[PATCH 16/16] drm/i915/vm_bind: Add uapi for user to enable vm_bind_mode

[Niranjana Vishwanathapura]

Add getparam support for VM_BIND capability version.
Add VM creation time flag to enable vm_bind_mode for the VM.

Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c |  9 +++++++-
 drivers/gpu/drm/i915/i915_drv.h             |  2 ++
 drivers/gpu/drm/i915/i915_getparam.c        |  3 +++
 include/uapi/drm/i915_drm.h                 | 24 ++++++++++++++++++++-
 4 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index f4e648ec01ed..c20bd6e8aaf8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -1808,9 +1808,13 @@ int i915_gem_vm_create_ioctl(struct drm_device *dev, void *data,
 	if (!HAS_FULL_PPGTT(i915))
 		return -ENODEV;
 
-	if (args->flags)
+	if (args->flags & I915_VM_CREATE_FLAGS_UNKNOWN)
 		return -EINVAL;
 
+	if ((args->flags & I915_VM_CREATE_FLAGS_USE_VM_BIND) &&
+	    !HAS_VM_BIND(i915))
+		return -EOPNOTSUPP;
+
 	ppgtt = i915_ppgtt_create(to_gt(i915), 0);
 	if (IS_ERR(ppgtt))
 		return PTR_ERR(ppgtt);
@@ -1828,6 +1832,9 @@ int i915_gem_vm_create_ioctl(struct drm_device *dev, void *data,
 	if (err)
 		goto err_put;
 
+	if (args->flags & I915_VM_CREATE_FLAGS_USE_VM_BIND)
+		ppgtt->vm.vm_bind_mode = true;
+
 	GEM_BUG_ON(id == 0); /* reserved for invalid/unassigned ppgtt */
 	args->vm_id = id;
 	return 0;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 84a2f6b16f57..e77393d74c6f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -974,6 +974,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 
 #define HAS_ONE_EU_PER_FUSE_BIT(i915)	(INTEL_INFO(i915)->has_one_eu_per_fuse_bit)
 
+#define HAS_VM_BIND(dev_priv) (GRAPHICS_VER(dev_priv) >= 12)
+
 /* intel_device_info.c */
 static inline struct intel_device_info *
 mkwrite_device_info(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/i915_getparam.c b/drivers/gpu/drm/i915/i915_getparam.c
index 342c8ca6414e..f45b3c684bcf 100644
--- a/drivers/gpu/drm/i915/i915_getparam.c
+++ b/drivers/gpu/drm/i915/i915_getparam.c
@@ -175,6 +175,9 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data,
 	case I915_PARAM_PERF_REVISION:
 		value = i915_perf_ioctl_version();
 		break;
+	case I915_PARAM_VM_BIND_VERSION:
+		value = HAS_VM_BIND(i915);
+		break;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", param->param);
 		return -EINVAL;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index f3a5b198b3e7..9a033acc254b 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -755,6 +755,27 @@ typedef struct drm_i915_irq_wait {
 /* Query if the kernel supports the I915_USERPTR_PROBE flag. */
 #define I915_PARAM_HAS_USERPTR_PROBE 56
 
+/*
+ * VM_BIND feature version supported.
+ *
+ * The following versions of VM_BIND have been defined:
+ *
+ * 0: No VM_BIND support.
+ *
+ * 1: In VM_UNBIND calls, the UMD must specify the exact mappings created
+ *    previously with VM_BIND, the ioctl will not support unbinding multiple
+ *    mappings or splitting them. Similarly, VM_BIND calls will not replace
+ *    any existing mappings.
+ *
+ * 2: The restrictions on unbinding partial or multiple mappings is
+ *    lifted, Similarly, binding will replace any mappings in the given range.
+ *
+ * See struct drm_i915_gem_vm_bind and struct drm_i915_gem_vm_unbind.
+ *
+ * vm_bind versions are backward compatible.
+ */
+#define I915_PARAM_VM_BIND_VERSION	57
+
 /* Must be kept compact -- no holes and well documented */
 
 /**
@@ -2622,7 +2643,8 @@ struct drm_i915_gem_vm_control {
 	/** @extensions: Zero-terminated chain of extensions. */
 	__u64 extensions;
 
-	/** @flags: reserved for future usage, currently MBZ */
+#define I915_VM_CREATE_FLAGS_USE_VM_BIND	(1u << 0)
+#define I915_VM_CREATE_FLAGS_UNKNOWN	(-(I915_VM_CREATE_FLAGS_USE_VM_BIND << 1))
 	__u32 flags;
 
 	/** @vm_id: Id of the VM created or to be destroyed */
-- 
2.21.0.rc0.32.g243a4c7e27