From: Logan Gunthorpe <logang@deltatee.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-block@vger.kernel.org, linux-pci@vger.kernel.org,
linux-mm@kvack.org, iommu@lists.linux-foundation.org,
"Stephen Bates" <sbates@raithlin.com>,
"Christoph Hellwig" <hch@lst.de>,
"Dan Williams" <dan.j.williams@intel.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Christian König" <christian.koenig@amd.com>,
"Ira Weiny" <iweiny@intel.com>,
"John Hubbard" <jhubbard@nvidia.com>,
"Don Dutile" <ddutile@redhat.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Jakowski Andrzej" <andrzej.jakowski@intel.com>,
"Minturn Dave B" <dave.b.minturn@intel.com>,
"Jason Ekstrand" <jason@jlekstrand.net>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Xiong Jianxin" <jianxin.xiong@intel.com>
Subject: Re: [RFC PATCH v2 07/11] dma-mapping: Add flags to dma_map_ops to indicate PCI P2PDMA support
Date: Mon, 15 Mar 2021 10:33:13 -0600 [thread overview]
Message-ID: <e9a6689a-3cb7-aa30-33e7-b27015754b73@deltatee.com> (raw)
In-Reply-To: <20210313023657.GC3402637@iweiny-DESK2.sc.intel.com>
On 2021-03-12 7:36 p.m., Ira Weiny wrote:
> On Thu, Mar 11, 2021 at 04:31:37PM -0700, Logan Gunthorpe wrote:
>
>> +int dma_pci_p2pdma_supported(struct device *dev)
> ^^^
> bool?
Sure.
>
>> +{
>> + const struct dma_map_ops *ops = get_dma_ops(dev);
>> +
>> + return !ops || ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED;
>
> Is this logic correct? I would have expected.
>
> return (ops && ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED);
If ops is NULL then the operations in kernel/dma/direct.c are used and
support is added to those in patch 6. So it is correct as written.
Logan
WARNING: multiple messages have this Message-ID (diff)
From: Logan Gunthorpe <logang@deltatee.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-block@vger.kernel.org, linux-pci@vger.kernel.org,
linux-mm@kvack.org, iommu@lists.linux-foundation.org,
"Stephen Bates" <sbates@raithlin.com>,
"Christoph Hellwig" <hch@lst.de>,
"Dan Williams" <dan.j.williams@intel.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Christian König" <christian.koenig@amd.com>,
"Ira Weiny" <iweiny@intel.com>,
"John Hubbard" <jhubbard@nvidia.com>,
"Don Dutile" <ddutile@redhat.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Jakowski Andrzej" <andrzej.jakowski@intel.com>,
"Minturn Dave B" <dave.b.minturn@intel.com>,
"Jason Ekstrand" <jason@jlekstrand.net>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Xiong Jianxin" <jianxin.xiong@intel.com>
Subject: Re: [RFC PATCH v2 07/11] dma-mapping: Add flags to dma_map_ops to indicate PCI P2PDMA support
Date: Mon, 15 Mar 2021 10:33:13 -0600 [thread overview]
Message-ID: <e9a6689a-3cb7-aa30-33e7-b27015754b73@deltatee.com> (raw)
In-Reply-To: <20210313023657.GC3402637@iweiny-DESK2.sc.intel.com>
On 2021-03-12 7:36 p.m., Ira Weiny wrote:
> On Thu, Mar 11, 2021 at 04:31:37PM -0700, Logan Gunthorpe wrote:
>
>> +int dma_pci_p2pdma_supported(struct device *dev)
> ^^^
> bool?
Sure.
>
>> +{
>> + const struct dma_map_ops *ops = get_dma_ops(dev);
>> +
>> + return !ops || ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED;
>
> Is this logic correct? I would have expected.
>
> return (ops && ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED);
If ops is NULL then the operations in kernel/dma/direct.c are used and
support is added to those in patch 6. So it is correct as written.
Logan
_______________________________________________
Linux-nvme mailing list
Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme
WARNING: multiple messages have this Message-ID (diff)
From: Logan Gunthorpe <logang@deltatee.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: "Minturn Dave B" <dave.b.minturn@intel.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
linux-pci@vger.kernel.org,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Ira Weiny" <iweiny@intel.com>,
linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
"Stephen Bates" <sbates@raithlin.com>,
linux-block@vger.kernel.org, linux-mm@kvack.org,
iommu@lists.linux-foundation.org,
"Christian König" <christian.koenig@amd.com>,
"Jason Ekstrand" <jason@jlekstrand.net>,
"John Hubbard" <jhubbard@nvidia.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Jakowski Andrzej" <andrzej.jakowski@intel.com>,
"Christoph Hellwig" <hch@lst.de>,
"Xiong Jianxin" <jianxin.xiong@intel.com>
Subject: Re: [RFC PATCH v2 07/11] dma-mapping: Add flags to dma_map_ops to indicate PCI P2PDMA support
Date: Mon, 15 Mar 2021 10:33:13 -0600 [thread overview]
Message-ID: <e9a6689a-3cb7-aa30-33e7-b27015754b73@deltatee.com> (raw)
In-Reply-To: <20210313023657.GC3402637@iweiny-DESK2.sc.intel.com>
On 2021-03-12 7:36 p.m., Ira Weiny wrote:
> On Thu, Mar 11, 2021 at 04:31:37PM -0700, Logan Gunthorpe wrote:
>
>> +int dma_pci_p2pdma_supported(struct device *dev)
> ^^^
> bool?
Sure.
>
>> +{
>> + const struct dma_map_ops *ops = get_dma_ops(dev);
>> +
>> + return !ops || ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED;
>
> Is this logic correct? I would have expected.
>
> return (ops && ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED);
If ops is NULL then the operations in kernel/dma/direct.c are used and
support is added to those in patch 6. So it is correct as written.
Logan
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2021-03-15 16:34 UTC|newest]
Thread overview: 141+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-11 23:31 [RFC PATCH v2 00/11] Add support to dma_map_sg for P2PDMA Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` [RFC PATCH v2 01/11] PCI/P2PDMA: Pass gfp_mask flags to upstream_bridge_distance_warn() Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-12 20:39 ` Bjorn Helgaas
2021-03-12 20:39 ` Bjorn Helgaas
2021-03-12 20:39 ` Bjorn Helgaas
2021-03-12 20:53 ` Logan Gunthorpe
2021-03-12 20:53 ` Logan Gunthorpe
2021-03-12 20:53 ` Logan Gunthorpe
2021-03-11 23:31 ` [RFC PATCH v2 02/11] PCI/P2PDMA: Avoid pci_get_slot() which sleeps Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-12 20:57 ` Bjorn Helgaas
2021-03-12 20:57 ` Bjorn Helgaas
2021-03-12 20:57 ` Bjorn Helgaas
2021-03-12 21:37 ` Logan Gunthorpe
2021-03-12 21:37 ` Logan Gunthorpe
2021-03-12 21:37 ` Logan Gunthorpe
2021-03-11 23:31 ` [RFC PATCH v2 03/11] PCI/P2PDMA: Attempt to set map_type if it has not been set Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` [RFC PATCH v2 04/11] PCI/P2PDMA: Introduce pci_p2pdma_should_map_bus() and pci_p2pdma_bus_offset() Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-13 1:38 ` Ira Weiny
2021-03-13 1:38 ` Ira Weiny
2021-03-13 1:38 ` Ira Weiny
2021-03-15 16:27 ` Logan Gunthorpe
2021-03-15 16:27 ` Logan Gunthorpe
2021-03-15 16:27 ` Logan Gunthorpe
2021-03-24 17:21 ` Jason Gunthorpe
2021-03-24 17:21 ` Jason Gunthorpe
2021-03-24 17:21 ` Jason Gunthorpe
2021-03-24 18:34 ` Christian König
2021-03-24 18:34 ` Christian König
2021-03-24 18:34 ` Christian König
2021-03-13 2:32 ` Ira Weiny
2021-03-13 2:32 ` Ira Weiny
2021-03-13 2:32 ` Ira Weiny
2021-03-15 16:30 ` Logan Gunthorpe
2021-03-15 16:30 ` Logan Gunthorpe
2021-03-15 16:30 ` Logan Gunthorpe
2021-03-16 8:14 ` Christoph Hellwig
2021-03-16 8:14 ` Christoph Hellwig
2021-03-16 8:14 ` Christoph Hellwig
2021-03-11 23:31 ` [RFC PATCH v2 05/11] lib/scatterlist: Add flag for indicating P2PDMA segments in an SGL Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` [RFC PATCH v2 06/11] dma-direct: Support PCI P2PDMA pages in dma-direct map_sg Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-12 15:52 ` Robin Murphy
2021-03-12 15:52 ` Robin Murphy
2021-03-12 15:52 ` Robin Murphy
2021-03-12 16:24 ` Logan Gunthorpe
2021-03-12 16:24 ` Logan Gunthorpe
2021-03-12 16:24 ` Logan Gunthorpe
2021-03-12 18:11 ` Robin Murphy
2021-03-12 18:11 ` Robin Murphy
2021-03-12 18:11 ` Robin Murphy
2021-03-12 18:27 ` Logan Gunthorpe
2021-03-12 18:27 ` Logan Gunthorpe
2021-03-12 18:27 ` Logan Gunthorpe
2021-03-16 7:58 ` Christoph Hellwig
2021-03-16 7:58 ` Christoph Hellwig
2021-03-16 7:58 ` Christoph Hellwig
2021-03-16 15:54 ` Logan Gunthorpe
2021-03-16 15:54 ` Logan Gunthorpe
2021-03-16 15:54 ` Logan Gunthorpe
2021-03-16 7:56 ` Christoph Hellwig
2021-03-16 7:56 ` Christoph Hellwig
2021-03-16 7:56 ` Christoph Hellwig
2021-03-16 8:11 ` Christoph Hellwig
2021-03-16 8:11 ` Christoph Hellwig
2021-03-16 8:11 ` Christoph Hellwig
2021-03-11 23:31 ` [RFC PATCH v2 07/11] dma-mapping: Add flags to dma_map_ops to indicate PCI P2PDMA support Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-13 2:36 ` Ira Weiny
2021-03-13 2:36 ` Ira Weiny
2021-03-13 2:36 ` Ira Weiny
2021-03-15 16:33 ` Logan Gunthorpe [this message]
2021-03-15 16:33 ` Logan Gunthorpe
2021-03-15 16:33 ` Logan Gunthorpe
2021-03-16 8:00 ` Christoph Hellwig
2021-03-16 8:00 ` Christoph Hellwig
2021-03-16 8:00 ` Christoph Hellwig
2021-03-16 8:15 ` Christoph Hellwig
2021-03-16 8:15 ` Christoph Hellwig
2021-03-16 8:15 ` Christoph Hellwig
2021-03-11 23:31 ` [RFC PATCH v2 08/11] iommu/dma: Support PCI P2PDMA pages in dma-iommu map_sg Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-12 15:52 ` Robin Murphy
2021-03-12 15:52 ` Robin Murphy
2021-03-12 15:52 ` Robin Murphy
2021-03-12 17:03 ` Logan Gunthorpe
2021-03-12 17:03 ` Logan Gunthorpe
2021-03-12 17:03 ` Logan Gunthorpe
2021-03-12 19:47 ` Robin Murphy
2021-03-12 19:47 ` Robin Murphy
2021-03-12 19:47 ` Robin Murphy
2021-03-12 20:06 ` Logan Gunthorpe
2021-03-12 20:06 ` Logan Gunthorpe
2021-03-12 20:06 ` Logan Gunthorpe
2021-03-11 23:31 ` [RFC PATCH v2 09/11] block: Add BLK_STS_P2PDMA Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-16 8:00 ` Christoph Hellwig
2021-03-16 8:00 ` Christoph Hellwig
2021-03-16 8:00 ` Christoph Hellwig
2021-03-16 16:02 ` Logan Gunthorpe
2021-03-16 16:02 ` Logan Gunthorpe
2021-03-16 16:02 ` Logan Gunthorpe
2021-03-11 23:31 ` [RFC PATCH v2 10/11] nvme-pci: Check DMA ops when indicating support for PCI P2PDMA Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` [RFC PATCH v2 11/11] nvme-pci: Convert to using dma_map_sg for p2pdma pages Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:31 ` Logan Gunthorpe
2021-03-11 23:59 ` Jason Gunthorpe
2021-03-11 23:59 ` Jason Gunthorpe
2021-03-11 23:59 ` Jason Gunthorpe
2021-03-12 1:37 ` Logan Gunthorpe
2021-03-12 1:37 ` Logan Gunthorpe
2021-03-12 1:37 ` Logan Gunthorpe
2021-03-12 15:51 ` [RFC PATCH v2 00/11] Add support to dma_map_sg for P2PDMA Robin Murphy
2021-03-12 15:51 ` Robin Murphy
2021-03-12 15:51 ` Robin Murphy
2021-03-12 16:18 ` Logan Gunthorpe
2021-03-12 16:18 ` Logan Gunthorpe
2021-03-12 16:18 ` Logan Gunthorpe
2021-03-12 17:46 ` Robin Murphy
2021-03-12 17:46 ` Robin Murphy
2021-03-12 17:46 ` Robin Murphy
2021-03-12 18:24 ` Logan Gunthorpe
2021-03-12 18:24 ` Logan Gunthorpe
2021-03-12 18:24 ` Logan Gunthorpe
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