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drm/i915: Add support for mandatory cmdparsing
commit 311a50e76a
upstream.
The existing cmdparser for gen7 can be bypassed by specifying
batch_len=0 in the execbuf call. This is safe because bypassing
simply reduces the cmd-set available.
In a later patch we will introduce cmdparsing for gen9, as a
security measure, which must be strictly enforced since without
it we are vulnerable to DoS attacks.
Introduce the concept of 'required' cmd parsing that cannot be
bypassed by submitting zero-length bb's.
v2: rebase (Mika)
v2: rebase (Mika)
v3: fix conflict on engine flags (Mika)
Signed-off-by: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
0b19d8fdfc
commit
397944fc40
3 changed files with 16 additions and 7 deletions
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@ -916,7 +916,7 @@ void intel_engine_init_cmd_parser(struct intel_engine_cs *engine)
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return;
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}
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engine->flags |= I915_ENGINE_NEEDS_CMD_PARSER;
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engine->flags |= I915_ENGINE_USING_CMD_PARSER;
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}
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/**
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@ -928,7 +928,7 @@ void intel_engine_init_cmd_parser(struct intel_engine_cs *engine)
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*/
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void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine)
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{
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if (!intel_engine_needs_cmd_parser(engine))
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if (!intel_engine_using_cmd_parser(engine))
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return;
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fini_hash_table(engine);
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@ -1317,7 +1317,7 @@ int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv)
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/* If the command parser is not enabled, report 0 - unsupported */
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for_each_engine(engine, dev_priv, id) {
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if (intel_engine_needs_cmd_parser(engine)) {
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if (intel_engine_using_cmd_parser(engine)) {
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active = true;
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break;
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}
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@ -270,7 +270,8 @@ static inline u64 gen8_noncanonical_addr(u64 address)
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static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
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{
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return intel_engine_needs_cmd_parser(eb->engine) && eb->batch_len;
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return intel_engine_requires_cmd_parser(eb->engine) ||
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(intel_engine_using_cmd_parser(eb->engine) && eb->batch_len);
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}
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static int eb_create(struct i915_execbuffer *eb)
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@ -417,7 +417,8 @@ struct intel_engine_cs {
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struct intel_engine_hangcheck hangcheck;
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#define I915_ENGINE_NEEDS_CMD_PARSER BIT(0)
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#define I915_ENGINE_USING_CMD_PARSER BIT(0)
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#define I915_ENGINE_REQUIRES_CMD_PARSER BIT(3)
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unsigned int flags;
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/*
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@ -445,9 +446,16 @@ struct intel_engine_cs {
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u32 (*get_cmd_length_mask)(u32 cmd_header);
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};
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static inline bool intel_engine_needs_cmd_parser(struct intel_engine_cs *engine)
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static inline bool
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intel_engine_using_cmd_parser(const struct intel_engine_cs *engine)
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{
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return engine->flags & I915_ENGINE_NEEDS_CMD_PARSER;
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return engine->flags & I915_ENGINE_USING_CMD_PARSER;
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}
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static inline bool
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intel_engine_requires_cmd_parser(const struct intel_engine_cs *engine)
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{
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return engine->flags & I915_ENGINE_REQUIRES_CMD_PARSER;
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}
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static inline unsigned int
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