linux-kernel - [PATCH v1 1/9] powerpc/machdep: Define 'compatible' property in ppc

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Date:   Wed, 15 Feb 2023 13:53:30 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 1/9] powerpc/machdep: Define 'compatible' property in ppc_md and use it

Most probe functions do nothing else than checking whether
the machine is compatible to a given string.

Define that string in ppc_md structure and check it directly from
probe_machine() instead of using ppc_md.probe() for that.

Keep checking in ppc_md.probe() only for more complex probing.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
v3: New
---
 arch/powerpc/include/asm/machdep.h |  1 +
 arch/powerpc/kernel/setup-common.c | 13 +++++++------
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 378b8d5836a7..c5dfe5ff923c 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -20,6 +20,7 @@ struct pci_host_bridge;
 
 struct machdep_calls {
 	char		*name;
+	char		*compatible;
 #ifdef CONFIG_PPC64
 #ifdef CONFIG_PM
 	void		(*iommu_restore)(void);
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 9b10e57040c6..d1e205fe72ba 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -626,13 +626,14 @@ static __init void probe_machine(void)
 	for (machine_id = &__machine_desc_start;
 	     machine_id < &__machine_desc_end;
 	     machine_id++) {
-		DBG("  %s ...", machine_id->name);
+		DBG("  %s ...\n", machine_id->name);
+		if (machine_id->compatible && !of_machine_is_compatible(machine_id->compatible))
+			continue;
 		memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
-		if (ppc_md.probe()) {
-			DBG(" match !\n");
-			break;
-		}
-		DBG("\n");
+		if (ppc_md.probe && !ppc_md.probe())
+			continue;
+		DBG("   %s match !\n", machine_id->name);
+		break;
 	}
 	/* What can we do if we didn't find ? */
 	if (machine_id >= &__machine_desc_end) {
-- 
2.39.1