diff options
| author | Jon Derrick <jonathan.derrick@intel.com> | 2020-01-21 14:37:47 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2020-01-24 21:55:26 +0100 |
| commit | 2856ba6020fc5cbf051d5a75b2abb3046072c144 (patch) | |
| tree | 0f93f7ebde7349949dcb9b711ba9537dc8c51b95 /drivers/pci/search.c | |
| parent | x86/PCI: Expose VMD's pci_dev in struct pci_sysdata (diff) | |
| download | linux-2856ba6020fc5cbf051d5a75b2abb3046072c144.tar.xz linux-2856ba6020fc5cbf051d5a75b2abb3046072c144.zip | |
PCI: Introduce pci_real_dma_dev()
The current DMA alias implementation requires the aliased device be on the
same PCI bus as the requester ID. Add an arch-specific mechanism to point
to another PCI device when doing mapping and PCI DMA alias search. The
default case returns the actual device.
Link: https://lore.kernel.org/r/1579613871-301529-4-git-send-email-jonathan.derrick@intel.com
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/pci/search.c')
| -rw-r--r-- | drivers/pci/search.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/pci/search.c b/drivers/pci/search.c index bade14002fd8..efdb8b56035f 100644 --- a/drivers/pci/search.c +++ b/drivers/pci/search.c @@ -32,6 +32,12 @@ int pci_for_each_dma_alias(struct pci_dev *pdev, struct pci_bus *bus; int ret; + /* + * The device may have an explicit alias requester ID for DMA where the + * requester is on another PCI bus. + */ + pdev = pci_real_dma_dev(pdev); + ret = fn(pdev, pci_dev_id(pdev), data); if (ret) return ret; |