[PATCH i-g-t 2/6] lib/xe_mmio: Add init flag and helper to check initialization

[Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>]

From: Piotr Piórkowski <piotr.piorkowski@intel.com>

Track MMIO initialization state via a new `init` flag and expose it
through xe_mmio_is_initialized().

Signed-off-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Cc: Lukasz Laguna <lukasz.laguna@intel.com>
Cc: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
Reviewed-by: Jan Sokolowski <jan.sokolowski@intel.com>
Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
---
 lib/xe/xe_mmio.c | 14 ++++++++++++++
 lib/xe/xe_mmio.h |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/lib/xe/xe_mmio.c b/lib/xe/xe_mmio.c
index b52e90dba..94e516417 100644
--- a/lib/xe/xe_mmio.c
+++ b/lib/xe/xe_mmio.c
@@ -25,6 +25,7 @@ void xe_mmio_vf_access_init(int pf_fd, int vf_id, struct xe_mmio *mmio)
 
 	intel_register_access_init(&mmio->intel_mmio, pci_dev, false);
 	mmio->fd = pf_fd;
+	mmio->init = true;
 }
 
 /**
@@ -39,6 +40,18 @@ void xe_mmio_access_init(int pf_fd, struct xe_mmio *mmio)
 	xe_mmio_vf_access_init(pf_fd, 0, mmio);
 }
 
+/**
+ * xe_mmio_is_initialized:
+ * @mmio: xe mmio structure for IO operations
+ *
+ * Returns:
+ * Non-zero if the xe mmio structure is initialized.
+ */
+bool xe_mmio_is_initialized(const struct xe_mmio *mmio)
+{
+	return mmio->init;
+}
+
 /**
  * xe_mmio_access_fini:
  * @mmio: xe mmio structure for IO operations
@@ -49,6 +62,7 @@ void xe_mmio_access_init(int pf_fd, struct xe_mmio *mmio)
 void xe_mmio_access_fini(struct xe_mmio *mmio)
 {
 	intel_register_access_fini(&mmio->intel_mmio);
+	mmio->init = false;
 }
 
 /**
diff --git a/lib/xe/xe_mmio.h b/lib/xe/xe_mmio.h
index 35cafa448..030c50a2e 100644
--- a/lib/xe/xe_mmio.h
+++ b/lib/xe/xe_mmio.h
@@ -16,11 +16,13 @@ typedef uint64_t xe_ggtt_pte_t;
 
 struct xe_mmio {
 	int fd;
+	bool init;
 	struct intel_mmio_data intel_mmio;
 };
 
 void xe_mmio_vf_access_init(int pf_fd, int vf_id, struct xe_mmio *mmio);
 void xe_mmio_access_init(int pf_fd, struct xe_mmio *mmio);
+bool xe_mmio_is_initialized(const struct xe_mmio *mmio);
 void xe_mmio_access_fini(struct xe_mmio *mmio);
 
 uint32_t xe_mmio_read32(struct xe_mmio *mmio, uint32_t offset);
-- 
2.43.0