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authorFrederic Barrat <fbarrat@linux.vnet.ibm.com>2016-03-04 12:26:39 +0100
committerMichael Ellerman <mpe@ellerman.id.au>2016-03-09 23:39:59 +1100
commitb40844aa55bb325de7509003c7529c75b0532412 (patch)
treeed8c4d693c684d38aa089928fb41dd98e6d2ac7e /drivers/misc
parent594ff7d067ca42676e27e2a7b5dcc0ff039d08ca (diff)
downloadlinux-b40844aa55bb325de7509003c7529c75b0532412.tar.bz2
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: Christophe Lombard <clombard@linux.vnet.ibm.com> Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com> Reviewed-by: Manoj Kumar <manoj@linux.vnet.ibm.com> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/cxl/base.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/misc/cxl/base.c b/drivers/misc/cxl/base.c
index 957f4dd23f40..9b90ec6c07cd 100644
--- a/drivers/misc/cxl/base.c
+++ b/drivers/misc/cxl/base.c
@@ -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);