[PATCH v2 01/12] drm/xe: Add normalize_invalidation_range

[Matthew Brost <matthew.brost@intel.com>]

Extract the code that determines the alignment of TLB invalidation into
a helper function — normalize_invalidation_range. This will be useful
when adding context-based invalidations to the GuC TLB invalidation
backend.

Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_tlb_inval.c | 71 +++++++++++++--------------
 1 file changed, 35 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_tlb_inval.c b/drivers/gpu/drm/xe/xe_guc_tlb_inval.c
index a80175c7c478..61bfa0d485f6 100644
--- a/drivers/gpu/drm/xe/xe_guc_tlb_inval.c
+++ b/drivers/gpu/drm/xe/xe_guc_tlb_inval.c
@@ -92,6 +92,38 @@ static int send_tlb_inval_ggtt(struct xe_tlb_inval *tlb_inval, u32 seqno)
 	return -ECANCELED;
 }
 
+static u64 normalize_invalidation_range(struct xe_gt *gt, u64 *start, u64 *end)
+{
+	u64 orig_start = *start;
+	u64 length = *end - *start;
+	u64 align;
+
+	if (length < SZ_4K)
+		length = SZ_4K;
+
+	align = roundup_pow_of_two(length);
+	*start = ALIGN_DOWN(*start, align);
+	*end = ALIGN(*end, align);
+	length = align;
+	while (*start + length < *end) {
+		length <<= 1;
+		*start = ALIGN_DOWN(orig_start, length);
+	}
+
+	if (length >= SZ_2M) {
+		length = max_t(u64, SZ_16M, length);
+		*start = ALIGN_DOWN(orig_start, length);
+	}
+
+	xe_gt_assert(gt, length >= SZ_4K);
+	xe_gt_assert(gt, is_power_of_2(length));
+	xe_gt_assert(gt, !(length & GENMASK(ilog2(SZ_16M) - 1,
+					    ilog2(SZ_2M) + 1)));
+	xe_gt_assert(gt, IS_ALIGNED(*start, length));
+
+	return length;
+}
+
 /*
  * Ensure that roundup_pow_of_two(length) doesn't overflow.
  * Note that roundup_pow_of_two() operates on unsigned long,
@@ -118,47 +150,14 @@ static int send_tlb_inval_ppgtt(struct xe_tlb_inval *tlb_inval, u32 seqno,
 	    length > MAX_RANGE_TLB_INVALIDATION_LENGTH) {
 		action[len++] = MAKE_INVAL_OP(XE_GUC_TLB_INVAL_FULL);
 	} else {
-		u64 orig_start = start;
-		u64 align;
-
-		if (length < SZ_4K)
-			length = SZ_4K;
-
-		/*
-		 * We need to invalidate a higher granularity if start address
-		 * is not aligned to length. When start is not aligned with
-		 * length we need to find the length large enough to create an
-		 * address mask covering the required range.
-		 */
-		align = roundup_pow_of_two(length);
-		start = ALIGN_DOWN(start, align);
-		end = ALIGN(end, align);
-		length = align;
-		while (start + length < end) {
-			length <<= 1;
-			start = ALIGN_DOWN(orig_start, length);
-		}
-
-		/*
-		 * Minimum invalidation size for a 2MB page that the hardware
-		 * expects is 16MB
-		 */
-		if (length >= SZ_2M) {
-			length = max_t(u64, SZ_16M, length);
-			start = ALIGN_DOWN(orig_start, length);
-		}
-
-		xe_gt_assert(gt, length >= SZ_4K);
-		xe_gt_assert(gt, is_power_of_2(length));
-		xe_gt_assert(gt, !(length & GENMASK(ilog2(SZ_16M) - 1,
-						    ilog2(SZ_2M) + 1)));
-		xe_gt_assert(gt, IS_ALIGNED(start, length));
+		u64 normalize_len = normalize_invalidation_range(gt, &start,
+								 &end);
 
 		action[len++] = MAKE_INVAL_OP(XE_GUC_TLB_INVAL_PAGE_SELECTIVE);
 		action[len++] = asid;
 		action[len++] = lower_32_bits(start);
 		action[len++] = upper_32_bits(start);
-		action[len++] = ilog2(length) - ilog2(SZ_4K);
+		action[len++] = ilog2(normalize_len) - ilog2(SZ_4K);
 	}
 
 	xe_gt_assert(gt, len <= MAX_TLB_INVALIDATION_LEN);
-- 
2.34.1