accel/ivpu: Add Intel VPU MMU support

VPU Memory Management Unit is based on ARM MMU-600.
It allows the creation of multiple virtual address spaces for
the device and map noncontinuous host memory (there is no dedicated
memory on the VPU).

Address space is implemented as a struct ivpu_mmu_context, it has an ID,
drm_mm allocator for VPU addresses and struct ivpu_mmu_pgtable that
holds actual 3-level, 4KB page table.
Context with ID 0 (global context) is created upon driver initialization
and it's mainly used for mapping memory required to execute
the firmware.
Contexts with non-zero IDs are user contexts allocated each time
the devices is open()-ed and they map command buffers and other
workload-related memory.
Workloads executing in a given contexts have access only
to the memory mapped in this context.

This patch is has two main files:
  - ivpu_mmu_context.c handles MMU page tables and memory mapping
  - ivpu_mmu.c implements a driver that programs the MMU device

Co-developed-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Co-developed-by: Krystian Pradzynski <krystian.pradzynski@linux.intel.com>
Signed-off-by: Krystian Pradzynski <krystian.pradzynski@linux.intel.com>
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/20230117092723.60441-3-jacek.lawrynowicz@linux.intel.com

1 files changed, 4 insertions, 0 deletions

diff --git a/include/uapi/drm/ivpu_accel.h b/include/uapi/drm/ivpu_accel.h
index c6a98977eb8e..543347df51a1 100644
--- a/include/uapi/drm/ivpu_accel.h
+++ b/include/uapi/drm/ivpu_accel.h
@@ -38,6 +38,7 @@ extern "C" {
 #define DRM_IVPU_PARAM_NUM_CONTEXTS	    4
 #define DRM_IVPU_PARAM_CONTEXT_BASE_ADDRESS 5
 #define DRM_IVPU_PARAM_CONTEXT_PRIORITY	    6
+#define DRM_IVPU_PARAM_CONTEXT_ID	    7
 
 #define DRM_IVPU_PLATFORM_TYPE_SILICON	    0
 
@@ -78,6 +79,9 @@ struct drm_ivpu_param {
 	 * Value of current context scheduling priority (read-write).
 	 * See DRM_IVPU_CONTEXT_PRIORITY_* for possible values.
 	 *
+	 * %DRM_IVPU_PARAM_CONTEXT_ID:
+	 * Current context ID, always greater than 0 (read-only)
+	 *
 	 */
 	__u32 param;