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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2018-03-22 16:22:36 +0100
committerJoerg Roedel <jroedel@suse.de>2018-03-29 10:38:15 +0200
commitea6166f4b83e9cfba1c18f46a764d50045682fe5 (patch)
tree89e549e2897afcdbf09ea31831744b1a55b27315 /drivers/iommu
parent2bc00180890427dcc092b2f2b0d03c904bcade29 (diff)
iommu/amd: Split irq_lookup_table out of the amd_iommu_devtable_lock
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index fcfdce70707d..a87d2fee68db 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -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;
}