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x86, ioapic: Use ioapic_saved_data while enabling intr-remapping

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Code flow for enabling interrupt-remapping was
allocating/freeing buffers for saving/restoring io-apic RTE's.
ioapic suspend/resume code uses boot time allocated
ioapic_saved_data that is a perfect match for reuse here.

This will remove the unnecessary allocation/free of the
temporary buffers during suspend/resume of interrupt-remapping
enabled platforms aswell as paving the way for further code
consolidation.

Tested-by: Daniel J Blueman <daniel.blueman@gmail.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/20110518233157.574469296@sbsiddha-MOBL3.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Suresh Siddha
2011-05-18 16:31:33 -07:00
committed by Ingo Molnar
parent 4c79185cdb
commit 31dce14a32
3 changed files with 37 additions and 111 deletions
Download Patch File Download Diff File Expand all files Collapse all files

80
arch/x86/kernel/apic/io_apic.c
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@@ -101,7 +101,7 @@ int mp_irq_entries;
static int nr_irqs_gsi = NR_IRQS_LEGACY;
/*
* Saved I/O APIC state during suspend/resume.
* Saved I/O APIC state during suspend/resume, or while enabling intr-remap.
*/
static struct IO_APIC_route_entry *ioapic_saved_data[MAX_IO_APICS];
@@ -628,74 +628,43 @@ static int __init ioapic_pirq_setup(char *str)
__setup("pirq=", ioapic_pirq_setup);
#endif /* CONFIG_X86_32 */
struct IO_APIC_route_entry **alloc_ioapic_entries(void)
{
int apic;
struct IO_APIC_route_entry **ioapic_entries;
ioapic_entries = kzalloc(sizeof(*ioapic_entries) * nr_ioapics,
GFP_ATOMIC);
if (!ioapic_entries)
return 0;
for (apic = 0; apic < nr_ioapics; apic++) {
ioapic_entries[apic] =
kzalloc(sizeof(struct IO_APIC_route_entry) *
nr_ioapic_registers[apic], GFP_ATOMIC);
if (!ioapic_entries[apic])
goto nomem;
}
return ioapic_entries;
nomem:
while (--apic >= 0)
kfree(ioapic_entries[apic]);
kfree(ioapic_entries);
return 0;
}
/*
* Saves all the IO-APIC RTE's
*/
int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
int save_ioapic_entries(void)
{
int apic, pin;
if (!ioapic_entries)
return -ENOMEM;
int err = 0;
for (apic = 0; apic < nr_ioapics; apic++) {
if (!ioapic_entries[apic])
return -ENOMEM;
if (!ioapic_saved_data[apic]) {
err = -ENOMEM;
continue;
}
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
ioapic_entries[apic][pin] =
ioapic_saved_data[apic][pin] =
ioapic_read_entry(apic, pin);
}
return 0;
return err;
}
/*
* Mask all IO APIC entries.
*/
void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
void mask_ioapic_entries(void)
{
int apic, pin;
if (!ioapic_entries)
return;
for (apic = 0; apic < nr_ioapics; apic++) {
if (!ioapic_entries[apic])
break;
if (!ioapic_saved_data[apic])
continue;
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
struct IO_APIC_route_entry entry;
entry = ioapic_entries[apic][pin];
entry = ioapic_saved_data[apic][pin];
if (!entry.mask) {
entry.mask = 1;
ioapic_write_entry(apic, pin, entry);
@@ -705,36 +674,23 @@ void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
}
/*
* Restore IO APIC entries which was saved in ioapic_entries.
* Restore IO APIC entries which was saved in ioapic_saved_data
*/
int restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
int restore_ioapic_entries(void)
{
int apic, pin;
if (!ioapic_entries)
return -ENOMEM;
for (apic = 0; apic < nr_ioapics; apic++) {
if (!ioapic_entries[apic])
return -ENOMEM;
if (!ioapic_saved_data[apic])
continue;
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
ioapic_write_entry(apic, pin,
ioapic_entries[apic][pin]);
ioapic_saved_data[apic][pin]);
}
return 0;
}
void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries)
{
int apic;
for (apic = 0; apic < nr_ioapics; apic++)
kfree(ioapic_entries[apic]);
kfree(ioapic_entries);
}
/*
* Find the IRQ entry number of a certain pin.
*/