diff mbox series

[PULL,02/35] ppc: Add stub implementation of TRIG SPRs

Message ID 20230904090630.725952-3-clg@kaod.org
State New
Headers show
Series [PULL,01/35] target/ppc: Generate storage interrupts for radix RC changes | expand

Commit Message

Cédric Le Goater Sept. 4, 2023, 9:05 a.m. UTC 
From: Joel Stanley <joel@jms.id.au>

Linux sets these to control cache flush behaviour on Power9. Supervisor
and hypervisor are allowed to write, and reads are noops.

Add implementations to avoid noisy messages when booting Linux under the
pseries machine with guest_errors enabled.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/cpu.h      |  2 ++
 target/ppc/cpu_init.c | 10 ++++++++++
 2 files changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 25fac9577aa4..6826702ea658 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1897,7 +1897,9 @@  void ppc_compat_add_property(Object *obj, const char *name,
 #define SPR_PSSCR             (0x357)
 #define SPR_440_INV0          (0x370)
 #define SPR_440_INV1          (0x371)
+#define SPR_TRIG1             (0x371)
 #define SPR_440_INV2          (0x372)
+#define SPR_TRIG2             (0x372)
 #define SPR_440_INV3          (0x373)
 #define SPR_440_ITV0          (0x374)
 #define SPR_440_ITV1          (0x375)
diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 02b7aad9b0e3..3b6ccb5ea4e6 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -5660,6 +5660,16 @@  static void register_power_common_book4_sprs(CPUPPCState *env)
                  SPR_NOACCESS, SPR_NOACCESS,
                  &spr_read_tfmr, &spr_write_tfmr,
                  0x00000000);
+    spr_register_hv(env, SPR_TRIG1, "TRIG1",
+                 SPR_NOACCESS, SPR_NOACCESS,
+                 &spr_access_nop, &spr_write_generic,
+                 &spr_access_nop, &spr_write_generic,
+                 0x00000000);
+    spr_register_hv(env, SPR_TRIG2, "TRIG2",
+                 SPR_NOACCESS, SPR_NOACCESS,
+                 &spr_access_nop, &spr_write_generic,
+                 &spr_access_nop, &spr_write_generic,
+                 0x00000000);
 #endif
 }