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authorLinus Torvalds <torvalds@linux-foundation.org>2010-12-03 11:30:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-12-03 11:30:57 -0800
commit11e8896474495dec7ce19a542f67def847ec208f (patch)
tree3eeb941629110b2ad9f5a3fe08fa23c846f6a44e /drivers
parent8338fded137681bc3c1e99a69ac937a4fb016fe4 (diff)
parent512b109ec9620d037d6d2f6bd1bae9ce34dd6779 (diff)
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Merge branch '2.6.37-rc4-pvhvm-fixes' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm
* '2.6.37-rc4-pvhvm-fixes' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm: xen: unplug the emulated devices at resume time xen: fix save/restore for PV on HVM guests with pirq remapping xen: resume the pv console for hvm guests too xen: fix MSI setup and teardown for PV on HVM guests xen: use PHYSDEVOP_get_free_pirq to implement find_unbound_pirq
Diffstat (limited to 'drivers')
-rw-r--r--drivers/xen/events.c105
-rw-r--r--drivers/xen/manage.c1
2 files changed, 75 insertions, 31 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 0009e489272..31af0ac31a9 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -105,7 +105,6 @@ 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 {
@@ -385,12 +384,17 @@ 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)
+static int find_unbound_pirq(int type)
{
- int i;
- for (i = nr_pirqs-1; i >= 0; i--) {
+ int rc, i;
+ struct physdev_get_free_pirq op_get_free_pirq;
+ op_get_free_pirq.type = type;
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
+ if (!rc)
+ return op_get_free_pirq.pirq;
+
+ for (i = 0; i < nr_irqs; i++) {
if (pirq_to_irq[i] < 0)
return i;
}
@@ -611,10 +615,10 @@ 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)) {
+ if ((pirq > nr_irqs) || (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" : "");
+ pirq > nr_irqs ? "pirq" :"",
+ gsi > nr_irqs ? "gsi" : "");
goto out;
}
@@ -664,17 +668,21 @@ out:
#include <linux/msi.h>
#include "../pci/msi.h"
-void xen_allocate_pirq_msi(char *name, int *irq, int *pirq)
+void xen_allocate_pirq_msi(char *name, int *irq, int *pirq, int alloc)
{
spin_lock(&irq_mapping_update_lock);
- *irq = find_unbound_irq();
- if (*irq == -1)
- goto out;
+ if (alloc & XEN_ALLOC_IRQ) {
+ *irq = find_unbound_irq();
+ if (*irq == -1)
+ goto out;
+ }
- *pirq = find_unbound_pirq();
- if (*pirq == -1)
- goto out;
+ if (alloc & XEN_ALLOC_PIRQ) {
+ *pirq = find_unbound_pirq(MAP_PIRQ_TYPE_MSI);
+ if (*pirq == -1)
+ goto out;
+ }
set_irq_chip_and_handler_name(*irq, &xen_pirq_chip,
handle_level_irq, name);
@@ -762,6 +770,7 @@ int xen_destroy_irq(int irq)
printk(KERN_WARNING "unmap irq failed %d\n", rc);
goto out;
}
+ pirq_to_irq[info->u.pirq.pirq] = -1;
}
irq_info[irq] = mk_unbound_info();
@@ -782,6 +791,11 @@ int xen_gsi_from_irq(unsigned irq)
return gsi_from_irq(irq);
}
+int xen_irq_from_pirq(unsigned pirq)
+{
+ return pirq_to_irq[pirq];
+}
+
int bind_evtchn_to_irq(unsigned int evtchn)
{
int irq;
@@ -1279,6 +1293,42 @@ static int retrigger_dynirq(unsigned int irq)
return ret;
}
+static void restore_cpu_pirqs(void)
+{
+ int pirq, rc, irq, gsi;
+ struct physdev_map_pirq map_irq;
+
+ for (pirq = 0; pirq < nr_irqs; pirq++) {
+ irq = pirq_to_irq[pirq];
+ if (irq == -1)
+ continue;
+
+ /* save/restore of PT devices doesn't work, so at this point the
+ * only devices present are GSI based emulated devices */
+ gsi = gsi_from_irq(irq);
+ if (!gsi)
+ continue;
+
+ map_irq.domid = DOMID_SELF;
+ map_irq.type = MAP_PIRQ_TYPE_GSI;
+ map_irq.index = gsi;
+ map_irq.pirq = pirq;
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
+ if (rc) {
+ printk(KERN_WARNING "xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
+ gsi, irq, pirq, rc);
+ irq_info[irq] = mk_unbound_info();
+ pirq_to_irq[pirq] = -1;
+ continue;
+ }
+
+ printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
+
+ startup_pirq(irq);
+ }
+}
+
static void restore_cpu_virqs(unsigned int cpu)
{
struct evtchn_bind_virq bind_virq;
@@ -1422,6 +1472,8 @@ void xen_irq_resume(void)
unmask_evtchn(evtchn);
}
+
+ restore_cpu_pirqs();
}
static struct irq_chip xen_dynamic_chip __read_mostly = {
@@ -1506,26 +1558,17 @@ void xen_callback_vector(void) {}
void __init xen_init_IRQ(void)
{
- int i, rc;
- struct physdev_nr_pirqs op_nr_pirqs;
+ int i;
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);
- 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++)
+ /* We are using nr_irqs as the maximum number of pirq available but
+ * that number is actually chosen by Xen and we don't know exactly
+ * what it is. Be careful choosing high pirq numbers. */
+ pirq_to_irq = kcalloc(nr_irqs, sizeof(*pirq_to_irq), GFP_KERNEL);
+ for (i = 0; i < nr_irqs; i++)
pirq_to_irq[i] = -1;
evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index ef9c7db5207..db8c4c4ac88 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -49,6 +49,7 @@ static int xen_hvm_suspend(void *data)
if (!*cancelled) {
xen_irq_resume();
+ xen_console_resume();
xen_timer_resume();
}