On Tue, Apr 19, 2016 at 09:57:14AM +0100, Tvrtko Ursulin wrote:
>
> On 19/04/16 07:49, Chris Wilson wrote:
> >The hardware tracks contexts and expects all live contexts (those active
> >on the hardware) to have a unique identifier. This is used by the
> >hardware to assign pagefaults and the like to a particular context.
> >
> >Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> >---
> > drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
> > drivers/gpu/drm/i915/i915_drv.h | 4 ++++
> > drivers/gpu/drm/i915/i915_gem_context.c | 32
> > ++++++++++++++++++++++++++++++++
> > 3 files changed, 37 insertions(+), 1 deletion(-)
> >
> >diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> >b/drivers/gpu/drm/i915/i915_debugfs.c
> >index ffc4734cb2dc..cacbe45b7938 100644
> >--- a/drivers/gpu/drm/i915/i915_debugfs.c
> >+++ b/drivers/gpu/drm/i915/i915_debugfs.c
> >@@ -2014,7 +2014,7 @@ static int i915_context_status(struct seq_file *m,
> >void *unused)
> > ctx->legacy_hw_ctx.rcs_state == NULL)
> > continue;
> >
> >- seq_puts(m, "HW context ");
> >+ seq_printf(m, "HW context %d ", ctx->hw_id);
>
> Should be %u.
>
> > describe_ctx(m, ctx);
> > if (ctx == dev_priv->kernel_context)
> > seq_printf(m, "(kernel context) ");
> >diff --git a/drivers/gpu/drm/i915/i915_drv.h
> >b/drivers/gpu/drm/i915/i915_drv.h
> >index dc3bb5c10957..368fd7090189 100644
> >--- a/drivers/gpu/drm/i915/i915_drv.h
> >+++ b/drivers/gpu/drm/i915/i915_drv.h
> >@@ -851,6 +851,7 @@ struct intel_context {
> > struct i915_ctx_hang_stats hang_stats;
> > struct i915_hw_ppgtt *ppgtt;
> >
> >+ unsigned hw_id;
> > unsigned flags;
> > #define CONTEXT_NO_ZEROMAP (1<<0)
> > #define CONTEXT_NO_ERROR_CAPTURE (1<<1)
> >@@ -1810,6 +1811,9 @@ struct drm_i915_private {
> > DECLARE_HASHTABLE(mm_structs, 7);
> > struct mutex mm_lock;
> >
> >+ struct ida context_hw_ida;
> >+#define MAX_CONTEXT_HW_ID (1<<20)
>
> BUILD_BUG_ON somewhere if someone in the future is tempted to
> increase this without realizing ids returned by ida_simple_get are
> limited to 0x80000000 ?
How do you fancy a BUILD_BUG_ON? (Just not seeing what I should assert.)
The max-value chosen here is lifted from the ctx-descriptor (as you
know). A comment is definitely in order to explain the limit.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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