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[SCSI] ipr: Reduce lock contention

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This patch reduces lock contention while implementing distributed
completion processing.

Signed-off-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
wenxiong@linux.vnet.ibm.com
2013-01-11 17:43:51 -06:00
committed by James Bottomley
parent 05a6538a9a
commit 56d6aa33d3
2 changed files with 240 additions and 104 deletions
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21
drivers/scsi/ipr.h
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@@ -482,17 +482,18 @@ struct ipr_hrr_queue {
struct list_head hrrq_free_q;
struct list_head hrrq_pending_q;
spinlock_t _lock;
spinlock_t *lock;
volatile u32 toggle_bit;
u32 size;
u32 min_cmd_id;
u32 max_cmd_id;
u8 allow_interrupts:1;
u8 ioa_is_dead:1;
u8 allow_cmds:1;
};
#define for_each_hrrq(hrrq, ioa_cfg) \
for (hrrq = (ioa_cfg)->hrrq; \
hrrq < ((ioa_cfg)->hrrq + (ioa_cfg)->hrrq_num); hrrq++)
/* Command packet structure */
struct ipr_cmd_pkt {
u8 reserved; /* Reserved by IOA */
@@ -1057,6 +1058,10 @@ struct ipr_hostrcb64_fabric_desc {
struct ipr_hostrcb64_config_element elem[1];
}__attribute__((packed, aligned (8)));
#define for_each_hrrq(hrrq, ioa_cfg) \
for (hrrq = (ioa_cfg)->hrrq; \
hrrq < ((ioa_cfg)->hrrq + (ioa_cfg)->hrrq_num); hrrq++)
#define for_each_fabric_cfg(fabric, cfg) \
for (cfg = (fabric)->elem; \
cfg < ((fabric)->elem + be16_to_cpu((fabric)->num_entries)); \
@@ -1411,13 +1416,10 @@ struct ipr_ioa_cfg {
struct list_head queue;
u8 allow_interrupts:1;
u8 in_reset_reload:1;
u8 in_ioa_bringdown:1;
u8 ioa_unit_checked:1;
u8 ioa_is_dead:1;
u8 dump_taken:1;
u8 allow_cmds:1;
u8 allow_ml_add_del:1;
u8 needs_hard_reset:1;
u8 dual_raid:1;
@@ -1449,7 +1451,7 @@ struct ipr_ioa_cfg {
char trace_start[8];
#define IPR_TRACE_START_LABEL "trace"
struct ipr_trace_entry *trace;
u32 trace_index:IPR_NUM_TRACE_INDEX_BITS;
atomic_t trace_index;
char cfg_table_start[8];
#define IPR_CFG_TBL_START "cfg"
@@ -1476,7 +1478,8 @@ struct ipr_ioa_cfg {
struct ipr_hrr_queue hrrq[IPR_MAX_HRRQ_NUM];
u32 hrrq_num;
u32 hrrq_index;
atomic_t hrrq_index;
u16 identify_hrrq_index;
struct ipr_bus_attributes bus_attr[IPR_MAX_NUM_BUSES];