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spapr/ddw: Reset DMA when the last non-default window is removed

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PAPR+/LoPAPR says:
===
The platform must restore the default DMA window for the PE on a call
to the ibm,remove-pe-dma-window RTAS call when all of the following
are true:
 a. The call removes the last DMA window remaining for the PE.
 b. The DMA window being removed is not the default window

===

This resets DMA as PAPR mandates.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20220622052955.1069903-1-aik@ozlabs.ru>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Alexey Kardashevskiy 2022-06-22 15:29:55 +10:00 committed by Daniel Henrique Barboza
parent 59f11543e2
commit 31cc81f728
4 changed files with 19 additions and 1 deletions
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3
hw/ppc/spapr_iommu.c
View file

@ -279,7 +279,7 @@ static const VMStateDescription vmstate_spapr_tce_table_ex = {
static const VMStateDescription vmstate_spapr_tce_table = {
.name = "spapr_iommu",
.version_id = 2,
.version_id = 3,
.minimum_version_id = 2,
.pre_save = spapr_tce_table_pre_save,
.post_load = spapr_tce_table_post_load,
@ -292,6 +292,7 @@ static const VMStateDescription vmstate_spapr_tce_table = {
VMSTATE_BOOL(bypass, SpaprTceTable),
VMSTATE_VARRAY_UINT32_ALLOC(mig_table, SpaprTceTable, mig_nb_table, 0,
vmstate_info_uint64, uint64_t),
VMSTATE_BOOL_V(def_win, SpaprTceTable, 3),
VMSTATE_END_OF_LIST()
},

1
hw/ppc/spapr_pci.c
View file

@ -2067,6 +2067,7 @@ void spapr_phb_dma_reset(SpaprPhbState *sphb)
tcet = spapr_tce_find_by_liobn(sphb->dma_liobn[0]);
spapr_tce_table_enable(tcet, SPAPR_TCE_PAGE_SHIFT, sphb->dma_win_addr,
sphb->dma_win_size >> SPAPR_TCE_PAGE_SHIFT);
tcet->def_win = true;
}
static void spapr_phb_reset(DeviceState *qdev)

15
hw/ppc/spapr_rtas_ddw.c
View file

@ -215,6 +215,7 @@ static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu,
SpaprPhbState *sphb;
SpaprTceTable *tcet;
uint32_t liobn;
bool def_win_removed;
if ((nargs != 1) || (nret != 1)) {
goto param_error_exit;
@ -231,9 +232,23 @@ static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu,
goto param_error_exit;
}
def_win_removed = tcet->def_win;
spapr_tce_table_disable(tcet);
trace_spapr_iommu_ddw_remove(liobn);
/*
* PAPR+/LoPAPR says:
* The platform must restore the default DMA window for the PE on a call
* to the ibm,remove-pe-dma-window RTAS call when all of the following
* are true:
* a. The call removes the last DMA window remaining for the PE.
* b. The DMA window being removed is not the default window
*/
if (spapr_phb_get_active_win_num(sphb) == 0 && !def_win_removed) {
spapr_phb_dma_reset(sphb);
trace_spapr_iommu_ddw_reset(sphb->buid, 0);
}
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
return;

1
include/hw/ppc/spapr.h
View file

@ -902,6 +902,7 @@ struct SpaprTceTable {
bool bypass;
bool need_vfio;
bool skipping_replay;
bool def_win;
int fd;
MemoryRegion root;
IOMMUMemoryRegion iommu;