[Intel-gfx] [PATCH v5 13/63] drm/i915: Reject more ioctls for userptr

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Subject: [Intel-gfx] [PATCH v5 13/63] drm/i915: Reject more ioctls for userptr
Date: Wed, 25 Nov 2020 11:39:21 +0100	[thread overview]
Message-ID: <20201125104011.606641-14-maarten.lankhorst@linux.intel.com> (raw)
In-Reply-To: <20201125104011.606641-1-maarten.lankhorst@linux.intel.com>

There are a couple of ioctl's related to tiling and cache placement,
that make no sense for userptr, reject those:
- i915_gem_set_tiling_ioctl()
    Tiling should always be linear for userptr. Changing placement will
    fail with -ENXIO.
- i915_gem_set_caching_ioctl()
    Userptr memory should always be cached. Changing will fail with
    -ENXIO.
- i915_gem_set_domain_ioctl()
    Changed to be equivalent to gem_wait, which is correct for the
    cached linear userptr pointers. This is required because we
    cannot grab a reference to the pages in the rework, but waiting
    for idle will do the same.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

-- Still needs an ack from relevant userspace that it won't break, but should be good.
---
 drivers/gpu/drm/i915/display/intel_display.c | 2 +-
 drivers/gpu/drm/i915/gem/i915_gem_domain.c   | 4 +++-
 drivers/gpu/drm/i915/gem/i915_gem_object.h   | 6 ++++++
 drivers/gpu/drm/i915/gem/i915_gem_userptr.c  | 3 ++-
 4 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 595183f7b60f..422cea954462 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -17854,7 +17854,7 @@ static int intel_user_framebuffer_create_handle(struct drm_framebuffer *fb,
 	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 
-	if (obj->userptr.mm) {
+	if (i915_gem_object_is_userptr(obj)) {
 		drm_dbg(&i915->drm,
 			"attempting to use a userptr for a framebuffer, denied\n");
 		return -EINVAL;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
index fcce6909f201..c1d4bf62b3ea 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
@@ -528,7 +528,9 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
 	 * considered to be outside of any cache domain.
 	 */
 	if (i915_gem_object_is_proxy(obj)) {
-		err = -ENXIO;
+		/* silently allow userptr to complete */
+		if (!i915_gem_object_is_userptr(obj))
+			err = -ENXIO;
 		goto out;
 	}
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index fa699d45e5a9..2ba6d114182c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -534,6 +534,12 @@ void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 					      enum fb_op_origin origin);
 
+static inline bool
+i915_gem_object_is_userptr(struct drm_i915_gem_object *obj)
+{
+	return obj->userptr.mm;
+}
+
 static inline void
 i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 				  enum fb_op_origin origin)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 44af6265948d..64a946d5f753 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -721,7 +721,8 @@ static const struct drm_i915_gem_object_ops i915_gem_userptr_ops = {
 	.name = "i915_gem_object_userptr",
 	.flags = I915_GEM_OBJECT_IS_SHRINKABLE |
 		 I915_GEM_OBJECT_NO_MMAP |
-		 I915_GEM_OBJECT_ASYNC_CANCEL,
+		 I915_GEM_OBJECT_ASYNC_CANCEL |
+		 I915_GEM_OBJECT_IS_PROXY,
 	.get_pages = i915_gem_userptr_get_pages,
 	.put_pages = i915_gem_userptr_put_pages,
 	.dmabuf_export = i915_gem_userptr_dmabuf_export,
-- 
2.29.2.222.g5d2a92d10f8

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