1 /* SPDX-License-Identifier: MIT */
3 * Copyright © 2020 Intel Corporation
5 * Please try to maintain the following order within this file unless it makes
6 * sense to do otherwise. From top to bottom:
8 * 2. #defines, and macros
9 * 3. structure definitions
10 * 4. function prototypes
12 * Within each section, please try to order by generation in ascending order,
13 * from top to bottom (ie. gen6 on the top, gen8 on the bottom).
16 #ifndef __INTEL_GTT_H__
17 #define __INTEL_GTT_H__
19 #include <linux/io-mapping.h>
20 #include <linux/kref.h>
22 #include <linux/pagevec.h>
23 #include <linux/scatterlist.h>
24 #include <linux/workqueue.h>
26 #include <drm/drm_mm.h>
28 #include "gt/intel_reset.h"
29 #include "i915_selftest.h"
30 #include "i915_vma_resource.h"
31 #include "i915_vma_types.h"
32 #include "i915_params.h"
33 #include "intel_memory_region.h"
35 #define I915_GFP_ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
37 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GTT)
38 #define DBG(...) trace_printk(__VA_ARGS__)
43 #define NALLOC 3 /* 1 normal, 1 for concurrent threads, 1 for preallocation */
45 #define I915_GTT_PAGE_SIZE_4K BIT_ULL(12)
46 #define I915_GTT_PAGE_SIZE_64K BIT_ULL(16)
47 #define I915_GTT_PAGE_SIZE_2M BIT_ULL(21)
49 #define I915_GTT_PAGE_SIZE I915_GTT_PAGE_SIZE_4K
50 #define I915_GTT_MAX_PAGE_SIZE I915_GTT_PAGE_SIZE_2M
52 #define I915_GTT_PAGE_MASK -I915_GTT_PAGE_SIZE
54 #define I915_GTT_MIN_ALIGNMENT I915_GTT_PAGE_SIZE
56 #define I915_FENCE_REG_NONE -1
57 #define I915_MAX_NUM_FENCES 32
58 /* 32 fences + sign bit for FENCE_REG_NONE */
59 #define I915_MAX_NUM_FENCE_BITS 6
61 typedef u32 gen6_pte_t;
62 typedef u64 gen8_pte_t;
64 #define ggtt_total_entries(ggtt) ((ggtt)->vm.total >> PAGE_SHIFT)
66 #define I915_PTES(pte_len) ((unsigned int)(PAGE_SIZE / (pte_len)))
67 #define I915_PTE_MASK(pte_len) (I915_PTES(pte_len) - 1)
69 #define I915_PDE_MASK (I915_PDES - 1)
71 /* gen6-hsw has bit 11-4 for physical addr bit 39-32 */
72 #define GEN6_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0xff0))
73 #define GEN6_PTE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr)
74 #define GEN6_PDE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr)
75 #define GEN6_PTE_CACHE_LLC (2 << 1)
76 #define GEN6_PTE_UNCACHED (1 << 1)
77 #define GEN6_PTE_VALID REG_BIT(0)
79 #define GEN6_PTES I915_PTES(sizeof(gen6_pte_t))
80 #define GEN6_PD_SIZE (I915_PDES * PAGE_SIZE)
81 #define GEN6_PD_ALIGN (PAGE_SIZE * 16)
82 #define GEN6_PDE_SHIFT 22
83 #define GEN6_PDE_VALID REG_BIT(0)
84 #define NUM_PTE(pde_shift) (1 << (pde_shift - PAGE_SHIFT))
86 #define GEN7_PTE_CACHE_L3_LLC (3 << 1)
88 #define BYT_PTE_SNOOPED_BY_CPU_CACHES REG_BIT(2)
89 #define BYT_PTE_WRITEABLE REG_BIT(1)
91 #define GEN12_PPGTT_PTE_LM BIT_ULL(11)
93 #define GEN12_GGTT_PTE_LM BIT_ULL(1)
95 #define GEN12_PDE_64K BIT(6)
96 #define GEN12_PTE_PS64 BIT(8)
99 * Cacheability Control is a 4-bit value. The low three bits are stored in bits
100 * 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE.
102 #define HSW_CACHEABILITY_CONTROL(bits) ((((bits) & 0x7) << 1) | \
103 (((bits) & 0x8) << (11 - 3)))
104 #define HSW_WB_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x2)
105 #define HSW_WB_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0x3)
106 #define HSW_WB_ELLC_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x8)
107 #define HSW_WB_ELLC_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0xb)
108 #define HSW_WT_ELLC_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x7)
109 #define HSW_WT_ELLC_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0x6)
110 #define HSW_PTE_UNCACHED (0)
111 #define HSW_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0x7f0))
112 #define HSW_PTE_ADDR_ENCODE(addr) HSW_GTT_ADDR_ENCODE(addr)
115 * GEN8 32b style address is defined as a 3 level page table:
116 * 31:30 | 29:21 | 20:12 | 11:0
117 * PDPE | PDE | PTE | offset
118 * The difference as compared to normal x86 3 level page table is the PDPEs are
119 * programmed via register.
121 * GEN8 48b style address is defined as a 4 level page table:
122 * 47:39 | 38:30 | 29:21 | 20:12 | 11:0
123 * PML4E | PDPE | PDE | PTE | offset
125 #define GEN8_3LVL_PDPES 4
127 #define PPAT_UNCACHED (_PAGE_PWT | _PAGE_PCD)
128 #define PPAT_CACHED_PDE 0 /* WB LLC */
129 #define PPAT_CACHED _PAGE_PAT /* WB LLCeLLC */
130 #define PPAT_DISPLAY_ELLC _PAGE_PCD /* WT eLLC */
132 #define CHV_PPAT_SNOOP REG_BIT(6)
133 #define GEN8_PPAT_AGE(x) ((x)<<4)
134 #define GEN8_PPAT_LLCeLLC (3<<2)
135 #define GEN8_PPAT_LLCELLC (2<<2)
136 #define GEN8_PPAT_LLC (1<<2)
137 #define GEN8_PPAT_WB (3<<0)
138 #define GEN8_PPAT_WT (2<<0)
139 #define GEN8_PPAT_WC (1<<0)
140 #define GEN8_PPAT_UC (0<<0)
141 #define GEN8_PPAT_ELLC_OVERRIDE (0<<2)
142 #define GEN8_PPAT(i, x) ((u64)(x) << ((i) * 8))
144 #define GEN8_PAGE_PRESENT BIT_ULL(0)
145 #define GEN8_PAGE_RW BIT_ULL(1)
147 #define GEN8_PDE_IPS_64K BIT(11)
148 #define GEN8_PDE_PS_2M BIT(7)
150 enum i915_cache_level;
152 struct drm_i915_gem_object;
153 struct i915_fence_reg;
157 #define for_each_sgt_daddr(__dp, __iter, __sgt) \
158 __for_each_sgt_daddr(__dp, __iter, __sgt, I915_GTT_PAGE_SIZE)
160 struct i915_page_table {
161 struct drm_i915_gem_object *base;
164 struct i915_page_table *stash;
169 struct i915_page_directory {
170 struct i915_page_table pt;
175 #define __px_choose_expr(x, type, expr, other) \
176 __builtin_choose_expr( \
177 __builtin_types_compatible_p(typeof(x), type) || \
178 __builtin_types_compatible_p(typeof(x), const type), \
179 ({ type __x = (type)(x); expr; }), \
182 #define px_base(px) \
183 __px_choose_expr(px, struct drm_i915_gem_object *, __x, \
184 __px_choose_expr(px, struct i915_page_table *, __x->base, \
185 __px_choose_expr(px, struct i915_page_directory *, __x->pt.base, \
188 struct page *__px_page(struct drm_i915_gem_object *p);
189 dma_addr_t __px_dma(struct drm_i915_gem_object *p);
190 #define px_dma(px) (__px_dma(px_base(px)))
192 void *__px_vaddr(struct drm_i915_gem_object *p);
193 #define px_vaddr(px) (__px_vaddr(px_base(px)))
196 __px_choose_expr(px, struct i915_page_table *, __x, \
197 __px_choose_expr(px, struct i915_page_directory *, &__x->pt, \
199 #define px_used(px) (&px_pt(px)->used)
201 struct i915_vm_pt_stash {
202 /* preallocated chains of page tables/directories */
203 struct i915_page_table *pt[2];
205 * Optionally override the alignment/size of the physical page that
206 * contains each PT. If not set defaults back to the usual
207 * I915_GTT_PAGE_SIZE_4K. This does not influence the other paging
208 * structures. MUST be a power-of-two. ONLY applicable on discrete
214 struct i915_vma_ops {
215 /* Map an object into an address space with the given cache flags. */
216 void (*bind_vma)(struct i915_address_space *vm,
217 struct i915_vm_pt_stash *stash,
218 struct i915_vma_resource *vma_res,
219 enum i915_cache_level cache_level,
222 * Unmap an object from an address space. This usually consists of
223 * setting the valid PTE entries to a reserved scratch page.
225 void (*unbind_vma)(struct i915_address_space *vm,
226 struct i915_vma_resource *vma_res);
230 struct i915_address_space {
232 struct work_struct release_work;
236 struct drm_i915_private *i915;
238 u64 total; /* size addr space maps (ex. 2GB for ggtt) */
239 u64 reserved; /* size addr space reserved */
240 u64 min_alignment[INTEL_MEMORY_STOLEN_LOCAL + 1];
242 unsigned int bind_async_flags;
244 struct mutex mutex; /* protects vma and our lists */
246 struct kref resv_ref; /* kref to keep the reservation lock alive. */
247 struct dma_resv _resv; /* reservation lock for all pd objects, and buffer pool */
248 #define VM_CLASS_GGTT 0
249 #define VM_CLASS_PPGTT 1
250 #define VM_CLASS_DPT 2
252 struct drm_i915_gem_object *scratch[4];
254 * List of vma currently bound.
256 struct list_head bound_list;
259 * List of vmas not yet bound or evicted.
261 struct list_head unbound_list;
266 /* Display page table */
269 /* Some systems support read-only mappings for GGTT and/or PPGTT */
270 bool has_read_only:1;
272 /* Skip pte rewrite on unbind for suspend. Protected by @mutex */
273 bool skip_pte_rewrite:1;
279 /* Flags used when creating page-table objects for this vm */
280 unsigned long lmem_pt_obj_flags;
282 /* Interval tree for pending unbind vma resources */
283 struct rb_root_cached pending_unbind;
285 struct drm_i915_gem_object *
286 (*alloc_pt_dma)(struct i915_address_space *vm, int sz);
287 struct drm_i915_gem_object *
288 (*alloc_scratch_dma)(struct i915_address_space *vm, int sz);
290 u64 (*pte_encode)(dma_addr_t addr,
291 enum i915_cache_level level,
292 u32 flags); /* Create a valid PTE */
293 #define PTE_READ_ONLY BIT(0)
294 #define PTE_LM BIT(1)
296 void (*allocate_va_range)(struct i915_address_space *vm,
297 struct i915_vm_pt_stash *stash,
298 u64 start, u64 length);
299 void (*clear_range)(struct i915_address_space *vm,
300 u64 start, u64 length);
301 void (*scratch_range)(struct i915_address_space *vm,
302 u64 start, u64 length);
303 void (*insert_page)(struct i915_address_space *vm,
306 enum i915_cache_level cache_level,
308 void (*insert_entries)(struct i915_address_space *vm,
309 struct i915_vma_resource *vma_res,
310 enum i915_cache_level cache_level,
312 void (*raw_insert_page)(struct i915_address_space *vm,
315 enum i915_cache_level cache_level,
317 void (*raw_insert_entries)(struct i915_address_space *vm,
318 struct i915_vma_resource *vma_res,
319 enum i915_cache_level cache_level,
321 void (*cleanup)(struct i915_address_space *vm);
323 void (*foreach)(struct i915_address_space *vm,
324 u64 start, u64 length,
325 void (*fn)(struct i915_address_space *vm,
326 struct i915_page_table *pt,
330 struct i915_vma_ops vma_ops;
332 I915_SELFTEST_DECLARE(struct fault_attr fault_attr);
333 I915_SELFTEST_DECLARE(bool scrub_64K);
337 * The Graphics Translation Table is the way in which GEN hardware translates a
338 * Graphics Virtual Address into a Physical Address. In addition to the normal
339 * collateral associated with any va->pa translations GEN hardware also has a
340 * portion of the GTT which can be mapped by the CPU and remain both coherent
341 * and correct (in cases like swizzling). That region is referred to as GMADR in
345 struct i915_address_space vm;
347 struct io_mapping iomap; /* Mapping to our CPU mappable region */
348 struct resource gmadr; /* GMADR resource */
349 resource_size_t mappable_end; /* End offset that we can CPU map */
351 /** "Graphics Stolen Memory" holds the global PTEs */
353 void (*invalidate)(struct i915_ggtt *ggtt);
355 /** PPGTT used for aliasing the PPGTT with the GTT */
356 struct i915_ppgtt *alias;
362 /** Bit 6 swizzling required for X tiling */
364 /** Bit 6 swizzling required for Y tiling */
369 unsigned int num_fences;
370 struct i915_fence_reg *fence_regs;
371 struct list_head fence_list;
374 * List of all objects in gtt_space, currently mmaped by userspace.
375 * All objects within this list must also be on bound_list.
377 struct list_head userfault_list;
379 struct mutex error_mutex;
380 struct drm_mm_node error_capture;
381 struct drm_mm_node uc_fw;
383 /** List of GTs mapping this GGTT */
384 struct list_head gt_list;
388 struct i915_address_space vm;
390 struct i915_page_directory *pd;
393 #define i915_is_ggtt(vm) ((vm)->is_ggtt)
394 #define i915_is_dpt(vm) ((vm)->is_dpt)
395 #define i915_is_ggtt_or_dpt(vm) (i915_is_ggtt(vm) || i915_is_dpt(vm))
397 bool intel_vm_no_concurrent_access_wa(struct drm_i915_private *i915);
400 i915_vm_lock_objects(struct i915_address_space *vm, struct i915_gem_ww_ctx *ww);
403 i915_vm_is_4lvl(const struct i915_address_space *vm)
405 return (vm->total - 1) >> 32;
409 i915_vm_has_scratch_64K(struct i915_address_space *vm)
411 return vm->scratch_order == get_order(I915_GTT_PAGE_SIZE_64K);
414 static inline u64 i915_vm_min_alignment(struct i915_address_space *vm,
415 enum intel_memory_type type)
417 /* avoid INTEL_MEMORY_MOCK overflow */
418 if ((int)type >= ARRAY_SIZE(vm->min_alignment))
419 type = INTEL_MEMORY_SYSTEM;
421 return vm->min_alignment[type];
424 static inline u64 i915_vm_obj_min_alignment(struct i915_address_space *vm,
425 struct drm_i915_gem_object *obj)
427 struct intel_memory_region *mr = READ_ONCE(obj->mm.region);
428 enum intel_memory_type type = mr ? mr->type : INTEL_MEMORY_SYSTEM;
430 return i915_vm_min_alignment(vm, type);
434 i915_vm_has_cache_coloring(struct i915_address_space *vm)
436 return i915_is_ggtt(vm) && vm->mm.color_adjust;
439 static inline struct i915_ggtt *
440 i915_vm_to_ggtt(struct i915_address_space *vm)
442 BUILD_BUG_ON(offsetof(struct i915_ggtt, vm));
443 GEM_BUG_ON(!i915_is_ggtt(vm));
444 return container_of(vm, struct i915_ggtt, vm);
447 static inline struct i915_ppgtt *
448 i915_vm_to_ppgtt(struct i915_address_space *vm)
450 BUILD_BUG_ON(offsetof(struct i915_ppgtt, vm));
451 GEM_BUG_ON(i915_is_ggtt_or_dpt(vm));
452 return container_of(vm, struct i915_ppgtt, vm);
455 static inline struct i915_address_space *
456 i915_vm_get(struct i915_address_space *vm)
462 static inline struct i915_address_space *
463 i915_vm_tryget(struct i915_address_space *vm)
465 return kref_get_unless_zero(&vm->ref) ? vm : NULL;
468 static inline void assert_vm_alive(struct i915_address_space *vm)
470 GEM_BUG_ON(!kref_read(&vm->ref));
474 * i915_vm_resv_get - Obtain a reference on the vm's reservation lock
475 * @vm: The vm whose reservation lock we want to share.
477 * Return: A pointer to the vm's reservation lock.
479 static inline struct dma_resv *i915_vm_resv_get(struct i915_address_space *vm)
481 kref_get(&vm->resv_ref);
485 void i915_vm_release(struct kref *kref);
487 void i915_vm_resv_release(struct kref *kref);
489 static inline void i915_vm_put(struct i915_address_space *vm)
491 kref_put(&vm->ref, i915_vm_release);
495 * i915_vm_resv_put - Release a reference on the vm's reservation lock
496 * @resv: Pointer to a reservation lock obtained from i915_vm_resv_get()
498 static inline void i915_vm_resv_put(struct i915_address_space *vm)
500 kref_put(&vm->resv_ref, i915_vm_resv_release);
503 void i915_address_space_init(struct i915_address_space *vm, int subclass);
504 void i915_address_space_fini(struct i915_address_space *vm);
506 static inline u32 i915_pte_index(u64 address, unsigned int pde_shift)
508 const u32 mask = NUM_PTE(pde_shift) - 1;
510 return (address >> PAGE_SHIFT) & mask;
514 * Helper to counts the number of PTEs within the given length. This count
515 * does not cross a page table boundary, so the max value would be
516 * GEN6_PTES for GEN6, and GEN8_PTES for GEN8.
518 static inline u32 i915_pte_count(u64 addr, u64 length, unsigned int pde_shift)
520 const u64 mask = ~((1ULL << pde_shift) - 1);
523 GEM_BUG_ON(length == 0);
524 GEM_BUG_ON(offset_in_page(addr | length));
528 if ((addr & mask) != (end & mask))
529 return NUM_PTE(pde_shift) - i915_pte_index(addr, pde_shift);
531 return i915_pte_index(end, pde_shift) - i915_pte_index(addr, pde_shift);
534 static inline u32 i915_pde_index(u64 addr, u32 shift)
536 return (addr >> shift) & I915_PDE_MASK;
539 static inline struct i915_page_table *
540 i915_pt_entry(const struct i915_page_directory * const pd,
541 const unsigned short n)
546 static inline struct i915_page_directory *
547 i915_pd_entry(const struct i915_page_directory * const pdp,
548 const unsigned short n)
550 return pdp->entry[n];
553 static inline dma_addr_t
554 i915_page_dir_dma_addr(const struct i915_ppgtt *ppgtt, const unsigned int n)
556 struct i915_page_table *pt = ppgtt->pd->entry[n];
558 return __px_dma(pt ? px_base(pt) : ppgtt->vm.scratch[ppgtt->vm.top]);
561 void ppgtt_init(struct i915_ppgtt *ppgtt, struct intel_gt *gt,
562 unsigned long lmem_pt_obj_flags);
563 void intel_ggtt_bind_vma(struct i915_address_space *vm,
564 struct i915_vm_pt_stash *stash,
565 struct i915_vma_resource *vma_res,
566 enum i915_cache_level cache_level,
568 void intel_ggtt_unbind_vma(struct i915_address_space *vm,
569 struct i915_vma_resource *vma_res);
571 int i915_ggtt_probe_hw(struct drm_i915_private *i915);
572 int i915_ggtt_init_hw(struct drm_i915_private *i915);
573 int i915_ggtt_enable_hw(struct drm_i915_private *i915);
574 int i915_init_ggtt(struct drm_i915_private *i915);
575 void i915_ggtt_driver_release(struct drm_i915_private *i915);
576 void i915_ggtt_driver_late_release(struct drm_i915_private *i915);
577 struct i915_ggtt *i915_ggtt_create(struct drm_i915_private *i915);
579 static inline bool i915_ggtt_has_aperture(const struct i915_ggtt *ggtt)
581 return ggtt->mappable_end > 0;
584 int i915_ppgtt_init_hw(struct intel_gt *gt);
586 struct i915_ppgtt *i915_ppgtt_create(struct intel_gt *gt,
587 unsigned long lmem_pt_obj_flags);
589 void i915_ggtt_suspend_vm(struct i915_address_space *vm);
590 bool i915_ggtt_resume_vm(struct i915_address_space *vm);
591 void i915_ggtt_suspend(struct i915_ggtt *gtt);
592 void i915_ggtt_resume(struct i915_ggtt *ggtt);
595 fill_page_dma(struct drm_i915_gem_object *p, const u64 val, unsigned int count);
597 #define fill_px(px, v) fill_page_dma(px_base(px), (v), PAGE_SIZE / sizeof(u64))
598 #define fill32_px(px, v) do { \
599 u64 v__ = lower_32_bits(v); \
600 fill_px((px), v__ << 32 | v__); \
603 int setup_scratch_page(struct i915_address_space *vm);
604 void free_scratch(struct i915_address_space *vm);
606 struct drm_i915_gem_object *alloc_pt_dma(struct i915_address_space *vm, int sz);
607 struct drm_i915_gem_object *alloc_pt_lmem(struct i915_address_space *vm, int sz);
608 struct i915_page_table *alloc_pt(struct i915_address_space *vm, int sz);
609 struct i915_page_directory *alloc_pd(struct i915_address_space *vm);
610 struct i915_page_directory *__alloc_pd(int npde);
612 int map_pt_dma(struct i915_address_space *vm, struct drm_i915_gem_object *obj);
613 int map_pt_dma_locked(struct i915_address_space *vm, struct drm_i915_gem_object *obj);
615 void free_px(struct i915_address_space *vm,
616 struct i915_page_table *pt, int lvl);
617 #define free_pt(vm, px) free_px(vm, px, 0)
618 #define free_pd(vm, px) free_px(vm, px_pt(px), 1)
621 __set_pd_entry(struct i915_page_directory * const pd,
622 const unsigned short idx,
623 struct i915_page_table *pt,
624 u64 (*encode)(const dma_addr_t, const enum i915_cache_level));
626 #define set_pd_entry(pd, idx, to) \
627 __set_pd_entry((pd), (idx), px_pt(to), gen8_pde_encode)
630 clear_pd_entry(struct i915_page_directory * const pd,
631 const unsigned short idx,
632 const struct drm_i915_gem_object * const scratch);
635 release_pd_entry(struct i915_page_directory * const pd,
636 const unsigned short idx,
637 struct i915_page_table * const pt,
638 const struct drm_i915_gem_object * const scratch);
639 void gen6_ggtt_invalidate(struct i915_ggtt *ggtt);
641 void ppgtt_bind_vma(struct i915_address_space *vm,
642 struct i915_vm_pt_stash *stash,
643 struct i915_vma_resource *vma_res,
644 enum i915_cache_level cache_level,
646 void ppgtt_unbind_vma(struct i915_address_space *vm,
647 struct i915_vma_resource *vma_res);
649 void gtt_write_workarounds(struct intel_gt *gt);
651 void setup_private_pat(struct intel_gt *gt);
653 int i915_vm_alloc_pt_stash(struct i915_address_space *vm,
654 struct i915_vm_pt_stash *stash,
656 int i915_vm_map_pt_stash(struct i915_address_space *vm,
657 struct i915_vm_pt_stash *stash);
658 void i915_vm_free_pt_stash(struct i915_address_space *vm,
659 struct i915_vm_pt_stash *stash);
662 __vm_create_scratch_for_read(struct i915_address_space *vm, unsigned long size);
665 __vm_create_scratch_for_read_pinned(struct i915_address_space *vm, unsigned long size);
667 static inline struct sgt_dma {
668 struct scatterlist *sg;
670 } sgt_dma(struct i915_vma_resource *vma_res) {
671 struct scatterlist *sg = vma_res->bi.pages->sgl;
672 dma_addr_t addr = sg_dma_address(sg);
674 return (struct sgt_dma){ sg, addr, addr + sg_dma_len(sg) };