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iommu/virtio: Add map/unmap_pages() callbacks implementation

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Map/unmap_pags() allows map and unmap multiple pages of the same size
in one call, which can improve performance by reducing the numbers of
vmexits. With map/unmap_pages() implemented, the prior map/unmap()
callbacks are deprecated.

Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/20220605161152.3171-1-tina.zhang@intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Tina Zhang 2022-06-06 00:11:52 +08:00 committed by Joerg Roedel
parent a111daf0c5
commit 7e62edd7a3
1 changed files with 12 additions and 6 deletions
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18
drivers/iommu/virtio-iommu.c
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@ -788,11 +788,13 @@ static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev)
return 0;
}
static int viommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
static int viommu_map_pages(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t pgsize, size_t pgcount,
int prot, gfp_t gfp, size_t *mapped)
{
int ret;
u32 flags;
size_t size = pgsize * pgcount;
u64 end = iova + size - 1;
struct virtio_iommu_req_map map;
struct viommu_domain *vdomain = to_viommu_domain(domain);
@ -823,17 +825,21 @@ static int viommu_map(struct iommu_domain *domain, unsigned long iova,
ret = viommu_send_req_sync(vdomain->viommu, &map, sizeof(map));
if (ret)
viommu_del_mappings(vdomain, iova, end);
else if (mapped)
*mapped = size;
return ret;
}
static size_t viommu_unmap(struct iommu_domain *domain, unsigned long iova,
size_t size, struct iommu_iotlb_gather *gather)
static size_t viommu_unmap_pages(struct iommu_domain *domain, unsigned long iova,
size_t pgsize, size_t pgcount,
struct iommu_iotlb_gather *gather)
{
int ret = 0;
size_t unmapped;
struct virtio_iommu_req_unmap unmap;
struct viommu_domain *vdomain = to_viommu_domain(domain);
size_t size = pgsize * pgcount;
unmapped = viommu_del_mappings(vdomain, iova, iova + size - 1);
if (unmapped < size)
@ -1018,8 +1024,8 @@ static struct iommu_ops viommu_ops = {
.owner = THIS_MODULE,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = viommu_attach_dev,
.map = viommu_map,
.unmap = viommu_unmap,
.map_pages = viommu_map_pages,
.unmap_pages = viommu_unmap_pages,
.iova_to_phys = viommu_iova_to_phys,
.iotlb_sync = viommu_iotlb_sync,
.free = viommu_domain_free,