nvme: move chardev and sysfs interface to common code
For this we need to add a proper controller init routine and a list of
all controllers that is in addition to the list of PCIe controllers,
which stays in pci.c. Note that we remove the sysfs device when the
last reference to a controller is dropped now - the old code would have
kept it around longer, which doesn't make much sense.
This requires a new ->reset_ctrl operation to implement controleller
resets, and a new ->write_reg32 operation that is required to implement
subsystem resets. We also now store caches copied of the NVMe compliance
version and the flag if a controller is attached to a subsystem or not in
the generic controller structure now.
Signed-off-by: Christoph Hellwig <hch@lst.de>
[Fixes for pr merge]
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index dfedaaa..93378be 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -19,8 +19,6 @@
#include <linux/kref.h>
#include <linux/blk-mq.h>
-struct nvme_passthru_cmd;
-
extern unsigned char nvme_io_timeout;
#define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
@@ -56,6 +54,7 @@
struct blk_mq_tag_set *tagset;
struct list_head namespaces;
struct device *device; /* char device */
+ struct list_head node;
char name[12];
char serial[20];
@@ -71,6 +70,8 @@
u16 abort_limit;
u8 event_limit;
u8 vwc;
+ u32 vs;
+ bool subsystem;
unsigned long quirks;
};
@@ -100,6 +101,7 @@
int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
bool (*io_incapable)(struct nvme_ctrl *ctrl);
+ int (*reset_ctrl)(struct nvme_ctrl *ctrl);
void (*free_ctrl)(struct nvme_ctrl *ctrl);
};
@@ -123,6 +125,13 @@
return val & NVME_CSTS_CFS;
}
+static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
+{
+ if (!ctrl->subsystem)
+ return -ENOTTY;
+ return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
+}
+
static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
{
return (sector >> (ns->lba_shift - 9));
@@ -194,6 +203,8 @@
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);
+int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
+ const struct nvme_ctrl_ops *ops, unsigned long quirks);
void nvme_put_ctrl(struct nvme_ctrl *ctrl);
int nvme_init_identify(struct nvme_ctrl *ctrl);
@@ -224,9 +235,6 @@
extern spinlock_t dev_list_lock;
-int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
- struct nvme_passthru_cmd __user *ucmd);
-
struct sg_io_hdr;
int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
