linux-kernel - [PATCH 01/15] PCI: add shorthand define for message signalled interrupt types

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Date:   Tue,  2 Jun 2020 11:17:06 +0200
From:   Piotr Stankiewicz <piotr.stankiewicz@...el.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-pci@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Piotr Stankiewicz <piotr.stankiewicz@...el.com>
Subject: [PATCH 01/15] PCI: add shorthand define for message signalled interrupt types

There are several places in the kernel which check/ask for MSI or MSI-X
interrupts. It would make sense to have a shorthand constant, similar to
PCI_IRQ_ALL_TYPES, to use in these situations. So add PCI_IRQ_MSI_TYPES,
for this purpose.

Signed-off-by: Piotr Stankiewicz <piotr.stankiewicz@...el.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@...el.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>
---
 Documentation/PCI/msi-howto.rst | 5 +++--
 include/linux/pci.h             | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/Documentation/PCI/msi-howto.rst b/Documentation/PCI/msi-howto.rst
index aa2046af69f7..2800ff5aa395 100644
--- a/Documentation/PCI/msi-howto.rst
+++ b/Documentation/PCI/msi-howto.rst
@@ -105,7 +105,8 @@ if it can't meet the minimum number of vectors.
 The flags argument is used to specify which type of interrupt can be used
 by the device and the driver (PCI_IRQ_LEGACY, PCI_IRQ_MSI, PCI_IRQ_MSIX).
 A convenient short-hand (PCI_IRQ_ALL_TYPES) is also available to ask for
-any possible kind of interrupt.  If the PCI_IRQ_AFFINITY flag is set,
+any possible kind of interrupt, and (PCI_IRQ_MSI_TYPES) to ask for message
+signalled interrupts (MSI or MSI-X).  If the PCI_IRQ_AFFINITY flag is set,
 pci_alloc_irq_vectors() will spread the interrupts around the available CPUs.
 
 To get the Linux IRQ numbers passed to request_irq() and free_irq() and the
@@ -160,7 +161,7 @@ the single MSI mode for a device.  It could be done by passing two 1s as
 Some devices might not support using legacy line interrupts, in which case
 the driver can specify that only MSI or MSI-X is acceptable::
 
-	nvec = pci_alloc_irq_vectors(pdev, 1, nvec, PCI_IRQ_MSI | PCI_IRQ_MSIX);
+	nvec = pci_alloc_irq_vectors(pdev, 1, nvec, PCI_IRQ_MSI_TYPES);
 	if (nvec < 0)
 		goto out_err;
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 83ce1cdf5676..b6c9bf70363e 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1422,8 +1422,8 @@ int pci_set_vga_state(struct pci_dev *pdev, bool decode,
  */
 #define PCI_IRQ_VIRTUAL		(1 << 4)
 
-#define PCI_IRQ_ALL_TYPES \
-	(PCI_IRQ_LEGACY | PCI_IRQ_MSI | PCI_IRQ_MSIX)
+#define PCI_IRQ_MSI_TYPES	(PCI_IRQ_MSI | PCI_IRQ_MSIX)
+#define PCI_IRQ_ALL_TYPES	(PCI_IRQ_LEGACY | PCI_IRQ_MSI_TYPES)
 
 /* kmem_cache style wrapper around pci_alloc_consistent() */
 
-- 
2.17.2