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gen6_ppgtt.h revision 1.1.1.1 
      1 /*	$NetBSD: gen6_ppgtt.h,v 1.1.1.1 2021/12/18 20:15:32 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 	gen6_pte_t __iomem *pd_addr;
     19 
     20 	atomic_t pin_count;
     21 	struct mutex pin_mutex;
     22 
     23 	bool scan_for_unused_pt;
     24 };
     25 
     26 static inline u32 gen6_pte_index(u32 addr)
     27 {
     28 	return i915_pte_index(addr, GEN6_PDE_SHIFT);
     29 }
     30 
     31 static inline u32 gen6_pte_count(u32 addr, u32 length)
     32 {
     33 	return i915_pte_count(addr, length, GEN6_PDE_SHIFT);
     34 }
     35 
     36 static inline u32 gen6_pde_index(u32 addr)
     37 {
     38 	return i915_pde_index(addr, GEN6_PDE_SHIFT);
     39 }
     40 
     41 #define __to_gen6_ppgtt(base) container_of(base, struct gen6_ppgtt, base)
     42 
     43 static inline struct gen6_ppgtt *to_gen6_ppgtt(struct i915_ppgtt *base)
     44 {
     45 	BUILD_BUG_ON(offsetof(struct gen6_ppgtt, base));
     46 	return __to_gen6_ppgtt(base);
     47 }
     48 
     49 /*
     50  * gen6_for_each_pde() iterates over every pde from start until start+length.
     51  * If start and start+length are not perfectly divisible, the macro will round
     52  * down and up as needed. Start=0 and length=2G effectively iterates over
     53  * every PDE in the system. The macro modifies ALL its parameters except 'pd',
     54  * so each of the other parameters should preferably be a simple variable, or
     55  * at most an lvalue with no side-effects!
     56  */
     57 #define gen6_for_each_pde(pt, pd, start, length, iter)			\
     58 	for (iter = gen6_pde_index(start);				\
     59 	     length > 0 && iter < I915_PDES &&				\
     60 		     (pt = i915_pt_entry(pd, iter), true);		\
     61 	     ({ u32 temp = ALIGN(start+1, 1 << GEN6_PDE_SHIFT);		\
     62 		    temp = min(temp - start, length);			\
     63 		    start += temp, length -= temp; }), ++iter)
     64 
     65 #define gen6_for_all_pdes(pt, pd, iter)					\
     66 	for (iter = 0;							\
     67 	     iter < I915_PDES &&					\
     68 		     (pt = i915_pt_entry(pd, iter), true);		\
     69 	     ++iter)
     70 
     71 int gen6_ppgtt_pin(struct i915_ppgtt *base);
     72 void gen6_ppgtt_unpin(struct i915_ppgtt *base);
     73 void gen6_ppgtt_unpin_all(struct i915_ppgtt *base);
     74 void gen6_ppgtt_enable(struct intel_gt *gt);
     75 void gen7_ppgtt_enable(struct intel_gt *gt);
     76 struct i915_ppgtt *gen6_ppgtt_create(struct intel_gt *gt);
     77 
     78 #endif
     79