diff mbox series

[v5,09/17] powerpc/vas: Define QoS credit flag to allocate window

Message ID 64c8e95b25f58c5e05c98765dab2bc8eb9b1483d.camel@linux.ibm.com
State Superseded
Headers show
Series [v5,01/17] powerpc/powernv/vas: Release reference to tgid during window close | expand

Commit Message

Haren Myneni June 13, 2021, 11 a.m. UTC
PowerVM introduces two different type of credits: Default and Quality
of service (QoS).

The total number of default credits available on each LPAR depends
on CPU resources configured. But these credits can be shared or
over-committed across LPARs in shared mode which can result in
paste command failure (RMA_busy). To avoid NX HW contention, the
hypervisor ntroduces QoS credit type which makes sure guaranteed
access to NX esources. The system admins can assign QoS credits
or each LPAR via HMC.

Default credit type is used to allocate a VAS window by default as
on PowerVM implementation. But the process can pass
VAS_TX_WIN_FLAG_QOS_CREDIT flag with VAS_TX_WIN_OPEN ioctl to open
QoS type window.

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
---
 arch/powerpc/include/uapi/asm/vas-api.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Comments

Nicholas Piggin June 14, 2021, 2:32 a.m. UTC | #1
Excerpts from Haren Myneni's message of June 13, 2021 9:00 pm:
> 

> PowerVM introduces two different type of credits: Default and Quality

> of service (QoS).

> 

> The total number of default credits available on each LPAR depends

> on CPU resources configured. But these credits can be shared or

> over-committed across LPARs in shared mode which can result in

> paste command failure (RMA_busy). To avoid NX HW contention, the

> hypervisor ntroduces QoS credit type which makes sure guaranteed

> access to NX esources. The system admins can assign QoS credits

> or each LPAR via HMC.

> 

> Default credit type is used to allocate a VAS window by default as

> on PowerVM implementation. But the process can pass

> VAS_TX_WIN_FLAG_QOS_CREDIT flag with VAS_TX_WIN_OPEN ioctl to open

> QoS type window.

> 

> Signed-off-by: Haren Myneni <haren@linux.ibm.com>


Flag name looks good now. Again I don't have the spec, so

Acked-by: Nicholas Piggin <npiggin@gmail.com>


Thanks,
Nick

> ---

>  arch/powerpc/include/uapi/asm/vas-api.h | 6 +++++-

>  1 file changed, 5 insertions(+), 1 deletion(-)

> 

> diff --git a/arch/powerpc/include/uapi/asm/vas-api.h b/arch/powerpc/include/uapi/asm/vas-api.h

> index ebd4b2424785..7c81301ecdba 100644

> --- a/arch/powerpc/include/uapi/asm/vas-api.h

> +++ b/arch/powerpc/include/uapi/asm/vas-api.h

> @@ -13,11 +13,15 @@

>  #define VAS_MAGIC	'v'

>  #define VAS_TX_WIN_OPEN	_IOW(VAS_MAGIC, 0x20, struct vas_tx_win_open_attr)

>  

> +/* Flags to VAS TX open window ioctl */

> +/* To allocate a window with QoS credit, otherwise use default credit */

> +#define VAS_TX_WIN_FLAG_QOS_CREDIT	0x0000000000000001

> +

>  struct vas_tx_win_open_attr {

>  	__u32	version;

>  	__s16	vas_id;	/* specific instance of vas or -1 for default */

>  	__u16	reserved1;

> -	__u64	flags;	/* Future use */

> +	__u64	flags;

>  	__u64	reserved2[6];

>  };

>  

> -- 

> 2.18.2

> 

> 

>
diff mbox series

Patch

diff --git a/arch/powerpc/include/uapi/asm/vas-api.h b/arch/powerpc/include/uapi/asm/vas-api.h
index ebd4b2424785..7c81301ecdba 100644
--- a/arch/powerpc/include/uapi/asm/vas-api.h
+++ b/arch/powerpc/include/uapi/asm/vas-api.h
@@ -13,11 +13,15 @@ 
 #define VAS_MAGIC	'v'
 #define VAS_TX_WIN_OPEN	_IOW(VAS_MAGIC, 0x20, struct vas_tx_win_open_attr)
 
+/* Flags to VAS TX open window ioctl */
+/* To allocate a window with QoS credit, otherwise use default credit */
+#define VAS_TX_WIN_FLAG_QOS_CREDIT	0x0000000000000001
+
 struct vas_tx_win_open_attr {
 	__u32	version;
 	__s16	vas_id;	/* specific instance of vas or -1 for default */
 	__u16	reserved1;
-	__u64	flags;	/* Future use */
+	__u64	flags;
 	__u64	reserved2[6];
 };