[xen staging] ppc/shutdown: Implement machine_{halt,restart}()

[patchbot@xxxxxxx]

commit e44f33ccddc20079d9a22e1f0659c88fde0f4eb2
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Jul 5 18:56:48 2024 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Jul 22 10:50:03 2024 +0100

    ppc/shutdown: Implement machine_{halt,restart}()
    
    OPAL has easy APIs for shutdown/reboot, so wire them up.
    
    Then, use machine_halt() rather than an infinite loop at the end of
    start_xen().  This avoids the Qemu smoke test needing to wait for the full
    timeout in order to succeed.
    
      (XEN) 8e011600000000c0 is the result of PTE map
      Enabled radix in LPCR
      Flushed TLB
      Hello, ppc64le!
      [    6.341897656,5] OPAL: Shutdown request type 0x0...
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
---
 xen/arch/ppc/Makefile           |  1 +
 xen/arch/ppc/ppc64/opal-calls.S |  4 ++++
 xen/arch/ppc/setup.c            |  8 +++----
 xen/arch/ppc/shutdown.c         | 48 +++++++++++++++++++++++++++++++++++++++++
 xen/arch/ppc/stubs.c            | 12 -----------
 5 files changed, 56 insertions(+), 17 deletions(-)

diff --git a/xen/arch/ppc/Makefile b/xen/arch/ppc/Makefile
index 71feb5e2c4..655d212f66 100644
--- a/xen/arch/ppc/Makefile
+++ b/xen/arch/ppc/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_EARLY_PRINTK) += early_printk.init.o
 obj-y += mm-radix.o
 obj-y += opal.o
 obj-y += setup.o
+obj-y += shutdown.o
 obj-y += stubs.o
 obj-y += tlb-radix.o
 
diff --git a/xen/arch/ppc/ppc64/opal-calls.S b/xen/arch/ppc/ppc64/opal-calls.S
index cc5de75c8a..69d07909d1 100644
--- a/xen/arch/ppc/ppc64/opal-calls.S
+++ b/xen/arch/ppc/ppc64/opal-calls.S
@@ -79,3 +79,7 @@ opal_return_mmu:
 OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE)
 OPAL_CALL(opal_console_flush, OPAL_CONSOLE_FLUSH)
 OPAL_CALL(opal_reinit_cpus, OPAL_REINIT_CPUS)
+
+OPAL_CALL(opal_cec_power_down, OPAL_CEC_POWER_DOWN)
+OPAL_CALL(opal_cec_reboot, OPAL_CEC_REBOOT)
+OPAL_CALL(opal_poll_events, OPAL_POLL_EVENTS)
diff --git a/xen/arch/ppc/setup.c b/xen/arch/ppc/setup.c
index 7fe06aa4bf..5fb5ab64e3 100644
--- a/xen/arch/ppc/setup.c
+++ b/xen/arch/ppc/setup.c
@@ -2,6 +2,8 @@
 #include <xen/init.h>
 #include <xen/lib.h>
 #include <xen/mm.h>
+#include <xen/shutdown.h>
+
 #include <public/version.h>
 #include <asm/boot.h>
 #include <asm/early_printk.h>
@@ -43,11 +45,7 @@ void __init noreturn start_xen(unsigned long r3, unsigned 
long r4,
 
     early_printk("Hello, ppc64le!\n");
 
-    for ( ; ; )
-        /* Set current hardware thread to very low priority */
-        HMT_very_low();
-
-    unreachable();
+    machine_halt();
 }
 
 void arch_get_xen_caps(xen_capabilities_info_t *info)
diff --git a/xen/arch/ppc/shutdown.c b/xen/arch/ppc/shutdown.c
new file mode 100644
index 0000000000..6e49a095d8
--- /dev/null
+++ b/xen/arch/ppc/shutdown.c
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#include <xen/shutdown.h>
+
+#include <asm/opal-api.h>
+
+int64_t opal_cec_power_down(uint64_t request);
+int64_t opal_cec_reboot(void);
+int64_t opal_poll_events(uint64_t *outstanding_event_mask);
+
+void machine_halt(void)
+{
+    int rc;
+
+    /* TODO: mask any OPAL IRQs before shutting down */
+
+    do {
+        rc = opal_cec_power_down(0);
+
+        if ( rc == OPAL_BUSY_EVENT )
+            opal_poll_events(NULL);
+
+    } while ( rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT );
+
+    for ( ;; )
+        opal_poll_events(NULL);
+}
+
+void machine_restart(unsigned int delay_millisecs)
+{
+    int rc;
+
+    /*
+     * TODO: mask any OPAL IRQs before shutting down
+     * TODO: mdelay(delay_millisecs);
+     */
+
+    do {
+        rc = opal_cec_reboot();
+
+        if ( rc == OPAL_BUSY_EVENT )
+            opal_poll_events(NULL);
+
+    } while ( rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT );
+
+    for ( ;; )
+        opal_poll_events(NULL);
+}
+
diff --git a/xen/arch/ppc/stubs.c b/xen/arch/ppc/stubs.c
index e743a86710..50e54d61c0 100644
--- a/xen/arch/ppc/stubs.c
+++ b/xen/arch/ppc/stubs.c
@@ -60,18 +60,6 @@ void vcpu_show_execution_state(struct vcpu *v)
     BUG_ON("unimplemented");
 }
 
-/* shutdown.c */
-
-void machine_restart(unsigned int delay_millisecs)
-{
-    BUG_ON("unimplemented");
-}
-
-void machine_halt(void)
-{
-    BUG_ON("unimplemented");
-}
-
 /* vm_event.c */
 
 void vm_event_fill_regs(vm_event_request_t *req)
--
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