liquidio: fix crash in presence of zeroed-out base address regs

Fix crash in linux PF driver when BARs have been cleared/de-programmed;
fail early init (prior to mapping BARs) if the BAR0 or
BAR1 registers are zero.

This situation can arise when the PF is added to a VM (PCI pass-through),
then a PF FLR is issued (in the VM).  After this occurs, the BAR registers
will be zero. If we attempt to load the PF driver in the host
(after VM has been shutdown), the host can reset.

Signed-off-by: Rick Farrington <ricardo.farrington@cavium.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c b/drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c
index f6c0bad78cd412f9e850eeb9dacc385ad1b7ecf5..e8b290473ee25fe3c6f5b9683c86b87254d3767b 100644 (file)
--- a/drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c
+++ b/drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c
@@ -1305,6 +1305,26 @@ static int cn23xx_sriov_config(struct octeon_device *oct)
 
 int setup_cn23xx_octeon_pf_device(struct octeon_device *oct)
 {
+       u32 data32;
+       u64 BAR0, BAR1;
+
+       pci_read_config_dword(oct->pci_dev, PCI_BASE_ADDRESS_0, &data32);
+       BAR0 = (u64)(data32 & ~0xf);
+       pci_read_config_dword(oct->pci_dev, PCI_BASE_ADDRESS_1, &data32);
+       BAR0 |= ((u64)data32 << 32);
+       pci_read_config_dword(oct->pci_dev, PCI_BASE_ADDRESS_2, &data32);
+       BAR1 = (u64)(data32 & ~0xf);
+       pci_read_config_dword(oct->pci_dev, PCI_BASE_ADDRESS_3, &data32);
+       BAR1 |= ((u64)data32 << 32);
+
+       if (!BAR0 || !BAR1) {
+               if (!BAR0)
+                       dev_err(&oct->pci_dev->dev, "device BAR0 unassigned\n");
+               if (!BAR1)
+                       dev_err(&oct->pci_dev->dev, "device BAR1 unassigned\n");
+               return 1;
+       }
+
        if (octeon_map_pci_barx(oct, 0, 0))
                return 1;