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iommu: Add a gfp parameter to iommu_map_sg() 

Follow the pattern for iommu_map() and remove iommu_map_sg_atomic().

This allows __iommu_dma_alloc_noncontiguous() to use a GFP_KERNEL
allocation here, based on the provided gfp flags.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/3-v3-76b587fe28df+6e3-iommu_map_gfp_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jason Gunthorpe 2023-01-23 16:35:56 -04:00 committed by Joerg Roedel
parent 4dc6376af5
commit f2b2c051be
3 changed files with 18 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/iommu/dma-iommu.c
View File

@ -833,7 +833,8 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
arch_dma_prep_coherent(sg_page(sg), sg->length);
}
ret = iommu_map_sg_atomic(domain, iova, sgt->sgl, sgt->orig_nents, ioprot);
ret = iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, ioprot,
GFP_ATOMIC);
if (ret < 0 || ret < size)
goto out_free_sg;
@ -1281,7 +1282,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
* We'll leave any physical concatenation to the IOMMU driver's
* implementation - it knows better than we do.
*/
ret = iommu_map_sg_atomic(domain, iova, sg, nents, prot);
ret = iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC);
if (ret < 0 || ret < iova_len)
goto out_free_iova;

26
drivers/iommu/iommu.c
View File

@ -2470,9 +2470,9 @@ size_t iommu_unmap_fast(struct iommu_domain *domain,
}
EXPORT_SYMBOL_GPL(iommu_unmap_fast);
static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
struct scatterlist *sg, unsigned int nents, int prot,
gfp_t gfp)
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;
@ -2480,6 +2480,13 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
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);
@ -2519,21 +2526,8 @@ out_err:
return ret;
}
ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
struct scatterlist *sg, unsigned int nents, int prot)
{
might_sleep();
return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_KERNEL);
}
EXPORT_SYMBOL_GPL(iommu_map_sg);
ssize_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova,
struct scatterlist *sg, unsigned int nents, int prot)
{
return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC);
}
/**
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
* @domain: the iommu domain where the fault has happened

18
include/linux/iommu.h
View File

@ -474,10 +474,8 @@ extern size_t iommu_unmap_fast(struct iommu_domain *domain,
unsigned long iova, size_t size,
struct iommu_iotlb_gather *iotlb_gather);
extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
struct scatterlist *sg, unsigned int nents, int prot);
extern ssize_t iommu_map_sg_atomic(struct iommu_domain *domain,
unsigned long iova, struct scatterlist *sg,
unsigned int nents, int prot);
struct scatterlist *sg, unsigned int nents,
int prot, gfp_t gfp);
extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler, void *token);
@ -791,14 +789,7 @@ static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
unsigned long iova, struct scatterlist *sg,
unsigned int nents, int prot)
{
return -ENODEV;
}
static inline ssize_t iommu_map_sg_atomic(struct iommu_domain *domain,
unsigned long iova, struct scatterlist *sg,
unsigned int nents, int prot)
unsigned int nents, int prot, gfp_t gfp)
{
return -ENODEV;
}
@ -1109,7 +1100,8 @@ iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
unsigned long iova, struct sg_table *sgt, int prot)
{
return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot);
return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot,
GFP_KERNEL);
}
#ifdef CONFIG_IOMMU_DEBUGFS