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| author | Gavin Shan <gwshan@linux.vnet.ibm.com> | 2016-05-20 16:41:35 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-06-21 15:30:55 +1000 |
| commit | c5f7700bbd2e6b598738d85a6c46887b8c8fb6c5 (patch) | |
| tree | c2d9127a35e7a0615c3983f9051c29dc2fff2265 /arch/powerpc/platforms/powernv/pci.h | |
| parent | 93e01a5039915048e6b0be559ca4bfba1cce6f71 (diff) | |
powerpc/powernv: Dynamically release PE
This supports releasing PEs dynamically. A reference count is
introduced to PE representing number of PCI devices associated
with the PE. The reference count is increased when PCI device
joins the PE and decreased when PCI device leaves the PE in
pnv_pci_release_device(). When the count becomes zero, the PE
and its consumed resources are released. Note that the count
is accessed concurrently. So a counter with "int" type is enough
here.
In order to release the sources consumed by the PE, couple of
helper functions are introduced as below:
* pnv_pci_ioda1_unset_window() - Unset IODA1 DMA32 window
* pnv_pci_ioda1_release_dma_pe() - Release IODA1 DMA32 segments
* pnv_pci_ioda2_release_dma_pe() - Release IODA2 DMA resource
* pnv_ioda_release_pe_seg() - Unmap IO/M32/M64 segments
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms/powernv/pci.h')
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h index 8927e5d1c09e..3a97990a4dad 100644 --- a/arch/powerpc/platforms/powernv/pci.h +++ b/arch/powerpc/platforms/powernv/pci.h @@ -30,6 +30,7 @@ struct pnv_phb; struct pnv_ioda_pe { unsigned long flags; struct pnv_phb *phb; + int device_count; /* A PE can be associated with a single device or an * entire bus (& children). In the former case, pdev |