The RTAS call "ibm,read-slot-reset-state2" is being used to retrieve
the various states of the specified PE, e.g. reset state, frozen DMA,
frozen MMIO etc. The patch implements the backend to emulate the
RTAS call.
Signed-off-by: Gavin Shan <gws...@linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/eeh-rtas.c | 77 +++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/eeh-rtas.c
b/arch/powerpc/platforms/powernv/eeh-rtas.c
index 3e38d13..031ee8c 100644
--- a/arch/powerpc/platforms/powernv/eeh-rtas.c
+++ b/arch/powerpc/platforms/powernv/eeh-rtas.c
@@ -260,6 +260,80 @@ out:
return ret;
}
+static int kvmppc_eeh_get_state2(struct kvm_vcpu *vcpu,
+ struct rtas_args *args)
+{
+ struct pci_controller *hose;
+ struct pnv_phb *phb;
+ struct eeh_dev *edev;
+ struct eeh_pe *pe;
+ struct eeh_vfio_pci_addr addr;
+ int result, ret = 0;
+
+ /* Sanity check on parameter */
+ if (args->nargs != 3 || (args->nret != 4 && args->nret != 5)) {
+ pr_warn("%s: Non-matched argument (%d, %d) - (3, 4/5)\n",
+ __func__, args->nargs, args->nret);
+ ret = -3;
+ goto out;
+ }
+
+ /* Figure out the address */
+ if (kvmppc_eeh_format_addr(vcpu, args, &addr, false, &edev, &pe)) {
+ ret = -3;
+ goto out;
+ }
+
+ /* Make sure that the EEH stuff has been initialized */
+ hose = pe->phb;
+ phb = hose->private_data;
+ if (!(phb->flags & PNV_PHB_FLAG_EEH)) {
+ pr_warn("%s: EEH disabled on PHB#%d\n",
+ __func__, hose->global_number);
+ ret = -3;
+ args->rets[2] = 0;
+ goto out;
+ }
+
+ /*
+ * Mark EEH supported on the PCI device. Otherwise,
+ * the PE state is meaningless to the guest
+ */
+ args->rets[2] = 1;
+
+ /* Call to the IOC dependent function */
+ if (phb->eeh_ops && phb->eeh_ops->get_state) {
+ result = phb->eeh_ops->get_state(pe);
+
+ if (!(result & EEH_STATE_RESET_ACTIVE) &&
+ (result & EEH_STATE_DMA_ENABLED) &&
+ (result & EEH_STATE_MMIO_ENABLED))
+ args->rets[1] = 0;
+ else if (result & EEH_STATE_RESET_ACTIVE)
+ args->rets[1] = 1;
+ else if (!(result & EEH_STATE_RESET_ACTIVE) &&
+ !(result & EEH_STATE_DMA_ENABLED) &&
+ !(result & EEH_STATE_MMIO_ENABLED))
+ args->rets[1] = 2;
+ else if (!(result & EEH_STATE_RESET_ACTIVE) &&
+ (result & EEH_STATE_DMA_ENABLED) &&
+ !(result & EEH_STATE_MMIO_ENABLED))
+ args->rets[1] = 4;
+ else {
+ args->rets[1] = 5;
+ args->rets[3] = 1000;
+ }
+
+ ret = 0;
+ } else {
+ pr_warn("%s: Unsupported request\n",
+ __func__);
+ ret = -3;
+ }
+out:
+ return ret;
+}
+
/**
* kvmppc_eeh_rtas - Backend for EEH RTAS emulation
* @vcpu: KVM virtual CPU
@@ -282,6 +356,9 @@ void kvmppc_eeh_rtas(struct kvm_vcpu *vcpu, struct
rtas_args *args, int op)
case eeh_rtas_set_slot_reset:
ret = kvmppc_eeh_set_reset(vcpu, args);
break;
+ case eeh_rtas_read_slot_reset_state2:
+ ret = kvmppc_eeh_get_state2(vcpu, args);
+ break;
default:
pr_warn("%s: Unsupported EEH RTAS service#%d\n",
__func__, op);
--
1.8.3.2
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