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, 7 insertions, 0 deletions

diff --git a/drivers/accel/ivpu/ivpu_drv.h b/drivers/accel/ivpu/ivpu_drv.h
index d0b006893b1c..b9ce66f40696 100644
--- a/drivers/accel/ivpu/ivpu_drv.h
+++ b/drivers/accel/ivpu/ivpu_drv.h
@@ -15,6 +15,8 @@
 #include <linux/xarray.h>
 #include <uapi/drm/ivpu_accel.h>
 
+#include "ivpu_mmu_context.h"
+
 #define DRIVER_NAME "intel_vpu"
 #define DRIVER_DESC "Driver for Intel Versatile Processing Unit (VPU)"
 #define DRIVER_DATE "20230117"
@@ -71,6 +73,7 @@ struct ivpu_wa_table {
 };
 
 struct ivpu_hw_info;
+struct ivpu_mmu_info;
 
 struct ivpu_device {
 	struct drm_device drm;
@@ -81,7 +84,9 @@ struct ivpu_device {
 
 	struct ivpu_wa_table wa;
 	struct ivpu_hw_info *hw;
+	struct ivpu_mmu_info *mmu;
 
+	struct ivpu_mmu_context gctx;
 	struct xarray context_xa;
 	struct xa_limit context_xa_limit;
 
@@ -100,7 +105,9 @@ struct ivpu_device {
 struct ivpu_file_priv {
 	struct kref ref;
 	struct ivpu_device *vdev;
+	struct ivpu_mmu_context ctx;
 	u32 priority;
+	bool has_mmu_faults;
 };
 
 extern int ivpu_dbg_mask;