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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2018-03-22 16:22:35 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2018-03-29 10:38:15 +0200 |
| commit | 2bc00180890427dcc092b2f2b0d03c904bcade29 (patch) | |
| tree | 5cf7d4442c55b5b062e928a0d85aeea69d9d8ac2 /drivers/iommu/amd_iommu.c | |
| parent | 779da73273fc4c4c6f41579a95e4fb7880a1720e (diff) | |
| download | linux-2bc00180890427dcc092b2f2b0d03c904bcade29.tar.bz2 | |
iommu/amd: Split domain id out of amd_iommu_devtable_lock
domain_id_alloc() and domain_id_free() is used for id management. Those
two function share a bitmap (amd_iommu_pd_alloc_bitmap) and set/clear
bits based on id allocation. There is no need to share this with
amd_iommu_devtable_lock, it can use its own lock for this operation.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd_iommu.c')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index d4c2b1a11924..fcfdce70707d 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -81,6 +81,7 @@ #define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38)) static DEFINE_RWLOCK(amd_iommu_devtable_lock); +static DEFINE_SPINLOCK(pd_bitmap_lock); /* List of all available dev_data structures */ static LLIST_HEAD(dev_data_list); @@ -1600,29 +1601,26 @@ static void del_domain_from_list(struct protection_domain *domain) static u16 domain_id_alloc(void) { - unsigned long flags; int id; - write_lock_irqsave(&amd_iommu_devtable_lock, flags); + spin_lock(&pd_bitmap_lock); id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID); BUG_ON(id == 0); if (id > 0 && id < MAX_DOMAIN_ID) __set_bit(id, amd_iommu_pd_alloc_bitmap); else id = 0; - write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); + spin_unlock(&pd_bitmap_lock); return id; } static void domain_id_free(int id) { - unsigned long flags; - - write_lock_irqsave(&amd_iommu_devtable_lock, flags); + spin_lock(&pd_bitmap_lock); if (id > 0 && id < MAX_DOMAIN_ID) __clear_bit(id, amd_iommu_pd_alloc_bitmap); - write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); + spin_unlock(&pd_bitmap_lock); } #define DEFINE_FREE_PT_FN(LVL, FN) \ |