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target-ppc: Introduce hypervisor call H_GET_TCE

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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 <ldufour@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Laurent Dufour 2014-02-21 10:29:06 +01:00 committed by Alexander Graf
parent c138593380
commit a0fcac9c21
2 changed files with 38 additions and 0 deletions
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37
hw/ppc/spapr_iommu.c
View File

@ -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 = {

1
trace-events
View File

@ -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"