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Release 4.8 drivers/gpu/drm/i915/intel_ringbuffer.h

#ifndef _INTEL_RINGBUFFER_H_

#define _INTEL_RINGBUFFER_H_

#include <linux/hashtable.h>
#include "i915_gem_batch_pool.h"


#define I915_CMD_HASH_ORDER 9

/* Early gen2 devices have a cacheline of just 32 bytes, using 64 is overkill,
 * but keeps the logic simple. Indeed, the whole purpose of this macro is just
 * to give some inclination as to some of the magic values used in the various
 * workarounds!
 */

#define CACHELINE_BYTES 64

#define CACHELINE_DWORDS (CACHELINE_BYTES / sizeof(uint32_t))

/*
 * Gen2 BSpec "1. Programming Environment" / 1.4.4.6 "Ring Buffer Use"
 * Gen3 BSpec "vol1c Memory Interface Functions" / 2.3.4.5 "Ring Buffer Use"
 * Gen4+ BSpec "vol1c Memory Interface and Command Stream" / 5.3.4.5 "Ring Buffer Use"
 *
 * "If the Ring Buffer Head Pointer and the Tail Pointer are on the same
 * cacheline, the Head Pointer must not be greater than the Tail
 * Pointer."
 */

#define I915_RING_FREE_SPACE 64


struct  intel_hw_status_page {
	
u32		*page_addr;
	
unsigned int	gfx_addr;
	
struct		drm_i915_gem_object *obj;
};


#define I915_READ_TAIL(ring) I915_READ(RING_TAIL((ring)->mmio_base))

#define I915_WRITE_TAIL(ring, val) I915_WRITE(RING_TAIL((ring)->mmio_base), val)


#define I915_READ_START(ring) I915_READ(RING_START((ring)->mmio_base))

#define I915_WRITE_START(ring, val) I915_WRITE(RING_START((ring)->mmio_base), val)


#define I915_READ_HEAD(ring)  I915_READ(RING_HEAD((ring)->mmio_base))

#define I915_WRITE_HEAD(ring, val) I915_WRITE(RING_HEAD((ring)->mmio_base), val)


#define I915_READ_CTL(ring) I915_READ(RING_CTL((ring)->mmio_base))

#define I915_WRITE_CTL(ring, val) I915_WRITE(RING_CTL((ring)->mmio_base), val)


#define I915_READ_IMR(ring) I915_READ(RING_IMR((ring)->mmio_base))

#define I915_WRITE_IMR(ring, val) I915_WRITE(RING_IMR((ring)->mmio_base), val)


#define I915_READ_MODE(ring) I915_READ(RING_MI_MODE((ring)->mmio_base))

#define I915_WRITE_MODE(ring, val) I915_WRITE(RING_MI_MODE((ring)->mmio_base), val)

/* seqno size is actually only a uint32, but since we plan to use MI_FLUSH_DW to
 * do the writes, and that must have qw aligned offsets, simply pretend it's 8b.
 */

#define gen8_semaphore_seqno_size sizeof(uint64_t)

#define GEN8_SEMAPHORE_OFFSET(__from, __to)			     \
	(((__from) * I915_NUM_ENGINES  + (__to)) * gen8_semaphore_seqno_size)

#define GEN8_SIGNAL_OFFSET(__ring, to)			     \
	(i915_gem_obj_ggtt_offset(dev_priv->semaphore_obj) + \
         GEN8_SEMAPHORE_OFFSET((__ring)->id, (to)))

#define GEN8_WAIT_OFFSET(__ring, from)			     \
	(i915_gem_obj_ggtt_offset(dev_priv->semaphore_obj) + \
         GEN8_SEMAPHORE_OFFSET(from, (__ring)->id))


enum intel_ring_hangcheck_action {
	
HANGCHECK_IDLE = 0,
	
HANGCHECK_WAIT,
	
HANGCHECK_ACTIVE,
	
HANGCHECK_KICK,
	
HANGCHECK_HUNG,
};


#define HANGCHECK_SCORE_RING_HUNG 31


struct intel_ring_hangcheck {
	
u64 acthd;
	
unsigned long user_interrupts;
	
u32 seqno;
	
int score;
	
enum intel_ring_hangcheck_action action;
	
int deadlock;
	
u32 instdone[I915_NUM_INSTDONE_REG];
};


struct intel_ringbuffer {
	
struct drm_i915_gem_object *obj;
	
void __iomem *virtual_start;
	
struct i915_vma *vma;

	
struct intel_engine_cs *engine;
	
struct list_head link;

	
u32 head;
	
u32 tail;
	
int space;
	
int size;
	
int effective_size;

	/** We track the position of the requests in the ring buffer, and
         * when each is retired we increment last_retired_head as the GPU
         * must have finished processing the request and so we know we
         * can advance the ringbuffer up to that position.
         *
         * last_retired_head is set to -1 after the value is consumed so
         * we can detect new retirements.
         */
	
u32 last_retired_head;
};

struct i915_gem_context;
struct drm_i915_reg_table;

/*
 * we use a single page to load ctx workarounds so all of these
 * values are referred in terms of dwords
 *
 * struct i915_wa_ctx_bb:
 *  offset: specifies batch starting position, also helpful in case
 *    if we want to have multiple batches at different offsets based on
 *    some criteria. It is not a requirement at the moment but provides
 *    an option for future use.
 *  size: size of the batch in DWORDS
 */

struct  i915_ctx_workarounds {
	
struct i915_wa_ctx_bb {
		
u32 offset;
		
u32 size;
	} 

indirect_ctx, per_ctx;
	
struct drm_i915_gem_object *obj;
};

struct drm_i915_gem_request;


struct intel_engine_cs {
	
struct drm_i915_private *i915;
	
const char	*name;
	
enum intel_engine_id {
		
RCS = 0,
		
BCS,
		
VCS,
		
VCS2,	/* Keep instances of the same type engine together. */
		
VECS
	} 
id;

#define I915_NUM_ENGINES 5

#define _VCS(n) (VCS + (n))
	
unsigned int exec_id;
	
unsigned int hw_id;
	
unsigned int guc_id; /* XXX same as hw_id? */
	
u32		mmio_base;
	
struct intel_ringbuffer *buffer;
	
struct list_head buffers;

	/* Rather than have every client wait upon all user interrupts,
         * with the herd waking after every interrupt and each doing the
         * heavyweight seqno dance, we delegate the task (of being the
         * bottom-half of the user interrupt) to the first client. After
         * every interrupt, we wake up one client, who does the heavyweight
         * coherent seqno read and either goes back to sleep (if incomplete),
         * or wakes up all the completed clients in parallel, before then
         * transferring the bottom-half status to the next client in the queue.
         *
         * Compared to walking the entire list of waiters in a single dedicated
         * bottom-half, we reduce the latency of the first waiter by avoiding
         * a context switch, but incur additional coherent seqno reads when
         * following the chain of request breadcrumbs. Since it is most likely
         * that we have a single client waiting on each seqno, then reducing
         * the overhead of waking that client is much preferred.
         */
	
struct intel_breadcrumbs {
		
struct task_struct *irq_seqno_bh; /* bh for user interrupts */
		
unsigned long irq_wakeups;
		
bool irq_posted;

		
spinlock_t lock; /* protects the lists of requests */
		
struct rb_root waiters; /* sorted by retirement, priority */
		
struct rb_root signals; /* sorted by retirement */
		
struct intel_wait *first_wait; /* oldest waiter by retirement */
		
struct task_struct *signaler; /* used for fence signalling */
		
struct drm_i915_gem_request *first_signal;
		
struct timer_list fake_irq; /* used after a missed interrupt */

		
bool irq_enabled : 1;
		
bool rpm_wakelock : 1;
	} 
breadcrumbs;

	/*
         * A pool of objects to use as shadow copies of client batch buffers
         * when the command parser is enabled. Prevents the client from
         * modifying the batch contents after software parsing.
         */
	
struct i915_gem_batch_pool batch_pool;

	
struct intel_hw_status_page status_page;
	
struct i915_ctx_workarounds wa_ctx;

	
u32             irq_keep_mask; /* always keep these interrupts */
	
u32		irq_enable_mask; /* bitmask to enable ring interrupt */
	
void		(*irq_enable)(struct intel_engine_cs *ring);
	
void		(*irq_disable)(struct intel_engine_cs *ring);

	
int		(*init_hw)(struct intel_engine_cs *ring);

	
int		(*init_context)(struct drm_i915_gem_request *req);

	
void		(*write_tail)(struct intel_engine_cs *ring,
				      u32 value);
	
int __must_check (*flush)(struct drm_i915_gem_request *req,
				  u32	invalidate_domains,
				  u32	flush_domains);
	
int		(*add_request)(struct drm_i915_gem_request *req);
	/* Some chipsets are not quite as coherent as advertised and need
         * an expensive kick to force a true read of the up-to-date seqno.
         * However, the up-to-date seqno is not always required and the last
         * seen value is good enough. Note that the seqno will always be
         * monotonic, even if not coherent.
         */
	
void		(*irq_seqno_barrier)(struct intel_engine_cs *ring);
	
int		(*dispatch_execbuffer)(struct drm_i915_gem_request *req,
					       u64 offset, u32 length,
					       unsigned dispatch_flags);

#define I915_DISPATCH_SECURE 0x1

#define I915_DISPATCH_PINNED 0x2

#define I915_DISPATCH_RS     0x4
	
void		(*cleanup)(struct intel_engine_cs *ring);

	/* GEN8 signal/wait table - never trust comments!
         *        signal to     signal to    signal to   signal to      signal to
         *          RCS            VCS          BCS        VECS          VCS2
         *      --------------------------------------------------------------------
         *  RCS | NOP (0x00) | VCS (0x08) | BCS (0x10) | VECS (0x18) | VCS2 (0x20) |
         *      |-------------------------------------------------------------------
         *  VCS | RCS (0x28) | NOP (0x30) | BCS (0x38) | VECS (0x40) | VCS2 (0x48) |
         *      |-------------------------------------------------------------------
         *  BCS | RCS (0x50) | VCS (0x58) | NOP (0x60) | VECS (0x68) | VCS2 (0x70) |
         *      |-------------------------------------------------------------------
         * VECS | RCS (0x78) | VCS (0x80) | BCS (0x88) |  NOP (0x90) | VCS2 (0x98) |
         *      |-------------------------------------------------------------------
         * VCS2 | RCS (0xa0) | VCS (0xa8) | BCS (0xb0) | VECS (0xb8) | NOP  (0xc0) |
         *      |-------------------------------------------------------------------
         *
         * Generalization:
         *  f(x, y) := (x->id * NUM_RINGS * seqno_size) + (seqno_size * y->id)
         *  ie. transpose of g(x, y)
         *
         *       sync from      sync from    sync from    sync from     sync from
         *          RCS            VCS          BCS        VECS          VCS2
         *      --------------------------------------------------------------------
         *  RCS | NOP (0x00) | VCS (0x28) | BCS (0x50) | VECS (0x78) | VCS2 (0xa0) |
         *      |-------------------------------------------------------------------
         *  VCS | RCS (0x08) | NOP (0x30) | BCS (0x58) | VECS (0x80) | VCS2 (0xa8) |
         *      |-------------------------------------------------------------------
         *  BCS | RCS (0x10) | VCS (0x38) | NOP (0x60) | VECS (0x88) | VCS2 (0xb0) |
         *      |-------------------------------------------------------------------
         * VECS | RCS (0x18) | VCS (0x40) | BCS (0x68) |  NOP (0x90) | VCS2 (0xb8) |
         *      |-------------------------------------------------------------------
         * VCS2 | RCS (0x20) | VCS (0x48) | BCS (0x70) | VECS (0x98) |  NOP (0xc0) |
         *      |-------------------------------------------------------------------
         *
         * Generalization:
         *  g(x, y) := (y->id * NUM_RINGS * seqno_size) + (seqno_size * x->id)
         *  ie. transpose of f(x, y)
         */
	struct {
		
u32	sync_seqno[I915_NUM_ENGINES-1];

		union {
			struct {
				/* our mbox written by others */
				
u32		wait[I915_NUM_ENGINES];
				/* mboxes this ring signals to */
				
i915_reg_t	signal[I915_NUM_ENGINES];
			} 
mbox;
			
u64		signal_ggtt[I915_NUM_ENGINES];
		};

		/* AKA wait() */
		
int	(*sync_to)(struct drm_i915_gem_request *to_req,
				   struct intel_engine_cs *from,
				   u32 seqno);
		
int	(*signal)(struct drm_i915_gem_request *signaller_req,
				  /* num_dwords needed by caller */
				  unsigned int num_dwords);
	} 
semaphore;

	/* Execlists */
	
struct tasklet_struct irq_tasklet;
	
spinlock_t execlist_lock; /* used inside tasklet, use spin_lock_bh */
	
struct list_head execlist_queue;
	
unsigned int fw_domains;
	
unsigned int next_context_status_buffer;
	
unsigned int idle_lite_restore_wa;
	
bool disable_lite_restore_wa;
	
u32 ctx_desc_template;
	
int		(*emit_request)(struct drm_i915_gem_request *request);
	
int		(*emit_flush)(struct drm_i915_gem_request *request,
				      u32 invalidate_domains,
				      u32 flush_domains);
	
int		(*emit_bb_start)(struct drm_i915_gem_request *req,
					 u64 offset, unsigned dispatch_flags);

	/**
         * List of objects currently involved in rendering from the
         * ringbuffer.
         *
         * Includes buffers having the contents of their GPU caches
         * flushed, not necessarily primitives.  last_read_req
         * represents when the rendering involved will be completed.
         *
         * A reference is held on the buffer while on this list.
         */
	
struct list_head active_list;

	/**
         * List of breadcrumbs associated with GPU requests currently
         * outstanding.
         */
	
struct list_head request_list;

	/**
         * Seqno of request most recently submitted to request_list.
         * Used exclusively by hang checker to avoid grabbing lock while
         * inspecting request list.
         */
	
u32 last_submitted_seqno;

	
bool gpu_caches_dirty;

	
struct i915_gem_context *last_context;

	
struct intel_ring_hangcheck hangcheck;

	struct {
		
struct drm_i915_gem_object *obj;
		
u32 gtt_offset;
	} 
scratch;

	
bool needs_cmd_parser;

	/*
         * Table of commands the command parser needs to know about
         * for this ring.
         */
	DECLARE_HASHTABLE(cmd_hash, I915_CMD_HASH_ORDER);

	/*
         * Table of registers allowed in commands that read/write registers.
         */
	
const struct drm_i915_reg_table *reg_tables;
	
int reg_table_count;

	/*
         * Returns the bitmask for the length field of the specified command.
         * Return 0 for an unrecognized/invalid command.
         *
         * If the command parser finds an entry for a command in the ring's
         * cmd_tables, it gets the command's length based on the table entry.
         * If not, it calls this function to determine the per-ring length field
         * encoding for the command (i.e. certain opcode ranges use certain bits
         * to encode the command length in the header).
         */
	
u32 (*get_cmd_length_mask)(u32 cmd_header);
};


static inline bool intel_engine_initialized(const struct intel_engine_cs *engine) { return engine->i915 != NULL; }

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static inline unsigned intel_engine_flag(const struct intel_engine_cs *engine) { return 1 << engine->id; }

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static inline u32 intel_ring_sync_index(struct intel_engine_cs *engine, struct intel_engine_cs *other) { int idx; /* * rcs -> 0 = vcs, 1 = bcs, 2 = vecs, 3 = vcs2; * vcs -> 0 = bcs, 1 = vecs, 2 = vcs2, 3 = rcs; * bcs -> 0 = vecs, 1 = vcs2. 2 = rcs, 3 = vcs; * vecs -> 0 = vcs2, 1 = rcs, 2 = vcs, 3 = bcs; * vcs2 -> 0 = rcs, 1 = vcs, 2 = bcs, 3 = vecs; */ idx = (other - engine) - 1; if (idx < 0) idx += I915_NUM_ENGINES; return idx; }

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static inline void intel_flush_status_page(struct intel_engine_cs *engine, int reg) { mb(); clflush(&engine->status_page.page_addr[reg]); mb(); }

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static inline u32 intel_read_status_page(struct intel_engine_cs *engine, int reg) { /* Ensure that the compiler doesn't optimize away the load. */ return READ_ONCE(engine->status_page.page_addr[reg]); }

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static inline void intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value) { engine->status_page.page_addr[reg] = value; }

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/* * Reads a dword out of the status page, which is written to from the command * queue by automatic updates, MI_REPORT_HEAD, MI_STORE_DATA_INDEX, or * MI_STORE_DATA_IMM. * * The following dwords have a reserved meaning: * 0x00: ISR copy, updated when an ISR bit not set in the HWSTAM changes. * 0x04: ring 0 head pointer * 0x05: ring 1 head pointer (915-class) * 0x06: ring 2 head pointer (915-class) * 0x10-0x1b: Context status DWords (GM45) * 0x1f: Last written status offset. (GM45) * 0x20-0x2f: Reserved (Gen6+) * * The area from dword 0x30 to 0x3ff is available for driver usage. */ #define I915_GEM_HWS_INDEX 0x30 #define I915_GEM_HWS_INDEX_ADDR (I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT) #define I915_GEM_HWS_SCRATCH_INDEX 0x40 #define I915_GEM_HWS_SCRATCH_ADDR (I915_GEM_HWS_SCRATCH_INDEX << MI_STORE_DWORD_INDEX_SHIFT) struct intel_ringbuffer * intel_engine_create_ringbuffer(struct intel_engine_cs *engine, int size); int intel_pin_and_map_ringbuffer_obj(struct drm_i915_private *dev_priv, struct intel_ringbuffer *ringbuf); void intel_unpin_ringbuffer_obj(struct intel_ringbuffer *ringbuf); void intel_ringbuffer_free(struct intel_ringbuffer *ring); void intel_stop_engine(struct intel_engine_cs *engine); void intel_cleanup_engine(struct intel_engine_cs *engine); int intel_ring_alloc_request_extras(struct drm_i915_gem_request *request); int __must_check intel_ring_begin(struct drm_i915_gem_request *req, int n); int __must_check intel_ring_cacheline_align(struct drm_i915_gem_request *req);
static inline void intel_ring_emit(struct intel_engine_cs *engine, u32 data) { struct intel_ringbuffer *ringbuf = engine->buffer; iowrite32(data, ringbuf->virtual_start + ringbuf->tail); ringbuf->tail += 4; }

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static inline void intel_ring_emit_reg(struct intel_engine_cs *engine, i915_reg_t reg) { intel_ring_emit(engine, i915_mmio_reg_offset(reg)); }

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static inline void intel_ring_advance(struct intel_engine_cs *engine) { struct intel_ringbuffer *ringbuf = engine->buffer; ringbuf->tail &= ringbuf->size - 1; }

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int __intel_ring_space(int head, int tail, int size); void intel_ring_update_space(struct intel_ringbuffer *ringbuf); int __must_check intel_engine_idle(struct intel_engine_cs *engine); void intel_ring_init_seqno(struct intel_engine_cs *engine, u32 seqno); int intel_ring_flush_all_caches(struct drm_i915_gem_request *req); int intel_ring_invalidate_all_caches(struct drm_i915_gem_request *req); int intel_init_pipe_control(struct intel_engine_cs *engine, int size); void intel_fini_pipe_control(struct intel_engine_cs *engine); int intel_init_render_ring_buffer(struct drm_device *dev); int intel_init_bsd_ring_buffer(struct drm_device *dev); int intel_init_bsd2_ring_buffer(struct drm_device *dev); int intel_init_blt_ring_buffer(struct drm_device *dev); int intel_init_vebox_ring_buffer(struct drm_device *dev); u64 intel_ring_get_active_head(struct intel_engine_cs *engine);
static inline u32 intel_engine_get_seqno(struct intel_engine_cs *engine) { return intel_read_status_page(engine, I915_GEM_HWS_INDEX); }

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int init_workarounds_ring(struct intel_engine_cs *engine);
static inline u32 intel_ring_get_tail(struct intel_ringbuffer *ringbuf) { return ringbuf->tail; }

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/* * Arbitrary size for largest possible 'add request' sequence. The code paths * are complex and variable. Empirical measurement shows that the worst case * is BDW at 192 bytes (6 + 6 + 36 dwords), then ILK at 136 bytes. However, * we need to allocate double the largest single packet within that emission * to account for tail wraparound (so 6 + 6 + 72 dwords for BDW). */ #define MIN_SPACE_FOR_ADD_REQUEST 336
static inline u32 intel_hws_seqno_address(struct intel_engine_cs *engine) { return engine->status_page.gfx_addr + I915_GEM_HWS_INDEX_ADDR; }

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/* intel_breadcrumbs.c -- user interrupt bottom-half for waiters */ struct intel_wait { struct rb_node node; struct task_struct *tsk; u32 seqno; }; struct intel_signal_node { struct rb_node node; struct intel_wait wait; }; int intel_engine_init_breadcrumbs(struct intel_engine_cs *engine);
static inline void intel_wait_init(struct intel_wait *wait, u32 seqno) { wait->tsk = current; wait->seqno = seqno; }

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static inline bool intel_wait_complete(const struct intel_wait *wait) { return RB_EMPTY_NODE(&wait->node); }

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bool intel_engine_add_wait(struct intel_engine_cs *engine, struct intel_wait *wait); void intel_engine_remove_wait(struct intel_engine_cs *engine, struct intel_wait *wait); void intel_engine_enable_signaling(struct drm_i915_gem_request *request);
static inline bool intel_engine_has_waiter(struct intel_engine_cs *engine) { return READ_ONCE(engine->breadcrumbs.irq_seqno_bh); }

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static inline bool intel_engine_wakeup(struct intel_engine_cs *engine) { bool wakeup = false; struct task_struct *tsk = READ_ONCE(engine->breadcrumbs.irq_seqno_bh); /* Note that for this not to dangerously chase a dangling pointer, * the caller is responsible for ensure that the task remain valid for * wake_up_process() i.e. that the RCU grace period cannot expire. * * Also note that tsk is likely to be in !TASK_RUNNING state so an * early test for tsk->state != TASK_RUNNING before wake_up_process() * is unlikely to be beneficial. */ if (tsk) wakeup = wake_up_process(tsk); return wakeup; }

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chris wilsonchris wilson46100.00%2100.00%
Total46100.00%2100.00%

void intel_engine_enable_fake_irq(struct intel_engine_cs *engine); void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine); unsigned int intel_kick_waiters(struct drm_i915_private *i915); unsigned int intel_kick_signalers(struct drm_i915_private *i915); #endif /* _INTEL_RINGBUFFER_H_ */

Overall Contributors

PersonTokensPropCommitsCommitProp
chris wilsonchris wilson65138.68%5333.97%
zou nan haizou nan hai18110.75%21.28%
oscar mateooscar mateo16910.04%117.05%
ben widawskyben widawsky1166.89%106.41%
daniel vetterdaniel vetter1026.06%138.33%
tvrtko ursulintvrtko ursulin754.46%106.41%
mika kuoppalamika kuoppala704.16%95.77%
arun siluveryarun siluvery422.50%21.28%
john harrisonjohn harrison402.38%1610.26%
ville syrjalaville syrjala372.20%42.56%
brad volkinbrad volkin352.08%21.28%
imre deakimre deak251.49%10.64%
thomas danielthomas daniel221.31%31.92%
haihao xianghaihao xiang201.19%21.28%
dave gordondave gordon181.07%21.28%
michel thierrymichel thierry160.95%21.28%
yakui zhaoyakui zhao150.89%21.28%
nicholas hoathnicholas hoath90.53%21.28%
naresh kumar kachhinaresh kumar kachhi70.42%10.64%
jesse barnesjesse barnes70.42%10.64%
jani nikulajani nikula60.36%21.28%
abdiel janulgueabdiel janulgue40.24%10.64%
tomas elftomas elf40.24%10.64%
jordan justenjordan justen40.24%10.64%
alex daialex dai40.24%10.64%
francisco jerezfrancisco jerez30.18%10.64%
rodrigo vivirodrigo vivi10.06%10.64%
Total1683100.00%156100.00%
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