diff options
| author |   Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2010-08-20 14:46:52 +0100 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2010-10-22 21:25:40 +0100 |
| commit | 01557baff6e9c371d4c96e01089dca32cf347500 (patch) | |
| tree | e7c39a32d6ba1f0db53f8c6e512693f3a6f75c3f | |
| parent | xen: support pirq != irq (diff) | |
| download | linux-dev-01557baff6e9c371d4c96e01089dca32cf347500.tar.xz linux-dev-01557baff6e9c371d4c96e01089dca32cf347500.zip | |
xen: get the maximum number of pirqs from xen
Use PHYSDEVOP_get_nr_pirqs to get the maximum number of pirqs from xen.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
| -rw-r--r-- | drivers/xen/events.c | 30 | ||||
| -rw-r--r-- | include/xen/interface/physdev.h | 6 |
2 files changed, 32 insertions, 4 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 018a96275ee4..07e56e5a5d2d 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -102,6 +102,7 @@ struct irq_info static struct irq_info *irq_info; static int *pirq_to_irq; +static int nr_pirqs; static int *evtchn_to_irq; struct cpu_evtchn_s { @@ -378,10 +379,12 @@ static int get_nr_hw_irqs(void) return ret; } +/* callers of this function should make sure that PHYSDEVOP_get_nr_pirqs + * succeeded otherwise nr_pirqs won't hold the right value */ static int find_unbound_pirq(void) { int i; - for (i = 0; i < nr_irqs; i++) { + for (i = nr_pirqs-1; i >= 0; i--) { if (pirq_to_irq[i] < 0) return i; } @@ -602,6 +605,13 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name) spin_lock(&irq_mapping_update_lock); + if ((pirq > nr_pirqs) || (gsi > nr_irqs)) { + printk(KERN_WARNING "xen_map_pirq_gsi: %s %s is incorrect!\n", + pirq > nr_pirqs ? "nr_pirqs" :"", + gsi > nr_irqs ? "nr_irqs" : ""); + goto out; + } + irq = find_irq_by_gsi(gsi); if (irq != -1) { printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n", @@ -1349,14 +1359,26 @@ void xen_callback_vector(void) {} void __init xen_init_IRQ(void) { - int i; + int i, rc; + struct physdev_nr_pirqs op_nr_pirqs; cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s), GFP_KERNEL); irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL); - pirq_to_irq = kcalloc(nr_irqs, sizeof(*pirq_to_irq), GFP_KERNEL); - for (i = 0; i < nr_irqs; i++) + rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_nr_pirqs, &op_nr_pirqs); + if (rc < 0) { + nr_pirqs = nr_irqs; + if (rc != -ENOSYS) + printk(KERN_WARNING "PHYSDEVOP_get_nr_pirqs returned rc=%d\n", rc); + } else { + if (xen_pv_domain() && !xen_initial_domain()) + nr_pirqs = max((int)op_nr_pirqs.nr_pirqs, nr_irqs); + else + nr_pirqs = op_nr_pirqs.nr_pirqs; + } + pirq_to_irq = kcalloc(nr_pirqs, sizeof(*pirq_to_irq), GFP_KERNEL); + for (i = 0; i < nr_pirqs; i++) pirq_to_irq[i] = -1; evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq), diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h index cd6939147cb6..fbb58833f13e 100644 --- a/include/xen/interface/physdev.h +++ b/include/xen/interface/physdev.h @@ -121,6 +121,12 @@ struct physdev_op { } u; }; +#define PHYSDEVOP_get_nr_pirqs 22 +struct physdev_nr_pirqs { + /* OUT */ + uint32_t nr_pirqs; +}; + /* * Notify that some PIRQ-bound event channels have been unmasked. * ** This command is obsolete since interface version 0x00030202 and is ** |