Add reference counting for channels, and wait for reference count to
get to 0 in gk20a_channel_free() before actually freeing the channel.
Also, change free channel tracking a bit by employing a list of free
channels, which simplifies the procedure of finding available channels
with reference counting.
Each use of a channel must have a reference taken before use or held
by the caller. Taking a reference of a wild channel pointer may fail, if
the channel is either not opened or in a process of being closed. Also,
add safeguards for protecting accidental use of closed channels,
specifically, by setting ch->g = NULL in channel free. This will make it
obvious if freed channel is attempted to be used.
The last user of a channel might be the deferred interrupt handler,
so wait for deferred interrupts to be processed twice in the channel
free procedure: once for providing last notifications to the channel
and once to make sure there are no stale pointers left after referencing
to the channel has been denied.
Finally, fix some races in channel and TSG force reset IOCTL path,
by pausing the channel scheduler in gk20a_fifo_recover_ch() and
gk20a_fifo_recover_tsg(), while the affected engines have been identified,
the appropriate MMU faults triggered, and the MMU faults handled. In this
case, make sure that the MMU fault does not attempt to query the hardware
about the failing channel or TSG ids. This should make channel recovery
more safe also in the regular (i.e., not in the interrupt handler) context.
Bug 1530226
Bug 1597493
Bug 1625901
Bug 200076344
Bug 200071810
Change-Id: Ib274876908e18219c64ea41e50ca443df81d957b
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: http://git-master/r/448463
(cherry picked from commit 3f03aeae64ef2af4829e06f5f63062e8ebd21353)
Reviewed-on: http://git-master/r/755147
Reviewed-by: Automatic_Commit_Validation_User
Use busy looping for l2 tag flush and elpg flush
operations. This is making total flash time more
accurate and reduced overall time compared with
usleep. Also added trace points to measure
performance for these operations.
Also corrected timeout error check for non-silicon
platforms.
Bug 200081799
Change-Id: I63410bb7528db9258501633996fbdee5fdec1c74
Signed-off-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-on: http://git-master/r/710472
(cherry picked from commit 18684cf9d5d6870a1a1fd5711c4fc2d733caad20)
Reviewed-on: http://git-master/r/710986
GVS: Gerrit_Virtual_Submit
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Use busy looping on L2 and TLB maintenance operations. This speeds
them up by an order of magnitude.
Add also trace points to measure performance for memory ops and
interrupt processing.
Change-Id: Ic4a8525d3d946b2b8f57b4b8ddcfc61605619399
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/681640
Add a couple of trace points for tracking when we need to wait for
space in the gpfifo ring buffer. This wait can introduce significant
latencies to rendering with large gpfifo entry inputs so it's good to
be able to measure how often this path is taken.
Bug 1592391
Bug 1550886
Change-Id: I7f362e9c307eeffeeecaaba268ef2e3613e54597
Signed-off-by: Janne Hellsten <jhellsten@nvidia.com>
Reviewed-on: http://git-master/r/674021
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Implement NVGPU_AS_IOCTL_GET_VA_REGIONS which returns a list of GPU VA
regions for different page sizes. This is required for the userspace
for safe fixed-address address space allocation.
Bug 1551752
Change-Id: I63ddde30935db2471bec498dae0caa870e89c1a5
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: http://git-master/r/590814
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Move all channel synchronization code to new channel_sync_gk20a.c/h
files, and access all synchronization functions through function
pointers. This is groundwork for supporting semaphore based channel
synchronization.
Bug 1434573
Bug 1450122
Change-Id: Ic21709c1ee8cf85d018616787988e7eebb399fbe
Signed-off-by: Lauri Peltonen <lpeltonen@nvidia.com>
Reviewed-on: http://git-master/r/374841
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
This patch modifies gk20a driver to use its own trace events instead
of trace events of nvhost.
Bug 1468086
Change-Id: I1f40ba957ec7e25904e9f4621346cb7dc256a550
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/374289
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
