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SubjectRe: One problem in reassign pci bus number?
On Thu, May 03, 2012 at 01:33:17AM -0700, Yinghai Lu wrote:
>On Wed, May 2, 2012 at 11:54 PM, Richard Yang
><weiyang@linux.vnet.ibm.com> wrote:
>> On Wed, Apr 25, 2012 at 09:28:19AM -0700, Yinghai Lu wrote:
>>>On Wed, Apr 25, 2012 at 2:47 AM, Wei Yang <weiyang.kernel@gmail.com> wrote:
>>>>> busn_alloc patchset should address your concern.
>>>>>
>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
>>>>> for-pci-busn-alloc
>>
>> For some functions, such as probe_resource() would you mind add some
>> comments?  Such as explain the parameter usage.
>> That would help for reading the function.
>
>I updated for-pci-busn-alloc branch with updating of probe_resource()...
>and removing bus->secondary and subordinate.
>
You mean you remove the bus->secondary field?
So the pci_bus->number hold the bus number?
I think this is a huge work.
>Please check if you can understand it ...
>
>http://git.kernel.org/?p=linux/kernel/git/yinghai/linux-yinghai.git;a=commitdiff;h=7de8df57b223d54af95ffe67f8da2dd39a265971
Some question:

+static resource_size_t __find_res_top_free_size(struct resource *res,
+ int skip_nr)
+{
+ resource_size_t n_size;
+ struct resource tmp_res;
+
+ */
+ * find out free number below res->end that we can use.
+ * res->start to res->start + skip_nr - 1 can not be used.
+ */
+ n_size = resource_size(res);
+ if (n_size <= skip_nr)
+ return 0;
+
+ n_size -= skip_nr;
+ memset(&tmp_res, 0, sizeof(struct resource));
+ while (n_size > 0) {
+ int ret;
+
+ ret = __allocate_resource(res, &tmp_res, n_size,
+ res->end - n_size + skip_nr, res->end,
+ 1, NULL, NULL, false);
+ if (ret == 0) {
+ __release_resource(&tmp_res);
+ break;
+ }
+ n_size--;
+ }
+
+ return n_size;
+}
So this is trying to find out the biggest free space of res?
On the right side?
For example we have , res like
90-150
105-140
The __find_res_top_free_size() will return 10 instead of 15.
So this is the design decision to find the right side free resouce not
the left side?

>
>Thanks
>
>Yinghai

--
Richard Yang
Help you, Help me

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