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msi: Kill the msi_desc array.

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We need to be able to get from an irq number to a struct msi_desc.
The msi_desc array in msi.c had several short comings the big one was
that it could not be used outside of msi.c.  Using irq_data in struct
irq_desc almost worked except on some architectures irq_data needs to
be used for something else.

So this patch adds a msi_desc pointer to irq_desc, adds the appropriate
wrappers and changes all of the msi code to use them.

The dynamic_irq_init/cleanup code was tweaked to ensure the new
field is left in a well defined state.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Eric W. Biederman
2007-01-28 12:52:03 -07:00
committed by Greg Kroah-Hartman
parent 1c659d61cf
commit 5b912c108c
4 changed files with 54 additions and 24 deletions
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44
drivers/pci/msi.c
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@ -24,7 +24,6 @@
#include "pci.h"
#include "msi.h"
static struct msi_desc* msi_desc[NR_IRQS] = { [0 ... NR_IRQS-1] = NULL };
static struct kmem_cache* msi_cachep;
static int pci_msi_enable = 1;
@ -43,7 +42,7 @@ static void msi_set_mask_bit(unsigned int irq, int flag)
{
struct msi_desc *entry;
entry = msi_desc[irq];
entry = get_irq_msi(irq);
BUG_ON(!entry || !entry->dev);
switch (entry->msi_attrib.type) {
case PCI_CAP_ID_MSI:
@ -73,7 +72,7 @@ static void msi_set_mask_bit(unsigned int irq, int flag)
void read_msi_msg(unsigned int irq, struct msi_msg *msg)
{
struct msi_desc *entry = get_irq_data(irq);
struct msi_desc *entry = get_irq_msi(irq);
switch(entry->msi_attrib.type) {
case PCI_CAP_ID_MSI:
{
@ -112,7 +111,7 @@ void read_msi_msg(unsigned int irq, struct msi_msg *msg)
void write_msi_msg(unsigned int irq, struct msi_msg *msg)
{
struct msi_desc *entry = get_irq_data(irq);
struct msi_desc *entry = get_irq_msi(irq);
switch (entry->msi_attrib.type) {
case PCI_CAP_ID_MSI:
{
@ -208,7 +207,7 @@ static int create_msi_irq(void)
return -EBUSY;
}
set_irq_data(irq, entry);
set_irq_msi(irq, entry);
return irq;
}
@ -217,9 +216,9 @@ static void destroy_msi_irq(unsigned int irq)
{
struct msi_desc *entry;
entry = get_irq_data(irq);
entry = get_irq_msi(irq);
set_irq_chip(irq, NULL);
set_irq_data(irq, NULL);
set_irq_msi(irq, NULL);
destroy_irq(irq);
kmem_cache_free(msi_cachep, entry);
}
@ -360,10 +359,10 @@ static int __pci_save_msix_state(struct pci_dev *dev)
while (head != tail) {
struct msi_desc *entry;
entry = msi_desc[irq];
entry = get_irq_msi(irq);
read_msi_msg(irq, &entry->msg_save);
tail = msi_desc[irq]->link.tail;
tail = entry->link.tail;
irq = tail;
}
@ -410,10 +409,10 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
/* route the table */
irq = head = dev->first_msi_irq;
while (head != tail) {
entry = msi_desc[irq];
entry = get_irq_msi(irq);
write_msi_msg(irq, &entry->msg_save);
tail = msi_desc[irq]->link.tail;
tail = entry->link.tail;
irq = tail;
}
@ -451,7 +450,7 @@ static int msi_capability_init(struct pci_dev *dev)
if (irq < 0)
return irq;
entry = get_irq_data(irq);
entry = get_irq_msi(irq);
entry->link.head = irq;
entry->link.tail = irq;
entry->msi_attrib.type = PCI_CAP_ID_MSI;
@ -486,7 +485,7 @@ static int msi_capability_init(struct pci_dev *dev)
}
dev->first_msi_irq = irq;
msi_desc[irq] = entry;
set_irq_msi(irq, entry);
/* Set MSI enabled bits */
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
@ -535,7 +534,7 @@ static int msix_capability_init(struct pci_dev *dev,
if (irq < 0)
break;
entry = get_irq_data(irq);
entry = get_irq_msi(irq);
j = entries[i].entry;
entries[i].vector = irq;
entry->msi_attrib.type = PCI_CAP_ID_MSIX;
@ -565,7 +564,7 @@ static int msix_capability_init(struct pci_dev *dev,
break;
}
msi_desc[irq] = entry;
set_irq_msi(irq, entry);
}
if (i != nvec) {
int avail = i - 1;
@ -682,7 +681,7 @@ void pci_disable_msi(struct pci_dev* dev)
disable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
entry = msi_desc[dev->first_msi_irq];
entry = get_irq_msi(dev->first_msi_irq);
if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) {
return;
}
@ -709,7 +708,7 @@ static int msi_free_irq(struct pci_dev* dev, int irq)
arch_teardown_msi_irq(irq);
entry = msi_desc[irq];
entry = get_irq_msi(irq);
if (!entry || entry->dev != dev) {
return -EINVAL;
}
@ -717,10 +716,9 @@ static int msi_free_irq(struct pci_dev* dev, int irq)
entry_nr = entry->msi_attrib.entry_nr;
head = entry->link.head;
base = entry->mask_base;
msi_desc[entry->link.head]->link.tail = entry->link.tail;
msi_desc[entry->link.tail]->link.head = entry->link.head;
get_irq_msi(entry->link.head)->link.tail = entry->link.tail;
get_irq_msi(entry->link.tail)->link.head = entry->link.head;
entry->dev = NULL;
msi_desc[irq] = NULL;
destroy_msi_irq(irq);
@ -821,7 +819,7 @@ void pci_disable_msix(struct pci_dev* dev)
irq = head = dev->first_msi_irq;
while (head != tail) {
tail = msi_desc[irq]->link.tail;
tail = get_irq_msi(irq)->link.tail;
if (irq_has_action(irq))
warning = 1;
else if (irq != head) /* Release MSI-X irq */
@ -867,8 +865,8 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
irq = head = dev->first_msi_irq;
while (head != tail) {
tail = msi_desc[irq]->link.tail;
base = msi_desc[irq]->mask_base;
tail = get_irq_msi(irq)->link.tail;
base = get_irq_msi(irq)->mask_base;
if (irq_has_action(irq))
warning = 1;
else if (irq != head) /* Release MSI-X irq */