Date: Fri, 19 Feb 2010 18:07:51 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r204098 - stable/8/sys/dev/pci Message-ID: <201002191807.o1JI7pg6059635@svn.freebsd.org>
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Author: mav Date: Fri Feb 19 18:07:51 2010 New Revision: 204098 URL: http://svn.freebsd.org/changeset/base/204098 Log: MFC r203528: Add pci_get|set_max_read_req() helper functions to control maximum PCIe read request size. Modified: stable/8/sys/dev/pci/pci.c stable/8/sys/dev/pci/pcivar.h Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) stable/8/sys/dev/xen/xenpci/ (props changed) stable/8/sys/netinet/ (props changed) Modified: stable/8/sys/dev/pci/pci.c ============================================================================== --- stable/8/sys/dev/pci/pci.c Fri Feb 19 18:01:32 2010 (r204097) +++ stable/8/sys/dev/pci/pci.c Fri Feb 19 18:07:51 2010 (r204098) @@ -1592,6 +1592,40 @@ pci_ht_map_msi(device_t dev, uint64_t ad } } +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. */ Modified: stable/8/sys/dev/pci/pcivar.h ============================================================================== --- stable/8/sys/dev/pci/pcivar.h Fri Feb 19 18:01:32 2010 (r204097) +++ stable/8/sys/dev/pci/pcivar.h Fri Feb 19 18:07:51 2010 (r204098) @@ -458,6 +458,9 @@ int pci_msi_device_blacklisted(device_t 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_ */ /*
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