drm/i915/migrate: Account for the reserved_space

From Chris Wilson
6e6d577cd90b27a98ce9f06ed96bca7b59d210f0 in linux-6.1.y/6.1.4
31a2e6cbe8a4eb0d1650fff4b77872b744e14a62 in mainline linux

1 files changed, 12 insertions, 4 deletions

diff --git a/sys/dev/pci/drm/i915/gt/intel_migrate.c b/sys/dev/pci/drm/i915/gt/intel_migrate.c
index aaaf1906026..ee072c7d62e 100644
--- a/sys/dev/pci/drm/i915/gt/intel_migrate.c
+++ b/sys/dev/pci/drm/i915/gt/intel_migrate.c
@@ -341,6 +341,16 @@ static int emit_no_arbitration(struct i915_request *rq)
 	return 0;
 }
 
+static int max_pte_pkt_size(struct i915_request *rq, int pkt)
+{
+	struct intel_ring *ring = rq->ring;
+
+	pkt = min_t(int, pkt, (ring->space - rq->reserved_space) / sizeof(u32) + 5);
+	pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5);
+
+	return pkt;
+}
+
 static int emit_pte(struct i915_request *rq,
 		    struct sgt_dma *it,
 		    enum i915_cache_level cache_level,
@@ -387,8 +397,7 @@ static int emit_pte(struct i915_request *rq,
 		return PTR_ERR(cs);
 
 	/* Pack as many PTE updates as possible into a single MI command */
-	pkt = min_t(int, dword_length, ring->space / sizeof(u32) + 5);
-	pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5);
+	pkt = max_pte_pkt_size(rq, dword_length);
 
 	hdr = cs;
 	*cs++ = MI_STORE_DATA_IMM | REG_BIT(21); /* as qword elements */
@@ -421,8 +430,7 @@ static int emit_pte(struct i915_request *rq,
 				}
 			}
 
-			pkt = min_t(int, dword_rem, ring->space / sizeof(u32) + 5);
-			pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5);
+			pkt = max_pte_pkt_size(rq, dword_rem);
 
 			hdr = cs;
 			*cs++ = MI_STORE_DATA_IMM | REG_BIT(21);