diff options
| author | Uma Krishnan <ukrishn@linux.vnet.ibm.com> | 2018-03-26 11:35:00 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-04-18 19:32:50 -0400 |
| commit | f81face7256339c584ee9baba3240ddac74a0293 (patch) | |
| tree | 48e843b81cb84b32a72ea1b6ff617b396710ce6a /drivers/scsi/cxlflash/ocxl_hw.h | |
| parent | d91dd3a7d11a17a2e309a15e4765283212e30290 (diff) | |
scsi: cxlflash: Introduce OCXL context state machine
In order to protect the OCXL hardware contexts from getting clobbered, a
simple state machine is added to indicate when a context is in open, close or
start state. The expected states are validated throughout the code to prevent
illegal operations on a context. A mutex is added to protect writes to the
context state field.
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/cxlflash/ocxl_hw.h')
| -rw-r--r-- | drivers/scsi/cxlflash/ocxl_hw.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h index acd280135989..1829e55c974a 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.h +++ b/drivers/scsi/cxlflash/ocxl_hw.h @@ -46,6 +46,12 @@ struct ocxl_hw_afu { bool is_present; /* Function has AFUs defined */ }; +enum ocxlflash_ctx_state { + CLOSED, + OPENED, + STARTED +}; + struct ocxlflash_context { struct ocxl_hw_afu *hw_afu; /* HW AFU back pointer */ struct address_space *mapping; /* Mapping for pseudo filesystem */ @@ -57,6 +63,8 @@ struct ocxlflash_context { spinlock_t slock; /* Protects irq/fault/event updates */ wait_queue_head_t wq; /* Wait queue for poll and interrupts */ + struct mutex state_mutex; /* Mutex to update context state */ + enum ocxlflash_ctx_state state; /* Context state */ struct ocxlflash_irqs *irqs; /* Pointer to array of structures */ int num_irqs; /* Number of interrupts */ |