powerpc: Make set_dabr() a ppc_md function

Move pSeries specific code in set_dabr() into a ppc_md function, this will
allow us to keep plpar_wrappers.h private to platforms/pseries.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>

arch/powerpc/kernel/process.c

@@ -48,8 +48,8 @@
 #include <asm/prom.h>
 #ifdef CONFIG_PPC64
 #include <asm/firmware.h>
-#include <asm/plpar_wrappers.h>
 #include <asm/time.h>
+#include <asm/machdep.h>
 #endif
 
 extern unsigned long _get_SP(void);
@@ -201,27 +201,15 @@ int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs)
 }
 #endif /* CONFIG_SPE */
 
-static void set_dabr_spr(unsigned long val)
-{
-	mtspr(SPRN_DABR, val);
-}
-
 int set_dabr(unsigned long dabr)
 {
-	int ret = 0;
-
 #ifdef CONFIG_PPC64
-	if (firmware_has_feature(FW_FEATURE_XDABR)) {
-		/* We want to catch accesses from kernel and userspace */
-		unsigned long flags = H_DABRX_KERNEL|H_DABRX_USER;
-		ret = plpar_set_xdabr(dabr, flags);
-	} else if (firmware_has_feature(FW_FEATURE_DABR)) {
-		ret = plpar_set_dabr(dabr);
-	} else
+	if (ppc_md.set_dabr)
+		return ppc_md.set_dabr(dabr);
 #endif
-		set_dabr_spr(dabr);
 
-	return ret;
+	mtspr(SPRN_DABR, dabr);
+	return 0;
 }
 
 #ifdef CONFIG_PPC64

arch/powerpc/platforms/pseries/setup.c

@@ -350,6 +350,16 @@ static void pSeries_mach_cpu_die(void)
 	for(;;);
 }
 
+static int pseries_set_dabr(unsigned long dabr)
+{
+	if (firmware_has_feature(FW_FEATURE_XDABR)) {
+		/* We want to catch accesses from kernel and userspace */
+		return plpar_set_xdabr(dabr, H_DABRX_KERNEL | H_DABRX_USER);
+	}
+
+	return plpar_set_dabr(dabr);
+}
+
 
 /*
  * Early initialization.  Relocation is on but do not reference unbolted pages
@@ -385,6 +395,8 @@ static void __init pSeries_init_early(void)
 		DBG("Hello World !\n");
 	}
 
+	if (firmware_has_feature(FW_FEATURE_XDABR | FW_FEATURE_DABR))
+		ppc_md.set_dabr = pseries_set_dabr;
 
 	iommu_init_early_pSeries();
 

include/asm-powerpc/machdep.h

@@ -80,6 +80,7 @@ struct machdep_calls {
 	void		(*iommu_dev_setup)(struct pci_dev *dev);
 	void		(*iommu_bus_setup)(struct pci_bus *bus);
 	void		(*irq_bus_setup)(struct pci_bus *bus);
+	int		(*set_dabr)(unsigned long dabr);
 #endif
 
 	int		(*probe)(int platform);