From: Wei Yang <weiyang@linux•vnet.ibm.com>
To: Alexey Kardashevskiy <aik@ozlabs•ru>
Cc: Gavin Shan <gwshan@linux•vnet.ibm.com>,
Wei Yang <weiyang@linux•vnet.ibm.com>,
benh@kernel•crashing.org, linuxppc-dev@ozlabs•org
Subject: Re: [PATCH V2 2/6] powerpc/powernv: simplify the calculation of iov resource
Date: Thu, 6 Aug 2015 17:41:02 +0800 [thread overview]
Message-ID: <20150806094102.GB13055@richard> (raw)
In-Reply-To: <55C32210.9090803@ozlabs.ru>
On Thu, Aug 06, 2015 at 07:00:00PM +1000, Alexey Kardashevskiy wrote:
>On 08/06/2015 02:51 PM, Gavin Shan wrote:
>>On Wed, Aug 05, 2015 at 09:24:59AM +0800, Wei Yang wrote:
>>>The alignment of IOV BAR on PowerNV platform is the total size of the IOV
>>>BAR. No matter whether the IOV BAR is truncated or not, the total size
>>>could be calculated by (vfs_expanded * VF size).
>>>
>>
>>s/VF size/VF BAR size
>>
>>I think the changelog would be more explicit:
>>
>>The alignment of IOV BAR on PowerNV platform is the total size of the
>>IOV BAR, no matter whether the IOV BAR is extended with number of max
>>VFs or number of max PE number (256). The alignment can be calculated
>>by (vfs_expaned * VF_BAR_size).
>
>
>
>Is that really a PowerNV-specific requirement or it is valid for
>every platform (I suspect this is the case here)?
>
Currently, it is PowerNV-specific.
>
>Also, what is the exact meaning of "expanded" in @vfs_expanded? It is
>either 255 (if individual VF BARs are <= 64MB) or
>roundup_pow_of_two(total_vfs) (which is something like 4 or 16). What
>is expanded here?
>
PF's IOV BAR original size is (VF BAR size * total_vfs).
After expanding, the IOV BAR size is (VF BAR size * 256) or (VF BAR size *
roundup_pow_of_two(total_vfs)).
>
>>
>>>This patch simplifies the pnv_pci_iov_resource_alignment() by removing the
>>>first case.
>>>
>>>Signed-off-by: Wei Yang <weiyang@linux•vnet.ibm.com>
>>
>>Reviewed-by: Gavin Shan <gwshan@linux•vnet.ibm.com>
>>
>>>---
>>>arch/powerpc/platforms/powernv/pci-ioda.c | 14 +++++++++-----
>>>1 file changed, 9 insertions(+), 5 deletions(-)
>>>
>>>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
>>>index 9b41dba..7192e62 100644
>>>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>>>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>>>@@ -2987,12 +2987,16 @@ static resource_size_t pnv_pci_iov_resource_alignment(struct pci_dev *pdev,
>>> int resno)
>>>{
>>> struct pci_dn *pdn = pci_get_pdn(pdev);
>>>- resource_size_t align, iov_align;
>>>-
>>>- iov_align = resource_size(&pdev->resource[resno]);
>>>- if (iov_align)
>>>- return iov_align;
>>>+ resource_size_t align;
>>>
>>>+ /*
>>>+ * On PowerNV platform, IOV BAR is mapped by M64 BAR to enable the
>>>+ * SR-IOV. While from hardware perspective, the range mapped by M64
>>>+ * BAR should be size aligned.
>>>+ *
>>>+ * This function return the total IOV BAR size if expanded or just the
>>>+ * individual size if not.
>>>+ */
>>> align = pci_iov_resource_size(pdev, resno);
>>> if (pdn->vfs_expanded)
>>> return pdn->vfs_expanded * align;
>>>--
>>>1.7.9.5
>>>
>>
>
>
>--
>Alexey
--
Richard Yang
Help you, Help me
next prev parent reply other threads:[~2015-08-06 9:41 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-29 7:22 [PATCH] powerpc/powernv: use one M64 BAR in Single PE mode for one VF BAR Wei Yang
2015-07-30 1:15 ` Gavin Shan
2015-07-30 5:43 ` Wei Yang
2015-07-31 0:13 ` Gavin Shan
2015-07-31 2:01 ` Wei Yang
2015-08-05 1:24 ` [PATCH V2 0/6] Redesign SR-IOV on PowerNV Wei Yang
2015-08-05 1:24 ` [PATCH V2 1/6] powerpc/powernv: don't enable SRIOV when VF BAR contains non M64 BAR Wei Yang
2015-08-06 4:35 ` Gavin Shan
2015-08-06 6:10 ` Alexey Kardashevskiy
2015-08-06 6:57 ` Gavin Shan
2015-08-06 7:47 ` Alexey Kardashevskiy
2015-08-06 11:07 ` Gavin Shan
2015-08-06 14:13 ` Wei Yang
2015-08-07 1:24 ` Alexey Kardashevskiy
2015-08-06 14:10 ` Wei Yang
2015-08-07 1:20 ` Gavin Shan
2015-08-07 2:24 ` Wei Yang
2015-08-07 3:50 ` Gavin Shan
2015-08-07 7:14 ` Alexey Kardashevskiy
2015-08-10 1:40 ` Wei Yang
2015-08-05 1:24 ` [PATCH V2 2/6] powerpc/powernv: simplify the calculation of iov resource Wei Yang
2015-08-06 4:51 ` Gavin Shan
2015-08-06 9:00 ` Alexey Kardashevskiy
2015-08-06 9:41 ` Wei Yang [this message]
2015-08-06 10:15 ` Alexey Kardashevskiy
2015-08-07 1:36 ` Wei Yang
2015-08-06 13:49 ` Wei Yang
2015-08-07 1:08 ` Gavin Shan
2015-08-05 1:25 ` [PATCH V2 3/6] powerpc/powernv: use one M64 BAR in Single PE mode for one VF BAR Wei Yang
2015-08-06 5:20 ` Gavin Shan
2015-08-06 9:36 ` Wei Yang
2015-08-06 10:07 ` Gavin Shan
2015-08-07 1:48 ` Wei Yang
2015-08-07 8:13 ` Alexey Kardashevskiy
2015-08-06 10:04 ` Alexey Kardashevskiy
2015-08-07 2:01 ` Wei Yang
2015-08-07 8:59 ` Alexey Kardashevskiy
2015-08-10 1:48 ` Wei Yang
2015-08-05 1:25 ` [PATCH V2 4/6] powerpc/powernv: replace the hard coded boundary with gate Wei Yang
2015-08-06 5:26 ` Gavin Shan
2015-08-07 9:11 ` Alexey Kardashevskiy
2015-08-05 1:25 ` [PATCH V2 5/6] powerpc/powernv: boundary the total vf bar size instead of the individual one Wei Yang
2015-08-06 5:28 ` Gavin Shan
2015-08-06 14:03 ` Wei Yang
2015-08-07 1:23 ` Gavin Shan
2015-08-07 2:25 ` Wei Yang
2015-08-05 1:25 ` [PATCH V2 6/6] powerpc/powernv: allocate discrete PE# when using M64 BAR in Single PE mode Wei Yang
2015-08-06 5:36 ` Gavin Shan
2015-08-06 13:41 ` Wei Yang
2015-08-07 1:36 ` Gavin Shan
2015-08-07 2:33 ` Wei Yang
2015-08-07 3:43 ` Gavin Shan
2015-08-07 5:44 ` Wei Yang
2015-08-07 5:54 ` Gavin Shan
2015-08-07 6:25 ` Wei Yang
2015-08-07 10:00 ` Alexey Kardashevskiy
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