powerpc/iommu: Implement IOMMU pools to improve multiqueue adapter performance

[deliverable/linux.git] / arch / powerpc / include / asm / iommu.h

diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index 957a83f436465e52256855730a51ef307a7f6bdf..cbfe678e3dbea1ac8b33a087d736e3d102a741a4 100644 (file)
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -53,6 +53,16 @@ static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
  */
 #define IOMAP_MAX_ORDER                13
 
+#define IOMMU_POOL_HASHBITS    2
+#define IOMMU_NR_POOLS         (1 << IOMMU_POOL_HASHBITS)
+
+struct iommu_pool {
+       unsigned long start;
+       unsigned long end;
+       unsigned long hint;
+       spinlock_t lock;
+} ____cacheline_aligned_in_smp;
+
 struct iommu_table {
        unsigned long  it_busno;     /* Bus number this table belongs to */
        unsigned long  it_size;      /* Size of iommu table in entries */
@@ -61,10 +71,10 @@ struct iommu_table {
        unsigned long  it_index;     /* which iommu table this is */
        unsigned long  it_type;      /* type: PCI or Virtual Bus */
        unsigned long  it_blocksize; /* Entries in each block (cacheline) */
-       unsigned long  it_hint;      /* Hint for next alloc */
-       unsigned long  it_largehint; /* Hint for large allocs */
-       unsigned long  it_halfpoint; /* Breaking point for small/large allocs */
-       spinlock_t     it_lock;      /* Protects it_map */
+       unsigned long  poolsize;
+       unsigned long  nr_pools;
+       struct iommu_pool large_pool;
+       struct iommu_pool pools[IOMMU_NR_POOLS];
        unsigned long *it_map;       /* A simple allocation bitmap for now */
 };