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iommu/vt-d: change intel-iommu to use IOVA frame numbers 

Make intel-iommu map/unmap/invalidate work with IOVA pfns instead of
pointers to "struct iova". This avoids using the iova struct from the IOVA
red-black tree and the resulting explicit find_iova() on unmap.

This patch will allow us to cache IOVAs in the next patch, in order to
avoid rbtree operations for the majority of map/unmap operations.

Note: In eliminating the find_iova() operation, we have also eliminated
the sanity check previously done in the unmap flow. Arguably, this was
overhead that is better avoided in production code, but it could be
brought back as a debug option for driver development.

Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[mad@cs.technion.ac.il: rebased, fixed to not break iova api, and reworded
 the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Omer Peleg 2016-04-20 11:33:57 +03:00 committed by David Woodhouse
parent 0824c5920b
commit 2aac630429
1 changed files with 29 additions and 32 deletions
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61
drivers/iommu/intel-iommu.c
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@ -459,7 +459,7 @@ static LIST_HEAD(dmar_rmrr_units);
static void flush_unmaps_timeout(unsigned long data); static void flush_unmaps_timeout(unsigned long data);
struct deferred_flush_entry { struct deferred_flush_entry {
struct iova *iova; unsigned long iova_pfn;
unsigned long nrpages; unsigned long nrpages;
struct dmar_domain *domain; struct dmar_domain *domain;
struct page *freelist; struct page *freelist;
@ -3353,7 +3353,7 @@ error:
} }
/* This takes a number of _MM_ pages, not VTD pages */ /* This takes a number of _MM_ pages, not VTD pages */
static struct iova *intel_alloc_iova(struct device *dev, static unsigned long intel_alloc_iova(struct device *dev,
struct dmar_domain *domain, struct dmar_domain *domain,
unsigned long nrpages, uint64_t dma_mask) unsigned long nrpages, uint64_t dma_mask)
{ {
@ -3373,16 +3373,16 @@ static struct iova *intel_alloc_iova(struct device *dev,
iova = alloc_iova(&domain->iovad, nrpages, iova = alloc_iova(&domain->iovad, nrpages,
IOVA_PFN(DMA_BIT_MASK(32)), 1); IOVA_PFN(DMA_BIT_MASK(32)), 1);
if (iova) if (iova)
return iova; return iova->pfn_lo;
} }
iova = alloc_iova(&domain->iovad, nrpages, IOVA_PFN(dma_mask), 1); iova = alloc_iova(&domain->iovad, nrpages, IOVA_PFN(dma_mask), 1);
if (unlikely(!iova)) { if (unlikely(!iova)) {
pr_err("Allocating %ld-page iova for %s failed", pr_err("Allocating %ld-page iova for %s failed",
nrpages, dev_name(dev)); nrpages, dev_name(dev));
return NULL; return 0;
} }
return iova; return iova->pfn_lo;
} }
static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev) static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)
@ -3480,7 +3480,7 @@ static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr,
{ {
struct dmar_domain *domain; struct dmar_domain *domain;
phys_addr_t start_paddr; phys_addr_t start_paddr;
struct iova *iova; unsigned long iova_pfn;
int prot = 0; int prot = 0;
int ret; int ret;
struct intel_iommu *iommu; struct intel_iommu *iommu;
@ -3498,8 +3498,8 @@ static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr,
iommu = domain_get_iommu(domain); iommu = domain_get_iommu(domain);
size = aligned_nrpages(paddr, size); size = aligned_nrpages(paddr, size);
iova = intel_alloc_iova(dev, domain, dma_to_mm_pfn(size), dma_mask); iova_pfn = intel_alloc_iova(dev, domain, dma_to_mm_pfn(size), dma_mask);
if (!iova) if (!iova_pfn)
goto error; goto error;
/* /*
@ -3517,7 +3517,7 @@ static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr,
* might have two guest_addr mapping to the same host paddr, but this * might have two guest_addr mapping to the same host paddr, but this
* is not a big problem * is not a big problem
*/ */
ret = domain_pfn_mapping(domain, mm_to_dma_pfn(iova->pfn_lo), ret = domain_pfn_mapping(domain, mm_to_dma_pfn(iova_pfn),
mm_to_dma_pfn(paddr_pfn), size, prot); mm_to_dma_pfn(paddr_pfn), size, prot);
if (ret) if (ret)
goto error; goto error;
@ -3525,18 +3525,18 @@ static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr,
/* it's a non-present to present mapping. Only flush if caching mode */ /* it's a non-present to present mapping. Only flush if caching mode */
if (cap_caching_mode(iommu->cap)) if (cap_caching_mode(iommu->cap))
iommu_flush_iotlb_psi(iommu, domain, iommu_flush_iotlb_psi(iommu, domain,
mm_to_dma_pfn(iova->pfn_lo), mm_to_dma_pfn(iova_pfn),
size, 0, 1); size, 0, 1);
else else
iommu_flush_write_buffer(iommu); iommu_flush_write_buffer(iommu);
start_paddr = (phys_addr_t)iova->pfn_lo << PAGE_SHIFT; start_paddr = (phys_addr_t)iova_pfn << PAGE_SHIFT;
start_paddr += paddr & ~PAGE_MASK; start_paddr += paddr & ~PAGE_MASK;
return start_paddr; return start_paddr;
error: error:
if (iova) if (iova_pfn)
__free_iova(&domain->iovad, iova); free_iova(&domain->iovad, iova_pfn);
pr_err("Device %s request: %zx@%llx dir %d --- failed\n", pr_err("Device %s request: %zx@%llx dir %d --- failed\n",
dev_name(dev), size, (unsigned long long)paddr, dir); dev_name(dev), size, (unsigned long long)paddr, dir);
return 0; return 0;
@ -3576,7 +3576,7 @@ static void flush_unmaps(struct deferred_flush_data *flush_data)
unsigned long mask; unsigned long mask;
struct deferred_flush_entry *entry = struct deferred_flush_entry *entry =
&flush_table->entries[j]; &flush_table->entries[j];
struct iova *iova = entry->iova; unsigned long iova_pfn = entry->iova_pfn;
unsigned long nrpages = entry->nrpages; unsigned long nrpages = entry->nrpages;
struct dmar_domain *domain = entry->domain; struct dmar_domain *domain = entry->domain;
struct page *freelist = entry->freelist; struct page *freelist = entry->freelist;
@ -3584,14 +3584,14 @@ static void flush_unmaps(struct deferred_flush_data *flush_data)
/* On real hardware multiple invalidations are expensive */ /* On real hardware multiple invalidations are expensive */
if (cap_caching_mode(iommu->cap)) if (cap_caching_mode(iommu->cap))
iommu_flush_iotlb_psi(iommu, domain, iommu_flush_iotlb_psi(iommu, domain,
mm_to_dma_pfn(iova->pfn_lo), mm_to_dma_pfn(iova_pfn),
nrpages, !freelist, 0); nrpages, !freelist, 0);
else { else {
mask = ilog2(nrpages); mask = ilog2(nrpages);
iommu_flush_dev_iotlb(domain, iommu_flush_dev_iotlb(domain,
(uint64_t)iova->pfn_lo << PAGE_SHIFT, mask); (uint64_t)iova_pfn << PAGE_SHIFT, mask);
} }
__free_iova(&domain->iovad, iova); free_iova(&domain->iovad, iova_pfn);
if (freelist) if (freelist)
dma_free_pagelist(freelist); dma_free_pagelist(freelist);
} }
@ -3611,7 +3611,7 @@ static void flush_unmaps_timeout(unsigned long cpuid)
spin_unlock_irqrestore(&flush_data->lock, flags); spin_unlock_irqrestore(&flush_data->lock, flags);
} }
static void add_unmap(struct dmar_domain *dom, struct iova *iova, static void add_unmap(struct dmar_domain *dom, unsigned long iova_pfn,
unsigned long nrpages, struct page *freelist) unsigned long nrpages, struct page *freelist)
{ {
unsigned long flags; unsigned long flags;
@ -3645,7 +3645,7 @@ static void add_unmap(struct dmar_domain *dom, struct iova *iova,
entry = &flush_data->tables[iommu_id].entries[entry_id]; entry = &flush_data->tables[iommu_id].entries[entry_id];
entry->domain = dom; entry->domain = dom;
entry->iova = iova; entry->iova_pfn = iova_pfn;
entry->nrpages = nrpages; entry->nrpages = nrpages;
entry->freelist = freelist; entry->freelist = freelist;
@ -3664,7 +3664,7 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
struct dmar_domain *domain; struct dmar_domain *domain;
unsigned long start_pfn, last_pfn; unsigned long start_pfn, last_pfn;
unsigned long nrpages; unsigned long nrpages;
struct iova *iova; unsigned long iova_pfn;
struct intel_iommu *iommu; struct intel_iommu *iommu;
struct page *freelist; struct page *freelist;
@ -3676,13 +3676,10 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
iommu = domain_get_iommu(domain); iommu = domain_get_iommu(domain);
iova = find_iova(&domain->iovad, IOVA_PFN(dev_addr)); iova_pfn = IOVA_PFN(dev_addr);
if (WARN_ONCE(!iova, "Driver unmaps unmatched page at PFN %llx\n",
(unsigned long long)dev_addr))
return;
nrpages = aligned_nrpages(dev_addr, size); nrpages = aligned_nrpages(dev_addr, size);
start_pfn = mm_to_dma_pfn(iova->pfn_lo); start_pfn = mm_to_dma_pfn(iova_pfn);
last_pfn = start_pfn + nrpages - 1; last_pfn = start_pfn + nrpages - 1;
pr_debug("Device %s unmapping: pfn %lx-%lx\n", pr_debug("Device %s unmapping: pfn %lx-%lx\n",
@ -3694,10 +3691,10 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
iommu_flush_iotlb_psi(iommu, domain, start_pfn, iommu_flush_iotlb_psi(iommu, domain, start_pfn,
nrpages, !freelist, 0); nrpages, !freelist, 0);
/* free iova */ /* free iova */
__free_iova(&domain->iovad, iova); free_iova(&domain->iovad, iova_pfn);
dma_free_pagelist(freelist); dma_free_pagelist(freelist);
} else { } else {
add_unmap(domain, iova, nrpages, freelist); add_unmap(domain, iova_pfn, nrpages, freelist);
/* /*
* queue up the release of the unmap to save the 1/6th of the * queue up the release of the unmap to save the 1/6th of the
* cpu used up by the iotlb flush operation... * cpu used up by the iotlb flush operation...
@ -3810,7 +3807,7 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
struct dmar_domain *domain; struct dmar_domain *domain;
size_t size = 0; size_t size = 0;
int prot = 0; int prot = 0;
struct iova *iova = NULL; unsigned long iova_pfn;
int ret; int ret;
struct scatterlist *sg; struct scatterlist *sg;
unsigned long start_vpfn; unsigned long start_vpfn;
@ -3829,9 +3826,9 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
for_each_sg(sglist, sg, nelems, i) for_each_sg(sglist, sg, nelems, i)
size += aligned_nrpages(sg->offset, sg->length); size += aligned_nrpages(sg->offset, sg->length);
iova = intel_alloc_iova(dev, domain, dma_to_mm_pfn(size), iova_pfn = intel_alloc_iova(dev, domain, dma_to_mm_pfn(size),
*dev->dma_mask); *dev->dma_mask);
if (!iova) { if (!iova_pfn) {
sglist->dma_length = 0; sglist->dma_length = 0;
return 0; return 0;
} }
@ -3846,13 +3843,13 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
prot |= DMA_PTE_WRITE; prot |= DMA_PTE_WRITE;
start_vpfn = mm_to_dma_pfn(iova->pfn_lo); start_vpfn = mm_to_dma_pfn(iova_pfn);
ret = domain_sg_mapping(domain, start_vpfn, sglist, size, prot); ret = domain_sg_mapping(domain, start_vpfn, sglist, size, prot);
if (unlikely(ret)) { if (unlikely(ret)) {
dma_pte_free_pagetable(domain, start_vpfn, dma_pte_free_pagetable(domain, start_vpfn,
start_vpfn + size - 1); start_vpfn + size - 1);
__free_iova(&domain->iovad, iova); free_iova(&domain->iovad, iova_pfn);
return 0; return 0;
} }