summaryrefslogtreecommitdiff
path: root/drivers/pci
diff options
context:
space:
mode:
authorMyron Stowe <myron.stowe@redhat.com>2018-08-13 21:19:46 +0300
committerBjorn Helgaas <bhelgaas@google.com>2018-08-14 17:09:33 +0300
commit9f0e89359775ee21fe1ea732e34edb52aef5addf (patch)
treea20e2bfb12626b4bc68374cebbf1c5273a648771 /drivers/pci
parent3dbe97efe8bf450b183d6dee2305cbc032e6b8a4 (diff)
downloadlinux-9f0e89359775ee21fe1ea732e34edb52aef5addf.tar.xz
PCI: Match Root Port's MPS to endpoint's MPSS as necessary
In commit 27d868b5e6cf ("PCI: Set MPS to match upstream bridge"), we made sure every device's MPS setting matches its upstream bridge, making it more likely that a hot-added device will work in a system with an optimized MPS configuration. Recently I've started encountering systems where the endpoint device's MPSS capability is less than its Root Port's current MPS value, thus the endpoint is not capable of matching its upstream bridge's MPS setting (see: bugzilla via "Link:" below). This leaves the system vulnerable - the upstream Root Port could respond with larger TLPs than the device can handle, and the device will consider them to be 'Malformed'. One could use the "pci=pcie_bus_safe" kernel parameter to work around the issue, but that forces a user to supply a kernel parameter to get the system to function reliably and may end up limiting MPS settings of other unrelated, sub-topologies which could benefit from maintaining their larger values. Augment Keith's approach to include tuning down a Root Port's MPS setting when its hot-added endpoint device is not capable of matching it. Link: https://bugzilla.kernel.org/show_bug.cgi?id=200527 Signed-off-by: Myron Stowe <myron.stowe@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Jon Mason <jdmason@kudzu.us> Cc: Keith Busch <keith.busch@intel.com> Cc: Sinan Kaya <okaya@kernel.org> Cc: Dongdong Liu <liudongdong3@huawei.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/probe.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index c2533ed45fff..bca6d2741969 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1725,7 +1725,7 @@ int pci_setup_device(struct pci_dev *dev)
static void pci_configure_mps(struct pci_dev *dev)
{
struct pci_dev *bridge = pci_upstream_bridge(dev);
- int mps, p_mps, rc;
+ int mps, mpss, p_mps, rc;
if (!pci_is_pcie(dev) || !bridge || !pci_is_pcie(bridge))
return;
@@ -1753,6 +1753,14 @@ static void pci_configure_mps(struct pci_dev *dev)
if (pcie_bus_config != PCIE_BUS_DEFAULT)
return;
+ mpss = 128 << dev->pcie_mpss;
+ if (mpss < p_mps && pci_pcie_type(bridge) == PCI_EXP_TYPE_ROOT_PORT) {
+ pcie_set_mps(bridge, mpss);
+ pci_info(dev, "Upstream bridge's Max Payload Size set to %d (was %d, max %d)\n",
+ mpss, p_mps, 128 << bridge->pcie_mpss);
+ p_mps = pcie_get_mps(bridge);
+ }
+
rc = pcie_set_mps(dev, p_mps);
if (rc) {
pci_warn(dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
@@ -1761,7 +1769,7 @@ static void pci_configure_mps(struct pci_dev *dev)
}
pci_info(dev, "Max Payload Size set to %d (was %d, max %d)\n",
- p_mps, mps, 128 << dev->pcie_mpss);
+ p_mps, mps, mpss);
}
static struct hpp_type0 pci_default_type0 = {