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| author | Tudor Laurentiu <b10716@freescale.com> | 2014-08-19 15:25:05 +0400 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-09-05 03:51:43 +0400 |
| commit | de99f53d3af0e1bb9bc6c9e3107d72f3af6e05e9 (patch) | |
| tree | 3469daf7f91ea35b275ef1f69c6c8852111d62b8 /arch/powerpc/sysdev/fsl_msi.c | |
| parent | 543c043cbae79164aa087f96294cb37fc4a19a59 (diff) | |
| download | linux-de99f53d3af0e1bb9bc6c9e3107d72f3af6e05e9.tar.xz | |
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.
Signed-off-by: Laurentiu Tudor <Laurentiu.Tudor@freescale.com>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/sysdev/fsl_msi.c')
| -rw-r--r-- | arch/powerpc/sysdev/fsl_msi.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/powerpc/sysdev/fsl_msi.c b/arch/powerpc/sysdev/fsl_msi.c index 0cfc32a63039..e2ee226464f8 100644 --- a/arch/powerpc/sysdev/fsl_msi.c +++ b/arch/powerpc/sysdev/fsl_msi.c @@ -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, |