linux-kernel - [PATCH v3 02/15] PCI: Add macro for message signalled interrupt types

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Message-Id: <20200609162243.9102-1-piotr.stankiewicz@intel.com>
Date:   Tue,  9 Jun 2020 18:22:40 +0200
From:   Piotr Stankiewicz <piotr.stankiewicz@...el.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Cc:     Piotr Stankiewicz <piotr.stankiewicz@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Logan Gunthorpe <logang@...tatee.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Kelsey Skunberg <skunberg.kelsey@...il.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Krzysztof Wilczynski <kw@...ux.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Denis Efremov <efremov@...ux.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 02/15] PCI: Add macro 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 macro which defines all types
of message signalled interrupts, to use in such situations. 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>
Reviewed-by: Logan Gunthorpe <logang@...tatee.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 c79d83304e52..a99094f17b21 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1431,8 +1431,8 @@ 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