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scsi: cxlflash: Add hardware queues attribute

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As staging for supporting multiple hardware queues, add an attribute to show
and set the current number of hardware queues for the host. Support specifying
a hard limit or a CPU affinitized value. This will allow the number of
hardware queues to be tuned by a system administrator.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Matthew R. Ochs
2017-04-12 14:15:53 -05:00
committed by Martin K. Petersen
parent bfc0bab172
commit 3065267a80
2 changed files with 106 additions and 16 deletions
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10
drivers/scsi/cxlflash/common.h
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@@ -60,7 +60,9 @@ extern const struct file_operations cxlflash_cxl_fops;
/* SQ for master issued cmds */
#define NUM_SQ_ENTRY CXLFLASH_MAX_CMDS
#define CXLFLASH_NUM_HWQS 1
/* Hardware queue definitions */
#define CXLFLASH_DEF_HWQS 1
#define CXLFLASH_MAX_HWQS 8
#define PRIMARY_HWQ 0
@@ -201,7 +203,7 @@ struct hwq {
} __aligned(cache_line_size());
struct afu {
struct hwq hwqs[CXLFLASH_NUM_HWQS];
struct hwq hwqs[CXLFLASH_MAX_HWQS];
int (*send_cmd)(struct afu *, struct afu_cmd *);
void (*context_reset)(struct afu_cmd *);
@@ -211,6 +213,8 @@ struct afu {
atomic_t cmds_active; /* Number of currently active AFU commands */
u64 hb;
u32 internal_lun; /* User-desired LUN mode for this AFU */
u32 num_hwqs; /* Number of hardware queues */
u32 desired_hwqs; /* Desired h/w queues, effective on AFU reset */
char version[16];
u64 interface_version;
@@ -221,7 +225,7 @@ struct afu {
static inline struct hwq *get_hwq(struct afu *afu, u32 index)
{
WARN_ON(index >= CXLFLASH_NUM_HWQS);
WARN_ON(index >= CXLFLASH_MAX_HWQS);
return &afu->hwqs[index];
}