[PATCH v3 3/3] dmr/amdgpu: Add system auto reboot to RAS.

[Alex Deucher]

On Fri, Aug 30, 2019 at 12:39 PM Andrey Grodzovsky
<andrey.grodzovsky at amd.com> wrote:
>
> In case of RAS error allow user configure auto system
> reboot through ras_ctrl.
> This is also part of the temproray work around for the RAS
> hang problem.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>

Typo in title: dmr -> drm

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 18 ++++++++++++++++++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c    | 10 +++++++++-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h    |  1 +
>  3 files changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index c9825ae..e26f2e9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3760,6 +3760,24 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
>         int i, r = 0;
>         bool in_ras_intr = amdgpu_ras_intr_triggered();
>
> +       /*
> +        * Flush RAM to disk so that after reboot
> +        * the user can read log and see why the system rebooted.
> +        *
> +        * Using user mode app call instead of kernel APIs such as
> +        * ksys_sync_helper for backward comparability with earlier
> +        * kernels into which this is also intended.
> +        */
> +       if (in_ras_intr && amdgpu_ras_get_context(adev)->reboot) {
> +               char *envp[] = { "HOME=/", NULL };
> +               char *argv[] = { "/bin/sync", NULL };
> +
> +               DRM_WARN("Emergency reboot.");
> +
> +               call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
> +               emergency_restart();
> +       }
> +

This is fine for dkms, but for upstream/amd-staging, we probably want
to call the appropriate APIs directly.

>         need_full_reset = job_signaled = false;
>         INIT_LIST_HEAD(&device_list);
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> index 1cc34de..bbcfb4f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> @@ -30,6 +30,7 @@
>  #include "amdgpu_ras.h"
>  #include "amdgpu_atomfirmware.h"
>  #include "ivsrcid/nbio/irqsrcs_nbif_7_4.h"
> +#include <linux/kmod.h>
>
>  const char *ras_error_string[] = {
>         "none",
> @@ -154,6 +155,8 @@ static int amdgpu_ras_debugfs_ctrl_parse_data(struct file *f,
>                 op = 1;
>         else if (sscanf(str, "inject %32s %8s", block_name, err) == 2)
>                 op = 2;
> +       else if (sscanf(str, "reboot %32s", block_name) == 1)
> +               op = 3;
>         else if (str[0] && str[1] && str[2] && str[3])
>                 /* ascii string, but commands are not matched. */
>                 return -EINVAL;
> @@ -287,6 +290,9 @@ static ssize_t amdgpu_ras_debugfs_ctrl_write(struct file *f, const char __user *
>                 /* data.inject.address is offset instead of absolute gpu address */
>                 ret = amdgpu_ras_error_inject(adev, &data.inject);
>                 break;
> +       case 3:
> +               amdgpu_ras_get_context(adev)->reboot = true;
> +               break;
>         default:
>                 ret = -EINVAL;
>                 break;
> @@ -1733,6 +1739,8 @@ int amdgpu_ras_fini(struct amdgpu_device *adev)
>  void amdgpu_ras_global_ras_isr(struct amdgpu_device *adev)
>  {
>         if (atomic_cmpxchg(&amdgpu_ras_in_intr, 0, 1) == 0) {
> -               DRM_WARN("RAS event of type ERREVENT_ATHUB_INTERRUPT detected! Stopping all GPU jobs.\n");
> +               DRM_WARN("RAS event of type ERREVENT_ATHUB_INTERRUPT detected!\n");
> +
> +               amdgpu_ras_reset_gpu(adev, false);
>         }
>  }
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> index 3ec2a87..a83ec99 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> @@ -333,6 +333,7 @@ struct amdgpu_ras {
>         struct mutex recovery_lock;
>
>         uint32_t flags;
> +       bool reboot;
>  };
>
>  struct ras_fs_data {
> --
> 2.7.4
>