Re: [Mesa-dev] [PATCH 1/3] drm-uapi: Pull i915_drm.h changes for context cloning

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Where are these changes from (repo/commit)? It could be good to
reference in the commit message.

I suspect that the answer might mean that these patches should be
labeled RFC.

-Jordan

On 2019-03-25 03:58:58, Chris Wilson wrote:
> For use in GPU recovery and pipeline construction.
> ---
>  include/drm-uapi/i915_drm.h | 389 +++++++++++++++++++++++++++++-------
>  1 file changed, 317 insertions(+), 72 deletions(-)
> 
> diff --git a/include/drm-uapi/i915_drm.h b/include/drm-uapi/i915_drm.h
> index d2792ab3640..59baacd265d 100644
> --- a/include/drm-uapi/i915_drm.h
> +++ b/include/drm-uapi/i915_drm.h
> @@ -62,6 +62,28 @@ extern "C" {
>  #define I915_ERROR_UEVENT              "ERROR"
>  #define I915_RESET_UEVENT              "RESET"
>  
> +/*
> + * i915_user_extension: Base class for defining a chain of extensions
> + *
> + * Many interfaces need to grow over time. In most cases we can simply
> + * extend the struct and have userspace pass in more data. Another option,
> + * as demonstrated by Vulkan's approach to providing extensions for forward
> + * and backward compatibility, is to use a list of optional structs to
> + * provide those extra details.
> + *
> + * The key advantage to using an extension chain is that it allows us to
> + * redefine the interface more easily than an ever growing struct of
> + * increasing complexity, and for large parts of that interface to be
> + * entirely optional. The downside is more pointer chasing; chasing across
> + * the boundary with pointers encapsulated inside u64.
> + */
> +struct i915_user_extension {
> +       __u64 next_extension;
> +       __u32 name;
> +       __u32 flags; /* All undefined bits must be zero. */
> +       __u32 rsvd[4]; /* Reserved for future use; must be zero. */
> +};
> +
>  /*
>   * MOCS indexes used for GPU surfaces, defining the cacheability of the
>   * surface data and the coherency for this data wrt. CPU vs. GPU accesses.
> @@ -99,9 +121,14 @@ enum drm_i915_gem_engine_class {
>         I915_ENGINE_CLASS_VIDEO         = 2,
>         I915_ENGINE_CLASS_VIDEO_ENHANCE = 3,
>  
> +       /* should be kept compact */
> +
>         I915_ENGINE_CLASS_INVALID       = -1
>  };
>  
> +#define I915_ENGINE_CLASS_INVALID_NONE -1
> +#define I915_ENGINE_CLASS_INVALID_VIRTUAL 0
> +
>  /**
>   * DOC: perf_events exposed by i915 through /sys/bus/event_sources/drivers/i915
>   *
> @@ -319,6 +346,9 @@ typedef struct _drm_i915_sarea {
>  #define DRM_I915_PERF_ADD_CONFIG       0x37
>  #define DRM_I915_PERF_REMOVE_CONFIG    0x38
>  #define DRM_I915_QUERY                 0x39
> +#define DRM_I915_GEM_VM_CREATE         0x3a
> +#define DRM_I915_GEM_VM_DESTROY                0x3b
> +/* Must be kept compact -- no holes */
>  
>  #define DRM_IOCTL_I915_INIT            DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
>  #define DRM_IOCTL_I915_FLUSH           DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
> @@ -367,6 +397,7 @@ typedef struct _drm_i915_sarea {
>  #define DRM_IOCTL_I915_GET_SPRITE_COLORKEY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GET_SPRITE_COLORKEY, struct drm_intel_sprite_colorkey)
>  #define DRM_IOCTL_I915_GEM_WAIT                DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_WAIT, struct drm_i915_gem_wait)
>  #define DRM_IOCTL_I915_GEM_CONTEXT_CREATE      DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_CREATE, struct drm_i915_gem_context_create)
> +#define DRM_IOCTL_I915_GEM_CONTEXT_CREATE_EXT  DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_CREATE, struct drm_i915_gem_context_create_ext)
>  #define DRM_IOCTL_I915_GEM_CONTEXT_DESTROY     DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_DESTROY, struct drm_i915_gem_context_destroy)
>  #define DRM_IOCTL_I915_REG_READ                        DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_REG_READ, struct drm_i915_reg_read)
>  #define DRM_IOCTL_I915_GET_RESET_STATS         DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GET_RESET_STATS, struct drm_i915_reset_stats)
> @@ -377,6 +408,8 @@ typedef struct _drm_i915_sarea {
>  #define DRM_IOCTL_I915_PERF_ADD_CONFIG DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_ADD_CONFIG, struct drm_i915_perf_oa_config)
>  #define DRM_IOCTL_I915_PERF_REMOVE_CONFIG      DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_REMOVE_CONFIG, __u64)
>  #define DRM_IOCTL_I915_QUERY                   DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_QUERY, struct drm_i915_query)
> +#define DRM_IOCTL_I915_GEM_VM_CREATE   DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_CREATE, struct drm_i915_gem_vm_control)
> +#define DRM_IOCTL_I915_GEM_VM_DESTROY  DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_VM_DESTROY, struct drm_i915_gem_vm_control)
>  
>  /* Allow drivers to submit batchbuffers directly to hardware, relying
>   * on the security mechanisms provided by hardware.
> @@ -476,6 +509,7 @@ typedef struct drm_i915_irq_wait {
>  #define   I915_SCHEDULER_CAP_ENABLED   (1ul << 0)
>  #define   I915_SCHEDULER_CAP_PRIORITY  (1ul << 1)
>  #define   I915_SCHEDULER_CAP_PREEMPTION        (1ul << 2)
> +#define   I915_SCHEDULER_CAP_SEMAPHORES        (1ul << 3)
>  
>  #define I915_PARAM_HUC_STATUS           42
>  
> @@ -559,6 +593,14 @@ typedef struct drm_i915_irq_wait {
>   */
>  #define I915_PARAM_MMAP_GTT_COHERENT   52
>  
> +/*
> + * Query whether DRM_I915_GEM_EXECBUFFER2 supports coordination of parallel
> + * execution through use of explicit fence support.
> + * See I915_EXEC_FENCE_OUT and I915_EXEC_FENCE_SUBMIT.
> + */
> +#define I915_PARAM_HAS_EXEC_SUBMIT_FENCE 53
> +/* Must be kept compact -- no holes and well documented */
> +
>  typedef struct drm_i915_getparam {
>         __s32 param;
>         /*
> @@ -574,6 +616,7 @@ typedef struct drm_i915_getparam {
>  #define I915_SETPARAM_TEX_LRU_LOG_GRANULARITY             2
>  #define I915_SETPARAM_ALLOW_BATCHBUFFER                   3
>  #define I915_SETPARAM_NUM_USED_FENCES                     4
> +/* Must be kept compact -- no holes */
>  
>  typedef struct drm_i915_setparam {
>         int param;
> @@ -972,7 +1015,7 @@ struct drm_i915_gem_execbuffer2 {
>          * struct drm_i915_gem_exec_fence *fences.
>          */
>         __u64 cliprects_ptr;
> -#define I915_EXEC_RING_MASK              (7<<0)
> +#define I915_EXEC_RING_MASK              (0x3f)
>  #define I915_EXEC_DEFAULT                (0<<0)
>  #define I915_EXEC_RENDER                 (1<<0)
>  #define I915_EXEC_BSD                    (2<<0)
> @@ -1078,7 +1121,16 @@ struct drm_i915_gem_execbuffer2 {
>   */
>  #define I915_EXEC_FENCE_ARRAY   (1<<19)
>  
> -#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_ARRAY<<1))
> +/*
> + * Setting I915_EXEC_FENCE_SUBMIT implies that lower_32_bits(rsvd2) represent
> + * a sync_file fd to wait upon (in a nonblocking manner) prior to executing
> + * the batch.
> + *
> + * Returns -EINVAL if the sync_file fd cannot be found.
> + */
> +#define I915_EXEC_FENCE_SUBMIT         (1 << 20)
> +
> +#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_SUBMIT << 1))
>  
>  #define I915_EXEC_CONTEXT_ID_MASK      (0xffffffff)
>  #define i915_execbuffer2_set_context_id(eb2, context) \
> @@ -1120,32 +1172,34 @@ struct drm_i915_gem_busy {
>          * as busy may become idle before the ioctl is completed.
>          *
>          * Furthermore, if the object is busy, which engine is busy is only
> -        * provided as a guide. There are race conditions which prevent the
> -        * report of which engines are busy from being always accurate.
> -        * However, the converse is not true. If the object is idle, the
> -        * result of the ioctl, that all engines are idle, is accurate.
> +        * provided as a guide and only indirectly by reporting its class
> +        * (there may be more than one engine in each class). There are race
> +        * conditions which prevent the report of which engines are busy from
> +        * being always accurate.  However, the converse is not true. If the
> +        * object is idle, the result of the ioctl, that all engines are idle,
> +        * is accurate.
>          *
>          * The returned dword is split into two fields to indicate both
> -        * the engines on which the object is being read, and the
> -        * engine on which it is currently being written (if any).
> +        * the engine classess on which the object is being read, and the
> +        * engine class on which it is currently being written (if any).
>          *
>          * The low word (bits 0:15) indicate if the object is being written
>          * to by any engine (there can only be one, as the GEM implicit
>          * synchronisation rules force writes to be serialised). Only the
> -        * engine for the last write is reported.
> +        * engine class (offset by 1, I915_ENGINE_CLASS_RENDER is reported as
> +        * 1 not 0 etc) for the last write is reported.
>          *
> -        * The high word (bits 16:31) are a bitmask of which engines are
> -        * currently reading from the object. Multiple engines may be
> +        * The high word (bits 16:31) are a bitmask of which engines classes
> +        * are currently reading from the object. Multiple engines may be
>          * reading from the object simultaneously.
>          *
> -        * The value of each engine is the same as specified in the
> -        * EXECBUFFER2 ioctl, i.e. I915_EXEC_RENDER, I915_EXEC_BSD etc.
> -        * Note I915_EXEC_DEFAULT is a symbolic value and is mapped to
> -        * the I915_EXEC_RENDER engine for execution, and so it is never
> +        * The value of each engine class is the same as specified in the
> +        * I915_CONTEXT_SET_ENGINES parameter and via perf, i.e.
> +        * I915_ENGINE_CLASS_RENDER, I915_ENGINE_CLASS_COPY, etc.
>          * reported as active itself. Some hardware may have parallel
>          * execution engines, e.g. multiple media engines, which are
> -        * mapped to the same identifier in the EXECBUFFER2 ioctl and
> -        * so are not separately reported for busyness.
> +        * mapped to the same class identifier and so are not separately
> +        * reported for busyness.
>          *
>          * Caveat emptor:
>          * Only the boolean result of this query is reliable; that is whether
> @@ -1412,65 +1466,18 @@ struct drm_i915_gem_wait {
>  };
>  
>  struct drm_i915_gem_context_create {
> -       /*  output: id of new context*/
> -       __u32 ctx_id;
> -       __u32 pad;
> -};
> -
> -struct drm_i915_gem_context_destroy {
> -       __u32 ctx_id;
> +       __u32 ctx_id; /* output: id of new context*/
>         __u32 pad;
>  };
>  
> -struct drm_i915_reg_read {
> -       /*
> -        * Register offset.
> -        * For 64bit wide registers where the upper 32bits don't immediately
> -        * follow the lower 32bits, the offset of the lower 32bits must
> -        * be specified
> -        */
> -       __u64 offset;
> -#define I915_REG_READ_8B_WA (1ul << 0)
> -
> -       __u64 val; /* Return value */
> -};
> -/* Known registers:
> - *
> - * Render engine timestamp - 0x2358 + 64bit - gen7+
> - * - Note this register returns an invalid value if using the default
> - *   single instruction 8byte read, in order to workaround that pass
> - *   flag I915_REG_READ_8B_WA in offset field.
> - *
> - */
> -
> -struct drm_i915_reset_stats {
> -       __u32 ctx_id;
> +struct drm_i915_gem_context_create_ext {
> +       __u32 ctx_id; /* output: id of new context*/
>         __u32 flags;
> -
> -       /* All resets since boot/module reload, for all contexts */
> -       __u32 reset_count;
> -
> -       /* Number of batches lost when active in GPU, for this context */
> -       __u32 batch_active;
> -
> -       /* Number of batches lost pending for execution, for this context */
> -       __u32 batch_pending;
> -
> -       __u32 pad;
> -};
> -
> -struct drm_i915_gem_userptr {
> -       __u64 user_ptr;
> -       __u64 user_size;
> -       __u32 flags;
> -#define I915_USERPTR_READ_ONLY 0x1
> -#define I915_USERPTR_UNSYNCHRONIZED 0x80000000
> -       /**
> -        * Returned handle for the object.
> -        *
> -        * Object handles are nonzero.
> -        */
> -       __u32 handle;
> +#define I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS       (1u << 0)
> +#define I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE      (1u << 1)
> +#define I915_CONTEXT_CREATE_FLAGS_UNKNOWN \
> +       (-(I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE << 1))
> +       __u64 extensions;
>  };
>  
>  struct drm_i915_gem_context_param {
> @@ -1491,6 +1498,63 @@ struct drm_i915_gem_context_param {
>          * drm_i915_gem_context_param_sseu.
>          */
>  #define I915_CONTEXT_PARAM_SSEU                0x7
> +
> +/*
> + * Not all clients may want to attempt automatic recover of a context after
> + * a hang (for example, some clients may only submit very small incremental
> + * batches relying on known logical state of previous batches which will never
> + * recover correctly and each attempt will hang), and so would prefer that
> + * the context is forever banned instead.
> + *
> + * If set to false (0), after a reset, subsequent (and in flight) rendering
> + * from this context is discarded, and the client will need to create a new
> + * context to use instead.
> + *
> + * If set to true (1), the kernel will automatically attempt to recover the
> + * context by skipping the hanging batch and executing the next batch starting
> + * from the default context state (discarding the incomplete logical context
> + * state lost due to the reset).
> + *
> + * On creation, all new contexts are marked as recoverable.
> + */
> +#define I915_CONTEXT_PARAM_RECOVERABLE 0x8
> +
> +       /*
> +        * The id of the associated virtual memory address space (ppGTT) of
> +        * this context. Can be retrieved and passed to another context
> +        * (on the same fd) for both to use the same ppGTT and so share
> +        * address layouts, and avoid reloading the page tables on context
> +        * switches between themselves.
> +        *
> +        * See DRM_I915_GEM_VM_CREATE and DRM_I915_GEM_VM_DESTROY.
> +        */
> +#define I915_CONTEXT_PARAM_VM          0x9
> +
> +/*
> + * I915_CONTEXT_PARAM_ENGINES:
> + *
> + * Bind this context to operate on this subset of available engines. Henceforth,
> + * the I915_EXEC_RING selector for DRM_IOCTL_I915_GEM_EXECBUFFER2 operates as
> + * an index into this array of engines; I915_EXEC_DEFAULT selecting engine[0]
> + * and upwards. Slots 0...N are filled in using the specified (class, instance).
> + * Use
> + *     engine_class: I915_ENGINE_CLASS_INVALID,
> + *     engine_instance: I915_ENGINE_CLASS_INVALID_NONE
> + * to specify a gap in the array that can be filled in later, e.g. by a
> + * virtual engine used for load balancing.
> + *
> + * Setting the number of engines bound to the context to 0, by passing a zero
> + * sized argument, will revert back to default settings.
> + *
> + * See struct i915_context_param_engines.
> + *
> + * Extensions:
> + *   i915_context_engines_load_balance (I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE)
> + *   i915_context_engines_bond (I915_CONTEXT_ENGINES_EXT_BOND)
> + */
> +#define I915_CONTEXT_PARAM_ENGINES     0xa
> +/* Must be kept compact -- no holes and well documented */
> +
>         __u64 value;
>  };
>  
> @@ -1553,6 +1617,186 @@ struct drm_i915_gem_context_param_sseu {
>         __u32 rsvd;
>  };
>  
> +/*
> + * i915_context_engines_load_balance:
> + *
> + * Enable load balancing across this set of engines.
> + *
> + * Into the I915_EXEC_DEFAULT slot [0], a virtual engine is created that when
> + * used will proxy the execbuffer request onto one of the set of engines
> + * in such a way as to distribute the load evenly across the set.
> + *
> + * The set of engines must be compatible (e.g. the same HW class) as they
> + * will share the same logical GPU context and ring.
> + *
> + * To intermix rendering with the virtual engine and direct rendering onto
> + * the backing engines (bypassing the load balancing proxy), the context must
> + * be defined to use a single timeline for all engines.
> + */
> +struct i915_context_engines_load_balance {
> +       struct i915_user_extension base;
> +
> +       __u16 engine_index;
> +       __u16 mbz16; /* reserved for future use; must be zero */
> +       __u32 flags; /* all undefined flags must be zero */
> +
> +       __u64 engines_mask; /* selection mask of engines[] */
> +
> +       __u64 mbz64[4]; /* reserved for future use; must be zero */
> +};
> +
> +/*
> + * i915_context_engines_bond:
> + *
> + * Constructed bonded pairs for execution within a virtual engine.
> + *
> + * All engines are equal, but some are more equal than others. Given
> + * the distribution of resources in the HW, it may be preferable to run
> + * a request on a given subset of engines in parallel to a request on a
> + * specific engine. We enable this selection of engines within a virtual
> + * engine by specifying bonding pairs, for any given master engine we will
> + * only execute on one of the corresponding siblings within the virtual engine.
> + *
> + * To execute a request in parallel on the master engine and a sibling requires
> + * coordination with a I915_EXEC_FENCE_SUBMIT.
> + */
> +struct i915_context_engines_bond {
> +       struct i915_user_extension base;
> +
> +       __u16 virtual_index; /* index of virtual engine in ctx->engines[] */
> +       __u16 mbz;
> +
> +       __u16 master_class;
> +       __u16 master_instance;
> +
> +       __u64 sibling_mask; /* bitmask of BIT(sibling_index) wrt the v.engine */
> +       __u64 flags; /* all undefined flags must be zero */
> +};
> +
> +struct i915_context_param_engines {
> +       __u64 extensions; /* linked chain of extension blocks, 0 terminates */
> +#define I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE 0
> +#define I915_CONTEXT_ENGINES_EXT_BOND 1
> +
> +       struct {
> +               __u16 engine_class; /* see enum drm_i915_gem_engine_class */
> +               __u16 engine_instance;
> +       } class_instance[0];
> +} __attribute__((packed));
> +
> +#define I915_DEFINE_CONTEXT_PARAM_ENGINES(name__, N__) struct { \
> +       __u64 extensions; \
> +       struct { \
> +               __u16 engine_class; \
> +               __u16 engine_instance; \
> +       } class_instance[N__]; \
> +} __attribute__((packed)) name__
> +
> +struct drm_i915_gem_context_create_ext_setparam {
> +#define I915_CONTEXT_CREATE_EXT_SETPARAM 0
> +       struct i915_user_extension base;
> +       struct drm_i915_gem_context_param param;
> +};
> +
> +struct drm_i915_gem_context_create_ext_clone {
> +#define I915_CONTEXT_CREATE_EXT_CLONE 1
> +       struct i915_user_extension base;
> +       __u32 clone_id;
> +       __u32 flags;
> +#define I915_CONTEXT_CLONE_ENGINES     (1u << 0)
> +#define I915_CONTEXT_CLONE_FLAGS       (1u << 1)
> +#define I915_CONTEXT_CLONE_SCHEDATTR   (1u << 2)
> +#define I915_CONTEXT_CLONE_SSEU                (1u << 3)
> +#define I915_CONTEXT_CLONE_TIMELINE    (1u << 4)
> +#define I915_CONTEXT_CLONE_VM          (1u << 5)
> +#define I915_CONTEXT_CLONE_UNKNOWN -(I915_CONTEXT_CLONE_VM << 1)
> +       __u64 rsvd;
> +};
> +
> +struct drm_i915_gem_context_destroy {
> +       __u32 ctx_id;
> +       __u32 pad;
> +};
> +
> +/*
> + * DRM_I915_GEM_VM_CREATE -
> + *
> + * Create a new virtual memory address space (ppGTT) for use within a context
> + * on the same file. Extensions can be provided to configure exactly how the
> + * address space is setup upon creation.
> + *
> + * The id of new VM (bound to the fd) for use with I915_CONTEXT_PARAM_VM is
> + * returned in the outparam @id.
> + *
> + * No flags are defined, with all bits reserved and must be zero.
> + *
> + * An extension chain maybe provided, starting with @extensions, and terminated
> + * by the @next_extension being 0. Currently, no extensions are defined.
> + *
> + * DRM_I915_GEM_VM_DESTROY -
> + *
> + * Destroys a previously created VM id, specified in @id.
> + *
> + * No extensions or flags are allowed currently, and so must be zero.
> + */
> +struct drm_i915_gem_vm_control {
> +       __u64 extensions;
> +       __u32 flags;
> +       __u32 vm_id;
> +};
> +
> +struct drm_i915_reg_read {
> +       /*
> +        * Register offset.
> +        * For 64bit wide registers where the upper 32bits don't immediately
> +        * follow the lower 32bits, the offset of the lower 32bits must
> +        * be specified
> +        */
> +       __u64 offset;
> +#define I915_REG_READ_8B_WA (1ul << 0)
> +
> +       __u64 val; /* Return value */
> +};
> +
> +/* Known registers:
> + *
> + * Render engine timestamp - 0x2358 + 64bit - gen7+
> + * - Note this register returns an invalid value if using the default
> + *   single instruction 8byte read, in order to workaround that pass
> + *   flag I915_REG_READ_8B_WA in offset field.
> + *
> + */
> +
> +struct drm_i915_reset_stats {
> +       __u32 ctx_id;
> +       __u32 flags;
> +
> +       /* All resets since boot/module reload, for all contexts */
> +       __u32 reset_count;
> +
> +       /* Number of batches lost when active in GPU, for this context */
> +       __u32 batch_active;
> +
> +       /* Number of batches lost pending for execution, for this context */
> +       __u32 batch_pending;
> +
> +       __u32 pad;
> +};
> +
> +struct drm_i915_gem_userptr {
> +       __u64 user_ptr;
> +       __u64 user_size;
> +       __u32 flags;
> +#define I915_USERPTR_READ_ONLY 0x1
> +#define I915_USERPTR_UNSYNCHRONIZED 0x80000000
> +       /**
> +        * Returned handle for the object.
> +        *
> +        * Object handles are nonzero.
> +        */
> +       __u32 handle;
> +};
> +
>  enum drm_i915_oa_format {
>         I915_OA_FORMAT_A13 = 1,     /* HSW only */
>         I915_OA_FORMAT_A29,         /* HSW only */
> @@ -1714,6 +1958,7 @@ struct drm_i915_perf_oa_config {
>  struct drm_i915_query_item {
>         __u64 query_id;
>  #define DRM_I915_QUERY_TOPOLOGY_INFO    1
> +/* Must be kept compact -- no holes and well documented */
>  
>         /*
>          * When set to zero by userspace, this is filled with the size of the
> -- 
> 2.20.1
> 
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