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block/nvme: Pair doorbell registers 

For each queue doorbell registers are paired as:
- Submission Queue Tail Doorbell
- Completion Queue Head Doorbell

Reflect that in the NVMeRegs structure, and adapt
nvme_create_queue_pair() accordingly.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200904124130.583838-4-philmd@redhat.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Fam Zheng <fam@euphon.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2020-09-04 14:41:30 +02:00 committed by Kevin Wolf
parent c7100f0a0b
commit e5ff22ba9f
1 changed files with 6 additions and 3 deletions
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9
block/nvme.c
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@ -84,7 +84,10 @@ typedef struct {
/* Memory mapped registers */
typedef volatile struct {
NvmeBar ctrl;
uint32_t doorbells[];
struct {
uint32_t sq_tail;
uint32_t cq_head;
} doorbells[];
} NVMeRegs;
#define INDEX_ADMIN 0
@ -244,14 +247,14 @@ static NVMeQueuePair *nvme_create_queue_pair(BDRVNVMeState *s,
error_propagate(errp, local_err);
goto fail;
}
q->sq.doorbell = &s->regs->doorbells[idx * 2 * s->doorbell_scale];
q->sq.doorbell = &s->regs->doorbells[idx * s->doorbell_scale].sq_tail;
nvme_init_queue(s, &q->cq, size, NVME_CQ_ENTRY_BYTES, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto fail;
}
q->cq.doorbell = &s->regs->doorbells[(idx * 2 + 1) * s->doorbell_scale];
q->cq.doorbell = &s->regs->doorbells[idx * s->doorbell_scale].cq_head;
return q;
fail: