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

Author: jlawryno

drivers/accel/ivpu/Makefile

@@ -3,6 +3,7 @@
 
 intel_vpu-y := \
 	ivpu_drv.o \
+	ivpu_gem.o \
 	ivpu_hw_mtl.o \
 	ivpu_mmu.o \
 	ivpu_mmu_context.o

drivers/accel/ivpu/ivpu_drv.c

@@ -12,8 +12,10 @@
 #include <drm/drm_file.h>
 #include <drm/drm_gem.h>
 #include <drm/drm_ioctl.h>
+#include <drm/drm_prime.h>
 
 #include "ivpu_drv.h"
+#include "ivpu_gem.h"
 #include "ivpu_hw.h"
 #include "ivpu_mmu.h"
 #include "ivpu_mmu_context.h"
@@ -49,6 +51,24 @@ struct ivpu_file_priv *ivpu_file_priv_get(struct ivpu_file_priv *file_priv)
 	return file_priv;
 }
 
+struct ivpu_file_priv *ivpu_file_priv_get_by_ctx_id(struct ivpu_device *vdev, unsigned long id)
+{
+	struct ivpu_file_priv *file_priv;
+
+	xa_lock_irq(&vdev->context_xa);
+	file_priv = xa_load(&vdev->context_xa, id);
+	/* file_priv may still be in context_xa during file_priv_release() */
+	if (file_priv && !kref_get_unless_zero(&file_priv->ref))
+		file_priv = NULL;
+	xa_unlock_irq(&vdev->context_xa);
+
+	if (file_priv)
+		ivpu_dbg(vdev, KREF, "file_priv get by id: ctx %u refcount %u\n",
+			 file_priv->ctx.id, kref_read(&file_priv->ref));
+
+	return file_priv;
+}
+
 static void file_priv_release(struct kref *ref)
 {
 	struct ivpu_file_priv *file_priv = container_of(ref, struct ivpu_file_priv, ref);
@@ -57,7 +77,7 @@ static void file_priv_release(struct kref *ref)
 	ivpu_dbg(vdev, FILE, "file_priv release: ctx %u\n", file_priv->ctx.id);
 
 	ivpu_mmu_user_context_fini(vdev, &file_priv->ctx);
-	WARN_ON(xa_erase_irq(&vdev->context_xa, file_priv->ctx.id) != file_priv);
+	drm_WARN_ON(&vdev->drm, xa_erase_irq(&vdev->context_xa, file_priv->ctx.id) != file_priv);
 	kfree(file_priv);
 }
 
@@ -66,7 +86,7 @@ void ivpu_file_priv_put(struct ivpu_file_priv **link)
 	struct ivpu_file_priv *file_priv = *link;
 	struct ivpu_device *vdev = file_priv->vdev;
 
-	WARN_ON(!file_priv);
+	drm_WARN_ON(&vdev->drm, !file_priv);
 
 	ivpu_dbg(vdev, KREF, "file_priv put: ctx %u refcount %u\n",
 		 file_priv->ctx.id, kref_read(&file_priv->ref));
@@ -200,6 +220,8 @@ static void ivpu_postclose(struct drm_device *dev, struct drm_file *file)
 static const struct drm_ioctl_desc ivpu_drm_ioctls[] = {
 	DRM_IOCTL_DEF_DRV(IVPU_GET_PARAM, ivpu_get_param_ioctl, 0),
 	DRM_IOCTL_DEF_DRV(IVPU_SET_PARAM, ivpu_set_param_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(IVPU_BO_CREATE, ivpu_bo_create_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(IVPU_BO_INFO, ivpu_bo_info_ioctl, 0),
 };
 
 int ivpu_shutdown(struct ivpu_device *vdev)
@@ -227,6 +249,10 @@ static const struct drm_driver driver = {
 
 	.open = ivpu_open,
 	.postclose = ivpu_postclose,
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.gem_prime_import = ivpu_gem_prime_import,
+	.gem_prime_mmap = drm_gem_prime_mmap,
 
 	.ioctls = ivpu_drm_ioctls,
 	.num_ioctls = ARRAY_SIZE(ivpu_drm_ioctls),

drivers/accel/ivpu/ivpu_drv.h

@@ -115,6 +115,7 @@ extern u8 ivpu_pll_min_ratio;
 extern u8 ivpu_pll_max_ratio;
 
 struct ivpu_file_priv *ivpu_file_priv_get(struct ivpu_file_priv *file_priv);
+struct ivpu_file_priv *ivpu_file_priv_get_by_ctx_id(struct ivpu_device *vdev, unsigned long id);
 void ivpu_file_priv_put(struct ivpu_file_priv **link);
 int ivpu_shutdown(struct ivpu_device *vdev);