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drm/i915: Add support for mandatory cmdparsing 

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: Tony Luck <tony.luck@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris.p.wilson@intel.com>
This commit is contained in:
Jon Bloomfield 2018-08-01 09:33:59 -07:00
parent 66d8aba1cd
commit 311a50e76a
3 changed files with 15 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -296,7 +296,8 @@ static inline u64 gen8_noncanonical_addr(u64 address)
static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
{
return intel_engine_needs_cmd_parser(eb->engine) && eb->batch_len;
return intel_engine_requires_cmd_parser(eb->engine) ||
(intel_engine_using_cmd_parser(eb->engine) && eb->batch_len);
}
static int eb_create(struct i915_execbuffer *eb)

13
drivers/gpu/drm/i915/gt/intel_engine_types.h
View File

@ -475,12 +475,13 @@ struct intel_engine_cs {
struct intel_engine_hangcheck hangcheck;
#define I915_ENGINE_NEEDS_CMD_PARSER BIT(0)
#define I915_ENGINE_USING_CMD_PARSER BIT(0)
#define I915_ENGINE_SUPPORTS_STATS BIT(1)
#define I915_ENGINE_HAS_PREEMPTION BIT(2)
#define I915_ENGINE_HAS_SEMAPHORES BIT(3)
#define I915_ENGINE_NEEDS_BREADCRUMB_TASKLET BIT(4)
#define I915_ENGINE_IS_VIRTUAL BIT(5)
#define I915_ENGINE_REQUIRES_CMD_PARSER BIT(7)
unsigned int flags;
/*
@ -541,9 +542,15 @@ struct intel_engine_cs {
};
static inline bool
intel_engine_needs_cmd_parser(const struct intel_engine_cs *engine)
intel_engine_using_cmd_parser(const struct intel_engine_cs *engine)
{
return engine->flags & I915_ENGINE_NEEDS_CMD_PARSER;
return engine->flags & I915_ENGINE_USING_CMD_PARSER;
}
static inline bool
intel_engine_requires_cmd_parser(const struct intel_engine_cs *engine)
{
return engine->flags & I915_ENGINE_REQUIRES_CMD_PARSER;
}
static inline bool

6
drivers/gpu/drm/i915/i915_cmd_parser.c
View File

@ -918,7 +918,7 @@ void intel_engine_init_cmd_parser(struct intel_engine_cs *engine)
return;
}
engine->flags |= I915_ENGINE_NEEDS_CMD_PARSER;
engine->flags |= I915_ENGINE_USING_CMD_PARSER;
}
/**
@ -930,7 +930,7 @@ void intel_engine_init_cmd_parser(struct intel_engine_cs *engine)
*/
void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine)
{
if (!intel_engine_needs_cmd_parser(engine))
if (!intel_engine_using_cmd_parser(engine))
return;
fini_hash_table(engine);
@ -1317,7 +1317,7 @@ int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv)
/* If the command parser is not enabled, report 0 - unsupported */
for_each_uabi_engine(engine, dev_priv) {
if (intel_engine_needs_cmd_parser(engine)) {
if (intel_engine_using_cmd_parser(engine)) {
active = true;
break;
}