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path: root/drivers/vfio
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-rw-r--r--drivers/vfio/pci/vfio_pci_config.c70
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]);