diff options
Diffstat (limited to 'include/os/linux/module_usermode.c')
-rw-r--r-- | include/os/linux/module_usermode.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/include/os/linux/module_usermode.c b/include/os/linux/module_usermode.c new file mode 100644 index 0000000..ea01c1b --- /dev/null +++ b/include/os/linux/module_usermode.c | |||
@@ -0,0 +1,62 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2017-2018, NVIDIA CORPORATION. All rights reserved. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify it | ||
5 | * under the terms and conditions of the GNU General Public License, | ||
6 | * version 2, as published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope it will be useful, but WITHOUT | ||
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
11 | * more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public License | ||
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
15 | */ | ||
16 | |||
17 | #include <nvgpu/types.h> | ||
18 | |||
19 | #include <nvgpu/hw/gv11b/hw_usermode_gv11b.h> | ||
20 | |||
21 | #include "os_linux.h" | ||
22 | |||
23 | /* | ||
24 | * Locks out the driver from accessing GPU registers. This prevents access to | ||
25 | * thse registers after the GPU has been clock or power gated. This should help | ||
26 | * find annoying bugs where register reads and writes are silently dropped | ||
27 | * after the GPU has been turned off. On older chips these reads and writes can | ||
28 | * also lock the entire CPU up. | ||
29 | */ | ||
30 | void nvgpu_lockout_usermode_registers(struct gk20a *g) | ||
31 | { | ||
32 | struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g); | ||
33 | |||
34 | l->usermode_regs = NULL; | ||
35 | } | ||
36 | |||
37 | /* | ||
38 | * Undoes t19x_lockout_registers(). | ||
39 | */ | ||
40 | void nvgpu_restore_usermode_registers(struct gk20a *g) | ||
41 | { | ||
42 | struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g); | ||
43 | |||
44 | l->usermode_regs = l->usermode_regs_saved; | ||
45 | } | ||
46 | |||
47 | void nvgpu_remove_usermode_support(struct gk20a *g) | ||
48 | { | ||
49 | struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g); | ||
50 | |||
51 | if (l->usermode_regs) { | ||
52 | l->usermode_regs = NULL; | ||
53 | } | ||
54 | } | ||
55 | |||
56 | void nvgpu_init_usermode_support(struct gk20a *g) | ||
57 | { | ||
58 | struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g); | ||
59 | |||
60 | l->usermode_regs = l->regs + usermode_cfg0_r(); | ||
61 | l->usermode_regs_saved = l->usermode_regs; | ||
62 | } | ||