drm, drm/xe: Fix xe userptr in the absence of CONFIG_DEVICE_PRIVATE

CONFIG_DEVICE_PRIVATE is not selected by default by some distros,
for example Fedora, and that leads to a regression in the xe driver
since userptr support gets compiled out.

It turns out that DRM_GPUSVM, which is needed for xe userptr support
compiles also without CONFIG_DEVICE_PRIVATE, but doesn't compile
without CONFIG_ZONE_DEVICE.
Exclude the drm_pagemap files from compilation with !CONFIG_ZONE_DEVICE,
and remove the CONFIG_DEVICE_PRIVATE dependency from CONFIG_DRM_GPUSVM and
the xe driver's selection of it, re-enabling xe userptr for those configs.

v2:
- Don't compile the drm_pagemap files unless CONFIG_ZONE_DEVICE is set.
- Adjust the drm_pagemap.h header accordingly.

Fixes: 9e9787414882 ("drm/xe/userptr: replace xe_hmm with gpusvm")
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v6.18+
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patch.msgid.link/20260121091048.41371-2-thomas.hellstrom@linux.intel.com
(cherry picked from commit 1e372b246199ca7a35f930177fea91b557dac16e)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

1 files changed, 17 insertions, 2 deletions

diff --git a/include/drm/drm_pagemap.h b/include/drm/drm_pagemap.h
index 70a7991f784f..eb29e5309f0a 100644
--- a/include/drm/drm_pagemap.h
+++ b/include/drm/drm_pagemap.h
@@ -209,6 +209,19 @@ struct drm_pagemap_devmem_ops {
 			   struct dma_fence *pre_migrate_fence);
 };
 
+#if IS_ENABLED(CONFIG_ZONE_DEVICE)
+
+struct drm_pagemap *drm_pagemap_page_to_dpagemap(struct page *page);
+
+#else
+
+static inline struct drm_pagemap *drm_pagemap_page_to_dpagemap(struct page *page)
+{
+	return NULL;
+}
+
+#endif /* IS_ENABLED(CONFIG_ZONE_DEVICE) */
+
 /**
  * struct drm_pagemap_devmem - Structure representing a GPU SVM device memory allocation
  *
@@ -233,6 +246,8 @@ struct drm_pagemap_devmem {
 	struct dma_fence *pre_migrate_fence;
 };
 
+#if IS_ENABLED(CONFIG_ZONE_DEVICE)
+
 int drm_pagemap_migrate_to_devmem(struct drm_pagemap_devmem *devmem_allocation,
 				  struct mm_struct *mm,
 				  unsigned long start, unsigned long end,
@@ -243,8 +258,6 @@ int drm_pagemap_evict_to_ram(struct drm_pagemap_devmem *devmem_allocation);
 
 const struct dev_pagemap_ops *drm_pagemap_pagemap_ops_get(void);
 
-struct drm_pagemap *drm_pagemap_page_to_dpagemap(struct page *page);
-
 void drm_pagemap_devmem_init(struct drm_pagemap_devmem *devmem_allocation,
 			     struct device *dev, struct mm_struct *mm,
 			     const struct drm_pagemap_devmem_ops *ops,
@@ -256,4 +269,6 @@ int drm_pagemap_populate_mm(struct drm_pagemap *dpagemap,
 			    struct mm_struct *mm,
 			    unsigned long timeslice_ms);
 
+#endif /* IS_ENABLED(CONFIG_ZONE_DEVICE) */
+
 #endif