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Subject[PATCH 03/29] ioat: convert ioat_probe to pcim/devm
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Date
The driver currently duplicates much of what these routines offer, so
just use the common code. For example ->irq_mode tracks what interrupt
mode was initialized, which duplicates the ->msix_enabled and
->msi_enabled handling in pcim_release.

This also adds a check to the return value of dma_async_device_register,
which can fail.

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/dma/ioat/dma.c | 130 ++++++++++++++++--------------------------------
drivers/dma/ioat/dma.h | 11 ----
drivers/dma/ioat/hw.h | 1
drivers/dma/ioat/pci.c | 67 +++++++++----------------
4 files changed, 68 insertions(+), 141 deletions(-)
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 16c0807..65f8b74 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -121,6 +121,7 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device)
u32 xfercap;
int i;
struct ioat_dma_chan *ioat_chan;
+ struct device *dev = &device->pdev->dev;

/*
* IOAT ver.3 workarounds
@@ -164,7 +165,7 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device)
}
#endif
for (i = 0; i < device->common.chancnt; i++) {
- ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);
+ ioat_chan = devm_kzalloc(dev, sizeof(*ioat_chan), GFP_KERNEL);
if (!ioat_chan) {
device->common.chancnt = i;
break;
@@ -1450,7 +1451,11 @@ MODULE_PARM_DESC(ioat_interrupt_style,
static int ioat_dma_setup_interrupts(struct ioatdma_device *device)
{
struct ioat_dma_chan *ioat_chan;
- int err, i, j, msixcnt;
+ struct pci_dev *pdev = device->pdev;
+ struct device *dev = &pdev->dev;
+ struct msix_entry *msix;
+ int i, j, msixcnt;
+ int err = -EINVAL;
u8 intrctrl = 0;

if (!strcmp(ioat_interrupt_style, "msix"))
@@ -1461,8 +1466,7 @@ 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);
+ dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style);
goto err_no_irq;

msix:
@@ -1471,55 +1475,55 @@ msix:
for (i = 0; i < msixcnt; i++)
device->msix_entries[i].entry = i;

- err = pci_enable_msix(device->pdev, device->msix_entries, msixcnt);
+ err = pci_enable_msix(pdev, device->msix_entries, msixcnt);
if (err < 0)
goto msi;
if (err > 0)
goto msix_single_vector;

for (i = 0; i < msixcnt; i++) {
+ msix = &device->msix_entries[i];
ioat_chan = ioat_lookup_chan_by_index(device, i);
- err = request_irq(device->msix_entries[i].vector,
- ioat_dma_do_interrupt_msix,
- 0, "ioat-msix", ioat_chan);
+ err = devm_request_irq(dev, msix->vector,
+ ioat_dma_do_interrupt_msix, 0,
+ "ioat-msix", ioat_chan);
if (err) {
for (j = 0; j < i; j++) {
+ msix = &device->msix_entries[j];
ioat_chan =
ioat_lookup_chan_by_index(device, j);
- free_irq(device->msix_entries[j].vector,
- ioat_chan);
+ devm_free_irq(dev, msix->vector, ioat_chan);
}
goto msix_single_vector;
}
}
intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
- device->irq_mode = msix_multi_vector;
goto done;

msix_single_vector:
- device->msix_entries[0].entry = 0;
- err = pci_enable_msix(device->pdev, device->msix_entries, 1);
+ msix = &device->msix_entries[0];
+ msix->entry = 0;
+ err = pci_enable_msix(pdev, device->msix_entries, 1);
if (err)
goto msi;

- err = request_irq(device->msix_entries[0].vector, ioat_dma_do_interrupt,
- 0, "ioat-msix", device);
+ err = devm_request_irq(dev, msix->vector, ioat_dma_do_interrupt, 0,
+ "ioat-msix", device);
if (err) {
- pci_disable_msix(device->pdev);
+ pci_disable_msix(pdev);
goto msi;
}
- device->irq_mode = msix_single_vector;
goto done;

msi:
- err = pci_enable_msi(device->pdev);
+ err = pci_enable_msi(pdev);
if (err)
goto intx;

- err = request_irq(device->pdev->irq, ioat_dma_do_interrupt,
- 0, "ioat-msi", device);
+ err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0,
+ "ioat-msi", device);
if (err) {
- pci_disable_msi(device->pdev);
+ pci_disable_msi(pdev);
goto intx;
}
/*
@@ -1527,21 +1531,17 @@ msi:
*/
if (device->version == IOAT_VER_1_2) {
u32 dmactrl;
- pci_read_config_dword(device->pdev,
- IOAT_PCI_DMACTRL_OFFSET, &dmactrl);
+ pci_read_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, &dmactrl);
dmactrl |= IOAT_PCI_DMACTRL_MSI_EN;
- pci_write_config_dword(device->pdev,
- IOAT_PCI_DMACTRL_OFFSET, dmactrl);
+ pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl);
}
- device->irq_mode = msi;
goto done;

intx:
- err = request_irq(device->pdev->irq, ioat_dma_do_interrupt,
- IRQF_SHARED, "ioat-intx", device);
+ err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt,
+ IRQF_SHARED, "ioat-intx", device);
if (err)
goto err_no_irq;
- device->irq_mode = intx;

done:
intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN;
@@ -1551,60 +1551,26 @@ done:
err_no_irq:
/* Disable all interrupt generation */
writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET);
- dev_err(&device->pdev->dev, "no usable interrupts\n");
- device->irq_mode = none;
- return -1;
+ dev_err(dev, "no usable interrupts\n");
+ return err;
}

-/**
- * ioat_dma_remove_interrupts - remove whatever interrupts were set
- * @device: ioat device
- */
-static void ioat_dma_remove_interrupts(struct ioatdma_device *device)
+static void ioat_disable_interrupts(struct ioatdma_device *device)
{
- struct ioat_dma_chan *ioat_chan;
- int i;
-
/* Disable all interrupt generation */
writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET);
-
- switch (device->irq_mode) {
- case msix_multi_vector:
- for (i = 0; i < device->common.chancnt; i++) {
- ioat_chan = ioat_lookup_chan_by_index(device, i);
- free_irq(device->msix_entries[i].vector, ioat_chan);
- }
- pci_disable_msix(device->pdev);
- break;
- case msix_single_vector:
- free_irq(device->msix_entries[0].vector, device);
- pci_disable_msix(device->pdev);
- break;
- case msi:
- free_irq(device->pdev->irq, device);
- pci_disable_msi(device->pdev);
- break;
- case intx:
- free_irq(device->pdev->irq, device);
- break;
- case none:
- dev_warn(&device->pdev->dev,
- "call to %s without interrupts setup\n", __func__);
- }
- device->irq_mode = none;
}

struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
void __iomem *iobase)
{
int err;
+ struct device *dev = &pdev->dev;
struct ioatdma_device *device;

- device = kzalloc(sizeof(*device), GFP_KERNEL);
- if (!device) {
+ device = devm_kzalloc(dev, 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);
@@ -1651,14 +1617,12 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
break;
}

- dev_err(&device->pdev->dev,
- "Intel(R) I/OAT DMA Engine found,"
+ dev_err(dev, "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);

if (!device->common.chancnt) {
- dev_err(&device->pdev->dev,
- "Intel(R) I/OAT DMA Engine problem found: "
+ dev_err(dev, "Intel(R) I/OAT DMA Engine problem found: "
"zero channels detected\n");
goto err_setup_interrupts;
}
@@ -1671,9 +1635,11 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
if (err)
goto err_self_test;

- ioat_set_tcp_copy_break(device);
+ err = dma_async_device_register(&device->common);
+ if (err)
+ goto err_self_test;

- dma_async_device_register(&device->common);
+ ioat_set_tcp_copy_break(device);

if (device->version != IOAT_VER_3_0) {
INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog);
@@ -1684,16 +1650,12 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
return device;

err_self_test:
- ioat_dma_remove_interrupts(device);
+ ioat_disable_interrupts(device);
err_setup_interrupts:
pci_pool_destroy(device->completion_pool);
err_completion_pool:
pci_pool_destroy(device->dma_pool);
err_dma_pool:
- kfree(device);
-err_kzalloc:
- dev_err(&pdev->dev,
- "Intel(R) I/OAT DMA Engine initialization failed\n");
return NULL;
}

@@ -1705,23 +1667,17 @@ void ioat_dma_remove(struct ioatdma_device *device)
if (device->version != IOAT_VER_3_0)
cancel_delayed_work(&device->work);

- ioat_dma_remove_interrupts(device);
+ ioat_disable_interrupts(device);

dma_async_device_unregister(&device->common);

pci_pool_destroy(device->dma_pool);
pci_pool_destroy(device->completion_pool);

- iounmap(device->reg_base);
- pci_release_regions(device->pdev);
- pci_disable_device(device->pdev);
-
list_for_each_entry_safe(chan, _chan,
&device->common.channels, device_node) {
ioat_chan = to_ioat_chan(chan);
list_del(&chan->device_node);
- kfree(ioat_chan);
}
- kfree(device);
}

diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index ccb400f..5e8d7cf 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -31,14 +31,6 @@

#define IOAT_DMA_VERSION "3.64"

-enum ioat_interrupt {
- none = 0,
- msix_multi_vector = 1,
- msix_single_vector = 2,
- msi = 3,
- intx = 4,
-};
-
#define IOAT_LOW_COMPLETION_MASK 0xffffffc0
#define IOAT_DMA_DCA_ANY_CPU ~0
#define IOAT_WATCHDOG_PERIOD (2 * HZ)
@@ -59,7 +51,6 @@ enum ioat_interrupt {
*/
#define NULL_DESC_BUFFER_SIZE 1

-
/**
* struct ioatdma_device - internal representation of a IOAT device
* @pdev: PCI-Express device
@@ -67,7 +58,6 @@ enum ioat_interrupt {
* @dma_pool: for allocating DMA descriptors
* @common: embedded struct dma_device
* @version: version of ioatdma device
- * @irq_mode: which style irq to use
* @msix_entries: irq handlers
* @idx: per channel data
*/
@@ -79,7 +69,6 @@ struct ioatdma_device {
struct pci_pool *completion_pool;
struct dma_device common;
u8 version;
- enum ioat_interrupt irq_mode;
struct delayed_work work;
struct msix_entry msix_entries[4];
struct ioat_dma_chan *idx[4];
diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h
index afa57ee..1438fa5 100644
--- a/drivers/dma/ioat/hw.h
+++ b/drivers/dma/ioat/hw.h
@@ -23,6 +23,7 @@

/* PCI Configuration Space Values */
#define IOAT_PCI_VID 0x8086
+#define IOAT_MMIO_BAR 0

/* CB device ID's */
#define IOAT_PCI_DID_5000 0x1A38
diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c
index d7948bf..982e38f 100644
--- a/drivers/dma/ioat/pci.c
+++ b/drivers/dma/ioat/pci.c
@@ -62,7 +62,6 @@ static struct pci_device_id ioat_pci_tbl[] = {

struct ioat_device {
struct pci_dev *pdev;
- void __iomem *iobase;
struct ioatdma_device *dma;
struct dca_provider *dca;
};
@@ -75,8 +74,10 @@ 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)");

+#define DRV_NAME "ioatdma"
+
static struct pci_driver ioat_pci_driver = {
- .name = "ioatdma",
+ .name = DRV_NAME,
.id_table = ioat_pci_tbl,
.probe = ioat_probe,
.remove = __devexit_p(ioat_remove),
@@ -85,47 +86,42 @@ static struct pci_driver ioat_pci_driver = {
static int __devinit ioat_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
+ void __iomem * const *iomap;
void __iomem *iobase;
+ struct device *dev = &pdev->dev;
struct ioat_device *device;
- unsigned long mmio_start, mmio_len;
int err;

- err = pci_enable_device(pdev);
+ err = pcim_enable_device(pdev);
if (err)
- goto err_enable_device;
+ return err;

- err = pci_request_regions(pdev, ioat_pci_driver.name);
+ err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
if (err)
- goto err_request_regions;
+ return err;
+ iomap = pcim_iomap_table(pdev);
+ if (!iomap)
+ return -ENOMEM;

err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
if (err)
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (err)
- goto err_set_dma_mask;
+ return err;

err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
if (err)
err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (err)
- goto err_set_dma_mask;
-
- mmio_start = pci_resource_start(pdev, 0);
- mmio_len = pci_resource_len(pdev, 0);
- iobase = ioremap(mmio_start, mmio_len);
- if (!iobase) {
- err = -ENOMEM;
- goto err_ioremap;
- }
+ return err;
+
+ device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL);
+ if (!device)
+ return -ENOMEM;

- device = kzalloc(sizeof(*device), GFP_KERNEL);
- if (!device) {
- err = -ENOMEM;
- goto err_kzalloc;
- }
device->pdev = pdev;
pci_set_drvdata(pdev, device);
- device->iobase = iobase;
+ iobase = iomap[IOAT_MMIO_BAR];

pci_set_master(pdev);

@@ -146,28 +142,15 @@ static int __devinit ioat_probe(struct pci_dev *pdev,
device->dca = ioat3_dca_init(pdev, iobase);
break;
default:
- err = -ENODEV;
- break;
+ return -ENODEV;
}
- if (!device->dma)
- err = -ENODEV;

- if (err)
- goto err_version;
+ if (!device->dma) {
+ dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
+ return -ENODEV;
+ }

return 0;
-
-err_version:
- kfree(device);
-err_kzalloc:
- iounmap(iobase);
-err_ioremap:
-err_set_dma_mask:
- pci_release_regions(pdev);
- pci_disable_device(pdev);
-err_request_regions:
-err_enable_device:
- return err;
}

static void __devexit ioat_remove(struct pci_dev *pdev)
@@ -185,8 +168,6 @@ static void __devexit ioat_remove(struct pci_dev *pdev)
ioat_dma_remove(device->dma);
device->dma = NULL;
}
-
- kfree(device);
}

static int __init ioat_init_module(void)


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