drm/i915: Remove bitmap tracking for used-ptes

We only operate on known extents (both for alloc/clear) and so we can use
both the knowledge of the bind/unbind range along with the knowledge of
the existing pagetable to avoid having to allocate temporary and
auxiliary bitmaps.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99295Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170215084357.19977-12-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -69,7 +69,7 @@ typedef uint64_t gen8_ppgtt_pml4e_t;
 #define GEN6_PTE_UNCACHED		(1 << 1)
 #define GEN6_PTE_VALID			(1 << 0)
 
-#define I915_PTES(pte_len)		(PAGE_SIZE / (pte_len))
+#define I915_PTES(pte_len)		((unsigned int)(PAGE_SIZE / (pte_len)))
 #define I915_PTE_MASK(pte_len)		(I915_PTES(pte_len) - 1)
 #define I915_PDES			512
 #define I915_PDE_MASK			(I915_PDES - 1)
@@ -220,8 +220,7 @@ struct i915_page_dma {
 
 struct i915_page_table {
 	struct i915_page_dma base;
-
-	unsigned long *used_ptes;
+	unsigned int used_ptes;
 };
 
 struct i915_page_directory {

drivers/gpu/drm/i915/i915_trace.h

@@ -245,15 +245,14 @@ DEFINE_EVENT_PRINT(i915_px_entry, i915_page_directory_pointer_entry_alloc,
 
 DECLARE_EVENT_CLASS(i915_page_table_entry_update,
 	TP_PROTO(struct i915_address_space *vm, u32 pde,
-		 struct i915_page_table *pt, u32 first, u32 count, u32 bits),
-	TP_ARGS(vm, pde, pt, first, count, bits),
+		 struct i915_page_table *pt, u32 first, u32 count),
+	TP_ARGS(vm, pde, pt, first, count),
 
 	TP_STRUCT__entry(
 		__field(struct i915_address_space *, vm)
 		__field(u32, pde)
 		__field(u32, first)
 		__field(u32, last)
-		__dynamic_array(char, cur_ptes, TRACE_PT_SIZE(bits))
 	),
 
 	TP_fast_assign(
@@ -261,22 +260,16 @@ DECLARE_EVENT_CLASS(i915_page_table_entry_update,
 		__entry->pde = pde;
 		__entry->first = first;
 		__entry->last = first + count - 1;
-		scnprintf(__get_str(cur_ptes),
-			  TRACE_PT_SIZE(bits),
-			  "%*pb",
-			  bits,
-			  pt->used_ptes);
 	),
 
-	TP_printk("vm=%p, pde=%d, updating %u:%u\t%s",
-		  __entry->vm, __entry->pde, __entry->last, __entry->first,
-		  __get_str(cur_ptes))
+	TP_printk("vm=%p, pde=%d, updating %u:%u",
+		  __entry->vm, __entry->pde, __entry->last, __entry->first)
 );
 
 DEFINE_EVENT(i915_page_table_entry_update, i915_page_table_entry_map,
 	TP_PROTO(struct i915_address_space *vm, u32 pde,
-		 struct i915_page_table *pt, u32 first, u32 count, u32 bits),
-	TP_ARGS(vm, pde, pt, first, count, bits)
+		 struct i915_page_table *pt, u32 first, u32 count),
+	TP_ARGS(vm, pde, pt, first, count)
 );
 
 TRACE_EVENT(i915_gem_object_change_domain,