lkml.org 
[lkml]   [2015]   [Sep]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [PATCH V7 1/3] genalloc:support memory-allocation with bytes-alignment to genalloc
Date
On Wed, 2015-09-02 at 08:38AM +0800, Wood Scott-B07421 wrote:
> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Wednesday, September 02, 2015 8:30 AM
> To: Zhao Qiang-B45475
> Cc: linux-kernel@vger.kernel.org; linuxppc-dev@lists.ozlabs.org;
> lauraa@codeaurora.org; Xie Xiaobo-R63061; benh@kernel.crashing.org; Li
> Yang-Leo-R58472; paulus@samba.org
> Subject: Re: [PATCH V7 1/3] genalloc:support memory-allocation with
> bytes-alignment to genalloc
>
> On Mon, 2015-08-31 at 16:58 +0800, Zhao Qiang wrote:
> > Bytes alignment is required to manage some special RAM, so add
> > gen_pool_first_fit_align to genalloc, meanwhile add
> > gen_pool_alloc_data to pass data to gen_pool_first_fit_align(modify
> > gen_pool_alloc as a wrapper)
> >
> > Signed-off-by: Zhao Qiang <qiang.zhao@freescale.com>
> > ---
> > Changes for v6:
> > - patches set v6 include a new patch because of using
> > - genalloc to manage QE MURAM, patch 0001 is the new
> > - patch, adding bytes alignment for allocation for use.
> > Changes for v7:
> > - cpm muram also need to use genalloc to manage, it has
> > a function to reserve a specific region of muram,
> > add offset to genpool_data for start addr to be allocated.
>
> This seems to be describing more than just the changes in this patch.
> What does also handling cpm have to do with this patch? Are you adding
> support for reserving a specific region in this patch? I don't see it,
> and in any case it should go in a different patch.

Yes, I added. The code below can support the function.
offset_bit = (alignment->offset + (1UL << order) - 1) >> order;
return bitmap_find_next_zero_area(map, size, start + offset_bit, nr,
align_mask);
CPM has an function cpm_muram_alloc_fixed, needing to allocate muram from a
Specific offset. So I add the code and add offset to struct data.
This patch is the first patch of this patch set, so I explain what changes about
Set v7 and why I add support for reserving a specific region in this patch.

If you really think a different patch needed, I can add a new patch to handle it.

>
> > +/*
> > + * gen_pool data descriptor for gen_pool_first_fit_align.
> > + */
> > +struct genpool_data_align {
> > + int align; /* alignment by bytes for starting
> address */
> > + unsigned long offset; /* the offset of allocation start addr*/
> > +};
>
> The offset belongs on the caller side, not here.

So, how do I pass offset to gen_pool_alloc_data or pool->algo?

>
> -Scott

\
 
 \ /
  Last update: 2015-09-02 04:21    [W:0.297 / U:0.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site