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      1 /*	$NetBSD: gen6_ppgtt.h,v 1.4 2021/12/19 01:50:47 riastradh Exp $	*/
      2 
      3 /* SPDX-License-Identifier: MIT */
      4 /*
      5  * Copyright  2020 Intel Corporation
      6  */
      7 
      8 #ifndef __GEN6_PPGTT_H__
      9 #define __GEN6_PPGTT_H__
     10 
     11 #include "intel_gtt.h"
     12 
     13 struct gen6_ppgtt {
     14 	struct i915_ppgtt base;
     15 
     16 	struct mutex flush;
     17 	struct i915_vma *vma;
     18 #ifdef __NetBSD__
     19 	bus_space_tag_t pd_bst;
     20 	bus_space_handle_t pd_bsh;
     21 #else
     22 	gen6_pte_t __iomem *pd_addr;
     23 #endif
     24 
     25 	atomic_t pin_count;
     26 	struct mutex pin_mutex;
     27 
     28 	bool scan_for_unused_pt;
     29 };
     30 
     31 static inline u32 gen6_pte_index(u32 addr)
     32 {
     33 	return i915_pte_index(addr, GEN6_PDE_SHIFT);
     34 }
     35 
     36 static inline u32 gen6_pte_count(u32 addr, u32 length)
     37 {
     38 	return i915_pte_count(addr, length, GEN6_PDE_SHIFT);
     39 }
     40 
     41 static inline u32 gen6_pde_index(u32 addr)
     42 {
     43 	return i915_pde_index(addr, GEN6_PDE_SHIFT);
     44 }
     45 
     46 #define __to_gen6_ppgtt(base) container_of(base, struct gen6_ppgtt, base)
     47 
     48 static inline struct gen6_ppgtt *to_gen6_ppgtt(struct i915_ppgtt *base)
     49 {
     50 	BUILD_BUG_ON(offsetof(struct gen6_ppgtt, base));
     51 	return __to_gen6_ppgtt(base);
     52 }
     53 
     54 /*
     55  * gen6_for_each_pde() iterates over every pde from start until start+length.
     56  * If start and start+length are not perfectly divisible, the macro will round
     57  * down and up as needed. Start=0 and length=2G effectively iterates over
     58  * every PDE in the system. The macro modifies ALL its parameters except 'pd',
     59  * so each of the other parameters should preferably be a simple variable, or
     60  * at most an lvalue with no side-effects!
     61  */
     62 #define gen6_for_each_pde(pt, pd, start, length, iter)			\
     63 	for (iter = gen6_pde_index(start);				\
     64 	     length > 0 && iter < I915_PDES &&				\
     65 		     (pt = i915_pt_entry(pd, iter), true);		\
     66 	     ({ u32 temp = round_up(start+1, 1 << GEN6_PDE_SHIFT);	\
     67 		    temp = min(temp - start, length);			\
     68 		    start += temp, length -= temp; }), ++iter)
     69 
     70 #define gen6_for_all_pdes(pt, pd, iter)					\
     71 	for (iter = 0;							\
     72 	     iter < I915_PDES &&					\
     73 		     (pt = i915_pt_entry(pd, iter), true);		\
     74 	     ++iter)
     75 
     76 int gen6_ppgtt_pin(struct i915_ppgtt *base);
     77 void gen6_ppgtt_unpin(struct i915_ppgtt *base);
     78 void gen6_ppgtt_unpin_all(struct i915_ppgtt *base);
     79 void gen6_ppgtt_enable(struct intel_gt *gt);
     80 void gen7_ppgtt_enable(struct intel_gt *gt);
     81 struct i915_ppgtt *gen6_ppgtt_create(struct intel_gt *gt);
     82 
     83 #endif
     84