[PATCH v2 07/43] drm/xe: Add xe_tile backpointer to xe_mmio

[Matt Roper]

Once MMIO operations stop being (incorrectly) tied to a GT, we'll still
need a backpointer for feature checks, message logging, and tracepoints.
Use a tile backpointer since that may allow the most useful debugging
output, while also providing access to the xe_device.

v2:
 - Make backpointer an xe_tile instead of xe_device.  (Michal)

Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>  # v1
---
 drivers/gpu/drm/xe/xe_device_types.h | 3 +++
 drivers/gpu/drm/xe/xe_mmio.c         | 3 +++
 drivers/gpu/drm/xe/xe_pci.c          | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index e6675e9ba6e1..27fd16bedb4a 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -115,6 +115,9 @@ struct xe_mem_region {
  * subregions of the overall IO space).
  */
 struct xe_mmio {
+	/** @tile: Backpointer to tile, used for tracing */
+	struct xe_tile *tile;
+
 	/** @regs: Map used to access registers. */
 	void __iomem *regs;
 
diff --git a/drivers/gpu/drm/xe/xe_mmio.c b/drivers/gpu/drm/xe/xe_mmio.c
index 2f72516e0132..46924f404241 100644
--- a/drivers/gpu/drm/xe/xe_mmio.c
+++ b/drivers/gpu/drm/xe/xe_mmio.c
@@ -98,6 +98,7 @@ static void mmio_multi_tile_setup(struct xe_device *xe, size_t tile_mmio_size)
 	for_each_tile(tile, xe, id) {
 		tile->mmio.regs_size = SZ_4M;
 		tile->mmio.regs = regs;
+		tile->mmio.tile = tile;
 		regs += tile_mmio_size;
 	}
 }
@@ -134,6 +135,7 @@ static void mmio_extension_setup(struct xe_device *xe, size_t tile_mmio_size,
 	for_each_tile(tile, xe, id) {
 		tile->mmio_ext.regs_size = tile_mmio_ext_size;
 		tile->mmio_ext.regs = regs;
+		tile->mmio_ext.tile = tile;
 		regs += tile_mmio_ext_size;
 	}
 }
@@ -180,6 +182,7 @@ int xe_mmio_init(struct xe_device *xe)
 	/* Setup first tile; other tiles (if present) will be setup later. */
 	root_tile->mmio.regs_size = SZ_4M;
 	root_tile->mmio.regs = xe->mmio.regs;
+	root_tile->mmio.tile = root_tile;
 
 	return devm_add_action_or_reset(xe->drm.dev, mmio_fini, xe);
 }
diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index 5a6833bf9f56..9914d7d4b9de 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -718,6 +718,7 @@ static int xe_info_init(struct xe_device *xe,
 		gt->info.engine_mask = graphics_desc->hw_engine_mask;
 		gt->mmio.regs = tile->mmio.regs;
 		gt->mmio.regs_size = tile->mmio.regs_size;
+		gt->mmio.tile = tile;
 		if (MEDIA_VER(xe) < 13 && media_desc)
 			gt->info.engine_mask |= media_desc->hw_engine_mask;
 
@@ -740,6 +741,7 @@ static int xe_info_init(struct xe_device *xe,
 		gt->mmio.regs_size = tile->mmio.regs_size;
 		gt->mmio.adj_offset = MEDIA_GT_GSI_OFFSET;
 		gt->mmio.adj_limit = MEDIA_GT_GSI_LENGTH;
+		gt->mmio.tile = tile;
 
 		/*
 		 * FIXME: At the moment multi-tile and standalone media are
-- 
2.45.2