Alex Waterman aee5511bc8 gpu: nvgpu: Update pd_cache to handle 64K pages ...

Update the PD cache code to handle 64KB pages. To do this the
number of partial/full lists is expanded for when we have 64K
pages. Currently we only explicitly support 4K and 64K page
sizes. Other pages sizes (16K for example) will fail compilation
during preprocessing.

This change also cleans up the definitions for some of the
internal structs. They have been moved into pd_cache.c since
they are not used outside of pd_cache.c.

This allows the following functions to be removed from the global
context:

  __nvgpu_pd_cache_alloc_direct()
  __nvgpu_pd_cache_free_direct()

They have been replaced by calls to nvgpu_pd_{alloc,free}().

The nvgpu_pd_mem_entry alloc_map also had to be expanded to a
real bitmap. 32 or 64 bits is not sufficient for packing 256
byte PDs into a 64K page (there's 256 PDs per nvgpu_pd_mem_entry
in that case). To prevent doing too many find_first_zero
operations on the bitmap an 'allocs' field was also added which
tracks how many allocs are done. We can use this instead of
comparing a mask against the bitmap to determine if an
nvgpu_pd_mem_entry is full.

Note: there's still a limitation with the TLB invalidate code:
it simply assumes an nvgpu_mem is a 1 to 1 with a PDB. This means
we can't invalidate a PDB allocated at an offset greater than 0
in a nvgpu_pd_mem_entry. This in turn means we must always use a
full page size for a context's PDB.

Bug 1977822

Change-Id: I6a7a3a95b7c902bc6487cba05fde58fbc4a25da5
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1718755
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2018-10-29 21:56:59 -07:00

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