[PATCH 01/15] pcie: Set default and supported MaxReadReq to 512

[Lukasz Maniak <lukasz.maniak@linux.intel.com>]

From: Knut Omang <knut.omang@oracle.com>

Make the default PCI Express Capability for PCIe devices set
MaxReadReq to 512. Tyipcal modern devices people would want to
emulate or simulate would want this. The previous value would
cause warnings from the root port driver on some kernels.

Signed-off-by: Knut Omang <knuto@ifi.uio.no>
---
 hw/pci/pcie.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 6e95d82903..c1a12f3744 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -62,8 +62,9 @@ pcie_cap_v1_fill(PCIDevice *dev, uint8_t port, uint8_t type, uint8_t version)
      * Functions conforming to the ECN, PCI Express Base
      * Specification, Revision 1.1., or subsequent PCI Express Base
      * Specification revisions.
+     *  + set max payload size to 256, which seems to be a common value
      */
-    pci_set_long(exp_cap + PCI_EXP_DEVCAP, PCI_EXP_DEVCAP_RBER);
+    pci_set_long(exp_cap + PCI_EXP_DEVCAP, PCI_EXP_DEVCAP_RBER | (0x1 & PCI_EXP_DEVCAP_PAYLOAD));
 
     pci_set_long(exp_cap + PCI_EXP_LNKCAP,
                  (port << PCI_EXP_LNKCAP_PN_SHIFT) |
@@ -179,6 +180,8 @@ int pcie_cap_init(PCIDevice *dev, uint8_t offset,
     pci_set_long(exp_cap + PCI_EXP_DEVCAP2,
                  PCI_EXP_DEVCAP2_EFF | PCI_EXP_DEVCAP2_EETLPP);
 
+    pci_set_word(exp_cap + PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_READRQ_256B);
+
     pci_set_word(dev->wmask + pos + PCI_EXP_DEVCTL2, PCI_EXP_DEVCTL2_EETLPPB);
 
     if (dev->cap_present & QEMU_PCIE_EXTCAP_INIT) {
-- 
2.25.1