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authorChris Wilson <chris@chris-wilson.co.uk>2017-11-10 14:26:33 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2017-11-10 17:23:10 +0000
commitd2b4b97933f5adacfba42dc3b9200d0e21fbe2c4 (patch)
treeed930479bbd2f36b2f28997fc4f2ccb2f37824e3 /include/uapi/drm
parentf4e15af7e21861445821d5f09922ef7e695269a1 (diff)
drm/i915: Record the default hw state after reset upon load
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
Diffstat (limited to 'include/uapi/drm')
-rw-r--r--include/uapi/drm/i915_drm.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 1f7dfb22a7c2..6c02ced663f8 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -466,6 +466,21 @@ typedef struct drm_i915_irq_wait {
*/
#define I915_PARAM_HAS_EXEC_FENCE_ARRAY 49
+/*
+ * Query whether every context (both per-file default and user created) is
+ * isolated (insofar as HW supports). If this parameter is not true, then
+ * freshly created contexts may inherit values from an existing context,
+ * rather than default HW values. If true, it also ensures (insofar as HW
+ * supports) that all state set by this context will not leak to any other
+ * context.
+ *
+ * As not every engine across every gen support contexts, the returned
+ * value reports the support of context isolation for individual engines by
+ * returning a bitmask of each engine class set to true if that class supports
+ * isolation.
+ */
+#define I915_PARAM_HAS_CONTEXT_ISOLATION 50
+
typedef struct drm_i915_getparam {
__s32 param;
/*

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