This patch introduces the hypervisor call H_GET_TCE which is basically the
reverse of H_PUT_TCE, as defined in the Power Architecture Platform
Requirements (PAPR).
The hcall H_GET_TCE is required by the kdump kernel which is calling it to
retrieve the TCE set up by the panicing kernel.
Signed-off-by: Laurent Dufour <lduf...@linux.vnet.ibm.com>
---
hw/ppc/spapr_iommu.c | 37 +++++++++++++++++++++++++++++++++++++
trace-events | 1 +
2 files changed, 38 insertions(+)
diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
index ef45f4f..d9fe946 100644
--- a/hw/ppc/spapr_iommu.c
+++ b/hw/ppc/spapr_iommu.c
@@ -243,6 +243,42 @@ static target_ulong h_put_tce(PowerPCCPU *cpu,
sPAPREnvironment *spapr,
return ret;
}
+static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
+ target_ulong *tce)
+{
+ if (ioba >= tcet->window_size) {
+ hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x"
+ TARGET_FMT_lx "\n", ioba);
+ return H_PARAMETER;
+ }
+
+ *tce = tcet->table[ioba >> SPAPR_TCE_PAGE_SHIFT];
+
+ return H_SUCCESS;
+}
+
+static target_ulong h_get_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
+ target_ulong opcode, target_ulong *args)
+{
+ target_ulong liobn = args[0];
+ target_ulong ioba = args[1];
+ target_ulong tce = 0;
+ target_ulong ret = H_PARAMETER;
+ sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
+
+ ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);
+
+ if (tcet) {
+ ret = get_tce_emu(tcet, ioba, &tce);
+ if (!ret) {
+ args[0] = tce;
+ }
+ }
+ trace_spapr_iommu_get(liobn, ioba, ret, tce);
+
+ return ret;
+}
+
int spapr_dma_dt(void *fdt, int node_off, const char *propname,
uint32_t liobn, uint64_t window, uint32_t size)
{
@@ -295,6 +331,7 @@ static void spapr_tce_table_class_init(ObjectClass *klass,
void *data)
/* hcall-tce */
spapr_register_hypercall(H_PUT_TCE, h_put_tce);
+ spapr_register_hypercall(H_GET_TCE, h_get_tce);
}
static TypeInfo spapr_tce_table_info = {
diff --git a/trace-events b/trace-events
index 0b3c1ac..5b306a0 100644
--- a/trace-events
+++ b/trace-events
@@ -1136,6 +1136,7 @@ xics_ics_eoi(int nr) "ics_eoi: irq %#x"
# hw/ppc/spapr_iommu.c
spapr_iommu_put(uint64_t liobn, uint64_t ioba, uint64_t tce, uint64_t ret)
"liobn=%"PRIx64" ioba=0x%"PRIx64" tce=0x%"PRIx64" ret=%"PRId64
+spapr_iommu_get(uint64_t liobn, uint64_t ioba, uint64_t ret, uint64_t tce)
"liobn=%"PRIx64" ioba=0x%"PRIx64" ret=%"PRId64" tce=0x%"PRIx64
spapr_iommu_xlate(uint64_t liobn, uint64_t ioba, uint64_t tce, unsigned perm,
unsigned pgsize) "liobn=%"PRIx64" 0x%"PRIx64" -> 0x%"PRIx64" perm=%u mask=%x"
spapr_iommu_new_table(uint64_t liobn, void *tcet, void *table, int fd)
"liobn=%"PRIx64" tcet=%p table=%p fd=%d"
