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nvme-pci: Add support for variable IO SQ element size 

The size of a submission queue element should always be 6 (64 bytes)
by spec.

However some controllers such as Apple's are not properly implementing
the standard and require a different size.

This provides the ground work for the subsequent quirks for these
controllers.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Benjamin Herrenschmidt 2019-08-07 17:51:20 +10:00 committed by Sagi Grimberg
parent 8a1d09a668
commit c1e0cc7e1d
2 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/nvme/host/pci.c
View File

@ -28,7 +28,7 @@
#include "trace.h"
#include "nvme.h"
#define SQ_SIZE(q) ((q)->q_depth * sizeof(struct nvme_command))
#define SQ_SIZE(q) ((q)->q_depth << (q)->sqes)
#define CQ_SIZE(q) ((q)->q_depth * sizeof(struct nvme_completion))
#define SGES_PER_PAGE (PAGE_SIZE / sizeof(struct nvme_sgl_desc))
@ -100,6 +100,7 @@ struct nvme_dev {
unsigned io_queues[HCTX_MAX_TYPES];
unsigned int num_vecs;
int q_depth;
int io_sqes;
u32 db_stride;
void __iomem *bar;
unsigned long bar_mapped_size;
@ -162,7 +163,7 @@ static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl)
struct nvme_queue {
struct nvme_dev *dev;
spinlock_t sq_lock;
struct nvme_command *sq_cmds;
void *sq_cmds;
/* only used for poll queues: */
spinlock_t cq_poll_lock ____cacheline_aligned_in_smp;
volatile struct nvme_completion *cqes;
@ -178,6 +179,7 @@ struct nvme_queue {
u16 last_cq_head;
u16 qid;
u8 cq_phase;
u8 sqes;
unsigned long flags;
#define NVMEQ_ENABLED 0
#define NVMEQ_SQ_CMB 1
@ -488,7 +490,8 @@ static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd,
bool write_sq)
{
spin_lock(&nvmeq->sq_lock);
memcpy(&nvmeq->sq_cmds[nvmeq->sq_tail], cmd, sizeof(*cmd));
memcpy(nvmeq->sq_cmds + (nvmeq->sq_tail << nvmeq->sqes),
cmd, sizeof(*cmd));
if (++nvmeq->sq_tail == nvmeq->q_depth)
nvmeq->sq_tail = 0;
nvme_write_sq_db(nvmeq, write_sq);
@ -1465,6 +1468,7 @@ static int nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth)
if (dev->ctrl.queue_count > qid)
return 0;
nvmeq->sqes = qid ? dev->io_sqes : NVME_ADM_SQES;
nvmeq->q_depth = depth;
nvmeq->cqes = dma_alloc_coherent(dev->dev, CQ_SIZE(nvmeq),
&nvmeq->cq_dma_addr, GFP_KERNEL);
@ -2317,6 +2321,7 @@ static int nvme_pci_enable(struct nvme_dev *dev)
dev->ctrl.sqsize = dev->q_depth - 1; /* 0's based queue depth */
dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap);
dev->dbs = dev->bar + 4096;
dev->io_sqes = NVME_NVM_IOSQES;
/*
* Temporary fix for the Apple controller found in the MacBook8,1 and

1
include/linux/nvme.h
View File

@ -140,6 +140,7 @@ enum {
* Submission and Completion Queue Entry Sizes for the NVM command set.
* (In bytes and specified as a power of two (2^n)).
*/
#define NVME_ADM_SQES 6
#define NVME_NVM_IOSQES 6
#define NVME_NVM_IOCQES 4