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Subject[PATCH 05/14] PCI/P2PDMA: Factor out host_bridge_whitelist()
Push both PCI devices into the whitelist checking function seeing
some hardware will require us ensuring they are on the same host
bridge.

At the same time we rename root_complex_whitelist() to
host_bridge_whitelist() to match the terminology used in the code.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
drivers/pci/p2pdma.c | 31 ++++++++++++++++++++-----------
1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 25663c1d8bc9..dfb802afc8ca 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -250,19 +250,11 @@ static void seq_buf_print_bus_devfn(struct seq_buf *buf, struct pci_dev *pdev)
seq_buf_printf(buf, "%s;", pci_name(pdev));
}

-/*
- * If we can't find a common upstream bridge take a look at the root
- * complex and compare it to a whitelist of known good hardware.
- */
-static bool root_complex_whitelist(struct pci_dev *dev)
+static bool __host_bridge_whitelist(struct pci_host_bridge *host)
{
- struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
struct pci_dev *root = pci_get_slot(host->bus, PCI_DEVFN(0, 0));
unsigned short vendor, device;

- if (iommu_present(dev->dev.bus))
- return false;
-
if (!root)
return false;

@@ -277,6 +269,24 @@ static bool root_complex_whitelist(struct pci_dev *dev)
return false;
}

+/*
+ * If we can't find a common upstream bridge take a look at the root
+ * complex and compare it to a whitelist of known good hardware.
+ */
+static bool host_bridge_whitelist(struct pci_dev *a, struct pci_dev *b)
+{
+ struct pci_host_bridge *host_a = pci_find_host_bridge(a->bus);
+ struct pci_host_bridge *host_b = pci_find_host_bridge(b->bus);
+
+ if (iommu_present(a->dev.bus) || iommu_present(b->dev.bus))
+ return false;
+
+ if (__host_bridge_whitelist(host_a) && __host_bridge_whitelist(host_b))
+ return true;
+
+ return false;
+}
+
enum {
/*
* Thes arbitrary offset are or'd onto the upstream distance
@@ -412,8 +422,7 @@ static int upstream_bridge_distance(struct pci_dev *provider,
if (!(dist & P2PDMA_THRU_HOST_BRIDGE))
goto store_and_return;

- if (!root_complex_whitelist(provider) ||
- !root_complex_whitelist(client))
+ if (!host_bridge_whitelist(provider, client))
dist |= P2PDMA_NOT_SUPPORTED;

store_and_return:
--
2.20.1
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