drm/xe: Allow to assign GGTT region to the VF

VF's drivers can't modify GGTT PTEs except the range explicitly
assigned by the PF driver. To allow hardware enforcement of this
requirement, each GGTT PTE has a field with the VF number that
identifies which VF can modify that particular GGTT PTE entry.

Only PF driver can modify this field and PF driver shall do that
before VF drivers will be loaded. Add function to prepare PTEs.
Since it will be used only by the PF driver, make it available
only for CONFIG_PCI_IOV=y.

Bspec: 45015, 52395
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240415173937.1287-3-michal.wajdeczko@intel.com

diff --git a/drivers/gpu/drm/xe/regs/xe_gtt_defs.h b/drivers/gpu/drm/xe/regs/xe_gtt_defs.h
index 558519c..4389e5a 100644 (file)
--- a/drivers/gpu/drm/xe/regs/xe_gtt_defs.h
+++ b/drivers/gpu/drm/xe/regs/xe_gtt_defs.h
@@ -9,6 +9,8 @@
 #define XELPG_GGTT_PTE_PAT0    BIT_ULL(52)
 #define XELPG_GGTT_PTE_PAT1    BIT_ULL(53)
 
+#define GGTT_PTE_VFID          GENMASK_ULL(11, 2)
+
 #define GUC_GGTT_TOP           0xFEE00000
 
 #define XELPG_PPGTT_PTE_PAT3           BIT_ULL(62)

diff --git a/drivers/gpu/drm/xe/xe_ggtt.c b/drivers/gpu/drm/xe/xe_ggtt.c
index ff2239c..f090cab 100644 (file)
--- a/drivers/gpu/drm/xe/xe_ggtt.c
+++ b/drivers/gpu/drm/xe/xe_ggtt.c
@@ -460,6 +460,50 @@ void xe_ggtt_remove_bo(struct xe_ggtt *ggtt, struct xe_bo *bo)
                            bo->flags & XE_BO_FLAG_GGTT_INVALIDATE);
 }
 
+#ifdef CONFIG_PCI_IOV
+static u64 xe_encode_vfid_pte(u16 vfid)
+{
+       return FIELD_PREP(GGTT_PTE_VFID, vfid) | XE_PAGE_PRESENT;
+}
+
+static void xe_ggtt_assign_locked(struct xe_ggtt *ggtt, const struct drm_mm_node *node, u16 vfid)
+{
+       u64 start = node->start;
+       u64 size = node->size;
+       u64 end = start + size - 1;
+       u64 pte = xe_encode_vfid_pte(vfid);
+
+       lockdep_assert_held(&ggtt->lock);
+
+       if (!drm_mm_node_allocated(node))
+               return;
+
+       while (start < end) {
+               xe_ggtt_set_pte(ggtt, start, pte);
+               start += XE_PAGE_SIZE;
+       }
+
+       xe_ggtt_invalidate(ggtt);
+}
+
+/**
+ * xe_ggtt_assign - assign a GGTT region to the VF
+ * @ggtt: the &xe_ggtt where the node belongs
+ * @node: the &drm_mm_node to update
+ * @vfid: the VF identifier
+ *
+ * This function is used by the PF driver to assign a GGTT region to the VF.
+ * In addition to PTE's VFID bits 11:2 also PRESENT bit 0 is set as on some
+ * platforms VFs can't modify that either.
+ */
+void xe_ggtt_assign(struct xe_ggtt *ggtt, const struct drm_mm_node *node, u16 vfid)
+{
+       mutex_lock(&ggtt->lock);
+       xe_ggtt_assign_locked(ggtt, node, vfid);
+       mutex_unlock(&ggtt->lock);
+}
+#endif
+
 int xe_ggtt_dump(struct xe_ggtt *ggtt, struct drm_printer *p)
 {
        int err;

diff --git a/drivers/gpu/drm/xe/xe_ggtt.h b/drivers/gpu/drm/xe/xe_ggtt.h
index 8306ef7..4a41a17 100644 (file)
--- a/drivers/gpu/drm/xe/xe_ggtt.h
+++ b/drivers/gpu/drm/xe/xe_ggtt.h
@@ -33,4 +33,8 @@ void xe_ggtt_remove_bo(struct xe_ggtt *ggtt, struct xe_bo *bo);
 
 int xe_ggtt_dump(struct xe_ggtt *ggtt, struct drm_printer *p);
 
+#ifdef CONFIG_PCI_IOV
+void xe_ggtt_assign(struct xe_ggtt *ggtt, const struct drm_mm_node *node, u16 vfid);
+#endif
+
 #endif