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Subject[PATCH V2 4/4] genirq/affinity: Document .calc_sets as required in case of multiple sets
Date
Now NVMe has implemented the .calc_sets callback for caculating each
set's vectors.

For other cases of multiple irq sets, it isn't a good way to pre-caculate
each set's vectors before allocating IRQ vectors because NVMe's same issue
exists too.

Document .calc_sets as required explicitly for multiple sets.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/pci/msi.c | 4 ++--
include/linux/interrupt.h | 3 ++-
2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 4c0b47867258..9f91fa713141 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1039,7 +1039,7 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
* If the caller is passing in sets, we can't support a range of
* vectors. The caller needs to handle that.
*/
- if (affd && affd->nr_sets && minvec != maxvec)
+ if (affd && affd->nr_sets > 1 && !affd->calc_sets)
return -EINVAL;

if (WARN_ON_ONCE(dev->msi_enabled))
@@ -1097,7 +1097,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
* If the caller is passing in sets, we can't support a range of
* supported vectors. The caller needs to handle that.
*/
- if (affd && affd->nr_sets && minvec != maxvec)
+ if (affd && affd->nr_sets > 1 && !affd->calc_sets)
return -EINVAL;

if (WARN_ON_ONCE(dev->msix_enabled))
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 7a27f6ba1f2f..a053f7fb0ff1 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -269,7 +269,8 @@ struct irq_affinity_notify {
* the MSI(-X) vector space
* @nr_sets: Length of passed in *sets array
* @set_vectors: Number of affinitized sets
- * @calc_sets: Callback for caculating set vectors
+ * @calc_sets: Callback for caculating set vectors, required for
+ * multiple irq sets.
* @priv: Private data of @calc_sets
*/
struct irq_affinity {
--
2.9.5
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