Commit 9bbeaedb authored by Robert Bragg's avatar Robert Bragg Committed by Daniel Vetter

drm/i915: return EACCES for check_cmd() failures

check_cmd() is checking whether a command adheres to certain
restrictions that ensure it's safe to execute within a privileged batch
buffer. Returning false implies a privilege problem, not that the
command is invalid.

The distinction makes the difference between allowing the buffer to be
executed as an unprivileged batch buffer or returning an EINVAL error to
userspace without executing anything.

In a case where userspace may want to test whether it can successfully
write to a register that needs privileges the distinction may be
important and an EINVAL error may be considered fatal.

In particular this is currently true for Mesa, which includes a test for
whether OACONTROL can be written too, but Mesa treats any error when
flushing a batch buffer as fatal, calling exit(1).

As it is currently Mesa can gracefully handle a failure to write to
OACONTROL if the command parser is disabled, but if we were to remove
OACONTROL from the parser's whitelist then the returned EINVAL would
break Mesa applications as they attempt an OACONTROL write.

This bumps the command parser version from 7 to 8, as the change is
visible to userspace.
Signed-off-by: default avatarRobert Bragg <robert@sixbynine.org>
Reviewed-by: default avatarMatthew Auld <matthew.auld@intel.com>
Reviewed-by: default avatarSourab Gupta <sourab.gupta@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161107194957.3385-4-robert@sixbynine.org
parent a941795a
...@@ -1272,7 +1272,7 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine, ...@@ -1272,7 +1272,7 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
if (!check_cmd(engine, desc, cmd, length, is_master, if (!check_cmd(engine, desc, cmd, length, is_master,
&oacontrol_set)) { &oacontrol_set)) {
ret = -EINVAL; ret = -EACCES;
break; break;
} }
...@@ -1333,6 +1333,9 @@ int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv) ...@@ -1333,6 +1333,9 @@ int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv)
* 5. GPGPU dispatch compute indirect registers. * 5. GPGPU dispatch compute indirect registers.
* 6. TIMESTAMP register and Haswell CS GPR registers * 6. TIMESTAMP register and Haswell CS GPR registers
* 7. Allow MI_LOAD_REGISTER_REG between whitelisted registers. * 7. Allow MI_LOAD_REGISTER_REG between whitelisted registers.
* 8. Don't report cmd_check() failures as EINVAL errors to userspace;
* rely on the HW to NOOP disallowed commands as it would without
* the parser enabled.
*/ */
return 7; return 8;
} }
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