PERFORCE change 171561 for review

[Alexander Motin]

http://p4web.freebsd.org/chv.cgi?CH=171561

Change 171561 by mav at mav_mavtest on 2009/12/09 11:20:05

	Increase Max Read Request Size for PCIe chips to 1024 bytes.
	It gives those slow beasts additional 10% of write bandwidth.

Affected files ...

.. //depot/projects/scottl-camlock/src/sys/dev/siis/siis.c#30 edit

Differences ...

==== //depot/projects/scottl-camlock/src/sys/dev/siis/siis.c#30 (text+ko) ====

@@ -231,7 +231,20 @@
 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);