powerpc/powernv: Call OPAL sync before kexec'ing

Its possible that OPAL may be writing to host memory during
kexec (like dump retrieve scenario). In this situation we might
end up corrupting host memory.

This patch makes OPAL sync call to make sure OPAL stops
writing to host memory before kexec'ing.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

4 files changed, 23 insertions, 2 deletions

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 9a87b4401a41..40157e2ca691 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -156,6 +156,7 @@ extern int opal_enter_rtas(struct rtas_args *args,
 #define OPAL_FLASH_UPDATE                       78
 #define OPAL_GET_MSG                            85
 #define OPAL_CHECK_ASYNC_COMPLETION             86
+#define OPAL_SYNC_HOST_REBOOT                   87
 
 #ifndef __ASSEMBLY__
 
@@ -828,6 +829,7 @@ int64_t opal_update_flash(uint64_t blk_list);
 
 int64_t opal_get_msg(uint64_t buffer, size_t size);
 int64_t opal_check_completion(uint64_t buffer, size_t size, uint64_t token);
+int64_t opal_sync_host_reboot(void);
 
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname, int depth, void *data);
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index 719aa5c325c6..3e8829c40fbb 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -128,3 +128,4 @@ OPAL_CALL(opal_manage_flash,			OPAL_FLASH_MANAGE);
 OPAL_CALL(opal_update_flash,                    OPAL_FLASH_UPDATE);
 OPAL_CALL(opal_get_msg,                         OPAL_GET_MSG);
 OPAL_CALL(opal_check_completion,                OPAL_CHECK_ASYNC_COMPLETION);
+OPAL_CALL(opal_sync_host_reboot,                OPAL_SYNC_HOST_REBOOT);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 7a184a0ff183..65499adaecff 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -20,6 +20,7 @@
 #include <linux/slab.h>
 #include <linux/sched.h>
 #include <linux/kobject.h>
+#include <linux/delay.h>
 #include <asm/opal.h>
 #include <asm/firmware.h>
 #include <asm/mce.h>
@@ -482,10 +483,25 @@ subsys_initcall(opal_init);
 void opal_shutdown(void)
 {
         unsigned int i;
+        long rc = OPAL_BUSY;
 
+        /* First free interrupts, which will also mask them */
         for (i = 0; i < opal_irq_count; i++) {
                 if (opal_irqs[i])
                         free_irq(opal_irqs[i], NULL);
                 opal_irqs[i] = 0;
         }
+
+        /*
+         * Then sync with OPAL which ensure anything that can
+         * potentially write to our memory has completed such
+         * as an ongoing dump retrieval
+         */
+        while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
+                rc = opal_sync_host_reboot();
+                if (rc == OPAL_BUSY)
+                        opal_poll_events(NULL);
+                else
+                        mdelay(10);
+        }
 }
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 19884b2a51b4..a932feb2901c 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -145,8 +145,10 @@ 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
+        /*
+         * Stop OPAL activity: Unregister all OPAL interrupts so they
+         * don't fire up while we kexec and make sure all potentially
+         * DMA'ing ops are complete (such as dump retrieval).
          */
         opal_shutdown();
 }