svn commit: r205489 - stable/7/sys/dev/pci

[Pyun YongHyeon]

Author: yongari
Date: Mon Mar 22 23:15:19 2010
New Revision: 205489
URL: http://svn.freebsd.org/changeset/base/205489

Log:
  MFC r203528:
    Add pci_get|set_max_read_req() helper functions to control maximum PCIe
    read request size.

Modified:
  stable/7/sys/dev/pci/pci.c
  stable/7/sys/dev/pci/pcivar.h
Directory Properties:
  stable/7/sys/   (props changed)
  stable/7/sys/cddl/contrib/opensolaris/   (props changed)
  stable/7/sys/contrib/dev/acpica/   (props changed)
  stable/7/sys/contrib/pf/   (props changed)

Modified: stable/7/sys/dev/pci/pci.c
==============================================================================
--- stable/7/sys/dev/pci/pci.c	Mon Mar 22 23:04:12 2010	(r205488)
+++ stable/7/sys/dev/pci/pci.c	Mon Mar 22 23:15:19 2010	(r205489)
@@ -1564,6 +1564,40 @@ 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/7/sys/dev/pci/pcivar.h
==============================================================================
--- stable/7/sys/dev/pci/pcivar.h	Mon Mar 22 23:04:12 2010	(r205488)
+++ stable/7/sys/dev/pci/pcivar.h	Mon Mar 22 23:15:19 2010	(r205489)
@@ -465,6 +465,9 @@ 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_ */
 
 /*