On Tue, 5 May 2015 14:23:56 +0530 Nikunj A Dadhania <nik...@linux.vnet.ibm.com> wrote:
> Each hardware instance has a platform unique location code. The OF > device tree that describes a part of a hardware entity must include > the “ibm,loc-code” property with a value that represents the location > code for that hardware entity. > > Populate ibm,loc-code. > 1) PCI passthru devices need to identify with its own ibm,loc-code > available on the host. > 2) Emulated devices encode as following: > qemu_<name>:<phb-index>:<slot>.<fn> > > Signed-off-by: Nikunj A Dadhania <nik...@linux.vnet.ibm.com> > --- > hw/ppc/spapr_pci.c | 86 > +++++++++++++++++++++++++++++++++++++++++++++++------- > 1 file changed, 75 insertions(+), 11 deletions(-) > > diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c > index cbd5661..eacf0bd 100644 > --- a/hw/ppc/spapr_pci.c > +++ b/hw/ppc/spapr_pci.c > @@ -744,6 +744,70 @@ static AddressSpace *spapr_pci_dma_iommu(PCIBus *bus, > void *opaque, int devfn) > return &phb->iommu_as; > } > > +static bool spapr_phb_vfio_get_devspec_value(PCIDevice *pdev, char **value) > +{ > + char *host; > + char path[PATH_MAX]; > + > + host = object_property_get_str(OBJECT(pdev), "host", NULL); > + if (!host) { > + return false; > + } > + > + snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/devspec", host); > + g_free(host); > + > + return g_file_get_contents(path, value, NULL, NULL); > +} > + > +static char *spapr_phb_vfio_get_loc_code(sPAPRPHBState *sphb, PCIDevice > *pdev) > +{ > + char path[PATH_MAX], *buf = NULL; > + > + /* We have a vfio host bridge lets get the path. */ > + if (!spapr_phb_vfio_get_devspec_value(pdev, &buf)) { > + return NULL; > + } > + > + snprintf(path, sizeof(path), "/proc/device-tree%s/ibm,loc-code", buf); > + g_free(buf); > + > + if (g_file_get_contents(path, &buf, NULL, NULL)) { > + return buf; > + } else { > + return NULL; > + } Minor idea for an optimization: g_file_get_contents() should set buf to NULL in case of errors anyway, so you could omit the "if" and "return NULLL" and simply always "return buf" here. > +} > + > +static char *spapr_phb_get_loc_code(sPAPRPHBState *sphb, PCIDevice *pdev) > +{ > + char *path = g_malloc(PATH_MAX); > + > + if (!path) { > + return NULL; > + } > + > + /* > + * For non-vfio devices and failures make up the location code out This comment ("and failures") ... > + * of the name, slot and function. > + * > + * qemu_<name>:<phb-index>:<slot>.<fn> > + */ > + snprintf(path, PATH_MAX, "qemu_%s:%02d:%02d.%1d", pdev->name, > + sphb->index, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn)); > + return path; > +} > + > + > +static char *spapr_ibm_get_loc_code(sPAPRPHBState *sphb, PCIDevice *pdev) > +{ > + if (object_dynamic_cast(OBJECT(pdev), "vfio-pci") != NULL) { > + return spapr_phb_vfio_get_loc_code(sphb, pdev); > + } else { > + return spapr_phb_get_loc_code(sphb, pdev); > + } ... does not match quite the behavior here, as far as I can see. I guess you also wanted to fall back to spapr_phb_get_loc_code() in case spapr_phb_vfio_get_loc_code() did not work as expected (eg. when the access to the /sys or /proc filesystem failed)? > +} > + > /* Macros to operate with address in OF binding to PCI */ > #define b_x(x, p, l) (((x) & ((1<<(l))-1)) << (p)) > #define b_n(x) b_x((x), 31, 1) /* 0 if relocatable */ > @@ -881,12 +945,12 @@ static void populate_resource_props(PCIDevice *d, > ResourceProps *rp) > } > > static int spapr_populate_pci_child_dt(PCIDevice *dev, void *fdt, int offset, > - int phb_index, int drc_index, > - const char *drc_name) > + sPAPRPHBState *phb, int drc_index) As David already noted, the sPAPRPHBState related hunks likely rather belong to an earlier patch already? Thomas