diff options
| author | Haren Myneni <haren@linux.ibm.com> | 2025-09-09 01:44:00 -0700 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2025-09-15 13:38:40 +0530 |
| commit | 39a08a4f94980518ef2eca3c6c6b61094c99f1af (patch) | |
| tree | 0a2563378cb758edb160abb2589ab1d5d9805af4 | |
| parent | b48b6cc8c655d8cdcf5124ba9901b74c8f759668 (diff) | |
powerpc/pseries: Enable hvpipe with ibm,set-system-parameter RTAS
The partition uses “Hypervisor Pipe OS Enablement Notification”
system parameter token (value = 64) to enable / disable hvpipe in
the hypervisor. Once hvpipe is enabled, the hypervisor notifies
OS if the payload is pending for that partition from any source.
This system parameter token takes 1 byte length of data with
1 = Enable and 0 = Disable.
Enable hvpipe in the hypervisor with ibm,set-system-parameter
RTAS after registering hvpipe event source interrupt.
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/20250909084402.1488456-9-haren@linux.ibm.com
| -rw-r--r-- | arch/powerpc/include/asm/papr-sysparm.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/papr-hvpipe.c | 34 |
2 files changed, 33 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/papr-sysparm.h b/arch/powerpc/include/asm/papr-sysparm.h index c3cd5b131033..a3b5a0d05db6 100644 --- a/arch/powerpc/include/asm/papr-sysparm.h +++ b/arch/powerpc/include/asm/papr-sysparm.h @@ -21,6 +21,7 @@ typedef struct { #define PAPR_SYSPARM_COOP_MEM_OVERCOMMIT_ATTRS mk_papr_sysparm(44) #define PAPR_SYSPARM_TLB_BLOCK_INVALIDATE_ATTRS mk_papr_sysparm(50) #define PAPR_SYSPARM_LPAR_NAME mk_papr_sysparm(55) +#define PAPR_SYSPARM_HVPIPE_ENABLE mk_papr_sysparm(64) /** * struct papr_sysparm_buf - RTAS work area layout for system parameter functions. diff --git a/arch/powerpc/platforms/pseries/papr-hvpipe.c b/arch/powerpc/platforms/pseries/papr-hvpipe.c index eb312594b1f0..65368dbb134b 100644 --- a/arch/powerpc/platforms/pseries/papr-hvpipe.c +++ b/arch/powerpc/platforms/pseries/papr-hvpipe.c @@ -15,6 +15,7 @@ #include <asm/machdep.h> #include <asm/rtas.h> #include <asm/rtas-work-area.h> +#include <asm/papr-sysparm.h> #include <uapi/asm/papr-hvpipe.h> #include "pseries.h" #include "papr-hvpipe.h" @@ -648,6 +649,32 @@ static irqreturn_t hvpipe_event_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +/* + * Enable hvpipe by system parameter set with parameter + * token = 64 and with 1 byte buffer data: + * 0 = hvpipe not in use/disable + * 1 = hvpipe in use/enable + */ +static int set_hvpipe_sys_param(u8 val) +{ + struct papr_sysparm_buf *buf; + int ret; + + buf = papr_sysparm_buf_alloc(); + if (!buf) + return -ENOMEM; + + buf->len = cpu_to_be16(1); + buf->val[0] = val; + ret = papr_sysparm_set(PAPR_SYSPARM_HVPIPE_ENABLE, buf); + if (ret) + pr_err("Can not enable hvpipe %d\n", ret); + + papr_sysparm_buf_free(buf); + + return ret; +} + static int __init enable_hvpipe_IRQ(void) { struct device_node *np; @@ -705,8 +732,11 @@ static int __init papr_hvpipe_init(void) } ret = enable_hvpipe_IRQ(); - if (!ret) - ret = misc_register(&papr_hvpipe_dev); + if (!ret) { + ret = set_hvpipe_sys_param(1); + if (!ret) + ret = misc_register(&papr_hvpipe_dev); + } if (!ret) { pr_info("hvpipe feature is enabled\n"); |