powerpc/powernv/pci: Refactor pnv_ioda_alloc_pe()

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Rework the PE allocation logic to allow allocating blocks of PEs rather
than individually. We'll use this to allocate contigious blocks of PEs for
the SR-IOVs.

This patch also adds code to pnv_ioda_alloc_pe() and pnv_ioda_reserve_pe() to
use the existing, but unused, phb->pe_alloc_mutex. Currently these functions
use atomic bit ops to release a currently allocated PE number. However,
the pnv_ioda_alloc_pe() wants to have exclusive access to the bit map while
scanning for hole large enough to accomodate the allocation size.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200722065715.1432738-10-oohall@gmail.com

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Oliver O'Halloran 2020-07-22 16:57:09 +10:00 • committed by Michael Ellerman

parent a610d35cc8

commit a4bc676ed5

2 changed files with 34 additions and 9 deletions

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43

arch/powerpc/platforms/powernv/pci-ioda.c

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2

arch/powerpc/platforms/powernv/pci.h

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