- 06 Jan, 2009 40 commits
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FUJITA Tomonori authored
This converts X86 and IA64 to use include/linux/dma-mapping.h. It's a bit large but pretty boring. The major change for X86 is converting 'int dir' to 'enum dma_data_direction dir' in DMA mapping operations. The major changes for IA64 is using map_page and unmap_page instead of map_single and unmap_single. Signed-off-by:
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by:
Tony Luck <tony.luck@intel.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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FUJITA Tomonori authored
This adds struct dma_map_ops include/linux/dma-mapping.h, which, is used to handle multiple sets of dma mapping API. Signed-off-by:
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FUJITA Tomonori authored
This patch converts dma_map_single and dma_unmap_single to use map_page and unmap_page respectively and removes unnecessary map_single and unmap_single in struct dma_mapping_ops. This leaves intel-iommu's dma_map_single and dma_unmap_single since IA64 uses them. They will be removed after the unification. Signed-off-by:
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FUJITA Tomonori authored
This is a preparation of struct dma_mapping_ops unification. We use map_page and unmap_page instead of map_single and unmap_single. We will remove map_single hook in the last patch in this patchset. Signed-off-by:
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FUJITA Tomonori authored
This is a preparation of struct dma_mapping_ops unification. We use map_page and unmap_page instead of map_single and unmap_single. This uses a temporary workaround, ifdef X86_64 to avoid IA64 build. The workaround will be removed after the unification. Well, changing x86's struct dma_mapping_ops could break IA64. It's just wrong. It's one of problems that this patchset fixes. We will remove map_single and unmap_single hooks in the last patch in this patchset. Signed-off-by:
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FUJITA Tomonori authored
This is a preparation of struct dma_mapping_ops unification. We use map_page and unmap_page instead of map_single and unmap_single. We will remove map_single and unmap_single hooks in the last patch in this patchset. Signed-off-by:
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FUJITA Tomonori authored
This is a preparation of struct dma_mapping_ops unification. We use map_page and unmap_page instead of map_single and unmap_single. We will remove map_single and unmap_single hooks in the last patch in this patchset. Signed-off-by:
Muli Ben-Yehuda <muli@il.ibm.com> Signed-off-by:
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FUJITA Tomonori authored
This is a preparation of struct dma_mapping_ops unification. We use map_page and unmap_page instead of map_single and unmap_single. We will remove map_single and unmap_single hooks in the last patch in this patchset. Signed-off-by:
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FUJITA Tomonori authored
This is a preparation of struct dma_mapping_ops unification. We use map_page and unmap_page instead of map_single and unmap_single. This is sorta temporary workaround. We will move them to lib/swiotlb.c to enable x86's swiotlb code to directly use them. We will remove map_single and unmap_single hooks in the last patch in this patchset. Signed-off-by:
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FUJITA Tomonori authored
This patch adds map_page and unmap_page to struct dma_mapping_ops. This is a preparation of struct dma_mapping_ops unification. We use map_page and unmap_page instead of map_single and unmap_single. We will remove map_single and unmap_single hooks in the last patch in this patchset. Signed-off-by:
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FUJITA Tomonori authored
Now we don't need to export these DMA mapping functions. Signed-off-by:
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FUJITA Tomonori authored
This removes remove hwsw_dma_ops (and hwsw_* functions). hwsw_dma_get_ops can select swiotlb_dma_ops and sba_dma_ops appropriately. Signed-off-by:
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FUJITA Tomonori authored
This adds dma_get_ops hook to struct ia64_machine_vector. We use dma_get_ops() in arch/ia64/kernel/dma-mapping.c, which simply returns the global dma_ops. This is for removing hwsw_dma_ops. Signed-off-by:
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FUJITA Tomonori authored
Now we don't need to export sn DMA mapping functions. Signed-off-by:
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FUJITA Tomonori authored
We don't need dma operation hooks in struct ia64_machine_vector now. This also removes unused ia64_mv_dma_* typedefs. Signed-off-by:
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FUJITA Tomonori authored
This writes asm/dma-mapping.h to convert the DMA API to use dma_ops. Signed-off-by:
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FUJITA Tomonori authored
This patch introduces a global pointer, dma_ops, which points to an appropriate dma_mapping_ops that the kernel should use. This is a common way to handle multiple dma_mapping_ops (X86, POWER, and SPARC). dma_ops is set in platform_dma_init. We also set it by hand where machvec_init is callev via subsys_initcall. - IA64_DIG_VTD uses vtd_dma_ops. - IA64_HP_ZX1 uses sba_dma_ops. - IA64_HP_ZX1_SWIOTLB uses hwsw_dma_ops. - IA64_SGI_SN2 uses sn_dma_ops. - The rest use swiotlb_dma_ops. Signed-off-by:
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FUJITA Tomonori authored
There is already dma_mapping_ops for SWIOTLB but there are some missing hooks. This is for IA64_DIG_VTD, IA64_HP_ZX1_SWIOTLB, IA64_SGI_UV, IA64_HP_SIM, IA64_XEN_GUEST and IA64_GENERIC. Signed-off-by:
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FUJITA Tomonori authored
This is for IA64_SGI_SN2. Signed-off-by:
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FUJITA Tomonori authored
This is for IA64_DIG_VTD. Signed-off-by:
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FUJITA Tomonori authored
This is for IA64_HP_ZX1_SWIOTLB. Signed-off-by:
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FUJITA Tomonori authored
This is for IA64_HP_ZX1. Signed-off-by:
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FUJITA Tomonori authored
This adds map/unmap_single_attr and map/unmap_sg_attr to struct dma_mapping_ops. This enables us to move the dma operations in struct ia64_machine_vector to struct dma_mapping_ops. Note that we will remove map/unmap_sg and map/umap_single. This is a preparation of struct dma_mapping_ops unification. Signed-off-by:
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Ingo Molnar authored
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git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dmLinus Torvalds authored
* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: dm snapshot: extend exception store functions dm snapshot: split out exception store implementations dm snapshot: rename struct exception_store dm snapshot: separate out exception store interface dm mpath: move trigger_event to system workqueue dm: add name and uuid to sysfs dm table: rework reference counting dm: support barriers on simple devices dm request: extend target interface dm request: add caches dm ioctl: allow dm_copy_name_and_uuid to return only one field dm log: ensure log bitmap fits on log device dm log: move region_size validation dm log: avoid reinitialising io_req on every operation dm: consolidate target deregistration error handling dm raid1: fix error count dm log: fix dm_io_client leak on error paths dm snapshot: change yield to msleep dm table: drop reference at unbind
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Jonathan Brassow authored
Supply dm_add_exception as a callback to the read_metadata function. Add a status function ready for a later patch and name the functions consistently. Signed-off-by:
Jonathan Brassow <jbrassow@redhat.com> Signed-off-by:
Alasdair G Kergon <agk@redhat.com>
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Alasdair G Kergon authored
Move the existing snapshot exception store implementations out into separate files. Later patches will place these behind a new interface in preparation for alternative implementations. Signed-off-by: -
Jonathan Brassow authored
Rename struct exception_store to dm_exception_store. Signed-off-by:
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Jonathan Brassow authored
Pull structures that bridge the gap between snapshot and exception store out of dm-snap.h and put them in a new .h file - dm-exception-store.h. This file will define the API for new exception stores. Ultimately, dm-snap.h is unnecessary, since only dm-snap.c should be using it. Signed-off-by:
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Alasdair G Kergon authored
The same workqueue is used both for sending uevents and processing queued I/O. Deadlock has been reported in RHEL5 when sending a uevent was blocked waiting for the queued I/O to be processed. Use scheduled_work() for the asynchronous uevents instead. Signed-off-by: -
Milan Broz authored
Implement simple read-only sysfs entry for device-mapper block device. This patch adds a simple sysfs directory named "dm" under block device properties and implements - name attribute (string containing mapped device name) - uuid attribute (string containing UUID, or empty string if not set) The kobject is embedded in mapped_device struct, so no additional memory allocation is needed for initializing sysfs entry. During the processing of sysfs attribute we need to lock mapped device which is done by a new function dm_get_from_kobj, which returns the md associated with kobject and increases the usage count. Each 'show attribute' function is responsible for its own locking. Signed-off-by:
Milan Broz <mbroz@redhat.com> Signed-off-by:
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Mikulas Patocka authored
Rework table reference counting. The existing code uses a reference counter. When the last reference is dropped and the counter reaches zero, the table destructor is called. Table reference counters are acquired/released from upcalls from other kernel code (dm_any_congested, dm_merge_bvec, dm_unplug_all). If the reference counter reaches zero in one of the upcalls, the table destructor is called from almost random kernel code. This leads to various problems: * dm_any_congested being called under a spinlock, which calls the destructor, which calls some sleeping function. * the destructor attempting to take a lock that is already taken by the same process. * stale reference from some other kernel code keeps the table constructed, which keeps some devices open, even after successful return from "dmsetup remove". This can confuse lvm and prevent closing of underlying devices or reusing device minor numbers. The patch changes reference counting so that the table destructor can be called only at predetermined places. The table has always exactly one reference from either mapped_device->map or hash_cell->new_map. After this patch, this reference is not counted in table->holders. A pair of dm_create_table/dm_destroy_table functions is used for table creation/destruction. Temporary references from the other code increase table->holders. A pair of dm_table_get/dm_table_put functions is used to manipulate it. When the table is about to be destroyed, we wait for table->holders to reach 0. Then, we call the table destructor. We use active waiting with msleep(1), because the situation happens rarely (to one user in 5 years) and removing the device isn't performance-critical task: the user doesn't care if it takes one tick more or not. This way, the destructor is called only at specific points (dm_table_destroy function) and the above problems associated with lazy destruction can't happen. Finally remove the temporary protection added to dm_any_congested(). Signed-off-by:
Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:
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Andi Kleen authored
Implement barrier support for single device DM devices This patch implements barrier support in DM for the common case of dm linear just remapping a single underlying device. In this case we can safely pass the barrier through because there can be no reordering between devices. NB. Any DM device might cease to support barriers if it gets reconfigured so code must continue to allow for a possible -EOPNOTSUPP on every barrier bio submitted. - agk Signed-off-by:Andi Kleen <ak@suse.de> Signed-off-by:
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Kiyoshi Ueda authored
This patch adds the following target interfaces for request-based dm. map_rq : for mapping a request rq_end_io : for finishing a request busy : for avoiding performance regression from bio-based dm. Target can tell dm core not to map requests now, and that may help requests in the block layer queue to be bigger by I/O merging. In bio-based dm, this behavior is done by device drivers managing the block layer queue. But in request-based dm, dm core has to do that since dm core manages the block layer queue. Signed-off-by:Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by:
Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by:
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Kiyoshi Ueda authored
This patch prepares some kmem_caches for request-based dm. Signed-off-by:
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Milan Broz authored
Allow NULL buffer in dm_copy_name_and_uuid if you only want to return one of the fields. (Required by a following patch that adds these fields to sysfs.) Signed-off-by:
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Milan Broz authored
Check that the log bitmap will fit within the log device. Signed-off-by:
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Milan Broz authored
Move log size validation from mirror target to log constructor. Removed PAGE_SIZE restriction we no longer think necessary. Signed-off-by:
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Takahiro Yasui authored
rw_header function updates three members of io_req data every time when I/O is processed. bi_rw and notify.fn are never modified once they get initialized, and so they can be set in advance. header_to_disk() can also be pulled out of write_header() since only one caller needs it and write_header() can be replaced by rw_header() directly. Signed-off-by:
Takahiro Yasui <tyasui@redhat.com> Signed-off-by:
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Mikulas Patocka authored
Change dm_unregister_target to return void and use BUG() for error reporting. dm_unregister_target can only fail because of programming bug in the target driver. It can't fail because of user's behavior or disk errors. This patch changes unregister_target to return void and use BUG if someone tries to unregister non-registered target or unregister target that is in use. This patch removes code duplication (testing of error codes in all dm targets) and reports bugs in just one place, in dm_unregister_target. In some target drivers, these return codes were ignored, which could lead to a situation where bugs could be missed. Signed-off-by:
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