accel/ivpu: Add support for userptr buffer objects

Introduce a new ioctl `drm_ivpu_bo_create_from_userptr` that allows
users to create GEM buffer objects from user pointers to memory regions.
The user pointer must be page-aligned and the memory region must remain
valid for the buffer object's lifetime.

Userptr buffers enable direct use of mmapped files (e.g. inference
weights) in NPU workloads without copying data to NPU buffer objects.
This reduces memory usage and provides better flexibility for NPU
applications.

Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Link: https://patch.msgid.link/20251029091752.203198-1-karol.wachowski@linux.intel.com

1 files changed, 52 insertions, 0 deletions

diff --git a/include/uapi/drm/ivpu_accel.h b/include/uapi/drm/ivpu_accel.h
index e470b0221e02..264505d54f93 100644
--- a/include/uapi/drm/ivpu_accel.h
+++ b/include/uapi/drm/ivpu_accel.h
@@ -25,6 +25,7 @@ extern "C" {
 #define DRM_IVPU_CMDQ_CREATE              0x0b
 #define DRM_IVPU_CMDQ_DESTROY             0x0c
 #define DRM_IVPU_CMDQ_SUBMIT              0x0d
+#define DRM_IVPU_BO_CREATE_FROM_USERPTR	  0x0e
 
 #define DRM_IOCTL_IVPU_GET_PARAM                                               \
 	DRM_IOWR(DRM_COMMAND_BASE + DRM_IVPU_GET_PARAM, struct drm_ivpu_param)
@@ -69,6 +70,10 @@ extern "C" {
 #define DRM_IOCTL_IVPU_CMDQ_SUBMIT                                             \
 	DRM_IOW(DRM_COMMAND_BASE + DRM_IVPU_CMDQ_SUBMIT, struct drm_ivpu_cmdq_submit)
 
+#define DRM_IOCTL_IVPU_BO_CREATE_FROM_USERPTR                        \
+	DRM_IOWR(DRM_COMMAND_BASE + DRM_IVPU_BO_CREATE_FROM_USERPTR, \
+		 struct drm_ivpu_bo_create_from_userptr)
+
 /**
  * DOC: contexts
  *
@@ -127,6 +132,13 @@ extern "C" {
  * command queue destroy and submit job on specific command queue.
  */
 #define DRM_IVPU_CAP_MANAGE_CMDQ       3
+/**
+ * DRM_IVPU_CAP_BO_CREATE_FROM_USERPTR
+ *
+ * Driver supports creating buffer objects from user space memory pointers.
+ * This allows creating GEM buffers from existing user memory regions.
+ */
+#define DRM_IVPU_CAP_BO_CREATE_FROM_USERPTR	4
 
 /**
  * struct drm_ivpu_param - Get/Set VPU parameters
@@ -194,6 +206,7 @@ struct drm_ivpu_param {
 #define DRM_IVPU_BO_HIGH_MEM   DRM_IVPU_BO_SHAVE_MEM
 #define DRM_IVPU_BO_MAPPABLE   0x00000002
 #define DRM_IVPU_BO_DMA_MEM    0x00000004
+#define DRM_IVPU_BO_READ_ONLY  0x00000008
 
 #define DRM_IVPU_BO_CACHED     0x00000000
 #define DRM_IVPU_BO_UNCACHED   0x00010000
@@ -204,6 +217,7 @@ struct drm_ivpu_param {
 	(DRM_IVPU_BO_HIGH_MEM | \
 	 DRM_IVPU_BO_MAPPABLE | \
 	 DRM_IVPU_BO_DMA_MEM | \
+	 DRM_IVPU_BO_READ_ONLY | \
 	 DRM_IVPU_BO_CACHE_MASK)
 
 /**
@@ -256,6 +270,44 @@ struct drm_ivpu_bo_create {
 };
 
 /**
+ * struct drm_ivpu_bo_create_from_userptr - Create dma-buf from user pointer
+ *
+ * Create a GEM buffer object from a user pointer to a memory region.
+ */
+struct drm_ivpu_bo_create_from_userptr {
+	/** @user_ptr: User pointer to memory region (must be page aligned) */
+	__u64 user_ptr;
+
+	/** @size: Size of the memory region in bytes (must be page aligned) */
+	__u64 size;
+
+	/**
+	 * @flags:
+	 *
+	 * Supported flags:
+	 *
+	 * %DRM_IVPU_BO_HIGH_MEM:
+	 *
+	 * Allocate VPU address from >4GB range.
+	 *
+	 * %DRM_IVPU_BO_DMA_MEM:
+	 *
+	 * Allocate from DMA memory range accessible by hardware DMA.
+	 *
+	 * %DRM_IVPU_BO_READ_ONLY:
+	 *
+	 * Allocate as a read-only buffer object.
+	 */
+	__u32 flags;
+
+	/** @handle: Returned GEM object handle */
+	__u32 handle;
+
+	/** @vpu_addr: Returned VPU virtual address */
+	__u64 vpu_addr;
+};
+
+/**
  * struct drm_ivpu_bo_info - Query buffer object info
  */
 struct drm_ivpu_bo_info {