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iommu/amd: Implement flush queue

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With the flush queue the IOMMU TLBs will not be flushed at
every dma-ops unmap operation. The unmapped ranges will be
queued and flushed at once, when the queue is full. This
makes unmapping operations a lot faster (on average) and
restores the performance of the old address allocator.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2016-07-06 13:07:22 +02:00
parent f1eae7c580
commit b1516a1465
1 changed files with 67 additions and 4 deletions
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71
drivers/iommu/amd_iommu.c
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@ -2120,6 +2120,66 @@ static struct iommu_group *amd_iommu_device_group(struct device *dev)
*
*****************************************************************************/
static void __queue_flush(struct flush_queue *queue)
{
struct protection_domain *domain;
unsigned long flags;
int idx;
/* First flush TLB of all known domains */
spin_lock_irqsave(&amd_iommu_pd_lock, flags);
list_for_each_entry(domain, &amd_iommu_pd_list, list)
domain_flush_tlb(domain);
spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
/* Wait until flushes have completed */
domain_flush_complete(NULL);
for (idx = 0; idx < queue->next; ++idx) {
struct flush_queue_entry *entry;
entry = queue->entries + idx;
free_iova_fast(&entry->dma_dom->iovad,
entry->iova_pfn,
entry->pages);
/* Not really necessary, just to make sure we catch any bugs */
entry->dma_dom = NULL;
}
queue->next = 0;
}
static void queue_add(struct dma_ops_domain *dma_dom,
unsigned long address, unsigned long pages)
{
struct flush_queue_entry *entry;
struct flush_queue *queue;
unsigned long flags;
int idx;
pages = __roundup_pow_of_two(pages);
address >>= PAGE_SHIFT;
queue = get_cpu_ptr(&flush_queue);
spin_lock_irqsave(&queue->lock, flags);
if (queue->next == FLUSH_QUEUE_SIZE)
__queue_flush(queue);
idx = queue->next++;
entry = queue->entries + idx;
entry->iova_pfn = address;
entry->pages = pages;
entry->dma_dom = dma_dom;
spin_unlock_irqrestore(&queue->lock, flags);
put_cpu_ptr(&flush_queue);
}
/*
* In the dma_ops path we only have the struct device. This function
* finds the corresponding IOMMU, the protection domain and the
@ -2258,10 +2318,13 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
start += PAGE_SIZE;
}
domain_flush_tlb(&dma_dom->domain);
domain_flush_complete(&dma_dom->domain);
dma_ops_free_iova(dma_dom, dma_addr, pages);
if (amd_iommu_unmap_flush) {
dma_ops_free_iova(dma_dom, dma_addr, pages);
domain_flush_tlb(&dma_dom->domain);
domain_flush_complete(&dma_dom->domain);
} else {
queue_add(dma_dom, dma_addr, pages);
}
}
/*