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path: root/drivers/dma/ioatdma.c (follow)
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2007-10-16I/OAT: Rename the source fileShannon Nelson1-818/+0
Rename the ioatdma.c file in preparation for splitting into multiple files, which will allow for easier adding new functionality. Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16I/OAT: New device idsShannon Nelson1-2/+3
Add device ids for new revs of the Intel I/OAT DMA engine Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-26[IOAT]: ioatdma needs to to play nice in a multi-dma-client worldShannon Nelson1-14/+4
Now that the DMA engine has a multi-client interface, fix the ioatdma driver to play along. At the same time, remove a couple of unnecessary reads and writes. Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-08-14[IOAT]: Remove redundant struct member to avoid descriptor cache missShannon Nelson1-4/+3
The layout for struct ioat_desc_sw is non-optimal and causes an extra cache hit for every descriptor processed. By tightening up the struct layout and removing one item, we pull in the fields that get used in the speedpath and get a little better performance. Before: ------- struct ioat_desc_sw { struct ioat_dma_descriptor * hw; /* 0 8 */ struct list_head node; /* 8 16 */ int tx_cnt; /* 24 4 */ /* XXX 4 bytes hole, try to pack */ dma_addr_t src; /* 32 8 */ __u32 src_len; /* 40 4 */ /* XXX 4 bytes hole, try to pack */ dma_addr_t dst; /* 48 8 */ __u32 dst_len; /* 56 4 */ /* XXX 4 bytes hole, try to pack */ /* --- cacheline 1 boundary (64 bytes) --- */ struct dma_async_tx_descriptor async_tx; /* 64 144 */ /* --- cacheline 3 boundary (192 bytes) was 16 bytes ago --- */ /* size: 208, cachelines: 4 */ /* sum members: 196, holes: 3, sum holes: 12 */ /* last cacheline: 16 bytes */ }; /* definitions: 1 */ After: ------ struct ioat_desc_sw { struct ioat_dma_descriptor * hw; /* 0 8 */ struct list_head node; /* 8 16 */ int tx_cnt; /* 24 4 */ __u32 len; /* 28 4 */ dma_addr_t src; /* 32 8 */ dma_addr_t dst; /* 40 8 */ struct dma_async_tx_descriptor async_tx; /* 48 144 */ /* --- cacheline 3 boundary (192 bytes) --- */ /* size: 192, cachelines: 3 */ }; /* definitions: 1 */ Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-13ioatdma: add the unisys "i/oat" pci vendor/device idDan Williams1-0/+2
Cc: John Magolan <john.magolan@unisys.com> Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2007-07-13dmaengine: make clients responsible for managing channelsDan Williams1-1/+0
The current implementation assumes that a channel will only be used by one client at a time. In order to enable channel sharing the dmaengine core is changed to a model where clients subscribe to channel-available-events. Instead of tracking how many channels a client wants and how many it has received the core just broadcasts the available channels and lets the clients optionally take a reference. The core learns about the clients' needs at dma_event_callback time. In support of multiple operation types, clients can specify a capability mask to only be notified of channels that satisfy a certain set of capabilities. Changelog: * removed DMA_TX_ARRAY_INIT, no longer needed * dma_client_chan_free -> dma_chan_release: switch to global reference counting only at device unregistration time, before it was also happening at client unregistration time * clients now return dma_state_client to dmaengine (ack, dup, nak) * checkpatch.pl fixes * fixup merge with git-ioat Cc: Chris Leech <christopher.leech@intel.com> Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: David S. Miller <davem@davemloft.net>
2007-07-13dmaengine: refactor dmaengine around dma_async_tx_descriptorDan Williams1-158/+137
The current dmaengine interface defines mutliple routines per operation, i.e. dma_async_memcpy_buf_to_buf, dma_async_memcpy_buf_to_page etc. Adding more operation types (xor, crc, etc) to this model would result in an unmanageable number of method permutations. Are we really going to add a set of hooks for each DMA engine whizbang feature? - Jeff Garzik The descriptor creation process is refactored using the new common dma_async_tx_descriptor structure. Instead of per driver do_<operation>_<dest>_to_<src> methods, drivers integrate dma_async_tx_descriptor into their private software descriptor and then define a 'prep' routine per operation. The prep routine allocates a descriptor and ensures that the tx_set_src, tx_set_dest, tx_submit routines are valid. Descriptor creation and submission becomes: struct dma_device *dev; struct dma_chan *chan; struct dma_async_tx_descriptor *tx; tx = dev->device_prep_dma_<operation>(chan, len, int_flag) tx->tx_set_src(dma_addr_t, tx, index /* for multi-source ops */) tx->tx_set_dest(dma_addr_t, tx, index) tx->tx_submit(tx) In addition to the refactoring, dma_async_tx_descriptor also lays the groundwork for definining cross-channel-operation dependencies, and a callback facility for asynchronous notification of operation completion. Changelog: * drop dma mapping methods, suggested by Chris Leech * fix ioat_dma_dependency_added, also caught by Andrew Morton * fix dma_sync_wait, change from Andrew Morton * uninline large functions, change from Andrew Morton * add tx->callback = NULL to dmaengine calls to interoperate with async_tx calls * hookup ioat_tx_submit * convert channel capabilities to a 'cpumask_t like' bitmap * removed DMA_TX_ARRAY_INIT, no longer needed * checkpatch.pl fixes * make set_src, set_dest, and tx_submit descriptor specific methods * fixup git-ioat merge * move group_list and phys to dma_async_tx_descriptor Cc: Jeff Garzik <jeff@garzik.org> Cc: Chris Leech <christopher.leech@intel.com> Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: David S. Miller <davem@davemloft.net>
2007-07-11I/OAT: fix I/OAT for kexecDan Aloni1-0/+13
Under kexec, I/OAT initialization breaks over busy resources because the previous kernel did not release them. I'm not sure this fix can be considered a complete one but it works for me. I guess something similar to the *_remove method should occur there.. Signed-off-by: Dan Aloni <da-x@monatomic.org> Signed-off-by: Chris Leech <christopher.leech@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2007-07-11ioatdma: Remove the use of writeq from the ioatdma driverChris Leech1-6/+4
There's only one now anyway, and it's not in a performance path, so make it behave the same on 32-bit and 64-bit CPUs. Signed-off-by: Chris Leech <christopher.leech@intel.com>
2007-07-11ioatdma: Remove the wrappers around read(bwl)/write(bwl) in ioatdmaChris Leech1-32/+28
Signed-off-by: Chris Leech <christopher.leech@intel.com>
2007-07-11ioatdma: Push pending transactions to hardware more frequentlyChris Leech1-2/+2
Every 20 descriptors turns out to be to few append commands with newer/faster CPUs. Pushing every 4 still cuts down on MMIO writes to an acceptable level without letting the DMA engine run out of work. Signed-off-by: Chris Leech <christopher.leech@intel.com>
2007-06-28IOATDMA: fix section mismatchesRandy Dunlap1-4/+4
Rename struct pci_driver data so that false section mismatch warnings won't be produced. Sam, ISTM that depending on variable names is the weakest & worst part of modpost section checking. Should __init_refok work here? I got build errors when I tried to use it, probably because the struct pci_driver probe and remove methods are not marked "__init_refok". WARNING: drivers/dma/ioatdma.o(.data+0x10): Section mismatch: reference to .init.text: (between 'ioat_pci_drv' and 'ioat_pci_tbl') WARNING: drivers/dma/ioatdma.o(.data+0x14): Section mismatch: reference to .exit.text: (between 'ioat_pci_drv' and 'ioat_pci_tbl') Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: Chris Leech <christopher.leech@intel.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2006-12-07[PATCH] slab: remove SLAB_KERNELChristoph Lameter1-2/+2
SLAB_KERNEL is an alias of GFP_KERNEL. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-10[PATCH] drivers/dma trivial annotationsAl Viro1-2/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-05IRQ: Maintain regs pointer globally rather than passing to IRQ handlersDavid Howells1-1/+1
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-07-21[I/OAT]: Remove pci_module_init() from Intel I/OAT DMA engineHenrik Kretzschmar1-1/+1
Changes pci_module_init() to pci_register_driver(). Signed-off-by: Henrik Kretzschmar <henne@nachtwindheim.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-07-03[IOAT]: fix kernel-doc in source filesRandy Dunlap1-3/+5
Fix kernel-doc warnings in drivers/dma/: - use correct function & parameter names - add descriptions where omitted Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-07-03[IOAT]: Fix a warning in ioatdmaBenoit Boissinot1-1/+1
drivers/dma/ioatdma.c: In function 'ioat_init_module': drivers/dma/ioatdma.c:830: warning: control reaches end of non-void function Signed-off-by: Benoit Boissinot <benoit.boissinot@ens-lyon.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-07-02[PATCH] irq-flags: misc drivers: Use the new IRQF_ constantsThomas Gleixner1-1/+1
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26[IOAT]: Do not dereference THIS_MODULE directly to set unsafe.David S. Miller1-3/+2
Use the __unsafe() macro instead. Noticed by Miles Lane. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-17[I/OAT]: ioatdma.c needs linux/dma-mapping.hDavid S. Miller1-0/+1
For DMA_*_MASK defines. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-17[I/OAT]: Driver for the Intel(R) I/OAT DMA engineChris Leech1-0/+839
Adds a new ioatdma driver Signed-off-by: Chris Leech <christopher.leech@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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