diff options
Diffstat (limited to 'drivers/iommu/amd_iommu.c')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index a8e4c5adade7..c0b2f4fc6bfc 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -105,6 +105,9 @@ struct flush_queue { DEFINE_PER_CPU(struct flush_queue, flush_queue); +static atomic_t queue_timer_on; +static struct timer_list queue_timer; + /* * Domain for untranslated devices - only allocated * if iommu=pt passed on kernel cmd line. @@ -2151,6 +2154,24 @@ static void __queue_flush(struct flush_queue *queue) queue->next = 0; } +void queue_flush_timeout(unsigned long unsused) +{ + int cpu; + + atomic_set(&queue_timer_on, 0); + + for_each_possible_cpu(cpu) { + struct flush_queue *queue; + unsigned long flags; + + queue = per_cpu_ptr(&flush_queue, cpu); + spin_lock_irqsave(&queue->lock, flags); + if (queue->next > 0) + __queue_flush(queue); + spin_unlock_irqrestore(&queue->lock, flags); + } +} + static void queue_add(struct dma_ops_domain *dma_dom, unsigned long address, unsigned long pages) { @@ -2176,6 +2197,10 @@ static void queue_add(struct dma_ops_domain *dma_dom, entry->dma_dom = dma_dom; spin_unlock_irqrestore(&queue->lock, flags); + + if (atomic_cmpxchg(&queue_timer_on, 0, 1) == 0) + mod_timer(&queue_timer, jiffies + msecs_to_jiffies(10)); + put_cpu_ptr(&flush_queue); } @@ -2634,6 +2659,9 @@ out_put_iova: int __init amd_iommu_init_dma_ops(void) { + setup_timer(&queue_timer, queue_flush_timeout, 0); + atomic_set(&queue_timer_on, 0); + swiotlb = iommu_pass_through ? 1 : 0; iommu_detected = 1; |