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Subject[tip: irq/core] PCI/MSI: Move pci_enable_msix_range() to api.c
The following commit has been merged into the irq/core branch of tip:

Commit-ID: be7496c1ef47e1ba8c4b389ee23178fcf066cc4e
Gitweb: https://git.kernel.org/tip/be7496c1ef47e1ba8c4b389ee23178fcf066cc4e
Author: Ahmed S. Darwish <darwi@linutronix.de>
AuthorDate: Fri, 11 Nov 2022 14:54:48 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 17 Nov 2022 15:15:20 +01:00

PCI/MSI: Move pci_enable_msix_range() to api.c

To disentangle the maze in msi.c, all exported device-driver MSI APIs are
now to be grouped in one file, api.c.

Move pci_enable_msix_range() and make its kernel-doc comprehensive.

Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20221111122014.813792885@linutronix.de


---
drivers/pci/msi/api.c | 32 ++++++++++++++++++++++++++++++++
drivers/pci/msi/msi.c | 30 ++++--------------------------
drivers/pci/msi/msi.h | 3 +++
3 files changed, 39 insertions(+), 26 deletions(-)

diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
index 63d7f8f..d480505 100644
--- a/drivers/pci/msi/api.c
+++ b/drivers/pci/msi/api.c
@@ -58,3 +58,35 @@ void pci_disable_msi(struct pci_dev *dev)
msi_unlock_descs(&dev->dev);
}
EXPORT_SYMBOL(pci_disable_msi);
+
+/**
+ * pci_enable_msix_range() - Enable MSI-X interrupt mode on device
+ * @dev: the PCI device to operate on
+ * @entries: input/output parameter, array of MSI-X configuration entries
+ * @minvec: minimum required number of MSI-X vectors
+ * @maxvec: maximum desired number of MSI-X vectors
+ *
+ * Legacy device driver API to enable MSI-X interrupt mode on device and
+ * configure its MSI-X capability structure as appropriate. The passed
+ * @entries array must have each of its members "entry" field set to a
+ * desired (valid) MSI-X vector number, where the range of valid MSI-X
+ * vector numbers can be queried through pci_msix_vec_count(). If
+ * successful, the driver must invoke pci_disable_msix() on cleanup.
+ *
+ * NOTE: The newer pci_alloc_irq_vectors() / pci_free_irq_vectors() API
+ * pair should, in general, be used instead.
+ *
+ * Return: number of MSI-X vectors allocated (which might be smaller
+ * than @maxvecs), where Linux IRQ numbers for such allocated vectors
+ * are saved back in the @entries array elements' "vector" field. Return
+ * -ENOSPC if less than @minvecs interrupt vectors are available.
+ * Return -EINVAL if one of the passed @entries members "entry" field
+ * was invalid or a duplicate, or if plain MSI interrupts mode was
+ * earlier enabled on device. Return other errnos otherwise.
+ */
+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, NULL, 0);
+}
+EXPORT_SYMBOL(pci_enable_msix_range);
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 98f07ad..6700ef1 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -844,10 +844,10 @@ int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
}
}

-static int __pci_enable_msix_range(struct pci_dev *dev,
- struct msix_entry *entries, int minvec,
- int maxvec, struct irq_affinity *affd,
- int flags)
+int __pci_enable_msix_range(struct pci_dev *dev,
+ struct msix_entry *entries, int minvec,
+ int maxvec, struct irq_affinity *affd,
+ int flags)
{
int rc, nvec = maxvec;

@@ -887,28 +887,6 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
}

/**
- * pci_enable_msix_range - 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
- * @minvec: minimum number of MSI-X IRQs requested
- * @maxvec: maximum number of MSI-X IRQs requested
- *
- * Setup the MSI-X capability structure of device function with a maximum
- * possible number of interrupts in the range between @minvec and @maxvec
- * upon its software driver call to request for MSI-X mode enabled on its
- * hardware device function. It returns a negative errno if an error occurs.
- * If it succeeds, it returns the actual number of interrupts allocated and
- * indicates the successful configuration of MSI-X capability structure
- * with new allocated MSI-X interrupts.
- **/
-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, NULL, 0);
-}
-EXPORT_SYMBOL(pci_enable_msix_range);
-
-/**
* pci_alloc_irq_vectors_affinity - allocate multiple IRQs for a device
* @dev: PCI device to operate on
* @min_vecs: minimum number of vectors required (must be >= 1)
diff --git a/drivers/pci/msi/msi.h b/drivers/pci/msi/msi.h
index 00bb98d..8c4a528 100644
--- a/drivers/pci/msi/msi.h
+++ b/drivers/pci/msi/msi.h
@@ -88,8 +88,11 @@ static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
void pci_msi_shutdown(struct pci_dev *dev);
void pci_free_msi_irqs(struct pci_dev *dev);
int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, struct irq_affinity *affd);
+int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int minvec,
+ int maxvec, struct irq_affinity *affd, int flags);

/* Legacy (!IRQDOMAIN) fallbacks */
+
#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev);
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