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gpu: nvgpu: provide usermode region via mmap

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Add a mmap callback on the control device node for mapping the usermode
register region to userspace. Each such mapping is removed when the GPU
railgates, and brought back again on unrailgate.

The mapping offset must be 0 and its size must be 4 KB.

Bug 200145225

Change-Id: Ie8d3758da745b958376292691d7d1d02a24e7815
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1795819
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Konsta Holtta
2018-09-11 14:46:09 +03:00
committed by mobile promotions
parent d53495400e
commit f33935f426
4 changed files with 140 additions and 1 deletions
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4
drivers/gpu/nvgpu/os/linux/ioctl_ctrl.h
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@@ -19,5 +19,9 @@
int gk20a_ctrl_dev_open(struct inode *inode, struct file *filp);
int gk20a_ctrl_dev_release(struct inode *inode, struct file *filp);
long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
int gk20a_ctrl_dev_mmap(struct file *filp, struct vm_area_struct *vma);
void nvgpu_hide_usermode_for_poweroff(struct gk20a *g);
void nvgpu_restore_usermode_for_poweron(struct gk20a *g);
#endif