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nvme: add a common helper to read Identify Controller data

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And add the 64-bit register read operation for it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2015-11-28 15:37:52 +01:00 committed by Jens Axboe
parent 5fd4ce1b00
commit 7fd8930f26
3 changed files with 71 additions and 38 deletions
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52
drivers/nvme/host/core.c
View File

@ -776,6 +776,58 @@ int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
return ret;
}
/*
* Initialize the cached copies of the Identify data and various controller
* register in our nvme_ctrl structure. This should be called as soon as
* the admin queue is fully up and running.
*/
int nvme_init_identify(struct nvme_ctrl *ctrl)
{
struct nvme_id_ctrl *id;
u64 cap;
int ret, page_shift;
ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
if (ret) {
dev_err(ctrl->dev, "Reading CAP failed (%d)\n", ret);
return ret;
}
page_shift = NVME_CAP_MPSMIN(cap) + 12;
ret = nvme_identify_ctrl(ctrl, &id);
if (ret) {
dev_err(ctrl->dev, "Identify Controller failed (%d)\n", ret);
return -EIO;
}
ctrl->oncs = le16_to_cpup(&id->oncs);
ctrl->abort_limit = id->acl + 1;
ctrl->vwc = id->vwc;
memcpy(ctrl->serial, id->sn, sizeof(id->sn));
memcpy(ctrl->model, id->mn, sizeof(id->mn));
memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
if (id->mdts)
ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9);
else
ctrl->max_hw_sectors = UINT_MAX;
if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
unsigned int max_hw_sectors;
ctrl->stripe_size = 1 << (id->vs[3] + page_shift);
max_hw_sectors = ctrl->stripe_size >> (page_shift - 9);
if (ctrl->max_hw_sectors) {
ctrl->max_hw_sectors = min(max_hw_sectors,
ctrl->max_hw_sectors);
} else {
ctrl->max_hw_sectors = max_hw_sectors;
}
}
kfree(id);
return 0;
}
static void nvme_free_ctrl(struct kref *kref)
{
struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);

4
drivers/nvme/host/nvme.h
View File

@ -62,6 +62,8 @@ struct nvme_ctrl {
u32 ctrl_config;
u32 page_size;
u32 max_hw_sectors;
u32 stripe_size;
u16 oncs;
u16 abort_limit;
u8 event_limit;
@ -93,6 +95,7 @@ struct nvme_ns {
struct nvme_ctrl_ops {
int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
void (*free_ctrl)(struct nvme_ctrl *ctrl);
};
@ -177,6 +180,7 @@ int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
void nvme_put_ctrl(struct nvme_ctrl *ctrl);
int nvme_init_identify(struct nvme_ctrl *ctrl);
void nvme_put_ns(struct nvme_ns *ns);
struct request *nvme_alloc_request(struct request_queue *q,

53
drivers/nvme/host/pci.c
View File

@ -129,8 +129,6 @@ struct nvme_dev {
struct work_struct probe_work;
struct work_struct scan_work;
bool subsystem;
u32 max_hw_sectors;
u32 stripe_size;
void __iomem *cmb;
dma_addr_t cmb_dma_addr;
u64 cmb_size;
@ -1592,13 +1590,13 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid)
list_add_tail(&ns->list, &dev->namespaces);
blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
if (dev->max_hw_sectors) {
blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors);
if (dev->ctrl.max_hw_sectors) {
blk_queue_max_hw_sectors(ns->queue, dev->ctrl.max_hw_sectors);
blk_queue_max_segments(ns->queue,
(dev->max_hw_sectors / (dev->ctrl.page_size >> 9)) + 1);
(dev->ctrl.max_hw_sectors / (dev->ctrl.page_size >> 9)) + 1);
}
if (dev->stripe_size)
blk_queue_chunk_sectors(ns->queue, dev->stripe_size >> 9);
if (dev->ctrl.stripe_size)
blk_queue_chunk_sectors(ns->queue, dev->ctrl.stripe_size >> 9);
if (dev->ctrl.vwc & NVME_CTRL_VWC_PRESENT)
blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA);
blk_queue_virt_boundary(ns->queue, dev->ctrl.page_size - 1);
@ -1933,38 +1931,10 @@ static void nvme_dev_scan(struct work_struct *work)
static int nvme_dev_add(struct nvme_dev *dev)
{
int res;
struct nvme_id_ctrl *ctrl;
int shift = NVME_CAP_MPSMIN(lo_hi_readq(dev->bar + NVME_REG_CAP)) + 12;
res = nvme_identify_ctrl(&dev->ctrl, &ctrl);
if (res) {
dev_err(dev->dev, "Identify Controller failed (%d)\n", res);
return -EIO;
}
dev->ctrl.oncs = le16_to_cpup(&ctrl->oncs);
dev->ctrl.abort_limit = ctrl->acl + 1;
dev->ctrl.vwc = ctrl->vwc;
memcpy(dev->ctrl.serial, ctrl->sn, sizeof(ctrl->sn));
memcpy(dev->ctrl.model, ctrl->mn, sizeof(ctrl->mn));
memcpy(dev->ctrl.firmware_rev, ctrl->fr, sizeof(ctrl->fr));
if (ctrl->mdts)
dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9);
else
dev->max_hw_sectors = UINT_MAX;
if ((dev->ctrl.quirks & NVME_QUIRK_STRIPE_SIZE) && ctrl->vs[3]) {
unsigned int max_hw_sectors;
dev->stripe_size = 1 << (ctrl->vs[3] + shift);
max_hw_sectors = dev->stripe_size >> (shift - 9);
if (dev->max_hw_sectors) {
dev->max_hw_sectors = min(max_hw_sectors,
dev->max_hw_sectors);
} else
dev->max_hw_sectors = max_hw_sectors;
}
kfree(ctrl);
res = nvme_init_identify(&dev->ctrl);
if (res)
return res;
if (!dev->tagset.tags) {
dev->tagset.ops = &nvme_mq_ops;
@ -2597,9 +2567,16 @@ static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
return 0;
}
static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
{
*val = readq(to_nvme_dev(ctrl)->bar + off);
return 0;
}
static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
.reg_read32 = nvme_pci_reg_read32,
.reg_write32 = nvme_pci_reg_write32,
.reg_read64 = nvme_pci_reg_read64,
.free_ctrl = nvme_pci_free_ctrl,
};