History log of /haiku/src/system/kernel/device_manager/dma_resources.h
Revision Date Author Comments
# 435c43f5 02-Jun-2010 Ingo Weinhold <ingo_weinhold@gmx.de>

* Introduced type generic_io_vec, which is similar to iovec, but uses types
that are wide enough for both virtual and physical addresses.
* DMABuffer, IORequest, IOScheduler,... and code using them: Use
generic_io_vec and generic_{addr,size}_t where necessary.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36997 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 0316483f 27-Aug-2008 Ingo Weinhold <ingo_weinhold@gmx.de>

* DMAResource::TranslateNext(): Added parameter to limit the maximum
operation length.
* IORequest: Added owner (IORequestOwner). Also added a SetUnfinished()
method, which is invoked by the I/O scheduler after all operations of
the request have been finished, but the request isn't done yet.
* Added debugger commands "io_request_owner" and "io_scheduler" printing
information for a IORequestOwner and IOScheduler object respectively.
* Implemented an actual I/O scheduling algorithm. It's a simple round
robin strategy (a queue per thread) with a unidirectional elevator
serializing the operations. ATM priorities are ignored, the bandwidth
isn't adjusted to the device, and there are TODOs all over the place.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27216 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 025f7c32 24-Aug-2008 Ingo Weinhold <ingo_weinhold@gmx.de>

A DMABuffer doesn't have a fixed bounce buffer assigned anymore. We do
dynamically assign one when needed. Under the assumption that in most
cases a bounce buffer isn't needed, we can thus prepare a lot more
operations.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27185 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 61b1a536 14-Aug-2008 Axel Dörfler <axeld@pinc-software.de>

* Fixed the mix of bufferCount vs. max_segment_count with regards to
B_BLOCK_DEVICE_MAX_SG_BLOCKS as pointed out by Ingo.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26972 a95241bf-73f2-0310-859d-f6bbb57e9c96


# f8a59924 06-Aug-2008 Axel Dörfler <axeld@pinc-software.de>

* Added Dump() method to IORequest, IOOperation, IOBuffer, and DMABuffer.
* Added KDL commands "io_request", "io_operation", "io_buffer", and
"dma_buffer".


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26838 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 39b5c374 05-Aug-2008 Axel Dörfler <axeld@pinc-software.de>

* Added a DMAResource::Init() method that gets a device node - for now, it will
reuse the block_io attributes in the node to build the dma_restrictions.
* DMAResource::Init() now dumps the dma_resources (should be done with the
TRACE() macro later).
* Turned off IOScheduler debug output.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26825 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 8faff60c 21-Jul-2008 Axel Dörfler <axeld@pinc-software.de>

* Enabled all DMA tests, wrote some more.
* Moved data buffer creation to a TestSuiteContext class.
* Added checks if the I/O operation does the correct thing, ie. reads/writes
the data to the right offset.
* Rearranged DMA translation: we now handle the partial write case correctly
(bounce buffer must always span over the whole block), and are able to join
adjacent bounce buffers together.
* The new _AddBounceBuffer() method also respects boundary and segment size
restrictions for bounce buffers.
* IOOperation now prepares the outgoing vecs/offset/length to contain the
right data for the current phase (partial read begin/end/do-all); it will
also make sure that the lengths of the vecs are of the same size than the
whole request.
* All tests are now passed, the I/O request implementation seems to be ready
for integration now.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26556 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 45a206a7 19-Jul-2008 Axel Dörfler <axeld@pinc-software.de>

axeld + bonefish:
More work on the I/O scheduler, more precisely mainly the DMAResource class:
* When splitting requests into operations, we're now able to flexibly mix
bounce buffer segments and the given physical vectors in a single
operation. This reduces the number of operations.
* Squashed several TODO and fleshed out more of the implementation.
* Added a test driver running unit tests. There are only a few tests yet,
but those pass.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26519 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 6969690a 18-Jul-2008 Axel Dörfler <axeld@pinc-software.de>

bonefish + axeld:
* Moved the old I/O scheduler code into the device manager, and replaced its
contents completely :-)
* Implemented the DMA and I/O requests/scheduler framework - for now in C++
only. It's a work in progress and not used anywhere yet.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26488 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 435c43f5912b109e7d5cf682865d2061e62fad8c 02-Jun-2010 Ingo Weinhold <ingo_weinhold@gmx.de>

* Introduced type generic_io_vec, which is similar to iovec, but uses types
that are wide enough for both virtual and physical addresses.
* DMABuffer, IORequest, IOScheduler,... and code using them: Use
generic_io_vec and generic_{addr,size}_t where necessary.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36997 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 0316483f0ade2904583955b57cc396bf060f9027 27-Aug-2008 Ingo Weinhold <ingo_weinhold@gmx.de>

* DMAResource::TranslateNext(): Added parameter to limit the maximum
operation length.
* IORequest: Added owner (IORequestOwner). Also added a SetUnfinished()
method, which is invoked by the I/O scheduler after all operations of
the request have been finished, but the request isn't done yet.
* Added debugger commands "io_request_owner" and "io_scheduler" printing
information for a IORequestOwner and IOScheduler object respectively.
* Implemented an actual I/O scheduling algorithm. It's a simple round
robin strategy (a queue per thread) with a unidirectional elevator
serializing the operations. ATM priorities are ignored, the bandwidth
isn't adjusted to the device, and there are TODOs all over the place.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27216 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 025f7c3289220e25bc02d546d9f3acbcf605ae50 24-Aug-2008 Ingo Weinhold <ingo_weinhold@gmx.de>

A DMABuffer doesn't have a fixed bounce buffer assigned anymore. We do
dynamically assign one when needed. Under the assumption that in most
cases a bounce buffer isn't needed, we can thus prepare a lot more
operations.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27185 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 61b1a536e8e346af6559e8353786091b85629a9d 14-Aug-2008 Axel Dörfler <axeld@pinc-software.de>

* Fixed the mix of bufferCount vs. max_segment_count with regards to
B_BLOCK_DEVICE_MAX_SG_BLOCKS as pointed out by Ingo.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26972 a95241bf-73f2-0310-859d-f6bbb57e9c96


# f8a59924e5a8afacf7c966c00156cf55b151cf9a 06-Aug-2008 Axel Dörfler <axeld@pinc-software.de>

* Added Dump() method to IORequest, IOOperation, IOBuffer, and DMABuffer.
* Added KDL commands "io_request", "io_operation", "io_buffer", and
"dma_buffer".


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26838 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 39b5c374187b8c7d7a13e8159a70eadb0f06ecb0 05-Aug-2008 Axel Dörfler <axeld@pinc-software.de>

* Added a DMAResource::Init() method that gets a device node - for now, it will
reuse the block_io attributes in the node to build the dma_restrictions.
* DMAResource::Init() now dumps the dma_resources (should be done with the
TRACE() macro later).
* Turned off IOScheduler debug output.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26825 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 8faff60c7fe72c4dc62b3e823faac1fe244e43d5 21-Jul-2008 Axel Dörfler <axeld@pinc-software.de>

* Enabled all DMA tests, wrote some more.
* Moved data buffer creation to a TestSuiteContext class.
* Added checks if the I/O operation does the correct thing, ie. reads/writes
the data to the right offset.
* Rearranged DMA translation: we now handle the partial write case correctly
(bounce buffer must always span over the whole block), and are able to join
adjacent bounce buffers together.
* The new _AddBounceBuffer() method also respects boundary and segment size
restrictions for bounce buffers.
* IOOperation now prepares the outgoing vecs/offset/length to contain the
right data for the current phase (partial read begin/end/do-all); it will
also make sure that the lengths of the vecs are of the same size than the
whole request.
* All tests are now passed, the I/O request implementation seems to be ready
for integration now.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26556 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 45a206a7420034118693e3bbc8976083e1045e51 19-Jul-2008 Axel Dörfler <axeld@pinc-software.de>

axeld + bonefish:
More work on the I/O scheduler, more precisely mainly the DMAResource class:
* When splitting requests into operations, we're now able to flexibly mix
bounce buffer segments and the given physical vectors in a single
operation. This reduces the number of operations.
* Squashed several TODO and fleshed out more of the implementation.
* Added a test driver running unit tests. There are only a few tests yet,
but those pass.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26519 a95241bf-73f2-0310-859d-f6bbb57e9c96


# 6969690afee7ab446c14e04011cf5cadedb09c1b 18-Jul-2008 Axel Dörfler <axeld@pinc-software.de>

bonefish + axeld:
* Moved the old I/O scheduler code into the device manager, and replaced its
contents completely :-)
* Implemented the DMA and I/O requests/scheduler framework - for now in C++
only. It's a work in progress and not used anywhere yet.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26488 a95241bf-73f2-0310-859d-f6bbb57e9c96