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Commit b40844aa authored by Frederic Barrat's avatar Frederic Barrat Committed by Michael Ellerman
Browse files

cxl: Parse device tree and create cxl device(s) at boot 



Add new entry point to scan the device tree at boot in a guest,
looking for cxl devices.

Co-authored-by: default avatarChristophe Lombard <clombard@linux.vnet.ibm.com>
Signed-off-by: default avatarFrederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: default avatarChristophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: default avatarManoj Kumar <manoj@linux.vnet.ibm.com>
Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 594ff7d0

drivers/misc/cxl/base.c

+25 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/rcupdate.h>

#include <asm/errno.h>

#include <misc/cxl-base.h>

#include <linux/of_platform.h>

#include "cxl.h"



/* protected by rcu */
@@ -91,3 +92,27 @@ int cxl_update_properties(struct device_node *dn, 
	return of_update_property(dn, new_prop);

}

EXPORT_SYMBOL_GPL(cxl_update_properties);



static int __init cxl_base_init(void)

{

	struct device_node *np = NULL;

	struct platform_device *dev;

	int count = 0;



	/*

	 * Scan for compatible devices in guest only

	 */

	if (cpu_has_feature(CPU_FTR_HVMODE))

		return 0;



	while ((np = of_find_compatible_node(np, NULL,

				     "ibm,coherent-platform-facility"))) {

		dev = of_platform_device_create(np, NULL, NULL);

		if (dev)

			count++;

	}

	pr_devel("Found %d cxl device(s)\n", count);

	return 0;

}



module_init(cxl_base_init);