[PATCH 5/6] msi: Kill the msi_desc array.

From: Eric W. Biederman
Date: Sun Jan 28 2007 - 14:53:27 EST

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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@xxxxxxxxxxxx>
---
arch/ia64/sn/kernel/msi_sn.c | 2 +-
drivers/pci/msi.c | 44 ++++++++++++++++++++---------------------
include/linux/irq.h | 4 +++
kernel/irq/chip.c | 28 ++++++++++++++++++++++++++
4 files changed, 54 insertions(+), 24 deletions(-)

diff --git a/arch/ia64/sn/kernel/msi_sn.c b/arch/ia64/sn/kernel/msi_sn.c
index b3a435f..31fbb85 100644
--- a/arch/ia64/sn/kernel/msi_sn.c
+++ b/arch/ia64/sn/kernel/msi_sn.c
@@ -74,7 +74,7 @@ int sn_setup_msi_irq(unsigned int irq, struct pci_dev *pdev)
struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);

- entry = get_irq_data(irq);
+ entry = get_irq_msi(irq);
if (!entry->msi_attrib.is_64)
return -EINVAL;

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index b994012..d7a2259 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -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);
}
@@ -371,10 +370,10 @@ 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;
}

@@ -421,10 +420,10 @@ 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;
}

@@ -462,7 +461,7 @@ 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;
@@ -497,7 +496,7 @@ 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);

@@ -546,7 +545,7 @@ 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;
@@ -576,7 +575,7 @@ 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;
@@ -693,7 +692,7 @@ 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;
}
@@ -720,7 +719,7 @@ 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;
}
@@ -728,10 +727,9 @@ 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);

@@ -832,7 +830,7 @@ 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 */
@@ -878,8 +876,8 @@ 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 */
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 52fc405..5504b67 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -68,6 +68,7 @@ typedef void fastcall (*irq_flow_handler_t)(unsigned int irq,
#define IRQ_MOVE_PENDING 0x40000000 /* need to re-target IRQ destination */

struct proc_dir_entry;
+struct msi_desc;

/**
* struct irq_chip - hardware interrupt chip descriptor
@@ -148,6 +149,7 @@ struct irq_chip {
struct irq_desc {
irq_flow_handler_t handle_irq;
struct irq_chip *chip;
+ struct msi_desc *msi_desc;
void *handler_data;
void *chip_data;
struct irqaction *action; /* IRQ action list */
@@ -373,10 +375,12 @@ extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
extern int set_irq_data(unsigned int irq, void *data);
extern int set_irq_chip_data(unsigned int irq, void *data);
extern int set_irq_type(unsigned int irq, unsigned int type);
+extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);

#define get_irq_chip(irq) (irq_desc[irq].chip)
#define get_irq_chip_data(irq) (irq_desc[irq].chip_data)
#define get_irq_data(irq) (irq_desc[irq].handler_data)
+#define get_irq_msi(irq) (irq_desc[irq].msi_desc)

#endif /* CONFIG_GENERIC_HARDIRQS */

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index d27b258..475e8a7 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -39,6 +39,7 @@ void dynamic_irq_init(unsigned int irq)
desc->chip = &no_irq_chip;
desc->handle_irq = handle_bad_irq;
desc->depth = 1;
+ desc->msi_desc = NULL;
desc->handler_data = NULL;
desc->chip_data = NULL;
desc->action = NULL;
@@ -74,6 +75,9 @@ void dynamic_irq_cleanup(unsigned int irq)
WARN_ON(1);
return;
}
+ desc->msi_desc = NULL;
+ desc->handler_data = NULL;
+ desc->chip_data = NULL;
desc->handle_irq = handle_bad_irq;
desc->chip = &no_irq_chip;
spin_unlock_irqrestore(&desc->lock, flags);
@@ -162,6 +166,30 @@ int set_irq_data(unsigned int irq, void *data)
EXPORT_SYMBOL(set_irq_data);

/**
+ * set_irq_data - set irq type data for an irq
+ * @irq: Interrupt number
+ * @data: Pointer to interrupt specific data
+ *
+ * Set the hardware irq controller data for an irq
+ */
+int set_irq_msi(unsigned int irq, struct msi_desc *entry)
+{
+ struct irq_desc *desc;
+ unsigned long flags;
+
+ if (irq >= NR_IRQS) {
+ printk(KERN_ERR
+ "Trying to install msi data for IRQ%d\n", irq);
+ return -EINVAL;
+ }
+ desc = irq_desc + irq;
+ spin_lock_irqsave(&desc->lock, flags);
+ desc->msi_desc = entry;
+ spin_unlock_irqrestore(&desc->lock, flags);
+ return 0;
+}
+
+/**
* set_irq_chip_data - set irq chip data for an irq
* @irq: Interrupt number
* @data: Pointer to chip specific data
--
1.4.4.1.g278f

-
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Next message: Nigel Cunningham: "Re: [Q] Prefered suspend to ram or disk method ?"
Previous message: Michael Tokarev: "Re: Raid 10 question/problem [ot]"
In reply to: Eric W. Biederman: "[PATCH 4/6] msi: Remove attach_msi_entry."
Next in thread: Eric W. Biederman: "[PATCH 6/6] msi: Make MSI useable more architectures"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]