SGX-KM: egl.cfg sysfs entry

Create a runtime sysfs entry for egl.cfg. This is needed
by the SGX driver to determine which OpenGL libraries
to load.

Change-Id: Ief39f498721d0ad71942f8a49fcfefc4c449d656
Signed-off-by: Tate Hornbeck <tate.hornbeck@ti.com>

4 files changed, 88 insertions, 0 deletions

diff --git a/drivers/gpu/pvr/Makefile b/drivers/gpu/pvr/Makefile
index 4fad869..6e0b333 100644
--- a/drivers/gpu/pvr/Makefile
+++ b/drivers/gpu/pvr/Makefile
@@ -99,6 +99,7 @@ pvrsrvkm-y := \
 	perproc.o \
 	lists.o \
 	refcount.o \
+	sysfs.o \
 	omap4/sysconfig.o \
 	omap4/sysutils.o \
 	sgx/bridged_sgx_bridge.o \
diff --git a/drivers/gpu/pvr/pvrsrv.c b/drivers/gpu/pvr/pvrsrv.c
index af2b6eb..2cea16f 100644
--- a/drivers/gpu/pvr/pvrsrv.c
+++ b/drivers/gpu/pvr/pvrsrv.c
@@ -32,6 +32,7 @@
 #include "pdump_km.h"
 #include "deviceid.h"
 #include "ra.h"
+#include "sysfs.h"
 #if defined(TTRACE)
 #include "ttrace.h"
 #endif
@@ -202,6 +203,12 @@ PVRSRV_ERROR IMG_CALLCONV PVRSRVInit(PSYS_DATA psSysData)
 {
 	PVRSRV_ERROR	eError;
 
+	eError = PVRSRVCreateSysfsEntry();
+	if (eError != PVRSRV_OK)
+	{
+		goto Error;
+	}
+
 	
 	eError = ResManInit();
 	if (eError != PVRSRV_OK)
diff --git a/drivers/gpu/pvr/sysfs.c b/drivers/gpu/pvr/sysfs.c
new file mode 100644
index 0000000..d3fd69c
--- /dev/null
+++ b/drivers/gpu/pvr/sysfs.c
@@ -0,0 +1,79 @@
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
+#include <linux/stat.h>
+#include <asm/page.h>
+#include <linux/slab.h>
+#include "services_headers.h"
+#include "pdump_km.h"
+#include "sysfs.h"
+
+/* sysfs structures */
+struct pvrsrv_attribute {
+	struct attribute attr;
+	int sgx_version;
+	int sgx_revision;
+};
+
+static struct pvrsrv_attribute PVRSRVAttr = {
+	.attr.name = "egl.cfg",
+	.attr.mode = S_IRUGO,
+#if defined(SGX544)
+	.sgx_version = 544,
+	.sgx_revision = 112,
+#else
+	.sgx_version = 540,
+	.sgx_revision = 120,
+#endif
+};
+
+/* sysfs read function */
+static ssize_t PVRSRVEglCfgShow(struct kobject *kobj, struct attribute *attr,
+								char *buffer) {
+	struct pvrsrv_attribute *pvrsrv_attr;
+
+	pvrsrv_attr = container_of(attr, struct pvrsrv_attribute, attr);
+	return snprintf(buffer, PAGE_SIZE, "0 0 android\n0 1 POWERVR_SGX%d_%d",
+			pvrsrv_attr->sgx_version, pvrsrv_attr->sgx_revision);
+}
+
+/* sysfs write function unsupported*/
+static ssize_t PVRSRVEglCfgStore(struct kobject *kobj, struct attribute *attr,
+					const char *buffer, size_t size) {
+	PVR_DPF((PVR_DBG_ERROR, "PVRSRVEglCfgStore not implemented"));
+	return 0;
+}
+
+static struct attribute *pvrsrv_sysfs_attrs[] = {
+	&PVRSRVAttr.attr,
+	NULL
+};
+
+static const struct sysfs_ops pvrsrv_sysfs_ops = {
+	.show = PVRSRVEglCfgShow,
+	.store = PVRSRVEglCfgStore,
+};
+
+static struct kobj_type pvrsrv_ktype = {
+	.sysfs_ops = &pvrsrv_sysfs_ops,
+	.default_attrs = pvrsrv_sysfs_attrs,
+};
+
+/* create sysfs entry /sys/egl/egl.cfg to determine
+   which gfx libraries to load */
+
+int PVRSRVCreateSysfsEntry(void)
+{
+	struct kobject *egl_cfg_kobject;
+	int r;
+
+	egl_cfg_kobject = kzalloc(sizeof(*egl_cfg_kobject), GFP_KERNEL);
+	r = kobject_init_and_add(egl_cfg_kobject, &pvrsrv_ktype, NULL, "egl");
+
+	if (r) {
+		PVR_DPF((PVR_DBG_ERROR,
+			"Failed to create egl.cfg sysfs entry"));
+		return PVRSRV_ERROR_INIT_FAILURE;
+	}
+
+	return PVRSRV_OK;
+}
diff --git a/drivers/gpu/pvr/sysfs.h b/drivers/gpu/pvr/sysfs.h
new file mode 100644
index 0000000..66fb99d
--- /dev/null
+++ b/drivers/gpu/pvr/sysfs.h
@@ -0,0 +1 @@
+int PVRSRVCreateSysfsEntry(void);