powerpc/fsl_msi: show more meaningful names in /proc/interrupts

Rename the irq controller associated with a MSI interrupt to fsl-msi-<V>, where <V> is the virq of the cascade irq backing up this MSI interrupt. This way, one can set the affinity of a MSI through the cascade irq associated with said MSI interrupt.
Given this example /proc/interrupts snippet:

CPU0 CPU1 CPU2 CPU3

 16:          0          0          0          0   OpenPIC    16 Edge      mpic-error-int
 17:          0          4          0          0  fsl-msi-224   0 Edge      eth0-rx-0
 18:          0          5          0          0  fsl-msi-225   1 Edge      eth0-tx-0
 19:          0          2          0          0  fsl-msi-226   2 Edge      eth0
 [...]
224:          0         11          0          0   OpenPIC   224 Edge      fsl-msi-cascade
225:          0          0          0          0   OpenPIC   225 Edge      fsl-msi-cascade
226:          0          0          0          0   OpenPIC   226 Edge      fsl-msi-cascade

[...]

To change the affinity of MSI interrupt 17 (having the irq controller named "fsl-msi-224") instead of writing /proc/irq/17/smp_affinity, use the associated MSI cascade irq, in this case, interrupt 224, e.g.:

echo 6 > /proc/irq/224/smp_affinity

Note that a MSI cascade irq covers several MSI interrupts, so changing the affinity on the cascade will impact all of the associated MSI interrupts.

---
 arch/powerpc/sysdev/fsl_msi.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

index 0cfc32a..e2ee226 100644
@@ -19,6 +19,7 @@
 #include <linux/slab.h>
 #include <linux/of_platform.h>
 #include <linux/interrupt.h>
+#include <linux/seq_file.h>
 #include <sysdev/fsl_soc.h>
 #include <asm/prom.h>
 #include <asm/hw_irq.h>

@@ -67,11 +68,24 @@ static void fsl_msi_end_irq(struct irq_data *d)
 {
 }
 
+static void fsl_msi_print_chip(struct irq_data *irqd, struct seq_file *p)
+{
+	struct fsl_msi *msi_data = irqd->domain->host_data;
+	irq_hw_number_t hwirq = irqd_to_hwirq(irqd);
+	int cascade_virq, srs;
+
+	srs = (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK;
+	cascade_virq = msi_data->cascade_array[srs]->virq;
+
+	seq_printf(p, " fsl-msi-%d", cascade_virq);
+}
+
+
 static struct irq_chip fsl_msi_chip = {
 	.irq_mask	= mask_msi_irq,
 	.irq_unmask	= unmask_msi_irq,
 	.irq_ack	= fsl_msi_end_irq,
-	.name		= "FSL-MSI",
+	.irq_print_chip = fsl_msi_print_chip,
 };
 
 static int fsl_msi_host_map(struct irq_domain *h, unsigned int virq,

1.9.2