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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2022-06-22 15:29:55 +1000 |
|---|---|---|
| committer | Daniel Henrique Barboza <danielhb413@gmail.com> | 2022-07-06 10:22:37 -0300 |
| commit | 31cc81f72801bcda02c866ff94ed8baf6b84506d (patch) | |
| tree | d06e28ea747d49fc4f8dd1af05b9e62262745dff /hw | |
| parent | 59f11543e2ccd5cab283732a7c59aeeaa6790138 (diff) | |
| download | qemu-31cc81f72801bcda02c866ff94ed8baf6b84506d.zip qemu-31cc81f72801bcda02c866ff94ed8baf6b84506d.tar.gz qemu-31cc81f72801bcda02c866ff94ed8baf6b84506d.tar.bz2 | |
spapr/ddw: Reset DMA when the last non-default window is removed
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>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/ppc/spapr_iommu.c | 3 | ||||
| -rw-r--r-- | hw/ppc/spapr_pci.c | 1 | ||||
| -rw-r--r-- | hw/ppc/spapr_rtas_ddw.c | 15 |
3 files changed, 18 insertions, 1 deletions
diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c index 81e5a1a..63e34d4 100644 --- a/hw/ppc/spapr_iommu.c +++ b/hw/ppc/spapr_iommu.c @@ -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() }, diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c index b2f5fbe..5e95d79 100644 --- a/hw/ppc/spapr_pci.c +++ b/hw/ppc/spapr_pci.c @@ -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) diff --git a/hw/ppc/spapr_rtas_ddw.c b/hw/ppc/spapr_rtas_ddw.c index 13d339c..bb7d91b 100644 --- a/hw/ppc/spapr_rtas_ddw.c +++ b/hw/ppc/spapr_rtas_ddw.c @@ -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; |