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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] MSI 4/6: remove io_mem permission for MSI-X, since MSI-X
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1209634330 -3600
# Node ID a0ebceaf41ff8ebda5e2478c03fd6e382ddc4b7f
# Parent 86c0353f19d03ec79d352074a54d94863d2dac4c
MSI 4/6: remove io_mem permission for MSI-X, since MSI-X
facilities are allocted through and located in PCI BAR.
Signed-off-by: Jiang Yunhong <yunhong.jiang@xxxxxxxxx>
Signed-off-by: Shan Haitao <haitao.shan@xxxxxxxxx>
---
tools/python/xen/util/pci.py | 85 +++++++++++++++++++++++++++++++++-
tools/python/xen/xend/server/pciif.py | 13 +++++
2 files changed, 96 insertions(+), 2 deletions(-)
diff -r 86c0353f19d0 -r a0ebceaf41ff tools/python/xen/util/pci.py
--- a/tools/python/xen/util/pci.py Thu May 01 10:31:29 2008 +0100
+++ b/tools/python/xen/util/pci.py Thu May 01 10:32:10 2008 +0100
@@ -7,6 +7,7 @@
import sys
import os, os.path
+import resource
PROC_MNT_PATH = '/proc/mounts'
PROC_PCI_PATH = '/proc/bus/pci/devices'
@@ -14,6 +15,7 @@ PROC_PCI_NUM_RESOURCES = 7
SYSFS_PCI_DEVS_PATH = '/bus/pci/devices'
SYSFS_PCI_DEV_RESOURCE_PATH = '/resource'
+SYSFS_PCI_DEV_CONFIG_PATH = '/config'
SYSFS_PCI_DEV_IRQ_PATH = '/irq'
SYSFS_PCI_DEV_DRIVER_DIR_PATH = '/driver'
SYSFS_PCI_DEV_VENDOR_PATH = '/vendor'
@@ -24,7 +26,20 @@ PCI_BAR_IO = 0x01
PCI_BAR_IO = 0x01
PCI_BAR_IO_MASK = ~0x03
PCI_BAR_MEM_MASK = ~0x0f
-
+PCI_STATUS_CAP_MASK = 0x10
+PCI_STATUS_OFFSET = 0x6
+PCI_CAP_OFFSET = 0x34
+MSIX_BIR_MASK = 0x7
+
+#Calculate PAGE_SHIFT: number of bits to shift an address to get the page
number
+PAGE_SIZE = resource.getpagesize()
+PAGE_SHIFT = 0
+t = PAGE_SIZE
+while not (t&1):
+ t>>=1
+ PAGE_SHIFT+=1
+
+PAGE_MASK=~(PAGE_SIZE - 1)
# Definitions from Linux: include/linux/pci.h
def PCI_DEVFN(slot, func):
return ((((slot) & 0x1f) << 3) | ((func) & 0x07))
@@ -74,10 +89,72 @@ class PciDevice:
self.device = None
self.subvendor = None
self.subdevice = None
-
+ self.msix = 0
+ self.msix_iomem = []
self.get_info_from_sysfs()
+ def find_capability(self, type):
+ try:
+ sysfs_mnt = find_sysfs_mnt()
+ except IOError, (errno, strerr):
+ raise PciDeviceParseError(('Failed to locate sysfs mount: %s (%d)'
%
+ (PROC_PCI_PATH, strerr, errno)))
+
+ if sysfs_mnt == None:
+ return False
+ path = sysfs_mnt+SYSFS_PCI_DEVS_PATH+'/'+ \
+ self.name+SYSFS_PCI_DEV_CONFIG_PATH
+ try:
+ conf_file = open(path, 'rb')
+ conf_file.seek(PCI_STATUS_OFFSET)
+ status = ord(conf_file.read(1))
+ if status&PCI_STATUS_CAP_MASK:
+ conf_file.seek(PCI_CAP_OFFSET)
+ capa_pointer = ord(conf_file.read(1))
+ while capa_pointer:
+ conf_file.seek(capa_pointer)
+ capa_id = ord(conf_file.read(1))
+ capa_pointer = ord(conf_file.read(1))
+ if capa_id == type:
+ # get the type
+ message_cont_lo = ord(conf_file.read(1))
+ message_cont_hi = ord(conf_file.read(1))
+ self.msix=1
+ self.msix_entries = message_cont_lo + \
+ message_cont_hi << 8
+ t_off=conf_file.read(4)
+ p_off=conf_file.read(4)
+ self.table_offset=ord(t_off[0]) | (ord(t_off[1])<<8) |
\
+ (ord(t_off[2])<<16)| \
+ (ord(t_off[3])<<24)
+ self.pba_offset=ord(p_off[0]) | (ord(p_off[1]) << 8)| \
+ (ord(p_off[2])<<16) | \
+ (ord(p_off[3])<<24)
+ self.table_index = self.table_offset & MSIX_BIR_MASK
+ self.table_offset = self.table_offset & ~MSIX_BIR_MASK
+ self.pba_index = self.pba_offset & MSIX_BIR_MASK
+ self.pba_offset = self.pba_offset & ~MSIX_BIR_MASK
+ break
+ except IOError, (errno, strerr):
+ raise PciDeviceParseError(('Failed to locate sysfs mount: %s (%d)'
%
+ (PROC_PCI_PATH, strerr, errno)))
+
+ def remove_msix_iomem(self, index, start, size):
+ if (index == self.table_index):
+ table_start = start+self.table_offset
+ table_end = table_start + self.msix_entries * 16
+ table_start = table_start & PAGE_MASK
+ table_end = (table_end + PAGE_SIZE) & PAGE_MASK
+ self.msix_iomem.append((table_start, table_end-table_start))
+ if (index==self.pba_index):
+ pba_start = start + self.pba_offset
+ pba_end = pba_start + self.msix_entries/8
+ pba_start = pba_start & PAGE_MASK
+ pba_end = (pba_end + PAGE_SIZE) & PAGE_MASK
+ self.msix_iomem.append((pba_start, pba_end-pba_start))
+
def get_info_from_sysfs(self):
+ self.find_capability(0x11)
try:
sysfs_mnt = find_sysfs_mnt()
except IOError, (errno, strerr):
@@ -108,6 +185,10 @@ class PciDevice:
self.ioports.append( (start,size) )
else:
self.iomem.append( (start,size) )
+ if (self.msix):
+ self.remove_msix_iomem(i, start, size)
+
+
except IOError, (errno, strerr):
raise PciDeviceParseError(('Failed to open & read %s: %s (%d)' %
diff -r 86c0353f19d0 -r a0ebceaf41ff tools/python/xen/xend/server/pciif.py
--- a/tools/python/xen/xend/server/pciif.py Thu May 01 10:31:29 2008 +0100
+++ b/tools/python/xen/xend/server/pciif.py Thu May 01 10:32:10 2008 +0100
@@ -277,6 +277,19 @@ class PciController(DevController):
if rc < 0:
raise VmError(('pci: failed to map irq on device '+
'%s - errno=%d')%(dev.name,rc))
+
+ if dev.msix:
+ for (start, size) in dev.msix_iomem:
+ start_pfn = start>>PAGE_SHIFT
+ nr_pfns = (size+(PAGE_SIZE-1))>>PAGE_SHIFT
+ log.debug('pci-msix: remove permission for 0x%x/0x%x
0x%x/0x%x' % \
+ (start,size, start_pfn, nr_pfns))
+ rc = xc.domain_iomem_permission(domid = fe_domid,
+ first_pfn = start_pfn,
+ nr_pfns = nr_pfns,
+ allow_access = False)
+ if rc<0:
+ raise VmError(('pci: failed to remove msi-x iomem'))
if dev.irq>0:
log.debug('pci: enabling irq %d'%dev.irq)
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