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authorOmer Peleg <omer@cs.technion.ac.il>2016-04-20 11:34:11 +0300
committerDavid Woodhouse <David.Woodhouse@intel.com>2016-04-20 15:44:48 -0400
commit22e2f9fa63b092923873fc8a52955151f4d83274 (patch)
treef06aca99478f01c1fe85ee19caa5fa92cb86ac10 /drivers/iommu
parent9257b4a206fc0229dd5f84b78e4d1ebf3f91d270 (diff)
downloadlinux-22e2f9fa63b092923873fc8a52955151f4d83274.tar.bz2
iommu/vt-d: Use per-cpu IOVA caching
Commit 9257b4a2 ('iommu/iova: introduce per-cpu caching to iova allocation') introduced per-CPU IOVA caches to massively improve scalability. Use them. Signed-off-by: Omer Peleg <omer@cs.technion.ac.il> [mad@cs.technion.ac.il: rebased, cleaned up 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> [dwmw2: split out VT-d part into a separate patch] Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-iommu.c47
1 files changed, 35 insertions, 12 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a8babc43e6d4..76e833278db0 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3357,7 +3357,7 @@ static unsigned long intel_alloc_iova(struct device *dev,
struct dmar_domain *domain,
unsigned long nrpages, uint64_t dma_mask)
{
- struct iova *iova = NULL;
+ unsigned long iova_pfn = 0;
/* Restrict dma_mask to the width that the iommu can handle */
dma_mask = min_t(uint64_t, DOMAIN_MAX_ADDR(domain->gaw), dma_mask);
@@ -3370,19 +3370,19 @@ static unsigned long intel_alloc_iova(struct device *dev,
* DMA_BIT_MASK(32) and if that fails then try allocating
* from higher range
*/
- iova = alloc_iova(&domain->iovad, nrpages,
- IOVA_PFN(DMA_BIT_MASK(32)), 1);
- if (iova)
- return iova->pfn_lo;
+ iova_pfn = alloc_iova_fast(&domain->iovad, nrpages,
+ IOVA_PFN(DMA_BIT_MASK(32)));
+ if (iova_pfn)
+ return iova_pfn;
}
- iova = alloc_iova(&domain->iovad, nrpages, IOVA_PFN(dma_mask), 1);
- if (unlikely(!iova)) {
+ iova_pfn = alloc_iova_fast(&domain->iovad, nrpages, IOVA_PFN(dma_mask));
+ if (unlikely(!iova_pfn)) {
pr_err("Allocating %ld-page iova for %s failed",
nrpages, dev_name(dev));
return 0;
}
- return iova->pfn_lo;
+ return iova_pfn;
}
static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)
@@ -3536,7 +3536,7 @@ static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr,
error:
if (iova_pfn)
- free_iova(&domain->iovad, iova_pfn);
+ free_iova_fast(&domain->iovad, iova_pfn, dma_to_mm_pfn(size));
pr_err("Device %s request: %zx@%llx dir %d --- failed\n",
dev_name(dev), size, (unsigned long long)paddr, dir);
return 0;
@@ -3591,7 +3591,7 @@ static void flush_unmaps(struct deferred_flush_data *flush_data)
iommu_flush_dev_iotlb(domain,
(uint64_t)iova_pfn << PAGE_SHIFT, mask);
}
- free_iova(&domain->iovad, iova_pfn);
+ free_iova_fast(&domain->iovad, iova_pfn, nrpages);
if (freelist)
dma_free_pagelist(freelist);
}
@@ -3691,7 +3691,7 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
iommu_flush_iotlb_psi(iommu, domain, start_pfn,
nrpages, !freelist, 0);
/* free iova */
- free_iova(&domain->iovad, iova_pfn);
+ free_iova_fast(&domain->iovad, iova_pfn, dma_to_mm_pfn(nrpages));
dma_free_pagelist(freelist);
} else {
add_unmap(domain, iova_pfn, nrpages, freelist);
@@ -3849,7 +3849,7 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
if (unlikely(ret)) {
dma_pte_free_pagetable(domain, start_vpfn,
start_vpfn + size - 1);
- free_iova(&domain->iovad, iova_pfn);
+ free_iova_fast(&domain->iovad, iova_pfn, dma_to_mm_pfn(size));
return 0;
}
@@ -4588,6 +4588,28 @@ static struct notifier_block intel_iommu_memory_nb = {
.priority = 0
};
+static void free_all_cpu_cached_iovas(unsigned int cpu)
+{
+ int i;
+
+ for (i = 0; i < g_num_of_iommus; i++) {
+ struct intel_iommu *iommu = g_iommus[i];
+ struct dmar_domain *domain;
+ u16 did;
+
+ if (!iommu)
+ continue;
+
+ for (did = 0; did < 0xffff; did++) {
+ domain = get_iommu_domain(iommu, did);
+
+ if (!domain)
+ continue;
+ free_cpu_cached_iovas(cpu, &domain->iovad);
+ }
+ }
+}
+
static int intel_iommu_cpu_notifier(struct notifier_block *nfb,
unsigned long action, void *v)
{
@@ -4596,6 +4618,7 @@ static int intel_iommu_cpu_notifier(struct notifier_block *nfb,
switch (action) {
case CPU_DEAD:
case CPU_DEAD_FROZEN:
+ free_all_cpu_cached_iovas(cpu);
flush_unmaps_timeout(cpu);
break;
}