accel/ivpu: Add GEM buffer object management

Adds four types of GEM-based BOs for the VPU:
  - shmem
  - internal
  - prime

All types are implemented as struct ivpu_bo, based on
struct drm_gem_object. VPU address is allocated when buffer is created
except for imported prime buffers that allocate it in BO_INFO IOCTL due
to missing file_priv arg in gem_prime_import callback.
Internal buffers are pinned on creation, the rest of buffers types
can be pinned on demand (in SUBMIT IOCTL).
Buffer VPU address, allocated pages and mappings are released when the
buffer is destroyed.
Eviction mechanism is planned for future versions.

Add two new IOCTLs: BO_CREATE, BO_INFO

Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20230117092723.60441-4-jacek.lawrynowicz@linux.intel.com

1 files changed, 94 insertions, 0 deletions

diff --git a/include/uapi/drm/ivpu_accel.h b/include/uapi/drm/ivpu_accel.h
index 543347df51a1..093b83c5697e 100644
--- a/include/uapi/drm/ivpu_accel.h
+++ b/include/uapi/drm/ivpu_accel.h
@@ -17,6 +17,8 @@ extern "C" {
 
 #define DRM_IVPU_GET_PARAM		  0x00
 #define DRM_IVPU_SET_PARAM		  0x01
+#define DRM_IVPU_BO_CREATE		  0x02
+#define DRM_IVPU_BO_INFO		  0x03
 
 #define DRM_IOCTL_IVPU_GET_PARAM                                               \
 	DRM_IOWR(DRM_COMMAND_BASE + DRM_IVPU_GET_PARAM, struct drm_ivpu_param)
@@ -24,6 +26,12 @@ extern "C" {
 #define DRM_IOCTL_IVPU_SET_PARAM                                               \
 	DRM_IOW(DRM_COMMAND_BASE + DRM_IVPU_SET_PARAM, struct drm_ivpu_param)
 
+#define DRM_IOCTL_IVPU_BO_CREATE                                               \
+	DRM_IOWR(DRM_COMMAND_BASE + DRM_IVPU_BO_CREATE, struct drm_ivpu_bo_create)
+
+#define DRM_IOCTL_IVPU_BO_INFO                                                 \
+	DRM_IOWR(DRM_COMMAND_BASE + DRM_IVPU_BO_INFO, struct drm_ivpu_bo_info)
+
 /**
  * DOC: contexts
  *
@@ -92,6 +100,92 @@ struct drm_ivpu_param {
 	__u64 value;
 };
 
+#define DRM_IVPU_BO_HIGH_MEM   0x00000001
+#define DRM_IVPU_BO_MAPPABLE   0x00000002
+
+#define DRM_IVPU_BO_CACHED     0x00000000
+#define DRM_IVPU_BO_UNCACHED   0x00010000
+#define DRM_IVPU_BO_WC	       0x00020000
+#define DRM_IVPU_BO_CACHE_MASK 0x00030000
+
+#define DRM_IVPU_BO_FLAGS \
+	(DRM_IVPU_BO_HIGH_MEM | \
+	 DRM_IVPU_BO_MAPPABLE | \
+	 DRM_IVPU_BO_CACHE_MASK)
+
+/**
+ * struct drm_ivpu_bo_create - Create BO backed by SHMEM
+ *
+ * Create GEM buffer object allocated in SHMEM memory.
+ */
+struct drm_ivpu_bo_create {
+	/** @size: The size in bytes of the allocated memory */
+	__u64 size;
+
+	/**
+	 * @flags:
+	 *
+	 * Supported flags:
+	 *
+	 * %DRM_IVPU_BO_HIGH_MEM:
+	 *
+	 * Allocate VPU address from >4GB range.
+	 * Buffer object with vpu address >4GB can be always accessed by the
+	 * VPU DMA engine, but some HW generation may not be able to access
+	 * this memory from then firmware running on the VPU management processor.
+	 * Suitable for input, output and some scratch buffers.
+	 *
+	 * %DRM_IVPU_BO_MAPPABLE:
+	 *
+	 * Buffer object can be mapped using mmap().
+	 *
+	 * %DRM_IVPU_BO_CACHED:
+	 *
+	 * Allocated BO will be cached on host side (WB) and snooped on the VPU side.
+	 * This is the default caching mode.
+	 *
+	 * %DRM_IVPU_BO_UNCACHED:
+	 *
+	 * Allocated BO will not be cached on host side nor snooped on the VPU side.
+	 *
+	 * %DRM_IVPU_BO_WC:
+	 *
+	 * Allocated BO will use write combining buffer for writes but reads will be
+	 * uncached.
+	 */
+	__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 {
+	/** @handle: Handle of the queried BO */
+	__u32 handle;
+
+	/** @flags: Returned flags used to create the BO */
+	__u32 flags;
+
+	/** @vpu_addr: Returned VPU virtual address */
+	__u64 vpu_addr;
+
+	/**
+	 * @mmap_offset:
+	 *
+	 * Returned offset to be used in mmap(). 0 in case the BO is not mappable.
+	 */
+	__u64 mmap_offset;
+
+	/** @size: Returned GEM object size, aligned to PAGE_SIZE */
+	__u64 size;
+};
+
 #if defined(__cplusplus)
 }
 #endif