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cxl: Ignore CAPI adapters misplaced in switched slots

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One should not attempt to switch a PHB into CAPI mode if there is
a switch between the PHB and the adapter. This patch modifies the
cxl driver to ignore CAPI adapters misplaced in switched slots.

Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Philippe Bergheaud 2016-07-01 13:32:52 +02:00 committed by Michael Ellerman
parent e00878be3f
commit 3b3dcd61fa
1 changed files with 29 additions and 0 deletions
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29
drivers/misc/cxl/pci.c
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@ -1402,6 +1402,30 @@ static void cxl_pci_remove_adapter(struct cxl *adapter)
device_unregister(&adapter->dev);
}
#define CXL_MAX_PCIEX_PARENT 2
static int cxl_slot_is_switched(struct pci_dev *dev)
{
struct device_node *np;
int depth = 0;
const __be32 *prop;
if (!(np = pci_device_to_OF_node(dev))) {
pr_err("cxl: np = NULL\n");
return -ENODEV;
}
of_node_get(np);
while (np) {
np = of_get_next_parent(np);
prop = of_get_property(np, "device_type", NULL);
if (!prop || strcmp((char *)prop, "pciex"))
break;
depth++;
}
of_node_put(np);
return (depth > CXL_MAX_PCIEX_PARENT);
}
static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct cxl *adapter;
@ -1413,6 +1437,11 @@ static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id)
return -ENODEV;
}
if (cxl_slot_is_switched(dev)) {
dev_info(&dev->dev, "Ignoring card on incompatible PCI slot\n");
return -ENODEV;
}
if (cxl_verbose)
dump_cxl_config_space(dev);