drm/xe: Adjust mmio code to pass VF substructure to SRIOV code

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@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>  # v1
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240910234719.3335472-53-matthew.d.roper@intel.com

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 3a23083ec3cf16382386fdc4eaf0904ef87dde62..c92df0a2423f9b116def93d85cf7e86522b3c60f 100644 (file)
--- 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 d68f5685071dae8e99cba2a0fd85e9405e5c4907..d045ea68c808fc5ec19222521b675bd3fd4cf298 100644 (file)
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -714,6 +714,9 @@ 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;
 
@@ -737,6 +740,8 @@ 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