diff options
Diffstat (limited to 'drivers/misc/sgi-xp/xp.h')
| -rw-r--r-- | drivers/misc/sgi-xp/xp.h | 53 |
1 files changed, 35 insertions, 18 deletions
diff --git a/drivers/misc/sgi-xp/xp.h b/drivers/misc/sgi-xp/xp.h index 867fb4863d5a..51087e111887 100644 --- a/drivers/misc/sgi-xp/xp.h +++ b/drivers/misc/sgi-xp/xp.h @@ -18,6 +18,9 @@ #include <linux/mutex.h> #include <asm/sn/types.h> #include <asm/sn/bte.h> +#ifdef CONFIG_IA64 +#include <asm/sn/arch.h> +#endif /* >>> Add this #define to some linux header file some day. */ #define BYTES_PER_WORD sizeof(void *) @@ -45,17 +48,18 @@ #endif /* - * Define the maximum number of logically defined partitions the system - * can support. It is constrained by the maximum number of hardware - * partitionable regions. The term 'region' in this context refers to the - * minimum number of nodes that can comprise an access protection grouping. - * The access protection is in regards to memory, IPI and IOI. + * Define the maximum number of partitions the system can possibly support. + * It is based on the maximum number of hardware partitionable regions. The + * term 'region' in this context refers to the minimum number of nodes that + * can comprise an access protection grouping. The access protection is in + * regards to memory, IPI and IOI. * * The maximum number of hardware partitionable regions is equal to the * maximum number of nodes in the entire system divided by the minimum number * of nodes that comprise an access protection grouping. */ -#define XP_MAX_PARTITIONS 64 +#define XP_MAX_NPARTITIONS_SN2 64 +#define XP_MAX_NPARTITIONS_UV 256 /* * Define the number of u64s required to represent all the C-brick nasids @@ -112,24 +116,28 @@ xp_bte_copy(u64 src, u64 vdst, u64 len, u64 mode, void *notification) * other partition that is currently up. Over these channels, kernel-level * `users' can communicate with their counterparts on the other partitions. * - * The maxinum number of channels is limited to eight. For performance reasons, - * the internal cross partition structures require sixteen bytes per channel, - * and eight allows all of this interface-shared info to fit in one cache line. +>>> The following described limitation of a max of eight channels possible +>>> pertains only to ia64-sn2. THIS ISN'T TRUE SINCE I'M PLANNING TO JUST +>>> TIE INTO THE EXISTING MECHANISM ONCE THE CHANNEL MESSAGES ARE RECEIVED. +>>> THE 128-BYTE CACHELINE PERFORMANCE ISSUE IS TIED TO IA64-SN2. * - * XPC_NCHANNELS reflects the total number of channels currently defined. * If the need for additional channels arises, one can simply increase - * XPC_NCHANNELS accordingly. If the day should come where that number - * exceeds the MAXIMUM number of channels allowed (eight), then one will need - * to make changes to the XPC code to allow for this. + * XPC_MAX_NCHANNELS accordingly. If the day should come where that number + * exceeds the absolute MAXIMUM number of channels possible (eight), then one + * will need to make changes to the XPC code to accommodate for this. + * + * The absolute maximum number of channels possible is currently limited to + * eight for performance reasons. The internal cross partition structures + * require sixteen bytes per channel, and eight allows all of this + * interface-shared info to fit in one 128-byte cacheline. */ #define XPC_MEM_CHANNEL 0 /* memory channel number */ #define XPC_NET_CHANNEL 1 /* network channel number */ -#define XPC_NCHANNELS 2 /* #of defined channels */ -#define XPC_MAX_NCHANNELS 8 /* max #of channels allowed */ +#define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */ -#if XPC_NCHANNELS > XPC_MAX_NCHANNELS -#error XPC_NCHANNELS exceeds MAXIMUM allowed. +#if XPC_MAX_NCHANNELS > 8 +#error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible. #endif /* @@ -254,7 +262,8 @@ enum xp_retval { xpBteCopyError, /* 52: bte_copy() returned error */ xpSalError, /* 53: sn SAL error */ - xpUnknownReason /* 54: unknown reason - must be last in enum */ + xpUnsupported, /* 54: unsupported functionality or resource */ + xpUnknownReason /* 55: unknown reason - must be last in enum */ }; /* @@ -397,8 +406,16 @@ xpc_partid_to_nasids(short partid, void *nasids) return xpc_interface.partid_to_nasids(partid, nasids); } +extern short xp_max_npartitions; + extern u64 xp_nofault_PIOR_target; extern int xp_nofault_PIOR(void *); extern int xp_error_PIOR(void); +extern struct device *xp; +extern enum xp_retval xp_init_sn2(void); +extern enum xp_retval xp_init_uv(void); +extern void xp_exit_sn2(void); +extern void xp_exit_uv(void); + #endif /* _DRIVERS_MISC_SGIXP_XP_H */ |