[PATCH v3 08/43] drm/xe: Adjust mmio code to pass VF substructure to SRIOV code

[Matt Roper]

Although we want to break the GT-centric nature of the MMIO code in the
general driver, the SRIOV handling still relies on data in a VF
substructure of the GT.  So add a GT backpointer, but name it
sriov_vf_gt to make it clear that it's only for this one specific
special case and will not be set or usable for anything else.

v2:
 - Store backpointer to the GT itself rather than the SRIOV-specific
   substructure.  (Michal)

Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>  # v1
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/xe/xe_device_types.h | 8 ++++++++
 drivers/gpu/drm/xe/xe_pci.c          | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 3a23083ec3cf..c92df0a2423f 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -121,6 +121,14 @@ struct xe_mmio {
 	/** @regs: Map used to access registers. */
 	void __iomem *regs;
 
+	/**
+	 * @sriov_vf_gt: Backpointer to GT.
+	 *
+	 * This pointer is only set for GT MMIO regions and only when running
+	 * as an SRIOV VF structure
+	 */
+	struct xe_gt *sriov_vf_gt;
+
 	/**
 	 * @regs_size: Length of the register region within the map.
 	 *
diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index 9914d7d4b9de..aa0c29450b4a 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -719,6 +719,9 @@ static int xe_info_init(struct xe_device *xe,
 		gt->mmio.regs = tile->mmio.regs;
 		gt->mmio.regs_size = tile->mmio.regs_size;
 		gt->mmio.tile = tile;
+		if (IS_SRIOV_VF(xe))
+			gt->mmio.sriov_vf_gt = gt;
+
 		if (MEDIA_VER(xe) < 13 && media_desc)
 			gt->info.engine_mask |= media_desc->hw_engine_mask;
 
@@ -742,6 +745,8 @@ static int xe_info_init(struct xe_device *xe,
 		gt->mmio.adj_offset = MEDIA_GT_GSI_OFFSET;
 		gt->mmio.adj_limit = MEDIA_GT_GSI_LENGTH;
 		gt->mmio.tile = tile;
+		if (IS_SRIOV_VF(xe))
+			gt->mmio.sriov_vf_gt = gt;
 
 		/*
 		 * FIXME: At the moment multi-tile and standalone media are
-- 
2.45.2