#include "pci.h"
#include "msi.h"
-static DEFINE_SPINLOCK(msi_lock);
-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;
-static int msi_cache_init(void)
+static void msi_set_enable(struct pci_dev *dev, int enable)
{
- msi_cachep = kmem_cache_create("msi_cache", sizeof(struct msi_desc),
- 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
- if (!msi_cachep)
- return -ENOMEM;
+ int pos;
+ u16 control;
- return 0;
+ 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 msix_flush_writes(unsigned int irq)
+{
+ struct msi_desc *entry;
+
+ entry = get_irq_msi(irq);
+ BUG_ON(!entry || !entry->dev);
+ switch (entry->msi_attrib.type) {
+ case PCI_CAP_ID_MSI:
+ /* nothing to do */
+ break;
+ case PCI_CAP_ID_MSIX:
+ {
+ int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
+ PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET;
+ readl(entry->mask_base + offset);
+ break;
+ }
+ default:
+ BUG();
+ break;
+ }
}
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:
if (entry->msi_attrib.maskbit) {
- int pos;
- u32 mask_bits;
+ int pos;
+ u32 mask_bits;
pos = (long)entry->mask_base;
pci_read_config_dword(entry->dev, pos, &mask_bits);
mask_bits &= ~(1);
mask_bits |= flag;
pci_write_config_dword(entry->dev, pos, mask_bits);
+ } else {
+ msi_set_enable(entry->dev, !flag);
}
break;
case PCI_CAP_ID_MSIX:
int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET;
writel(flag, entry->mask_base + offset);
+ readl(entry->mask_base + offset);
break;
}
default:
BUG();
break;
}
+ entry->msi_attrib.masked = !!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:
{
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:
{
default:
BUG();
}
+ entry->msg = *msg;
}
void mask_msi_irq(unsigned int irq)
{
msi_set_mask_bit(irq, 1);
+ msix_flush_writes(irq);
}
void unmask_msi_irq(unsigned int irq)
{
msi_set_mask_bit(irq, 0);
+ msix_flush_writes(irq);
}
static int msi_free_irq(struct pci_dev* dev, int irq);
-static int msi_init(void)
-{
- static int status = -ENOMEM;
- if (!status)
- return status;
-
- if (pci_msi_quirk) {
- pci_msi_enable = 0;
- printk(KERN_WARNING "PCI: MSI quirk detected. MSI disabled.\n");
- status = -EINVAL;
- return status;
- }
-
- status = msi_cache_init();
- if (status < 0) {
- pci_msi_enable = 0;
- printk(KERN_WARNING "PCI: MSI cache init failed\n");
- return status;
- }
-
- return status;
-}
static struct msi_desc* alloc_msi_entry(void)
{
struct msi_desc *entry;
- entry = kmem_cache_zalloc(msi_cachep, GFP_KERNEL);
+ entry = kzalloc(sizeof(struct msi_desc), GFP_KERNEL);
if (!entry)
return NULL;
- entry->link.tail = entry->link.head = 0; /* single message */
+ INIT_LIST_HEAD(&entry->list);
+ entry->irq = 0;
entry->dev = NULL;
return entry;
}
-static void attach_msi_entry(struct msi_desc *entry, int irq)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&msi_lock, flags);
- msi_desc[irq] = entry;
- spin_unlock_irqrestore(&msi_lock, flags);
-}
-
-static int create_msi_irq(void)
-{
- struct msi_desc *entry;
- int irq;
-
- entry = alloc_msi_entry();
- if (!entry)
- return -ENOMEM;
-
- irq = create_irq();
- if (irq < 0) {
- kmem_cache_free(msi_cachep, entry);
- return -EBUSY;
- }
-
- set_irq_data(irq, entry);
-
- return irq;
-}
-
-static void destroy_msi_irq(unsigned int irq)
-{
- struct msi_desc *entry;
-
- entry = get_irq_data(irq);
- set_irq_chip(irq, NULL);
- set_irq_data(irq, NULL);
- destroy_irq(irq);
- kmem_cache_free(msi_cachep, 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 */
-}
-
-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 */
-}
-
-static int msi_lookup_irq(struct pci_dev *dev, int type)
-{
- int irq;
- unsigned long flags;
-
- spin_lock_irqsave(&msi_lock, flags);
- for (irq = 0; irq < NR_IRQS; irq++) {
- if (!msi_desc[irq] || msi_desc[irq]->dev != dev ||
- msi_desc[irq]->msi_attrib.type != type ||
- msi_desc[irq]->msi_attrib.default_irq != dev->irq)
- continue;
- spin_unlock_irqrestore(&msi_lock, flags);
- /* This pre-assigned MSI irq for this device
- already exits. Override dev->irq with this irq */
- dev->irq = irq;
- return 0;
- }
- spin_unlock_irqrestore(&msi_lock, flags);
-
- return -EACCES;
-}
-
-void pci_scan_msi_device(struct pci_dev *dev)
-{
- if (!dev)
- return;
-}
-
#ifdef CONFIG_PM
-int pci_save_msi_state(struct pci_dev *dev)
+static void __pci_restore_msi_state(struct pci_dev *dev)
{
- int pos, i = 0;
+ int pos;
u16 control;
- struct pci_cap_saved_state *save_state;
- u32 *cap;
-
- pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (pos <= 0 || dev->no_msi)
- return 0;
+ struct msi_desc *entry;
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (!(control & PCI_MSI_FLAGS_ENABLE))
- return 0;
+ if (!dev->msi_enabled)
+ return;
- save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u32) * 5,
- GFP_KERNEL);
- if (!save_state) {
- printk(KERN_ERR "Out of memory in pci_save_msi_state\n");
- return -ENOMEM;
- }
- cap = &save_state->data[0];
-
- pci_read_config_dword(dev, pos, &cap[i++]);
- control = cap[0] >> 16;
- pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, &cap[i++]);
- if (control & PCI_MSI_FLAGS_64BIT) {
- pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, &cap[i++]);
- pci_read_config_dword(dev, pos + PCI_MSI_DATA_64, &cap[i++]);
- } else
- pci_read_config_dword(dev, pos + PCI_MSI_DATA_32, &cap[i++]);
- if (control & PCI_MSI_FLAGS_MASKBIT)
- pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT, &cap[i++]);
- save_state->cap_nr = PCI_CAP_ID_MSI;
- pci_add_saved_cap(dev, save_state);
- return 0;
-}
+ entry = get_irq_msi(dev->irq);
+ pos = entry->msi_attrib.pos;
-void pci_restore_msi_state(struct pci_dev *dev)
-{
- int i = 0, pos;
- u16 control;
- struct pci_cap_saved_state *save_state;
- u32 *cap;
+ pci_intx(dev, 0); /* disable intx */
+ msi_set_enable(dev, 0);
+ write_msi_msg(dev->irq, &entry->msg);
+ if (entry->msi_attrib.maskbit)
+ msi_set_mask_bit(dev->irq, entry->msi_attrib.masked);
- 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];
-
- control = cap[i++] >> 16;
- 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++]);
- pci_write_config_dword(dev, pos + PCI_MSI_DATA_64, cap[i++]);
- } else
- pci_write_config_dword(dev, pos + PCI_MSI_DATA_32, cap[i++]);
- if (control & PCI_MSI_FLAGS_MASKBIT)
- pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT, cap[i++]);
+ pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
+ control &= ~(PCI_MSI_FLAGS_QSIZE | PCI_MSI_FLAGS_ENABLE);
+ if (entry->msi_attrib.maskbit || !entry->msi_attrib.masked)
+ control |= PCI_MSI_FLAGS_ENABLE;
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);
}
-int pci_save_msix_state(struct pci_dev *dev)
+static void __pci_restore_msix_state(struct pci_dev *dev)
{
int pos;
- int temp;
- int irq, head, tail = 0;
+ struct msi_desc *entry;
u16 control;
- struct pci_cap_saved_state *save_state;
- pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (pos <= 0 || dev->no_msi)
- 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) {
- printk(KERN_ERR "Out of memory in pci_save_msix_state\n");
- return -ENOMEM;
- }
- *((u16 *)&save_state->data[0]) = control;
-
- /* save the table */
- temp = dev->irq;
- if (msi_lookup_irq(dev, PCI_CAP_ID_MSIX)) {
- kfree(save_state);
- return -EINVAL;
- }
-
- irq = head = dev->irq;
- while (head != tail) {
- struct msi_desc *entry;
+ if (!dev->msix_enabled)
+ return;
- entry = msi_desc[irq];
- read_msi_msg(irq, &entry->msg_save);
+ /* route the table */
+ pci_intx(dev, 0); /* disable intx */
+ msix_set_enable(dev, 0);
- tail = msi_desc[irq]->link.tail;
- irq = tail;
+ list_for_each_entry(entry, &dev->msi_list, list) {
+ write_msi_msg(entry->irq, &entry->msg);
+ msi_set_mask_bit(entry->irq, entry->msi_attrib.masked);
}
- dev->irq = temp;
- save_state->cap_nr = PCI_CAP_ID_MSIX;
- pci_add_saved_cap(dev, save_state);
- return 0;
+ 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);
+ control &= ~PCI_MSIX_FLAGS_MASKALL;
+ control |= PCI_MSIX_FLAGS_ENABLE;
+ pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
}
-void pci_restore_msix_state(struct pci_dev *dev)
+void pci_restore_msi_state(struct pci_dev *dev)
{
- u16 save;
- int pos;
- int irq, head, tail = 0;
- struct msi_desc *entry;
- int temp;
- struct pci_cap_saved_state *save_state;
-
- save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSIX);
- if (!save_state)
- return;
- save = *((u16 *)&save_state->data[0]);
- pci_remove_saved_cap(save_state);
- kfree(save_state);
-
- pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (pos <= 0)
- return;
-
- /* route the table */
- temp = dev->irq;
- if (msi_lookup_irq(dev, PCI_CAP_ID_MSIX))
- return;
- irq = head = dev->irq;
- while (head != tail) {
- entry = msi_desc[irq];
- write_msi_msg(irq, &entry->msg_save);
-
- tail = msi_desc[irq]->link.tail;
- irq = tail;
- }
- dev->irq = temp;
-
- pci_write_config_word(dev, msi_control_reg(pos), save);
- enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
+ __pci_restore_msi_state(dev);
+ __pci_restore_msix_state(dev);
}
-#endif
+#endif /* CONFIG_PM */
/**
* msi_capability_init - configure device's MSI capability structure
**/
static int msi_capability_init(struct pci_dev *dev)
{
- int status;
struct msi_desc *entry;
- int pos, irq;
+ int pos, ret;
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 */
- irq = create_msi_irq();
- if (irq < 0)
- return irq;
+ entry = alloc_msi_entry();
+ if (!entry)
+ return -ENOMEM;
- entry = get_irq_data(irq);
- entry->link.head = irq;
- entry->link.tail = irq;
entry->msi_attrib.type = PCI_CAP_ID_MSI;
entry->msi_attrib.is_64 = is_64bit_address(control);
entry->msi_attrib.entry_nr = 0;
entry->msi_attrib.maskbit = is_mask_bit_support(control);
+ entry->msi_attrib.masked = 1;
entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
entry->msi_attrib.pos = pos;
if (is_mask_bit_support(control)) {
maskbits);
}
/* Configure MSI capability structure */
- status = arch_setup_msi_irq(irq, dev);
- if (status < 0) {
- destroy_msi_irq(irq);
- return status;
+ ret = arch_setup_msi_irq(dev, entry);
+ if (ret) {
+ kfree(entry);
+ return ret;
}
+ list_add(&entry->list, &dev->msi_list);
- attach_msi_entry(entry, irq);
/* 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;
+ dev->irq = entry->irq;
return 0;
}
static int msix_capability_init(struct pci_dev *dev,
struct msix_entry *entries, int nvec)
{
- struct msi_desc *head = NULL, *tail = NULL, *entry = NULL;
- int status;
- int irq, pos, i, j, nr_entries, temp = 0;
+ struct msi_desc *entry;
+ int irq, pos, i, j, nr_entries, ret;
unsigned long phys_addr;
u32 table_offset;
u16 control;
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);
/* MSI-X Table Initialization */
for (i = 0; i < nvec; i++) {
- irq = create_msi_irq();
- if (irq < 0)
+ entry = alloc_msi_entry();
+ if (!entry)
break;
- entry = get_irq_data(irq);
j = entries[i].entry;
- entries[i].vector = irq;
entry->msi_attrib.type = PCI_CAP_ID_MSIX;
entry->msi_attrib.is_64 = 1;
entry->msi_attrib.entry_nr = j;
entry->msi_attrib.maskbit = 1;
+ entry->msi_attrib.masked = 1;
entry->msi_attrib.default_irq = dev->irq;
entry->msi_attrib.pos = pos;
entry->dev = dev;
entry->mask_base = base;
- if (!head) {
- entry->link.head = irq;
- entry->link.tail = irq;
- head = entry;
- } else {
- entry->link.head = temp;
- entry->link.tail = tail->link.tail;
- tail->link.tail = irq;
- head->link.head = irq;
- }
- temp = irq;
- tail = entry;
+
/* Configure MSI-X capability structure */
- status = arch_setup_msi_irq(irq, dev);
- if (status < 0) {
- destroy_msi_irq(irq);
+ ret = arch_setup_msi_irq(dev, entry);
+ if (ret) {
+ kfree(entry);
break;
}
-
- attach_msi_entry(entry, irq);
+ entries[i].vector = entry->irq;
+ list_add(&entry->list, &dev->msi_list);
}
if (i != nvec) {
int avail = i - 1;
return avail;
}
/* 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;
}
/**
- * pci_msi_supported - check whether MSI may be enabled on device
+ * pci_msi_check_device - check whether MSI may be enabled on a device
* @dev: pointer to the pci_dev data structure of MSI device function
+ * @nvec: how many MSIs have been requested ?
+ * @type: are we checking for MSI or MSI-X ?
*
* Look at global flags, the device itself, and its parent busses
- * to return 0 if MSI are supported for the device.
+ * to determine if MSI/-X are supported for the device. If MSI/-X is
+ * supported return 0, else return an error code.
**/
-static
-int pci_msi_supported(struct pci_dev * dev)
+static int pci_msi_check_device(struct pci_dev* dev, int nvec, int type)
{
struct pci_bus *bus;
+ int ret;
/* MSI must be globally enabled and supported by the device */
if (!pci_msi_enable || !dev || dev->no_msi)
return -EINVAL;
+ /*
+ * 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;
+
/* 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.
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
return -EINVAL;
+ ret = arch_msi_check_device(dev, nvec, type);
+ if (ret)
+ return ret;
+
+ if (!pci_find_capability(dev, type))
+ return -EINVAL;
+
return 0;
}
**/
int pci_enable_msi(struct pci_dev* dev)
{
- int pos, temp, status;
-
- if (pci_msi_supported(dev) < 0)
- return -EINVAL;
-
- temp = dev->irq;
+ int status;
- status = msi_init();
- if (status < 0)
+ status = pci_msi_check_device(dev, 1, PCI_CAP_ID_MSI);
+ if (status)
return status;
- pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (!pos)
- return -EINVAL;
-
- WARN_ON(!msi_lookup_irq(dev, PCI_CAP_ID_MSI));
+ 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 && !msi_lookup_irq(dev, PCI_CAP_ID_MSIX)) {
- printk(KERN_INFO "PCI: %s: Can't enable MSI. "
- "Device already has MSI-X irq assigned\n",
- pci_name(dev));
- dev->irq = temp;
- 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;
}
+EXPORT_SYMBOL(pci_enable_msi);
void pci_disable_msi(struct pci_dev* dev)
{
struct msi_desc *entry;
- int pos, default_irq;
- u16 control;
- unsigned long flags;
+ int default_irq;
- if (!pci_msi_enable)
- return;
- if (!dev)
+ if (!pci_msi_enable || !dev || !dev->msi_enabled)
return;
- pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (!pos)
- return;
+ msi_set_enable(dev, 0);
+ pci_intx(dev, 1); /* enable intx */
+ dev->msi_enabled = 0;
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (!(control & PCI_MSI_FLAGS_ENABLE))
+ BUG_ON(list_empty(&dev->msi_list));
+ entry = list_entry(dev->msi_list.next, struct msi_desc, list);
+ if (!entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) {
return;
+ }
- disable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
+ default_irq = entry->msi_attrib.default_irq;
+ msi_free_irq(dev, entry->irq);
- spin_lock_irqsave(&msi_lock, flags);
- entry = msi_desc[dev->irq];
- if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) {
- spin_unlock_irqrestore(&msi_lock, flags);
- return;
- }
- if (irq_has_action(dev->irq)) {
- spin_unlock_irqrestore(&msi_lock, flags);
- printk(KERN_WARNING "PCI: %s: pci_disable_msi() called without "
- "free_irq() on MSI irq %d\n",
- pci_name(dev), dev->irq);
- BUG_ON(irq_has_action(dev->irq));
- } else {
- default_irq = entry->msi_attrib.default_irq;
- spin_unlock_irqrestore(&msi_lock, flags);
- msi_free_irq(dev, dev->irq);
-
- /* Restore dev->irq to its default pin-assertion irq */
- dev->irq = default_irq;
- }
+ /* Restore dev->irq to its default pin-assertion irq */
+ dev->irq = default_irq;
}
+EXPORT_SYMBOL(pci_disable_msi);
static int msi_free_irq(struct pci_dev* dev, int irq)
{
struct msi_desc *entry;
- int head, entry_nr, type;
+ int entry_nr, type;
void __iomem *base;
- unsigned long flags;
- arch_teardown_msi_irq(irq);
+ BUG_ON(irq_has_action(irq));
- spin_lock_irqsave(&msi_lock, flags);
- entry = msi_desc[irq];
+ entry = get_irq_msi(irq);
if (!entry || entry->dev != dev) {
- spin_unlock_irqrestore(&msi_lock, flags);
return -EINVAL;
}
type = entry->msi_attrib.type;
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;
- entry->dev = NULL;
- msi_desc[irq] = NULL;
- spin_unlock_irqrestore(&msi_lock, flags);
+ list_del(&entry->list);
- destroy_msi_irq(irq);
+ arch_teardown_msi_irq(irq);
+ kfree(entry);
if (type == PCI_CAP_ID_MSIX) {
writel(1, base + entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
- if (head == irq)
+ if (list_empty(&dev->msi_list))
iounmap(base);
}
int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
{
int status, pos, nr_entries;
- int i, j, temp;
+ int i, j;
u16 control;
- if (!entries || pci_msi_supported(dev) < 0)
+ if (!entries)
return -EINVAL;
- status = msi_init();
- if (status < 0)
+ status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX);
+ if (status)
return status;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (!pos)
- return -EINVAL;
-
pci_read_config_word(dev, msi_control_reg(pos), &control);
nr_entries = multi_msix_capable(control);
if (nvec > nr_entries)
return -EINVAL; /* duplicate entry */
}
}
- temp = dev->irq;
- WARN_ON(!msi_lookup_irq(dev, PCI_CAP_ID_MSIX));
+ WARN_ON(!!dev->msix_enabled);
/* Check whether driver already requested for MSI irq */
- if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 &&
- !msi_lookup_irq(dev, PCI_CAP_ID_MSI)) {
+ 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));
- dev->irq = temp;
return -EINVAL;
}
status = msix_capability_init(dev, entries, nvec);
return status;
}
+EXPORT_SYMBOL(pci_enable_msix);
-void pci_disable_msix(struct pci_dev* dev)
+static void msix_free_all_irqs(struct pci_dev *dev)
{
- int pos, temp;
- u16 control;
+ struct msi_desc *entry;
- if (!pci_msi_enable)
- return;
- if (!dev)
- return;
+ list_for_each_entry(entry, &dev->msi_list, list)
+ msi_free_irq(dev, entry->irq);
+}
- pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (!pos)
+void pci_disable_msix(struct pci_dev* dev)
+{
+ if (!pci_msi_enable || !dev || !dev->msix_enabled)
return;
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (!(control & PCI_MSIX_FLAGS_ENABLE))
- return;
+ msix_set_enable(dev, 0);
+ pci_intx(dev, 1); /* enable intx */
+ dev->msix_enabled = 0;
- disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
-
- temp = dev->irq;
- if (!msi_lookup_irq(dev, PCI_CAP_ID_MSIX)) {
- int irq, head, tail = 0, warning = 0;
- unsigned long flags;
-
- irq = head = dev->irq;
- dev->irq = temp; /* Restore pin IRQ */
- while (head != tail) {
- spin_lock_irqsave(&msi_lock, flags);
- tail = msi_desc[irq]->link.tail;
- spin_unlock_irqrestore(&msi_lock, flags);
- if (irq_has_action(irq))
- warning = 1;
- else if (irq != head) /* Release MSI-X irq */
- msi_free_irq(dev, irq);
- irq = tail;
- }
- msi_free_irq(dev, irq);
- if (warning) {
- printk(KERN_WARNING "PCI: %s: pci_disable_msix() called without "
- "free_irq() on all MSI-X irqs\n",
- pci_name(dev));
- BUG_ON(warning > 0);
- }
- }
+ msix_free_all_irqs(dev);
}
+EXPORT_SYMBOL(pci_disable_msix);
/**
* msi_remove_pci_irq_vectors - reclaim MSI(X) irqs to unused state
**/
void msi_remove_pci_irq_vectors(struct pci_dev* dev)
{
- int pos, temp;
- unsigned long flags;
-
if (!pci_msi_enable || !dev)
return;
- temp = dev->irq; /* Save IOAPIC IRQ */
- pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (pos > 0 && !msi_lookup_irq(dev, PCI_CAP_ID_MSI)) {
- if (irq_has_action(dev->irq)) {
- printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
- "called without free_irq() on MSI irq %d\n",
- pci_name(dev), dev->irq);
- BUG_ON(irq_has_action(dev->irq));
- } else /* Release MSI irq assigned to this device */
- msi_free_irq(dev, dev->irq);
- dev->irq = temp; /* Restore IOAPIC IRQ */
- }
- pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (pos > 0 && !msi_lookup_irq(dev, PCI_CAP_ID_MSIX)) {
- int irq, head, tail = 0, warning = 0;
- void __iomem *base = NULL;
-
- irq = head = dev->irq;
- while (head != tail) {
- spin_lock_irqsave(&msi_lock, flags);
- tail = msi_desc[irq]->link.tail;
- base = msi_desc[irq]->mask_base;
- spin_unlock_irqrestore(&msi_lock, flags);
- if (irq_has_action(irq))
- warning = 1;
- else if (irq != head) /* Release MSI-X irq */
- msi_free_irq(dev, irq);
- irq = tail;
- }
- msi_free_irq(dev, irq);
- if (warning) {
- iounmap(base);
- printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
- "called without free_irq() on all MSI-X irqs\n",
- pci_name(dev));
- BUG_ON(warning > 0);
- }
- dev->irq = temp; /* Restore IOAPIC IRQ */
+ if (dev->msi_enabled) {
+ struct msi_desc *entry;
+ BUG_ON(list_empty(&dev->msi_list));
+ entry = list_entry(dev->msi_list.next, struct msi_desc, list);
+ msi_free_irq(dev, entry->irq);
}
+
+ if (dev->msix_enabled)
+ msix_free_all_irqs(dev);
}
void pci_no_msi(void)
pci_msi_enable = 0;
}
-EXPORT_SYMBOL(pci_enable_msi);
-EXPORT_SYMBOL(pci_disable_msi);
-EXPORT_SYMBOL(pci_enable_msix);
-EXPORT_SYMBOL(pci_disable_msix);
+void pci_msi_init_pci_dev(struct pci_dev *dev)
+{
+ INIT_LIST_HEAD(&dev->msi_list);
+}
+
+
+/* Arch hooks */
+
+int __attribute__ ((weak))
+arch_msi_check_device(struct pci_dev* dev, int nvec, int type)
+{
+ return 0;
+}
+
projects / powerpc.git / blobdiff