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-rw-r--r--drivers/pci/msi/irqdomain.c188
-rw-r--r--drivers/pci/msi/msi.c16
-rw-r--r--drivers/pci/msi/msi.h2
3 files changed, 201 insertions, 5 deletions
diff --git a/drivers/pci/msi/irqdomain.c b/drivers/pci/msi/irqdomain.c
index f4338fb42c2d..be3d50ffc093 100644
--- a/drivers/pci/msi/irqdomain.c
+++ b/drivers/pci/msi/irqdomain.c
@@ -139,6 +139,170 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
}
EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
+/*
+ * Per device MSI[-X] domain functionality
+ */
+static void pci_device_domain_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
+{
+ arg->desc = desc;
+ arg->hwirq = desc->msi_index;
+}
+
+static void pci_irq_mask_msi(struct irq_data *data)
+{
+ struct msi_desc *desc = irq_data_get_msi_desc(data);
+
+ pci_msi_mask(desc, BIT(data->irq - desc->irq));
+}
+
+static void pci_irq_unmask_msi(struct irq_data *data)
+{
+ struct msi_desc *desc = irq_data_get_msi_desc(data);
+
+ pci_msi_unmask(desc, BIT(data->irq - desc->irq));
+}
+
+#ifdef CONFIG_GENERIC_IRQ_RESERVATION_MODE
+# define MSI_REACTIVATE MSI_FLAG_MUST_REACTIVATE
+#else
+# define MSI_REACTIVATE 0
+#endif
+
+#define MSI_COMMON_FLAGS (MSI_FLAG_FREE_MSI_DESCS | \
+ MSI_FLAG_ACTIVATE_EARLY | \
+ MSI_FLAG_DEV_SYSFS | \
+ MSI_REACTIVATE)
+
+static const struct msi_domain_template pci_msi_template = {
+ .chip = {
+ .name = "PCI-MSI",
+ .irq_mask = pci_irq_mask_msi,
+ .irq_unmask = pci_irq_unmask_msi,
+ .irq_write_msi_msg = pci_msi_domain_write_msg,
+ .flags = IRQCHIP_ONESHOT_SAFE,
+ },
+
+ .ops = {
+ .set_desc = pci_device_domain_set_desc,
+ },
+
+ .info = {
+ .flags = MSI_COMMON_FLAGS | MSI_FLAG_MULTI_PCI_MSI,
+ .bus_token = DOMAIN_BUS_PCI_DEVICE_MSI,
+ },
+};
+
+static void pci_irq_mask_msix(struct irq_data *data)
+{
+ pci_msix_mask(irq_data_get_msi_desc(data));
+}
+
+static void pci_irq_unmask_msix(struct irq_data *data)
+{
+ pci_msix_unmask(irq_data_get_msi_desc(data));
+}
+
+static const struct msi_domain_template pci_msix_template = {
+ .chip = {
+ .name = "PCI-MSIX",
+ .irq_mask = pci_irq_mask_msix,
+ .irq_unmask = pci_irq_unmask_msix,
+ .irq_write_msi_msg = pci_msi_domain_write_msg,
+ .flags = IRQCHIP_ONESHOT_SAFE,
+ },
+
+ .ops = {
+ .set_desc = pci_device_domain_set_desc,
+ },
+
+ .info = {
+ .flags = MSI_COMMON_FLAGS | MSI_FLAG_PCI_MSIX,
+ .bus_token = DOMAIN_BUS_PCI_DEVICE_MSIX,
+ },
+};
+
+static bool pci_match_device_domain(struct pci_dev *pdev, enum irq_domain_bus_token bus_token)
+{
+ return msi_match_device_irq_domain(&pdev->dev, MSI_DEFAULT_DOMAIN, bus_token);
+}
+
+static bool pci_create_device_domain(struct pci_dev *pdev, const struct msi_domain_template *tmpl,
+ unsigned int hwsize)
+{
+ struct irq_domain *domain = dev_get_msi_domain(&pdev->dev);
+
+ if (!domain || !irq_domain_is_msi_parent(domain))
+ return true;
+
+ return msi_create_device_irq_domain(&pdev->dev, MSI_DEFAULT_DOMAIN, tmpl,
+ hwsize, NULL, NULL);
+}
+
+/**
+ * pci_setup_msi_device_domain - Setup a device MSI interrupt domain
+ * @pdev: The PCI device to create the domain on
+ *
+ * Return:
+ * True when:
+ * - The device does not have a MSI parent irq domain associated,
+ * which keeps the legacy architecture specific and the global
+ * PCI/MSI domain models working
+ * - The MSI domain exists already
+ * - The MSI domain was successfully allocated
+ * False when:
+ * - MSI-X is enabled
+ * - The domain creation fails.
+ *
+ * The created MSI domain is preserved until:
+ * - The device is removed
+ * - MSI is disabled and a MSI-X domain is created
+ */
+bool pci_setup_msi_device_domain(struct pci_dev *pdev)
+{
+ if (WARN_ON_ONCE(pdev->msix_enabled))
+ return false;
+
+ if (pci_match_device_domain(pdev, DOMAIN_BUS_PCI_DEVICE_MSI))
+ return true;
+ if (pci_match_device_domain(pdev, DOMAIN_BUS_PCI_DEVICE_MSIX))
+ msi_remove_device_irq_domain(&pdev->dev, MSI_DEFAULT_DOMAIN);
+
+ return pci_create_device_domain(pdev, &pci_msi_template, 1);
+}
+
+/**
+ * pci_setup_msix_device_domain - Setup a device MSI-X interrupt domain
+ * @pdev: The PCI device to create the domain on
+ * @hwsize: The size of the MSI-X vector table
+ *
+ * Return:
+ * True when:
+ * - The device does not have a MSI parent irq domain associated,
+ * which keeps the legacy architecture specific and the global
+ * PCI/MSI domain models working
+ * - The MSI-X domain exists already
+ * - The MSI-X domain was successfully allocated
+ * False when:
+ * - MSI is enabled
+ * - The domain creation fails.
+ *
+ * The created MSI-X domain is preserved until:
+ * - The device is removed
+ * - MSI-X is disabled and a MSI domain is created
+ */
+bool pci_setup_msix_device_domain(struct pci_dev *pdev, unsigned int hwsize)
+{
+ if (WARN_ON_ONCE(pdev->msi_enabled))
+ return false;
+
+ if (pci_match_device_domain(pdev, DOMAIN_BUS_PCI_DEVICE_MSIX))
+ return true;
+ if (pci_match_device_domain(pdev, DOMAIN_BUS_PCI_DEVICE_MSI))
+ msi_remove_device_irq_domain(&pdev->dev, MSI_DEFAULT_DOMAIN);
+
+ return pci_create_device_domain(pdev, &pci_msix_template, hwsize);
+}
+
/**
* pci_msi_domain_supports - Check for support of a particular feature flag
* @pdev: The PCI device to operate on
@@ -152,13 +316,33 @@ bool pci_msi_domain_supports(struct pci_dev *pdev, unsigned int feature_mask,
{
struct msi_domain_info *info;
struct irq_domain *domain;
+ unsigned int supported;
domain = dev_get_msi_domain(&pdev->dev);
if (!domain || !irq_domain_is_hierarchy(domain))
return mode == ALLOW_LEGACY;
- info = domain->host_data;
- return (info->flags & feature_mask) == feature_mask;
+
+ if (!irq_domain_is_msi_parent(domain)) {
+ /*
+ * For "global" PCI/MSI interrupt domains the associated
+ * msi_domain_info::flags is the authoritive source of
+ * information.
+ */
+ info = domain->host_data;
+ supported = info->flags;
+ } else {
+ /*
+ * For MSI parent domains the supported feature set
+ * is avaliable in the parent ops. This makes checks
+ * possible before actually instantiating the
+ * per device domain because the parent is never
+ * expanding the PCI/MSI functionality.
+ */
+ supported = domain->msi_parent_ops->supported_flags;
+ }
+
+ return (supported & feature_mask) == feature_mask;
}
/*
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 76a3d447e947..b8d74df3817e 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -436,6 +436,9 @@ int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
if (rc)
return rc;
+ if (!pci_setup_msi_device_domain(dev))
+ return -ENODEV;
+
for (;;) {
if (affd) {
nvec = irq_calc_affinity_vectors(minvec, nvec, affd);
@@ -787,9 +790,13 @@ int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int
if (!pci_msix_validate_entries(dev, entries, nvec, hwsize))
return -EINVAL;
- /* PCI_IRQ_VIRTUAL is a horrible hack! */
- if (nvec > hwsize && !(flags & PCI_IRQ_VIRTUAL))
- nvec = hwsize;
+ if (hwsize < nvec) {
+ /* Keep the IRQ virtual hackery working */
+ if (flags & PCI_IRQ_VIRTUAL)
+ hwsize = nvec;
+ else
+ nvec = hwsize;
+ }
if (nvec < minvec)
return -ENOSPC;
@@ -798,6 +805,9 @@ int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int
if (rc)
return rc;
+ if (!pci_setup_msix_device_domain(dev, hwsize))
+ return -ENODEV;
+
for (;;) {
if (affd) {
nvec = irq_calc_affinity_vectors(minvec, nvec, affd);
diff --git a/drivers/pci/msi/msi.h b/drivers/pci/msi/msi.h
index 9d75b6fb3e0c..74408cc689c6 100644
--- a/drivers/pci/msi/msi.h
+++ b/drivers/pci/msi/msi.h
@@ -105,6 +105,8 @@ enum support_mode {
};
bool pci_msi_domain_supports(struct pci_dev *dev, unsigned int feature_mask, enum support_mode mode);
+bool pci_setup_msi_device_domain(struct pci_dev *pdev);
+bool pci_setup_msix_device_domain(struct pci_dev *pdev, unsigned int hwsize);
/* Legacy (!IRQDOMAIN) fallbacks */