I/OAT: Split PCI startup from DMA handling code

Split the general PCI startup from the DMA handling code in order to
prepare for adding support for DCA services and future versions of the
ioatdma device.

    [Rusty Russell] Removal of __unsafe() usage.

Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 42 insertions, 138 deletions

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 2db05f614843..eef83ea291a3 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -39,19 +39,15 @@
 #define INITIAL_IOAT_DESC_COUNT 128
 
 #define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common)
-#define to_ioat_device(dev) container_of(dev, struct ioat_device, common)
+#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common)
 #define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node)
 #define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, async_tx)
 
 /* internal functions */
 static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan);
 static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan);
-static int __devinit ioat_probe(struct pci_dev *pdev,
-				const struct pci_device_id *ent);
-static void ioat_shutdown(struct pci_dev *pdev);
-static void __devexit ioat_remove(struct pci_dev *pdev);
 
-static int ioat_dma_enumerate_channels(struct ioat_device *device)
+static int ioat_dma_enumerate_channels(struct ioatdma_device *device)
 {
 	u8 xfercap_scale;
 	u32 xfercap;
@@ -158,17 +154,17 @@ static struct ioat_desc_sw *ioat_dma_alloc_descriptor(
 {
 	struct ioat_dma_descriptor *desc;
 	struct ioat_desc_sw *desc_sw;
-	struct ioat_device *ioat_device;
+	struct ioatdma_device *ioatdma_device;
 	dma_addr_t phys;
 
-	ioat_device = to_ioat_device(ioat_chan->common.device);
-	desc = pci_pool_alloc(ioat_device->dma_pool, flags, &phys);
+	ioatdma_device = to_ioatdma_device(ioat_chan->common.device);
+	desc = pci_pool_alloc(ioatdma_device->dma_pool, flags, &phys);
 	if (unlikely(!desc))
 		return NULL;
 
 	desc_sw = kzalloc(sizeof(*desc_sw), flags);
 	if (unlikely(!desc_sw)) {
-		pci_pool_free(ioat_device->dma_pool, desc, phys);
+		pci_pool_free(ioatdma_device->dma_pool, desc, phys);
 		return NULL;
 	}
 
@@ -245,9 +241,8 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *chan)
 static void ioat_dma_free_chan_resources(struct dma_chan *chan)
 {
 	struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
-	struct ioat_device *ioat_device = to_ioat_device(chan->device);
+	struct ioatdma_device *ioatdma_device = to_ioatdma_device(chan->device);
 	struct ioat_desc_sw *desc, *_desc;
-	u16 chanctrl;
 	int in_use_descs = 0;
 
 	ioat_dma_memcpy_cleanup(ioat_chan);
@@ -258,19 +253,19 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan)
 	list_for_each_entry_safe(desc, _desc, &ioat_chan->used_desc, node) {
 		in_use_descs++;
 		list_del(&desc->node);
-		pci_pool_free(ioat_device->dma_pool, desc->hw,
+		pci_pool_free(ioatdma_device->dma_pool, desc->hw,
 			      desc->async_tx.phys);
 		kfree(desc);
 	}
 	list_for_each_entry_safe(desc, _desc, &ioat_chan->free_desc, node) {
 		list_del(&desc->node);
-		pci_pool_free(ioat_device->dma_pool, desc->hw,
+		pci_pool_free(ioatdma_device->dma_pool, desc->hw,
 			      desc->async_tx.phys);
 		kfree(desc);
 	}
 	spin_unlock_bh(&ioat_chan->desc_lock);
 
-	pci_pool_free(ioat_device->completion_pool,
+	pci_pool_free(ioatdma_device->completion_pool,
 		      ioat_chan->completion_virt,
 		      ioat_chan->completion_addr);
 
@@ -514,25 +509,9 @@ static enum dma_status ioat_dma_is_complete(struct dma_chan *chan,
 
 /* PCI API */
 
-static struct pci_device_id ioat_pci_tbl[] = {
-	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
-	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB)  },
-	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
-	{ PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
-	{ 0, }
-};
-
-static struct pci_driver ioat_pci_driver = {
-	.name 	= "ioatdma",
-	.id_table = ioat_pci_tbl,
-	.probe	= ioat_probe,
-	.shutdown = ioat_shutdown,
-	.remove	= __devexit_p(ioat_remove),
-};
-
 static irqreturn_t ioat_do_interrupt(int irq, void *data)
 {
-	struct ioat_device *instance = data;
+	struct ioatdma_device *instance = data;
 	unsigned long attnstatus;
 	u8 intrctrl;
 
@@ -592,7 +571,7 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
  */
 #define IOAT_TEST_SIZE 2000
 
-static int ioat_self_test(struct ioat_device *device)
+static int ioat_self_test(struct ioatdma_device *device)
 {
 	int i;
 	u8 *src;
@@ -660,46 +639,25 @@ out:
 	return err;
 }
 
-static int __devinit ioat_probe(struct pci_dev *pdev,
-				const struct pci_device_id *ent)
+struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
+				      void __iomem *iobase)
 {
 	int err;
-	unsigned long mmio_start, mmio_len;
-	void __iomem *reg_base;
-	struct ioat_device *device;
-
-	err = pci_enable_device(pdev);
-	if (err)
-		goto err_enable_device;
-
-	err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
-	if (err)
-		err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
-	if (err)
-		goto err_set_dma_mask;
-
-	err = pci_request_regions(pdev, ioat_pci_driver.name);
-	if (err)
-		goto err_request_regions;
-
-	mmio_start = pci_resource_start(pdev, 0);
-	mmio_len = pci_resource_len(pdev, 0);
-
-	reg_base = ioremap(mmio_start, mmio_len);
-	if (!reg_base) {
-		err = -ENOMEM;
-		goto err_ioremap;
-	}
+	struct ioatdma_device *device;
 
 	device = kzalloc(sizeof(*device), GFP_KERNEL);
 	if (!device) {
 		err = -ENOMEM;
 		goto err_kzalloc;
 	}
+	device->pdev = pdev;
+	device->reg_base = iobase;
+	device->version = readb(device->reg_base + IOAT_VER_OFFSET);
 
 	/* DMA coherent memory pool for DMA descriptor allocations */
 	device->dma_pool = pci_pool_create("dma_desc_pool", pdev,
-		sizeof(struct ioat_dma_descriptor), 64, 0);
+					   sizeof(struct ioat_dma_descriptor),
+					   64, 0);
 	if (!device->dma_pool) {
 		err = -ENOMEM;
 		goto err_dma_pool;
@@ -713,26 +671,6 @@ static int __devinit ioat_probe(struct pci_dev *pdev,
 		goto err_completion_pool;
 	}
 
-	device->pdev = pdev;
-	pci_set_drvdata(pdev, device);
-#ifdef CONFIG_PCI_MSI
-	if (pci_enable_msi(pdev) == 0) {
-		device->msi = 1;
-	} else {
-		device->msi = 0;
-	}
-#endif
-	err = request_irq(pdev->irq, &ioat_do_interrupt, IRQF_SHARED, "ioat",
-		device);
-	if (err)
-		goto err_irq;
-
-	device->reg_base = reg_base;
-
-	writeb(IOAT_INTRCTRL_MASTER_INT_EN,
-	       device->reg_base + IOAT_INTRCTRL_OFFSET);
-	pci_set_master(pdev);
-
 	INIT_LIST_HEAD(&device->common.channels);
 	ioat_dma_enumerate_channels(device);
 
@@ -746,9 +684,19 @@ static int __devinit ioat_probe(struct pci_dev *pdev,
 	device->common.device_issue_pending = ioat_dma_memcpy_issue_pending;
 	device->common.device_dependency_added = ioat_dma_dependency_added;
 	device->common.dev = &pdev->dev;
-	printk(KERN_INFO
-		 "ioatdma: Intel(R) I/OAT DMA Engine found, %d channels\n",
-		 device->common.chancnt);
+	printk(KERN_INFO "ioatdma: Intel(R) I/OAT DMA Engine found,"
+	       " %d channels, device version 0x%02x\n",
+	       device->common.chancnt, device->version);
+
+	pci_set_drvdata(pdev, device);
+	err = request_irq(pdev->irq, &ioat_do_interrupt, IRQF_SHARED, "ioat",
+		device);
+	if (err)
+		goto err_irq;
+
+	writeb(IOAT_INTRCTRL_MASTER_INT_EN,
+	       device->reg_base + IOAT_INTRCTRL_OFFSET);
+	pci_set_master(pdev);
 
 	err = ioat_self_test(device);
 	if (err)
@@ -756,9 +704,10 @@ static int __devinit ioat_probe(struct pci_dev *pdev,
 
 	dma_async_device_register(&device->common);
 
-	return 0;
+	return device;
 
 err_self_test:
+	free_irq(device->pdev->irq, device);
 err_irq:
 	pci_pool_destroy(device->completion_pool);
 err_completion_pool:
@@ -766,47 +715,24 @@ err_completion_pool:
 err_dma_pool:
 	kfree(device);
 err_kzalloc:
-	iounmap(reg_base);
-err_ioremap:
-	pci_release_regions(pdev);
-err_request_regions:
-err_set_dma_mask:
-	pci_disable_device(pdev);
-err_enable_device:
-
-	printk(KERN_INFO
-		"ioatdma: Intel(R) I/OAT DMA Engine initialization failed\n");
-
-	return err;
-}
-
-static void ioat_shutdown(struct pci_dev *pdev)
-{
-	struct ioat_device *device;
-	device = pci_get_drvdata(pdev);
-
-	dma_async_device_unregister(&device->common);
+	iounmap(iobase);
+	printk(KERN_ERR
+	       "ioatdma: Intel(R) I/OAT DMA Engine initialization failed\n");
+	return NULL;
 }
 
-static void __devexit ioat_remove(struct pci_dev *pdev)
+void ioat_dma_remove(struct ioatdma_device *device)
 {
-	struct ioat_device *device;
 	struct dma_chan *chan, *_chan;
 	struct ioat_dma_chan *ioat_chan;
 
-	device = pci_get_drvdata(pdev);
 	dma_async_device_unregister(&device->common);
 
 	free_irq(device->pdev->irq, device);
-#ifdef CONFIG_PCI_MSI
-	if (device->msi)
-		pci_disable_msi(device->pdev);
-#endif
+
 	pci_pool_destroy(device->dma_pool);
 	pci_pool_destroy(device->completion_pool);
-	iounmap(device->reg_base);
-	pci_release_regions(pdev);
-	pci_disable_device(pdev);
+
 	list_for_each_entry_safe(chan, _chan,
 				 &device->common.channels, device_node) {
 		ioat_chan = to_ioat_chan(chan);
@@ -816,25 +742,3 @@ static void __devexit ioat_remove(struct pci_dev *pdev)
 	kfree(device);
 }
 
-/* MODULE API */
-MODULE_VERSION("1.9");
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Intel Corporation");
-
-static int __init ioat_init_module(void)
-{
-	/* it's currently unsafe to unload this module */
-	/* if forced, worst case is that rmmod hangs */
-	__unsafe(THIS_MODULE);
-
-	return pci_register_driver(&ioat_pci_driver);
-}
-
-module_init(ioat_init_module);
-
-static void __exit ioat_exit_module(void)
-{
-	pci_unregister_driver(&ioat_pci_driver);
-}
-
-module_exit(ioat_exit_module);