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iommu/amd: Set up data structures for flush queue 

The flush queue is the equivalent to defered-flushing in the
Intel VT-d driver. This patch sets up the data structures
needed for this.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2016-07-06 11:55:37 +02:00
parent bda350dbdb
commit c5b5da9c79
1 changed files with 39 additions and 1 deletions
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40
drivers/iommu/amd_iommu.c
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@ -89,6 +89,22 @@ LIST_HEAD(ioapic_map);
LIST_HEAD(hpet_map);
LIST_HEAD(acpihid_map);
#define FLUSH_QUEUE_SIZE 256
struct flush_queue_entry {
unsigned long iova_pfn;
unsigned long pages;
struct dma_ops_domain *dma_dom;
};
struct flush_queue {
spinlock_t lock;
unsigned next;
struct flush_queue_entry *entries;
};
DEFINE_PER_CPU(struct flush_queue, flush_queue);
/*
* Domain for untranslated devices - only allocated
* if iommu=pt passed on kernel cmd line.
@ -2508,7 +2524,7 @@ static int init_reserved_iova_ranges(void)
int __init amd_iommu_init_api(void)
{
int ret, err = 0;
int ret, cpu, err = 0;
ret = iova_cache_get();
if (ret)
@ -2518,6 +2534,18 @@ int __init amd_iommu_init_api(void)
if (ret)
return ret;
for_each_possible_cpu(cpu) {
struct flush_queue *queue = per_cpu_ptr(&flush_queue, cpu);
queue->entries = kzalloc(FLUSH_QUEUE_SIZE *
sizeof(*queue->entries),
GFP_KERNEL);
if (!queue->entries)
goto out_put_iova;
spin_lock_init(&queue->lock);
}
err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
if (err)
return err;
@ -2530,6 +2558,15 @@ int __init amd_iommu_init_api(void)
if (err)
return err;
return 0;
out_put_iova:
for_each_possible_cpu(cpu) {
struct flush_queue *queue = per_cpu_ptr(&flush_queue, cpu);
kfree(queue->entries);
}
return -ENOMEM;
}
int __init amd_iommu_init_dma_ops(void)
@ -2552,6 +2589,7 @@ int __init amd_iommu_init_dma_ops(void)
pr_info("AMD-Vi: Lazy IO/TLB flushing enabled\n");
return 0;
}
/*****************************************************************************