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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>
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779da73273
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2bc0018089
1 changed files with 5 additions and 7 deletions
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@ -81,6 +81,7 @@
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#define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38))
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static DEFINE_RWLOCK(amd_iommu_devtable_lock);
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static DEFINE_SPINLOCK(pd_bitmap_lock);
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/* List of all available dev_data structures */
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static LLIST_HEAD(dev_data_list);
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@ -1600,29 +1601,26 @@ static void del_domain_from_list(struct protection_domain *domain)
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static u16 domain_id_alloc(void)
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{
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unsigned long flags;
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int id;
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write_lock_irqsave(&amd_iommu_devtable_lock, flags);
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spin_lock(&pd_bitmap_lock);
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id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
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BUG_ON(id == 0);
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if (id > 0 && id < MAX_DOMAIN_ID)
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__set_bit(id, amd_iommu_pd_alloc_bitmap);
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else
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id = 0;
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write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
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spin_unlock(&pd_bitmap_lock);
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return id;
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}
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static void domain_id_free(int id)
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{
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unsigned long flags;
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write_lock_irqsave(&amd_iommu_devtable_lock, flags);
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spin_lock(&pd_bitmap_lock);
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if (id > 0 && id < MAX_DOMAIN_ID)
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__clear_bit(id, amd_iommu_pd_alloc_bitmap);
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write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
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spin_unlock(&pd_bitmap_lock);
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}
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#define DEFINE_FREE_PT_FN(LVL, FN) \
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