From 0f4f0c8ff1da9171bca0dc01ce5551e8b6d2f0f3 Mon Sep 17 00:00:00 2001 From: Moritz Fischer Date: Mon, 27 Feb 2017 09:19:00 -0600 Subject: fpga: Add flag to indicate bitstream needs decrypting Add a flag that is passed to the write_init() callback, indicating that the bitstream is encrypted. The low-level driver will deal with the flag, or return an error, if encrypted bitstreams are not supported. Signed-off-by: Moritz Fischer Acked-by: Michal Simek Signed-off-by: Alan Tull Signed-off-by: Greg Kroah-Hartman --- include/linux/fpga/fpga-mgr.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h index 57beb5d09bfc..e2ef94fd37af 100644 --- a/include/linux/fpga/fpga-mgr.h +++ b/include/linux/fpga/fpga-mgr.h @@ -70,6 +70,7 @@ enum fpga_mgr_states { */ #define FPGA_MGR_PARTIAL_RECONFIG BIT(0) #define FPGA_MGR_EXTERNAL_CONFIG BIT(1) +#define FPGA_MGR_ENCRYPTED_BITSTREAM BIT(2) /** * struct fpga_image_info - information specific to a FPGA image -- cgit v1.2.3 From 8b1f91fb4c1a8a860b8edc0c383821b2ff8a1ece Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Sat, 4 Mar 2017 18:27:12 -0700 Subject: vmbus: remove useless return's No need for empty return at end of void function Signed-off-by: Stephen Hemminger Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- include/linux/hyperv.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 62bbf3c1aa4a..2b1ed66824be 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1500,8 +1500,6 @@ static inline void hv_signal_on_read(struct vmbus_channel *channel) cached_write_sz = hv_get_cached_bytes_to_write(rbi); if (cached_write_sz < pending_sz) vmbus_setevent(channel); - - return; } static inline void -- cgit v1.2.3 From 2a9d7de2038e87bb2a1085ac73c4246c260263f0 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Sat, 4 Mar 2017 18:27:17 -0700 Subject: vmbus: cleanup header file style Minor changes to align hyper-v vmbus include files with current linux kernel style. Signed-off-by: Stephen Hemminger Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- include/linux/hyperv.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'include/linux') diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 2b1ed66824be..de9b80ff6698 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -524,10 +524,10 @@ struct vmbus_channel_open_channel { u32 target_vp; /* - * The upstream ring buffer begins at offset zero in the memory - * described by RingBufferGpadlHandle. The downstream ring buffer - * follows it at this offset (in pages). - */ + * The upstream ring buffer begins at offset zero in the memory + * described by RingBufferGpadlHandle. The downstream ring buffer + * follows it at this offset (in pages). + */ u32 downstream_ringbuffer_pageoffset; /* User-specific data to be passed along to the server endpoint. */ @@ -1006,7 +1006,7 @@ extern int vmbus_open(struct vmbus_channel *channel, u32 recv_ringbuffersize, void *userdata, u32 userdatalen, - void(*onchannel_callback)(void *context), + void (*onchannel_callback)(void *context), void *context); extern void vmbus_close(struct vmbus_channel *channel); @@ -1421,7 +1421,7 @@ struct hyperv_service_callback { char *log_msg; uuid_le data; struct vmbus_channel *channel; - void (*callback) (void *context); + void (*callback)(void *context); }; #define MAX_SRV_VER 0x7ffffff -- cgit v1.2.3 From 4827ee1dca5691c9fc568883170a568db94f9b38 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Sat, 4 Mar 2017 18:27:18 -0700 Subject: vmbus: expose debug info for drivers Allow driver to get debug information about state of the ring. Signed-off-by: Stephen Hemminger Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- include/linux/hyperv.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'include/linux') diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index de9b80ff6698..1fa727fe5f93 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -491,6 +491,12 @@ struct vmbus_channel_rescind_offer { u32 child_relid; } __packed; +static inline u32 +hv_ringbuffer_pending_size(const struct hv_ring_buffer_info *rbi) +{ + return rbi->ring_buffer->pending_send_sz; +} + /* * Request Offer -- no parameters, SynIC message contains the partition ID * Set Snoop -- no parameters, SynIC message contains the partition ID @@ -1148,6 +1154,17 @@ static inline void *hv_get_drvdata(struct hv_device *dev) return dev_get_drvdata(&dev->device); } +struct hv_ring_buffer_debug_info { + u32 current_interrupt_mask; + u32 current_read_index; + u32 current_write_index; + u32 bytes_avail_toread; + u32 bytes_avail_towrite; +}; + +void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info, + struct hv_ring_buffer_debug_info *debug_info); + /* Vmbus interface */ #define vmbus_driver_register(driver) \ __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME) -- cgit v1.2.3 From b5bc980a4929bb2a449fef3e0b7131466815d0b1 Mon Sep 17 00:00:00 2001 From: Martyn Welch Date: Sat, 4 Mar 2017 00:34:29 +0000 Subject: docs: Add kernel-doc comments to VME driver API Add kernel-doc comments to the VME driver API and structures. This documentation will be integrated into the RST documentation in a later patch. Signed-off-by: Martyn Welch Signed-off-by: Greg Kroah-Hartman --- include/linux/vme.h | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/vme.h b/include/linux/vme.h index ec5e8bf6118e..25874da3f2e1 100644 --- a/include/linux/vme.h +++ b/include/linux/vme.h @@ -92,7 +92,7 @@ extern struct bus_type vme_bus_type; #define VME_SLOT_ALL -2 /** - * Structure representing a VME device + * struct vme_dev - Structure representing a VME device * @num: The device number * @bridge: Pointer to the bridge device this device is on * @dev: Internal device structure @@ -107,6 +107,16 @@ struct vme_dev { struct list_head bridge_list; }; +/** + * struct vme_driver - Structure representing a VME driver + * @name: Driver name, should be unique among VME drivers and usually the same + * as the module name. + * @match: Callback used to determine whether probe should be run. + * @probe: Callback for device binding, called when new device is detected. + * @remove: Callback, called on device removal. + * @driver: Underlying generic device driver structure. + * @devices: List of VME devices (struct vme_dev) associated with this driver. + */ struct vme_driver { const char *name; int (*match)(struct vme_dev *); -- cgit v1.2.3 From 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 Mon Sep 17 00:00:00 2001 From: Logan Gunthorpe Date: Fri, 17 Mar 2017 12:48:08 -0600 Subject: chardev: add helper function to register char devs with a struct device Credit for this patch goes is shared with Dan Williams [1]. I've taken things one step further to make the helper function more useful and clean up calling code. There's a common pattern in the kernel whereby a struct cdev is placed in a structure along side a struct device which manages the life-cycle of both. In the naive approach, the reference counting is broken and the struct device can free everything before the chardev code is entirely released. Many developers have solved this problem by linking the internal kobjs in this fashion: cdev.kobj.parent = &parent_dev.kobj; The cdev code explicitly gets and puts a reference to it's kobj parent. So this seems like it was intended to be used this way. Dmitrty Torokhov first put this in place in 2012 with this commit: 2f0157f char_dev: pin parent kobject and the first instance of the fix was then done in the input subsystem in the following commit: 4a215aa Input: fix use-after-free introduced with dynamic minor changes Subsequently over the years, however, this issue seems to have tripped up multiple developers independently. For example, see these commits: 0d5b7da iio: Prevent race between IIO chardev opening and IIO device (by Lars-Peter Clausen in 2013) ba0ef85 tpm: Fix initialization of the cdev (by Jason Gunthorpe in 2015) 5b28dde [media] media: fix use-after-free in cdev_put() when app exits after driver unbind (by Shauh Khan in 2016) This technique is similarly done in at least 15 places within the kernel and probably should have been done so in another, at least, 5 places. The kobj line also looks very suspect in that one would not expect drivers to have to mess with kobject internals in this way. Even highly experienced kernel developers can be surprised by this code, as seen in [2]. To help alleviate this situation, and hopefully prevent future wasted effort on this problem, this patch introduces a helper function to register a char device along with its parent struct device. This creates a more regular API for tying a char device to its parent without the developer having to set members in the underlying kobject. This patch introduce cdev_device_add and cdev_device_del which replaces a common pattern including setting the kobj parent, calling cdev_add and then calling device_add. It also introduces cdev_set_parent for the few cases that set the kobject parent without using device_add. [1] https://lkml.org/lkml/2017/2/13/700 [2] https://lkml.org/lkml/2017/2/10/370 Signed-off-by: Logan Gunthorpe Signed-off-by: Dan Williams Reviewed-by: Hans Verkuil Reviewed-by: Alexandre Belloni Signed-off-by: Greg Kroah-Hartman --- include/linux/cdev.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/linux') diff --git a/include/linux/cdev.h b/include/linux/cdev.h index f8763615a5f2..408bc09ce497 100644 --- a/include/linux/cdev.h +++ b/include/linux/cdev.h @@ -4,6 +4,7 @@ #include #include #include +#include struct file_operations; struct inode; @@ -26,6 +27,10 @@ void cdev_put(struct cdev *p); int cdev_add(struct cdev *, dev_t, unsigned); +void cdev_set_parent(struct cdev *p, struct kobject *kobj); +int cdev_device_add(struct cdev *cdev, struct device *dev); +void cdev_device_del(struct cdev *cdev, struct device *dev); + void cdev_del(struct cdev *); void cd_forget(struct inode *); -- cgit v1.2.3 From 7b6be8444e0f0dd675b54d059793423d3c9b4c03 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 11 Apr 2017 09:49:49 -0700 Subject: dax: refactor dax-fs into a generic provider of 'struct dax_device' instances We want dax capable drivers to be able to publish a set of dax operations [1]. However, we do not want to further abuse block_devices to advertise these operations. Instead we will attach these operations to a dax device and add a lookup mechanism to go from block device path to a dax device. A dax capable driver like pmem or brd is responsible for registering a dax device, alongside a block device, and then a dax capable filesystem is responsible for retrieving the dax device by path name if it wants to call dax_operations. For now, we refactor the dax pseudo-fs to be a generic facility, rather than an implementation detail, of the device-dax use case. Where a "dax device" is just an inode + dax infrastructure, and "Device DAX" is a mapping service layered on top of that base 'struct dax_device'. "Filesystem DAX" is then a mapping service that layers a filesystem on top of that same base device. Filesystem DAX is associated with a block_device for now, but perhaps directly to a dax device in the future, or for new pmem-only filesystems. [1]: https://lkml.org/lkml/2017/1/19/880 Suggested-by: Christoph Hellwig Signed-off-by: Dan Williams --- include/linux/dax.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/dax.h b/include/linux/dax.h index d8a3dc042e1c..5b62f5d19aea 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -8,6 +8,9 @@ struct iomap_ops; +int dax_read_lock(void); +void dax_read_unlock(int id); + /* * We use lowest available bit in exceptional entry for locking, one bit for * the entry size (PMD) and two more to tell us if the entry is a huge zero -- cgit v1.2.3 From 72058005411ffddcae6c06f7b691d635489132af Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 19 Apr 2017 15:14:31 -0700 Subject: dax: add a facility to lookup a dax device by 'host' device name For the current block_device based filesystem-dax path, we need a way for it to lookup the dax_device associated with a block_device. Add a 'host' property of a dax_device that can be used for this purpose. It is a free form string, but for a dax_device associated with a block device it is the bdev name. This is a stop-gap until filesystems are able to mount on a dax-inode directly. Signed-off-by: Dan Williams --- include/linux/dax.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/dax.h b/include/linux/dax.h index 5b62f5d19aea..9b2d5ba10d7d 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -10,6 +10,7 @@ struct iomap_ops; int dax_read_lock(void); void dax_read_unlock(int id); +struct dax_device *dax_get_by_host(const char *host); /* * We use lowest available bit in exceptional entry for locking, one bit for -- cgit v1.2.3 From 6568b08b77816cda2a95919c7494108d983d5941 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 24 Jan 2017 18:44:18 -0800 Subject: dax: introduce dax_operations Track a set of dax_operations per dax_device that can be set at alloc_dax() time. These operations will be used to stop the abuse of block_device_operations for communicating dax capabilities to filesystems. It will also be used to replace the "pmem api" and move pmem-specific cache maintenance, and other dax-driver-specific filesystem-dax operations, to dax device methods. In particular this allows us to stop abusing __copy_user_nocache(), via memcpy_to_pmem(), with a driver specific replacement. This is a standalone introduction of the operations. Follow on patches convert each dax-driver and teach fs/dax.c to use ->direct_access() from dax_operations instead of block_device_operations. Suggested-by: Christoph Hellwig Signed-off-by: Dan Williams --- include/linux/dax.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/linux') diff --git a/include/linux/dax.h b/include/linux/dax.h index 9b2d5ba10d7d..74ebb92b625a 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -7,6 +7,16 @@ #include struct iomap_ops; +struct dax_device; +struct dax_operations { + /* + * direct_access: translate a device-relative + * logical-page-offset into an absolute physical pfn. Return the + * number of pages available for DAX at that pfn. + */ + long (*direct_access)(struct dax_device *, pgoff_t, long, + void **, pfn_t *); +}; int dax_read_lock(void); void dax_read_unlock(int id); -- cgit v1.2.3 From c1d6e828a35df524df2af277eedd1471d05e4f4c Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 24 Jan 2017 23:02:09 -0800 Subject: pmem: add dax_operations support Setup a dax_device to have the same lifetime as the pmem block device and add a ->direct_access() method that is equivalent to pmem_direct_access(). Once fs/dax.c has been converted to use dax_operations the old pmem_direct_access() will be removed. Signed-off-by: Dan Williams --- include/linux/dax.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux') diff --git a/include/linux/dax.h b/include/linux/dax.h index 74ebb92b625a..39a0312c45c3 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -21,6 +21,12 @@ struct dax_operations { int dax_read_lock(void); void dax_read_unlock(int id); struct dax_device *dax_get_by_host(const char *host); +struct dax_device *alloc_dax(void *private, const char *host, + const struct dax_operations *ops); +void put_dax(struct dax_device *dax_dev); +bool dax_alive(struct dax_device *dax_dev); +void kill_dax(struct dax_device *dax_dev); +void *dax_get_private(struct dax_device *dax_dev); /* * We use lowest available bit in exceptional entry for locking, one bit for -- cgit v1.2.3 From d8f07aee3f2fd959878bf614d4e984900018eb9e Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 26 Jan 2017 23:30:05 -0800 Subject: block: kill bdev_dax_capable() This is leftover dead code that has since been replaced by bdev_dax_supported(). Signed-off-by: Dan Williams --- include/linux/blkdev.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 5a7da607ca04..f72708399b83 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1958,7 +1958,6 @@ extern int bdev_write_page(struct block_device *, sector_t, struct page *, struct writeback_control *); extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); extern int bdev_dax_supported(struct super_block *, int); -extern bool bdev_dax_capable(struct block_device *); #else /* CONFIG_BLOCK */ struct block_device; -- cgit v1.2.3 From b0686260fecaa924d8eff2ace94bee70506bc308 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 26 Jan 2017 20:37:35 -0800 Subject: dax: introduce dax_direct_access() Replace bdev_direct_access() with dax_direct_access() that uses dax_device and dax_operations instead of a block_device and block_device_operations for dax. Once all consumers of the old api have been converted bdev_direct_access() will be deleted. Given that block device partitioning decisions can cause dax page alignment constraints to be violated this also introduces the bdev_dax_pgoff() helper. It handles calculating a logical pgoff relative to the dax_device and also checks for page alignment. Signed-off-by: Dan Williams --- include/linux/blkdev.h | 1 + include/linux/dax.h | 2 ++ 2 files changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f72708399b83..612c497d1461 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1958,6 +1958,7 @@ extern int bdev_write_page(struct block_device *, sector_t, struct page *, struct writeback_control *); extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); extern int bdev_dax_supported(struct super_block *, int); +int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff); #else /* CONFIG_BLOCK */ struct block_device; diff --git a/include/linux/dax.h b/include/linux/dax.h index 39a0312c45c3..7e62e280c11f 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -27,6 +27,8 @@ void put_dax(struct dax_device *dax_dev); bool dax_alive(struct dax_device *dax_dev); void kill_dax(struct dax_device *dax_dev); void *dax_get_private(struct dax_device *dax_dev); +long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, + void **kaddr, pfn_t *pfn); /* * We use lowest available bit in exceptional entry for locking, one bit for -- cgit v1.2.3 From f26c5719b2d7b00de69eb83eb1c1c831759fdc9b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 12 Apr 2017 12:35:44 -0700 Subject: dm: add dax_device and dax_operations support Allocate a dax_device to represent the capacity of a device-mapper instance. Provide a ->direct_access() method via the new dax_operations indirection that mirrors the functionality of the current direct_access support via block_device_operations. Once fs/dax.c has been converted to use dax_operations the old dm_blk_direct_access() will be removed. A new helper dm_dax_get_live_target() is introduced to separate some of the dm-specifics from the direct_access implementation. This enabling is only for the top-level dm representation to upper layers. Converting target direct_access implementations is deferred to a separate patch. Cc: Toshi Kani Reviewed-by: Mike Snitzer Signed-off-by: Dan Williams --- include/linux/device-mapper.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index a7e6903866fd..bcba4d89089c 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -130,6 +130,7 @@ typedef int (*dm_busy_fn) (struct dm_target *ti); */ typedef long (*dm_direct_access_fn) (struct dm_target *ti, sector_t sector, void **kaddr, pfn_t *pfn, long size); +#define PAGE_SECTORS (PAGE_SIZE / 512) void dm_error(const char *message); -- cgit v1.2.3 From 817bf40265459578abc36c6bd53e27775b5c7ec4 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 12 Apr 2017 13:37:44 -0700 Subject: dm: teach dm-targets to use a dax_device + dax_operations Arrange for dm to lookup the dax services available from member devices. Update the dax-capable targets, linear and stripe, to route dax operations to the underlying device. Changes the target-internal ->direct_access() method to more closely align with the dax_operations ->direct_access() calling convention. Cc: Toshi Kani Reviewed-by: Mike Snitzer Signed-off-by: Dan Williams --- include/linux/device-mapper.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'include/linux') diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index bcba4d89089c..df830d167892 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -128,14 +128,15 @@ typedef int (*dm_busy_fn) (struct dm_target *ti); * < 0 : error * >= 0 : the number of bytes accessible at the address */ -typedef long (*dm_direct_access_fn) (struct dm_target *ti, sector_t sector, - void **kaddr, pfn_t *pfn, long size); +typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff, + long nr_pages, void **kaddr, pfn_t *pfn); #define PAGE_SECTORS (PAGE_SIZE / 512) void dm_error(const char *message); struct dm_dev { struct block_device *bdev; + struct dax_device *dax_dev; fmode_t mode; char name[16]; }; @@ -177,7 +178,7 @@ struct target_type { dm_busy_fn busy; dm_iterate_devices_fn iterate_devices; dm_io_hints_fn io_hints; - dm_direct_access_fn direct_access; + dm_dax_direct_access_fn direct_access; /* For internal device-mapper use. */ struct list_head list; -- cgit v1.2.3 From fa5d932c323e8e0d9b24b3517997d15b36d1607d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 27 Jan 2017 12:04:59 -0800 Subject: ext2, ext4, xfs: retrieve dax_device for iomap operations In preparation for converting fs/dax.c to use dax_direct_access() instead of bdev_direct_access(), add the plumbing to retrieve the dax_device associated with a given block_device. Signed-off-by: Dan Williams --- include/linux/iomap.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 7291810067eb..f753e788da31 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -41,6 +41,7 @@ struct iomap { u16 type; /* type of mapping */ u16 flags; /* flags for mapping */ struct block_device *bdev; /* block device for I/O */ + struct dax_device *dax_dev; /* dax_dev for dax operations */ }; /* -- cgit v1.2.3 From a41fe02b6bba853a29c864d00fd161bbe6cfc715 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 27 Jan 2017 14:13:15 -0800 Subject: Revert "block: use DAX for partition table reads" commit d1a5f2b4d8a1 ("block: use DAX for partition table reads") was part of a stalled effort to allow dax mappings of block devices. Since then the device-dax mechanism has filled the role of dax-mapping static device ranges. Now that we are moving ->direct_access() from a block_device operation to a dax_inode operation we would need block devices to map and carry their own dax_inode reference. Unless / until we decide to revive dax mapping of raw block devices through the dax_inode scheme, there is no need to carry read_dax_sector(). Its removal in turn allows for the removal of bdev_direct_access() and should have been included in commit 223757016837 ("block_dev: remove DAX leftovers"). Cc: Jeff Moyer Signed-off-by: Dan Williams --- include/linux/dax.h | 6 ------ 1 file changed, 6 deletions(-) (limited to 'include/linux') diff --git a/include/linux/dax.h b/include/linux/dax.h index 7e62e280c11f..0d0d890f9186 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -70,15 +70,9 @@ void dax_wake_mapping_entry_waiter(struct address_space *mapping, pgoff_t index, void *entry, bool wake_all); #ifdef CONFIG_FS_DAX -struct page *read_dax_sector(struct block_device *bdev, sector_t n); int __dax_zero_page_range(struct block_device *bdev, sector_t sector, unsigned int offset, unsigned int length); #else -static inline struct page *read_dax_sector(struct block_device *bdev, - sector_t n) -{ - return ERR_PTR(-ENXIO); -} static inline int __dax_zero_page_range(struct block_device *bdev, sector_t sector, unsigned int offset, unsigned int length) { -- cgit v1.2.3 From cccbce67158290537cc671cbd4c1564876485a65 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 27 Jan 2017 13:31:42 -0800 Subject: filesystem-dax: convert to dax_direct_access() Now that a dax_device is plumbed through all dax-capable drivers we can switch from block_device_operations to dax_operations for invoking ->direct_access. This also lets us kill off some usages of struct blk_dax_ctl on the way to its eventual removal. Suggested-by: Christoph Hellwig Signed-off-by: Dan Williams --- include/linux/dax.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/dax.h b/include/linux/dax.h index 0d0d890f9186..d3158e74a59e 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -70,11 +70,13 @@ void dax_wake_mapping_entry_waiter(struct address_space *mapping, pgoff_t index, void *entry, bool wake_all); #ifdef CONFIG_FS_DAX -int __dax_zero_page_range(struct block_device *bdev, sector_t sector, +int __dax_zero_page_range(struct block_device *bdev, + struct dax_device *dax_dev, sector_t sector, unsigned int offset, unsigned int length); #else static inline int __dax_zero_page_range(struct block_device *bdev, - sector_t sector, unsigned int offset, unsigned int length) + struct dax_device *dax_dev, sector_t sector, + unsigned int offset, unsigned int length) { return -ENXIO; } -- cgit v1.2.3 From d4b29fd78ea6fc2be219be3af1a992149b4ff0f6 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 27 Jan 2017 17:22:03 -0800 Subject: block: remove block_device_operations ->direct_access() Now that all the producers and consumers of dax interfaces have been converted to using dax_operations on a dax_device, remove the block device direct_access enabling. Signed-off-by: Dan Williams --- include/linux/blkdev.h | 17 ----------------- 1 file changed, 17 deletions(-) (limited to 'include/linux') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 612c497d1461..848f87eb1905 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1916,28 +1916,12 @@ static inline bool integrity_req_gap_front_merge(struct request *req, #endif /* CONFIG_BLK_DEV_INTEGRITY */ -/** - * struct blk_dax_ctl - control and output parameters for ->direct_access - * @sector: (input) offset relative to a block_device - * @addr: (output) kernel virtual address for @sector populated by driver - * @pfn: (output) page frame number for @addr populated by driver - * @size: (input) number of bytes requested - */ -struct blk_dax_ctl { - sector_t sector; - void *addr; - long size; - pfn_t pfn; -}; - struct block_device_operations { int (*open) (struct block_device *, fmode_t); void (*release) (struct gendisk *, fmode_t); int (*rw_page)(struct block_device *, sector_t, struct page *, bool); int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); - long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *, - long); unsigned int (*check_events) (struct gendisk *disk, unsigned int clearing); /* ->media_changed() is DEPRECATED, use ->check_events() instead */ @@ -1956,7 +1940,6 @@ extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, extern int bdev_read_page(struct block_device *, sector_t, struct page *); extern int bdev_write_page(struct block_device *, sector_t, struct page *, struct writeback_control *); -extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); extern int bdev_dax_supported(struct super_block *, int); int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff); #else /* CONFIG_BLOCK */ -- cgit v1.2.3 From 6abccd1bfee49e491095772fd5aa9e96d915ae52 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 13 Jan 2017 14:14:23 -0800 Subject: x86, dax, pmem: remove indirection around memcpy_from_pmem() memcpy_from_pmem() maps directly to memcpy_mcsafe(). The wrapper serves no real benefit aside from affording a more generic function name than the x86-specific 'mcsafe'. However this would not be the first time that x86 terminology leaked into the global namespace. For lack of better name, just use memcpy_mcsafe() directly. This conversion also catches a place where we should have been using plain memcpy, acpi_nfit_blk_single_io(). Cc: Cc: Jan Kara Cc: Jeff Moyer Cc: Ingo Molnar Cc: Christoph Hellwig Cc: "H. Peter Anvin" Cc: Thomas Gleixner Cc: Matthew Wilcox Cc: Ross Zwisler Acked-by: Tony Luck Signed-off-by: Dan Williams --- include/linux/pmem.h | 23 ----------------------- include/linux/string.h | 8 ++++++++ 2 files changed, 8 insertions(+), 23 deletions(-) (limited to 'include/linux') diff --git a/include/linux/pmem.h b/include/linux/pmem.h index e856c2cb0fe8..71ecf3d46aac 100644 --- a/include/linux/pmem.h +++ b/include/linux/pmem.h @@ -31,12 +31,6 @@ static inline void arch_memcpy_to_pmem(void *dst, const void *src, size_t n) BUG(); } -static inline int arch_memcpy_from_pmem(void *dst, const void *src, size_t n) -{ - BUG(); - return -EFAULT; -} - static inline size_t arch_copy_from_iter_pmem(void *addr, size_t bytes, struct iov_iter *i) { @@ -65,23 +59,6 @@ static inline bool arch_has_pmem_api(void) return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API); } -/* - * memcpy_from_pmem - read from persistent memory with error handling - * @dst: destination buffer - * @src: source buffer - * @size: transfer length - * - * Returns 0 on success negative error code on failure. - */ -static inline int memcpy_from_pmem(void *dst, void const *src, size_t size) -{ - if (arch_has_pmem_api()) - return arch_memcpy_from_pmem(dst, src, size); - else - memcpy(dst, src, size); - return 0; -} - /** * memcpy_to_pmem - copy data to persistent memory * @dst: destination buffer for the copy diff --git a/include/linux/string.h b/include/linux/string.h index 26b6f6a66f83..9d6f189157e2 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -114,6 +114,14 @@ extern int memcmp(const void *,const void *,__kernel_size_t); #ifndef __HAVE_ARCH_MEMCHR extern void * memchr(const void *,int,__kernel_size_t); #endif +#ifndef __HAVE_ARCH_MEMCPY_MCSAFE +static inline __must_check int memcpy_mcsafe(void *dst, const void *src, + size_t cnt) +{ + memcpy(dst, src, cnt); + return 0; +} +#endif void *memchr_inv(const void *s, int c, size_t n); char *strreplace(char *s, char old, char new); -- cgit v1.2.3