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-rw-r--r--drivers/misc/cxl/api.c15
-rw-r--r--drivers/misc/cxl/base.c17
-rw-r--r--drivers/misc/cxl/context.c1
-rw-r--r--drivers/misc/cxl/cxl.h10
-rw-r--r--drivers/misc/cxl/main.c1
-rw-r--r--include/misc/cxl.h9
6 files changed, 53 insertions, 0 deletions
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index 1e2c0d9f1df7..f02a85974e49 100644
--- 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)
{
diff --git a/drivers/misc/cxl/base.c b/drivers/misc/cxl/base.c
index e1e80cb99ad9..fe90f895bb10 100644
--- a/drivers/misc/cxl/base.c
+++ b/drivers/misc/cxl/base.c
@@ -141,6 +141,23 @@ void cxl_pci_disable_device(struct pci_dev *dev)
}
EXPORT_SYMBOL_GPL(cxl_pci_disable_device);
+int cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq)
+{
+ int ret;
+ struct cxl_calls *calls;
+
+ calls = cxl_calls_get();
+ if (!calls)
+ return -EBUSY;
+
+ ret = calls->cxl_next_msi_hwirq(pdev, ctx, afu_irq);
+
+ cxl_calls_put(calls);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cxl_next_msi_hwirq);
+
static int __init cxl_base_init(void)
{
struct device_node *np;
diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
index edbb99e93114..2616cddbbb33 100644
--- a/drivers/misc/cxl/context.c
+++ b/drivers/misc/cxl/context.c
@@ -68,6 +68,7 @@ int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master,
ctx->pending_afu_err = false;
INIT_LIST_HEAD(&ctx->irq_names);
+ INIT_LIST_HEAD(&ctx->extra_irq_contexts);
/*
* When we have to destroy all contexts in cxl_context_detach_all() we
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index b81f476a2b9f..73b9a55aa35b 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -537,6 +537,14 @@ struct cxl_context {
atomic_t afu_driver_events;
struct rcu_head rcu;
+
+ /*
+ * Only used when more interrupts are allocated via
+ * pci_enable_msix_range than are supported in the default context, to
+ * use additional contexts to overcome the limitation. i.e. Mellanox
+ * CX4 only:
+ */
+ struct list_head extra_irq_contexts;
};
struct cxl_service_layer_ops {
@@ -722,11 +730,13 @@ ssize_t cxl_pci_afu_read_err_buffer(struct cxl_afu *afu, char *buf,
/* Internal functions wrapped in cxl_base to allow PHB to call them */
bool _cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu);
void _cxl_pci_disable_device(struct pci_dev *dev);
+int _cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq);
struct cxl_calls {
void (*cxl_slbia)(struct mm_struct *mm);
bool (*cxl_pci_associate_default_context)(struct pci_dev *dev, struct cxl_afu *afu);
void (*cxl_pci_disable_device)(struct pci_dev *dev);
+ int (*cxl_next_msi_hwirq)(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq);
struct module *owner;
};
diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
index 4e5474b00b28..66fac713e7ad 100644
--- a/drivers/misc/cxl/main.c
+++ b/drivers/misc/cxl/main.c
@@ -112,6 +112,7 @@ static struct cxl_calls cxl_calls = {
.cxl_slbia = cxl_slbia_core,
.cxl_pci_associate_default_context = _cxl_pci_associate_default_context,
.cxl_pci_disable_device = _cxl_pci_disable_device,
+ .cxl_next_msi_hwirq = _cxl_next_msi_hwirq,
.owner = THIS_MODULE,
};
diff --git a/include/misc/cxl.h b/include/misc/cxl.h
index fc07ed47c2d8..6c52cbcdfd79 100644
--- a/include/misc/cxl.h
+++ b/include/misc/cxl.h
@@ -178,6 +178,15 @@ 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
* identical to the cxl file descriptor user API. An example use case:
*

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