ioat2,3: cacheline align software descriptor allocations

All the necessary fields for handling an ioat2,3 ring entry can fit into
one cacheline.  Move ->len prior to ->txd in struct ioat_ring_ent, and
move allocation of these entries to a hw-cache-aligned kmem cache to
reduce the number of cachelines dirtied for descriptor management.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c
index 460b773..fa3d6db 100644 (file)
--- a/drivers/dma/ioat/dma_v2.c
+++ b/drivers/dma/ioat/dma_v2.c
@@ -399,11 +399,12 @@ static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan, gfp_t f
                return NULL;
        memset(hw, 0, sizeof(*hw));
 
-       desc = kzalloc(sizeof(*desc), flags);
+       desc = kmem_cache_alloc(ioat2_cache, flags);
        if (!desc) {
                pci_pool_free(dma->dma_pool, hw, phys);
                return NULL;
        }
+       memset(desc, 0, sizeof(*desc));
 
        dma_async_tx_descriptor_init(&desc->txd, chan);
        desc->txd.tx_submit = ioat2_tx_submit_unlock;
@@ -418,7 +419,7 @@ static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *cha
 
        dma = to_ioatdma_device(chan->device);
        pci_pool_free(dma->dma_pool, desc->hw, desc->txd.phys);
-       kfree(desc);
+       kmem_cache_free(ioat2_cache, desc);
 }
 
 static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gfp_t flags)

diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h
index 9baa3d6..ac00adc 100644 (file)
--- a/drivers/dma/ioat/dma_v2.h
+++ b/drivers/dma/ioat/dma_v2.h
@@ -116,8 +116,8 @@ static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len
 
 struct ioat_ring_ent {
        struct ioat_dma_descriptor *hw;
-       struct dma_async_tx_descriptor txd;
        size_t len;
+       struct dma_async_tx_descriptor txd;
        #ifdef DEBUG
        int id;
        #endif
@@ -143,4 +143,5 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca);
 int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca);
 struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase);
 struct dca_provider * __devinit ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase);
+extern struct kmem_cache *ioat2_cache;
 #endif /* IOATDMA_V2_H */

diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c
index c4e4322..61086c6 100644 (file)
--- a/drivers/dma/ioat/pci.c
+++ b/drivers/dma/ioat/pci.c
@@ -69,6 +69,8 @@ static int ioat_dca_enabled = 1;
 module_param(ioat_dca_enabled, int, 0644);
 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
 
+struct kmem_cache *ioat2_cache;
+
 #define DRV_NAME "ioatdma"
 
 static struct pci_driver ioat_pci_driver = {
@@ -168,12 +170,24 @@ static void __devexit ioat_remove(struct pci_dev *pdev)
 
 static int __init ioat_init_module(void)
 {
-       return pci_register_driver(&ioat_pci_driver);
+       int err;
+
+       ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
+                                       0, SLAB_HWCACHE_ALIGN, NULL);
+       if (!ioat2_cache)
+               return -ENOMEM;
+
+       err = pci_register_driver(&ioat_pci_driver);
+       if (err)
+               kmem_cache_destroy(ioat2_cache);
+
+       return err;
 }
 module_init(ioat_init_module);
 
 static void __exit ioat_exit_module(void)
 {
        pci_unregister_driver(&ioat_pci_driver);
+       kmem_cache_destroy(ioat2_cache);
 }
 module_exit(ioat_exit_module);