2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* File: msi.c
|
|
|
|
* Purpose: PCI Message Signaled Interrupt (MSI)
|
|
|
|
*
|
|
|
|
* Copyright (C) 2003-2004 Intel
|
|
|
|
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
|
|
|
|
*/
|
|
|
|
|
2006-10-04 11:16:41 +02:00
|
|
|
#include <linux/err.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
#include <linux/mm.h>
|
|
|
|
#include <linux/irq.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/ioport.h>
|
|
|
|
#include <linux/pci.h>
|
|
|
|
#include <linux/proc_fs.h>
|
2006-10-04 11:16:59 +02:00
|
|
|
#include <linux/msi.h>
|
2007-04-27 03:21:38 +02:00
|
|
|
#include <linux/smp.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
#include <asm/errno.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
|
|
|
|
#include "pci.h"
|
|
|
|
#include "msi.h"
|
|
|
|
|
|
|
|
static int pci_msi_enable = 1;
|
|
|
|
|
2007-12-11 23:19:41 +01:00
|
|
|
/* Arch hooks */
|
|
|
|
|
2009-01-19 01:31:00 +01:00
|
|
|
#ifndef arch_msi_check_device
|
|
|
|
int arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
|
2007-12-11 23:19:41 +01:00
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
2009-01-19 01:31:00 +01:00
|
|
|
#endif
|
2007-12-11 23:19:41 +01:00
|
|
|
|
2009-01-19 01:31:00 +01:00
|
|
|
#ifndef arch_setup_msi_irqs
|
|
|
|
int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
|
2007-12-11 23:19:41 +01:00
|
|
|
{
|
|
|
|
struct msi_desc *entry;
|
|
|
|
int ret;
|
|
|
|
|
2009-03-17 13:54:10 +01:00
|
|
|
/*
|
|
|
|
* If an architecture wants to support multiple MSI, it needs to
|
|
|
|
* override arch_setup_msi_irqs()
|
|
|
|
*/
|
|
|
|
if (type == PCI_CAP_ID_MSI && nvec > 1)
|
|
|
|
return 1;
|
|
|
|
|
2007-12-11 23:19:41 +01:00
|
|
|
list_for_each_entry(entry, &dev->msi_list, list) {
|
|
|
|
ret = arch_setup_msi_irq(dev, entry);
|
2009-02-11 12:27:02 +01:00
|
|
|
if (ret < 0)
|
2007-12-11 23:19:41 +01:00
|
|
|
return ret;
|
2009-02-11 12:27:02 +01:00
|
|
|
if (ret > 0)
|
|
|
|
return -ENOSPC;
|
2007-12-11 23:19:41 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2009-01-19 01:31:00 +01:00
|
|
|
#endif
|
2007-12-11 23:19:41 +01:00
|
|
|
|
2009-01-19 01:31:00 +01:00
|
|
|
#ifndef arch_teardown_msi_irqs
|
|
|
|
void arch_teardown_msi_irqs(struct pci_dev *dev)
|
2007-12-11 23:19:41 +01:00
|
|
|
{
|
|
|
|
struct msi_desc *entry;
|
|
|
|
|
|
|
|
list_for_each_entry(entry, &dev->msi_list, list) {
|
2009-03-17 13:54:10 +01:00
|
|
|
int i, nvec;
|
|
|
|
if (entry->irq == 0)
|
|
|
|
continue;
|
|
|
|
nvec = 1 << entry->msi_attrib.multiple;
|
|
|
|
for (i = 0; i < nvec; i++)
|
|
|
|
arch_teardown_msi_irq(entry->irq + i);
|
2007-12-11 23:19:41 +01:00
|
|
|
}
|
|
|
|
}
|
2009-01-19 01:31:00 +01:00
|
|
|
#endif
|
2007-12-11 23:19:41 +01:00
|
|
|
|
2009-06-16 14:31:45 +02:00
|
|
|
static void msi_set_enable(struct pci_dev *dev, int pos, int enable)
|
2007-03-05 09:30:10 +01:00
|
|
|
{
|
|
|
|
u16 control;
|
|
|
|
|
2009-06-16 14:31:45 +02:00
|
|
|
BUG_ON(!pos);
|
2007-03-05 09:30:10 +01:00
|
|
|
|
2009-06-16 14:31:45 +02:00
|
|
|
pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
|
|
|
|
control &= ~PCI_MSI_FLAGS_ENABLE;
|
|
|
|
if (enable)
|
|
|
|
control |= PCI_MSI_FLAGS_ENABLE;
|
|
|
|
pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
|
2008-05-19 06:48:17 +02:00
|
|
|
}
|
|
|
|
|
2007-03-05 09:30:10 +01:00
|
|
|
static void msix_set_enable(struct pci_dev *dev, int enable)
|
|
|
|
{
|
|
|
|
int pos;
|
|
|
|
u16 control;
|
|
|
|
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
|
|
if (pos) {
|
|
|
|
pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
|
|
|
|
control &= ~PCI_MSIX_FLAGS_ENABLE;
|
|
|
|
if (enable)
|
|
|
|
control |= PCI_MSIX_FLAGS_ENABLE;
|
|
|
|
pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-01-22 01:19:19 +01:00
|
|
|
static inline __attribute_const__ u32 msi_mask(unsigned x)
|
|
|
|
{
|
2009-02-09 04:27:47 +01:00
|
|
|
/* Don't shift by >= width of type */
|
|
|
|
if (x >= 5)
|
|
|
|
return 0xffffffff;
|
|
|
|
return (1 << (1 << x)) - 1;
|
2009-01-22 01:19:19 +01:00
|
|
|
}
|
|
|
|
|
2009-03-17 13:54:09 +01:00
|
|
|
static inline __attribute_const__ u32 msi_capable_mask(u16 control)
|
2007-03-30 20:54:08 +02:00
|
|
|
{
|
2009-03-17 13:54:09 +01:00
|
|
|
return msi_mask((control >> 1) & 7);
|
|
|
|
}
|
2007-03-30 20:54:08 +02:00
|
|
|
|
2009-03-17 13:54:09 +01:00
|
|
|
static inline __attribute_const__ u32 msi_enabled_mask(u16 control)
|
|
|
|
{
|
|
|
|
return msi_mask((control >> 4) & 7);
|
2007-03-30 20:54:08 +02:00
|
|
|
}
|
|
|
|
|
2008-07-25 23:42:58 +02:00
|
|
|
/*
|
|
|
|
* PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
|
|
|
|
* mask all MSI interrupts by clearing the MSI enable bit does not work
|
|
|
|
* reliably as devices without an INTx disable bit will then generate a
|
|
|
|
* level IRQ which will never be cleared.
|
|
|
|
*/
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
static u32 __msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2009-03-17 13:54:09 +01:00
|
|
|
u32 mask_bits = desc->masked;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-03-17 13:54:09 +01:00
|
|
|
if (!desc->msi_attrib.maskbit)
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
return 0;
|
2009-03-17 13:54:09 +01:00
|
|
|
|
|
|
|
mask_bits &= ~mask;
|
|
|
|
mask_bits |= flag;
|
|
|
|
pci_write_config_dword(desc->dev, desc->mask_pos, mask_bits);
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
|
|
|
|
return mask_bits;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
|
|
|
|
{
|
|
|
|
desc->masked = __msi_mask_irq(desc, mask, flag);
|
2009-03-17 13:54:09 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This internal function does not flush PCI writes to the device.
|
|
|
|
* All users must ensure that they read from the device before either
|
|
|
|
* assuming that the device state is up to date, or returning out of this
|
|
|
|
* file. This saves a few milliseconds when initialising devices with lots
|
|
|
|
* of MSI-X interrupts.
|
|
|
|
*/
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
static u32 __msix_mask_irq(struct msi_desc *desc, u32 flag)
|
2009-03-17 13:54:09 +01:00
|
|
|
{
|
|
|
|
u32 mask_bits = desc->masked;
|
|
|
|
unsigned offset = desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
|
2009-06-23 10:40:04 +02:00
|
|
|
PCI_MSIX_ENTRY_VECTOR_CTRL;
|
2009-03-17 13:54:09 +01:00
|
|
|
mask_bits &= ~1;
|
|
|
|
mask_bits |= flag;
|
|
|
|
writel(mask_bits, desc->mask_base + offset);
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
|
|
|
|
return mask_bits;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void msix_mask_irq(struct msi_desc *desc, u32 flag)
|
|
|
|
{
|
|
|
|
desc->masked = __msix_mask_irq(desc, flag);
|
2009-03-17 13:54:09 +01:00
|
|
|
}
|
2009-03-17 13:54:06 +01:00
|
|
|
|
2009-03-17 13:54:09 +01:00
|
|
|
static void msi_set_mask_bit(unsigned irq, u32 flag)
|
|
|
|
{
|
|
|
|
struct msi_desc *desc = get_irq_msi(irq);
|
2009-03-17 13:54:06 +01:00
|
|
|
|
2009-03-17 13:54:09 +01:00
|
|
|
if (desc->msi_attrib.is_msix) {
|
|
|
|
msix_mask_irq(desc, flag);
|
|
|
|
readl(desc->mask_base); /* Flush write to device */
|
|
|
|
} else {
|
2009-03-17 13:54:10 +01:00
|
|
|
unsigned offset = irq - desc->dev->irq;
|
|
|
|
msi_mask_irq(desc, 1 << offset, flag << offset);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2009-03-17 13:54:09 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
void mask_msi_irq(unsigned int irq)
|
|
|
|
{
|
|
|
|
msi_set_mask_bit(irq, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
void unmask_msi_irq(unsigned int irq)
|
|
|
|
{
|
|
|
|
msi_set_mask_bit(irq, 0);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2008-12-06 03:58:34 +01:00
|
|
|
void read_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2008-12-06 03:58:34 +01:00
|
|
|
struct msi_desc *entry = get_irq_desc_msi(desc);
|
2009-03-17 13:54:06 +01:00
|
|
|
if (entry->msi_attrib.is_msix) {
|
|
|
|
void __iomem *base = entry->mask_base +
|
|
|
|
entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
|
|
|
|
|
2009-06-23 10:40:04 +02:00
|
|
|
msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR);
|
|
|
|
msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR);
|
|
|
|
msg->data = readl(base + PCI_MSIX_ENTRY_DATA);
|
2009-03-17 13:54:06 +01:00
|
|
|
} else {
|
2006-10-04 11:16:33 +02:00
|
|
|
struct pci_dev *dev = entry->dev;
|
|
|
|
int pos = entry->msi_attrib.pos;
|
|
|
|
u16 data;
|
|
|
|
|
|
|
|
pci_read_config_dword(dev, msi_lower_address_reg(pos),
|
|
|
|
&msg->address_lo);
|
|
|
|
if (entry->msi_attrib.is_64) {
|
|
|
|
pci_read_config_dword(dev, msi_upper_address_reg(pos),
|
|
|
|
&msg->address_hi);
|
|
|
|
pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
|
|
|
|
} else {
|
|
|
|
msg->address_hi = 0;
|
2007-10-03 20:15:11 +02:00
|
|
|
pci_read_config_word(dev, msi_data_reg(pos, 0), &data);
|
2006-10-04 11:16:33 +02:00
|
|
|
}
|
|
|
|
msg->data = data;
|
|
|
|
}
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2008-12-06 03:58:34 +01:00
|
|
|
void read_msi_msg(unsigned int irq, struct msi_msg *msg)
|
2006-10-04 11:16:33 +02:00
|
|
|
{
|
2008-12-06 03:58:34 +01:00
|
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
|
|
|
|
|
|
read_msi_msg_desc(desc, msg);
|
|
|
|
}
|
|
|
|
|
|
|
|
void write_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg)
|
|
|
|
{
|
|
|
|
struct msi_desc *entry = get_irq_desc_msi(desc);
|
2009-03-17 13:54:06 +01:00
|
|
|
if (entry->msi_attrib.is_msix) {
|
|
|
|
void __iomem *base;
|
|
|
|
base = entry->mask_base +
|
|
|
|
entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
|
|
|
|
|
2009-06-23 10:40:04 +02:00
|
|
|
writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
|
|
|
|
writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
|
|
|
|
writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
|
2009-03-17 13:54:06 +01:00
|
|
|
} else {
|
2006-10-04 11:16:33 +02:00
|
|
|
struct pci_dev *dev = entry->dev;
|
|
|
|
int pos = entry->msi_attrib.pos;
|
2009-03-17 13:54:10 +01:00
|
|
|
u16 msgctl;
|
|
|
|
|
|
|
|
pci_read_config_word(dev, msi_control_reg(pos), &msgctl);
|
|
|
|
msgctl &= ~PCI_MSI_FLAGS_QSIZE;
|
|
|
|
msgctl |= entry->msi_attrib.multiple << 4;
|
|
|
|
pci_write_config_word(dev, msi_control_reg(pos), msgctl);
|
2006-10-04 11:16:33 +02:00
|
|
|
|
|
|
|
pci_write_config_dword(dev, msi_lower_address_reg(pos),
|
|
|
|
msg->address_lo);
|
|
|
|
if (entry->msi_attrib.is_64) {
|
|
|
|
pci_write_config_dword(dev, msi_upper_address_reg(pos),
|
|
|
|
msg->address_hi);
|
|
|
|
pci_write_config_word(dev, msi_data_reg(pos, 1),
|
|
|
|
msg->data);
|
|
|
|
} else {
|
|
|
|
pci_write_config_word(dev, msi_data_reg(pos, 0),
|
|
|
|
msg->data);
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2007-03-08 21:04:57 +01:00
|
|
|
entry->msg = *msg;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2006-10-04 11:16:33 +02:00
|
|
|
|
2008-12-06 03:58:34 +01:00
|
|
|
void write_msi_msg(unsigned int irq, struct msi_msg *msg)
|
|
|
|
{
|
|
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
|
|
|
|
|
|
write_msi_msg_desc(desc, msg);
|
|
|
|
}
|
|
|
|
|
2007-04-18 11:39:22 +02:00
|
|
|
static int msi_free_irqs(struct pci_dev* dev);
|
2007-01-18 05:50:05 +01:00
|
|
|
|
2009-03-17 13:54:07 +01:00
|
|
|
static struct msi_desc *alloc_msi_entry(struct pci_dev *dev)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2009-03-17 13:54:07 +01:00
|
|
|
struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
|
|
|
|
if (!desc)
|
2005-04-17 00:20:36 +02:00
|
|
|
return NULL;
|
|
|
|
|
2009-03-17 13:54:07 +01:00
|
|
|
INIT_LIST_HEAD(&desc->list);
|
|
|
|
desc->dev = dev;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-03-17 13:54:07 +01:00
|
|
|
return desc;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2007-10-25 10:16:30 +02:00
|
|
|
static void pci_intx_for_msi(struct pci_dev *dev, int enable)
|
|
|
|
{
|
|
|
|
if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG))
|
|
|
|
pci_intx(dev, enable);
|
|
|
|
}
|
|
|
|
|
2007-01-25 09:34:08 +01:00
|
|
|
static void __pci_restore_msi_state(struct pci_dev *dev)
|
2006-02-08 10:11:38 +01:00
|
|
|
{
|
2007-03-08 21:04:57 +01:00
|
|
|
int pos;
|
2006-02-08 10:11:38 +01:00
|
|
|
u16 control;
|
2007-03-08 21:04:57 +01:00
|
|
|
struct msi_desc *entry;
|
2006-02-08 10:11:38 +01:00
|
|
|
|
2007-03-05 09:30:10 +01:00
|
|
|
if (!dev->msi_enabled)
|
|
|
|
return;
|
|
|
|
|
2007-03-08 21:04:57 +01:00
|
|
|
entry = get_irq_msi(dev->irq);
|
|
|
|
pos = entry->msi_attrib.pos;
|
2006-02-08 10:11:38 +01:00
|
|
|
|
2007-10-25 10:16:30 +02:00
|
|
|
pci_intx_for_msi(dev, 0);
|
2009-06-16 14:31:45 +02:00
|
|
|
msi_set_enable(dev, pos, 0);
|
2007-03-08 21:04:57 +01:00
|
|
|
write_msi_msg(dev->irq, &entry->msg);
|
|
|
|
|
|
|
|
pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
|
2009-03-17 13:54:09 +01:00
|
|
|
msi_mask_irq(entry, msi_capable_mask(control), entry->masked);
|
2008-08-07 17:52:37 +02:00
|
|
|
control &= ~PCI_MSI_FLAGS_QSIZE;
|
2009-03-17 13:54:10 +01:00
|
|
|
control |= (entry->msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE;
|
2006-02-08 10:11:38 +01:00
|
|
|
pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
|
2007-01-25 09:34:08 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __pci_restore_msix_state(struct pci_dev *dev)
|
2006-02-08 10:11:38 +01:00
|
|
|
{
|
|
|
|
int pos;
|
|
|
|
struct msi_desc *entry;
|
2007-03-08 21:04:57 +01:00
|
|
|
u16 control;
|
2006-02-08 10:11:38 +01:00
|
|
|
|
2007-01-28 20:42:52 +01:00
|
|
|
if (!dev->msix_enabled)
|
|
|
|
return;
|
2009-06-19 04:15:59 +02:00
|
|
|
BUG_ON(list_empty(&dev->msi_list));
|
|
|
|
entry = list_entry(dev->msi_list.next, struct msi_desc, list);
|
|
|
|
pos = entry->msi_attrib.pos;
|
|
|
|
pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
|
2007-01-28 20:42:52 +01:00
|
|
|
|
2006-02-08 10:11:38 +01:00
|
|
|
/* route the table */
|
2007-10-25 10:16:30 +02:00
|
|
|
pci_intx_for_msi(dev, 0);
|
2009-06-19 04:15:59 +02:00
|
|
|
control |= PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL;
|
|
|
|
pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
|
2006-02-08 10:11:38 +01:00
|
|
|
|
2007-04-05 09:19:10 +02:00
|
|
|
list_for_each_entry(entry, &dev->msi_list, list) {
|
|
|
|
write_msi_msg(entry->irq, &entry->msg);
|
2009-03-17 13:54:09 +01:00
|
|
|
msix_mask_irq(entry, entry->masked);
|
2006-02-08 10:11:38 +01:00
|
|
|
}
|
|
|
|
|
2007-03-08 21:04:57 +01:00
|
|
|
control &= ~PCI_MSIX_FLAGS_MASKALL;
|
|
|
|
pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
|
2006-02-08 10:11:38 +01:00
|
|
|
}
|
2007-01-25 09:34:08 +01:00
|
|
|
|
|
|
|
void pci_restore_msi_state(struct pci_dev *dev)
|
|
|
|
{
|
|
|
|
__pci_restore_msi_state(dev);
|
|
|
|
__pci_restore_msix_state(dev);
|
|
|
|
}
|
2007-11-07 22:43:59 +01:00
|
|
|
EXPORT_SYMBOL_GPL(pci_restore_msi_state);
|
2006-02-08 10:11:38 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/**
|
|
|
|
* msi_capability_init - configure device's MSI capability structure
|
|
|
|
* @dev: pointer to the pci_dev data structure of MSI device function
|
2009-03-17 13:54:10 +01:00
|
|
|
* @nvec: number of interrupts to allocate
|
2005-04-17 00:20:36 +02:00
|
|
|
*
|
2009-03-17 13:54:10 +01:00
|
|
|
* Setup the MSI capability structure of the device with the requested
|
|
|
|
* number of interrupts. A return value of zero indicates the successful
|
|
|
|
* setup of an entry with the new MSI irq. A negative return value indicates
|
|
|
|
* an error, and a positive return value indicates the number of interrupts
|
|
|
|
* which could have been allocated.
|
|
|
|
*/
|
|
|
|
static int msi_capability_init(struct pci_dev *dev, int nvec)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct msi_desc *entry;
|
2007-04-18 11:39:21 +02:00
|
|
|
int pos, ret;
|
2005-04-17 00:20:36 +02:00
|
|
|
u16 control;
|
2009-03-17 13:54:09 +01:00
|
|
|
unsigned mask;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
2009-06-16 14:31:45 +02:00
|
|
|
msi_set_enable(dev, pos, 0); /* Disable MSI during set up */
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
|
|
/* MSI Entry Initialization */
|
2009-03-17 13:54:07 +01:00
|
|
|
entry = alloc_msi_entry(dev);
|
2007-01-28 20:56:37 +01:00
|
|
|
if (!entry)
|
|
|
|
return -ENOMEM;
|
2006-10-04 11:16:41 +02:00
|
|
|
|
2009-03-17 13:54:06 +01:00
|
|
|
entry->msi_attrib.is_msix = 0;
|
2006-10-04 11:16:33 +02:00
|
|
|
entry->msi_attrib.is_64 = is_64bit_address(control);
|
2005-04-17 00:20:36 +02:00
|
|
|
entry->msi_attrib.entry_nr = 0;
|
|
|
|
entry->msi_attrib.maskbit = is_mask_bit_support(control);
|
2006-10-04 11:16:41 +02:00
|
|
|
entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
|
2006-10-04 11:16:33 +02:00
|
|
|
entry->msi_attrib.pos = pos;
|
2009-03-17 13:54:09 +01:00
|
|
|
|
2009-04-20 03:54:59 +02:00
|
|
|
entry->mask_pos = msi_mask_reg(pos, entry->msi_attrib.is_64);
|
2009-03-17 13:54:09 +01:00
|
|
|
/* All MSIs are unmasked by default, Mask them all */
|
|
|
|
if (entry->msi_attrib.maskbit)
|
|
|
|
pci_read_config_dword(dev, entry->mask_pos, &entry->masked);
|
|
|
|
mask = msi_capable_mask(control);
|
|
|
|
msi_mask_irq(entry, mask, mask);
|
|
|
|
|
2007-06-01 09:46:32 +02:00
|
|
|
list_add_tail(&entry->list, &dev->msi_list);
|
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-04-18 11:39:21 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* Configure MSI capability structure */
|
2009-03-17 13:54:10 +01:00
|
|
|
ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
|
2007-04-18 11:39:21 +02:00
|
|
|
if (ret) {
|
2009-06-23 10:39:27 +02:00
|
|
|
msi_mask_irq(entry, mask, ~mask);
|
2007-04-18 11:39:22 +02:00
|
|
|
msi_free_irqs(dev);
|
2007-04-18 11:39:21 +02:00
|
|
|
return ret;
|
2006-04-11 04:17:48 +02:00
|
|
|
}
|
2007-01-28 20:56:37 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* Set MSI enabled bits */
|
2007-10-25 10:16:30 +02:00
|
|
|
pci_intx_for_msi(dev, 0);
|
2009-06-16 14:31:45 +02:00
|
|
|
msi_set_enable(dev, pos, 1);
|
2007-03-05 09:30:10 +01:00
|
|
|
dev->msi_enabled = 1;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-04-18 11:39:21 +02:00
|
|
|
dev->irq = entry->irq;
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* msix_capability_init - configure device's MSI-X capability
|
|
|
|
* @dev: pointer to the pci_dev data structure of MSI-X device function
|
2005-10-23 20:57:38 +02:00
|
|
|
* @entries: pointer to an array of struct msix_entry entries
|
|
|
|
* @nvec: number of @entries
|
2005-04-17 00:20:36 +02:00
|
|
|
*
|
2005-05-04 02:38:30 +02:00
|
|
|
* Setup the MSI-X capability structure of device function with a
|
2006-10-04 11:16:41 +02:00
|
|
|
* single MSI-X irq. A return of zero indicates the successful setup of
|
|
|
|
* requested MSI-X entries with allocated irqs or non-zero for otherwise.
|
2005-04-17 00:20:36 +02:00
|
|
|
**/
|
|
|
|
static int msix_capability_init(struct pci_dev *dev,
|
|
|
|
struct msix_entry *entries, int nvec)
|
|
|
|
{
|
2007-04-05 09:19:10 +02:00
|
|
|
struct msi_desc *entry;
|
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-04-18 11:39:21 +02:00
|
|
|
int pos, i, j, nr_entries, ret;
|
2006-02-17 08:58:29 +01:00
|
|
|
unsigned long phys_addr;
|
|
|
|
u32 table_offset;
|
2005-04-17 00:20:36 +02:00
|
|
|
u16 control;
|
|
|
|
u8 bir;
|
|
|
|
void __iomem *base;
|
|
|
|
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
2009-06-19 04:15:59 +02:00
|
|
|
pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
|
|
|
|
|
|
|
|
/* Ensure MSI-X is disabled while it is set up */
|
|
|
|
control &= ~PCI_MSIX_FLAGS_ENABLE;
|
|
|
|
pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* Request & Map MSI-X table region */
|
|
|
|
nr_entries = multi_msix_capable(control);
|
2006-02-17 08:58:29 +01:00
|
|
|
|
|
|
|
pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset);
|
2005-04-17 00:20:36 +02:00
|
|
|
bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
|
2006-02-17 08:58:29 +01:00
|
|
|
table_offset &= ~PCI_MSIX_FLAGS_BIRMASK;
|
|
|
|
phys_addr = pci_resource_start (dev, bir) + table_offset;
|
2005-04-17 00:20:36 +02:00
|
|
|
base = ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
|
|
|
|
if (base == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
for (i = 0; i < nvec; i++) {
|
2009-03-17 13:54:07 +01:00
|
|
|
entry = alloc_msi_entry(dev);
|
2009-06-24 05:08:27 +02:00
|
|
|
if (!entry) {
|
|
|
|
if (!i)
|
|
|
|
iounmap(base);
|
|
|
|
else
|
|
|
|
msi_free_irqs(dev);
|
|
|
|
/* No enough memory. Don't try again */
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
j = entries[i].entry;
|
2009-03-17 13:54:06 +01:00
|
|
|
entry->msi_attrib.is_msix = 1;
|
2006-10-04 11:16:33 +02:00
|
|
|
entry->msi_attrib.is_64 = 1;
|
2005-04-17 00:20:36 +02:00
|
|
|
entry->msi_attrib.entry_nr = j;
|
2006-10-04 11:16:41 +02:00
|
|
|
entry->msi_attrib.default_irq = dev->irq;
|
2006-10-04 11:16:33 +02:00
|
|
|
entry->msi_attrib.pos = pos;
|
2005-04-17 00:20:36 +02:00
|
|
|
entry->mask_base = base;
|
2007-01-28 20:56:37 +01:00
|
|
|
|
2007-06-01 09:46:32 +02:00
|
|
|
list_add_tail(&entry->list, &dev->msi_list);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-04-18 11:39:21 +02:00
|
|
|
|
|
|
|
ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
|
2009-02-11 12:27:02 +01:00
|
|
|
if (ret < 0) {
|
|
|
|
/* If we had some success report the number of irqs
|
|
|
|
* we succeeded in setting up. */
|
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-04-18 11:39:21 +02:00
|
|
|
int avail = 0;
|
|
|
|
list_for_each_entry(entry, &dev->msi_list, list) {
|
|
|
|
if (entry->irq != 0) {
|
|
|
|
avail++;
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-04-18 11:39:21 +02:00
|
|
|
|
2009-02-11 12:27:02 +01:00
|
|
|
if (avail != 0)
|
|
|
|
ret = avail;
|
|
|
|
}
|
2007-04-18 11:39:22 +02:00
|
|
|
|
2009-02-11 12:27:02 +01:00
|
|
|
if (ret) {
|
|
|
|
msi_free_irqs(dev);
|
|
|
|
return ret;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-04-18 11:39:21 +02:00
|
|
|
|
2009-06-19 04:15:59 +02:00
|
|
|
/*
|
|
|
|
* Some devices require MSI-X to be enabled before we can touch the
|
|
|
|
* MSI-X registers. We need to mask all the vectors to prevent
|
|
|
|
* interrupts coming in before they're fully set up.
|
|
|
|
*/
|
|
|
|
control |= PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE;
|
|
|
|
pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
|
|
|
|
|
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-04-18 11:39:21 +02:00
|
|
|
i = 0;
|
|
|
|
list_for_each_entry(entry, &dev->msi_list, list) {
|
|
|
|
entries[i].vector = entry->irq;
|
|
|
|
set_irq_msi(entry->irq, entry);
|
2009-06-19 04:15:59 +02:00
|
|
|
j = entries[i].entry;
|
|
|
|
entry->masked = readl(base + j * PCI_MSIX_ENTRY_SIZE +
|
2009-06-23 10:40:04 +02:00
|
|
|
PCI_MSIX_ENTRY_VECTOR_CTRL);
|
2009-06-19 04:15:59 +02:00
|
|
|
msix_mask_irq(entry, 1);
|
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-04-18 11:39:21 +02:00
|
|
|
i++;
|
|
|
|
}
|
2009-06-19 04:15:59 +02:00
|
|
|
|
|
|
|
/* Set MSI-X enabled bits and unmask the function */
|
2007-10-25 10:16:30 +02:00
|
|
|
pci_intx_for_msi(dev, 0);
|
2007-03-05 09:30:10 +01:00
|
|
|
dev->msix_enabled = 1;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-06-19 04:15:59 +02:00
|
|
|
control &= ~PCI_MSIX_FLAGS_MASKALL;
|
|
|
|
pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
|
2009-05-08 15:13:33 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-08-31 07:55:07 +02:00
|
|
|
/**
|
2007-04-05 09:19:07 +02:00
|
|
|
* pci_msi_check_device - check whether MSI may be enabled on a device
|
2006-08-31 07:55:07 +02:00
|
|
|
* @dev: pointer to the pci_dev data structure of MSI device function
|
2007-04-05 09:19:08 +02:00
|
|
|
* @nvec: how many MSIs have been requested ?
|
2007-03-22 11:51:39 +01:00
|
|
|
* @type: are we checking for MSI or MSI-X ?
|
2006-08-31 07:55:07 +02:00
|
|
|
*
|
2006-10-05 10:24:31 +02:00
|
|
|
* Look at global flags, the device itself, and its parent busses
|
2007-04-05 09:19:07 +02:00
|
|
|
* to determine if MSI/-X are supported for the device. If MSI/-X is
|
|
|
|
* supported return 0, else return an error code.
|
2006-08-31 07:55:07 +02:00
|
|
|
**/
|
2007-04-05 09:19:08 +02:00
|
|
|
static int pci_msi_check_device(struct pci_dev* dev, int nvec, int type)
|
2006-08-31 07:55:07 +02:00
|
|
|
{
|
|
|
|
struct pci_bus *bus;
|
2007-04-05 09:19:08 +02:00
|
|
|
int ret;
|
2006-08-31 07:55:07 +02:00
|
|
|
|
2006-10-05 10:24:31 +02:00
|
|
|
/* MSI must be globally enabled and supported by the device */
|
2006-08-31 07:55:07 +02:00
|
|
|
if (!pci_msi_enable || !dev || dev->no_msi)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2007-04-05 09:19:12 +02:00
|
|
|
/*
|
|
|
|
* You can't ask to have 0 or less MSIs configured.
|
|
|
|
* a) it's stupid ..
|
|
|
|
* b) the list manipulation code assumes nvec >= 1.
|
|
|
|
*/
|
|
|
|
if (nvec < 1)
|
|
|
|
return -ERANGE;
|
|
|
|
|
2006-10-05 10:24:31 +02:00
|
|
|
/* Any bridge which does NOT route MSI transactions from it's
|
|
|
|
* secondary bus to it's primary bus must set NO_MSI flag on
|
|
|
|
* the secondary pci_bus.
|
|
|
|
* We expect only arch-specific PCI host bus controller driver
|
|
|
|
* or quirks for specific PCI bridges to be setting NO_MSI.
|
|
|
|
*/
|
2006-08-31 07:55:07 +02:00
|
|
|
for (bus = dev->bus; bus; bus = bus->parent)
|
|
|
|
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2007-04-05 09:19:08 +02:00
|
|
|
ret = arch_msi_check_device(dev, nvec, type);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2007-03-22 11:51:39 +01:00
|
|
|
if (!pci_find_capability(dev, type))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2006-08-31 07:55:07 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/**
|
2009-03-17 13:54:10 +01:00
|
|
|
* pci_enable_msi_block - configure device's MSI capability structure
|
|
|
|
* @dev: device to configure
|
|
|
|
* @nvec: number of interrupts to configure
|
2005-04-17 00:20:36 +02:00
|
|
|
*
|
2009-03-17 13:54:10 +01:00
|
|
|
* Allocate IRQs for a device with the MSI capability.
|
|
|
|
* This function returns a negative errno if an error occurs. If it
|
|
|
|
* is unable to allocate the number of interrupts requested, it returns
|
|
|
|
* the number of interrupts it might be able to allocate. If it successfully
|
|
|
|
* allocates at least the number of interrupts requested, it returns 0 and
|
|
|
|
* updates the @dev's irq member to the lowest new interrupt number; the
|
|
|
|
* other interrupt numbers allocated to this device are consecutive.
|
|
|
|
*/
|
|
|
|
int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2009-03-17 13:54:10 +01:00
|
|
|
int status, pos, maxvec;
|
|
|
|
u16 msgctl;
|
|
|
|
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
|
|
|
if (!pos)
|
|
|
|
return -EINVAL;
|
|
|
|
pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
|
|
|
|
maxvec = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
|
|
|
|
if (nvec > maxvec)
|
|
|
|
return maxvec;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-03-17 13:54:10 +01:00
|
|
|
status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI);
|
2007-04-05 09:19:08 +02:00
|
|
|
if (status)
|
|
|
|
return status;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-01-28 20:42:52 +01:00
|
|
|
WARN_ON(!!dev->msi_enabled);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-03-17 13:54:10 +01:00
|
|
|
/* Check whether driver already requested MSI-X irqs */
|
2007-03-05 09:30:10 +01:00
|
|
|
if (dev->msix_enabled) {
|
2008-06-13 18:52:11 +02:00
|
|
|
dev_info(&dev->dev, "can't enable MSI "
|
|
|
|
"(MSI-X already enabled)\n");
|
2007-03-05 09:30:10 +01:00
|
|
|
return -EINVAL;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2009-03-17 13:54:10 +01:00
|
|
|
|
|
|
|
status = msi_capability_init(dev, nvec);
|
2005-04-17 00:20:36 +02:00
|
|
|
return status;
|
|
|
|
}
|
2009-03-17 13:54:10 +01:00
|
|
|
EXPORT_SYMBOL(pci_enable_msi_block);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-03-17 13:54:09 +01:00
|
|
|
void pci_msi_shutdown(struct pci_dev *dev)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2009-03-17 13:54:09 +01:00
|
|
|
struct msi_desc *desc;
|
|
|
|
u32 mask;
|
|
|
|
u16 ctrl;
|
2009-06-16 14:31:45 +02:00
|
|
|
unsigned pos;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-03-22 11:51:39 +01:00
|
|
|
if (!pci_msi_enable || !dev || !dev->msi_enabled)
|
2007-01-28 20:42:52 +01:00
|
|
|
return;
|
|
|
|
|
2009-06-16 14:31:45 +02:00
|
|
|
BUG_ON(list_empty(&dev->msi_list));
|
|
|
|
desc = list_first_entry(&dev->msi_list, struct msi_desc, list);
|
|
|
|
pos = desc->msi_attrib.pos;
|
|
|
|
|
|
|
|
msi_set_enable(dev, pos, 0);
|
2007-10-25 10:16:30 +02:00
|
|
|
pci_intx_for_msi(dev, 1);
|
2007-03-05 09:30:10 +01:00
|
|
|
dev->msi_enabled = 0;
|
2006-10-04 11:16:31 +02:00
|
|
|
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
/* Return the device with MSI unmasked as initial states */
|
2009-06-16 14:31:45 +02:00
|
|
|
pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &ctrl);
|
2009-03-17 13:54:09 +01:00
|
|
|
mask = msi_capable_mask(ctrl);
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
/* Keep cached state to be restored */
|
|
|
|
__msi_mask_irq(desc, mask, ~mask);
|
2007-03-22 11:51:27 +01:00
|
|
|
|
|
|
|
/* Restore dev->irq to its default pin-assertion irq */
|
2009-03-17 13:54:09 +01:00
|
|
|
dev->irq = desc->msi_attrib.default_irq;
|
2008-04-23 23:58:09 +02:00
|
|
|
}
|
2009-03-17 13:54:06 +01:00
|
|
|
|
2008-04-23 23:58:09 +02:00
|
|
|
void pci_disable_msi(struct pci_dev* dev)
|
|
|
|
{
|
|
|
|
struct msi_desc *entry;
|
|
|
|
|
|
|
|
if (!pci_msi_enable || !dev || !dev->msi_enabled)
|
|
|
|
return;
|
|
|
|
|
|
|
|
pci_msi_shutdown(dev);
|
|
|
|
|
|
|
|
entry = list_entry(dev->msi_list.next, struct msi_desc, list);
|
2009-03-17 13:54:07 +01:00
|
|
|
if (entry->msi_attrib.is_msix)
|
2008-04-23 23:58:09 +02:00
|
|
|
return;
|
|
|
|
|
|
|
|
msi_free_irqs(dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2007-03-22 11:51:34 +01:00
|
|
|
EXPORT_SYMBOL(pci_disable_msi);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-04-18 11:39:22 +02:00
|
|
|
static int msi_free_irqs(struct pci_dev* dev)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2007-04-18 11:39:22 +02:00
|
|
|
struct msi_desc *entry, *tmp;
|
2007-03-22 11:51:34 +01:00
|
|
|
|
2007-05-11 22:26:44 +02:00
|
|
|
list_for_each_entry(entry, &dev->msi_list, list) {
|
2009-03-17 13:54:10 +01:00
|
|
|
int i, nvec;
|
|
|
|
if (!entry->irq)
|
|
|
|
continue;
|
|
|
|
nvec = 1 << entry->msi_attrib.multiple;
|
|
|
|
for (i = 0; i < nvec; i++)
|
|
|
|
BUG_ON(irq_has_action(entry->irq + i));
|
2007-05-11 22:26:44 +02:00
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-04-18 11:39:22 +02:00
|
|
|
arch_teardown_msi_irqs(dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-04-18 11:39:22 +02:00
|
|
|
list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
|
2009-03-17 13:54:06 +01:00
|
|
|
if (entry->msi_attrib.is_msix) {
|
2007-06-01 09:46:33 +02:00
|
|
|
if (list_is_last(&entry->list, &dev->msi_list))
|
|
|
|
iounmap(entry->mask_base);
|
2007-04-18 11:39:22 +02:00
|
|
|
}
|
|
|
|
list_del(&entry->list);
|
|
|
|
kfree(entry);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-01-24 00:21:14 +01:00
|
|
|
/**
|
|
|
|
* pci_msix_table_size - return the number of device's MSI-X table entries
|
|
|
|
* @dev: pointer to the pci_dev data structure of MSI-X device function
|
|
|
|
*/
|
|
|
|
int pci_msix_table_size(struct pci_dev *dev)
|
|
|
|
{
|
|
|
|
int pos;
|
|
|
|
u16 control;
|
|
|
|
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
|
|
if (!pos)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
|
|
return multi_msix_capable(control);
|
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/**
|
|
|
|
* pci_enable_msix - configure device's MSI-X capability structure
|
|
|
|
* @dev: pointer to the pci_dev data structure of MSI-X device function
|
2005-06-07 08:07:46 +02:00
|
|
|
* @entries: pointer to an array of MSI-X entries
|
2006-10-04 11:16:41 +02:00
|
|
|
* @nvec: number of MSI-X irqs requested for allocation by device driver
|
2005-04-17 00:20:36 +02:00
|
|
|
*
|
|
|
|
* Setup the MSI-X capability structure of device function with the number
|
2006-10-04 11:16:41 +02:00
|
|
|
* of requested irqs upon its software driver call to request for
|
2005-04-17 00:20:36 +02:00
|
|
|
* MSI-X mode enabled on its hardware device function. A return of zero
|
|
|
|
* indicates the successful configuration of MSI-X capability structure
|
2006-10-04 11:16:41 +02:00
|
|
|
* with new allocated MSI-X irqs. A return of < 0 indicates a failure.
|
2005-04-17 00:20:36 +02:00
|
|
|
* Or a return of > 0 indicates that driver request is exceeding the number
|
2009-05-07 10:28:41 +02:00
|
|
|
* of irqs or MSI-X vectors available. Driver should use the returned value to
|
|
|
|
* re-send its request.
|
2005-04-17 00:20:36 +02:00
|
|
|
**/
|
|
|
|
int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
|
|
|
|
{
|
2009-01-24 00:21:14 +01:00
|
|
|
int status, nr_entries;
|
2007-01-28 20:42:52 +01:00
|
|
|
int i, j;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-04-05 09:19:08 +02:00
|
|
|
if (!entries)
|
2005-04-17 00:20:36 +02:00
|
|
|
return -EINVAL;
|
|
|
|
|
2007-04-05 09:19:08 +02:00
|
|
|
status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX);
|
|
|
|
if (status)
|
|
|
|
return status;
|
|
|
|
|
2009-01-24 00:21:14 +01:00
|
|
|
nr_entries = pci_msix_table_size(dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (nvec > nr_entries)
|
2009-05-07 10:28:41 +02:00
|
|
|
return nr_entries;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/* Check for any invalid entries */
|
|
|
|
for (i = 0; i < nvec; i++) {
|
|
|
|
if (entries[i].entry >= nr_entries)
|
|
|
|
return -EINVAL; /* invalid entry */
|
|
|
|
for (j = i + 1; j < nvec; j++) {
|
|
|
|
if (entries[i].entry == entries[j].entry)
|
|
|
|
return -EINVAL; /* duplicate entry */
|
|
|
|
}
|
|
|
|
}
|
2007-01-28 20:42:52 +01:00
|
|
|
WARN_ON(!!dev->msix_enabled);
|
2006-10-04 11:16:31 +02:00
|
|
|
|
2006-10-04 11:16:41 +02:00
|
|
|
/* Check whether driver already requested for MSI irq */
|
2007-03-05 09:30:10 +01:00
|
|
|
if (dev->msi_enabled) {
|
2008-06-13 18:52:11 +02:00
|
|
|
dev_info(&dev->dev, "can't enable MSI-X "
|
|
|
|
"(MSI IRQ already assigned)\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
status = msix_capability_init(dev, entries, nvec);
|
|
|
|
return status;
|
|
|
|
}
|
2007-03-22 11:51:34 +01:00
|
|
|
EXPORT_SYMBOL(pci_enable_msix);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-03-22 11:51:33 +01:00
|
|
|
static void msix_free_all_irqs(struct pci_dev *dev)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2007-04-18 11:39:22 +02:00
|
|
|
msi_free_irqs(dev);
|
2007-03-22 11:51:33 +01:00
|
|
|
}
|
|
|
|
|
2008-04-23 23:58:09 +02:00
|
|
|
void pci_msix_shutdown(struct pci_dev* dev)
|
2007-03-22 11:51:33 +01:00
|
|
|
{
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
struct msi_desc *entry;
|
|
|
|
|
2007-03-22 11:51:39 +01:00
|
|
|
if (!pci_msi_enable || !dev || !dev->msix_enabled)
|
2007-01-28 20:42:52 +01:00
|
|
|
return;
|
|
|
|
|
PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
There are 2 problems on mask states in suspend/resume.
[1]:
It is better to restore the mask states of MSI/MSI-X to initial states
(MSI is unmasked, MSI-X is masked) when we release the device.
The pci_msi_shutdown() does the restoration of mask states for MSI,
while the msi_free_irqs() does it for MSI-X. In other words, in the
"disable" path both of MSI and MSI-X are handled, but in the "shutdown"
path only MSI is handled.
MSI:
pci_disable_msi()
=> pci_msi_shutdown()
[ mask states for MSI restored ]
=> msi_set_enable(dev, pos, 0);
=> msi_free_irqs()
MSI-X:
pci_disable_msix()
=> pci_msix_shutdown()
=> msix_set_enable(dev, 0);
=> msix_free_all_irqs
=> msi_free_irqs()
[ mask states for MSI-X restored ]
This patch moves the masking for MSI-X from msi_free_irqs() to
pci_msix_shutdown().
This change has some positive side effects:
- It prevents OS from touching mask states before reading preserved
bits in the register, which can be happen if msi_free_irqs() is
called from error path in msix_capability_init().
- It also prevents touching the register after turning off MSI-X in
"disable" path, which can be a problem on some devices.
[2]:
We have cache of the mask state in msi_desc, which is automatically
updated when msi/msix_mask_irq() is called. This cached states are
used for the resume.
But since what need to be restored in the resume is the states before
the shutdown on the suspend, calling msi/msix_mask_irq() from
pci_msi/msix_shutdown() is not appropriate.
This patch introduces __msi/msix_mask_irq() that do mask as same
as msi/msix_mask_irq() but does not update cached state, for use
in pci_msi/msix_shutdown().
[updated: get rid of msi/msix_mask_irq_nocache() (proposed by Matthew Wilcox)]
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-24 05:08:09 +02:00
|
|
|
/* Return the device with MSI-X masked as initial states */
|
|
|
|
list_for_each_entry(entry, &dev->msi_list, list) {
|
|
|
|
/* Keep cached states to be restored */
|
|
|
|
__msix_mask_irq(entry, 1);
|
|
|
|
}
|
|
|
|
|
2007-03-05 09:30:10 +01:00
|
|
|
msix_set_enable(dev, 0);
|
2007-10-25 10:16:30 +02:00
|
|
|
pci_intx_for_msi(dev, 1);
|
2007-03-05 09:30:10 +01:00
|
|
|
dev->msix_enabled = 0;
|
2008-04-23 23:58:09 +02:00
|
|
|
}
|
|
|
|
void pci_disable_msix(struct pci_dev* dev)
|
|
|
|
{
|
|
|
|
if (!pci_msi_enable || !dev || !dev->msix_enabled)
|
|
|
|
return;
|
|
|
|
|
|
|
|
pci_msix_shutdown(dev);
|
2006-10-04 11:16:31 +02:00
|
|
|
|
2007-03-22 11:51:33 +01:00
|
|
|
msix_free_all_irqs(dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2007-03-22 11:51:34 +01:00
|
|
|
EXPORT_SYMBOL(pci_disable_msix);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/**
|
2006-10-04 11:16:41 +02:00
|
|
|
* msi_remove_pci_irq_vectors - reclaim MSI(X) irqs to unused state
|
2005-04-17 00:20:36 +02:00
|
|
|
* @dev: pointer to the pci_dev data structure of MSI(X) device function
|
|
|
|
*
|
2005-05-04 02:38:30 +02:00
|
|
|
* Being called during hotplug remove, from which the device function
|
2006-10-04 11:16:41 +02:00
|
|
|
* is hot-removed. All previous assigned MSI/MSI-X irqs, if
|
2005-04-17 00:20:36 +02:00
|
|
|
* allocated for this device function, are reclaimed to unused state,
|
|
|
|
* which may be used later on.
|
|
|
|
**/
|
|
|
|
void msi_remove_pci_irq_vectors(struct pci_dev* dev)
|
|
|
|
{
|
|
|
|
if (!pci_msi_enable || !dev)
|
|
|
|
return;
|
|
|
|
|
2007-04-18 11:39:22 +02:00
|
|
|
if (dev->msi_enabled)
|
|
|
|
msi_free_irqs(dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-03-22 11:51:33 +01:00
|
|
|
if (dev->msix_enabled)
|
|
|
|
msix_free_all_irqs(dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2006-03-06 06:33:34 +01:00
|
|
|
void pci_no_msi(void)
|
|
|
|
{
|
|
|
|
pci_msi_enable = 0;
|
|
|
|
}
|
2007-04-05 09:19:08 +02:00
|
|
|
|
2008-11-10 23:31:05 +01:00
|
|
|
/**
|
|
|
|
* pci_msi_enabled - is MSI enabled?
|
|
|
|
*
|
|
|
|
* Returns true if MSI has not been disabled by the command-line option
|
|
|
|
* pci=nomsi.
|
|
|
|
**/
|
|
|
|
int pci_msi_enabled(void)
|
2008-10-17 06:52:51 +02:00
|
|
|
{
|
2008-11-10 23:31:05 +01:00
|
|
|
return pci_msi_enable;
|
2008-10-17 06:52:51 +02:00
|
|
|
}
|
2008-11-10 23:31:05 +01:00
|
|
|
EXPORT_SYMBOL(pci_msi_enabled);
|
2008-10-17 06:52:51 +02:00
|
|
|
|
2008-11-10 23:31:05 +01:00
|
|
|
void pci_msi_init_pci_dev(struct pci_dev *dev)
|
2008-10-17 06:52:51 +02:00
|
|
|
{
|
2008-11-10 23:31:05 +01:00
|
|
|
INIT_LIST_HEAD(&dev->msi_list);
|
2008-10-17 06:52:51 +02:00
|
|
|
}
|