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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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8129ee1642
New feature V=V qdio pass-through. QDIO and HiperSockets processing in z/VM V=V guest environments (as well as V=R with z/VM running in LPAR mode) requires shadowing of all QDIO architecture queue elements. Especially the shadowing of SBALs and SLSBs structures in the hypervisor, and the need to issue SIGA SYNC operations to observe state changes, eventually causes significant CPU processing overhead in the hypervisor. The QDIO pass-through support for V=V guests avoids the shadowing of SBALs and SLSBs. This significantly reduces the hypervisor overhead for QDIO based I/O. Signed-off-by: Frank Pavlic <pavlic@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
#ifndef S390_CHSC_H
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#define S390_CHSC_H
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#define NR_CHPIDS 256
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#define CHSC_SEI_ACC_CHPID 1
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#define CHSC_SEI_ACC_LINKADDR 2
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#define CHSC_SEI_ACC_FULLLINKADDR 3
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struct chsc_header {
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u16 length;
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u16 code;
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};
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struct channel_path_desc {
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u8 flags;
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u8 lsn;
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u8 desc;
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u8 chpid;
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u8 swla;
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u8 zeroes;
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u8 chla;
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u8 chpp;
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};
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struct channel_path {
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int id;
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int state;
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struct channel_path_desc desc;
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struct device dev;
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};
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extern void s390_process_css( void );
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extern void chsc_validate_chpids(struct subchannel *);
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extern void chpid_is_actually_online(int);
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struct css_general_char {
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u64 : 41;
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u32 aif : 1; /* bit 41 */
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u32 : 3;
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u32 mcss : 1; /* bit 45 */
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u32 : 2;
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u32 ext_mb : 1; /* bit 48 */
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u32 : 7;
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u32 aif_tdd : 1; /* bit 56 */
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u32 : 1;
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u32 qebsm : 1; /* bit 58 */
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u32 : 8;
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u32 aif_osa : 1; /* bit 67 */
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u32 : 28;
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}__attribute__((packed));
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struct css_chsc_char {
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u64 res;
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u64 : 43;
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u32 scssc : 1; /* bit 107 */
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u32 scsscf : 1; /* bit 108 */
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u32 : 19;
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}__attribute__((packed));
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extern struct css_general_char css_general_characteristics;
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extern struct css_chsc_char css_chsc_characteristics;
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extern int chsc_determine_css_characteristics(void);
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extern int css_characteristics_avail;
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extern void *chsc_get_chp_desc(struct subchannel*, int);
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#endif
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