powerpc/pseries: Define HVPIPE specific macros

JIRA: https://issues.redhat.com/browse/RHEL-101849

Conflicts:
	backport upstream commit 26b4fce
	- RH 9.x commit ("powerpc/pseries: Add papr-vpd character driver for
	VPD retrieval") made changes to avoid backporting all of
	adf7a01 and some preceding commits it depends on (i.e. the
	table-based RTAS function lookup infrastructure introduced
	upstream by 8252b88 ("powerpc/rtas: improve function
	information lookups"). So this back-port ignored macros such as
	RTAS_FNIDX__IBM_*)
	- Change in find_rtas_mutex() to get mutexes for
	ibm,receive-hvpipe-msg and ibm,send-hvpipe-msg RTAS calls.

commit 26b4fce
Author: Haren Myneni <haren@linux.ibm.com>
Date:   Tue Sep 9 01:43:54 2025 -0700

    powerpc/pseries: Define HVPIPE specific macros

    Define HVPIPE specific macros which are needed to support
    ibm,send-hvpipe-msg and ibm,receive-hvpipe-msg RTAS calls
    and used to handle HVPIPE message events.

    Signed-off-by: Haren Myneni <haren@linux.ibm.com>
    Tested-by: Shashank MS <shashank.gowda@in.ibm.com>
    Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
    Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
    Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
    Link: https://patch.msgid.link/20250909084402.1488456-3-haren@linux.ibm.com

Signed-off-by: Mamatha Inamdar <minamdar@redhat.com>

Author: Mamatha Inamdar

arch/powerpc/include/asm/rtas.h

@@ -27,6 +27,7 @@
 #define RTAS_HARDWARE_ERROR	-1    /* Hardware Error */
 #define RTAS_BUSY		-2    /* RTAS Busy */
 #define RTAS_INVALID_PARAMETER	-3    /* Invalid indicator/domain/sensor etc. */
+#define	RTAS_FUNC_NOT_SUPPORTED	-5    /* Function not supported */
 #define RTAS_EXTENDED_DELAY_MIN	9900
 #define RTAS_EXTENDED_DELAY_MAX	9905
 
@@ -56,6 +57,7 @@
 #define RTAS_EPOW_WARNING		0x40000000 /* set bit 1 */
 #define RTAS_HOTPLUG_EVENTS		0x10000000 /* set bit 3 */
 #define RTAS_IO_EVENTS			0x08000000 /* set bit 4 */
+#define RTAS_HVPIPE_MSG_EVENTS		0x04000000 /* set bit 5 */
 #define RTAS_EVENT_SCAN_ALL_EVENTS	0xffffffff
 
 /* RTAS event severity */
@@ -105,6 +107,7 @@
 #define RTAS_TYPE_DEALLOC		0xE3
 #define RTAS_TYPE_DUMP			0xE4
 #define RTAS_TYPE_HOTPLUG		0xE5
+#define RTAS_TYPE_HVPIPE		0xE6
 /* I don't add PowerMGM events right now, this is a different topic */ 
 #define RTAS_TYPE_PMGM_POWER_SW_ON	0x60
 #define RTAS_TYPE_PMGM_POWER_SW_OFF	0x61
@@ -197,6 +200,7 @@ inline uint32_t rtas_ext_event_company_id(struct rtas_ext_event_log_v6 *ext_log)
 #define PSERIES_ELOG_SECT_ID_HMC_ID		(('H' << 8) | 'M')
 #define PSERIES_ELOG_SECT_ID_EPOW		(('E' << 8) | 'P')
 #define PSERIES_ELOG_SECT_ID_IO_EVENT		(('I' << 8) | 'E')
+#define PSERIES_ELOG_SECT_ID_HVPIPE_EVENT	(('P' << 8) | 'E')
 #define PSERIES_ELOG_SECT_ID_MANUFACT_INFO	(('M' << 8) | 'I')
 #define PSERIES_ELOG_SECT_ID_CALL_HOME		(('C' << 8) | 'H')
 #define PSERIES_ELOG_SECT_ID_USER_DEF		(('U' << 8) | 'D')
@@ -341,6 +345,7 @@ extern struct mutex rtas_ibm_get_indices_lock;
 extern struct mutex rtas_ibm_set_dynamic_indicator_lock;
 extern struct mutex rtas_ibm_get_dynamic_sensor_state_lock;
 extern struct mutex rtas_ibm_physical_attestation_lock;
+extern struct mutex rtas_ibm_send_hvpipe_msg_lock;
 
 #define GLOBAL_INTERRUPT_QUEUE 9005
 

arch/powerpc/kernel/rtas.c

@@ -81,6 +81,8 @@ DEFINE_MUTEX(rtas_ibm_get_vpd_lock);
 DEFINE_MUTEX(rtas_ibm_get_indices_lock);
 DEFINE_MUTEX(rtas_ibm_set_dynamic_indicator_lock);
 DEFINE_MUTEX(rtas_ibm_get_dynamic_sensor_state_lock);
+DEFINE_MUTEX(rtas_ibm_receive_hvpipe_msg_lock);
+DEFINE_MUTEX(rtas_ibm_send_hvpipe_msg_lock);
 
 /* RTAS use home made raw locking instead of spin_lock_irqsave
  * because those can be called from within really nasty contexts
@@ -1012,6 +1014,8 @@ static struct rtas_filter rtas_filters[] __ro_after_init = {
 	{ "ibm,update-properties", -1, 0, -1, -1, -1, 4096 },
 #endif
 	{ "ibm,physical-attestation", -1, 0, 1, -1, -1 },
+	{ "ibm,receive-hvpipe-msg", -1, 0, 1, -1, -1 },
+	{ "ibm,send-hvpipe-msg", -1, 1, -1, -1, -1 },
 };
 
 static bool in_rmo_buf(u32 base, u32 end)
@@ -1134,6 +1138,12 @@ static struct mutex *find_rtas_mutex(int token)
 	if (token == rtas_token("ibm,physical-attestation"))
 		return &rtas_ibm_physical_attestation_lock;
 
+	if (token == rtas_token("ibm,receive-hvpipe-msg"))
+		return &rtas_ibm_receive_hvpipe_msg_lock;
+
+	if (token == rtas_token("ibm,send-hvpipe-msg"))
+		return &rtas_ibm_send_hvpipe_msg_lock;
+
 	return NULL;
 }
 

arch/powerpc/kernel/rtasd.c

@@ -89,6 +89,8 @@ static char *rtas_event_type(int type)
 			return "Platform Resource Reassignment Event";
 		case RTAS_TYPE_HOTPLUG:
 			return "Hotplug Event";
+		case RTAS_TYPE_HVPIPE:
+			return "Hypervisor Pipe Notification event";
 	}
 
 	return rtas_type[0];