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Message-Id: <20200915155122.1768241-17-hch@lst.de>
Date: Tue, 15 Sep 2020 17:51:20 +0200
From: Christoph Hellwig <hch@....de>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
Joonyoung Shim <jy0922.shim@...sung.com>,
Seung-Woo Kim <sw0312.kim@...sung.com>,
Ben Skeggs <bskeggs@...hat.com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Tomasz Figa <tfiga@...omium.org>,
Matt Porter <mporter@...nel.crashing.org>,
iommu@...ts.linux-foundation.org
Cc: Stefan Richter <stefanr@...6.in-berlin.de>,
linux1394-devel@...ts.sourceforge.net, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
linux-parisc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
nouveau@...ts.freedesktop.org, netdev@...r.kernel.org,
linux-scsi@...r.kernel.org, linux-mm@...ck.org,
alsa-devel@...a-project.org
Subject: [PATCH 16/18] dma-mapping: add new {alloc,free}_noncoherent dma_map_ops methods
This will allow IOMMU drivers to allocate non-contigous memory and
return a vmapped virtual address.
Signed-off-by: Christoph Hellwig <hch@....de>
---
include/linux/dma-mapping.h | 5 +++++
kernel/dma/mapping.c | 33 +++++++++++++++++++++++++++------
2 files changed, 32 insertions(+), 6 deletions(-)
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index bf592cf0db4acb..b4b5d75260d6dc 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -80,6 +80,11 @@ struct dma_map_ops {
gfp_t gfp);
void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
dma_addr_t dma_handle, enum dma_data_direction dir);
+ void* (*alloc_noncoherent)(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, enum dma_data_direction dir,
+ gfp_t gfp);
+ void (*free_noncoherent)(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle, enum dma_data_direction dir);
int (*mmap)(struct device *, struct vm_area_struct *,
void *, dma_addr_t, size_t,
unsigned long attrs);
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 6f86c925b8251d..8614d7d2ee59a9 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -502,19 +502,40 @@ EXPORT_SYMBOL_GPL(dma_free_pages);
void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
- struct page *page;
+ const struct dma_map_ops *ops = get_dma_ops(dev);
+ void *vaddr;
- page = dma_alloc_pages(dev, size, dma_handle, dir, gfp);
- if (!page)
- return NULL;
- return page_address(page);
+ if (!ops || !ops->alloc_noncoherent) {
+ struct page *page;
+
+ page = dma_alloc_pages(dev, size, dma_handle, dir, gfp);
+ if (!page)
+ return NULL;
+ return page_address(page);
+ }
+
+ size = PAGE_ALIGN(size);
+ vaddr = ops->alloc_noncoherent(dev, size, dma_handle, dir, gfp);
+ if (vaddr)
+ debug_dma_map_page(dev, virt_to_page(vaddr), 0, size, dir,
+ *dma_handle);
+ return vaddr;
}
EXPORT_SYMBOL_GPL(dma_alloc_noncoherent);
void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
- dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir);
+ const struct dma_map_ops *ops = get_dma_ops(dev);
+
+ if (!ops || !ops->free_noncoherent) {
+ dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir);
+ return;
+ }
+
+ size = PAGE_ALIGN(size);
+ debug_dma_unmap_page(dev, dma_handle, size, dir);
+ ops->free_noncoherent(dev, size, vaddr, dma_handle, dir);
}
EXPORT_SYMBOL_GPL(dma_free_noncoherent);
--
2.28.0
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