This patch removes Xend method which saves/restores PCI configuration
space.
And this patch modifies the timing of saving/restoring configuration
space like below.
When pciback is bound to devices.
- Pciback saves configuration space.
When pciback is unbound to devices.
- Pciback restores configuration space.
When guest OS boots or a device is hotadded.
- Pciback restores configuration space.
- Pciback changes state of backend device to Initialised/Reconfigured.
- Xend waits for the transition to Initialised/Reconfigured.
When guest OS shutdowns or a device is hotremoved.
- Pciback restores configuration space.
- Xend resets devices.
* If D-state of the device is not D0, the state is changed to D0
before resetting the device.
- Xend deassigns devices.
* Essentially, devices should be reset before configuration space is
restored. But it needs big modifications. Applying these patches,
configuration space is restored when guest OS boots, a device is
hotadded or pciback is unbound. So it has no matter.
Thanks,
--
Yuji Shimada
Signed-off-by: Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>
diff -r 94ffd85005c5 tools/python/xen/util/pci.py
--- a/tools/python/xen/util/pci.py Tue Apr 14 15:23:53 2009 +0100
+++ b/tools/python/xen/util/pci.py Tue Apr 21 16:51:20 2009 +0900
@@ -70,6 +70,7 @@
PCI_PM_CTRL_NO_SOFT_RESET = 0x0008
PCI_PM_CTRL_STATE_MASK = 0x0003
PCI_D3hot = 3
+PCI_D2 = 2
PCI_D0hot = 0
VENDOR_INTEL = 0x8086
@@ -209,33 +210,6 @@
finally:
lspci_info_lock.release()
-def save_pci_conf_space(devs_string):
- pci_list = []
- cfg_list = []
- sysfs_mnt = find_sysfs_mnt()
- for pci_str in devs_string:
- pci_path = sysfs_mnt + SYSFS_PCI_DEVS_PATH + '/' + pci_str + \
- SYSFS_PCI_DEV_CONFIG_PATH
- fd = os.open(pci_path, os.O_RDONLY)
- configs = []
- for i in range(0, 256, 4):
- configs = configs + [os.read(fd,4)]
- os.close(fd)
- pci_list = pci_list + [pci_path]
- cfg_list = cfg_list + [configs]
- return (pci_list, cfg_list)
-
-def restore_pci_conf_space(pci_cfg_list):
- pci_list = pci_cfg_list[0]
- cfg_list = pci_cfg_list[1]
- for i in range(0, len(pci_list)):
- pci_path = pci_list[i]
- configs = cfg_list[i]
- fd = os.open(pci_path, os.O_WRONLY)
- for dw in configs:
- os.write(fd, dw)
- os.close(fd)
-
def find_all_devices_owned_by_pciback():
sysfs_mnt = find_sysfs_mnt()
pciback_path = sysfs_mnt + SYSFS_PCIBACK_PATH
@@ -476,9 +450,6 @@
return dev_list
def do_secondary_bus_reset(self, target_bus, devs):
- # Save the config spaces of all the devices behind the bus.
- (pci_list, cfg_list) = save_pci_conf_space(devs)
-
#Do the Secondary Bus Reset
sysfs_mnt = find_sysfs_mnt()
parent_path = sysfs_mnt + SYSFS_PCI_DEVS_PATH + '/' + \
@@ -498,9 +469,6 @@
time.sleep(0.100)
os.close(fd)
- # Restore the config spaces
- restore_pci_conf_space((pci_list, cfg_list))
-
def do_Dstate_transition(self):
pos = self.find_cap_offset(PCI_CAP_ID_PM)
if pos == 0:
@@ -513,8 +481,6 @@
if (pm_ctl & PCI_PM_CTRL_NO_SOFT_RESET) == 1:
return False
- (pci_list, cfg_list) = save_pci_conf_space([self.name])
-
# Enter D3hot
pm_ctl &= ~PCI_PM_CTRL_STATE_MASK
pm_ctl |= PCI_D3hot
@@ -527,9 +493,25 @@
self.pci_conf_write32(pos + PCI_PM_CTRL, pm_ctl)
time.sleep(0.010)
- restore_pci_conf_space((pci_list, cfg_list))
return True
+ def do_Dstate_reset(self):
+ pos = self.find_cap_offset(PCI_CAP_ID_PM)
+ if pos == 0:
+ return
+
+ pm_ctl = self.pci_conf_read32(pos + PCI_PM_CTRL)
+ cur_state = pm_ctl & PCI_PM_CTRL_STATE_MASK
+ if (cur_state) != 0:
+ # From not D0 to D0
+ pm_ctl &= ~PCI_PM_CTRL_STATE_MASK
+ pm_ctl |= PCI_D0hot
+ self.pci_conf_write32(pos + PCI_PM_CTRL, pm_ctl)
+ if cur_state == PCI_D3hot:
+ time.sleep(0.010)
+ if cur_state == PCI_D2:
+ time.sleep(0.0002)
+
def do_vendor_specific_FLR_method(self):
pos = self.find_cap_offset(PCI_CAP_ID_VENDOR_SPECIFIC_CAP)
if pos == 0:
@@ -543,13 +525,9 @@
if class_id != PCI_CLASS_ID_USB:
return
- (pci_list, cfg_list) = save_pci_conf_space([self.name])
-
self.pci_conf_write8(pos + PCI_USB_FLRCTRL, 1)
time.sleep(0.100)
- restore_pci_conf_space((pci_list, cfg_list))
-
def do_FLR_for_integrated_device(self):
if not self.do_Dstate_transition():
self.do_vendor_specific_FLR_method()
@@ -725,15 +703,16 @@
def do_FLR(self):
""" Perform FLR (Functional Level Reset) for the device.
"""
+ # Set power management state to D0
+ self.do_Dstate_reset()
+
if self.dev_type == DEV_TYPE_PCIe_ENDPOINT:
# If PCIe device supports FLR, we use it.
if self.pcie_flr:
- (pci_list, cfg_list) = save_pci_conf_space([self.name])
pos = self.find_cap_offset(PCI_CAP_ID_EXP)
self.pci_conf_write32(pos + PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_FLR)
# We must sleep at least 100ms for the completion of FLR
time.sleep(0.100)
- restore_pci_conf_space((pci_list, cfg_list))
else:
if self.bus == 0:
self.do_FLR_for_integrated_device()
@@ -749,12 +728,10 @@
else:
# For PCI device on host bus, we test "PCI Advanced Capabilities".
if self.bus == 0 and self.pci_af_flr:
- (pci_list, cfg_list) = save_pci_conf_space([self.name])
# We use Advanced Capability to do FLR.
pos = self.find_cap_offset(PCI_CAP_ID_AF)
self.pci_conf_write8(pos + PCI_AF_CTL, PCI_AF_CTL_FLR)
time.sleep(0.100)
- restore_pci_conf_space((pci_list, cfg_list))
else:
if self.bus == 0:
self.do_FLR_for_integrated_device()
diff -r 94ffd85005c5 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py Tue Apr 14 15:23:53 2009 +0100
+++ b/tools/python/xen/xend/XendDomainInfo.py Tue Apr 21 16:51:20 2009 +0900
@@ -764,6 +764,23 @@
return self.getDeviceController(dev_type).sxpr(devid)
+ def pci_device_attach(self, dev_sxp):
+ """PCI device attachment.
+
+ @param dev_sxp: device configuration
+ @type dev_sxp: SXP object (parsed config)
+ """
+ pci_dev = sxp.children(dev_sxp, 'dev')[0]
+ dev_config = self.info.pci_convert_sxp_to_dict(dev_sxp)
+
+ vslot = self.hvm_pci_device_create(dev_config)
+ # Update vslot
+ dev['vslot'] = vslot
+ for n in sxp.children(pci_dev):
+ if(n[0] == 'vslot'):
+ n[1] = vslot
+
+
def pci_device_configure(self, dev_sxp, devid = 0):
"""Configure an existing pci device.
@@ -794,15 +811,7 @@
# Do HVM specific processing
if self.info.is_hvm():
- if pci_state == 'Initialising':
- # HVM PCI device attachment
- vslot = self.hvm_pci_device_create(dev_config)
- # Update vslot
- dev['vslot'] = vslot
- for n in sxp.children(pci_dev):
- if(n[0] == 'vslot'):
- n[1] = vslot
- else:
+ if pci_state == 'Closing':
# HVM PCI device detachment
existing_dev_uuid = sxp.child_value(existing_dev_info, 'uuid')
existing_pci_conf = self.info['devices'][existing_dev_uuid][1]
@@ -829,15 +838,22 @@
# If pci platform does not exist, create and exit.
if existing_dev_info is None:
self.device_create(dev_sxp)
+ if self.info.is_hvm():
+ if pci_state == 'Initialising':
+ # HVM PCI device attachment
+ self.pci_device_attach(dev_sxp)
return True
if self.domid is not None:
# use DevController.reconfigureDevice to change device config
dev_control = self.getDeviceController(dev_class)
dev_uuid = dev_control.reconfigureDevice(devid, dev_config)
- if not self.info.is_hvm():
- # in PV case, wait until backend state becomes connected.
- dev_control.waitForDevice_reconfigure(devid)
+ dev_control.waitForDevice_reconfigure(devid)
+
+ if self.info.is_hvm():
+ if pci_state == 'Initialising':
+ # HVM PCI device attachment
+ self.pci_device_attach(dev_sxp)
num_devs = dev_control.cleanupDevice(devid)
# update XendConfig with new device info
diff -r 94ffd85005c5 tools/python/xen/xend/server/DevConstants.py
--- a/tools/python/xen/xend/server/DevConstants.py Tue Apr 14 15:23:53
2009 +0100
+++ b/tools/python/xen/xend/server/DevConstants.py Tue Apr 21 16:51:20
2009 +0900
@@ -29,6 +29,8 @@
Timeout = 4
Busy = 5
Disconnected = 6
+Initialised = 7
+Reconfigured = 8
xenbusState = {
'Unknown' : 0,
diff -r 94ffd85005c5 tools/python/xen/xend/server/pciif.py
--- a/tools/python/xen/xend/server/pciif.py Tue Apr 14 15:23:53 2009 +0100
+++ b/tools/python/xen/xend/server/pciif.py Tue Apr 21 16:51:20 2009 +0900
@@ -17,6 +17,7 @@
#============================================================================
+from threading import Event
import types
import time
@@ -27,7 +28,7 @@
from xen.xend.XendConstants import *
from xen.xend.server.DevController import DevController
-from xen.xend.server.DevConstants import xenbusState
+from xen.xend.server.DevConstants import *
import xen.lowlevel.xc
@@ -489,13 +490,16 @@
"bind your slot/device to the PCI backend using sysfs" \
)%(dev.name))
- if not self.vm.info.is_hvm():
- pci_str = "0x%x, 0x%x, 0x%x, 0x%x" % (domain, bus, slot, func)
- bdf = xc.deassign_device(fe_domid, pci_str)
- if bdf > 0:
- raise VmError("Failed to deassign device from IOMMU (%x:%x.%x)"
- % (bus, slot, func))
- log.debug("pci: deassign device %x:%x.%x" % (bus, slot, func))
+ # Need to do FLR here before deassign device in order to terminate
+ # DMA transaction, etc
+ dev.do_FLR()
+
+ pci_str = "0x%x, 0x%x, 0x%x, 0x%x" % (domain, bus, slot, func)
+ bdf = xc.deassign_device(fe_domid, pci_str)
+ if bdf > 0:
+ raise VmError("Failed to deassign device from IOMMU (%x:%x.%x)"
+ % (bus, slot, func))
+ log.debug("pci: Deassign device %x:%x.%x" % (bus, slot, func))
for (start, size) in dev.ioports:
log.debug('pci: disabling ioport 0x%x/0x%x'%(start,size))
@@ -528,7 +532,6 @@
if rc<0:
raise VmError(('pci: failed to configure irq on device '+
'%s - errno=%d')%(dev.name,rc))
- dev.do_FLR()
def cleanupDevice(self, devid):
""" Detach I/O resources for device and cleanup xenstore nodes
@@ -603,8 +606,53 @@
except:
log.exception("Unwatching aerState failed.")
- def waitForBackend(self,devid):
- return (0, "ok - no hotplug")
+ def waitForBackend(self, devid):
+ return self.waitForBackend_reconfigure(devid)
def migrate(self, config, network, dst, step, domName):
raise XendError('Migration not permitted with assigned PCI device.')
+
+ def createDevice(self, config):
+ """@see DevController.createDevice"""
+ devid = DevController.createDevice(self, config)
+ if devid:
+ self.waitForDevice(devid)
+
+ return devid
+
+ def waitForBackend_reconfigure(self, devid):
+ frontpath = self.frontendPath(devid)
+ backpath = xstransact.Read(frontpath, "backend")
+ if backpath:
+ statusPath = backpath + '/' + "state"
+ ev = Event()
+ result = { 'status': Timeout }
+
+ xswatch(statusPath, xenbusStatusCallback, ev, result)
+
+ ev.wait(DEVICE_CREATE_TIMEOUT)
+
+ return (result['status'], None)
+ else:
+ return (Missing, None)
+
+
+def xenbusStatusCallback(statusPath, ev, result):
+ log.debug("xenbusStatusCallback %s.", statusPath)
+
+ status = xstransact.Read(statusPath)
+
+ if status == str(xenbusState['Connected']):
+ result['status'] = Connected
+ elif status == str(xenbusState['Initialised']):
+ result['status'] = Initialised
+ elif status == str(xenbusState['Reconfigured']):
+ result['status'] = Reconfigured
+ else:
+ return 1
+
+ log.debug("xenbusStatusCallback %d.", result['status'])
+
+ ev.set()
+ return 0
+
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