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>
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@ -28,7 +28,7 @@
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#include "trace.h"
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#include "trace.h"
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#include "nvme.h"
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#include "nvme.h"
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#define SQ_SIZE(q) ((q)->q_depth * sizeof(struct nvme_command))
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#define SQ_SIZE(q) ((q)->q_depth << (q)->sqes)
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#define CQ_SIZE(q) ((q)->q_depth * sizeof(struct nvme_completion))
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#define CQ_SIZE(q) ((q)->q_depth * sizeof(struct nvme_completion))
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#define SGES_PER_PAGE (PAGE_SIZE / sizeof(struct nvme_sgl_desc))
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#define SGES_PER_PAGE (PAGE_SIZE / sizeof(struct nvme_sgl_desc))
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@ -100,6 +100,7 @@ struct nvme_dev {
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unsigned io_queues[HCTX_MAX_TYPES];
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unsigned io_queues[HCTX_MAX_TYPES];
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unsigned int num_vecs;
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unsigned int num_vecs;
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int q_depth;
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int q_depth;
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int io_sqes;
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u32 db_stride;
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u32 db_stride;
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void __iomem *bar;
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void __iomem *bar;
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unsigned long bar_mapped_size;
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unsigned long bar_mapped_size;
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@ -162,7 +163,7 @@ static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl)
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struct nvme_queue {
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struct nvme_queue {
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struct nvme_dev *dev;
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struct nvme_dev *dev;
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spinlock_t sq_lock;
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spinlock_t sq_lock;
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struct nvme_command *sq_cmds;
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void *sq_cmds;
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/* only used for poll queues: */
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/* only used for poll queues: */
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spinlock_t cq_poll_lock ____cacheline_aligned_in_smp;
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spinlock_t cq_poll_lock ____cacheline_aligned_in_smp;
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volatile struct nvme_completion *cqes;
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volatile struct nvme_completion *cqes;
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@ -178,6 +179,7 @@ struct nvme_queue {
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u16 last_cq_head;
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u16 last_cq_head;
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u16 qid;
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u16 qid;
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u8 cq_phase;
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u8 cq_phase;
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u8 sqes;
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unsigned long flags;
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unsigned long flags;
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#define NVMEQ_ENABLED 0
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#define NVMEQ_ENABLED 0
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#define NVMEQ_SQ_CMB 1
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#define NVMEQ_SQ_CMB 1
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@ -488,7 +490,8 @@ static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd,
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bool write_sq)
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bool write_sq)
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{
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{
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spin_lock(&nvmeq->sq_lock);
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spin_lock(&nvmeq->sq_lock);
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memcpy(&nvmeq->sq_cmds[nvmeq->sq_tail], cmd, sizeof(*cmd));
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memcpy(nvmeq->sq_cmds + (nvmeq->sq_tail << nvmeq->sqes),
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cmd, sizeof(*cmd));
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if (++nvmeq->sq_tail == nvmeq->q_depth)
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if (++nvmeq->sq_tail == nvmeq->q_depth)
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nvmeq->sq_tail = 0;
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nvmeq->sq_tail = 0;
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nvme_write_sq_db(nvmeq, write_sq);
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nvme_write_sq_db(nvmeq, write_sq);
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@ -1465,6 +1468,7 @@ static int nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth)
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if (dev->ctrl.queue_count > qid)
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if (dev->ctrl.queue_count > qid)
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return 0;
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return 0;
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nvmeq->sqes = qid ? dev->io_sqes : NVME_ADM_SQES;
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nvmeq->q_depth = depth;
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nvmeq->q_depth = depth;
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nvmeq->cqes = dma_alloc_coherent(dev->dev, CQ_SIZE(nvmeq),
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nvmeq->cqes = dma_alloc_coherent(dev->dev, CQ_SIZE(nvmeq),
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&nvmeq->cq_dma_addr, GFP_KERNEL);
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&nvmeq->cq_dma_addr, GFP_KERNEL);
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@ -2317,6 +2321,7 @@ static int nvme_pci_enable(struct nvme_dev *dev)
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dev->ctrl.sqsize = dev->q_depth - 1; /* 0's based queue depth */
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dev->ctrl.sqsize = dev->q_depth - 1; /* 0's based queue depth */
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dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap);
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dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap);
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dev->dbs = dev->bar + 4096;
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dev->dbs = dev->bar + 4096;
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dev->io_sqes = NVME_NVM_IOSQES;
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/*
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/*
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* Temporary fix for the Apple controller found in the MacBook8,1 and
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* Temporary fix for the Apple controller found in the MacBook8,1 and
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@ -140,6 +140,7 @@ enum {
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* Submission and Completion Queue Entry Sizes for the NVM command set.
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* Submission and Completion Queue Entry Sizes for the NVM command set.
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* (In bytes and specified as a power of two (2^n)).
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* (In bytes and specified as a power of two (2^n)).
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*/
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*/
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#define NVME_ADM_SQES 6
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#define NVME_NVM_IOSQES 6
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#define NVME_NVM_IOSQES 6
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#define NVME_NVM_IOCQES 4
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#define NVME_NVM_IOCQES 4
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