linux-kernel - Re: [PATCH v3 28/51] PCI: Unifiy calculate

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Message-ID: <CAE9FiQVXxuGR_QMwB-irnCR04NSRAw0AWSOszvsHAnnsc_iDEw@mail.gmail.com>
Date:	Tue, 18 Aug 2015 23:37:38 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>, TJ <linux@....tj>,
	Yijing Wang <wangyijing@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 28/51] PCI: Unifiy calculate_size for io port and mmio

On Mon, Aug 17, 2015 at 9:13 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Mon, Jul 27, 2015 at 04:29:46PM -0700, Yinghai Lu wrote:
>> We should check size+size1 with min_size for io port.
>> For example, when hotplug bridge has two children bridges,
>> every child bridge will need 0x1000, so size1 will be 0x2000
>> and size is 0. The min_size for the hotplug bridge is 0x100.
>
> A min_size of 0x100?  Is that a typo?

yes, it is 0x100.

#define DEFAULT_HOTPLUG_IO_SIZE         (256)
/* pci=hpmemsize=nnM,hpiosize=nn can override this */
unsigned long pci_hotplug_io_size  = DEFAULT_HOTPLUG_IO_SIZE;

and we have

                if (bus->self->is_hotplug_bridge) {
                        min_io_size  = pci_hotplug_io_size;

>
>> with old version calculate_iosize, we get 0x3000 for final
>> size because we are using size to compare with min_size. That is
>> not right, we should use 0x2000 instead.
>
> If this fixes a bug, please make one patch that *only* fixes the bug,
> and a separate one that unifies but doesn't change the behavior.

ok, will separate it into two.
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