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/*
* GK20A Address Spaces
*
* Copyright (c) 2011-2017, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <trace/events/gk20a.h>
#include <nvgpu/kmem.h>
#include "gk20a/gk20a.h"
/* dumb allocator... */
static int generate_as_share_id(struct gk20a_as *as)
{
gk20a_dbg_fn("");
return ++as->last_share_id;
}
/* still dumb */
static void release_as_share_id(struct gk20a_as *as, int id)
{
gk20a_dbg_fn("");
return;
}
int gk20a_as_alloc_share(struct gk20a *g,
u32 big_page_size, u32 flags,
struct gk20a_as_share **out)
{
struct gk20a_as_share *as_share;
int err = 0;
gk20a_dbg_fn("");
g = gk20a_get(g);
if (!g)
return -ENODEV;
*out = NULL;
as_share = nvgpu_kzalloc(g, sizeof(*as_share));
if (!as_share)
return -ENOMEM;
as_share->as = &g->as;
as_share->id = generate_as_share_id(as_share->as);
/* this will set as_share->vm. */
err = gk20a_busy(g);
if (err)
goto failed;
err = g->ops.mm.vm_alloc_share(as_share, big_page_size, flags);
gk20a_idle(g);
if (err)
goto failed;
*out = as_share;
return 0;
failed:
nvgpu_kfree(g, as_share);
return err;
}
/*
* channels and the device nodes call this to release.
* once the ref_cnt hits zero the share is deleted.
*/
int gk20a_as_release_share(struct gk20a_as_share *as_share)
{
struct gk20a *g = as_share->vm->mm->g;
int err;
gk20a_dbg_fn("");
err = gk20a_busy(g);
if (err)
goto release_fail;
err = gk20a_vm_release_share(as_share);
gk20a_idle(g);
release_fail:
release_as_share_id(as_share->as, as_share->id);
gk20a_put(g);
nvgpu_kfree(g, as_share);
return err;
}
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