[Intel-gfx] [PATCH 1/1] drm/i915: Disable pread/pwrite ioctl's for future platforms (v2)

[Jason Ekstrand]

From: Ashutosh Dixit <ashutosh.dixit at intel.com>

The rationale for this change is roughly as follows:

 1. The functionality can be done entirely in userspace with a
    combination of mmap + memcpy

 2. The only reason anyone in userspace is still using it is because
    someone implemented bo_subdata that way in libdrm ages ago and
    they're all too lazy to write the 5 lines of code to do a map.

 3. This falls cleanly into the category of things which will only get
    more painful with local memory support.

These ioctls aren't used much anymore by "real" userspace drivers.
Vulkan has never used them and neither has the iris GL driver.  The old
i965 GL driver does use PWRITE for glBufferSubData but it only supports
up through Gen11; Gen12 was never enabled in i965.  The compute driver
has never used PREAD/PWRITE.  The only remaining user is the media
driver which uses it exactly twice and they're easily removed [1] so
expecting them to drop it going forward is reasonable.

IGT changes which handle this kernel change have also been submitted [2].

[1] https://github.com/intel/media-driver/pull/1160
[2] https://patchwork.freedesktop.org/series/81384/

v2 (Jason Ekstrand):
 - Improved commit message with the status of all usermode drivers
 - A more future-proof platform check

Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
Signed-off-by: Jason Ekstrand <jason at jlekstrand.net>
---
 drivers/gpu/drm/i915/i915_drv.h |  1 +
 drivers/gpu/drm/i915/i915_gem.c | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1d45d7492d10d..3f74188fa8090 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1633,6 +1633,7 @@ tgl_stepping_get(struct drm_i915_private *dev_priv)
 #define HAS_SECURE_BATCHES(dev_priv) (INTEL_GEN(dev_priv) < 6)
 #define HAS_WT(dev_priv)	HAS_EDRAM(dev_priv)
 
+#define HAS_PREAD_PWRITE(dev_priv)	(!INTEL_INFO(dev_priv)->no_pread_pwrite)
 #define HWS_NEEDS_PHYSICAL(dev_priv)	(INTEL_INFO(dev_priv)->hws_needs_physical)
 
 #define HAS_LOGICAL_RING_CONTEXTS(dev_priv) \
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index b2e3b5cfccb4a..78ad5a9dd4784 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -374,10 +374,19 @@ int
 i915_gem_pread_ioctl(struct drm_device *dev, void *data,
 		     struct drm_file *file)
 {
+	struct drm_i915_private *i915 = to_i915(dev);
 	struct drm_i915_gem_pread *args = data;
 	struct drm_i915_gem_object *obj;
 	int ret;
 
+	/* Pread is disallowed for all platforms after TGL-LP */
+	if (INTEL_GEN(i915) >= 12 && !IS_TIGERLAKE(i915))
+		return -EOPNOTSUPP;
+
+	/* All discrete memory platforms are Gen12 or above */
+	if (WARN_ON(HAS_LMEM(i915)))
+		return -EOPNOTSUPP;
+
 	if (args->size == 0)
 		return 0;
 
@@ -675,10 +684,19 @@ int
 i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
 		      struct drm_file *file)
 {
+	struct drm_i915_private *i915 = to_i915(dev);
 	struct drm_i915_gem_pwrite *args = data;
 	struct drm_i915_gem_object *obj;
 	int ret;
 
+	/* Pwrite is disallowed for all platforms after TGL-LP */
+	if (INTEL_GEN(i915) >= 12 && !IS_TIGERLAKE(i915))
+		return -EOPNOTSUPP;
+
+	/* All discrete memory platforms are Gen12 or above */
+	if (WARN_ON(HAS_LMEM(i915)))
+		return -EOPNOTSUPP;
+
 	if (args->size == 0)
 		return 0;
 
-- 
2.29.2