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_ */
/*
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