From: Pallavi Mishra <pallavi.mishra@xxxxxxxxx>
It's a noop on all new platforms starting from MTL.
Refer: (e7737b67ab46) drm/i915/uapi: reject caching ioctls for discrete
v2:
1. block get caching ioctl
2. return ENODEV similar to DGFX
3. update the doc in i915_drm.h
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Signed-off-by: Pallavi Mishra <pallavi.mishra@xxxxxxxxx>
Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_domain.c | 4 ++--
include/uapi/drm/i915_drm.h | 3 +++
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
index d44a152ce680..cf817ee0aa01 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
@@ -291,7 +291,7 @@ int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
struct drm_i915_gem_object *obj;
int err = 0;
- if (IS_DGFX(to_i915(dev)))
+ if (IS_DGFX(to_i915(dev)) || GRAPHICS_VER_FULL(to_i915(dev)) >= IP_VER(12, 70))
return -ENODEV;
rcu_read_lock();
@@ -329,7 +329,7 @@ int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
enum i915_cache_level level;
int ret = 0;
- if (IS_DGFX(i915))
+ if (IS_DGFX(i915) || GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
return -ENODEV;
switch (args->caching) {
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 8df261c5ab9b..3467fd879427 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1626,6 +1626,9 @@ struct drm_i915_gem_busy {
* - Everything else is always allocated and mapped as write-back, with the
* guarantee that everything is also coherent with the GPU.
*
+ * Starting from MTL even on integrated platforms set/get caching is no longer
+ * supported and object will be mapped as write-combined only.
+ *
* Note that this is likely to change in the future again, where we might need
* more flexibility on future devices, so making this all explicit as part of a
* new &drm_i915_gem_create_ext extension is probable.
--
2.25.1
