From 7cec3a06b11a61835f2fad5d32a67536aea04a7b Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 12 Jul 2021 07:48:06 +0200 Subject: [PATCH] bsg: move bsg_scsi_ops to drivers/scsi/ Move the SCSI-specific bsg code in the SCSI midlayer instead of in the common bsg code. This just keeps the common bsg code block/ and also allows building it as a module. Signed-off-by: Christoph Hellwig --- block/Kconfig | 23 ++-------- block/Makefile | 2 +- block/bsg.c | 95 +--------------------------------------- drivers/scsi/Kconfig | 13 ++++++ drivers/scsi/Makefile | 1 + drivers/scsi/scsi_bsg.c | 95 ++++++++++++++++++++++++++++++++++++++++ drivers/scsi/scsi_priv.h | 10 +++++ include/linux/blkdev.h | 2 +- include/linux/bsg.h | 11 ++--- 9 files changed, 128 insertions(+), 124 deletions(-) create mode 100644 drivers/scsi/scsi_bsg.c diff --git a/block/Kconfig b/block/Kconfig index fd732aede92236..88aa8824179585 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -35,29 +35,12 @@ config BLK_SCSI_REQUEST config BLK_CGROUP_RWSTAT bool -config BLK_DEV_BSG - bool "Block layer SG support v4" - default y - select BLK_SCSI_REQUEST - help - Saying Y here will enable generic SG (SCSI generic) v4 support - for any block device. - - Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 - can handle complicated SCSI commands: tagged variable length cdbs - with bidirectional data transfers and generic request/response - protocols (e.g. Task Management Functions and SMP in Serial - Attached SCSI). - - This option is required by recent UDEV versions to properly - access device serial numbers, etc. - - If unsure, say Y. +config BLK_DEV_BSG_COMMON + tristate config BLK_DEV_BSGLIB bool "Block layer SG support v4 helper lib" - select BLK_DEV_BSG - select BLK_SCSI_REQUEST + select BLK_DEV_BSG_COMMON help Subsystems will normally enable this if needed. Users will not normally need to manually enable this. diff --git a/block/Makefile b/block/Makefile index bfbe4e13ca1ef2..f37d532c8da5dd 100644 --- a/block/Makefile +++ b/block/Makefile @@ -13,7 +13,7 @@ obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-sysfs.o \ obj-$(CONFIG_BOUNCE) += bounce.o obj-$(CONFIG_BLK_SCSI_REQUEST) += scsi_ioctl.o -obj-$(CONFIG_BLK_DEV_BSG) += bsg.o +obj-$(CONFIG_BLK_DEV_BSG_COMMON) += bsg.o obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o obj-$(CONFIG_BLK_CGROUP) += blk-cgroup.o obj-$(CONFIG_BLK_CGROUP_RWSTAT) += blk-cgroup-rwstat.o diff --git a/block/bsg.c b/block/bsg.c index e51459011467f9..6062c0931530f0 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -15,9 +15,6 @@ #include #include -#include -#include -#include #include #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" @@ -54,86 +51,6 @@ static inline struct hlist_head *bsg_dev_idx_hash(int index) #define uptr64(val) ((void __user *)(uintptr_t)(val)) -static int bsg_scsi_check_proto(struct sg_io_v4 *hdr) -{ - if (hdr->protocol != BSG_PROTOCOL_SCSI || - hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD) - return -EINVAL; - return 0; -} - -static int bsg_scsi_fill_hdr(struct request *rq, struct sg_io_v4 *hdr, - fmode_t mode) -{ - struct scsi_request *sreq = scsi_req(rq); - - if (hdr->dout_xfer_len && hdr->din_xfer_len) { - pr_warn_once("BIDI support in bsg has been removed.\n"); - return -EOPNOTSUPP; - } - - sreq->cmd_len = hdr->request_len; - if (sreq->cmd_len > BLK_MAX_CDB) { - sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL); - if (!sreq->cmd) - return -ENOMEM; - } - - if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len)) - return -EFAULT; - if (blk_verify_command(sreq->cmd, mode)) - return -EPERM; - return 0; -} - -static int bsg_scsi_complete_rq(struct request *rq, struct sg_io_v4 *hdr) -{ - struct scsi_request *sreq = scsi_req(rq); - int ret = 0; - - /* - * fill in all the output members - */ - hdr->device_status = sreq->result & 0xff; - hdr->transport_status = host_byte(sreq->result); - hdr->driver_status = 0; - if (scsi_status_is_check_condition(sreq->result)) - hdr->driver_status = DRIVER_SENSE; - hdr->info = 0; - if (hdr->device_status || hdr->transport_status || hdr->driver_status) - hdr->info |= SG_INFO_CHECK; - hdr->response_len = 0; - - if (sreq->sense_len && hdr->response) { - int len = min_t(unsigned int, hdr->max_response_len, - sreq->sense_len); - - if (copy_to_user(uptr64(hdr->response), sreq->sense, len)) - ret = -EFAULT; - else - hdr->response_len = len; - } - - if (rq_data_dir(rq) == READ) - hdr->din_resid = sreq->resid_len; - else - hdr->dout_resid = sreq->resid_len; - - return ret; -} - -static void bsg_scsi_free_rq(struct request *rq) -{ - scsi_req_free_cmd(scsi_req(rq)); -} - -static const struct bsg_ops bsg_scsi_ops = { - .check_proto = bsg_scsi_check_proto, - .fill_hdr = bsg_scsi_fill_hdr, - .complete_rq = bsg_scsi_complete_rq, - .free_rq = bsg_scsi_free_rq, -}; - static int bsg_sg_io(struct request_queue *q, fmode_t mode, void __user *uarg) { struct request *rq; @@ -486,17 +403,7 @@ int bsg_register_queue(struct request_queue *q, struct device *parent, mutex_unlock(&bsg_mutex); return ret; } - -int bsg_scsi_register_queue(struct request_queue *q, struct device *parent) -{ - if (!blk_queue_scsi_passthrough(q)) { - WARN_ONCE(true, "Attempt to register a non-SCSI queue\n"); - return -EINVAL; - } - - return bsg_register_queue(q, parent, dev_name(parent), &bsg_scsi_ops); -} -EXPORT_SYMBOL_GPL(bsg_scsi_register_queue); +EXPORT_SYMBOL_GPL(bsg_register_queue); static struct cdev bsg_cdev; diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 8f44d433e06e0e..86ecab196dfd08 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -20,6 +20,7 @@ config SCSI select SCSI_DMA if HAS_DMA select SG_POOL select BLK_SCSI_REQUEST + select BLK_DEV_BSG_COMMON if BLK_DEV_BSG help If you want to use a SCSI hard disk, SCSI tape drive, SCSI CD-ROM or any other SCSI device under Linux, say Y and make sure that you know @@ -140,6 +141,18 @@ config CHR_DEV_SG If unsure, say N. +config BLK_DEV_BSG + bool "/dev/bsg support (SG v4)" + depends on SCSI + default y + help + Saying Y here will enable generic SG (SCSI generic) v4 support + for any SCSI device. + + This option is required by UDEV to access device serial numbers, etc. + + If unsure, say Y. + config CHR_DEV_SCH tristate "SCSI media changer support" depends on SCSI diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index 1748d1ec133848..240b831b5a1193 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -168,6 +168,7 @@ scsi_mod-$(CONFIG_BLK_DEBUG_FS) += scsi_debugfs.o scsi_mod-y += scsi_trace.o scsi_logging.o scsi_mod-$(CONFIG_PM) += scsi_pm.o scsi_mod-$(CONFIG_SCSI_DH) += scsi_dh.o +scsi_mod-$(CONFIG_BLK_DEV_BSG) += scsi_bsg.o hv_storvsc-y := storvsc_drv.o diff --git a/drivers/scsi/scsi_bsg.c b/drivers/scsi/scsi_bsg.c new file mode 100644 index 00000000000000..ac5be941f5e8b3 --- /dev/null +++ b/drivers/scsi/scsi_bsg.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include "scsi_priv.h" + +#define uptr64(val) ((void __user *)(uintptr_t)(val)) + +static int bsg_scsi_check_proto(struct sg_io_v4 *hdr) +{ + if (hdr->protocol != BSG_PROTOCOL_SCSI || + hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD) + return -EINVAL; + return 0; +} + +static int bsg_scsi_fill_hdr(struct request *rq, struct sg_io_v4 *hdr, + fmode_t mode) +{ + struct scsi_request *sreq = scsi_req(rq); + + if (hdr->dout_xfer_len && hdr->din_xfer_len) { + pr_warn_once("BIDI support in bsg has been removed.\n"); + return -EOPNOTSUPP; + } + + sreq->cmd_len = hdr->request_len; + if (sreq->cmd_len > BLK_MAX_CDB) { + sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL); + if (!sreq->cmd) + return -ENOMEM; + } + + if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len)) + return -EFAULT; + if (blk_verify_command(sreq->cmd, mode)) + return -EPERM; + return 0; +} + +static int bsg_scsi_complete_rq(struct request *rq, struct sg_io_v4 *hdr) +{ + struct scsi_request *sreq = scsi_req(rq); + int ret = 0; + + /* + * fill in all the output members + */ + hdr->device_status = sreq->result & 0xff; + hdr->transport_status = host_byte(sreq->result); + hdr->driver_status = 0; + if (scsi_status_is_check_condition(sreq->result)) + hdr->driver_status = DRIVER_SENSE; + hdr->info = 0; + if (hdr->device_status || hdr->transport_status || hdr->driver_status) + hdr->info |= SG_INFO_CHECK; + hdr->response_len = 0; + + if (sreq->sense_len && hdr->response) { + int len = min_t(unsigned int, hdr->max_response_len, + sreq->sense_len); + + if (copy_to_user(uptr64(hdr->response), sreq->sense, len)) + ret = -EFAULT; + else + hdr->response_len = len; + } + + if (rq_data_dir(rq) == READ) + hdr->din_resid = sreq->resid_len; + else + hdr->dout_resid = sreq->resid_len; + + return ret; +} + +static void bsg_scsi_free_rq(struct request *rq) +{ + scsi_req_free_cmd(scsi_req(rq)); +} + +static const struct bsg_ops bsg_scsi_ops = { + .check_proto = bsg_scsi_check_proto, + .fill_hdr = bsg_scsi_fill_hdr, + .complete_rq = bsg_scsi_complete_rq, + .free_rq = bsg_scsi_free_rq, +}; + +int bsg_scsi_register_queue(struct request_queue *q, struct device *parent) +{ + return bsg_register_queue(q, parent, dev_name(parent), &bsg_scsi_ops); +} diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index 75d6f23e4fffdb..cb3cc7d410375b 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -181,6 +181,16 @@ static inline void scsi_dh_add_device(struct scsi_device *sdev) { } static inline void scsi_dh_release_device(struct scsi_device *sdev) { } #endif +#ifdef CONFIG_BLK_DEV_BSG +int bsg_scsi_register_queue(struct request_queue *q, struct device *parent); +#else +static inline int bsg_scsi_register_queue(struct request_queue *q, + struct device *parent) +{ + return 0; +} +#endif + extern int scsi_device_max_queue_depth(struct scsi_device *sdev); /* diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index c983cd8ecf984d..b525481abfed80 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -537,7 +537,7 @@ struct request_queue { int mq_freeze_depth; -#if defined(CONFIG_BLK_DEV_BSG) +#if defined(CONFIG_BLK_DEV_BSG_COMMON) struct bsg_class_device bsg_dev; #endif diff --git a/include/linux/bsg.h b/include/linux/bsg.h index dac37b6e00ecc8..b887da20bd41b0 100644 --- a/include/linux/bsg.h +++ b/include/linux/bsg.h @@ -5,8 +5,9 @@ #include struct request; +struct request_queue; -#ifdef CONFIG_BLK_DEV_BSG +#ifdef CONFIG_BLK_DEV_BSG_COMMON struct bsg_ops { int (*check_proto)(struct sg_io_v4 *hdr); int (*fill_hdr)(struct request *rq, struct sg_io_v4 *hdr, @@ -24,16 +25,10 @@ struct bsg_class_device { int bsg_register_queue(struct request_queue *q, struct device *parent, const char *name, const struct bsg_ops *ops); -int bsg_scsi_register_queue(struct request_queue *q, struct device *parent); void bsg_unregister_queue(struct request_queue *q); #else -static inline int bsg_scsi_register_queue(struct request_queue *q, - struct device *parent) -{ - return 0; -} static inline void bsg_unregister_queue(struct request_queue *q) { } -#endif /* CONFIG_BLK_DEV_BSG */ +#endif /* CONFIG_BLK_DEV_BSG_COMMON */ #endif /* _LINUX_BSG_H */