diff options
Diffstat (limited to 'sys/dev/pci')
| -rw-r--r-- | sys/dev/pci/pci.c | 34 | ||||
| -rw-r--r-- | sys/dev/pci/pcivar.h | 3 |
2 files changed, 37 insertions, 0 deletions
diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c index b76e2e7103b9..650e2141b701 100644 --- a/sys/dev/pci/pci.c +++ b/sys/dev/pci/pci.c @@ -1592,6 +1592,40 @@ pci_ht_map_msi(device_t dev, uint64_t addr) } } +int +pci_get_max_read_req(device_t dev) +{ + int cap; + uint16_t val; + + if (pci_find_extcap(dev, PCIY_EXPRESS, &cap) != 0) + return (0); + val = pci_read_config(dev, cap + PCIR_EXPRESS_DEVICE_CTL, 2); + val &= PCIM_EXP_CTL_MAX_READ_REQUEST; + val >>= 12; + return (1 << (val + 7)); +} + +int +pci_set_max_read_req(device_t dev, int size) +{ + int cap; + uint16_t val; + + if (pci_find_extcap(dev, PCIY_EXPRESS, &cap) != 0) + return (0); + if (size < 128) + size = 128; + if (size > 4096) + size = 4096; + size = (1 << (fls(size) - 1)); + val = pci_read_config(dev, cap + PCIR_EXPRESS_DEVICE_CTL, 2); + val &= ~PCIM_EXP_CTL_MAX_READ_REQUEST; + val |= (fls(size) - 8) << 12; + pci_write_config(dev, cap + PCIR_EXPRESS_DEVICE_CTL, val, 2); + return (size); +} + /* * Support for MSI message signalled interrupts. */ diff --git a/sys/dev/pci/pcivar.h b/sys/dev/pci/pcivar.h index d7de96e65625..948370813e2d 100644 --- a/sys/dev/pci/pcivar.h +++ b/sys/dev/pci/pcivar.h @@ -458,6 +458,9 @@ int pci_msi_device_blacklisted(device_t dev); void pci_ht_map_msi(device_t dev, uint64_t addr); +int pci_get_max_read_req(device_t dev); +int pci_set_max_read_req(device_t dev, int size); + #endif /* _SYS_BUS_H_ */ /* |