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path: root/drivers/pci/msi.c
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Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r--drivers/pci/msi.c144
1 files changed, 64 insertions, 80 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index fd1068b59b0..c43e7d22e18 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -38,6 +38,36 @@ static int msi_cache_init(void)
return 0;
}
+static void msi_set_enable(struct pci_dev *dev, int enable)
+{
+ int pos;
+ u16 control;
+
+ pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
+ if (pos) {
+ 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);
+ }
+}
+
+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);
+ }
+}
+
static void msi_set_mask_bit(unsigned int irq, int flag)
{
struct msi_desc *entry;
@@ -192,44 +222,6 @@ static struct msi_desc* alloc_msi_entry(void)
return entry;
}
-static void enable_msi_mode(struct pci_dev *dev, int pos, int type)
-{
- u16 control;
-
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (type == PCI_CAP_ID_MSI) {
- /* Set enabled bits to single MSI & enable MSI_enable bit */
- msi_enable(control, 1);
- pci_write_config_word(dev, msi_control_reg(pos), control);
- dev->msi_enabled = 1;
- } else {
- msix_enable(control);
- pci_write_config_word(dev, msi_control_reg(pos), control);
- dev->msix_enabled = 1;
- }
-
- pci_intx(dev, 0); /* disable intx */
-}
-
-static void disable_msi_mode(struct pci_dev *dev, int pos, int type)
-{
- u16 control;
-
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (type == PCI_CAP_ID_MSI) {
- /* Set enabled bits to single MSI & enable MSI_enable bit */
- msi_disable(control);
- pci_write_config_word(dev, msi_control_reg(pos), control);
- dev->msi_enabled = 0;
- } else {
- msix_disable(control);
- pci_write_config_word(dev, msi_control_reg(pos), control);
- dev->msix_enabled = 0;
- }
-
- pci_intx(dev, 1); /* enable intx */
-}
-
#ifdef CONFIG_PM
static int __pci_save_msi_state(struct pci_dev *dev)
{
@@ -238,12 +230,11 @@ static int __pci_save_msi_state(struct pci_dev *dev)
struct pci_cap_saved_state *save_state;
u32 *cap;
- pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (pos <= 0 || dev->no_msi)
+ if (!dev->msi_enabled)
return 0;
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (!(control & PCI_MSI_FLAGS_ENABLE))
+ pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
+ if (pos <= 0)
return 0;
save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u32) * 5,
@@ -276,13 +267,18 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
struct pci_cap_saved_state *save_state;
u32 *cap;
+ if (!dev->msi_enabled)
+ return;
+
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSI);
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!save_state || pos <= 0)
return;
cap = &save_state->data[0];
+ pci_intx(dev, 0); /* disable intx */
control = cap[i++] >> 16;
+ msi_set_enable(dev, 0);
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, cap[i++]);
if (control & PCI_MSI_FLAGS_64BIT) {
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, cap[i++]);
@@ -292,7 +288,6 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
if (control & PCI_MSI_FLAGS_MASKBIT)
pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT, cap[i++]);
pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
- enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
pci_remove_saved_cap(save_state);
kfree(save_state);
}
@@ -308,13 +303,11 @@ static int __pci_save_msix_state(struct pci_dev *dev)
return 0;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (pos <= 0 || dev->no_msi)
+ if (pos <= 0)
return 0;
/* save the capability */
pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (!(control & PCI_MSIX_FLAGS_ENABLE))
- return 0;
save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u16),
GFP_KERNEL);
if (!save_state) {
@@ -376,6 +369,8 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
return;
/* route the table */
+ pci_intx(dev, 0); /* disable intx */
+ msix_set_enable(dev, 0);
irq = head = dev->first_msi_irq;
while (head != tail) {
entry = get_irq_msi(irq);
@@ -386,7 +381,6 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
}
pci_write_config_word(dev, msi_control_reg(pos), save);
- enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
}
void pci_restore_msi_state(struct pci_dev *dev)
@@ -411,6 +405,8 @@ static int msi_capability_init(struct pci_dev *dev)
int pos, irq;
u16 control;
+ msi_set_enable(dev, 0); /* Ensure msi is disabled as I set it up */
+
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
pci_read_config_word(dev, msi_control_reg(pos), &control);
/* MSI Entry Initialization */
@@ -454,7 +450,9 @@ static int msi_capability_init(struct pci_dev *dev)
set_irq_msi(irq, entry);
/* Set MSI enabled bits */
- enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
+ pci_intx(dev, 0); /* disable intx */
+ msi_set_enable(dev, 1);
+ dev->msi_enabled = 1;
dev->irq = irq;
return 0;
@@ -481,6 +479,8 @@ static int msix_capability_init(struct pci_dev *dev,
u8 bir;
void __iomem *base;
+ msix_set_enable(dev, 0);/* Ensure msix is disabled as I set it up */
+
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
/* Request & Map MSI-X table region */
pci_read_config_word(dev, msi_control_reg(pos), &control);
@@ -549,7 +549,9 @@ static int msix_capability_init(struct pci_dev *dev,
}
dev->first_msi_irq = entries[0].vector;
/* Set MSI-X enabled bits */
- enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
+ pci_intx(dev, 0); /* disable intx */
+ msix_set_enable(dev, 1);
+ dev->msix_enabled = 1;
return 0;
}
@@ -611,12 +613,11 @@ int pci_enable_msi(struct pci_dev* dev)
WARN_ON(!!dev->msi_enabled);
/* Check whether driver already requested for MSI-X irqs */
- pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (pos > 0 && dev->msix_enabled) {
- printk(KERN_INFO "PCI: %s: Can't enable MSI. "
- "Device already has MSI-X enabled\n",
- pci_name(dev));
- return -EINVAL;
+ if (dev->msix_enabled) {
+ printk(KERN_INFO "PCI: %s: Can't enable MSI. "
+ "Device already has MSI-X enabled\n",
+ pci_name(dev));
+ return -EINVAL;
}
status = msi_capability_init(dev);
return status;
@@ -625,8 +626,7 @@ int pci_enable_msi(struct pci_dev* dev)
void pci_disable_msi(struct pci_dev* dev)
{
struct msi_desc *entry;
- int pos, default_irq;
- u16 control;
+ int default_irq;
if (!pci_msi_enable)
return;
@@ -636,16 +636,9 @@ void pci_disable_msi(struct pci_dev* dev)
if (!dev->msi_enabled)
return;
- pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (!pos)
- return;
-
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (!(control & PCI_MSI_FLAGS_ENABLE))
- return;
-
-
- disable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
+ msi_set_enable(dev, 0);
+ pci_intx(dev, 1); /* enable intx */
+ dev->msi_enabled = 0;
entry = get_irq_msi(dev->first_msi_irq);
if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) {
@@ -746,8 +739,7 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
WARN_ON(!!dev->msix_enabled);
/* Check whether driver already requested for MSI irq */
- if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 &&
- dev->msi_enabled) {
+ if (dev->msi_enabled) {
printk(KERN_INFO "PCI: %s: Can't enable MSI-X. "
"Device already has an MSI irq assigned\n",
pci_name(dev));
@@ -760,8 +752,6 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
void pci_disable_msix(struct pci_dev* dev)
{
int irq, head, tail = 0, warning = 0;
- int pos;
- u16 control;
if (!pci_msi_enable)
return;
@@ -771,15 +761,9 @@ void pci_disable_msix(struct pci_dev* dev)
if (!dev->msix_enabled)
return;
- pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (!pos)
- return;
-
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (!(control & PCI_MSIX_FLAGS_ENABLE))
- return;
-
- disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
+ msix_set_enable(dev, 0);
+ pci_intx(dev, 1); /* enable intx */
+ dev->msix_enabled = 0;
irq = head = dev->first_msi_irq;
while (head != tail) {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-30 17:49:44 +0000