The RTAS call "ibm,set-eeh-option" is being used to enable/disable
EEH functionality on the specified PE, or enable MMIO/DMA for the
frozen PE. The patch emulates the RTAS call.
Signed-off-by: Gavin Shan <gws...@linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/eeh-rtas.c | 83 +++++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/eeh-rtas.c
b/arch/powerpc/platforms/powernv/eeh-rtas.c
index f04b820..1a037fd 100644
--- a/arch/powerpc/platforms/powernv/eeh-rtas.c
+++ b/arch/powerpc/platforms/powernv/eeh-rtas.c
@@ -91,6 +91,86 @@ static int kvmppc_eeh_format_addr(struct kvm_vcpu *vcpu,
return 0;
}
+static int kvmppc_eeh_set_option(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 opcode;
+ bool is_legacy = false;
+ int ret = 0;
+
+ /* Sanity check on parameter */
+ if (args->nargs != 4 || args->nret != 1) {
+ pr_warn("%s: Non-matched arguments (%d, %d) - (4, 1)\n",
+ __func__, args->nargs, args->nret);
+ ret = -3;
+ goto out;
+ }
+
+ /* Check on opcode */
+ opcode = args->args[3];
+ if (opcode < EEH_OPT_DISABLE || opcode > EEH_OPT_THAW_DMA) {
+ pr_warn("%s: opcode %d out of range (%d, %d)\n",
+ __func__, opcode, EEH_OPT_DISABLE, EEH_OPT_THAW_DMA);
+ ret = -3;
+ goto out;
+ }
+
+ if (opcode == EEH_OPT_ENABLE)
+ is_legacy = true;
+
+ /* Figure out the address */
+ if (kvmppc_eeh_format_addr(vcpu, args, &addr, is_legacy, &edev, &pe)) {
+ ret = -7;
+ goto out;
+ }
+
+ /* Insure 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 = -7;
+ goto out;
+ }
+
+ /*
+ * The EEH functionality has been enabled on all PEs
+ * by default. So just return success. The same situation
+ * would be applied while we disable EEH functionality.
+ * However, the guest isn't expected to disable that
+ * at all.
+ */
+ if (opcode == EEH_OPT_DISABLE ||
+ opcode == EEH_OPT_ENABLE) {
+ ret = 0;
+ goto out;
+ }
+
+ /*
+ * Call into the IODA dependent backend in order
+ * to enable DMA or MMIO for the indicated PE.
+ */
+ if (phb->eeh_ops && phb->eeh_ops->set_option) {
+ if (phb->eeh_ops->set_option(pe, opcode)) {
+ pr_warn("%s: Failure from backend\n",
+ __func__);
+ ret = -1;
+ }
+ } else {
+ pr_warn("%s: Unsupported request\n",
+ __func__);
+ ret = -7;
+ }
+out:
+ return ret;
+}
+
/**
* kvmppc_eeh_rtas - Backend for EEH RTAS emulation
* @vcpu: KVM virtual CPU
@@ -107,6 +187,9 @@ void kvmppc_eeh_rtas(struct kvm_vcpu *vcpu, struct
rtas_args *args, int op)
/* Parse the requested service */
switch (op) {
+ case eeh_rtas_set_option:
+ ret = kvmppc_eeh_set_option(vcpu, args);
+ break;
default:
pr_warn("%s: Unsupported EEH RTAS service#%d\n",
__func__, op);
--
1.8.3.2
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