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/*
* Copyright (c) 2017-2018, 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <nvgpu/types.h>
#include <nvgpu/hw/gv11b/hw_usermode_gv11b.h>
#include "os_linux.h"
/*
* Locks out the driver from accessing GPU registers. This prevents access to
* thse registers after the GPU has been clock or power gated. This should help
* find annoying bugs where register reads and writes are silently dropped
* after the GPU has been turned off. On older chips these reads and writes can
* also lock the entire CPU up.
*/
void nvgpu_lockout_usermode_registers(struct gk20a *g)
{
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
l->usermode_regs = NULL;
}
/*
* Undoes t19x_lockout_registers().
*/
void nvgpu_restore_usermode_registers(struct gk20a *g)
{
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
l->usermode_regs = l->usermode_regs_saved;
}
void nvgpu_remove_usermode_support(struct gk20a *g)
{
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
if (l->usermode_regs) {
l->usermode_regs = NULL;
}
}
void nvgpu_init_usermode_support(struct gk20a *g)
{
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
l->usermode_regs = l->regs + usermode_cfg0_r();
l->usermode_regs_saved = l->usermode_regs;
}
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