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Commit 5149fd01 authored by Shannon Nelson's avatar Shannon Nelson Committed by Linus Torvalds
Browse files

I/OAT: clean up error handling and some print messages 



Make better use of dev_err(), and catch an error where the transaction
creation might fail.

Signed-off-by: default avatarShannon Nelson <shannon.nelson@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent dfe2299e

drivers/dma/ioat.c

+2 −1
Original line number Diff line number Diff line
@@ -34,7 +34,7 @@ 
#include "ioatdma_registers.h"

#include "ioatdma_hw.h"



MODULE_VERSION("1.24");

MODULE_VERSION(IOAT_DMA_VERSION);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Intel Corporation");
@@ -85,6 +85,7 @@ static void ioat_shutdown_functionality(struct pci_dev *pdev) 
{

	struct ioat_device *device = pci_get_drvdata(pdev);



	dev_err(&pdev->dev, "Removing dma and dca services\n");

	if (device->dca) {

		unregister_dca_provider(device->dca);

		free_dca_provider(device->dca);

drivers/dma/ioat_dca.c

+6 −6
Original line number Diff line number Diff line
@@ -65,7 +65,7 @@ static inline u16 dcaid_from_pcidev(struct pci_dev *pci) 
	return (pci->bus->number << 8) | pci->devfn;

}



static int dca_enabled_in_bios(void)

static int dca_enabled_in_bios(struct pci_dev *pdev)

{

	/* CPUID level 9 returns DCA configuration */

	/* Bit 0 indicates DCA enabled by the BIOS */
@@ -75,17 +75,17 @@ static int dca_enabled_in_bios(void) 
	cpuid_level_9 = cpuid_eax(9);

	res = test_bit(0, &cpuid_level_9);

	if (!res)

		printk(KERN_ERR "ioat dma: DCA is disabled in BIOS\n");

		dev_err(&pdev->dev, "DCA is disabled in BIOS\n");



	return res;

}



static int system_has_dca_enabled(void)

static int system_has_dca_enabled(struct pci_dev *pdev)

{

	if (boot_cpu_has(X86_FEATURE_DCA))

		return dca_enabled_in_bios();

		return dca_enabled_in_bios(pdev);



	printk(KERN_ERR "ioat dma: boot cpu doesn't have X86_FEATURE_DCA\n");

	dev_err(&pdev->dev, "boot cpu doesn't have X86_FEATURE_DCA\n");

	return 0;

}
@@ -208,7 +208,7 @@ struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase) 
	int i;

	int err;



	if (!system_has_dca_enabled())

	if (!system_has_dca_enabled(pdev))

		return NULL;



	/* I/OAT v1 systems must have a known tag_map to support DCA */

drivers/dma/ioat_dma.c

+21 −11
Original line number Diff line number Diff line
@@ -267,7 +267,7 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *chan) 
	chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);

	if (chanerr) {

		dev_err(&ioat_chan->device->pdev->dev,

			"ioatdma: CHANERR = %x, clearing\n", chanerr);

			"CHANERR = %x, clearing\n", chanerr);

		writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);

	}
@@ -276,7 +276,7 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *chan) 
		desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_KERNEL);

		if (!desc) {

			dev_err(&ioat_chan->device->pdev->dev,

				"ioatdma: Only %d initial descriptors\n", i);

				"Only %d initial descriptors\n", i);

			break;

		}

		list_add_tail(&desc->node, &tmp_list);
@@ -342,7 +342,7 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan) 
	/* one is ok since we left it on there on purpose */

	if (in_use_descs > 1)

		dev_err(&ioat_chan->device->pdev->dev,

			"ioatdma: Freeing %d in use descriptors!\n",

			"Freeing %d in use descriptors!\n",

			in_use_descs - 1);



	ioat_chan->last_completion = ioat_chan->completion_addr = 0;
@@ -482,7 +482,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) 
	if ((ioat_chan->completion_virt->full & IOAT_CHANSTS_DMA_TRANSFER_STATUS) ==

				IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) {

		dev_err(&ioat_chan->device->pdev->dev,

			"ioatdma: Channel halted, chanerr = %x\n",

			"Channel halted, chanerr = %x\n",

			readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET));



		/* TODO do something to salvage the situation */
@@ -643,7 +643,7 @@ static int ioat_dma_self_test(struct ioatdma_device *device) 
	u8 *src;

	u8 *dest;

	struct dma_chan *dma_chan;

	struct dma_async_tx_descriptor *tx;

	struct dma_async_tx_descriptor *tx = NULL;

	dma_addr_t addr;

	dma_cookie_t cookie;

	int err = 0;
@@ -673,6 +673,13 @@ static int ioat_dma_self_test(struct ioatdma_device *device) 
	}



	tx = ioat_dma_prep_memcpy(dma_chan, IOAT_TEST_SIZE, 0);

	if (!tx) {

		dev_err(&device->pdev->dev,

			"Self-test prep failed, disabling\n");

		err = -ENODEV;

		goto free_resources;

	}



	async_tx_ack(tx);

	addr = dma_map_single(dma_chan->device->dev, src, IOAT_TEST_SIZE,

			DMA_TO_DEVICE);
@@ -686,13 +693,13 @@ static int ioat_dma_self_test(struct ioatdma_device *device) 


	if (ioat_dma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {

		dev_err(&device->pdev->dev,

			"ioatdma: Self-test copy timed out, disabling\n");

			"Self-test copy timed out, disabling\n");

		err = -ENODEV;

		goto free_resources;

	}

	if (memcmp(src, dest, IOAT_TEST_SIZE)) {

		dev_err(&device->pdev->dev,

			"ioatdma: Self-test copy failed compare, disabling\n");

			"Self-test copy failed compare, disabling\n");

		err = -ENODEV;

		goto free_resources;

	}
@@ -730,6 +737,9 @@ static int ioat_dma_setup_interrupts(struct ioatdma_device *device) 
		goto msi;

	if (!strcmp(ioat_interrupt_style, "intx"))

		goto intx;

	dev_err(&device->pdev->dev, "invalid ioat_interrupt_style %s\n",

		ioat_interrupt_style);

	goto err_no_irq;



msix:

	/* The number of MSI-X vectors should equal the number of channels */
@@ -906,9 +916,9 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, 
	device->common.device_dependency_added = ioat_dma_dependency_added;

	device->common.dev = &pdev->dev;

	dev_err(&device->pdev->dev,

		"ioatdma: Intel(R) I/OAT DMA Engine found,"

		" %d channels, device version 0x%02x\n",

		device->common.chancnt, device->version);

		"Intel(R) I/OAT DMA Engine found,"

		" %d channels, device version 0x%02x, driver version %s\n",

		device->common.chancnt, device->version, IOAT_DMA_VERSION);



	err = ioat_dma_setup_interrupts(device);

	if (err)
@@ -932,7 +942,7 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, 
	kfree(device);

err_kzalloc:

	dev_err(&device->pdev->dev,

		"ioatdma: Intel(R) I/OAT DMA Engine initialization failed\n");

		"Intel(R) I/OAT DMA Engine initialization failed\n");

	return NULL;

}

drivers/dma/ioatdma.h

+2 −0
Original line number Diff line number Diff line
@@ -28,6 +28,8 @@ 
#include <linux/cache.h>

#include <linux/pci_ids.h>



#define IOAT_DMA_VERSION "1.26"



enum ioat_interrupt {

	none = 0,

	msix_multi_vector = 1,