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Merge branch 'irq/for-block' into irq/core

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Add the new irq spreading infrastructure.
This commit is contained in:
Thomas Gleixner
2016-09-15 20:54:40 +02:00
parent 16217dc79d ee8d41e53e
commit 0a30d69195
9 changed files with 295 additions and 125 deletions
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159
drivers/pci/msi.c
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@@ -550,15 +550,23 @@ error_attrs:
return ret;
}
static struct msi_desc *msi_setup_entry(struct pci_dev *dev, int nvec)
static struct msi_desc *
msi_setup_entry(struct pci_dev *dev, int nvec, bool affinity)
{
u16 control;
struct cpumask *masks = NULL;
struct msi_desc *entry;
u16 control;
if (affinity) {
masks = irq_create_affinity_masks(dev->irq_affinity, nvec);
if (!masks)
pr_err("Unable to allocate affinity masks, ignoring\n");
}
/* MSI Entry Initialization */
entry = alloc_msi_entry(&dev->dev);
entry = alloc_msi_entry(&dev->dev, nvec, masks);
if (!entry)
return NULL;
goto out;
pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
@@ -569,8 +577,6 @@ static struct msi_desc *msi_setup_entry(struct pci_dev *dev, int nvec)
entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
entry->msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1;
entry->msi_attrib.multiple = ilog2(__roundup_pow_of_two(nvec));
entry->nvec_used = nvec;
entry->affinity = dev->irq_affinity;
if (control & PCI_MSI_FLAGS_64BIT)
entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_64;
@@ -581,6 +587,8 @@ static struct msi_desc *msi_setup_entry(struct pci_dev *dev, int nvec)
if (entry->msi_attrib.maskbit)
pci_read_config_dword(dev, entry->mask_pos, &entry->masked);
out:
kfree(masks);
return entry;
}
@@ -609,7 +617,7 @@ static int msi_verify_entries(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 pci_dev *dev, int nvec, bool affinity)
{
struct msi_desc *entry;
int ret;
@@ -617,7 +625,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec)
pci_msi_set_enable(dev, 0); /* Disable MSI during set up */
entry = msi_setup_entry(dev, nvec);
entry = msi_setup_entry(dev, nvec, affinity);
if (!entry)
return -ENOMEM;
@@ -680,28 +688,29 @@ static void __iomem *msix_map_region(struct pci_dev *dev, unsigned nr_entries)
}
static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
struct msix_entry *entries, int nvec)
struct msix_entry *entries, int nvec,
bool affinity)
{
const struct cpumask *mask = NULL;
struct cpumask *curmsk, *masks = NULL;
struct msi_desc *entry;
int cpu = -1, i;
int ret, i;
for (i = 0; i < nvec; i++) {
if (dev->irq_affinity) {
cpu = cpumask_next(cpu, dev->irq_affinity);
if (cpu >= nr_cpu_ids)
cpu = cpumask_first(dev->irq_affinity);
mask = cpumask_of(cpu);
}
if (affinity) {
masks = irq_create_affinity_masks(dev->irq_affinity, nvec);
if (!masks)
pr_err("Unable to allocate affinity masks, ignoring\n");
}
entry = alloc_msi_entry(&dev->dev);
for (i = 0, curmsk = masks; i < nvec; i++) {
entry = alloc_msi_entry(&dev->dev, 1, curmsk);
if (!entry) {
if (!i)
iounmap(base);
else
free_msi_irqs(dev);
/* No enough memory. Don't try again */
return -ENOMEM;
ret = -ENOMEM;
goto out;
}
entry->msi_attrib.is_msix = 1;
@@ -712,12 +721,14 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
entry->msi_attrib.entry_nr = i;
entry->msi_attrib.default_irq = dev->irq;
entry->mask_base = base;
entry->nvec_used = 1;
entry->affinity = mask;
list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
if (masks)
curmsk++;
}
ret = 0;
out:
kfree(masks);
return 0;
}
@@ -746,8 +757,8 @@ 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,
struct msix_entry *entries, int nvec)
static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
int nvec, bool affinity)
{
int ret;
u16 control;
@@ -762,7 +773,7 @@ static int msix_capability_init(struct pci_dev *dev,
if (!base)
return -ENOMEM;
ret = msix_setup_entries(dev, base, entries, nvec);
ret = msix_setup_entries(dev, base, entries, nvec, affinity);
if (ret)
return ret;
@@ -942,22 +953,8 @@ int pci_msix_vec_count(struct pci_dev *dev)
}
EXPORT_SYMBOL(pci_msix_vec_count);
/**
* pci_enable_msix - configure device's MSI-X capability structure
* @dev: pointer to the pci_dev data structure of MSI-X device function
* @entries: pointer to an array of MSI-X entries (optional)
* @nvec: number of MSI-X irqs requested for allocation by device driver
*
* Setup the MSI-X capability structure of device function with the number
* of requested irqs upon its software driver call to request for
* MSI-X mode enabled on its hardware device function. A return of zero
* indicates the successful configuration of MSI-X capability structure
* with new allocated MSI-X irqs. A return of < 0 indicates a failure.
* Or a return of > 0 indicates that driver request is exceeding the number
* of irqs or MSI-X vectors available. Driver should use the returned value to
* re-send its request.
**/
int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
int nvec, bool affinity)
{
int nr_entries;
int i, j;
@@ -989,7 +986,27 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
dev_info(&dev->dev, "can't enable MSI-X (MSI IRQ already assigned)\n");
return -EINVAL;
}
return msix_capability_init(dev, entries, nvec);
return msix_capability_init(dev, entries, nvec, affinity);
}
/**
* pci_enable_msix - configure device's MSI-X capability structure
* @dev: pointer to the pci_dev data structure of MSI-X device function
* @entries: pointer to an array of MSI-X entries (optional)
* @nvec: number of MSI-X irqs requested for allocation by device driver
*
* Setup the MSI-X capability structure of device function with the number
* of requested irqs upon its software driver call to request for
* MSI-X mode enabled on its hardware device function. A return of zero
* indicates the successful configuration of MSI-X capability structure
* with new allocated MSI-X irqs. A return of < 0 indicates a failure.
* Or a return of > 0 indicates that driver request is exceeding the number
* of irqs or MSI-X vectors available. Driver should use the returned value to
* re-send its request.
**/
int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
{
return __pci_enable_msix(dev, entries, nvec, false);
}
EXPORT_SYMBOL(pci_enable_msix);
@@ -1042,6 +1059,7 @@ EXPORT_SYMBOL(pci_msi_enabled);
static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
unsigned int flags)
{
bool affinity = flags & PCI_IRQ_AFFINITY;
int nvec;
int rc;
@@ -1070,19 +1088,17 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
nvec = maxvec;
for (;;) {
if (flags & PCI_IRQ_AFFINITY) {
dev->irq_affinity = irq_create_affinity_mask(&nvec);
if (affinity) {
nvec = irq_calc_affinity_vectors(dev->irq_affinity,
nvec);
if (nvec < minvec)
return -ENOSPC;
}
rc = msi_capability_init(dev, nvec);
rc = msi_capability_init(dev, nvec, affinity);
if (rc == 0)
return nvec;
kfree(dev->irq_affinity);
dev->irq_affinity = NULL;
if (rc < 0)
return rc;
if (rc < minvec)
@@ -1114,26 +1130,24 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
struct msix_entry *entries, int minvec, int maxvec,
unsigned int flags)
{
int nvec = maxvec;
int rc;
bool affinity = flags & PCI_IRQ_AFFINITY;
int rc, nvec = maxvec;
if (maxvec < minvec)
return -ERANGE;
for (;;) {
if (flags & PCI_IRQ_AFFINITY) {
dev->irq_affinity = irq_create_affinity_mask(&nvec);
if (affinity) {
nvec = irq_calc_affinity_vectors(dev->irq_affinity,
nvec);
if (nvec < minvec)
return -ENOSPC;
}
rc = pci_enable_msix(dev, entries, nvec);
rc = __pci_enable_msix(dev, entries, nvec, affinity);
if (rc == 0)
return nvec;
kfree(dev->irq_affinity);
dev->irq_affinity = NULL;
if (rc < 0)
return rc;
if (rc < minvec)
@@ -1257,6 +1271,37 @@ int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
}
EXPORT_SYMBOL(pci_irq_vector);
/**
* pci_irq_get_affinity - return the affinity of a particular msi vector
* @dev: PCI device to operate on
* @nr: device-relative interrupt vector index (0-based).
*/
const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
{
if (dev->msix_enabled) {
struct msi_desc *entry;
int i = 0;
for_each_pci_msi_entry(entry, dev) {
if (i == nr)
return entry->affinity;
i++;
}
WARN_ON_ONCE(1);
return NULL;
} else if (dev->msi_enabled) {
struct msi_desc *entry = first_pci_msi_entry(dev);
if (WARN_ON_ONCE(!entry || nr >= entry->nvec_used))
return NULL;
return &entry->affinity[nr];
} else {
return cpu_possible_mask;
}
}
EXPORT_SYMBOL(pci_irq_get_affinity);
struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
{
return to_pci_dev(desc->dev);