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Merge branch 'for-next/iommu/iova' into for-next/iommu/core
IOVA allocator updates for 5.11, including removal of unused symbols and functions as well as some optimisations to improve allocation behaviour in the face of fragmentation. * for-next/iommu/iova: iommu: Stop exporting free_iova_mem() iommu: Stop exporting alloc_iova_mem() iommu: Delete split_and_remove_iova() iommu: avoid taking iova_rbtree_lock twice iommu/iova: Free global iova rcache on iova alloc failure iommu/iova: Retry from last rb tree node if iova search fails
This commit is contained in:
Will Deacon
commit
1ab2bf5831
@ -25,6 +25,7 @@ static void init_iova_rcaches(struct iova_domain *iovad);
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static void free_iova_rcaches(struct iova_domain *iovad);
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static void fq_destroy_all_entries(struct iova_domain *iovad);
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static void fq_flush_timeout(struct timer_list *t);
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static void free_global_cached_iovas(struct iova_domain *iovad);
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void
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init_iova_domain(struct iova_domain *iovad, unsigned long granule,
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@ -184,8 +185,9 @@ static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
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struct rb_node *curr, *prev;
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struct iova *curr_iova;
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unsigned long flags;
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unsigned long new_pfn;
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unsigned long new_pfn, retry_pfn;
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unsigned long align_mask = ~0UL;
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unsigned long high_pfn = limit_pfn, low_pfn = iovad->start_pfn;
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if (size_aligned)
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align_mask <<= fls_long(size - 1);
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@ -198,15 +200,25 @@ static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
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curr = __get_cached_rbnode(iovad, limit_pfn);
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curr_iova = rb_entry(curr, struct iova, node);
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retry_pfn = curr_iova->pfn_hi + 1;
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retry:
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do {
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limit_pfn = min(limit_pfn, curr_iova->pfn_lo);
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new_pfn = (limit_pfn - size) & align_mask;
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high_pfn = min(high_pfn, curr_iova->pfn_lo);
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new_pfn = (high_pfn - size) & align_mask;
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prev = curr;
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curr = rb_prev(curr);
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curr_iova = rb_entry(curr, struct iova, node);
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} while (curr && new_pfn <= curr_iova->pfn_hi);
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} while (curr && new_pfn <= curr_iova->pfn_hi && new_pfn >= low_pfn);
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if (limit_pfn < size || new_pfn < iovad->start_pfn) {
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if (high_pfn < size || new_pfn < low_pfn) {
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if (low_pfn == iovad->start_pfn && retry_pfn < limit_pfn) {
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high_pfn = limit_pfn;
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low_pfn = retry_pfn;
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curr = &iovad->anchor.node;
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curr_iova = rb_entry(curr, struct iova, node);
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goto retry;
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}
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iovad->max32_alloc_size = size;
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goto iova32_full;
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}
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@ -231,18 +243,16 @@ static struct kmem_cache *iova_cache;
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static unsigned int iova_cache_users;
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static DEFINE_MUTEX(iova_cache_mutex);
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struct iova *alloc_iova_mem(void)
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static struct iova *alloc_iova_mem(void)
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{
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return kmem_cache_zalloc(iova_cache, GFP_ATOMIC | __GFP_NOWARN);
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}
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EXPORT_SYMBOL(alloc_iova_mem);
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void free_iova_mem(struct iova *iova)
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static void free_iova_mem(struct iova *iova)
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{
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if (iova->pfn_lo != IOVA_ANCHOR)
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kmem_cache_free(iova_cache, iova);
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}
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EXPORT_SYMBOL(free_iova_mem);
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int iova_cache_get(void)
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{
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@ -390,10 +400,14 @@ EXPORT_SYMBOL_GPL(__free_iova);
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void
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free_iova(struct iova_domain *iovad, unsigned long pfn)
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{
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struct iova *iova = find_iova(iovad, pfn);
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unsigned long flags;
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struct iova *iova;
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spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
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iova = private_find_iova(iovad, pfn);
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if (iova)
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__free_iova(iovad, iova);
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private_free_iova(iovad, iova);
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spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
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}
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EXPORT_SYMBOL_GPL(free_iova);
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@ -431,6 +445,7 @@ retry:
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flush_rcache = false;
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for_each_online_cpu(cpu)
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free_cpu_cached_iovas(cpu, iovad);
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free_global_cached_iovas(iovad);
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goto retry;
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}
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@ -725,47 +740,6 @@ copy_reserved_iova(struct iova_domain *from, struct iova_domain *to)
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}
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EXPORT_SYMBOL_GPL(copy_reserved_iova);
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struct iova *
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split_and_remove_iova(struct iova_domain *iovad, struct iova *iova,
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unsigned long pfn_lo, unsigned long pfn_hi)
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{
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unsigned long flags;
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struct iova *prev = NULL, *next = NULL;
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spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
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if (iova->pfn_lo < pfn_lo) {
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prev = alloc_and_init_iova(iova->pfn_lo, pfn_lo - 1);
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if (prev == NULL)
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goto error;
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}
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if (iova->pfn_hi > pfn_hi) {
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next = alloc_and_init_iova(pfn_hi + 1, iova->pfn_hi);
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if (next == NULL)
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goto error;
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}
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__cached_rbnode_delete_update(iovad, iova);
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rb_erase(&iova->node, &iovad->rbroot);
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if (prev) {
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iova_insert_rbtree(&iovad->rbroot, prev, NULL);
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iova->pfn_lo = pfn_lo;
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}
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if (next) {
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iova_insert_rbtree(&iovad->rbroot, next, NULL);
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iova->pfn_hi = pfn_hi;
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}
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spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
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return iova;
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error:
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spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
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if (prev)
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free_iova_mem(prev);
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return NULL;
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}
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/*
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* Magazine caches for IOVA ranges. For an introduction to magazines,
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* see the USENIX 2001 paper "Magazines and Vmem: Extending the Slab
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@ -1046,5 +1020,25 @@ void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad)
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}
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}
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/*
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* free all the IOVA ranges of global cache
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*/
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static void free_global_cached_iovas(struct iova_domain *iovad)
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{
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struct iova_rcache *rcache;
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unsigned long flags;
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int i, j;
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for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
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rcache = &iovad->rcaches[i];
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spin_lock_irqsave(&rcache->lock, flags);
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for (j = 0; j < rcache->depot_size; ++j) {
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iova_magazine_free_pfns(rcache->depot[j], iovad);
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iova_magazine_free(rcache->depot[j]);
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}
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rcache->depot_size = 0;
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spin_unlock_irqrestore(&rcache->lock, flags);
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}
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}
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MODULE_AUTHOR("Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>");
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MODULE_LICENSE("GPL");
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@ -136,8 +136,6 @@ static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
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int iova_cache_get(void);
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void iova_cache_put(void);
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struct iova *alloc_iova_mem(void);
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void free_iova_mem(struct iova *iova);
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void free_iova(struct iova_domain *iovad, unsigned long pfn);
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void __free_iova(struct iova_domain *iovad, struct iova *iova);
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struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
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@ -160,8 +158,6 @@ int init_iova_flush_queue(struct iova_domain *iovad,
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iova_flush_cb flush_cb, iova_entry_dtor entry_dtor);
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struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
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void put_iova_domain(struct iova_domain *iovad);
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struct iova *split_and_remove_iova(struct iova_domain *iovad,
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struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
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void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
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#else
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static inline int iova_cache_get(void)
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@ -173,15 +169,6 @@ static inline void iova_cache_put(void)
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{
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}
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static inline struct iova *alloc_iova_mem(void)
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{
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return NULL;
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}
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static inline void free_iova_mem(struct iova *iova)
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{
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}
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static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
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{
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}
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@ -258,14 +245,6 @@ static inline void put_iova_domain(struct iova_domain *iovad)
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{
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}
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static inline struct iova *split_and_remove_iova(struct iova_domain *iovad,
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struct iova *iova,
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unsigned long pfn_lo,
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unsigned long pfn_hi)
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{
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return NULL;
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}
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static inline void free_cpu_cached_iovas(unsigned int cpu,
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struct iova_domain *iovad)
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{
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