Date: Wed, 9 Dec 2009 13:10:10 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r200291 - head/sys/dev/siis Message-ID: <200912091310.nB9DAAMG026005@svn.freebsd.org>
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Author: mav Date: Wed Dec 9 13:10:10 2009 New Revision: 200291 URL: http://svn.freebsd.org/changeset/base/200291 Log: Increase Max Read Request Size for PCIe chips from 512 to 1024 bytes. It gives those beasts additional 10% of write bandwidth. Modified: head/sys/dev/siis/siis.c Modified: head/sys/dev/siis/siis.c ============================================================================== --- head/sys/dev/siis/siis.c Wed Dec 9 11:00:00 2009 (r200290) +++ head/sys/dev/siis/siis.c Wed Dec 9 13:10:10 2009 (r200291) @@ -231,7 +231,20 @@ static int siis_resume(device_t dev) { struct siis_controller *ctlr = device_get_softc(dev); + int cap; + uint16_t val; + /* Set PCIe max read request size to at least 1024 bytes */ + if (pci_find_extcap(dev, PCIY_EXPRESS, &cap) == 0) { + val = pci_read_config(dev, + cap + PCIR_EXPRESS_DEVICE_CTL, 2); + if ((val & PCIM_EXP_CTL_MAX_READ_REQUEST) < 0x3000) { + val &= ~PCIM_EXP_CTL_MAX_READ_REQUEST; + val |= 0x3000; + pci_write_config(dev, + cap + PCIR_EXPRESS_DEVICE_CTL, val, 2); + } + } /* Put controller into reset state. */ ctlr->gctl |= SIIS_GCTL_GRESET; ATA_OUTL(ctlr->r_gmem, SIIS_GCTL, ctlr->gctl);
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