Commit 1c0eaf0f authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Michael Ellerman

powerpc/powernv: Tell OPAL about our MMU mode on POWER9

That will allow OPAL to configure the CPU in an optimal way.
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 1e2a516e
......@@ -876,6 +876,15 @@ struct OpalIoPhb4ErrorData {
enum {
OPAL_REINIT_CPUS_HILE_BE = (1 << 0),
OPAL_REINIT_CPUS_HILE_LE = (1 << 1),
/* These two define the base MMU mode of the host on P9
*
* On P9 Nimbus DD2.0 and Cumlus (and later), KVM can still
* create hash guests in "radix" mode with care (full core
* switch only).
*/
OPAL_REINIT_CPUS_MMU_HASH = (1 << 2),
OPAL_REINIT_CPUS_MMU_RADIX = (1 << 3),
};
typedef struct oppanel_line {
......
......@@ -59,6 +59,8 @@ static struct task_struct *kopald_tsk;
void opal_configure_cores(void)
{
u64 reinit_flags = 0;
/* Do the actual re-init, This will clobber all FPRs, VRs, etc...
*
* It will preserve non volatile GPRs and HSPRG0/1. It will
......@@ -66,11 +68,24 @@ void opal_configure_cores(void)
* but it might clobber a bunch.
*/
#ifdef __BIG_ENDIAN__
opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
reinit_flags |= OPAL_REINIT_CPUS_HILE_BE;
#else
opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
reinit_flags |= OPAL_REINIT_CPUS_HILE_LE;
#endif
/*
* POWER9 always support running hash:
* ie. Host hash supports hash guests
* Host radix supports hash/radix guests
*/
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH;
if (early_radix_enabled())
reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX;
}
opal_reinit_cpus(reinit_flags);
/* Restore some bits */
if (cur_cpu_spec->cpu_restore)
cur_cpu_spec->cpu_restore();
......
......@@ -225,6 +225,8 @@ static void pnv_kexec_wait_secondaries_down(void)
static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
{
u64 reinit_flags;
if (xive_enabled())
xive_kexec_teardown_cpu(secondary);
else
......@@ -254,8 +256,15 @@ static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
* We might be running as little-endian - now that interrupts
* are disabled, reset the HILE bit to big-endian so we don't
* take interrupts in the wrong endian later
*
* We reinit to enable both radix and hash on P9 to ensure
* the mode used by the next kernel is always supported.
*/
opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
if (cpu_has_feature(CPU_FTR_ARCH_300))
reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
OPAL_REINIT_CPUS_MMU_HASH;
opal_reinit_cpus(reinit_flags);
}
}
#endif /* CONFIG_KEXEC_CORE */
......
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