Re: [igt-dev] [RFC PATCH v10 3/6] lib/igt_gt: use for_each_engine2 to loop through engines

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 05/03/2019 13:16, Andi Shyti wrote:
> 'for_each_engine2()' defines a loop through the gpu engines.
> 
> It can work with both active and pre-defined engines.
> 
> In case we are looping through active engines (i.e. the running
> kernel has the query and get/setparam ioctls), the
> intel_active_engines2 points to an array that contains only the
> list engines dynamically allocated after having interrogated the
> driver.
> 
> While, if we are looping through pre-defined engines,
> intel_active_engines2 points to the 'intel_execution_engines2'
> array and works exactly as for_each_engine() but using the
> new 'struct intel_execution_engine2' data type.
> 
> Signed-off-by: Andi Shyti <andi.shyti@intel.com>
> ---
>   lib/igt_gt.h | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/lib/igt_gt.h b/lib/igt_gt.h
> index f4bd6c22a81a..f8bdaa62899f 100644
> --- a/lib/igt_gt.h
> +++ b/lib/igt_gt.h
> @@ -30,6 +30,8 @@
>   
>   #include "i915_drm.h"
>   
> +#include "i915/gem_engine_topology.h"
> +
>   void igt_require_hang_ring(int fd, int ring);
>   
>   typedef struct igt_hang {
> @@ -86,6 +88,12 @@ extern const struct intel_execution_engine {
>   	     e__++) \
>   		for_if (gem_ring_has_physical_engine(fd__, flags__ = e__->exec_id | e__->flags))
>   
> +#define for_each_engine2(fd, ctx) \
> +		for (struct intel_execution_engine2 *e2__ = \
> +		     gem_set_context_get_engines(fd, ctx); e2__->name; e2__++) \
> +			for_if (gem_has_engine_topology() || \
> +				gem_has_engine(fd, e2__->class, e2__->instance))

gem_has_engine is a legacy hack which shouldn't be used and can 
hopefully be eliminated by the end of this work.

I think this iterator should assume ctx engine map has been configured 
with only available engines so neiher gem_has_engine_topology or 
gem_has_engine should be needed. Unless I am missing something?

> +
>   bool gem_ring_is_physical_engine(int fd, unsigned int ring);
>   bool gem_ring_has_physical_engine(int fd, unsigned int ring);
>   
> 

Regards,

Tvrtko
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