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i7300_idle: Disable ioat channel only on platforms where ile driver can load

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Based on input from Andi Kleen:
share the platform detection code with ioat_dma and disable the channel in
dma engine only for specific platforms.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Venki Pallipadi 2008-10-22 16:34:52 -07:00 committed by Len Brown
parent 27471fdb32
commit 3ad0b02e4c
3 changed files with 89 additions and 71 deletions
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5
drivers/dma/ioat_dma.c
View File

@ -33,6 +33,7 @@
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/workqueue.h>
#include <linux/i7300_idle.h>
#include "ioatdma.h"
#include "ioatdma_registers.h"
#include "ioatdma_hw.h"
@ -172,7 +173,9 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device)
xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale));
#if CONFIG_I7300_IDLE_IOAT_CHANNEL
device->common.chancnt--;
if (i7300_idle_platform_probe(NULL, NULL) == 0) {
device->common.chancnt--;
}
#endif
for (i = 0; i < device->common.chancnt; i++) {
ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);

72
drivers/idle/i7300_idle.c
View File

@ -25,6 +25,7 @@
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/stop_machine.h>
#include <linux/i7300_idle.h>
#include <asm/idle.h>
@ -505,77 +506,8 @@ static struct notifier_block i7300_idle_nb = {
.notifier_call = i7300_idle_notifier,
};
/*
* I/O AT controls (PCI bus 0 device 8 function 0)
* DIMM controls (PCI bus 0 device 16 function 1)
*/
#define IOAT_BUS 0
#define IOAT_DEVFN PCI_DEVFN(8, 0)
#define MEMCTL_BUS 0
#define MEMCTL_DEVFN PCI_DEVFN(16, 1)
struct fbd_ioat {
unsigned int vendor;
unsigned int ioat_dev;
};
/*
* The i5000 chip-set has the same hooks as the i7300
* but support is disabled by default because this driver
* has not been validated on that platform.
*/
#define SUPPORT_I5000 0
static const struct fbd_ioat fbd_ioat_list[] = {
{PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB},
#if SUPPORT_I5000
{PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT},
#endif
{0, 0}
};
/* table of devices that work with this driver */
static const struct pci_device_id pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_FBD_CNB) },
#if SUPPORT_I5000
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
#endif
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, pci_tbl);
/* Check for known platforms with I/O-AT */
static int __init i7300_idle_platform_probe(void)
{
int i;
fbd_dev = pci_get_bus_and_slot(MEMCTL_BUS, MEMCTL_DEVFN);
if (!fbd_dev)
return -ENODEV;
for (i = 0; pci_tbl[i].vendor != 0; i++) {
if (fbd_dev->vendor == pci_tbl[i].vendor &&
fbd_dev->device == pci_tbl[i].device) {
break;
}
}
if (pci_tbl[i].vendor == 0)
return -ENODEV;
ioat_dev = pci_get_bus_and_slot(IOAT_BUS, IOAT_DEVFN);
if (!ioat_dev)
return -ENODEV;
for (i = 0; fbd_ioat_list[i].vendor != 0; i++) {
if (ioat_dev->vendor == fbd_ioat_list[i].vendor &&
ioat_dev->device == fbd_ioat_list[i].ioat_dev) {
return 0;
}
}
return -ENODEV;
}
int stats_open_generic(struct inode *inode, struct file *fp)
{
fp->private_data = inode->i_private;
@ -617,7 +549,7 @@ static int __init i7300_idle_init(void)
cpus_clear(idle_cpumask);
total_us = 0;
if (i7300_idle_platform_probe())
if (i7300_idle_platform_probe(&fbd_dev, &ioat_dev))
return -ENODEV;
if (i7300_idle_thrt_save())

83
include/linux/i7300_idle.h Normal file
View File

@ -0,0 +1,83 @@
#ifndef I7300_IDLE_H
#define I7300_IDLE_H
#include <linux/pci.h>
/*
* I/O AT controls (PCI bus 0 device 8 function 0)
* DIMM controls (PCI bus 0 device 16 function 1)
*/
#define IOAT_BUS 0
#define IOAT_DEVFN PCI_DEVFN(8, 0)
#define MEMCTL_BUS 0
#define MEMCTL_DEVFN PCI_DEVFN(16, 1)
struct fbd_ioat {
unsigned int vendor;
unsigned int ioat_dev;
};
/*
* The i5000 chip-set has the same hooks as the i7300
* but support is disabled by default because this driver
* has not been validated on that platform.
*/
#define SUPPORT_I5000 0
static const struct fbd_ioat fbd_ioat_list[] = {
{PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB},
#if SUPPORT_I5000
{PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT},
#endif
{0, 0}
};
/* table of devices that work with this driver */
static const struct pci_device_id pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_FBD_CNB) },
#if SUPPORT_I5000
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
#endif
{ } /* Terminating entry */
};
/* Check for known platforms with I/O-AT */
static inline int i7300_idle_platform_probe(struct pci_dev **fbd_dev,
struct pci_dev **ioat_dev)
{
int i;
struct pci_dev *memdev, *dmadev;
memdev = pci_get_bus_and_slot(MEMCTL_BUS, MEMCTL_DEVFN);
if (!memdev)
return -ENODEV;
for (i = 0; pci_tbl[i].vendor != 0; i++) {
if (memdev->vendor == pci_tbl[i].vendor &&
memdev->device == pci_tbl[i].device) {
break;
}
}
if (pci_tbl[i].vendor == 0)
return -ENODEV;
dmadev = pci_get_bus_and_slot(IOAT_BUS, IOAT_DEVFN);
if (!dmadev)
return -ENODEV;
for (i = 0; fbd_ioat_list[i].vendor != 0; i++) {
if (dmadev->vendor == fbd_ioat_list[i].vendor &&
dmadev->device == fbd_ioat_list[i].ioat_dev) {
if (fbd_dev)
*fbd_dev = memdev;
if (ioat_dev)
*ioat_dev = dmadev;
return 0;
}
}
return -ENODEV;
}
#endif