On Tue, Sep 10, 2013 at 04:16:50PM +0300, Mika Kuoppala wrote:
> Current policy is to ban context if it manages to hang
> gpu in a certain time windows. Paul Berry asked if more
> strict policy could be available for use cases where
> the application doesn't know if the rendering command stream
> sent to gpu is valid or not.
>
> Provide an option, flag on context creation time, to let
> userspace to set more strict policy for handling gpu hangs for
> this context. If context with this flag set ever hangs the gpu,
> it will be permanently banned from accessing the GPU.
> All subsequent batch submissions will return -EIO.
>
> Requested-by: Paul Berry <stereotype441@xxxxxxxxx>
> Cc: Paul Berry <stereotype441@xxxxxxxxx>
> Cc: Ben Widawsky <ben@xxxxxxxxxxxx>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_dma.c | 3 +++
> drivers/gpu/drm/i915/i915_drv.h | 3 +++
> drivers/gpu/drm/i915/i915_gem.c | 9 ++++++++-
> drivers/gpu/drm/i915/i915_gem_context.c | 12 +++++++++---
> include/uapi/drm/i915_drm.h | 5 +++++
> 5 files changed, 28 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 3de6050..4353458 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1003,6 +1003,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
> case I915_PARAM_HAS_EXEC_HANDLE_LUT:
> value = 1;
> break;
> + case I915_PARAM_HAS_CONTEXT_BAN:
> + value = 1;
> + break;
As we add the flags, we have a better method for detecting whether the
context accepts the flags (just request that a first-ban context be
created and mark the failure as unsupported), and so the getparam is
redundant.
> struct drm_i915_gem_context_create {
> /* output: id of new context*/
> __u32 ctx_id;
> __u32 pad;
> + __u64 flags;
> };
I thought that the size of the ioctl was part of the ABI, but it does
look like extending it as you have done here is valid. TIL.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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