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path: root/drivers/ieee1394/hosts.h
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* ieee1394: shrink tlabel pools, remove tpool semaphoresStefan Richter2006-09-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch reduces the size of struct hpsb_host and also removes semaphores from ieee1394_transactions.c. On i386, struct hpsb_host shrinks from 10656 bytes to 6688 bytes. This is accomplished by - using a single wait_queue for hpsb_get_tlabel instead of many instances of semaphores, - using a single lock to serialize access to all tlabel pools (the protected code regions are small, i.e. lock contention very low), - omitting the sysfs attribute tlabels_allocations. Drawback: In the rare case that a process needs to sleep because all transaction labels for the node are temporarily exhausted, it is also woken up if a tlabel for a different node became free, checks for an available tlabel, and is put to sleep again. The check is not costly and the situation occurs extremely rarely. (Tlabels are typically only exhausted if there was no context switch to the khpsbpkt thread which recycles tlables.) Therefore the benefit of reduced tpool size outweighs this drawback. The sysfs attributes tlabels_free and tlabels_mask are not compiled anymore unless CONFIG_IEEE1394_VERBOSEDEBUG is set. The by far biggest member of struct hpsb_host, the struct csr_control csr (5272 bytes on i386), is now placed at the end of struct hpsb_host. Note, hpsb_get_tlabel calls the macro wait_event_interruptible with a condition argument which has a side effect (allocation of a tlabel and manipulation of the packet). This side effect happens only if the condition is true. The patch relies on wait_event_interruptible not evaluating the condition again after it became true. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
* [PATCH] ieee1394: clean up declarations of hpsb_*_config_romStefan Richter2006-07-03
| | | | | | | | hpsb_update_config_rom() is defined in csr.c, not hosts.c. hpsb_get_config_rom() does not exist. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
* [PATCH] ieee1394: update #include directives in midlayer header filesStefan Richter2006-07-03
| | | | | | | | Remove unnecessary includes, add missing includes. Use forward type declarations for some structs. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
* [PATCH] ieee1394: coding style and comment fixes in midlayer header filesStefan Richter2006-07-03
| | | | | | | | | Adjust tabulators, line wraps, empty lines, and comment style. Update comments in ieee1394_transactions.h and highlevel.h. Fix typo in comment in csr.h. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
* ieee1394: extend lowlevel API for address range propertiesBen Collins2006-06-12
| | | | | | | | | | | | | Host adapter hardware imposes certain restrictions and features on address ranges. Instead of hard-wire such ranges into the ieee1394 core or even into protocol drivers, let lowlevel drivers specify these ranges via struct hpsb_host. Patch "ohci1394: set address range properties" must be applied too, else hpsb_allocate_and_register_addrspace() won't work properly. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
* ieee1394: save RAM by using a single tlabel for broadcast transactionsBen Collins2006-06-12
| | | | | | | | | | Since broadcast transactions are already complete when the request has been sent, the same transaction label can be reused all over again, see IEEE 1394 7.3.2.5 and 6.2.4.3. Therefore we can reduce the footprint of struct hpsb_host by the size of one struct hpsb_tlabel_pool. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
* ieee1394: support for slow links or slow 1394b phy portsBen Collins2006-06-12
| | | | | | | | | | | | | | | | | | | | | | | | Add support for the following types of hardware: + nodes that have a link speed < PHY speed + 1394b PHYs that are less than S800 capable + 1394b/1394a adapter cable between two 1394b PHYs Also, S1600 and S3200 are now supported if IEEE1394_SPEED_MAX is raised. A probing function is added to nodemgr's config ROM fetching routine which adjusts the allowable speed if an access problem was encountered. Pros and Cons of the approach: + minimum code footprint to support this less widely used hardware + nearly no overhead for unaffected hardware - ineffective before nodemgr began to read the ROM of affected nodes - ineffective if ieee1394 is loaded with disable_nodemgr=1 The speed map CSRs which are published to the bus are not touched by the patch. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: Hakan Ardo <hakan@debian.org> Cc: Calculex <linux@calculex.com> Cc: Robert J. Kosinski <robk@cmcherald.com> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
* ieee1394: whitespace cleanup in hosts.[ch], ieee1394_core.[ch]Stefan Richter2005-12-01
| | | | | Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
* ieee1394: resume remote ports when starting a host (fixes device recognition)Stefan Richter2005-12-01
| | | | | | | | | | | | After initializing an IEEE 1394 host, broadcast a resume packet. This makes remote nodes visible which suspended their ports while the host was down. Such nodes had to be unplugged and replugged in order to be recognized. Motorola DCT6200 cable reciever was affected, probably other devices too. http://marc.theaimsgroup.com/?t=113202715800001 Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
* [PATCH] ieee1394: trivial edits of a few commentsJody McIntyre2005-09-30
| | | | | | | | | | trivial edits of a few comments Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Ben Collins <bcollins@debian.org> Signed-off-by: Jody McIntyre <scjody@steamballoon.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Linux-2.6.12-rc2v2.6.12-rc2Linus Torvalds2005-04-16
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!