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PCI: Add #defines for Completion Timeout Disable feature 

Add #defines for the Completion Timeout Disable feature and use them.  No
functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Bjorn Helgaas 2017-12-15 15:31:30 -06:00 committed by Bjorn Helgaas
parent 3203e1d96c
commit fdabc3fe99
2 changed files with 5 additions and 3 deletions
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6
arch/powerpc/platforms/powernv/eeh-powernv.c
View File

@ -1654,14 +1654,14 @@ static int pnv_eeh_restore_vf_config(struct pci_dn *pdn)
eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
2, devctl);
/* Disable Completion Timeout */
/* Disable Completion Timeout if possible */
eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCAP2,
4, &cap2);
if (cap2 & 0x10) {
if (cap2 & PCI_EXP_DEVCAP2_COMP_TMOUT_DIS) {
eeh_ops->read_config(pdn,
edev->pcie_cap + PCI_EXP_DEVCTL2,
4, &cap2);
cap2 |= 0x10;
cap2 |= PCI_EXP_DEVCTL2_COMP_TMOUT_DIS;
eeh_ops->write_config(pdn,
edev->pcie_cap + PCI_EXP_DEVCTL2,
4, cap2);

2
include/uapi/linux/pci_regs.h
View File

@ -622,6 +622,7 @@
* safely.
*/
#define PCI_EXP_DEVCAP2 36 /* Device Capabilities 2 */
#define PCI_EXP_DEVCAP2_COMP_TMOUT_DIS 0x00000010 /* Completion Timeout Disable supported */
#define PCI_EXP_DEVCAP2_ARI 0x00000020 /* Alternative Routing-ID */
#define PCI_EXP_DEVCAP2_ATOMIC_ROUTE 0x00000040 /* Atomic Op routing */
#define PCI_EXP_DEVCAP2_ATOMIC_COMP64 0x00000100 /* Atomic 64-bit compare */
@ -631,6 +632,7 @@
#define PCI_EXP_DEVCAP2_OBFF_WAKE 0x00080000 /* Re-use WAKE# for OBFF */
#define PCI_EXP_DEVCTL2 40 /* Device Control 2 */
#define PCI_EXP_DEVCTL2_COMP_TIMEOUT 0x000f /* Completion Timeout Value */
#define PCI_EXP_DEVCTL2_COMP_TMOUT_DIS 0x0010 /* Completion Timeout Disable */
#define PCI_EXP_DEVCTL2_ARI 0x0020 /* Alternative Routing-ID */
#define PCI_EXP_DEVCTL2_ATOMIC_REQ 0x0040 /* Set Atomic requests */
#define PCI_EXP_DEVCTL2_ATOMIC_EGRESS_BLOCK 0x0080 /* Block atomic egress */