Commit ace44e13 authored by Chris Wilson's avatar Chris Wilson

drm/i915/gt: Clear CACHE_MODE prior to clearing residuals

Since we do a bare context switch with no restore, the clear residual
kernel runs on dirty state, and we must be careful to avoid executing
with bad state from context registers inherited from a malicious client.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2955
Fixes: 008ead6e ("drm/i915/gt: Restore clear-residual mitigations for Ivybridge, Baytrail")
Fixes: 09aa9e45 ("drm/i915/gt: Restore clear-residual mitigations for Ivybridge, Baytrail")
Testcase: igt/gem_ctx_isolation # ivb,vlv
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Reviewed-by: default avatarAkeem G Abodunrin <akeem.g.abodunrin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210117093015.29143-1-chris@chris-wilson.co.uk
parent f530a41d
......@@ -390,6 +390,16 @@ static void emit_batch(struct i915_vma * const vma,
&cb_kernel_ivb,
desc_count);
/* Reset inherited context registers */
gen7_emit_pipeline_invalidate(&cmds);
batch_add(&cmds, MI_LOAD_REGISTER_IMM(2));
batch_add(&cmds, i915_mmio_reg_offset(CACHE_MODE_0_GEN7));
batch_add(&cmds, 0xffff0000);
batch_add(&cmds, i915_mmio_reg_offset(CACHE_MODE_1));
batch_add(&cmds, 0xffff0000 | PIXEL_SUBSPAN_COLLECT_OPT_DISABLE);
gen7_emit_pipeline_flush(&cmds);
/* Switch to the media pipeline and our base address */
gen7_emit_pipeline_invalidate(&cmds);
batch_add(&cmds, PIPELINE_SELECT | PIPELINE_SELECT_MEDIA);
batch_add(&cmds, MI_NOOP);
......@@ -399,9 +409,11 @@ static void emit_batch(struct i915_vma * const vma,
gen7_emit_state_base_address(&cmds, descriptors);
gen7_emit_pipeline_invalidate(&cmds);
/* Set the clear-residual kernel state */
gen7_emit_vfe_state(&cmds, bv, urb_size - 1, 0, 0);
gen7_emit_interface_descriptor_load(&cmds, descriptors, desc_count);
/* Execute the kernel on all HW threads */
for (i = 0; i < num_primitives(bv); i++)
gen7_emit_media_object(&cmds, i);
......
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