[PATCH i-g-t v1 1/4] lib/xe/xe_sriov_provisioning: Add helper to read VF's configuration data

[Lukasz Laguna]

Add helper allowing to read configuration data that VF queried from GuC
during probe.

Signed-off-by: Lukasz Laguna <lukasz.laguna at intel.com>
---
 lib/xe/xe_sriov_provisioning.c | 80 ++++++++++++++++++++++++++++++++++
 lib/xe/xe_sriov_provisioning.h |  5 +++
 2 files changed, 85 insertions(+)

diff --git a/lib/xe/xe_sriov_provisioning.c b/lib/xe/xe_sriov_provisioning.c
index 22035ffd8..5ba348131 100644
--- a/lib/xe/xe_sriov_provisioning.c
+++ b/lib/xe/xe_sriov_provisioning.c
@@ -4,8 +4,10 @@
  */
 
 #include <errno.h>
+#include <fcntl.h>
 
 #include "igt_core.h"
+#include "igt_debugfs.h"
 #include "intel_chipset.h"
 #include "linux_scaffold.h"
 #include "xe/xe_mmio.h"
@@ -296,3 +298,81 @@ bool xe_sriov_is_shared_res_provisionable(int pf, enum xe_sriov_shared_res res,
 
 	return true;
 }
+
+/**
+ * __xe_sriov_vf_get_shared_res_selfconfig - Read VF's configuration data.
+ * @vf: VF device file descriptor
+ * @res: Shared resource type (see enum xe_sriov_shared_res)
+ * @gt_num: GT number
+ * @value: Pointer to store the read value
+ *
+ * Reads the specified shared resource @res from selfconfig of given VF device
+ * @vf on GT @gt_num.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int __xe_sriov_vf_get_shared_res_selfconfig(int vf, enum xe_sriov_shared_res res,
+					    unsigned int gt_num, uint64_t *value)
+{
+	FILE *file;
+	size_t n = 0;
+	char *line = NULL;
+	int fd, ret = 0;
+
+	fd = igt_debugfs_gt_open(vf, gt_num, "vf/self_config", O_RDONLY);
+	if (fd < 0)
+		return fd;
+	file = fdopen(fd, "r");
+	if (!file) {
+		close(fd);
+		return -errno;
+	}
+
+	while (getline(&line, &n, file) >= 0) {
+		switch (res) {
+		case XE_SRIOV_SHARED_RES_CONTEXTS:
+			ret = sscanf(line, "GuC contexts: %lu", value);
+			break;
+		case XE_SRIOV_SHARED_RES_DOORBELLS:
+			ret = sscanf(line, "GuC doorbells: %lu", value);
+			break;
+		case XE_SRIOV_SHARED_RES_GGTT:
+			ret = sscanf(line, "GGTT size: %lu", value);
+			break;
+		case XE_SRIOV_SHARED_RES_LMEM:
+			ret = sscanf(line, "LMEM size: %lu", value);
+			break;
+		}
+
+		if (ret > 0)
+			break;
+	}
+
+	free(line);
+	fclose(file);
+	close(fd);
+
+	return ret ? 0 : -1;
+}
+/**
+ * xe_sriov_vf_get_shared_res_selfconfig - Read VF's configuration data.
+ * @pf: PF device file descriptor
+ * @res: Shared resource type (see enum xe_sriov_shared_res)
+ * @gt_num: GT number
+ *
+ * A throwing version of __xe_sriov_vf_get_shared_res_selfconfig().
+ * Instead of returning an error code, it returns the quota value and asserts
+ * in case of an error.
+ *
+ * Return: The quota for the given shared resource.
+ *         Asserts in case of failure.
+ */
+uint64_t xe_sriov_vf_get_shared_res_selfconfig(int vf, enum xe_sriov_shared_res res,
+					       unsigned int gt_num)
+{
+	uint64_t value;
+
+	igt_fail_on(__xe_sriov_vf_get_shared_res_selfconfig(vf, res, gt_num, &value));
+
+	return value;
+}
diff --git a/lib/xe/xe_sriov_provisioning.h b/lib/xe/xe_sriov_provisioning.h
index b4300ec2e..1a05c2c59 100644
--- a/lib/xe/xe_sriov_provisioning.h
+++ b/lib/xe/xe_sriov_provisioning.h
@@ -90,4 +90,9 @@ void xe_sriov_pf_set_shared_res_attr(int pf, enum xe_sriov_shared_res res,
 				     unsigned int vf_num, unsigned int gt_num,
 				     uint64_t value);
 
+int __xe_sriov_vf_get_shared_res_selfconfig(int vf, enum xe_sriov_shared_res res,
+					    unsigned int gt_num, uint64_t *value);
+uint64_t xe_sriov_vf_get_shared_res_selfconfig(int vf, enum xe_sriov_shared_res res,
+					       unsigned int gt_num);
+
 #endif /* __XE_SRIOV_PROVISIONING_H__ */
-- 
2.40.0