engctx.c

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/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#include <core/object.h>
#include <core/namedb.h>
#include <core/handle.h>
#include <core/client.h>
#include <core/engctx.h>

#include <subdev/vm.h>

static inline int
nouveau_engctx_exists(struct nouveau_object *parent,
              struct nouveau_engine *engine, void **pobject)
{
    struct nouveau_engctx *engctx;
    struct nouveau_object *parctx;

    list_for_each_entry(engctx, &engine->contexts, head) {
        parctx = nv_pclass(nv_object(engctx), NV_PARENT_CLASS);
        if (parctx == parent) {
            atomic_inc(&nv_object(engctx)->refcount);
            *pobject = engctx;
            return 1;
        }
    }

    return 0;
}

int
nouveau_engctx_create_(struct nouveau_object *parent,
               struct nouveau_object *engobj,
               struct nouveau_oclass *oclass,
               struct nouveau_object *pargpu,
               u32 size, u32 align, u32 flags,
               int length, void **pobject)
{
    struct nouveau_client *client = nouveau_client(parent);
    struct nouveau_engine *engine = nv_engine(engobj);
    struct nouveau_object *engctx;
    unsigned long save;
    int ret;

    /* check if this engine already has a context for the parent object,
     * and reference it instead of creating a new one
     */
    spin_lock_irqsave(&engine->lock, save);
    ret = nouveau_engctx_exists(parent, engine, pobject);
    spin_unlock_irqrestore(&engine->lock, save);
    if (ret)
        return ret;

    /* create the new context, supports creating both raw objects and
     * objects backed by instance memory
     */
    if (size) {
        ret = nouveau_gpuobj_create_(parent, engobj, oclass,
                         NV_ENGCTX_CLASS,
                         pargpu, size, align, flags,
                         length, pobject);
    } else {
        ret = nouveau_object_create_(parent, engobj, oclass,
                         NV_ENGCTX_CLASS, length, pobject);
    }

    engctx = *pobject;
    if (ret)
        return ret;

    /* must take the lock again and re-check a context doesn't already
     * exist (in case of a race) - the lock had to be dropped before as
     * it's not possible to allocate the object with it held.
     */
    spin_lock_irqsave(&engine->lock, save);
    ret = nouveau_engctx_exists(parent, engine, pobject);
    if (ret) {
        spin_unlock_irqrestore(&engine->lock, save);
        nouveau_object_ref(NULL, &engctx);
        return ret;
    }

    if (client->vm)
        atomic_inc(&client->vm->engref[nv_engidx(engobj)]);
    list_add(&nv_engctx(engctx)->head, &engine->contexts);
    nv_engctx(engctx)->addr = ~0ULL;
    spin_unlock_irqrestore(&engine->lock, save);
    return 0;
}

void
nouveau_engctx_destroy(struct nouveau_engctx *engctx)
{
    struct nouveau_object *engobj = nv_object(engctx)->engine;
    struct nouveau_engine *engine = nv_engine(engobj);
    struct nouveau_client *client = nouveau_client(engctx);
    unsigned long save;

    nouveau_gpuobj_unmap(&engctx->vma);
    spin_lock_irqsave(&engine->lock, save);
    list_del(&engctx->head);
    spin_unlock_irqrestore(&engine->lock, save);

    if (client->vm)
        atomic_dec(&client->vm->engref[nv_engidx(engobj)]);

    if (engctx->base.size)
        nouveau_gpuobj_destroy(&engctx->base);
    else
        nouveau_object_destroy(&engctx->base.base);
}

int
nouveau_engctx_init(struct nouveau_engctx *engctx)
{
    struct nouveau_object *object = nv_object(engctx);
    struct nouveau_subdev *subdev = nv_subdev(object->engine);
    struct nouveau_object *parent;
    struct nouveau_subdev *pardev;
    int ret;

    ret = nouveau_gpuobj_init(&engctx->base);
    if (ret)
        return ret;

    parent = nv_pclass(object->parent, NV_PARENT_CLASS);
    pardev = nv_subdev(parent->engine);
    if (nv_parent(parent)->context_attach) {
        mutex_lock(&pardev->mutex);
        ret = nv_parent(parent)->context_attach(parent, object);
        mutex_unlock(&pardev->mutex);
    }

    if (ret) {
        nv_error(parent, "failed to attach %s context, %d\n",
             subdev->name, ret);
        return ret;
    }

    nv_debug(parent, "attached %s context\n", subdev->name);
    return 0;
}

int
nouveau_engctx_fini(struct nouveau_engctx *engctx, bool suspend)
{
    struct nouveau_object *object = nv_object(engctx);
    struct nouveau_subdev *subdev = nv_subdev(object->engine);
    struct nouveau_object *parent;
    struct nouveau_subdev *pardev;
    int ret = 0;

    parent = nv_pclass(object->parent, NV_PARENT_CLASS);
    pardev = nv_subdev(parent->engine);
    if (nv_parent(parent)->context_detach) {
        mutex_lock(&pardev->mutex);
        ret = nv_parent(parent)->context_detach(parent, suspend, object);
        mutex_unlock(&pardev->mutex);
    }

    if (ret) {
        nv_error(parent, "failed to detach %s context, %d\n",
             subdev->name, ret);
        return ret;
    }

    nv_debug(parent, "detached %s context\n", subdev->name);
    return nouveau_gpuobj_fini(&engctx->base, suspend);
}

void
_nouveau_engctx_dtor(struct nouveau_object *object)
{
    nouveau_engctx_destroy(nv_engctx(object));
}

int
_nouveau_engctx_init(struct nouveau_object *object)
{
    return nouveau_engctx_init(nv_engctx(object));
}


int
_nouveau_engctx_fini(struct nouveau_object *object, bool suspend)
{
    return nouveau_engctx_fini(nv_engctx(object), suspend);
}

struct nouveau_object *
nouveau_engctx_get(struct nouveau_engine *engine, u64 addr)
{
    struct nouveau_engctx *engctx;
    unsigned long flags;

    spin_lock_irqsave(&engine->lock, flags);
    list_for_each_entry(engctx, &engine->contexts, head) {
        if (engctx->addr == addr) {
            engctx->save = flags;
            return nv_object(engctx);
        }
    }
    spin_unlock_irqrestore(&engine->lock, flags);
    return NULL;
}

void
nouveau_engctx_put(struct nouveau_object *object)
{
    if (object) {
        struct nouveau_engine *engine = nv_engine(object->engine);
        struct nouveau_engctx *engctx = nv_engctx(object);
        spin_unlock_irqrestore(&engine->lock, engctx->save);
    }
}