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.
Introduce an rtas call to 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>
---
Changelog
v2:
* Using rtas call for getting ibm,loc-code
* Added sPAPRPHBState::get_loc_code
* Refactored the return type of get_loc_code
* Drop stat(), and rely on g_file_get_contents
return type for file existence
v1:
* Dropped is_vfio patch and using TYPE_SPAPR_PCI_VFIO_HOST_BRIDGE
to recognise vfio devices
* Removed wrapper for hcall
* Added sPAPRPHBClass::get_loc_code
hw/ppc/spapr_pci.c | 70 +++++++++++++++++++++++++++++++++++++++++++++
hw/ppc/spapr_pci_vfio.c | 40 ++++++++++++++++++++++++++
include/hw/pci-host/spapr.h | 1 +
include/hw/ppc/spapr.h | 3 +-
4 files changed, 113 insertions(+), 1 deletion(-)
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 05f4fac..fe6dfd5 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -580,6 +580,50 @@ param_error_exit:
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}
+static void rtas_ibm_get_loc_code(PowerPCCPU *cpu,
+ sPAPREnvironment *spapr,
+ uint32_t token, uint32_t nargs,
+ target_ulong args, uint32_t nret,
+ target_ulong rets)
+{
+ sPAPRPHBState *sphb = NULL;
+ sPAPRPHBClass *spc = NULL;
+ char *buf = NULL;
+ PCIDevice *pdev;
+ uint64_t buid;
+ uint32_t config_addr, loc_code, size;
+
+ if ((nargs != 5) || (nret != 1)) {
+ goto param_error_exit;
+ }
+
+ config_addr = rtas_ld(args, 0);
+ buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
+ loc_code = rtas_ld(args, 3);
+ size = rtas_ld(args, 4);
+
+ sphb = find_phb(spapr, buid);
+ pdev = find_dev(spapr, buid, config_addr);
+
+ if (!sphb || !pdev) {
+ goto param_error_exit;
+ }
+
+ spc = SPAPR_PCI_HOST_BRIDGE_GET_CLASS(sphb);
+ if (spc->get_loc_code && spc->get_loc_code(sphb, pdev, &buf)) {
+ uint32_t loc_len = strlen(buf);
+
+ loc_len = (loc_len > size) ? size : loc_len;
+ cpu_physical_memory_write(loc_code, buf, loc_len);
+ g_free(buf);
+ rtas_st(rets, 0, RTAS_OUT_SUCCESS);
+ return;
+ }
+
+param_error_exit:
+ rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
+}
+
static void rtas_ibm_configure_pe(PowerPCCPU *cpu,
sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
@@ -909,6 +953,27 @@ static void spapr_phb_finish_realize(sPAPRPHBState *sphb,
Error **errp)
spapr_tce_get_iommu(tcet));
}
+static bool spapr_phb_get_loc_code(sPAPRPHBState *sphb, PCIDevice *pdev,
+ char **loc_code)
+{
+ char *path = g_malloc(PATH_MAX);
+
+ if (!path) {
+ return false;
+ }
+
+ /*
+ * For non-vfio devices and failures make up the location code out
+ * 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));
+ *loc_code = path;
+ return true;
+}
+
static int spapr_phb_children_reset(Object *child, void *opaque)
{
DeviceState *dev = (DeviceState *) object_dynamic_cast(child,
TYPE_DEVICE);
@@ -1058,6 +1123,7 @@ static void spapr_phb_class_init(ObjectClass *klass, void
*data)
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->cannot_instantiate_with_device_add_yet = false;
spc->finish_realize = spapr_phb_finish_realize;
+ spc->get_loc_code = spapr_phb_get_loc_code;
}
static const TypeInfo spapr_phb_info = {
@@ -1245,6 +1311,10 @@ void spapr_pci_rtas_init(void)
spapr_rtas_register(RTAS_IBM_SLOT_ERROR_DETAIL,
"ibm,slot-error-detail",
rtas_ibm_slot_error_detail);
+ spapr_rtas_register(RTAS_IBM_GET_LOC_CODE,
+ "ibm,get-loc-code",
