[Intel-gfx] [RFC 00/21] Replace seqno values with request structures

[John Harrison]

I have just posted an updated subset of the patch series. Note that one 
patch has been inserted in the middle and the first one has been 
dropped. The correct sequence is now:

    01    drm/i915: Remove redundant parameter to
    i915_gem_object_wait_rendering__tail()
    02    drm/i915: Ensure OLS & PLR are always in sync
    03    drm/i915: Add reference count to request structure
    04    drm/i915: Add helper functions to aid seqno -> request transition
    05    drm/i915: Replace last_[rwf]_seqno with last_[rwf]_req
    06    drm/i915: Ensure requests stick around during waits
    07    drm/i915: Remove 'outstanding_lazy_seqno'
    08    drm/i915: Make 'i915_gem_check_olr' actually check by request
    not seqno
    09    drm/i915: Convert 'last_flip_req' to be a request not a seqno
    10    drm/i915: Convert i915_wait_seqno to i915_wait_request
    11    drm/i915: Convert 'i915_add_request' to take a request not a seqno
    12    drm/i915: Convert mmio_flip::seqno to struct request
    13    drm/i915: Convert 'flip_queued_seqno' into 'flip_queued_request'
    14    drm/i915: Connect requests to rings at creation not submission
    15    drm/i915: Convert most 'i915_seqno_passed' calls into
    'i915_gem_request_completed'
    16    drm/i915: Convert __wait_seqno() to __wait_request()
    17    drm/i915: Convert trace functions from seqno to request
    18    drm/i915: Convert 'trace_irq' to use requests rather than seqnos
    19    drm/i915: Convert semaphores to handle requests not seqnos
    20    drm/i915: Convert 'ring_idle()' to use requests not seqnos
    21    drm/i915: Remove 'obj->ring'
    22    drm/i915: Cache request completion status
    23    drm/i915: Zero fill the request structure
    24    drm/i915: Defer seqno allocation until actual hardware
    submission time


The whole set in its latest and greatest form has also been uploaded to 
the drm-private git as 'topic/seqno-request'.


On 06/10/2014 15:15, John.C.Harrison at Intel.com wrote:
> From: John Harrison <John.C.Harrison at Intel.com>
>
> Work in progress for replacing seqno usage with requst structures.
>
> There is a general feeling that it is better to move away from using a simple
> integer 'seqno' value to track batch buffer completion. Instead, the request
> structure should be used. That provides for much more flexibility going
> forwards. Especially which things like a GPU scheduler (which can re-order batch
> buffers and hence seqnos after submission to the hardware), Android sync points
> and other such features which potentially make seqno usage more and more
> complex.
>
> The current set of patches do most of the seqno to request structure conversion.
> There are still a couple of direct seqno comparisons in the semaphore code. The
> final conversion of a seqno test into a 'completed' flag inside the request
> structure is still do to as well. Along with whatever changes are required to
> maintain such a flag.
>
> The patches are being posted now to make sure that the various people involved
> agree that it is heading in the right direction.
>
> [Patches against drm-intel-nightly tree fetched 11/09/2014]
>
> John Harrison (21):
>    Bug: missing i915_seqno_passed() call?
>    drm/i915: Remove redundant parameter to i915_gem_object_wait_rendering__tail()
>    drm/i915: Ensure OLS & PLR are always in sync
>    drm/i915: Add reference count to request structure
>    drm/i915: Add helper functions to aid seqno -> request transition
>    drm/i915: Replace last_[rwf]_seqno with last_[rwf]_req
>    drm/i915: Ensure requests stick around during waits
>    drm/i915: Remove 'outstanding_lazy_seqno'
>    drm/i915: Make 'i915_gem_check_olr' actually check by request not seqno
>    drm/i915: Convert 'last_flip_req' to be a request not a seqno
>    drm/i915: Convert i915_wait_seqno to i915_wait_request
>    drm/i915: Convert 'i915_add_request' to take a request not a seqno
>    drm/i915: Convert mmio_flip::seqno to struct request
>    drm/i915: Convert 'flip_queued_seqno' into 'flip_queued_request'
>    drm/i915: Convert most 'i915_seqno_passed' calls into 'i915_gem_request_completed'
>    drm/i915: Convert __wait_seqno() to __wait_request()
>    drm/i915: Convert trace functions from seqno to request
>    drm/i915: Convert 'trace_irq' to use requests rather than seqnos
>    drm/i915: Convert semaphores to handle requests not seqnos
>    drm/i915: Convert 'ring_idle()' to use requests not seqnos
>    drm/i915: Remove 'obj->ring'
>
>   drivers/gpu/drm/i915/i915_debugfs.c        |   23 +--
>   drivers/gpu/drm/i915/i915_drv.h            |   64 +++++--
>   drivers/gpu/drm/i915/i915_gem.c            |  265 ++++++++++++++--------------
>   drivers/gpu/drm/i915/i915_gem_context.c    |   12 +-
>   drivers/gpu/drm/i915/i915_gem_execbuffer.c |    8 +-
>   drivers/gpu/drm/i915/i915_gem_gtt.h        |    4 +-
>   drivers/gpu/drm/i915/i915_gem_tiling.c     |    2 +-
>   drivers/gpu/drm/i915/i915_gpu_error.c      |   19 +-
>   drivers/gpu/drm/i915/i915_irq.c            |   12 +-
>   drivers/gpu/drm/i915/i915_trace.h          |   47 ++---
>   drivers/gpu/drm/i915/intel_display.c       |   47 ++---
>   drivers/gpu/drm/i915/intel_drv.h           |    4 +-
>   drivers/gpu/drm/i915/intel_lrc.c           |   49 ++---
>   drivers/gpu/drm/i915/intel_overlay.c       |   17 +-
>   drivers/gpu/drm/i915/intel_ringbuffer.c    |   88 +++++----
>   drivers/gpu/drm/i915/intel_ringbuffer.h    |   24 ++-
>   16 files changed, 392 insertions(+), 293 deletions(-)
>

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