From: Yongji Xie <elohimes@gmail.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Li Zhong <zhong@linux.vnet.ibm.com>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
Gavin Shan <gwshan@linux.vnet.ibm.com>,
Alex Williamson <alex.williamson@redhat.com>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH v11 2/7] PCI: A fix for caculating bridge window's size and alignment
Date: Tue, 18 Apr 2017 10:16:40 +0800 [thread overview]
Message-ID: <CAONzpcYdK-aCuNkH7547z2cQt331V1zruNxPmKNs3TCTDAgmQg@mail.gmail.com> (raw)
In-Reply-To: <CAE9FiQW0ds9fXmu77eJscBhYQnQKa9J=+KWThEwC3Kc++YCE-Q@mail.gmail.com>
Hi Yinghai,
On 18 April 2017 at 05:45, Yinghai Lu <yinghai@kernel.org> wrote:
> On Mon, Apr 17, 2017 at 2:36 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
>> From: Yongji Xie <elohimes@gmail.com>
>>
>> In case that one device's alignment is greater than its size,
>> we may get an incorrect size and alignment for its bus's memory
>> window in pbus_size_mem(). This patch fixes this case.
>
> In which case, that device alignment is not same as size?
> or powerpc need small size, but alignment is PAGE_SIZE?
>
Yes, powerpc may have some small size (smaller than PAGE_SIZE)
devices whose alignment would be enforced to be PAGE_SIZE
by pcibios_default_alignment() (in patch 4).
Thanks,
Yongji
next prev parent reply other threads:[~2017-04-18 2:16 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-17 21:36 [PATCH v11 0/7] PCI: Introduce a way to enforce all MMIO BARs not to share PAGE_SIZE Bjorn Helgaas
2017-04-17 21:36 ` [PATCH v11 1/7] PCI: Ignore requested alignment for IOV BARs Bjorn Helgaas
2017-04-17 21:36 ` [PATCH v11 2/7] PCI: A fix for caculating bridge window's size and alignment Bjorn Helgaas
2017-04-17 21:45 ` Yinghai Lu
2017-04-18 2:16 ` Yongji Xie [this message]
2017-04-17 21:36 ` [PATCH v11 3/7] PCI: Add pcibios_default_alignment() for arch-specific alignment control Bjorn Helgaas
2017-04-17 21:36 ` [PATCH v11 4/7] powerpc/powernv: Override pcibios_default_alignment() to force PCI devices to be page aligned Bjorn Helgaas
2017-04-18 5:30 ` Michael Ellerman
2017-04-18 13:53 ` Bjorn Helgaas
2017-04-19 1:47 ` Michael Ellerman
2017-04-19 2:12 ` Yongji Xie
2017-04-19 17:53 ` Bjorn Helgaas
2017-04-17 21:37 ` [PATCH v11 5/7] PCI: Factor pci_reassigndev_resource_alignment() Bjorn Helgaas
2017-04-17 21:37 ` [PATCH v11 6/7] PCI: Don't reassign resources that are already aligned Bjorn Helgaas
2017-04-17 21:37 ` [PATCH v11 7/7] PCI: Don't resize resources when realigning all devices in system Bjorn Helgaas
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