diff options
| author | Alistair Popple | 2016-01-08 11:35:09 +1100 |
|---|---|---|
| committer | Michael Ellerman | 2016-01-11 20:30:48 +1100 |
| commit | 419dbd5e1ff0e45a6e1d28c1f7b74d121d2a56e7 (patch) | |
| tree | c6a12df0c929bace0032753a38baef81c9e0259a /arch | |
| parent | b0eab5b29a55fd9f31fad28df520337545c813ef (diff) | |
powerpc/powernv: Fix update of NVLink DMA mask
The emulated NVLink PCI devices share the same IODA2 TCE tables but only
support a single TVT (instead of the normal two for PCI devices). This
requires the kernel to manually replace windows with either the bypass
or non-bypass window depending on what the driver has requested.
Unfortunately an incorrect optimisation was made in
pnv_pci_ioda_dma_set_mask() which caused updating of some NPU device PEs
to be skipped in certain configurations due to an incorrect assumption
that a NULL peer PE in the array indicated there were no more peers
present. This patch fixes the problem by ensuring all peer PEs are
updated.
Fixes: 5d2aa710e697 ("powerpc/powernv: Add support for Nvlink NPUs")
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 323e1e58da93..458133f3c020 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -1612,7 +1612,10 @@ static int pnv_pci_ioda_dma_set_mask(struct pci_dev *pdev, u64 dma_mask) /* Update peer npu devices */ if (pe->flags & PNV_IODA_PE_PEER) - for (i = 0; pe->peers[i]; i++) { + for (i = 0; i < PNV_IODA_MAX_PEER_PES; i++) { + if (!pe->peers[i]) + continue; + linked_npu_dev = pe->peers[i]->pdev; if (dma_get_mask(&linked_npu_dev->dev) != dma_mask) dma_set_mask(&linked_npu_dev->dev, dma_mask); |