| Message ID | 20130320165728.22281.10294.stgit@bling.home |
|---|---|
| State | New |
| Headers | show |
Dear Alex, Am Mittwoch, den 20.03.2013, 10:58 -0600 schrieb Alex Williamson: > As QEMU gains PCI bridge and PCIe root port support, could you give a commit or version for QEMU please. > we won't always find the VGA device on the root bus. We therefore > need to add support to find and enable a VGA device and the path to it > through the VGA Enable support in the PCI bridge control register. Just to be sure, did you test this with older QEMU too? > Signed-off-by: Alex Williamson <alex.williamson@redhat.com> > --- > > v3: use pci_config_maskw() to trim out some code > v2: move to qemu specific pciinit.c > > src/optionroms.c | 2 +- > src/pciinit.c | 40 ++++++++++++++++++++++++++++++++++++++++ > src/util.h | 1 + > 3 files changed, 42 insertions(+), 1 deletion(-) > > diff --git a/src/optionroms.c b/src/optionroms.c > index caa2151..ac92613 100644 > --- a/src/optionroms.c > +++ b/src/optionroms.c > @@ -213,7 +213,7 @@ run_file_roms(const char *prefix, int isvga, u64 *sources) > ****************************************************************/ > > // Verify device is a vga device with legacy address decoding enabled. > -static int > +int > is_pci_vga(struct pci_device *pci) > { > if (pci->class != PCI_CLASS_DISPLAY_VGA) > diff --git a/src/pciinit.c b/src/pciinit.c > index ce0a4cc..bb9355f 100644 > --- a/src/pciinit.c > +++ b/src/pciinit.c > @@ -316,6 +316,44 @@ static void pci_bios_init_devices(void) > } > } > > +static void pci_enable_default_vga(void) > +{ > + struct pci_device *pci; > + > + foreachpci(pci) { > + if (is_pci_vga(pci)) { > + dprintf(1, "PCI: Using %02x:%02x.%x for primary VGA\n", > + pci_bdf_to_bus(pci->bdf), pci_bdf_to_dev(pci->bdf), > + pci_bdf_to_fn(pci->bdf)); As this is used several times, a function returning a string with %02x:% 02x.%x would be handy. > + return; > + } > + } […] Acked-by: Paul Menzel <paulepanter@users.sourceforge.net> Thahks, Paul
On Wed, 2013-03-20 at 19:05 +0100, Paul Menzel wrote: > Dear Alex, > > > Am Mittwoch, den 20.03.2013, 10:58 -0600 schrieb Alex Williamson: > > As QEMU gains PCI bridge and PCIe root port support, > > could you give a commit or version for QEMU please. This would be targeted towards QEMU 1.5. Michael recently sent a pull request with this patch to enable VGA routing in bridges: https://git.kernel.org/cgit/virt/kvm/mst/qemu.git/commit/?h=pci&id=e475aeac3e2e7f6632c3ea7e83f4431c0ba3a467 It's difficult to make use of without an assigned VGA device, which I plan to start posting soon. > > we won't always find the VGA device on the root bus. We therefore > > need to add support to find and enable a VGA device and the path to it > > through the VGA Enable support in the PCI bridge control register. > > Just to be sure, did you test this with older QEMU too? Yes, it works with the QEMU 1.2.x shipped in F18. Any existing QEMU configuration is going to have the VGA device on the host bridge and therefore bail out on the first loop, having done nothing other than add a debug print. > > Signed-off-by: Alex Williamson <alex.williamson@redhat.com> > > --- > > > > v3: use pci_config_maskw() to trim out some code > > v2: move to qemu specific pciinit.c > > > > src/optionroms.c | 2 +- > > src/pciinit.c | 40 ++++++++++++++++++++++++++++++++++++++++ > > src/util.h | 1 + > > 3 files changed, 42 insertions(+), 1 deletion(-) > > > > diff --git a/src/optionroms.c b/src/optionroms.c > > index caa2151..ac92613 100644 > > --- a/src/optionroms.c > > +++ b/src/optionroms.c > > @@ -213,7 +213,7 @@ run_file_roms(const char *prefix, int isvga, u64 *sources) > > ****************************************************************/ > > > > // Verify device is a vga device with legacy address decoding enabled. > > -static int > > +int > > is_pci_vga(struct pci_device *pci) > > { > > if (pci->class != PCI_CLASS_DISPLAY_VGA) > > diff --git a/src/pciinit.c b/src/pciinit.c > > index ce0a4cc..bb9355f 100644 > > --- a/src/pciinit.c > > +++ b/src/pciinit.c > > @@ -316,6 +316,44 @@ static void pci_bios_init_devices(void) > > } > > } > > > > +static void pci_enable_default_vga(void) > > +{ > > + struct pci_device *pci; > > + > > + foreachpci(pci) { > > + if (is_pci_vga(pci)) { > > + dprintf(1, "PCI: Using %02x:%02x.%x for primary VGA\n", > > + pci_bdf_to_bus(pci->bdf), pci_bdf_to_dev(pci->bdf), > > + pci_bdf_to_fn(pci->bdf)); > > As this is used several times, a function returning a string with %02x:% > 02x.%x would be handy. > > > + return; > > + } > > + } > > […] > > Acked-by: Paul Menzel <paulepanter@users.sourceforge.net> Thanks! Alex
On 03/20/13 17:58, Alex Williamson wrote: > As QEMU gains PCI bridge and PCIe root port support, we won't always > find the VGA device on the root bus. We therefore need to add support > to find and enable a VGA device and the path to it through the VGA > Enable support in the PCI bridge control register. > > Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Looks good to me. cheers, Gerd
On Wed, Mar 20, 2013 at 10:58:47AM -0600, Alex Williamson wrote: > As QEMU gains PCI bridge and PCIe root port support, we won't always > find the VGA device on the root bus. We therefore need to add support > to find and enable a VGA device and the path to it through the VGA > Enable support in the PCI bridge control register. > > Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Thanks. I pushed this change. -Kevin
diff --git a/src/optionroms.c b/src/optionroms.c index caa2151..ac92613 100644 --- a/src/optionroms.c +++ b/src/optionroms.c @@ -213,7 +213,7 @@ run_file_roms(const char *prefix, int isvga, u64 *sources) ****************************************************************/ // Verify device is a vga device with legacy address decoding enabled. -static int +int is_pci_vga(struct pci_device *pci) { if (pci->class != PCI_CLASS_DISPLAY_VGA) diff --git a/src/pciinit.c b/src/pciinit.c index ce0a4cc..bb9355f 100644 --- a/src/pciinit.c +++ b/src/pciinit.c @@ -316,6 +316,44 @@ static void pci_bios_init_devices(void) } } +static void pci_enable_default_vga(void) +{ + struct pci_device *pci; + + foreachpci(pci) { + if (is_pci_vga(pci)) { + dprintf(1, "PCI: Using %02x:%02x.%x for primary VGA\n", + pci_bdf_to_bus(pci->bdf), pci_bdf_to_dev(pci->bdf), + pci_bdf_to_fn(pci->bdf)); + return; + } + } + + pci = pci_find_class(PCI_CLASS_DISPLAY_VGA); + if (!pci) { + dprintf(1, "PCI: No VGA devices found\n"); + return; + } + + dprintf(1, "PCI: Enabling %02x:%02x.%x for primary VGA\n", + pci_bdf_to_bus(pci->bdf), pci_bdf_to_dev(pci->bdf), + pci_bdf_to_fn(pci->bdf)); + + pci_config_maskw(pci->bdf, PCI_COMMAND, 0, + PCI_COMMAND_IO | PCI_COMMAND_MEMORY); + + while (pci->parent) { + pci = pci->parent; + + dprintf(1, "PCI: Setting VGA enable on bridge %02x:%02x.%x\n", + pci_bdf_to_bus(pci->bdf), pci_bdf_to_dev(pci->bdf), + pci_bdf_to_fn(pci->bdf)); + + pci_config_maskw(pci->bdf, PCI_BRIDGE_CONTROL, 0, PCI_BRIDGE_CTL_VGA); + pci_config_maskw(pci->bdf, PCI_COMMAND, 0, + PCI_COMMAND_IO | PCI_COMMAND_MEMORY); + } +} /**************************************************************** * Platform device initialization @@ -804,4 +842,6 @@ pci_setup(void) pci_bios_init_devices(); free(busses); + + pci_enable_default_vga(); } diff --git a/src/util.h b/src/util.h index af029fc..99aff78 100644 --- a/src/util.h +++ b/src/util.h @@ -344,6 +344,7 @@ void vgahook_setup(struct pci_device *pci); // optionroms.c void call_bcv(u16 seg, u16 ip); +int is_pci_vga(struct pci_device *pci); void optionrom_setup(void); void vgarom_setup(void); void s3_resume_vga(void);
As QEMU gains PCI bridge and PCIe root port support, we won't always find the VGA device on the root bus. We therefore need to add support to find and enable a VGA device and the path to it through the VGA Enable support in the PCI bridge control register. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> --- v3: use pci_config_maskw() to trim out some code v2: move to qemu specific pciinit.c src/optionroms.c | 2 +- src/pciinit.c | 40 ++++++++++++++++++++++++++++++++++++++++ src/util.h | 1 + 3 files changed, 42 insertions(+), 1 deletion(-)