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| author |   Logan Gunthorpe <logang@deltatee.com> | 2021-06-10 10:06:07 -0600 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2021-06-10 18:01:41 -0500 |
| commit | cf201bfe8cdc9ba11c4f312945b908ed24c7b7b5 (patch) | |
| tree | 99303b455a08cbcdf6d8f45c8f4e1ee0886b901e /drivers/pci/p2pdma.c | |
| parent | PCI/P2PDMA: Use correct calc_map_type_and_dist() return type (diff) | |
| download | linux-dev-cf201bfe8cdc9ba11c4f312945b908ed24c7b7b5.tar.xz linux-dev-cf201bfe8cdc9ba11c4f312945b908ed24c7b7b5.zip | |
PCI/P2PDMA: Warn if host bridge not in whitelist
If the host bridge is not in the whitelist print a warning in the
calc_map_type_and_dist_warn() path detailing the vendor and device IDs that
would need to be added to the whitelist.
Suggested-by: Don Dutile <ddutile@redhat.com>
Link: https://lore.kernel.org/r/20210610160609.28447-5-logang@deltatee.com
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/p2pdma.c')
| -rw-r--r-- | drivers/pci/p2pdma.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index abcdb2a6b1c0..c07c928e3952 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -309,7 +309,7 @@ static const struct pci_p2pdma_whitelist_entry { }; static bool __host_bridge_whitelist(struct pci_host_bridge *host, - bool same_host_bridge) + bool same_host_bridge, bool warn) { struct pci_dev *root = pci_get_slot(host->bus, PCI_DEVFN(0, 0)); const struct pci_p2pdma_whitelist_entry *entry; @@ -331,6 +331,10 @@ static bool __host_bridge_whitelist(struct pci_host_bridge *host, return true; } + if (warn) + pci_warn(root, "Host bridge not in P2PDMA whitelist: %04x:%04x\n", + vendor, device); + return false; } @@ -338,16 +342,17 @@ static bool __host_bridge_whitelist(struct pci_host_bridge *host, * 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) +static bool host_bridge_whitelist(struct pci_dev *a, struct pci_dev *b, + bool warn) { 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 (host_a == host_b) - return __host_bridge_whitelist(host_a, true); + return __host_bridge_whitelist(host_a, true, warn); - if (__host_bridge_whitelist(host_a, false) && - __host_bridge_whitelist(host_b, false)) + if (__host_bridge_whitelist(host_a, false, warn) && + __host_bridge_whitelist(host_b, false, warn)) return true; return false; @@ -485,7 +490,7 @@ calc_map_type_and_dist(struct pci_dev *provider, struct pci_dev *client, if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE) { if (!cpu_supports_p2pdma() && - !host_bridge_whitelist(provider, client)) + !host_bridge_whitelist(provider, client, acs_redirects)) map_type = PCI_P2PDMA_MAP_NOT_SUPPORTED; } |