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PCI: Move MPS configuration check to pci_configure_device()

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Previously we checked for invalid MPS settings, i.e., a device with MPS
different than its upstream bridge, in pcie_bus_detect_mps().  We only did
this if the arch or hotplug driver called pcie_bus_configure_settings(),
and then only if PCIe bus tuning was disabled (PCIE_BUS_TUNE_OFF).

Move the MPS checking code to pci_configure_device(), so we do it in the
pci_device_add() path for every device.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2015-08-20 16:08:27 -05:00
parent 3a10766d06
commit 9dae3a9729
1 changed files with 24 additions and 19 deletions
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43
drivers/pci/probe.c
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@ -1275,6 +1275,27 @@ int pci_setup_device(struct pci_dev *dev)
return 0;
}
static void pci_configure_mps(struct pci_dev *dev)
{
struct pci_dev *bridge = pci_upstream_bridge(dev);
int mps, p_mps;
if (!pci_is_pcie(dev) || !bridge || !pci_is_pcie(bridge))
return;
mps = pcie_get_mps(dev);
p_mps = pcie_get_mps(bridge);
if (mps == p_mps)
return;
if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
mps, pci_name(bridge), p_mps);
return;
}
}
static struct hpp_type0 pci_default_type0 = {
.revision = 1,
.cache_line_size = 8,
@ -1396,6 +1417,8 @@ static void pci_configure_device(struct pci_dev *dev)
struct hotplug_params hpp;
int ret;
pci_configure_mps(dev);
memset(&hpp, 0, sizeof(hpp));
ret = pci_get_hp_params(dev, &hpp);
if (ret)
@ -1791,22 +1814,6 @@ static void pcie_write_mrrs(struct pci_dev *dev)
dev_err(&dev->dev, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n");
}
static void pcie_bus_detect_mps(struct pci_dev *dev)
{
struct pci_dev *bridge = dev->bus->self;
int mps, p_mps;
if (!bridge)
return;
mps = pcie_get_mps(dev);
p_mps = pcie_get_mps(bridge);
if (mps != p_mps)
dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
mps, pci_name(bridge), p_mps);
}
static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
{
int mps, orig_mps;
@ -1814,10 +1821,8 @@ static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
if (!pci_is_pcie(dev))
return 0;
if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
pcie_bus_detect_mps(dev);
if (pcie_bus_config == PCIE_BUS_TUNE_OFF)
return 0;
}
mps = 128 << *(u8 *)data;
orig_mps = pcie_get_mps(dev);