[PATCH] powerpc/xive: Fix compile when !CONFIG_PPC_POWERNV.

[Cédric Le Goater]

The automatic "save & restore" of interrupt context is a POWER10/XIVE2
feature exploited by KVM under the PowerNV platform. It is not
available under pSeries and the associated toggle should not be
exposed under the XIVE debugfs directory.

Introduce a platform handler for debugfs initialization and move the
'save-restore' entry under the native (PowerNV) backend to fix compile
when !CONFIG_PPC_POWERNV.

Reported-by: kernel test robot <l...@intel.com>
Fixes: 1e7684dc4fc7 ("powerpc/xive: Add a debugfs toggle for save-restore")
Signed-off-by: Cédric Le Goater <c...@kaod.org>
---
 arch/powerpc/sysdev/xive/xive-internal.h |  1 +
 arch/powerpc/sysdev/xive/common.c        |  4 +++-
 arch/powerpc/sysdev/xive/native.c        | 11 +++++++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/sysdev/xive/xive-internal.h 
b/arch/powerpc/sysdev/xive/xive-internal.h
index e0941bc64430..fe6d95d54af9 100644
--- a/arch/powerpc/sysdev/xive/xive-internal.h
+++ b/arch/powerpc/sysdev/xive/xive-internal.h
@@ -58,6 +58,7 @@ struct xive_ops {
        void    (*put_ipi)(unsigned int cpu, struct xive_cpu *xc);
 #endif
        int     (*debug_show)(struct seq_file *m, void *private);
+       int     (*debug_create)(struct dentry *xive_dir);
        const char *name;
 };
 
diff --git a/arch/powerpc/sysdev/xive/common.c 
b/arch/powerpc/sysdev/xive/common.c
index 43f7f7df6407..1ca5564bda9d 100644
--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c
@@ -1847,7 +1847,9 @@ static void xive_core_debugfs_create(void)
                                    &xive_eq_debug_fops);
        }
        debugfs_create_bool("store-eoi", 0600, xive_dir, &xive_store_eoi);
-       debugfs_create_bool("save-restore", 0600, xive_dir, 
&xive_has_save_restore);
+
+       if (xive_ops->debug_create)
+               xive_ops->debug_create(xive_dir);
 }
 #else
 static inline void xive_core_debugfs_create(void) { }
diff --git a/arch/powerpc/sysdev/xive/native.c 
b/arch/powerpc/sysdev/xive/native.c
index d6a091dc1bce..d4243dab230e 100644
--- a/arch/powerpc/sysdev/xive/native.c
+++ b/arch/powerpc/sysdev/xive/native.c
@@ -461,6 +461,14 @@ void xive_native_sync_queue(u32 hw_irq)
 }
 EXPORT_SYMBOL_GPL(xive_native_sync_queue);
 
+#ifdef CONFIG_DEBUG_FS
+static int xive_native_debug_create(struct dentry *xive_dir)
+{
+       debugfs_create_bool("save-restore", 0600, xive_dir, 
&xive_has_save_restore);
+       return 0;
+}
+#endif
+
 static const struct xive_ops xive_native_ops = {
        .populate_irq_data      = xive_native_populate_irq_data,
        .configure_irq          = xive_native_configure_irq,
@@ -478,6 +486,9 @@ static const struct xive_ops xive_native_ops = {
        .get_ipi                = xive_native_get_ipi,
        .put_ipi                = xive_native_put_ipi,
 #endif /* CONFIG_SMP */
+#ifdef CONFIG_DEBUG_FS
+       .debug_create           = xive_native_debug_create,
+#endif /* CONFIG_DEBUG_FS */
        .name                   = "native",
 };
 
-- 
2.31.1