Merge tag 'drm-misc-next-fixes-2025-11-26' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

drm-misc-next-fixes for v6.19:
- Restrict the pointer size of flush pages to prevent a regression.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patch.msgid.link/0090a4fc-9cc4-4c03-bfe5-d1b1f0cc7e05@linux.intel.com

Author: airlied

drivers/gpu/drm/nouveau/nvkm/subdev/fb/base.c

@@ -279,7 +279,7 @@ nvkm_fb_ctor(const struct nvkm_fb_func *func, struct nvkm_device *device,
 	mutex_init(&fb->tags.mutex);
 
 	if (func->sysmem.flush_page_init) {
-		fb->sysmem.flush_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+		fb->sysmem.flush_page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
 		if (!fb->sysmem.flush_page)
 			return -ENOMEM;
 

drivers/gpu/drm/nouveau/nvkm/subdev/fb/gb100.c

@@ -15,6 +15,9 @@ gb100_fb_sysmem_flush_page_init(struct nvkm_fb *fb)
 	const u32 hshub = DRF_LO(NV_PFB_HSHUB0);
 	struct nvkm_device *device = fb->subdev.device;
 
+	// Ensure that the address is within hardware limits
+	WARN_ON(fb->sysmem.flush_page_addr > DMA_BIT_MASK(52));
+
 	nvkm_wr32(device, hshub + NV_PFB_HSHUB_PCIE_FLUSH_SYSMEM_ADDR_HI, addr_hi);
 	nvkm_wr32(device, hshub + NV_PFB_HSHUB_PCIE_FLUSH_SYSMEM_ADDR_LO, addr_lo);
 	nvkm_wr32(device, hshub + NV_PFB_HSHUB_EG_PCIE_FLUSH_SYSMEM_ADDR_HI, addr_hi);

drivers/gpu/drm/nouveau/nvkm/subdev/fb/gb202.c

@@ -13,6 +13,9 @@ gb202_fb_sysmem_flush_page_init(struct nvkm_fb *fb)
 	struct nvkm_device *device = fb->subdev.device;
 	const u64 addr = fb->sysmem.flush_page_addr;
 
+	// Ensure that the address is within hardware limits
+	WARN_ON(fb->sysmem.flush_page_addr > DMA_BIT_MASK(52));
+
 	nvkm_wr32(device, NV_PFB_FBHUB0_PCIE_FLUSH_SYSMEM_ADDR_HI, upper_32_bits(addr));
 	nvkm_wr32(device, NV_PFB_FBHUB0_PCIE_FLUSH_SYSMEM_ADDR_LO, lower_32_bits(addr));
 }

drivers/gpu/drm/nouveau/nvkm/subdev/fb/gf100.c

@@ -80,6 +80,9 @@ gf100_fb_init_page(struct nvkm_fb *fb)
 void
 gf100_fb_sysmem_flush_page_init(struct nvkm_fb *fb)
 {
+	// Ensure that the address can actually fit in the register
+	WARN_ON(fb->sysmem.flush_page_addr > DMA_BIT_MASK(40));
+
 	nvkm_wr32(fb->subdev.device, 0x100c10, fb->sysmem.flush_page_addr >> 8);
 }
 

drivers/gpu/drm/nouveau/nvkm/subdev/fb/gh100.c

@@ -13,6 +13,9 @@ gh100_fb_sysmem_flush_page_init(struct nvkm_fb *fb)
 	const u64 addr = fb->sysmem.flush_page_addr >> NV_PFB_NISO_FLUSH_SYSMEM_ADDR_SHIFT;
 	struct nvkm_device *device = fb->subdev.device;
 
+	// Ensure that the address is within hardware limits
+	WARN_ON(fb->sysmem.flush_page_addr > DMA_BIT_MASK(52));
+
 	nvkm_wr32(device, NV_PFB_FBHUB_PCIE_FLUSH_SYSMEM_ADDR_HI, upper_32_bits(addr));
 	nvkm_wr32(device, NV_PFB_FBHUB_PCIE_FLUSH_SYSMEM_ADDR_LO, lower_32_bits(addr));
 }

drivers/gpu/drm/nouveau/nvkm/subdev/fb/nv50.c

@@ -214,6 +214,9 @@ nv50_fb_tags(struct nvkm_fb *base)
 static void
 nv50_fb_sysmem_flush_page_init(struct nvkm_fb *fb)
 {
+	// Ensure that the address can actually fit in the register
+	WARN_ON(fb->sysmem.flush_page_addr > DMA_BIT_MASK(40));
+
 	nvkm_wr32(fb->subdev.device, 0x100c08, fb->sysmem.flush_page_addr >> 8);
 }