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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>
This commit is contained in:
Stefano Stabellini 2010-08-20 14:46:52 +01:00
parent 7a043f119c
commit 01557baff6
2 changed files with 32 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/xen/events.c
View File

@ -102,6 +102,7 @@ struct irq_info
static struct irq_info *irq_info; static struct irq_info *irq_info;
static int *pirq_to_irq; static int *pirq_to_irq;
static int nr_pirqs;
static int *evtchn_to_irq; static int *evtchn_to_irq;
struct cpu_evtchn_s { struct cpu_evtchn_s {
@ -378,10 +379,12 @@ static int get_nr_hw_irqs(void)
return ret; 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) static int find_unbound_pirq(void)
{ {
int i; int i;
for (i = 0; i < nr_irqs; i++) { for (i = nr_pirqs-1; i >= 0; i--) {
if (pirq_to_irq[i] < 0) if (pirq_to_irq[i] < 0)
return i; 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); 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); irq = find_irq_by_gsi(gsi);
if (irq != -1) { if (irq != -1) {
printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n", 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) 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), cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s),
GFP_KERNEL); GFP_KERNEL);
irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL); irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL);
pirq_to_irq = kcalloc(nr_irqs, sizeof(*pirq_to_irq), GFP_KERNEL); rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_nr_pirqs, &op_nr_pirqs);
for (i = 0; i < nr_irqs; i++) 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; pirq_to_irq[i] = -1;
evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq), evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),

6
include/xen/interface/physdev.h
View File

@ -121,6 +121,12 @@ struct physdev_op {
} u; } 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. * Notify that some PIRQ-bound event channels have been unmasked.
* ** This command is obsolete since interface version 0x00030202 and is ** * ** This command is obsolete since interface version 0x00030202 and is **