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drm/i915: Record the default hw state after reset upon load

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Take a copy of the HW state after a reset upon module loading by
executing a context switch from a blank context to the kernel context,
thus saving the default hw state over the blank context image.
We can then use the default hw state to initialise any future context,
ensuring that each starts with the default view of hw state.

v2: Unmap our default state from the GTT after stealing it from the
context. This should stop us from accidentally overwriting it via the
GTT (and frees up some precious GTT space).

Testcase: igt/gem_ctx_isolation
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171110142634.10551-7-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2017-11-10 14:26:33 +00:00
parent f4e15af7e2
commit d2b4b97933
11 changed files with 224 additions and 73 deletions
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1
drivers/gpu/drm/i915/i915_debugfs.c
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@@ -1974,7 +1974,6 @@ static int i915_context_status(struct seq_file *m, void *unused)
struct intel_context *ce = &ctx->engine[engine->id];
seq_printf(m, "%s: ", engine->name);
seq_putc(m, ce->initialised ? 'I' : 'i');
if (ce->state)
describe_obj(m, ce->state->obj);
if (ce->ring)