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powerpc/pseries: Enable hvpipe with ibm,set-system-parameter RTAS

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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
This commit is contained in:
Haren Myneni 2025-09-09 01:44:00 -07:00 committed by Madhavan Srinivasan
parent b48b6cc8c6
commit 39a08a4f94
2 changed files with 33 additions and 2 deletions
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1
arch/powerpc/include/asm/papr-sysparm.h
View File

@ -21,6 +21,7 @@ typedef struct {
#define PAPR_SYSPARM_COOP_MEM_OVERCOMMIT_ATTRS mk_papr_sysparm(44) #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_TLB_BLOCK_INVALIDATE_ATTRS mk_papr_sysparm(50)
#define PAPR_SYSPARM_LPAR_NAME mk_papr_sysparm(55) #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. * struct papr_sysparm_buf - RTAS work area layout for system parameter functions.

30
arch/powerpc/platforms/pseries/papr-hvpipe.c
View File

@ -15,6 +15,7 @@
#include <asm/machdep.h> #include <asm/machdep.h>
#include <asm/rtas.h> #include <asm/rtas.h>
#include <asm/rtas-work-area.h> #include <asm/rtas-work-area.h>
#include <asm/papr-sysparm.h>
#include <uapi/asm/papr-hvpipe.h> #include <uapi/asm/papr-hvpipe.h>
#include "pseries.h" #include "pseries.h"
#include "papr-hvpipe.h" #include "papr-hvpipe.h"
@ -648,6 +649,32 @@ static irqreturn_t hvpipe_event_interrupt(int irq, void *dev_id)
return IRQ_HANDLED; 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) static int __init enable_hvpipe_IRQ(void)
{ {
struct device_node *np; struct device_node *np;
@ -705,8 +732,11 @@ static int __init papr_hvpipe_init(void)
} }
ret = enable_hvpipe_IRQ(); ret = enable_hvpipe_IRQ();
if (!ret) {
ret = set_hvpipe_sys_param(1);
if (!ret) if (!ret)
ret = misc_register(&papr_hvpipe_dev); ret = misc_register(&papr_hvpipe_dev);
}
if (!ret) { if (!ret) {
pr_info("hvpipe feature is enabled\n"); pr_info("hvpipe feature is enabled\n");