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* [PATCH 2.6.21 0/8] ehca: remove use of do_mmap() from kernel space and minor cleanup
@ 2007-01-11 17:07 Hoang-Nam Nguyen
  2007-01-11 18:22 ` Hoang-Nam Nguyen
  0 siblings, 1 reply; 2+ messages in thread
From: Hoang-Nam Nguyen @ 2007-01-11 17:07 UTC (permalink / raw)
  To: Roland Dreier, hch, linux-kernel, linuxppc-dev, openfabrics-ewg,
	openib-general
  Cc: raisch

Hello Roland and Christoph H.!
Here is a set of patches for ehca, whose main purpose is to remove unproper use of
do_mmap() in ehca kernel space as suggested by Christoph H. Other "small" changes
are:
* Remove "dead" prototype declarations (those without code implementation)
* Use SLAB_ defines instead GFP_ ones when allocating memory from slab cache

Actually I should separate those patches for more clarity. Unfortunately that
code cleanup above has been incorporated much earlier in our repository, and
I had not paid attention on when I started to rework the mmap() stuff. Sorry
for this inconvenience!

Now more detail on mmap() rework:
- For eHCA hardware register block we use remap_pfn_range() as previously.
- For queue pages we call pattern vm_insert_page() to register each allocated
kernel page.
- For each mmap-ed resource (hardware register block, send/recv and completion
queue) we introduce a use counter that is incremented and decremented by
the call-backs open()/close(). Destroying a completion queue or queue pair
will succeed only if all associated counters are zero. That means those resources
must be mmap-ed resp. munmap-ed properly by user space.

Thanks
Nam

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH 2.6.21 0/8] ehca: remove use of do_mmap() from kernel space and minor cleanup
  2007-01-11 17:07 [PATCH 2.6.21 0/8] ehca: remove use of do_mmap() from kernel space and minor cleanup Hoang-Nam Nguyen
@ 2007-01-11 18:22 ` Hoang-Nam Nguyen
  0 siblings, 0 replies; 2+ messages in thread
From: Hoang-Nam Nguyen @ 2007-01-11 18:22 UTC (permalink / raw)
  To: Roland Dreier
  Cc: hch, linux-kernel, linuxppc-dev, openfabrics-ewg, openib-general, raisch

Please ignore this. Pushed the send button to fast again.
Regards
Nam

On Thursday 11 January 2007 18:07, Hoang-Nam Nguyen wrote:
> Hello Roland and Christoph H.!
> Here is a set of patches for ehca, whose main purpose is to remove unproper use of
> do_mmap() in ehca kernel space as suggested by Christoph H. Other "small" changes
> are:
> * Remove "dead" prototype declarations (those without code implementation)
> * Use SLAB_ defines instead GFP_ ones when allocating memory from slab cache
> 
> Actually I should separate those patches for more clarity. Unfortunately that
> code cleanup above has been incorporated much earlier in our repository, and
> I had not paid attention on when I started to rework the mmap() stuff. Sorry
> for this inconvenience!
> 
> Now more detail on mmap() rework:
> - For eHCA hardware register block we use remap_pfn_range() as previously.
> - For queue pages we call pattern vm_insert_page() to register each allocated
> kernel page.
> - For each mmap-ed resource (hardware register block, send/recv and completion
> queue) we introduce a use counter that is incremented and decremented by
> the call-backs open()/close(). Destroying a completion queue or queue pair
> will succeed only if all associated counters are zero. That means those resources
> must be mmap-ed resp. munmap-ed properly by user space.
> 
> Thanks
> Nam
> 

^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2007-01-11 18:26 UTC | newest]

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2007-01-11 17:07 [PATCH 2.6.21 0/8] ehca: remove use of do_mmap() from kernel space and minor cleanup Hoang-Nam Nguyen
2007-01-11 18:22 ` Hoang-Nam Nguyen

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