powerpc/powernv: Set the PTCR for the Nest MMU
The Nest MMU manages address translation for accelerators on the POWER9. To do so, it needs a page table, so export the system page table to the Nest MMU. This will quietly fail on pre-POWER9 systems that do not have a NMMU. The NMMU is currently unused, so this change is currently effectively a NOP, but the NMMU and VAS will eventually be used.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=355783
@ -91,6 +91,7 @@ int opal_call(uint64_t token, ...);
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#define OPAL_INT_EOI 124
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#define OPAL_INT_SET_MFRR 125
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#define OPAL_PCI_TCE_KILL 126
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#define OPAL_NMMU_SET_PTCR 127
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#define OPAL_XIVE_RESET 128
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#define OPAL_XIVE_GET_IRQ_INFO 129
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#define OPAL_XIVE_GET_IRQ_CONFIG 130
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@ -494,3 +494,14 @@ static void
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powernv_cpu_idle(sbintime_t sbt)
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{
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}
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/* Set up the Nest MMU on POWER9 relatively early, but after pmap is setup. */
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static void
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powernv_setup_nmmu(void *unused)
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{
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if (opal_check() != 0)
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return;
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opal_call(OPAL_NMMU_SET_PTCR, -1, mfspr(SPR_PTCR));
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}
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SYSINIT(powernv_setup_nmmu, SI_SUB_CPU, SI_ORDER_ANY, powernv_setup_nmmu, NULL);
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