1 files changed, 59 insertions, 0 deletions
diff --git a/include/misc/cxl.h b/include/misc/cxl.h
index b6d040f31f76..480d50a0b8ba 100644
--- a/include/misc/cxl.h
+++ b/include/misc/cxl.h
@@ -24,6 +24,46 @@
  * generic PCI API. This API is agnostic to the actual AFU.
  */
 
+#define CXL_SLOT_FLAG_DMA 0x1
+
+/*
+ * Checks if the given card is in a cxl capable slot. Pass CXL_SLOT_FLAG_DMA if
+ * the card requires CAPP DMA mode to also check if the system supports it.
+ * This is intended to be used by bi-modal devices to determine if they can use
+ * cxl mode or if they should continue running in PCI mode.
+ *
+ * Note that this only checks if the slot is cxl capable - it does not
+ * currently check if the CAPP is currently available for chips where it can be
+ * assigned to different PHBs on a first come first serve basis (i.e. P8)
+ */
+bool cxl_slot_is_supported(struct pci_dev *dev, int flags);
+
+
+#define CXL_BIMODE_CXL 1
+#define CXL_BIMODE_PCI 2
+
+/*
+ * Check the mode that the given bi-modal CXL adapter is currently in and
+ * change it if necessary. This does not apply to AFU drivers.
+ *
+ * If the mode matches the requested mode this function will return 0 - if the
+ * driver was expecting the generic CXL driver to have bound to the adapter and
+ * it gets this return value it should fail the probe function to give the CXL
+ * driver a chance to probe it.
+ *
+ * If the mode does not match it will start a background task to unplug the
+ * device from Linux and switch its mode, and will return -EBUSY. At this
+ * point the calling driver should make sure it has released the device and
+ * fail its probe function.
+ *
+ * The offset of the CXL VSEC can be provided to this function. If 0 is passed,
+ * this function will search for a CXL VSEC with ID 0x1280 and return -ENODEV
+ * if it is not found.
+ */
+#ifdef CONFIG_CXL_BIMODAL
+int cxl_check_and_switch_mode(struct pci_dev *dev, int mode, int vsec);
+#endif
+
 /* Get the AFU associated with a pci_dev */
 struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev);
 
@@ -151,6 +191,25 @@ void cxl_psa_unmap(void __iomem *addr);
 /*  Get the process element for this context */
 int cxl_process_element(struct cxl_context *ctx);
 
+/*
+ * Limit the number of interrupts that a single context can allocate via
+ * cxl_start_work. If using the api with a real phb, this may be used to
+ * request that additional default contexts be created when allocating
+ * interrupts via pci_enable_msix_range. These will be set to the same running
+ * state as the default context, and if that is running it will reuse the
+ * parameters previously passed to cxl_start_context for the default context.
+ */
+int cxl_set_max_irqs_per_process(struct pci_dev *dev, int irqs);
+int cxl_get_max_irqs_per_process(struct pci_dev *dev);
+
+/*
+ * Use to simultaneously iterate over hardware interrupt numbers, contexts and
+ * afu interrupt numbers allocated for the device via pci_enable_msix_range and
+ * is a useful convenience function when working with hardware that has
+ * limitations on the number of interrupts per process. *ctx and *afu_irq
+ * should be NULL and 0 to start the iteration.
+ */
+int cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq);
 
 /*
  * These calls allow drivers to create their own file descriptors and make them