[RFC PATCH 09/11] PCI/MSI: refactor PCI MSI driver

From: Yijing Wang
Date: Fri Jul 25 2014 - 22:44:26 EST

Use struct msi_ops to hook PCI MSI operations,
and use struct msi_irqs to refactor PCI MSI drvier.

Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
---
drivers/pci/msi.c | 351 ++++++++++++++++++++++++++++++---------------------
include/linux/msi.h | 14 +-
include/linux/pci.h | 11 +-
3 files changed, 222 insertions(+), 154 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 41c33da..f0c5989 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -29,8 +29,9 @@ static int pci_msi_enable = 1;

/* Arch hooks */

-int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
+int __weak arch_setup_msi_irq(struct msi_irqs *msi, struct msi_desc *desc)
{
+ struct pci_dev *dev = msi->data; //TO BE DONE: rework msi_chip to support Non-PCI
struct msi_chip *chip = dev->bus->msi;
int err;

@@ -56,8 +57,9 @@ void __weak arch_teardown_msi_irq(unsigned int irq)
chip->teardown_irq(chip, irq);
}

-int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
+int __weak arch_msi_check_device(struct msi_irqs *msi, int nvec, int type)
{
+ struct pci_dev *dev = msi->data; //TO BE DONE: rework msi_chip to support Non-PCI
struct msi_chip *chip = dev->bus->msi;

if (!chip || !chip->check_device)
@@ -66,7 +68,7 @@ int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
return chip->check_device(chip, dev, nvec, type);
}

-int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+int __weak arch_setup_msi_irqs(struct msi_irqs *msi, int nvec, int type)
{
struct msi_desc *entry;
int ret;
@@ -78,8 +80,8 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
if (type == MSI_TYPE && nvec > 1)
return 1;

- list_for_each_entry(entry, &dev->msi_list, list) {
- ret = arch_setup_msi_irq(dev, entry);
+ list_for_each_entry(entry, &msi->msi_list, list) {
+ ret = arch_setup_msi_irq(msi, entry);
if (ret < 0)
return ret;
if (ret > 0)
@@ -93,11 +95,11 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
* We have a default implementation available as a separate non-weak
* function, as it is used by the Xen x86 PCI code
*/
-void default_teardown_msi_irqs(struct pci_dev *dev)
+void default_teardown_msi_irqs(struct msi_irqs *msi)
{
struct msi_desc *entry;

- list_for_each_entry(entry, &dev->msi_list, list) {
+ list_for_each_entry(entry, &msi->msi_list, list) {
int i, nvec;
if (entry->irq == 0)
continue;
@@ -110,22 +112,22 @@ void default_teardown_msi_irqs(struct pci_dev *dev)
}
}

-void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
+void __weak arch_teardown_msi_irqs(struct msi_irqs *msi)
{
- return default_teardown_msi_irqs(dev);
+ return default_teardown_msi_irqs(msi);
}

-static void default_restore_msi_irq(struct pci_dev *dev, int irq)
+static void default_restore_msi_irq(struct msi_irqs *msi, int irq)
{
struct msi_desc *entry;

entry = NULL;
- if (dev->msix_enabled) {
- list_for_each_entry(entry, &dev->msi_list, list) {
+ if (msi->msix_enabled) {
+ list_for_each_entry(entry, &msi->msi_list, list) {
if (irq == entry->irq)
break;
}
- } else if (pci_dev_msi_enabled(dev, MSI_TYPE)) {
+ } else if (msi->msi_enabled) {
entry = irq_get_msi_desc(irq);
}

@@ -133,20 +135,9 @@ static void default_restore_msi_irq(struct pci_dev *dev, int irq)
write_msi_msg(irq, &entry->msg);
}

-void __weak arch_restore_msi_irqs(struct pci_dev *dev)
+void __weak arch_restore_msi_irqs(struct msi_irqs *msi)
{
- return default_restore_msi_irqs(dev);
-}
-
-static void msi_set_enable(struct pci_dev *dev, int enable)
-{
- u16 control;
-
- pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
- control &= ~PCI_MSI_FLAGS_ENABLE;
- if (enable)
- control |= PCI_MSI_FLAGS_ENABLE;
- pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
+ return default_restore_msi_irqs(msi);
}

static void msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
@@ -159,6 +150,25 @@ static void msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl);
}

+static void msi_set_enable(struct msi_irqs *msi, int enable, int type)
+{
+ u16 control;
+ struct pci_dev *dev = msi->data;
+
+ if (type == MSI_TYPE) {
+ pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
+ control &= ~PCI_MSI_FLAGS_ENABLE;
+ if (enable)
+ control |= PCI_MSI_FLAGS_ENABLE;
+ pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
+ } else if (type == MSIX_TYPE) {
+ if (enable)
+ msix_clear_and_set_ctrl(dev, 0, PCI_MSIX_FLAGS_ENABLE);
+ else
+ msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
+ }
+}
+
static inline __attribute_const__ u32 msi_mask(unsigned x)
{
/* Don't shift by >= width of type */
@@ -175,6 +185,7 @@ static inline __attribute_const__ u32 msi_mask(unsigned x)
*/
u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
{
+ struct pci_dev *dev = desc->msi->data;
u32 mask_bits = desc->masked;

if (!desc->msi_attrib.maskbit)
@@ -182,7 +193,7 @@ u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)

mask_bits &= ~mask;
mask_bits |= flag;
- pci_write_config_dword(desc->dev, desc->mask_pos, mask_bits);
+ pci_write_config_dword(dev, desc->mask_pos, mask_bits);

return mask_bits;
}
@@ -250,18 +261,30 @@ void unmask_msi_irq(struct irq_data *data)
msi_set_mask_bit(data, 0);
}

-void default_restore_msi_irqs(struct pci_dev *dev)
+static void msix_set_all_mask(struct msi_irqs *msi, int flag)
+{
+ struct pci_dev *dev = msi->data;
+
+ if (flag)
+ msix_clear_and_set_ctrl(dev, 0, PCI_MSIX_FLAGS_MASKALL);
+ else
+ msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
+}
+
+void default_restore_msi_irqs(struct msi_irqs *msi)
{
struct msi_desc *entry;

- list_for_each_entry(entry, &dev->msi_list, list) {
- default_restore_msi_irq(dev, entry->irq);
+ list_for_each_entry(entry, &msi->msi_list, list) {
+ default_restore_msi_irq(msi, entry->irq);
}
}

void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
- BUG_ON(entry->dev->current_state != PCI_D0);
+ struct pci_dev *dev = entry->msi->data;
+
+ BUG_ON(dev->current_state != PCI_D0);

if (entry->msi_attrib.is_msix) {
void __iomem *base = entry->mask_base +
@@ -271,7 +294,6 @@ void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR);
msg->data = readl(base + PCI_MSIX_ENTRY_DATA);
} else {
- struct pci_dev *dev = entry->dev;
int pos = dev->msi_cap;
u16 data;

@@ -315,7 +337,9 @@ void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)

void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
- if (entry->dev->current_state != PCI_D0) {
+ struct pci_dev *dev = entry->msi->data;
+
+ if (dev->current_state != PCI_D0) {
/* Don't touch the hardware now */
} else if (entry->msi_attrib.is_msix) {
void __iomem *base;
@@ -326,7 +350,6 @@ void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
} else {
- struct pci_dev *dev = entry->dev;
int pos = dev->msi_cap;
u16 msgctl;

@@ -357,14 +380,34 @@ void write_msi_msg(unsigned int irq, struct msi_msg *msg)
__write_msi_msg(entry, msg);
}

-static void free_msi_irqs(struct pci_dev *dev)
+static void free_msi_sysfs(struct pci_dev *dev)
{
- struct msi_desc *entry, *tmp;
struct attribute **msi_attrs;
struct device_attribute *dev_attr;
int count = 0;

- list_for_each_entry(entry, &dev->msi_list, list) {
+ if (dev->msi_irq_groups) {
+ sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups);
+ msi_attrs = dev->msi_irq_groups[0]->attrs;
+ while (msi_attrs[count]) {
+ dev_attr = container_of(msi_attrs[count],
+ struct device_attribute, attr);
+ kfree(dev_attr->attr.name);
+ kfree(dev_attr);
+ ++count;
+ }
+ kfree(msi_attrs);
+ kfree(dev->msi_irq_groups[0]);
+ kfree(dev->msi_irq_groups);
+ dev->msi_irq_groups = NULL;
+ }
+}
+
+static void free_msi_irqs(struct msi_irqs *msi)
+{
+ struct msi_desc *entry, *tmp;
+
+ list_for_each_entry(entry, &msi->msi_list, list) {
int i, nvec;
if (!entry->irq)
continue;
@@ -376,11 +419,11 @@ static void free_msi_irqs(struct pci_dev *dev)
BUG_ON(irq_has_action(entry->irq + i));
}

- arch_teardown_msi_irqs(dev);
+ arch_teardown_msi_irqs(msi);

- list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
+ list_for_each_entry_safe(entry, tmp, &msi->msi_list, list) {
if (entry->msi_attrib.is_msix) {
- if (list_is_last(&entry->list, &dev->msi_list))
+ if (list_is_last(&entry->list, &msi->msi_list))
iounmap(entry->mask_base);
}

@@ -398,38 +441,24 @@ static void free_msi_irqs(struct pci_dev *dev)
list_del(&entry->list);
kfree(entry);
}
-
- if (dev->msi_irq_groups) {
- sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups);
- msi_attrs = dev->msi_irq_groups[0]->attrs;
- while (msi_attrs[count]) {
- dev_attr = container_of(msi_attrs[count],
- struct device_attribute, attr);
- kfree(dev_attr->attr.name);
- kfree(dev_attr);
- ++count;
- }
- kfree(msi_attrs);
- kfree(dev->msi_irq_groups[0]);
- kfree(dev->msi_irq_groups);
- dev->msi_irq_groups = NULL;
- }
}

-static struct msi_desc *alloc_msi_entry(struct pci_dev *dev)
+static struct msi_desc *alloc_msi_entry(struct msi_irqs *msi)
{
struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
return NULL;

INIT_LIST_HEAD(&desc->list);
- desc->dev = dev;
+ desc->msi = msi;

return desc;
}

-static void pci_intx_for_msi(struct pci_dev *dev, int enable)
+static void pci_intx_for_msi(struct msi_irqs *msi, int enable)
{
+ struct pci_dev *dev = msi->data;
+
if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG))
pci_intx(dev, enable);
}
@@ -444,9 +473,9 @@ static void __pci_restore_msi_state(struct pci_dev *dev)

entry = irq_get_msi_desc(dev->irq);

- pci_intx_for_msi(dev, 0);
- msi_set_enable(dev, 0);
- arch_restore_msi_irqs(dev);
+ pci_intx_for_msi(dev->msi, 0);
+ msi_set_enable(dev->msi, 0, MSI_TYPE);
+ arch_restore_msi_irqs(dev->msi);

pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
msi_mask_irq(entry, msi_mask(entry->msi_attrib.multi_cap),
@@ -459,22 +488,21 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
static void __pci_restore_msix_state(struct pci_dev *dev)
{
struct msi_desc *entry;
+ struct msi_irqs *msi = dev->msi;

- if (!dev->msix_enabled)
+ if (!pci_dev_msi_enabled(dev, MSIX_TYPE))
return;
- BUG_ON(list_empty(&dev->msi_list));
+ BUG_ON(list_empty(&msi->msi_list));

/* route the table */
- pci_intx_for_msi(dev, 0);
- msix_clear_and_set_ctrl(dev, 0,
- PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL);
-
- arch_restore_msi_irqs(dev);
- list_for_each_entry(entry, &dev->msi_list, list) {
+ pci_intx_for_msi(msi, 0);
+ msi_set_enable(msi, 1, MSIX_TYPE);
+ msix_set_all_mask(msi, 1);
+ arch_restore_msi_irqs(msi);
+ list_for_each_entry(entry, &msi->msi_list, list)
msix_mask_irq(entry, entry->masked);
- }

- msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
+ msix_set_all_mask(msi, 0);
}

void pci_restore_msi_state(struct pci_dev *dev)
@@ -516,7 +544,7 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
int count = 0;

/* Determine how many msi entries we have */
- list_for_each_entry(entry, &pdev->msi_list, list) {
+ list_for_each_entry(entry, &pdev->msi->msi_list, list) {
++num_msi;
}
if (!num_msi)
@@ -526,7 +554,7 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
msi_attrs = kzalloc(sizeof(void *) * (num_msi + 1), GFP_KERNEL);
if (!msi_attrs)
return -ENOMEM;
- list_for_each_entry(entry, &pdev->msi_list, list) {
+ list_for_each_entry(entry, &pdev->msi->msi_list, list) {
msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
if (!msi_dev_attr)
goto error_attrs;
@@ -578,13 +606,14 @@ error_attrs:
return ret;
}

-static struct msi_desc *msi_setup_entry(struct pci_dev *dev)
+static struct msi_desc *msi_setup_entry(struct msi_irqs *msi)
{
u16 control;
struct msi_desc *entry;
+ struct pci_dev *dev = msi->data;

/* MSI Entry Initialization */
- entry = alloc_msi_entry(dev);
+ entry = alloc_msi_entry(msi);
if (!entry)
return NULL;

@@ -620,15 +649,15 @@ static struct msi_desc *msi_setup_entry(struct pci_dev *dev)
* 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)
+static int msi_capability_init(struct msi_irqs *msi, int nvec)
{
struct msi_desc *entry;
int ret;
unsigned mask;

- msi_set_enable(dev, 0); /* Disable MSI during set up */
+ msi_set_enable(msi, 0, MSI_TYPE); /* Disable MSI during set up */

- entry = msi_setup_entry(dev);
+ entry = msi_setup_entry(msi);
if (!entry)
return -ENOMEM;

@@ -636,21 +665,23 @@ static int msi_capability_init(struct pci_dev *dev, int nvec)
mask = msi_mask(entry->msi_attrib.multi_cap);
msi_mask_irq(entry, mask, mask);

- list_add_tail(&entry->list, &dev->msi_list);
+ list_add_tail(&entry->list, &msi->msi_list);

/* Configure MSI capability structure */
- ret = arch_setup_msi_irqs(dev, nvec, MSI_TYPE);
- if (ret) {
- msi_mask_irq(entry, mask, ~mask);
- free_msi_irqs(dev);
- return ret;
- }
+ ret = arch_setup_msi_irqs(msi, nvec, MSI_TYPE);
+ if (ret)
+ goto err;

/* Set MSI enabled bits */
- pci_intx_for_msi(dev, 0);
- msi_set_enable(dev, 1);
- dev->msi_enabled = 1;
+ pci_intx_for_msi(msi, 0);
+ msi_set_enable(msi, 1, MSI_TYPE);
+ msi->msi_enabled = 1;
return 0;
+
+err:
+ msi_mask_irq(entry, mask, ~mask);
+ free_msi_irqs(msi);
+ return ret;
}

static void __iomem *msix_map_region(struct pci_dev *dev, unsigned nr_entries)
@@ -668,19 +699,20 @@ static void __iomem *msix_map_region(struct pci_dev *dev, unsigned nr_entries)
return ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
}

-static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
+static int msix_setup_entries(struct msi_irqs *msi, void __iomem *base,
struct msix_entry *entries, int nvec)
{
struct msi_desc *entry;
int i, offset;
+ struct pci_dev *dev = msi->data;

for (i = 0; i < nvec; i++) {
- entry = alloc_msi_entry(dev);
+ entry = alloc_msi_entry(msi);
if (!entry) {
if (!i)
iounmap(base);
else
- free_msi_irqs(dev);
+ free_msi_irqs(msi);
/* No enough memory. Don't try again */
return -ENOMEM;
}
@@ -688,7 +720,6 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
entry->msi_attrib.is_msix = 1;
entry->msi_attrib.is_64 = 1;
entry->msi_attrib.entry_nr = entries[i].entry;
- entry->msi_attrib.default_irq = dev->irq;
entry->mask_base = base;

msix_clear_and_set_ctrl(dev, 0,
@@ -700,19 +731,19 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
msix_clear_and_set_ctrl(dev,
PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE, 0);

- list_add_tail(&entry->list, &dev->msi_list);
+ list_add_tail(&entry->list, &msi->msi_list);
}

return 0;
}

-static void msix_program_entries(struct pci_dev *dev,
+static void msix_program_entries(struct msi_irqs *msi,
struct msix_entry *entries)
{
struct msi_desc *entry;
int i = 0;

- list_for_each_entry(entry, &dev->msi_list, list) {
+ list_for_each_entry(entry, &msi->msi_list, list) {
entries[i].vector = entry->irq;
irq_set_msi_desc(entry->irq, entry);
i++;
@@ -729,19 +760,19 @@ static void msix_program_entries(struct pci_dev *dev,
* 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.
**/
-static int msix_capability_init(struct pci_dev *dev, void __iomem *base,
+static int msix_capability_init(struct msi_irqs *msi, void __iomem *base,
struct msix_entry *entries, int nvec)
{
int ret;

/* Ensure MSI-X is disabled while it is set up */
- msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
+ msi_set_enable(msi, 0, MSIX_TYPE);

- ret = msix_setup_entries(dev, base, entries, nvec);
+ ret = msix_setup_entries(msi, base, entries, nvec);
if (ret)
return ret;

- ret = arch_setup_msi_irqs(dev, nvec, MSIX_TYPE);
+ ret = arch_setup_msi_irqs(msi, nvec, MSIX_TYPE);
if (ret)
goto out_avail;

@@ -750,13 +781,13 @@ static int msix_capability_init(struct pci_dev *dev, void __iomem *base,
* MSI-X registers. We need to mask all the vectors to prevent
* interrupts coming in before they're fully set up.
*/
- msix_program_entries(dev, entries);
+ msix_program_entries(msi, entries);

/* Set MSI-X enabled bits and unmask the function */
- pci_intx_for_msi(dev, 0);
- dev->msix_enabled = 1;
+ pci_intx_for_msi(msi, 0);
+ msi->msix_enabled = 1;

- msix_clear_and_set_ctrl(dev, 0, PCI_MSIX_FLAGS_ENABLE);
+ msi_set_enable(msi, 1, MSIX_TYPE);

return 0;

@@ -769,7 +800,7 @@ out_avail:
struct msi_desc *entry;
int avail = 0;

- list_for_each_entry(entry, &dev->msi_list, list) {
+ list_for_each_entry(entry, &msi->msi_list, list) {
if (entry->irq != 0)
avail++;
}
@@ -777,7 +808,7 @@ out_avail:
ret = avail;
}

- free_msi_irqs(dev);
+ free_msi_irqs(msi);

return ret;
}
@@ -820,7 +851,7 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type)
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
return -EINVAL;

- ret = arch_msi_check_device(dev, nvec, type);
+ ret = arch_msi_check_device(dev->msi, nvec, type);
if (ret)
return ret;

@@ -861,12 +892,12 @@ void pci_msi_shutdown(struct pci_dev *dev)
!pci_dev_msi_enabled(dev, MSI_TYPE))
return;

- BUG_ON(list_empty(&dev->msi_list));
- desc = list_first_entry(&dev->msi_list, struct msi_desc, list);
+ BUG_ON(list_empty(&dev->msi->msi_list));
+ desc = list_first_entry(&dev->msi->msi_list, struct msi_desc, list);

- msi_set_enable(dev, 0);
- pci_intx_for_msi(dev, 1);
- dev->msi_enabled = 0;
+ msi_set_enable(dev->msi, 0, MSI_TYPE);
+ pci_intx_for_msi(dev->msi, 1);
+ dev->msi->msi_enabled = 0;

/* Return the device with MSI unmasked as initial states */
mask = msi_mask(desc->msi_attrib.multi_cap);
@@ -884,7 +915,8 @@ void pci_disable_msi(struct pci_dev *dev)
return;

pci_msi_shutdown(dev);
- free_msi_irqs(dev);
+ free_msi_irqs(dev->msi);
+ free_msi_sysfs(dev);
}
EXPORT_SYMBOL(pci_disable_msi);

@@ -930,9 +962,10 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
void __iomem *base;
u16 control;

- if (!entries || !dev->msix_cap || dev->current_state != PCI_D0)
+ if (!entries || !dev->msix_cap || !dev->msi
+ || dev->current_state != PCI_D0)
return -EINVAL;
-
+
status = pci_msi_check_device(dev, nvec, MSIX_TYPE);
if (status)
return status;
@@ -952,7 +985,7 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
return -EINVAL; /* duplicate entry */
}
}
- WARN_ON(!!dev->msix_enabled);
+ WARN_ON(!!pci_dev_msi_enabled(dev, MSIX_TYPE));

/* Check whether driver already requested for MSI irq */
if (pci_dev_msi_enabled(dev, MSI_TYPE)) {
@@ -966,13 +999,13 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
if (!base)
return -ENOMEM;

- status = msix_capability_init(dev, base, entries, nvec);
+ status = msix_capability_init(dev->msi, base, entries, nvec);
if (!status) {
ret = populate_msi_sysfs(dev);
if (ret) {
- dev->msix_enabled = 0;
- pci_intx_for_msi(dev, 1);
- free_msi_irqs(dev);
+ dev->msi->msix_enabled = 0;
+ pci_intx_for_msi(dev->msi, 1);
+ free_msi_irqs(dev->msi);
}
}
return status;
@@ -983,18 +1016,18 @@ void pci_msix_shutdown(struct pci_dev *dev)
{
struct msi_desc *entry;

- if (!pci_msi_enable || !dev || !dev->msix_enabled)
+ if (!pci_msi_enable || !dev || !pci_dev_msi_enabled(dev, MSIX_TYPE))
return;

/* Return the device with MSI-X masked as initial states */
- list_for_each_entry(entry, &dev->msi_list, list) {
+ list_for_each_entry(entry, &dev->msi->msi_list, list) {
/* Keep cached states to be restored */
arch_msix_mask_irq(entry, 1);
}

- msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
- pci_intx_for_msi(dev, 1);
- dev->msix_enabled = 0;
+ msi_set_enable(dev->msi, 0, MSIX_TYPE);
+ pci_intx_for_msi(dev->msi, 1);
+ dev->msi->msix_enabled = 0;
}

void pci_disable_msix(struct pci_dev *dev)
@@ -1004,7 +1037,8 @@ void pci_disable_msix(struct pci_dev *dev)
return;

pci_msix_shutdown(dev);
- free_msi_irqs(dev);
+ free_msi_irqs(dev->msi);
+ free_msi_sysfs(dev);
}
EXPORT_SYMBOL(pci_disable_msix);

@@ -1025,21 +1059,52 @@ int pci_msi_enabled(void)
}
EXPORT_SYMBOL(pci_msi_enabled);

-void pci_msi_init_pci_dev(struct pci_dev *dev)
+static struct msi_ops pci_msi = {
+ .msi_set_enable = msi_set_enable,
+ .msi_setup_entry = msi_setup_entry,
+ .msix_setup_entries = msix_setup_entries,
+ .msi_mask_irq = default_msi_mask_irq,
+ .msix_mask_irq = default_msix_mask_irq,
+ .msi_read_message = __read_msi_msg,
+ .msi_write_message = __write_msi_msg,
+ .msi_set_intx = pci_intx_for_msi,
+};
+
+struct msi_irqs *alloc_msi_irqs(void *data, struct msi_ops *ops)
{
- INIT_LIST_HEAD(&dev->msi_list);
+ struct msi_irqs *msi;
+
+ msi = kzalloc(sizeof(struct msi_irqs), GFP_KERNEL);
+ if (!msi)
+ return NULL;

+ INIT_LIST_HEAD(&msi->msi_list);
+ msi->data = data;
+ msi->ops = ops;
+ return msi;
+}
+
+void pci_msi_init_pci_dev(struct pci_dev *dev)
+{
/* Disable the msi hardware to avoid screaming interrupts
* during boot. This is the power on reset default so
* usually this should be a noop.
*/
dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (dev->msi_cap)
- msi_set_enable(dev, 0);
-
dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (dev->msix_cap)
- msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
+
+ if (dev->msi_cap || dev->msix_cap) {
+ dev->msi = alloc_msi_irqs(dev, &pci_msi);
+ if (!dev->msi)
+ return;
+
+ dev->msi->node = dev_to_node(&dev->dev);
+ if (dev->msi_cap)
+ msi_set_enable(dev->msi, 0, MSI_TYPE);
+
+ if (dev->msix_cap)
+ msi_set_enable(dev->msi, 0, MSIX_TYPE);
+ }
}

/**
@@ -1060,13 +1125,13 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
int rc;
struct msi_desc *entry;

- if (dev->current_state != PCI_D0)
+ if (dev->current_state != PCI_D0 || !dev->msi)
return -EINVAL;

- WARN_ON(!!dev->msi_enabled);
+ WARN_ON(!!pci_dev_msi_enabled(dev, MSI_TYPE));

/* Check whether driver already requested MSI-X irqs */
- if (dev->msix_enabled) {
+ if (pci_dev_msi_enabled(dev, MSIX_TYPE)) {
dev_info(&dev->dev,
"can't enable MSI (MSI-X already enabled)\n");
return -EINVAL;
@@ -1095,7 +1160,7 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
} while (rc);

do {
- rc = msi_capability_init(dev, nvec);
+ rc = msi_capability_init(dev->msi, nvec);
if (rc < 0) {
return rc;
} else if (rc > 0) {
@@ -1107,14 +1172,14 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)

rc = populate_msi_sysfs(dev);
if (rc) {
- msi_set_enable(dev, 0);
- pci_intx_for_msi(dev, 1);
- dev->msi_enabled = 0;
- free_msi_irqs(dev);
+ msi_set_enable(dev->msi, 0, MSI_TYPE);
+ pci_intx_for_msi(dev->msi, 1);
+ dev->msi->msi_enabled = 0;
+ free_msi_irqs(dev->msi);
return rc;
}

- entry = list_entry(dev->msi_list.next, struct msi_desc, list);
+ entry = list_entry(dev->msi->msi_list.next, struct msi_desc, list);
dev->irq = entry->irq;
return nvec;
}
@@ -1158,3 +1223,5 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
return nvec;
}
EXPORT_SYMBOL(pci_enable_msix_range);
+
+
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 5a672d3..fc8f3e8 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -83,15 +83,15 @@ struct msi_desc {
* implemented as weak symbols so that they /can/ be overriden by
* architecture specific code if needed.
*/
-int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
+int arch_setup_msi_irq(struct msi_irqs *msi, struct msi_desc *desc);
void arch_teardown_msi_irq(unsigned int irq);
-int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
-void arch_teardown_msi_irqs(struct pci_dev *dev);
-int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
-void arch_restore_msi_irqs(struct pci_dev *dev);
+int arch_setup_msi_irqs(struct msi_irqs *msi, int nvec, int type);
+void arch_teardown_msi_irqs(struct msi_irqs *msi);
+int arch_msi_check_device(struct msi_irqs *msi, int nvec, int type);
+void arch_restore_msi_irqs(struct msi_irqs *msi);

-void default_teardown_msi_irqs(struct pci_dev *dev);
-void default_restore_msi_irqs(struct pci_dev *dev);
+void default_teardown_msi_irqs(struct msi_irqs *msi);
+void default_restore_msi_irqs(struct msi_irqs *msi);
u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag);

diff --git a/include/linux/pci.h b/include/linux/pci.h
index c7bca1c..d7126fc 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -334,8 +334,6 @@ struct pci_dev {
unsigned int block_cfg_access:1; /* config space access is blocked */
unsigned int broken_parity_status:1; /* Device generates false positive parity */
unsigned int irq_reroute_variant:2; /* device needs IRQ rerouting variant */
- unsigned int msi_enabled:1;
- unsigned int msix_enabled:1;
unsigned int ari_enabled:1; /* ARI forwarding */
unsigned int is_managed:1;
unsigned int needs_freset:1; /* Dev requires fundamental reset */
@@ -358,7 +356,7 @@ struct pci_dev {
struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */
#ifdef CONFIG_PCI_MSI
- struct list_head msi_list;
+ struct msi_irqs *msi;
const struct attribute_group **msi_irq_groups;
#endif
struct pci_vpd *vpd;
@@ -510,11 +508,14 @@ static inline struct pci_dev *pci_upstream_bridge(struct pci_dev *dev)
static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev, int type)
{
bool enabled = 0;
+
+ if (!pci_dev->msi)
+ return false;

if (type & MSI_TYPE)
- enabled |= pci_dev->msi_enabled;
+ enabled |= pci_dev->msi->msi_enabled;
if (type & MSIX_TYPE)
- enabled |= pci_dev->msix_enabled;
+ enabled |= pci_dev->msi->msix_enabled;

return enabled;
}
--
1.7.1

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