Iterate over the PCI bridges to lookup the PCI device associated with
the block device.
This allows to lookup the driver under the following syspath:
/sys/devices/pci0000:00/0000:00:02.2/0000:03:00.0/virtio2/block/vda/vda3
It also works with an "old-style" Q35 libvirt hierarchy: root complex
-> DMI-PCI bridge -> PCI-PCI bridge -> virtio controller, ex:
/sys/devices/pci0000:00/0000:00:03.0/0000:01:01.0/0000:02:01.0/virtio1/block/vda/vda3
The setup can be reproduced with the following qemu command line
(Thanks Marcel for help):
qemu-system-x86_64 -M q35 \
-device i82801b11-bridge,id=dmi2pci_bridge,bus=pcie.0
-device pci-bridge,id=pci_bridge,bus=dmi2pci_bridge,addr=0x1,chassis_nr=1
-device virtio-blk-pci,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,bus=pci_bridge,addr=0x1
For consistency with other syspath-related debug messages, replace a
\"%s\" in the message with '%s'.
Fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=1567041
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
---
v3:
- replace \"%s\" in the debug message with '%s'
- simplify the code by getting rid of an "else if"
qga/commands-posix.c | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 0dc219dbcf..624b0dc0c3 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -875,13 +875,28 @@ static void build_guest_fsinfo_for_real_device(char const *syspath,
p = strstr(syspath, "/devices/pci");
if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
- g_debug("only pci device is supported: sysfs path \"%s\"", syspath);
+ g_debug("only pci device is supported: sysfs path '%s'", syspath);
return;
}
- driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp);
- if (!driver) {
- goto cleanup;
+ p += 12 + pcilen;
+ while (true) {
+ driver = get_pci_driver(syspath, p - syspath, errp);
+ if (driver && (g_str_equal(driver, "ata_piix") ||
+ g_str_equal(driver, "sym53c8xx") ||
+ g_str_equal(driver, "virtio-pci") ||
+ g_str_equal(driver, "ahci"))) {
+ break;
+ }
+
+ if (sscanf(p, "/%x:%x:%x.%x%n",
+ pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) {
+ p += pcilen;
+ continue;
+ }
+
+ g_debug("unsupported driver or sysfs path '%s'", syspath);
+ return;
}
p = strstr(syspath, "/target");
--
2.17.0.253.g3dd125b46d
Hi Michael On Mon, May 14, 2018 at 2:38 PM, Marc-André Lureau <marcandre.lureau@redhat.com> wrote: > Iterate over the PCI bridges to lookup the PCI device associated with > the block device. > > This allows to lookup the driver under the following syspath: > /sys/devices/pci0000:00/0000:00:02.2/0000:03:00.0/virtio2/block/vda/vda3 > > It also works with an "old-style" Q35 libvirt hierarchy: root complex > -> DMI-PCI bridge -> PCI-PCI bridge -> virtio controller, ex: > /sys/devices/pci0000:00/0000:00:03.0/0000:01:01.0/0000:02:01.0/virtio1/block/vda/vda3 > > The setup can be reproduced with the following qemu command line > (Thanks Marcel for help): > > qemu-system-x86_64 -M q35 \ > -device i82801b11-bridge,id=dmi2pci_bridge,bus=pcie.0 > -device pci-bridge,id=pci_bridge,bus=dmi2pci_bridge,addr=0x1,chassis_nr=1 > -device virtio-blk-pci,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,bus=pci_bridge,addr=0x1 > > For consistency with other syspath-related debug messages, replace a > \"%s\" in the message with '%s'. > > Fixes: > https://bugzilla.redhat.com/show_bug.cgi?id=1567041 > > Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> > Reviewed-by: Laszlo Ersek <lersek@redhat.com> > --- ping, are you planning to send a pull request for qga patches > > v3: > - replace \"%s\" in the debug message with '%s' > - simplify the code by getting rid of an "else if" > > qga/commands-posix.c | 23 +++++++++++++++++++---- > 1 file changed, 19 insertions(+), 4 deletions(-) > > diff --git a/qga/commands-posix.c b/qga/commands-posix.c > index 0dc219dbcf..624b0dc0c3 100644 > --- a/qga/commands-posix.c > +++ b/qga/commands-posix.c > @@ -875,13 +875,28 @@ static void build_guest_fsinfo_for_real_device(char const *syspath, > p = strstr(syspath, "/devices/pci"); > if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n", > pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) { > - g_debug("only pci device is supported: sysfs path \"%s\"", syspath); > + g_debug("only pci device is supported: sysfs path '%s'", syspath); > return; > } > > - driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp); > - if (!driver) { > - goto cleanup; > + p += 12 + pcilen; > + while (true) { > + driver = get_pci_driver(syspath, p - syspath, errp); > + if (driver && (g_str_equal(driver, "ata_piix") || > + g_str_equal(driver, "sym53c8xx") || > + g_str_equal(driver, "virtio-pci") || > + g_str_equal(driver, "ahci"))) { > + break; > + } > + > + if (sscanf(p, "/%x:%x:%x.%x%n", > + pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) { > + p += pcilen; > + continue; > + } > + > + g_debug("unsupported driver or sysfs path '%s'", syspath); > + return; > } > > p = strstr(syspath, "/target"); > -- > 2.17.0.253.g3dd125b46d > > -- Marc-André Lureau
Hi Michael On Mon, Jun 11, 2018 at 3:28 PM, Marc-André Lureau <marcandre.lureau@gmail.com> wrote: > Hi Michael > > On Mon, May 14, 2018 at 2:38 PM, Marc-André Lureau > <marcandre.lureau@redhat.com> wrote: >> Iterate over the PCI bridges to lookup the PCI device associated with >> the block device. >> >> This allows to lookup the driver under the following syspath: >> /sys/devices/pci0000:00/0000:00:02.2/0000:03:00.0/virtio2/block/vda/vda3 >> >> It also works with an "old-style" Q35 libvirt hierarchy: root complex >> -> DMI-PCI bridge -> PCI-PCI bridge -> virtio controller, ex: >> /sys/devices/pci0000:00/0000:00:03.0/0000:01:01.0/0000:02:01.0/virtio1/block/vda/vda3 >> >> The setup can be reproduced with the following qemu command line >> (Thanks Marcel for help): >> >> qemu-system-x86_64 -M q35 \ >> -device i82801b11-bridge,id=dmi2pci_bridge,bus=pcie.0 >> -device pci-bridge,id=pci_bridge,bus=dmi2pci_bridge,addr=0x1,chassis_nr=1 >> -device virtio-blk-pci,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,bus=pci_bridge,addr=0x1 >> >> For consistency with other syspath-related debug messages, replace a >> \"%s\" in the message with '%s'. >> >> Fixes: >> https://bugzilla.redhat.com/show_bug.cgi?id=1567041 >> >> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> >> Reviewed-by: Laszlo Ersek <lersek@redhat.com> >> --- > > ping, > > are you planning to send a pull request for qga patches ping > >> >> v3: >> - replace \"%s\" in the debug message with '%s' >> - simplify the code by getting rid of an "else if" >> >> qga/commands-posix.c | 23 +++++++++++++++++++---- >> 1 file changed, 19 insertions(+), 4 deletions(-) >> >> diff --git a/qga/commands-posix.c b/qga/commands-posix.c >> index 0dc219dbcf..624b0dc0c3 100644 >> --- a/qga/commands-posix.c >> +++ b/qga/commands-posix.c >> @@ -875,13 +875,28 @@ static void build_guest_fsinfo_for_real_device(char const *syspath, >> p = strstr(syspath, "/devices/pci"); >> if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n", >> pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) { >> - g_debug("only pci device is supported: sysfs path \"%s\"", syspath); >> + g_debug("only pci device is supported: sysfs path '%s'", syspath); >> return; >> } >> >> - driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp); >> - if (!driver) { >> - goto cleanup; >> + p += 12 + pcilen; >> + while (true) { >> + driver = get_pci_driver(syspath, p - syspath, errp); >> + if (driver && (g_str_equal(driver, "ata_piix") || >> + g_str_equal(driver, "sym53c8xx") || >> + g_str_equal(driver, "virtio-pci") || >> + g_str_equal(driver, "ahci"))) { >> + break; >> + } >> + >> + if (sscanf(p, "/%x:%x:%x.%x%n", >> + pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) { >> + p += pcilen; >> + continue; >> + } >> + >> + g_debug("unsupported driver or sysfs path '%s'", syspath); >> + return; >> } >> >> p = strstr(syspath, "/target"); >> -- >> 2.17.0.253.g3dd125b46d >> >> > > > > -- > Marc-André Lureau -- Marc-André Lureau
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