diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2020-05-07 21:48:24 +1000 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2020-05-27 15:27:25 +1000 |
| commit | fe837714f3462e02e856d441ea6e9a6a0aad4695 (patch) | |
| tree | b6902c86008e69532373a45eeda7d66a941cf321 /hw/ppc | |
| parent | ddc760832fa8cf5e93b9d9e6e854a5114ac63510 (diff) | |
ppc/pnv: Fix NMI system reset SRR1 value
Commit a77fed5bd926 ("ppc/pnv: Add support for NMI interface") got the
SRR1 setting wrong for sresets that hit outside of power-save states.
Fix this, better documenting the source for the bit definitions.
Fixes: 01b552b05b0f ("ppc/pnv: Add support for NMI interface")
Cc: Cédric Le Goater <clg@kaod.org>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20200507114824.788942-1-npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
[dwg: Fixed up some tab indentation]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'hw/ppc')
| -rw-r--r-- | hw/ppc/pnv.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c index da637822f9..f48a61d6d1 100644 --- a/hw/ppc/pnv.c +++ b/hw/ppc/pnv.c @@ -1984,12 +1984,26 @@ static void pnv_cpu_do_nmi_on_cpu(CPUState *cs, run_on_cpu_data arg) cpu_synchronize_state(cs); ppc_cpu_do_system_reset(cs); - /* - * SRR1[42:45] is set to 0100 which the ISA defines as implementation - * dependent. POWER processors use this for xscom triggered interrupts, - * which come from the BMC or NMI IPIs. - */ - env->spr[SPR_SRR1] |= PPC_BIT(43); + if (env->spr[SPR_SRR1] & PPC_BITMASK(46, 47)) { + /* + * Power-save wakeups, as indicated by non-zero SRR1[46:47] put the + * wakeup reason in SRR1[42:45], system reset is indicated with 0b0100 + * (PPC_BIT(43)). + */ + if (!(env->spr[SPR_SRR1] & PPC_BIT(43))) { + warn_report("ppc_cpu_do_system_reset does not set system reset wakeup reason"); + env->spr[SPR_SRR1] |= PPC_BIT(43); + } + } else { + /* + * For non-powersave system resets, SRR1[42:45] are defined to be + * implementation-dependent. The POWER9 User Manual specifies that + * an external (SCOM driven, which may come from a BMC nmi command or + * another CPU requesting a NMI IPI) system reset exception should be + * 0b0010 (PPC_BIT(44)). + */ + env->spr[SPR_SRR1] |= PPC_BIT(44); + } } static void pnv_nmi(NMIState *n, int cpu_index, Error **errp) |