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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-10 16:59:18 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-10 16:59:18 +1000
commit73ed148aea9dc0508be7e30e7a447f55c1b2f378 (patch)
tree2571b5d1851a9f2bef62e92def3608f738748251 /arch/powerpc/platforms/powernv/setup.c
parent1de1455f33709a8afd8d41d26d09739a1148105b (diff)
downloadvexpress-lsk-73ed148aea9dc0508be7e30e7a447f55c1b2f378.tar.gz
powerpc/powernv: Improve kexec reliability
We add a machine_shutdown hook that frees the OPAL interrupts (so they get masked at the source and don't fire while kexec'ing) and which triggers an IODA reset on all the PCIe host bridges which will have the effect of blocking all DMAs and subsequent PCIs interrupts. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/powernv/setup.c')
-rw-r--r--arch/powerpc/platforms/powernv/setup.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index db1ad1c8f68..c20381caaa3 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -126,6 +126,17 @@ static void pnv_progress(char *s, unsigned short hex)
{
}
+static void pnv_shutdown(void)
+{
+ /* Let the PCI code clear up IODA tables */
+ pnv_pci_shutdown();
+
+ /* And unregister all OPAL interrupts so they don't fire
+ * up while we kexec
+ */
+ opal_shutdown();
+}
+
#ifdef CONFIG_KEXEC
static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
{
@@ -187,6 +198,7 @@ define_machine(powernv) {
.init_IRQ = pnv_init_IRQ,
.show_cpuinfo = pnv_show_cpuinfo,
.progress = pnv_progress,
+ .machine_shutdown = pnv_shutdown,
.power_save = power7_idle,
.calibrate_decr = generic_calibrate_decr,
#ifdef CONFIG_KEXEC