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pci: add tunable hw.pci.enable_mps_tune

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If the tunable is set to 0, the tuning of the MPS (maximum payload size)
is disabled and the default MPS values set by the BIOS are used. In this
case the system may use a lower speed or operate in a less optimized
state, but it can resolve issues with stability and compatibility. With
specific devices the tuning of the mps, can lead to a complete freeze of
the system.

Reviewed by:		manu
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D38397
This commit is contained in:
Corvin Köhne 2023-02-06 09:26:33 +00:00
parent f4ceaff56d
commit 48d70503bc
No known key found for this signature in database
GPG Key ID: D854DA56315E026A
1 changed files with 7 additions and 1 deletions
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8
sys/dev/pci/pci.c
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@ -420,6 +420,11 @@ SYSCTL_INT(_hw_pci, OID_AUTO, clear_aer_on_attach, CTLFLAG_RWTUN,
&pci_clear_aer_on_attach, 0,
"Clear port and device AER state on driver attach");
static bool pci_enable_mps_tune = true;
SYSCTL_BOOL(_hw_pci, OID_AUTO, enable_mps_tune, CTLFLAG_RWTUN,
&pci_enable_mps_tune, 1,
"Enable tuning of MPS(maximum payload size)." );
static int
pci_has_quirk(uint32_t devid, int quirk)
{
@ -4452,7 +4457,8 @@ pci_add_child(device_t bus, struct pci_devinfo *dinfo)
pci_cfg_restore(dev, dinfo);
pci_print_verbose(dinfo);
pci_add_resources(bus, dev, 0, 0);
pcie_setup_mps(dev);
if (pci_enable_mps_tune)
pcie_setup_mps(dev);
pci_child_added(dinfo->cfg.dev);
if (pci_clear_aer_on_attach)