kernel/drivers/gpu/drm/gma500/mmu.h

   1 /**************************************************************************
   2  * Copyright (c) 2007-2011, Intel Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  **************************************************************************/
  14
  15 #ifndef __MMU_H
  16 #define __MMU_H
  17
  18 struct psb_mmu_driver {
  19         /* protects driver- and pd structures. Always take in read mode
  20          * before taking the page table spinlock.
  21          */
  22         struct rw_semaphore sem;
  23
  24         /* protects page tables, directory tables and pt tables.
  25          * and pt structures.
  26          */
  27         spinlock_t lock;
  28
  29         atomic_t needs_tlbflush;
  30         atomic_t *msvdx_mmu_invaldc;
  31         struct psb_mmu_pd *default_pd;
  32         uint32_t bif_ctrl;
  33         int has_clflush;
  34         int clflush_add;
  35         unsigned long clflush_mask;
  36
  37         struct drm_device *dev;
  38 };
  39
  40 struct psb_mmu_pd;
  41
  42 struct psb_mmu_pt {
  43         struct psb_mmu_pd *pd;
  44         uint32_t index;
  45         uint32_t count;
  46         struct page *p;
  47         uint32_t *v;
  48 };
  49
  50 struct psb_mmu_pd {
  51         struct psb_mmu_driver *driver;
  52         int hw_context;
  53         struct psb_mmu_pt **tables;
  54         struct page *p;
  55         struct page *dummy_pt;
  56         struct page *dummy_page;
  57         uint32_t pd_mask;
  58         uint32_t invalid_pde;
  59         uint32_t invalid_pte;
  60 };
  61
  62 extern struct psb_mmu_driver *psb_mmu_driver_init(struct drm_device *dev,
  63                                                   int trap_pagefaults,
  64                                                   int invalid_type,
  65                                                   atomic_t *msvdx_mmu_invaldc);
  66 extern void psb_mmu_driver_takedown(struct psb_mmu_driver *driver);
  67 extern struct psb_mmu_pd *psb_mmu_get_default_pd(struct psb_mmu_driver
  68                                                  *driver);
  69 extern struct psb_mmu_pd *psb_mmu_alloc_pd(struct psb_mmu_driver *driver,
  70                                            int trap_pagefaults,
  71                                            int invalid_type);
  72 extern void psb_mmu_free_pagedir(struct psb_mmu_pd *pd);
  73 extern void psb_mmu_flush(struct psb_mmu_driver *driver);
  74 extern void psb_mmu_remove_pfn_sequence(struct psb_mmu_pd *pd,
  75                                         unsigned long address,
  76                                         uint32_t num_pages);
  77 extern int psb_mmu_insert_pfn_sequence(struct psb_mmu_pd *pd,
  78                                        uint32_t start_pfn,
  79                                        unsigned long address,
  80                                        uint32_t num_pages, int type);
  81 extern int psb_mmu_virtual_to_pfn(struct psb_mmu_pd *pd, uint32_t virtual,
  82                                   unsigned long *pfn);
  83 extern void psb_mmu_set_pd_context(struct psb_mmu_pd *pd, int hw_context);
  84 extern int psb_mmu_insert_pages(struct psb_mmu_pd *pd, struct page **pages,
  85                                 unsigned long address, uint32_t num_pages,
  86                                 uint32_t desired_tile_stride,
  87                                 uint32_t hw_tile_stride, int type);
  88 extern void psb_mmu_remove_pages(struct psb_mmu_pd *pd,
  89                                  unsigned long address, uint32_t num_pages,
  90                                  uint32_t desired_tile_stride,
  91                                  uint32_t hw_tile_stride);
  92
  93 #endif