accel/ivpu: Remove support for uncached buffers

Usages of DRM_IVPU_BO_UNCACHED should be replaced by DRM_IVPU_BO_WC.
There is no functional benefit from DRM_IVPU_BO_UNCACHED if these
buffers are never mapped to host VM.

This allows to cut the buffer handling code in the kernel driver
by half.

Usage of DRM_IVPU_BO_UNCACHED buffers was removed from user-space
driver and will not be part of first UMD release.
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231031073156.1301669-4-stanislaw.gruszka@linux.intel.com

drivers/accel/ivpu/ivpu_fw.c

@@ -286,7 +286,7 @@ static int ivpu_fw_mem_init(struct ivpu_device *vdev)
 
 	if (fw->shave_nn_size) {
 		fw->mem_shave_nn = ivpu_bo_alloc_internal(vdev, vdev->hw->ranges.shave.start,
-							  fw->shave_nn_size, DRM_IVPU_BO_UNCACHED);
+							  fw->shave_nn_size, DRM_IVPU_BO_WC);
 		if (!fw->mem_shave_nn) {
 			ivpu_err(vdev, "Failed to allocate shavenn buffer\n");
 			ret = -ENOMEM;

drivers/accel/ivpu/ivpu_gem.c

@@ -89,8 +89,6 @@ static int __must_check shmem_alloc_pages_locked(struct ivpu_bo *bo)
 
 	if (bo->flags & DRM_IVPU_BO_WC)
 		set_pages_array_wc(pages, npages);
-	else if (bo->flags & DRM_IVPU_BO_UNCACHED)
-		set_pages_array_uc(pages, npages);
 
 	bo->pages = pages;
 	return 0;
@@ -366,7 +364,6 @@ ivpu_bo_alloc(struct ivpu_device *vdev, u64 size, u32 flags, const struct ivpu_b
 
 	switch (flags & DRM_IVPU_BO_CACHE_MASK) {
 	case DRM_IVPU_BO_CACHED:
-	case DRM_IVPU_BO_UNCACHED:
 	case DRM_IVPU_BO_WC:
 		break;
 	default:

include/uapi/drm/ivpu_accel.h

@@ -196,7 +196,7 @@ struct drm_ivpu_bo_create {
 	 *
 	 * %DRM_IVPU_BO_UNCACHED:
 	 *
-	 * Allocated BO will not be cached on host side nor snooped on the VPU side.
+	 * Not supported. Use DRM_IVPU_BO_WC instead.
 	 *
 	 * %DRM_IVPU_BO_WC:
 	 *