drivers/gpu/drm/msm/msm_gem.h

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that 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  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef __MSM_GEM_H__
  19 #define __MSM_GEM_H__
  20
  21 #include <linux/kref.h>
  22 #include <linux/reservation.h>
  23 #include "msm_drv.h"
  24
  25 /* Additional internal-use only BO flags: */
  26 #define MSM_BO_STOLEN        0x10000000    /* try to use stolen/splash memory */
  27
  28 struct msm_gem_address_space {
  29         const char *name;
  30         /* NOTE: mm managed at the page level, size is in # of pages
  31          * and position mm_node->start is in # of pages:
  32          */
  33         struct drm_mm mm;
  34         spinlock_t lock; /* Protects drm_mm node allocation/removal */
  35         struct msm_mmu *mmu;
  36         struct kref kref;
  37 };
  38
  39 struct msm_gem_vma {
  40         struct drm_mm_node node;
  41         uint64_t iova;
  42         struct msm_gem_address_space *aspace;
  43         struct list_head list;    /* node in msm_gem_object::vmas */
  44 };
  45
  46 struct msm_gem_object {
  47         struct drm_gem_object base;
  48
  49         uint32_t flags;
  50
  51         /**
  52          * Advice: are the backing pages purgeable?
  53          */
  54         uint8_t madv;
  55
  56         /**
  57          * count of active vmap'ing
  58          */
  59         uint8_t vmap_count;
  60
  61         /* And object is either:
  62          *  inactive - on priv->inactive_list
  63          *  active   - on one one of the gpu's active_list..  well, at
  64          *     least for now we don't have (I don't think) hw sync between
  65          *     2d and 3d one devices which have both, meaning we need to
  66          *     block on submit if a bo is already on other ring
  67          *
  68          */
  69         struct list_head mm_list;
  70         struct msm_gpu *gpu;     /* non-null if active */
  71
  72         /* Transiently in the process of submit ioctl, objects associated
  73          * with the submit are on submit->bo_list.. this only lasts for
  74          * the duration of the ioctl, so one bo can never be on multiple
  75          * submit lists.
  76          */
  77         struct list_head submit_entry;
  78
  79         struct page **pages;
  80         struct sg_table *sgt;
  81         void *vaddr;
  82
  83         struct list_head vmas;    /* list of msm_gem_vma */
  84
  85         /* normally (resv == &_resv) except for imported bo's */
  86         struct reservation_object *resv;
  87         struct reservation_object _resv;
  88
  89         /* For physically contiguous buffers.  Used when we don't have
  90          * an IOMMU.  Also used for stolen/splashscreen buffer.
  91          */
  92         struct drm_mm_node *vram_node;
  93         struct mutex lock; /* Protects resources associated with bo */
  94 };
  95 #define to_msm_bo(x) container_of(x, struct msm_gem_object, base)
  96
  97 static inline bool is_active(struct msm_gem_object *msm_obj)
  98 {
  99         return msm_obj->gpu != NULL;
 100 }
 101
 102 static inline bool is_purgeable(struct msm_gem_object *msm_obj)
 103 {
 104         WARN_ON(!mutex_is_locked(&msm_obj->base.dev->struct_mutex));
 105         return (msm_obj->madv == MSM_MADV_DONTNEED) && msm_obj->sgt &&
 106                         !msm_obj->base.dma_buf && !msm_obj->base.import_attach;
 107 }
 108
 109 static inline bool is_vunmapable(struct msm_gem_object *msm_obj)
 110 {
 111         return (msm_obj->vmap_count == 0) && msm_obj->vaddr;
 112 }
 113
 114 /* The shrinker can be triggered while we hold objA->lock, and need
 115  * to grab objB->lock to purge it.  Lockdep just sees these as a single
 116  * class of lock, so we use subclasses to teach it the difference.
 117  *
 118  * OBJ_LOCK_NORMAL is implicit (ie. normal mutex_lock() call), and
 119  * OBJ_LOCK_SHRINKER is used by shrinker.
 120  *
 121  * It is *essential* that we never go down paths that could trigger the
 122  * shrinker for a purgable object.  This is ensured by checking that
 123  * msm_obj->madv == MSM_MADV_WILLNEED.
 124  */
 125 enum msm_gem_lock {
 126         OBJ_LOCK_NORMAL,
 127         OBJ_LOCK_SHRINKER,
 128 };
 129
 130 void msm_gem_purge(struct drm_gem_object *obj, enum msm_gem_lock subclass);
 131 void msm_gem_vunmap(struct drm_gem_object *obj, enum msm_gem_lock subclass);
 132
 133 /* Created per submit-ioctl, to track bo's and cmdstream bufs, etc,
 134  * associated with the cmdstream submission for synchronization (and
 135  * make it easier to unwind when things go wrong, etc).  This only
 136  * lasts for the duration of the submit-ioctl.
 137  */
 138 struct msm_gem_submit {
 139         struct drm_device *dev;
 140         struct msm_gpu *gpu;
 141         struct list_head node;   /* node in ring submit list */
 142         struct list_head bo_list;
 143         struct ww_acquire_ctx ticket;
 144         uint32_t seqno;         /* Sequence number of the submit on the ring */
 145         struct dma_fence *fence;
 146         struct msm_gpu_submitqueue *queue;
 147         struct pid *pid;    /* submitting process */
 148         bool valid;         /* true if no cmdstream patching needed */
 149         struct msm_ringbuffer *ring;
 150         unsigned int nr_cmds;
 151         unsigned int nr_bos;
 152         struct {
 153                 uint32_t type;
 154                 uint32_t size;  /* in dwords */
 155                 uint64_t iova;
 156                 uint32_t idx;   /* cmdstream buffer idx in bos[] */
 157         } *cmd;  /* array of size nr_cmds */
 158         struct {
 159                 uint32_t flags;
 160                 struct msm_gem_object *obj;
 161                 uint64_t iova;
 162         } bos[0];
 163 };
 164
 165 #endif /* __MSM_GEM_H__ */