linux-kernel - [PATCH v1 5/6] PCI/P2PDMA: Refactor pci_p2pdma_map

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Date:   Thu, 10 Jun 2021 10:06:08 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian König <christian.koenig@....com>,
        John Hubbard <jhubbard@...dia.com>,
        Don Dutile <ddutile@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH v1 5/6] PCI/P2PDMA: Refactor pci_p2pdma_map_type() to take pagemap and device

All callers of pci_p2pdma_map_type() have a struct dev_pgmap and a
struct device (of the client doing the DMA transfer). Thus move the
conversion to struct pci_devs for the provider and client into this
function.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/pci/p2pdma.c | 30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 2de4a9e2da58..5dc1f9f62a93 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -814,12 +814,20 @@ void pci_p2pmem_publish(struct pci_dev *pdev, bool publish)
 }
 EXPORT_SYMBOL_GPL(pci_p2pmem_publish);
 
-static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct pci_dev *provider,
-						    struct pci_dev *client)
+static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap,
+						    struct device *dev)
 {
+	struct pci_dev *provider = to_p2p_pgmap(pgmap)->provider;
+	struct pci_dev *client;
+
 	if (!provider->p2pdma)
 		return PCI_P2PDMA_MAP_NOT_SUPPORTED;
 
+	if (!dev_is_pci(dev))
+		return PCI_P2PDMA_MAP_NOT_SUPPORTED;
+
+	client = to_pci_dev(dev);
+
 	return xa_to_value(xa_load(&provider->p2pdma->map_types,
 				   map_types_idx(client)));
 }
@@ -856,14 +864,8 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 {
 	struct pci_p2pdma_pagemap *p2p_pgmap =
 		to_p2p_pgmap(sg_page(sg)->pgmap);
-	struct pci_dev *client;
-
-	if (WARN_ON_ONCE(!dev_is_pci(dev)))
-		return 0;
 
-	client = to_pci_dev(dev);
-
-	switch (pci_p2pdma_map_type(p2p_pgmap->provider, client)) {
+	switch (pci_p2pdma_map_type(sg_page(sg)->pgmap, dev)) {
 	case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE:
 		return dma_map_sg_attrs(dev, sg, nents, dir, attrs);
 	case PCI_P2PDMA_MAP_BUS_ADDR:
@@ -887,17 +889,9 @@ EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs);
 void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 		int nents, enum dma_data_direction dir, unsigned long attrs)
 {
-	struct pci_p2pdma_pagemap *p2p_pgmap =
-		to_p2p_pgmap(sg_page(sg)->pgmap);
 	enum pci_p2pdma_map_type map_type;
-	struct pci_dev *client;
-
-	if (WARN_ON_ONCE(!dev_is_pci(dev)))
-		return;
-
-	client = to_pci_dev(dev);
 
-	map_type = pci_p2pdma_map_type(p2p_pgmap->provider, client);
+	map_type = pci_p2pdma_map_type(sg_page(sg)->pgmap, dev);
 
 	if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE)
 		dma_unmap_sg_attrs(dev, sg, nents, dir, attrs);
-- 
2.20.1