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iommu/amd: Split irq_lookup_table out of the amd_iommu_devtable_lock

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The function get_irq_table() reads/writes irq_lookup_table while holding
the amd_iommu_devtable_lock. It also modifies
amd_iommu_dev_table[].data[2].
set_dte_entry() is using amd_iommu_dev_table[].data[0|1] (under the
domain->lock) so it should be okay. The access to the iommu is
serialized with its own (iommu's) lock.

So split out get_irq_table() out of amd_iommu_devtable_lock's lock.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Sebastian Andrzej Siewior 2018-03-22 16:22:36 +01:00 committed by Joerg Roedel
parent 2bc0018089
commit ea6166f4b8
1 changed files with 3 additions and 2 deletions
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5
drivers/iommu/amd_iommu.c
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@ -82,6 +82,7 @@
static DEFINE_RWLOCK(amd_iommu_devtable_lock);
static DEFINE_SPINLOCK(pd_bitmap_lock);
static DEFINE_SPINLOCK(iommu_table_lock);
/* List of all available dev_data structures */
static LLIST_HEAD(dev_data_list);
@ -3623,7 +3624,7 @@ static struct irq_remap_table *alloc_irq_table(u16 devid, bool ioapic)
unsigned long flags;
u16 alias;
write_lock_irqsave(&amd_iommu_devtable_lock, flags);
spin_lock_irqsave(&iommu_table_lock, flags);
iommu = amd_iommu_rlookup_table[devid];
if (!iommu)
@ -3688,7 +3689,7 @@ out:
iommu_completion_wait(iommu);
out_unlock:
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
spin_unlock_irqrestore(&iommu_table_lock, flags);
return table;
}