Commit 091b6092 authored by Matthew Wilcox's avatar Matthew Wilcox
Browse files

NVMe: Switch to use DMA Pool API 



Calling dma_free_coherent from interrupt context causes warnings.
Using the DMA pools delays freeing until pool destruction, so avoids
the problem.

Signed-off-by: default avatarMatthew Wilcox <matthew.r.wilcox@intel.com>
parent d534df3c

drivers/block/nvme.c

+32 −7
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ struct nvme_dev { 
	struct nvme_queue **queues;

	u32 __iomem *dbs;

	struct pci_dev *pci_dev;

	struct dma_pool *prp_page_pool;

	int instance;

	int queue_count;

	u32 ctrl_config;
@@ -88,6 +89,7 @@ struct nvme_ns { 
 */

struct nvme_queue {

	struct device *q_dmadev;

	struct nvme_dev *dev;

	spinlock_t q_lock;

	struct nvme_command *sq_cmds;

	volatile struct nvme_completion *cqes;
@@ -247,10 +249,9 @@ static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) 
	return 0;

}



static __le64 *alloc_prp_list(struct nvme_queue *nvmeq, int length,

				 dma_addr_t *addr)

static __le64 *alloc_prp_list(struct nvme_dev *dev, dma_addr_t *addr)

{

	return dma_alloc_coherent(nvmeq->q_dmadev, PAGE_SIZE, addr, GFP_ATOMIC);

	return dma_pool_alloc(dev->prp_page_pool, GFP_ATOMIC, addr);

}



struct nvme_prps {
@@ -262,6 +263,7 @@ struct nvme_prps { 
static void nvme_free_prps(struct nvme_queue *nvmeq, struct nvme_prps *prps)

{

	const int last_prp = PAGE_SIZE / 8 - 1;

	struct nvme_dev *dev = nvmeq->dev;

	int i;

	dma_addr_t prp_dma;
@@ -272,8 +274,7 @@ static void nvme_free_prps(struct nvme_queue *nvmeq, struct nvme_prps *prps) 
	for (i = 0; i < prps->npages; i++) {

		__le64 *prp_list = prps->list[i];

		dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]);

		dma_free_coherent(nvmeq->q_dmadev, PAGE_SIZE, prp_list,

								prp_dma);

		dma_pool_free(dev->prp_page_pool, prp_list, prp_dma);

		prp_dma = next_prp_dma;

	}

	kfree(prps);
@@ -320,6 +321,7 @@ static struct nvme_prps *nvme_setup_prps(struct nvme_queue *nvmeq, 
					struct nvme_common_command *cmd,

					struct scatterlist *sg, int length)

{

	struct nvme_dev *dev = nvmeq->dev;

	int dma_len = sg_dma_len(sg);

	u64 dma_addr = sg_dma_address(sg);

	int offset = offset_in_page(dma_addr);
@@ -352,7 +354,7 @@ static struct nvme_prps *nvme_setup_prps(struct nvme_queue *nvmeq, 
	prps = kmalloc(sizeof(*prps) + sizeof(__le64 *) * npages, GFP_ATOMIC);

	prps->npages = npages;

	prp_page = 0;

	prp_list = alloc_prp_list(nvmeq, length, &prp_dma);

	prp_list = alloc_prp_list(dev, &prp_dma);

	prps->list[prp_page++] = prp_list;

	prps->first_dma = prp_dma;

	cmd->prp2 = cpu_to_le64(prp_dma);
@@ -360,7 +362,7 @@ static struct nvme_prps *nvme_setup_prps(struct nvme_queue *nvmeq, 
	for (;;) {

		if (i == PAGE_SIZE / 8 - 1) {

			__le64 *old_prp_list = prp_list;

			prp_list = alloc_prp_list(nvmeq, length, &prp_dma);

			prp_list = alloc_prp_list(dev, &prp_dma);

			prps->list[prp_page++] = prp_list;

			old_prp_list[i] = cpu_to_le64(prp_dma);

			i = 0;
@@ -752,6 +754,7 @@ static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, 
		goto free_cqdma;



	nvmeq->q_dmadev = dmadev;

	nvmeq->dev = dev;

	spin_lock_init(&nvmeq->q_lock);

	nvmeq->cq_head = 0;

	nvmeq->cq_phase = 1;
@@ -1302,6 +1305,22 @@ static int nvme_dev_remove(struct nvme_dev *dev) 
	return 0;

}



static int nvme_setup_prp_pools(struct nvme_dev *dev)

{

	struct device *dmadev = &dev->pci_dev->dev;

	dev->prp_page_pool = dma_pool_create("prp list page", dmadev,

						PAGE_SIZE, PAGE_SIZE, 0);

	if (!dev->prp_page_pool)

		return -ENOMEM;



	return 0;

}



static void nvme_release_prp_pools(struct nvme_dev *dev)

{

	dma_pool_destroy(dev->prp_page_pool);

}



/* XXX: Use an ida or something to let remove / add work correctly */

static void nvme_set_instance(struct nvme_dev *dev)

{
@@ -1346,6 +1365,10 @@ static int __devinit nvme_probe(struct pci_dev *pdev, 
	nvme_set_instance(dev);

	dev->entry[0].vector = pdev->irq;



	result = nvme_setup_prp_pools(dev);

	if (result)

		goto disable_msix;



	dev->bar = ioremap(pci_resource_start(pdev, 0), 8192);

	if (!dev->bar) {

		result = -ENOMEM;
@@ -1369,6 +1392,7 @@ static int __devinit nvme_probe(struct pci_dev *pdev, 
 disable_msix:

	pci_disable_msix(pdev);

	nvme_release_instance(dev);

	nvme_release_prp_pools(dev);

 disable:

	pci_disable_device(pdev);

	pci_release_regions(pdev);
@@ -1386,6 +1410,7 @@ static void __devexit nvme_remove(struct pci_dev *pdev) 
	pci_disable_msix(pdev);

	iounmap(dev->bar);

	nvme_release_instance(dev);

	nvme_release_prp_pools(dev);

	pci_disable_device(pdev);

	pci_release_regions(pdev);

	kfree(dev->queues);

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