diff options
| -rw-r--r-- | drivers/vfio/pci/vfio_pci_config.c | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c index ff75ca31a199..a8657ef6382f 100644 --- a/drivers/vfio/pci/vfio_pci_config.c +++ b/drivers/vfio/pci/vfio_pci_config.c @@ -671,6 +671,73 @@ static int __init init_pci_cap_pm_perm(struct perm_bits *perm) return 0; } +static int vfio_vpd_config_write(struct vfio_pci_device *vdev, int pos, + int count, struct perm_bits *perm, + int offset, __le32 val) +{ + struct pci_dev *pdev = vdev->pdev; + __le16 *paddr = (__le16 *)(vdev->vconfig + pos - offset + PCI_VPD_ADDR); + __le32 *pdata = (__le32 *)(vdev->vconfig + pos - offset + PCI_VPD_DATA); + u16 addr; + u32 data; + + /* + * Write through to emulation. If the write includes the upper byte + * of PCI_VPD_ADDR, then the PCI_VPD_ADDR_F bit is written and we + * have work to do. + */ + count = vfio_default_config_write(vdev, pos, count, perm, offset, val); + if (count < 0 || offset > PCI_VPD_ADDR + 1 || + offset + count <= PCI_VPD_ADDR + 1) + return count; + + addr = le16_to_cpu(*paddr); + + if (addr & PCI_VPD_ADDR_F) { + data = le32_to_cpu(*pdata); + if (pci_write_vpd(pdev, addr & ~PCI_VPD_ADDR_F, 4, &data) != 4) + return count; + } else { + if (pci_read_vpd(pdev, addr, 4, &data) != 4) + return count; + *pdata = cpu_to_le32(data); + } + + /* + * Toggle PCI_VPD_ADDR_F in the emulated PCI_VPD_ADDR register to + * signal completion. If an error occurs above, we assume that not + * toggling this bit will induce a driver timeout. + */ + addr ^= PCI_VPD_ADDR_F; + *paddr = cpu_to_le16(addr); + + return count; +} + +/* Permissions for Vital Product Data capability */ +static int __init init_pci_cap_vpd_perm(struct perm_bits *perm) +{ + if (alloc_perm_bits(perm, pci_cap_length[PCI_CAP_ID_VPD])) + return -ENOMEM; + + perm->writefn = vfio_vpd_config_write; + + /* + * We always virtualize the next field so we can remove + * capabilities from the chain if we want to. + */ + p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE); + + /* + * Both the address and data registers are virtualized to + * enable access through the pci_vpd_read/write functions + */ + p_setw(perm, PCI_VPD_ADDR, (u16)ALL_VIRT, (u16)ALL_WRITE); + p_setd(perm, PCI_VPD_DATA, ALL_VIRT, ALL_WRITE); + + return 0; +} + /* Permissions for PCI-X capability */ static int __init init_pci_cap_pcix_perm(struct perm_bits *perm) { @@ -790,6 +857,7 @@ void vfio_pci_uninit_perm_bits(void) free_perm_bits(&cap_perms[PCI_CAP_ID_BASIC]); free_perm_bits(&cap_perms[PCI_CAP_ID_PM]); + free_perm_bits(&cap_perms[PCI_CAP_ID_VPD]); free_perm_bits(&cap_perms[PCI_CAP_ID_PCIX]); free_perm_bits(&cap_perms[PCI_CAP_ID_EXP]); free_perm_bits(&cap_perms[PCI_CAP_ID_AF]); @@ -807,7 +875,7 @@ int __init vfio_pci_init_perm_bits(void) /* Capabilities */ ret |= init_pci_cap_pm_perm(&cap_perms[PCI_CAP_ID_PM]); - cap_perms[PCI_CAP_ID_VPD].writefn = vfio_raw_config_write; + ret |= init_pci_cap_vpd_perm(&cap_perms[PCI_CAP_ID_VPD]); ret |= init_pci_cap_pcix_perm(&cap_perms[PCI_CAP_ID_PCIX]); cap_perms[PCI_CAP_ID_VNDR].writefn = vfio_raw_config_write; ret |= init_pci_cap_exp_perm(&cap_perms[PCI_CAP_ID_EXP]); |