cxl: Add preliminary workaround for CX4 interrupt limitation

[mirror_ubuntu-hirsute-kernel.git] / drivers / misc / cxl / api.c

diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index 1e2c0d9f1df7f4dc335397b25f3808e42c39ef97..f02a85974e49c10c24c696001f95b93d68bc90e6 100644 (file)
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -97,6 +97,21 @@ static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
        return 0;
 }
 
+int _cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq)
+{
+       if (*ctx == NULL || *afu_irq == 0) {
+               *afu_irq = 1;
+               *ctx = cxl_get_context(pdev);
+       } else {
+               (*afu_irq)++;
+               if (*afu_irq > cxl_get_max_irqs_per_process(pdev)) {
+                       *ctx = list_next_entry(*ctx, extra_irq_contexts);
+                       *afu_irq = 1;
+               }
+       }
+       return cxl_find_afu_irq(*ctx, *afu_irq);
+}
+/* Exported via cxl_base */
 
 int cxl_set_priv(struct cxl_context *ctx, void *priv)
 {