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Message-ID: <bc3ff6f2126ae270eb378befda8199735501306f.1734436840.git.leon@kernel.org>
Date: Tue, 17 Dec 2024 15:00:21 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Jens Axboe <axboe@...nel.dk>,
Jason Gunthorpe <jgg@...pe.ca>,
Robin Murphy <robin.murphy@....com>,
Joerg Roedel <joro@...tes.org>,
Will Deacon <will@...nel.org>,
Christoph Hellwig <hch@....de>,
Sagi Grimberg <sagi@...mberg.me>
Cc: Keith Busch <kbusch@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Logan Gunthorpe <logang@...tatee.com>,
Yishai Hadas <yishaih@...dia.com>,
Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
Kevin Tian <kevin.tian@...el.com>,
Alex Williamson <alex.williamson@...hat.com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Jérôme Glisse <jglisse@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-block@...r.kernel.org,
linux-rdma@...r.kernel.org,
iommu@...ts.linux.dev,
linux-nvme@...ts.infradead.org,
linux-pci@...r.kernel.org,
kvm@...r.kernel.org,
linux-mm@...ck.org,
Randy Dunlap <rdunlap@...radead.org>
Subject: [PATCH v5 03/17] iommu: generalize the batched sync after map interface
From: Christoph Hellwig <hch@....de>
For the upcoming IOVA-based DMA API we want to use the interface batch the
sync after mapping multiple entries from dma-iommu without having a
scatterlist.
For that move more sanity checks from the callers into __iommu_map and
make that function available outside of iommu.c as iommu_map_nosync.
Add a wrapper for the map_sync as iommu_sync_map so that callers don't
need to poke into the methods directly.
Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Will Deacon <will@...nel.org>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
drivers/iommu/iommu.c | 65 +++++++++++++++++++------------------------
include/linux/iommu.h | 4 +++
2 files changed, 33 insertions(+), 36 deletions(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 9bc0c74cca3c..ec75d14497bf 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2412,8 +2412,8 @@ static size_t iommu_pgsize(struct iommu_domain *domain, unsigned long iova,
return pgsize;
}
-static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
- phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+int iommu_map_nosync(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
{
const struct iommu_domain_ops *ops = domain->ops;
unsigned long orig_iova = iova;
@@ -2422,12 +2422,19 @@ static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t orig_paddr = paddr;
int ret = 0;
+ might_sleep_if(gfpflags_allow_blocking(gfp));
+
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
return -EINVAL;
if (WARN_ON(!ops->map_pages || domain->pgsize_bitmap == 0UL))
return -ENODEV;
+ /* Discourage passing strange GFP flags */
+ if (WARN_ON_ONCE(gfp & (__GFP_COMP | __GFP_DMA | __GFP_DMA32 |
+ __GFP_HIGHMEM)))
+ return -EINVAL;
+
/* find out the minimum page size supported */
min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
@@ -2475,31 +2482,27 @@ static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
return ret;
}
-int iommu_map(struct iommu_domain *domain, unsigned long iova,
- phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+int iommu_sync_map(struct iommu_domain *domain, unsigned long iova, size_t size)
{
const struct iommu_domain_ops *ops = domain->ops;
- int ret;
-
- might_sleep_if(gfpflags_allow_blocking(gfp));
- /* Discourage passing strange GFP flags */
- if (WARN_ON_ONCE(gfp & (__GFP_COMP | __GFP_DMA | __GFP_DMA32 |
- __GFP_HIGHMEM)))
- return -EINVAL;
+ if (!ops->iotlb_sync_map)
+ return 0;
+ return ops->iotlb_sync_map(domain, iova, size);
+}
- ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
- if (ret == 0 && ops->iotlb_sync_map) {
- ret = ops->iotlb_sync_map(domain, iova, size);
- if (ret)
- goto out_err;
- }
+int iommu_map(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+{
+ int ret;
- return ret;
+ ret = iommu_map_nosync(domain, iova, paddr, size, prot, gfp);
+ if (ret)
+ return ret;
-out_err:
- /* undo mappings already done */
- iommu_unmap(domain, iova, size);
+ ret = iommu_sync_map(domain, iova, size);
+ if (ret)
+ iommu_unmap(domain, iova, size);
return ret;
}
@@ -2599,26 +2602,17 @@ ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
struct scatterlist *sg, unsigned int nents, int prot,
gfp_t gfp)
{
- const struct iommu_domain_ops *ops = domain->ops;
size_t len = 0, mapped = 0;
phys_addr_t start;
unsigned int i = 0;
int ret;
- might_sleep_if(gfpflags_allow_blocking(gfp));
-
- /* Discourage passing strange GFP flags */
- if (WARN_ON_ONCE(gfp & (__GFP_COMP | __GFP_DMA | __GFP_DMA32 |
- __GFP_HIGHMEM)))
- return -EINVAL;
-
while (i <= nents) {
phys_addr_t s_phys = sg_phys(sg);
if (len && s_phys != start + len) {
- ret = __iommu_map(domain, iova + mapped, start,
+ ret = iommu_map_nosync(domain, iova + mapped, start,
len, prot, gfp);
-
if (ret)
goto out_err;
@@ -2641,11 +2635,10 @@ ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
sg = sg_next(sg);
}
- if (ops->iotlb_sync_map) {
- ret = ops->iotlb_sync_map(domain, iova, mapped);
- if (ret)
- goto out_err;
- }
+ ret = iommu_sync_map(domain, iova, mapped);
+ if (ret)
+ goto out_err;
+
return mapped;
out_err:
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 318d27841130..de77012f76d5 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -862,6 +862,10 @@ extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
+int iommu_map_nosync(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
+int iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+ size_t size);
extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
size_t size);
extern size_t iommu_unmap_fast(struct iommu_domain *domain,
--
2.47.0
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