drivers/gpu/drm/msm/msm_gem.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <robdclark@gmail.com>
   5  */
   6
   7 #ifndef __MSM_GEM_H__
   8 #define __MSM_GEM_H__
   9
  10 #include <linux/kref.h>
  11 #include <linux/reservation.h>
  12 #include "msm_drv.h"
  13
  14 /* Additional internal-use only BO flags: */
  15 #define MSM_BO_STOLEN        0x10000000    /* try to use stolen/splash memory */
  16
  17 struct msm_gem_address_space {
  18         const char *name;
  19         /* NOTE: mm managed at the page level, size is in # of pages
  20          * and position mm_node->start is in # of pages:
  21          */
  22         struct drm_mm mm;
  23         spinlock_t lock; /* Protects drm_mm node allocation/removal */
  24         struct msm_mmu *mmu;
  25         struct kref kref;
  26 };
  27
  28 struct msm_gem_vma {
  29         struct drm_mm_node node;
  30         uint64_t iova;
  31         struct msm_gem_address_space *aspace;
  32         struct list_head list;    /* node in msm_gem_object::vmas */
  33         bool mapped;
  34         int inuse;
  35 };
  36
  37 struct msm_gem_object {
  38         struct drm_gem_object base;
  39
  40         uint32_t flags;
  41
  42         /**
  43          * Advice: are the backing pages purgeable?
  44          */
  45         uint8_t madv;
  46
  47         /**
  48          * count of active vmap'ing
  49          */
  50         uint8_t vmap_count;
  51
  52         /* And object is either:
  53          *  inactive - on priv->inactive_list
  54          *  active   - on one one of the gpu's active_list..  well, at
  55          *     least for now we don't have (I don't think) hw sync between
  56          *     2d and 3d one devices which have both, meaning we need to
  57          *     block on submit if a bo is already on other ring
  58          *
  59          */
  60         struct list_head mm_list;
  61         struct msm_gpu *gpu;     /* non-null if active */
  62
  63         /* Transiently in the process of submit ioctl, objects associated
  64          * with the submit are on submit->bo_list.. this only lasts for
  65          * the duration of the ioctl, so one bo can never be on multiple
  66          * submit lists.
  67          */
  68         struct list_head submit_entry;
  69
  70         struct page **pages;
  71         struct sg_table *sgt;
  72         void *vaddr;
  73
  74         struct list_head vmas;    /* list of msm_gem_vma */
  75
  76         struct llist_node freed;
  77
  78         /* For physically contiguous buffers.  Used when we don't have
  79          * an IOMMU.  Also used for stolen/splashscreen buffer.
  80          */
  81         struct drm_mm_node *vram_node;
  82         struct mutex lock; /* Protects resources associated with bo */
  83
  84         char name[32]; /* Identifier to print for the debugfs files */
  85 };
  86 #define to_msm_bo(x) container_of(x, struct msm_gem_object, base)
  87
  88 static inline bool is_active(struct msm_gem_object *msm_obj)
  89 {
  90         return msm_obj->gpu != NULL;
  91 }
  92
  93 static inline bool is_purgeable(struct msm_gem_object *msm_obj)
  94 {
  95         WARN_ON(!mutex_is_locked(&msm_obj->base.dev->struct_mutex));
  96         return (msm_obj->madv == MSM_MADV_DONTNEED) && msm_obj->sgt &&
  97                         !msm_obj->base.dma_buf && !msm_obj->base.import_attach;
  98 }
  99
 100 static inline bool is_vunmapable(struct msm_gem_object *msm_obj)
 101 {
 102         return (msm_obj->vmap_count == 0) && msm_obj->vaddr;
 103 }
 104
 105 /* The shrinker can be triggered while we hold objA->lock, and need
 106  * to grab objB->lock to purge it.  Lockdep just sees these as a single
 107  * class of lock, so we use subclasses to teach it the difference.
 108  *
 109  * OBJ_LOCK_NORMAL is implicit (ie. normal mutex_lock() call), and
 110  * OBJ_LOCK_SHRINKER is used by shrinker.
 111  *
 112  * It is *essential* that we never go down paths that could trigger the
 113  * shrinker for a purgable object.  This is ensured by checking that
 114  * msm_obj->madv == MSM_MADV_WILLNEED.
 115  */
 116 enum msm_gem_lock {
 117         OBJ_LOCK_NORMAL,
 118         OBJ_LOCK_SHRINKER,
 119 };
 120
 121 void msm_gem_purge(struct drm_gem_object *obj, enum msm_gem_lock subclass);
 122 void msm_gem_vunmap(struct drm_gem_object *obj, enum msm_gem_lock subclass);
 123 void msm_gem_free_work(struct work_struct *work);
 124
 125 /* Created per submit-ioctl, to track bo's and cmdstream bufs, etc,
 126  * associated with the cmdstream submission for synchronization (and
 127  * make it easier to unwind when things go wrong, etc).  This only
 128  * lasts for the duration of the submit-ioctl.
 129  */
 130 struct msm_gem_submit {
 131         struct drm_device *dev;
 132         struct msm_gpu *gpu;
 133         struct list_head node;   /* node in ring submit list */
 134         struct list_head bo_list;
 135         struct ww_acquire_ctx ticket;
 136         uint32_t seqno;         /* Sequence number of the submit on the ring */
 137         struct dma_fence *fence;
 138         struct msm_gpu_submitqueue *queue;
 139         struct pid *pid;    /* submitting process */
 140         bool valid;         /* true if no cmdstream patching needed */
 141         bool in_rb;         /* "sudo" mode, copy cmds into RB */
 142         struct msm_ringbuffer *ring;
 143         unsigned int nr_cmds;
 144         unsigned int nr_bos;
 145         u32 ident;         /* A "identifier" for the submit for logging */
 146         struct {
 147                 uint32_t type;
 148                 uint32_t size;  /* in dwords */
 149                 uint64_t iova;
 150                 uint32_t idx;   /* cmdstream buffer idx in bos[] */
 151         } *cmd;  /* array of size nr_cmds */
 152         struct {
 153                 uint32_t flags;
 154                 union {
 155                         struct msm_gem_object *obj;
 156                         uint32_t handle;
 157                 };
 158                 uint64_t iova;
 159         } bos[0];
 160 };
 161
 162 #endif /* __MSM_GEM_H__ */