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Message-Id: <1478544462-9549-5-git-send-email-hch@lst.de>
Date: Mon, 7 Nov 2016 10:47:39 -0800
From: Christoph Hellwig <hch@....de>
To: tglx@...utronix.de
Cc: axboe@...nel.dk, linux-block@...r.kernel.org,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
Christogh Hellwig <hch@....de>
Subject: [PATCH 4/7] pci/msi: Propagate irq affinity description through the MSI code
From: Christogh Hellwig <hch@....de>
No API change yet, just pass it down all the way from
pci_alloc_irq_vectors to the core MSI code.
Signed-off-by: Christogh Hellwig <hch@....de>
---
drivers/pci/msi.c | 62 +++++++++++++++++++++++++++++--------------------------
1 file changed, 33 insertions(+), 29 deletions(-)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 1761b8a..512f388 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -551,14 +551,14 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
}
static struct msi_desc *
-msi_setup_entry(struct pci_dev *dev, int nvec, bool affinity)
+msi_setup_entry(struct pci_dev *dev, int nvec, const struct irq_affinity *affd)
{
struct cpumask *masks = NULL;
struct msi_desc *entry;
u16 control;
- if (affinity) {
- masks = irq_create_affinity_masks(nvec, NULL);
+ if (affd) {
+ masks = irq_create_affinity_masks(nvec, affd);
if (!masks)
pr_err("Unable to allocate affinity masks, ignoring\n");
}
@@ -618,7 +618,8 @@ 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, bool affinity)
+static int msi_capability_init(struct pci_dev *dev, int nvec,
+ const struct irq_affinity *affd)
{
struct msi_desc *entry;
int ret;
@@ -626,7 +627,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec, bool affinity)
pci_msi_set_enable(dev, 0); /* Disable MSI during set up */
- entry = msi_setup_entry(dev, nvec, affinity);
+ entry = msi_setup_entry(dev, nvec, affd);
if (!entry)
return -ENOMEM;
@@ -690,14 +691,14 @@ 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,
- bool affinity)
+ const struct irq_affinity *affd)
{
struct cpumask *curmsk, *masks = NULL;
struct msi_desc *entry;
int ret, i;
- if (affinity) {
- masks = irq_create_affinity_masks(nvec, NULL);
+ if (affd) {
+ masks = irq_create_affinity_masks(nvec, affd);
if (!masks)
pr_err("Unable to allocate affinity masks, ignoring\n");
}
@@ -753,14 +754,14 @@ static void msix_program_entries(struct pci_dev *dev,
* @dev: pointer to the pci_dev data structure of MSI-X device function
* @entries: pointer to an array of struct msix_entry entries
* @nvec: number of @entries
- * @affinity: flag to indicate cpu irq affinity mask should be set
+ * @affd: Optional pointer to enable automatic affinity assignement
*
* Setup the MSI-X capability structure of device function with a
* 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, bool affinity)
+ int nvec, const struct irq_affinity *affd)
{
int ret;
u16 control;
@@ -775,7 +776,7 @@ static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
if (!base)
return -ENOMEM;
- ret = msix_setup_entries(dev, base, entries, nvec, affinity);
+ ret = msix_setup_entries(dev, base, entries, nvec, affd);
if (ret)
return ret;
@@ -956,7 +957,7 @@ int pci_msix_vec_count(struct pci_dev *dev)
EXPORT_SYMBOL(pci_msix_vec_count);
static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
- int nvec, bool affinity)
+ int nvec, const struct irq_affinity *affd)
{
int nr_entries;
int i, j;
@@ -988,7 +989,7 @@ static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
dev_info(&dev->dev, "can't enable MSI-X (MSI IRQ already assigned)\n");
return -EINVAL;
}
- return msix_capability_init(dev, entries, nvec, affinity);
+ return msix_capability_init(dev, entries, nvec, affd);
}
/**
@@ -1008,7 +1009,7 @@ static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
**/
int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
{
- return __pci_enable_msix(dev, entries, nvec, false);
+ return __pci_enable_msix(dev, entries, nvec, NULL);
}
EXPORT_SYMBOL(pci_enable_msix);
@@ -1059,9 +1060,8 @@ int pci_msi_enabled(void)
EXPORT_SYMBOL(pci_msi_enabled);
static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
- unsigned int flags)
+ const struct irq_affinity *affd)
{
- bool affinity = flags & PCI_IRQ_AFFINITY;
int nvec;
int rc;
@@ -1090,13 +1090,13 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
nvec = maxvec;
for (;;) {
- if (affinity) {
- nvec = irq_calc_affinity_vectors(nvec, NULL);
+ if (affd) {
+ nvec = irq_calc_affinity_vectors(nvec, affd);
if (nvec < minvec)
return -ENOSPC;
}
- rc = msi_capability_init(dev, nvec, affinity);
+ rc = msi_capability_init(dev, nvec, affd);
if (rc == 0)
return nvec;
@@ -1123,28 +1123,27 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
**/
int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
{
- return __pci_enable_msi_range(dev, minvec, maxvec, 0);
+ return __pci_enable_msi_range(dev, minvec, maxvec, NULL);
}
EXPORT_SYMBOL(pci_enable_msi_range);
static int __pci_enable_msix_range(struct pci_dev *dev,
- struct msix_entry *entries, int minvec, int maxvec,
- unsigned int flags)
+ struct msix_entry *entries, int minvec,
+ int maxvec, const struct irq_affinity *affd)
{
- bool affinity = flags & PCI_IRQ_AFFINITY;
int rc, nvec = maxvec;
if (maxvec < minvec)
return -ERANGE;
for (;;) {
- if (affinity) {
- nvec = irq_calc_affinity_vectors(nvec, NULL);
+ if (affd) {
+ nvec = irq_calc_affinity_vectors(nvec, affd);
if (nvec < minvec)
return -ENOSPC;
}
- rc = __pci_enable_msix(dev, entries, nvec, affinity);
+ rc = __pci_enable_msix(dev, entries, nvec, affd);
if (rc == 0)
return nvec;
@@ -1175,7 +1174,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
int minvec, int maxvec)
{
- return __pci_enable_msix_range(dev, entries, minvec, maxvec, 0);
+ return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL);
}
EXPORT_SYMBOL(pci_enable_msix_range);
@@ -1199,17 +1198,22 @@ EXPORT_SYMBOL(pci_enable_msix_range);
int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
unsigned int max_vecs, unsigned int flags)
{
+ static const struct irq_affinity msi_default_affd;
+ const struct irq_affinity *affd = NULL;
int vecs = -ENOSPC;
+ if (flags & PCI_IRQ_AFFINITY)
+ affd = &msi_default_affd;
+
if (flags & PCI_IRQ_MSIX) {
vecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
- flags);
+ affd);
if (vecs > 0)
return vecs;
}
if (flags & PCI_IRQ_MSI) {
- vecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, flags);
+ vecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, affd);
if (vecs > 0)
return vecs;
}
--
2.1.4
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