lib/igt_pm : Add pm functions for d3cold_allowed

Add functions to set/get d3cold_allowed attribute of
the pci_device

v2 :  Add forward declaration in header (Anshuman)

Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>

lib/igt_pm.c

@@ -38,6 +38,7 @@
 #include <dirent.h>
 
 #include "drmtest.h"
+#include "igt_device_scan.h"
 #include "igt_kms.h"
 #include "igt_pm.h"
 #include "igt_aux.h"
@@ -1122,6 +1123,52 @@ void igt_pm_setup_pci_card_runtime_pm(struct pci_device *pci_dev)
 	igt_pm_setup_pci_card_power_attrs(pci_dev, true, 0);
 }
 
+/**
+ * igt_pm_get_d3cold_allowed:
+ * @igt_device_card: device card
+ * @val: value to be read into
+ *
+ * Reads the value of d3cold_allowed attribute
+ * of the pci device
+ */
+void igt_pm_get_d3cold_allowed(struct igt_device_card *card, char *val)
+{
+	char name[PATH_MAX];
+	int fd;
+
+	snprintf(name, PATH_MAX, "/sys/bus/pci/devices/%s",
+		 card->pci_slot_name);
+
+	fd = open(name, O_RDONLY);
+	igt_assert_f(fd >= 0, "Can't open %s\n", name);
+
+	igt_sysfs_read(fd, "d3cold_allowed", val, sizeof(val));
+
+	close(fd);
+}
+
+/**
+ * igt_pm_get_d3cold_allowed:
+ * @igt_device_card: device card
+ * @val: value to be written
+ *
+ * writes the value to d3cold_allowed attribute of pci device
+ */
+void igt_pm_set_d3cold_allowed(struct igt_device_card *card, const char *val)
+{
+	char name[PATH_MAX];
+	int fd;
+
+	snprintf(name, PATH_MAX, "/sys/bus/pci/devices/%s",
+		 card->pci_slot_name);
+
+	fd = open(name, O_RDONLY);
+	igt_assert_f(fd >= 0, "Can't open %s\n", name);
+
+	igt_sysfs_write(fd, "d3cold_allowed", val, sizeof(val));
+	close(fd);
+}
+
 static void
 igt_pm_restore_power_attr(struct pci_device *pci_dev, const char *attr, char *val, int len)
 {

lib/igt_pm.h

@@ -63,6 +63,8 @@ struct	igt_pm_pci_dev_pwrattr {
 	char autosuspend_delay[64];
 };
 
+struct igt_device_card;
+
 bool igt_setup_runtime_pm(int device);
 void igt_disable_runtime_pm(void);
 void igt_restore_runtime_pm(void);
@@ -76,6 +78,8 @@ enum igt_acpi_d_state
 igt_pm_get_acpi_real_d_state(struct pci_device *pci_dev);
 void igt_pm_enable_pci_card_runtime_pm(struct pci_device *root,
 				       struct pci_device *i915);
+void igt_pm_get_d3cold_allowed(struct igt_device_card *card, char *val);
+void igt_pm_set_d3cold_allowed(struct igt_device_card *card, const char *val);
 void igt_pm_setup_pci_card_runtime_pm(struct pci_device *pci_dev);
 void igt_pm_restore_pci_card_runtime_pm(void);
 void igt_pm_print_pci_card_runtime_status(void);