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authorHannes Reinecke <hare@suse.de>2016-10-18 08:40:34 +0200
committerJens Axboe <axboe@fb.com>2016-10-19 03:49:11 +0200
commit89d9475610771b5e5fe1879075f0fc9ba6e3755f (patch)
tree249b9ee1a63ba8ea3bf865f2890efbce6948f1de /drivers/scsi/sd.h
parentblk-zoned: implement ioctls (diff)
downloadlinux-89d9475610771b5e5fe1879075f0fc9ba6e3755f.tar.xz
linux-89d9475610771b5e5fe1879075f0fc9ba6e3755f.zip
sd: Implement support for ZBC devices
Implement ZBC support functions to setup zoned disks, both host-managed and host-aware models. Only zoned disks that satisfy the following conditions are supported: 1) All zones are the same size, with the exception of an eventual last smaller runt zone. 2) For host-managed disks, reads are unrestricted (reads are not failed due to zone or write pointer alignement constraints). Zoned disks that do not satisfy these 2 conditions are setup with a capacity of 0 to prevent their use. The function sd_zbc_read_zones, called from sd_revalidate_disk, checks that the device satisfies the above two constraints. This function may also change the disk capacity previously set by sd_read_capacity for devices reporting only the capacity of conventional zones at the beginning of the LBA range (i.e. devices reporting rc_basis set to 0). The capacity message output was moved out of sd_read_capacity into a new function sd_print_capacity to include this eventual capacity change by sd_zbc_read_zones. This new function also includes a call to sd_zbc_print_zones to display the number of zones and zone size of the device. Signed-off-by: Hannes Reinecke <hare@suse.de> [Damien: * Removed zone cache support * Removed mapping of discard to reset write pointer command * Modified sd_zbc_read_zones to include checks that the device satisfies the kernel constraints * Implemeted REPORT ZONES setup and post-processing based on code from Shaun Tancheff <shaun.tancheff@seagate.com> * Removed confusing use of 512B sector units in functions interface] Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com> Tested-by: Shaun Tancheff <shaun.tancheff@seagate.com> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/scsi/sd.h')
-rw-r--r--drivers/scsi/sd.h70
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index c8d986368da9..4dac35e96a75 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -64,6 +64,15 @@ struct scsi_disk {
struct scsi_device *device;
struct device dev;
struct gendisk *disk;
+#ifdef CONFIG_BLK_DEV_ZONED
+ unsigned int nr_zones;
+ unsigned int zone_blocks;
+ unsigned int zone_shift;
+ unsigned long *zones_wlock;
+ unsigned int zones_optimal_open;
+ unsigned int zones_optimal_nonseq;
+ unsigned int zones_max_open;
+#endif
atomic_t openers;
sector_t capacity; /* size in logical blocks */
u32 max_xfer_blocks;
@@ -94,6 +103,9 @@ struct scsi_disk {
unsigned lbpvpd : 1;
unsigned ws10 : 1;
unsigned ws16 : 1;
+ unsigned rc_basis: 2;
+ unsigned zoned: 2;
+ unsigned urswrz : 1;
};
#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
@@ -156,6 +168,11 @@ static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t b
return blocks * sdev->sector_size;
}
+static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
+{
+ return sector >> (ilog2(sdev->sector_size) - 9);
+}
+
/*
* Look up the DIX operation based on whether the command is read or
* write and whether dix and dif are enabled.
@@ -239,4 +256,57 @@ static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
#endif /* CONFIG_BLK_DEV_INTEGRITY */
+static inline int sd_is_zoned(struct scsi_disk *sdkp)
+{
+ return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
+}
+
+#ifdef CONFIG_BLK_DEV_ZONED
+
+extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
+extern void sd_zbc_remove(struct scsi_disk *sdkp);
+extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
+extern int sd_zbc_setup_write_cmnd(struct scsi_cmnd *cmd);
+extern void sd_zbc_cancel_write_cmnd(struct scsi_cmnd *cmd);
+extern int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd);
+extern int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd);
+extern void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
+ struct scsi_sense_hdr *sshdr);
+
+#else /* CONFIG_BLK_DEV_ZONED */
+
+static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
+ unsigned char *buf)
+{
+ return 0;
+}
+
+static inline void sd_zbc_remove(struct scsi_disk *sdkp) {}
+
+static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
+
+static inline int sd_zbc_setup_write_cmnd(struct scsi_cmnd *cmd)
+{
+ /* Let the drive fail requests */
+ return BLKPREP_OK;
+}
+
+static inline void sd_zbc_cancel_write_cmnd(struct scsi_cmnd *cmd) {}
+
+static inline int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
+{
+ return BLKPREP_INVALID;
+}
+
+static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
+{
+ return BLKPREP_INVALID;
+}
+
+static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
+ unsigned int good_bytes,
+ struct scsi_sense_hdr *sshdr) {}
+
+#endif /* CONFIG_BLK_DEV_ZONED */
+
#endif /* _SCSI_DISK_H */