Remove dependency on Jetson (nvgpu) driver internals

For integrated (Jetson) GPUs:
- Directly retrieve and map GPU register region 0
- Directly check GPU power-on state before a register read/write
- Resume the GPU as needed for a register read/write

Most nvgpu APIs can now be called on TX2+ integrated GPUs without
first having to start some task on the GPU to make it non-suspended.

Tested on Jetson TX1, TX2, Xavier, and Orin.

1 files changed, 0 insertions, 12 deletions

diff --git a/nvdebug_linux.h b/nvdebug_linux.h
index 022d1cf..2ad4ce1 100644
--- a/nvdebug_linux.h
+++ b/nvdebug_linux.h
@@ -35,15 +35,3 @@ static inline int file2parentgpuidx(const struct file *f) {
         // module.
         return (uintptr_t)pde_data(file_dentry(f)->d_parent->d_inode);
 }
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)
-// Commit 643eb158a3 in nvgpu moved the mapped registers to the second entry
-// of the gk20a struct (after a function pointer). This change was made as L4T
-// was upgraded from Linux 4.9 to 5.10 (r32 -> r34+)
-// Note that this is wrong if nvgpu was built without CONFIG_NVGPU_NON_FUSA
-// i.e. if FUSA was enabled, this is wrong.
-#define gk20a_regs(gk20a) (*(void**)((void*)gk20a + sizeof(void(*)(void))))
-#else
-#include <os/linux/os_linux.h>  // For struct nvgpu_os_linux, which holds regs
-#define gk20a_regs(gk20a) (container_of(gk20a, struct nvgpu_os_linux, g)->regs)
-#endif