {
 	unsigned int num_entries = level ? lmtt->ops->lmtt_pte_num(level) : 0;
diff --git a/drivers/gpu/drm/xe/xe_lmtt.h b/drivers/gpu/drm/xe/xe_lmtt.h
index 75a234fbf3670..8fa387b38c520 100644
--- a/drivers/gpu/drm/xe/xe_lmtt.h
+++ b/drivers/gpu/drm/xe/xe_lmtt.h
@@ -20,6 +20,7 @@ int xe_lmtt_prepare_pages(struct xe_lmtt *lmtt, unsigned int vfid, u64 range);
 int xe_lmtt_populate_pages(struct xe_lmtt *lmtt, unsigned int vfid, struct xe_bo *bo, u64 offset);
 void xe_lmtt_drop_pages(struct xe_lmtt *lmtt, unsigned int vfid);
 u64 xe_lmtt_estimate_pt_size(struct xe_lmtt *lmtt, u64 size);
+u64 xe_lmtt_page_size(struct xe_lmtt *lmtt);
 #else
 static inline int xe_lmtt_init(struct xe_lmtt *lmtt) { return 0; }
 static inline void xe_lmtt_init_hw(struct xe_lmtt *lmtt) { }