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ibmvscsis: Enable Logical Partition Migration Support

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Changes to support a new mechanism from phyp to better synchronize the
logical partition migration (LPM) of the client partition.
This includes a new VIOCTL to register that we support this new
functionality, and 2 new Transport Event types, and finally another
new VIOCTL to let phyp know once we're ready for the Suspend.

Signed-off-by: Michael Cyr <mikecyr@us.ibm.com>
Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Michael Cyr
2017-05-16 17:49:21 -05:00
committed by Nicholas Bellinger
parent 12bdcbd539
commit 464fd6419c
3 changed files with 162 additions and 16 deletions
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25
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h
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@@ -262,6 +262,14 @@ struct scsi_info {
#define DISCONNECT_SCHEDULED 0x00800
/* remove function is sleeping */
#define CFG_SLEEPING 0x01000
/* Register for Prepare for Suspend Transport Events */
#define PREP_FOR_SUSPEND_ENABLED 0x02000
/* Prepare for Suspend event sent */
#define PREP_FOR_SUSPEND_PENDING 0x04000
/* Resume from Suspend event sent */
#define PREP_FOR_SUSPEND_ABORTED 0x08000
/* Prepare for Suspend event overwrote another CRQ entry */
#define PREP_FOR_SUSPEND_OVERWRITE 0x10000
u32 flags;
/* adapter lock */
spinlock_t intr_lock;
@@ -272,6 +280,7 @@ struct scsi_info {
/* used in crq, to tag what iu the response is for */
u64 empty_iu_tag;
uint new_state;
uint resume_state;
/* control block for the response queue timer */
struct timer_cb rsp_q_timer;
/* keep last client to enable proper accounting */
@@ -324,8 +333,13 @@ struct scsi_info {
#define TARGET_STOP(VSCSI) (long)(((VSCSI)->state & DONT_PROCESS_STATE) | \
((VSCSI)->flags & BLOCK))
#define PREP_FOR_SUSPEND_FLAGS (PREP_FOR_SUSPEND_ENABLED | \
PREP_FOR_SUSPEND_PENDING | \
PREP_FOR_SUSPEND_ABORTED | \
PREP_FOR_SUSPEND_OVERWRITE)
/* flag bit that are not reset during disconnect */
#define PRESERVE_FLAG_FIELDS 0
#define PRESERVE_FLAG_FIELDS (PREP_FOR_SUSPEND_FLAGS)
#define vio_iu(IUE) ((union viosrp_iu *)((IUE)->sbuf->buf))
@@ -333,8 +347,15 @@ struct scsi_info {
#define WRITE_CMD(cdb) (((cdb)[0] & 0x1F) == 0xA)
#ifndef H_GET_PARTNER_INFO
#define H_GET_PARTNER_INFO 0x0000000000000008LL
#define H_GET_PARTNER_INFO 0x0000000000000008LL
#endif
#ifndef H_ENABLE_PREPARE_FOR_SUSPEND
#define H_ENABLE_PREPARE_FOR_SUSPEND 0x000000000000001DLL
#endif
#ifndef H_READY_FOR_SUSPEND
#define H_READY_FOR_SUSPEND 0x000000000000001ELL
#endif
#define h_copy_rdma(l, sa, sb, da, db) \
plpar_hcall_norets(H_COPY_RDMA, l, sa, sb, da, db)