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Chelsio T5 chips do not properly echo the No Snoop and Relaxed Ordering

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attributes when replying to a TLP from a Root Port.  As a workaround,
disable No Snoop and Relaxed Ordering in the Root Port of each T5 adapter
during attach so that CPU-initiated requests do not contain these flags.

Note that this affects CPU-initiated requests to all devices under this
root port.

Reviewed by:	np
MFC after:	1 week
Sponsored by:	Chelsio
This commit is contained in:
John Baldwin 2015-11-05 21:33:15 +00:00
parent 87dd2f95d2
commit 02da5bb12a
1 changed files with 29 additions and 0 deletions
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29
sys/dev/cxgbe/t4_main.c
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@ -573,6 +573,33 @@ t5_probe(device_t dev)
return (ENXIO);
}
static void
t5_attribute_workaround(device_t dev)
{
device_t root_port;
uint32_t v;
/*
* The T5 chips do not properly echo the No Snoop and Relaxed
* Ordering attributes when replying to a TLP from a Root
* Port. As a workaround, find the parent Root Port and
* disable No Snoop and Relaxed Ordering. Note that this
* affects all devices under this root port.
*/
root_port = pci_find_pcie_root_port(dev);
if (root_port == NULL) {
device_printf(dev, "Unable to find parent root port\n");
return;
}
v = pcie_adjust_config(root_port, PCIER_DEVICE_CTL,
PCIEM_CTL_RELAXED_ORD_ENABLE | PCIEM_CTL_NOSNOOP_ENABLE, 0, 2);
if ((v & (PCIEM_CTL_RELAXED_ORD_ENABLE | PCIEM_CTL_NOSNOOP_ENABLE)) !=
0)
device_printf(dev, "Disabled No Snoop/Relaxed Ordering on %s\n",
device_get_nameunit(root_port));
}
static int
t4_attach(device_t dev)
{
@ -591,6 +618,8 @@ t4_attach(device_t dev)
sc->dev = dev;
TUNABLE_INT_FETCH("hw.cxgbe.debug_flags", &sc->debug_flags);
if ((pci_get_device(dev) & 0xff00) == 0x5400)
t5_attribute_workaround(dev);
pci_enable_busmaster(dev);
if (pci_find_cap(dev, PCIY_EXPRESS, &i) == 0) {
uint32_t v;