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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 <nvgpu/vm.h>
#include "gk20a/gk20a.h"
#include "gk20a/platform_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;
}
/* address space interfaces for the gk20a module */
static int gk20a_vm_alloc_share(struct gk20a_as_share *as_share,
u32 big_page_size, u32 flags)
{
struct gk20a_as *as = as_share->as;
struct gk20a *g = gk20a_from_as(as);
struct mm_gk20a *mm = &g->mm;
struct vm_gk20a *vm;
char name[32];
const bool userspace_managed =
(flags & NVGPU_GPU_IOCTL_ALLOC_AS_FLAGS_USERSPACE_MANAGED) != 0;
gk20a_dbg_fn("");
if (big_page_size == 0) {
big_page_size = g->ops.mm.get_default_big_page_size();
} else {
if (!is_power_of_2(big_page_size))
return -EINVAL;
if (!(big_page_size & g->gpu_characteristics.available_big_page_sizes))
return -EINVAL;
}
snprintf(name, sizeof(name), "as_%d", as_share->id);
vm = nvgpu_vm_init(g, big_page_size,
big_page_size << 10,
mm->channel.kernel_size,
mm->channel.user_size + mm->channel.kernel_size,
!mm->disable_bigpage, userspace_managed, name);
if (!vm)
return -ENOMEM;
as_share->vm = vm;
vm->as_share = as_share;
vm->enable_ctag = true;
return 0;
}
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 = gk20a_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;
}
int gk20a_vm_release_share(struct gk20a_as_share *as_share)
{
struct vm_gk20a *vm = as_share->vm;
gk20a_dbg_fn("");
vm->as_share = NULL;
as_share->vm = NULL;
nvgpu_vm_put(vm);
return 0;
}
/*
* 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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