UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity
OpenCloudOS-Kernel/drivers/gpu/drm/i915/intel_ringbuffer.h

1138 lines
35 KiB
C
Raw Blame History

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _INTEL_RINGBUFFER_H_
#define _INTEL_RINGBUFFER_H_
#include <linux/hashtable.h>
#include <linux/seqlock.h>
#include "i915_gem_batch_pool.h"
#include "i915_reg.h"
#include "i915_pmu.h"
#include "i915_request.h"
#include "i915_selftest.h"
#include "i915_timeline.h"
#include "intel_gpu_commands.h"
struct drm_printer;
struct i915_sched_attr;
#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))
struct intel_hw_status_page {
struct i915_vma *vma;
u32 *page_addr;
u32 ggtt_offset;
};
#define I915_READ_TAIL(engine) I915_READ(RING_TAIL((engine)->mmio_base))
#define I915_WRITE_TAIL(engine, val) I915_WRITE(RING_TAIL((engine)->mmio_base), val)
#define I915_READ_START(engine) I915_READ(RING_START((engine)->mmio_base))
#define I915_WRITE_START(engine, val) I915_WRITE(RING_START((engine)->mmio_base), val)
#define I915_READ_HEAD(engine) I915_READ(RING_HEAD((engine)->mmio_base))
#define I915_WRITE_HEAD(engine, val) I915_WRITE(RING_HEAD((engine)->mmio_base), val)
#define I915_READ_CTL(engine) I915_READ(RING_CTL((engine)->mmio_base))
#define I915_WRITE_CTL(engine, val) I915_WRITE(RING_CTL((engine)->mmio_base), val)
#define I915_READ_IMR(engine) I915_READ(RING_IMR((engine)->mmio_base))
#define I915_WRITE_IMR(engine, val) I915_WRITE(RING_IMR((engine)->mmio_base), val)
#define I915_READ_MODE(engine) I915_READ(RING_MI_MODE((engine)->mmio_base))
#define I915_WRITE_MODE(engine, val) I915_WRITE(RING_MI_MODE((engine)->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.
*/
enum intel_engine_hangcheck_action {
ENGINE_IDLE = 0,
ENGINE_WAIT,
ENGINE_ACTIVE_SEQNO,
ENGINE_ACTIVE_HEAD,
ENGINE_ACTIVE_SUBUNITS,
ENGINE_WAIT_KICK,
ENGINE_DEAD,
};
static inline const char *
hangcheck_action_to_str(const enum intel_engine_hangcheck_action a)
{
switch (a) {
case ENGINE_IDLE:
return "idle";
case ENGINE_WAIT:
return "wait";
case ENGINE_ACTIVE_SEQNO:
return "active seqno";
case ENGINE_ACTIVE_HEAD:
return "active head";
case ENGINE_ACTIVE_SUBUNITS:
return "active subunits";
case ENGINE_WAIT_KICK:
return "wait kick";
case ENGINE_DEAD:
return "dead";
}
return "unknown";
}
#define I915_MAX_SLICES 3
#define I915_MAX_SUBSLICES 8
#define instdone_slice_mask(dev_priv__) \
(INTEL_GEN(dev_priv__) == 7 ? \
1 : INTEL_INFO(dev_priv__)->sseu.slice_mask)
#define instdone_subslice_mask(dev_priv__) \
(INTEL_GEN(dev_priv__) == 7 ? \
1 : INTEL_INFO(dev_priv__)->sseu.subslice_mask[0])
#define for_each_instdone_slice_subslice(dev_priv__, slice__, subslice__) \
for ((slice__) = 0, (subslice__) = 0; \
(slice__) < I915_MAX_SLICES; \
(subslice__) = ((subslice__) + 1) < I915_MAX_SUBSLICES ? (subslice__) + 1 : 0, \
(slice__) += ((subslice__) == 0)) \
for_each_if((BIT(slice__) & instdone_slice_mask(dev_priv__)) && \
(BIT(subslice__) & instdone_subslice_mask(dev_priv__)))
struct intel_instdone {
u32 instdone;
/* The following exist only in the RCS engine */
u32 slice_common;
u32 sampler[I915_MAX_SLICES][I915_MAX_SUBSLICES];
u32 row[I915_MAX_SLICES][I915_MAX_SUBSLICES];
};
struct intel_engine_hangcheck {
u64 acthd;
u32 seqno;
enum intel_engine_hangcheck_action action;
unsigned long action_timestamp;
int deadlock;
struct intel_instdone instdone;
struct i915_request *active_request;
bool stalled:1;
bool wedged:1;
};
struct intel_ring {
struct i915_vma *vma;
void *vaddr;
struct i915_timeline *timeline;
struct list_head request_list;
struct list_head active_link;
u32 head;
u32 tail;
u32 emit;
u32 space;
u32 size;
u32 effective_size;
};
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 i915_vma *vma;
};
struct i915_request;
#define I915_MAX_VCS 4
#define I915_MAX_VECS 2
/*
* Engine IDs definitions.
* Keep instances of the same type engine together.
*/
enum intel_engine_id {
RCS = 0,
BCS,
VCS,
VCS2,
VCS3,
VCS4,
#define _VCS(n) (VCS + (n))
VECS,
VECS2
#define _VECS(n) (VECS + (n))
};
struct i915_priolist {
struct rb_node node;
struct list_head requests;
int priority;
};
/**
* struct intel_engine_execlists - execlist submission queue and port state
*
* The struct intel_engine_execlists represents the combined logical state of
* driver and the hardware state for execlist mode of submission.
*/
struct intel_engine_execlists {
/**
* @tasklet: softirq tasklet for bottom handler
*/
struct tasklet_struct tasklet;
/**
* @default_priolist: priority list for I915_PRIORITY_NORMAL
*/
struct i915_priolist default_priolist;
/**
* @no_priolist: priority lists disabled
*/
bool no_priolist;
/**
* @submit_reg: gen-specific execlist submission register
* set to the ExecList Submission Port (elsp) register pre-Gen11 and to
* the ExecList Submission Queue Contents register array for Gen11+
*/
u32 __iomem *submit_reg;
/**
* @ctrl_reg: the enhanced execlists control register, used to load the
* submit queue on the HW and to request preemptions to idle
*/
u32 __iomem *ctrl_reg;
/**
* @port: execlist port states
*
* For each hardware ELSP (ExecList Submission Port) we keep
* track of the last request and the number of times we submitted
* that port to hw. We then count the number of times the hw reports
* a context completion or preemption. As only one context can
* be active on hw, we limit resubmission of context to port[0]. This
* is called Lite Restore, of the context.
*/
struct execlist_port {
/**
* @request_count: combined request and submission count
*/
struct i915_request *request_count;
#define EXECLIST_COUNT_BITS 2
#define port_request(p) ptr_mask_bits((p)->request_count, EXECLIST_COUNT_BITS)
#define port_count(p) ptr_unmask_bits((p)->request_count, EXECLIST_COUNT_BITS)
#define port_pack(rq, count) ptr_pack_bits(rq, count, EXECLIST_COUNT_BITS)
#define port_unpack(p, count) ptr_unpack_bits((p)->request_count, count, EXECLIST_COUNT_BITS)
#define port_set(p, packed) ((p)->request_count = (packed))
#define port_isset(p) ((p)->request_count)
#define port_index(p, execlists) ((p) - (execlists)->port)
/**
* @context_id: context ID for port
*/
GEM_DEBUG_DECL(u32 context_id);
#define EXECLIST_MAX_PORTS 2
} port[EXECLIST_MAX_PORTS];
/**
* @active: is the HW active? We consider the HW as active after
* submitting any context for execution and until we have seen the
* last context completion event. After that, we do not expect any
* more events until we submit, and so can park the HW.
*
* As we have a small number of different sources from which we feed
* the HW, we track the state of each inside a single bitfield.
*/
unsigned int active;
#define EXECLISTS_ACTIVE_USER 0
#define EXECLISTS_ACTIVE_PREEMPT 1
#define EXECLISTS_ACTIVE_HWACK 2
/**
* @port_mask: number of execlist ports - 1
*/
unsigned int port_mask;
/**
* @queue_priority: Highest pending priority.
*
* When we add requests into the queue, or adjust the priority of
* executing requests, we compute the maximum priority of those
* pending requests. We can then use this value to determine if
* we need to preempt the executing requests to service the queue.
*/
int queue_priority;
/**
* @queue: queue of requests, in priority lists
*/
struct rb_root queue;
/**
* @first: leftmost level in priority @queue
*/
struct rb_node *first;
/**
* @fw_domains: forcewake domains for irq tasklet
*/
unsigned int fw_domains;
/**
* @csb_head: context status buffer head
*/
unsigned int csb_head;
/**
* @csb_use_mmio: access csb through mmio, instead of hwsp
*/
bool csb_use_mmio;
/**
* @preempt_complete_status: expected CSB upon completing preemption
*/
u32 preempt_complete_status;
};
#define INTEL_ENGINE_CS_MAX_NAME 8
struct intel_engine_cs {
struct drm_i915_private *i915;
char name[INTEL_ENGINE_CS_MAX_NAME];
enum intel_engine_id id;
unsigned int hw_id;
unsigned int guc_id;
u8 uabi_id;
u8 uabi_class;
u8 class;
u8 instance;
u32 context_size;
u32 mmio_base;
struct intel_ring *buffer;
struct i915_timeline timeline;
struct drm_i915_gem_object *default_state;
void *pinned_default_state;
atomic_t irq_count;
unsigned long irq_posted;
#define ENGINE_IRQ_BREADCRUMB 0
#define ENGINE_IRQ_EXECLIST 1
/* 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 {
spinlock_t irq_lock; /* protects irq_*; irqsafe */
struct intel_wait *irq_wait; /* oldest waiter by retirement */
spinlock_t rb_lock; /* protects the rb and wraps irq_lock */
struct rb_root waiters; /* sorted by retirement, priority */
struct list_head signals; /* sorted by retirement */
struct task_struct *signaler; /* used for fence signalling */
struct timer_list fake_irq; /* used after a missed interrupt */
struct timer_list hangcheck; /* detect missed interrupts */
unsigned int hangcheck_interrupts;
unsigned int irq_enabled;
bool irq_armed : 1;
I915_SELFTEST_DECLARE(bool mock : 1);
} breadcrumbs;
struct {
/**
* @enable: Bitmask of enable sample events on this engine.
*
* Bits correspond to sample event types, for instance
* I915_SAMPLE_QUEUED is bit 0 etc.
*/
u32 enable;
/**
* @enable_count: Reference count for the enabled samplers.
*
* Index number corresponds to the bit number from @enable.
*/
unsigned int enable_count[I915_PMU_SAMPLE_BITS];
/**
* @sample: Counter values for sampling events.
*
* Our internal timer stores the current counters in this field.
*/
#define I915_ENGINE_SAMPLE_MAX (I915_SAMPLE_SEMA + 1)
struct i915_pmu_sample sample[I915_ENGINE_SAMPLE_MAX];
} pmu;
/*
* 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;
struct i915_vma *scratch;
u32 irq_keep_mask; /* always keep these interrupts */
u32 irq_enable_mask; /* bitmask to enable ring interrupt */
void (*irq_enable)(struct intel_engine_cs *engine);
void (*irq_disable)(struct intel_engine_cs *engine);
int (*init_hw)(struct intel_engine_cs *engine);
struct {
struct i915_request *(*prepare)(struct intel_engine_cs *engine);
void (*reset)(struct intel_engine_cs *engine,
struct i915_request *rq);
void (*finish)(struct intel_engine_cs *engine);
} reset;
void (*park)(struct intel_engine_cs *engine);
void (*unpark)(struct intel_engine_cs *engine);
void (*set_default_submission)(struct intel_engine_cs *engine);
struct intel_context *(*context_pin)(struct intel_engine_cs *engine,
struct i915_gem_context *ctx);
int (*request_alloc)(struct i915_request *rq);
int (*init_context)(struct i915_request *rq);
int (*emit_flush)(struct i915_request *request, u32 mode);
#define EMIT_INVALIDATE BIT(0)
#define EMIT_FLUSH BIT(1)
#define EMIT_BARRIER (EMIT_INVALIDATE | EMIT_FLUSH)
int (*emit_bb_start)(struct i915_request *rq,
u64 offset, u32 length,
unsigned int dispatch_flags);
#define I915_DISPATCH_SECURE BIT(0)
#define I915_DISPATCH_PINNED BIT(1)
#define I915_DISPATCH_RS BIT(2)
void (*emit_breadcrumb)(struct i915_request *rq, u32 *cs);
int emit_breadcrumb_sz;
/* Pass the request to the hardware queue (e.g. directly into
* the legacy ringbuffer or to the end of an execlist).
*
* This is called from an atomic context with irqs disabled; must
* be irq safe.
*/
void (*submit_request)(struct i915_request *rq);
/* Call when the priority on a request has changed and it and its
* dependencies may need rescheduling. Note the request itself may
* not be ready to run!
*
* Called under the struct_mutex.
*/
void (*schedule)(struct i915_request *request,
const struct i915_sched_attr *attr);
/*
* Cancel all requests on the hardware, or queued for execution.
* This should only cancel the ready requests that have been
* submitted to the engine (via the engine->submit_request callback).
* This is called when marking the device as wedged.
*/
void (*cancel_requests)(struct intel_engine_cs *engine);
/* 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 *engine);
void (*cleanup)(struct intel_engine_cs *engine);
/* 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 {
#define GEN6_SEMAPHORE_LAST VECS_HW
#define GEN6_NUM_SEMAPHORES (GEN6_SEMAPHORE_LAST + 1)
#define GEN6_SEMAPHORES_MASK GENMASK(GEN6_SEMAPHORE_LAST, 0)
struct {
/* our mbox written by others */
u32 wait[GEN6_NUM_SEMAPHORES];
/* mboxes this ring signals to */
i915_reg_t signal[GEN6_NUM_SEMAPHORES];
} mbox;
/* AKA wait() */
int (*sync_to)(struct i915_request *rq,
struct i915_request *signal);
u32 *(*signal)(struct i915_request *rq, u32 *cs);
} semaphore;
struct intel_engine_execlists execlists;
/* Contexts are pinned whilst they are active on the GPU. The last
* context executed remains active whilst the GPU is idle - the
* switch away and write to the context object only occurs on the
* next execution. Contexts are only unpinned on retirement of the
* following request ensuring that we can always write to the object
* on the context switch even after idling. Across suspend, we switch
* to the kernel context and trash it as the save may not happen
* before the hardware is powered down.
*/
struct intel_context *last_retired_context;
/* status_notifier: list of callbacks for context-switch changes */
struct atomic_notifier_head context_status_notifier;
struct intel_engine_hangcheck hangcheck;
#define I915_ENGINE_NEEDS_CMD_PARSER BIT(0)
#define I915_ENGINE_SUPPORTS_STATS BIT(1)
#define I915_ENGINE_HAS_PREEMPTION BIT(2)
unsigned int flags;
/*
* Table of commands the command parser needs to know about
* for this engine.
*/
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 engine's
* cmd_tables, it gets the command's length based on the table entry.
* If not, it calls this function to determine the per-engine length
* field encoding for the command (i.e. different opcode ranges use
* certain bits to encode the command length in the header).
*/
u32 (*get_cmd_length_mask)(u32 cmd_header);
struct {
/**
* @lock: Lock protecting the below fields.
*/
seqlock_t lock;
/**
* @enabled: Reference count indicating number of listeners.
*/
unsigned int enabled;
/**
* @active: Number of contexts currently scheduled in.
*/
unsigned int active;
/**
* @enabled_at: Timestamp when busy stats were enabled.
*/
ktime_t enabled_at;
/**
* @start: Timestamp of the last idle to active transition.
*
* Idle is defined as active == 0, active is active > 0.
*/
ktime_t start;
/**
* @total: Total time this engine was busy.
*
* Accumulated time not counting the most recent block in cases
* where engine is currently busy (active > 0).
*/
ktime_t total;
} stats;
};
static inline bool
intel_engine_needs_cmd_parser(const struct intel_engine_cs *engine)
{
return engine->flags & I915_ENGINE_NEEDS_CMD_PARSER;
}
static inline bool
intel_engine_supports_stats(const struct intel_engine_cs *engine)
{
return engine->flags & I915_ENGINE_SUPPORTS_STATS;
}
static inline bool
intel_engine_has_preemption(const struct intel_engine_cs *engine)
{
return engine->flags & I915_ENGINE_HAS_PREEMPTION;
}
static inline bool __execlists_need_preempt(int prio, int last)
{
return prio > max(0, last);
}
static inline void
execlists_set_active(struct intel_engine_execlists *execlists,
unsigned int bit)
{
__set_bit(bit, (unsigned long *)&execlists->active);
}
static inline bool
execlists_set_active_once(struct intel_engine_execlists *execlists,
unsigned int bit)
{
return !__test_and_set_bit(bit, (unsigned long *)&execlists->active);
}
static inline void
execlists_clear_active(struct intel_engine_execlists *execlists,
unsigned int bit)
{
__clear_bit(bit, (unsigned long *)&execlists->active);
}
static inline bool
execlists_is_active(const struct intel_engine_execlists *execlists,
unsigned int bit)
{
return test_bit(bit, (unsigned long *)&execlists->active);
}
void execlists_user_begin(struct intel_engine_execlists *execlists,
const struct execlist_port *port);
void execlists_user_end(struct intel_engine_execlists *execlists);
void
execlists_cancel_port_requests(struct intel_engine_execlists * const execlists);
void
execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists);
static inline unsigned int
execlists_num_ports(const struct intel_engine_execlists * const execlists)
{
return execlists->port_mask + 1;
}
static inline struct execlist_port *
execlists_port_complete(struct intel_engine_execlists * const execlists,
struct execlist_port * const port)
{
const unsigned int m = execlists->port_mask;
GEM_BUG_ON(port_index(port, execlists) != 0);
GEM_BUG_ON(!execlists_is_active(execlists, EXECLISTS_ACTIVE_USER));
memmove(port, port + 1, m * sizeof(struct execlist_port));
memset(port + m, 0, sizeof(struct execlist_port));
return port;
}
static inline unsigned int
intel_engine_flag(const struct intel_engine_cs *engine)
{
return BIT(engine->id);
}
static inline u32
intel_read_status_page(const 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]);
}
static inline void
intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
{
/* Writing into the status page should be done sparingly. Since
* we do when we are uncertain of the device state, we take a bit
* of extra paranoia to try and ensure that the HWS takes the value
* we give and that it doesn't end up trapped inside the CPU!
*/
if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
mb();
clflush(&engine->status_page.page_addr[reg]);
engine->status_page.page_addr[reg] = value;
clflush(&engine->status_page.page_addr[reg]);
mb();
} else {
WRITE_ONCE(engine->status_page.page_addr[reg], value);
}
}
/*
* 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_PREEMPT_INDEX 0x32
#define I915_GEM_HWS_PREEMPT_ADDR (I915_GEM_HWS_PREEMPT_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)
#define I915_HWS_CSB_BUF0_INDEX 0x10
#define I915_HWS_CSB_WRITE_INDEX 0x1f
#define CNL_HWS_CSB_WRITE_INDEX 0x2f
struct intel_ring *
intel_engine_create_ring(struct intel_engine_cs *engine,
struct i915_timeline *timeline,
int size);
int intel_ring_pin(struct intel_ring *ring,
struct drm_i915_private *i915,
unsigned int offset_bias);
void intel_ring_reset(struct intel_ring *ring, u32 tail);
unsigned int intel_ring_update_space(struct intel_ring *ring);
void intel_ring_unpin(struct intel_ring *ring);
void intel_ring_free(struct intel_ring *ring);
void intel_engine_stop(struct intel_engine_cs *engine);
void intel_engine_cleanup(struct intel_engine_cs *engine);
void intel_legacy_submission_resume(struct drm_i915_private *dev_priv);
int __must_check intel_ring_cacheline_align(struct i915_request *rq);
int intel_ring_wait_for_space(struct intel_ring *ring, unsigned int bytes);
u32 __must_check *intel_ring_begin(struct i915_request *rq, unsigned int n);
static inline void intel_ring_advance(struct i915_request *rq, u32 *cs)
{
/* Dummy function.
*
* This serves as a placeholder in the code so that the reader
* can compare against the preceding intel_ring_begin() and
* check that the number of dwords emitted matches the space
* reserved for the command packet (i.e. the value passed to
* intel_ring_begin()).
*/
GEM_BUG_ON((rq->ring->vaddr + rq->ring->emit) != cs);
}
static inline u32 intel_ring_wrap(const struct intel_ring *ring, u32 pos)
{
return pos & (ring->size - 1);
}
static inline bool
intel_ring_offset_valid(const struct intel_ring *ring,
unsigned int pos)
{
if (pos & -ring->size) /* must be strictly within the ring */
return false;
if (!IS_ALIGNED(pos, 8)) /* must be qword aligned */
return false;
return true;
}
static inline u32 intel_ring_offset(const struct i915_request *rq, void *addr)
{
/* Don't write ring->size (equivalent to 0) as that hangs some GPUs. */
u32 offset = addr - rq->ring->vaddr;
GEM_BUG_ON(offset > rq->ring->size);
return intel_ring_wrap(rq->ring, offset);
}
static inline void
assert_ring_tail_valid(const struct intel_ring *ring, unsigned int tail)
{
GEM_BUG_ON(!intel_ring_offset_valid(ring, tail));
/*
* "Ring Buffer Use"
* Gen2 BSpec "1. Programming Environment" / 1.4.4.6
* Gen3 BSpec "1c Memory Interface Functions" / 2.3.4.5
* Gen4+ BSpec "1c Memory Interface and Command Stream" / 5.3.4.5
* "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."
*
* We use ring->head as the last known location of the actual RING_HEAD,
* it may have advanced but in the worst case it is equally the same
* as ring->head and so we should never program RING_TAIL to advance
* into the same cacheline as ring->head.
*/
#define cacheline(a) round_down(a, CACHELINE_BYTES)
GEM_BUG_ON(cacheline(tail) == cacheline(ring->head) &&
tail < ring->head);
#undef cacheline
}
static inline unsigned int
intel_ring_set_tail(struct intel_ring *ring, unsigned int tail)
{
/* Whilst writes to the tail are strictly order, there is no
* serialisation between readers and the writers. The tail may be
* read by i915_request_retire() just as it is being updated
* by execlists, as although the breadcrumb is complete, the context
* switch hasn't been seen.
*/
assert_ring_tail_valid(ring, tail);
ring->tail = tail;
return tail;
}
void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno);
void intel_engine_setup_common(struct intel_engine_cs *engine);
int intel_engine_init_common(struct intel_engine_cs *engine);
void intel_engine_cleanup_common(struct intel_engine_cs *engine);
int intel_engine_create_scratch(struct intel_engine_cs *engine,
unsigned int size);
void intel_engine_cleanup_scratch(struct intel_engine_cs *engine);
int intel_init_render_ring_buffer(struct intel_engine_cs *engine);
int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine);
int intel_init_blt_ring_buffer(struct intel_engine_cs *engine);
int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine);
int intel_engine_stop_cs(struct intel_engine_cs *engine);
u64 intel_engine_get_active_head(const struct intel_engine_cs *engine);
u64 intel_engine_get_last_batch_head(const 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);
}
static inline u32 intel_engine_last_submit(struct intel_engine_cs *engine)
{
/* We are only peeking at the tail of the submit queue (and not the
* queue itself) in order to gain a hint as to the current active
* state of the engine. Callers are not expected to be taking
* engine->timeline->lock, nor are they expected to be concerned
* wtih serialising this hint with anything, so document it as
* a hint and nothing more.
*/
return READ_ONCE(engine->timeline.seqno);
}
void intel_engine_get_instdone(struct intel_engine_cs *engine,
struct intel_instdone *instdone);
/*
* 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.ggtt_offset + I915_GEM_HWS_INDEX_ADDR;
}
static inline u32 intel_hws_preempt_done_address(struct intel_engine_cs *engine)
{
return engine->status_page.ggtt_offset + I915_GEM_HWS_PREEMPT_ADDR;
}
/* intel_breadcrumbs.c -- user interrupt bottom-half for waiters */
int intel_engine_init_breadcrumbs(struct intel_engine_cs *engine);
static inline void intel_wait_init(struct intel_wait *wait,
struct i915_request *rq)
{
wait->tsk = current;
wait->request = rq;
}
static inline void intel_wait_init_for_seqno(struct intel_wait *wait, u32 seqno)
{
wait->tsk = current;
wait->seqno = seqno;
}
static inline bool intel_wait_has_seqno(const struct intel_wait *wait)
{
return wait->seqno;
}
static inline bool
intel_wait_update_seqno(struct intel_wait *wait, u32 seqno)
{
wait->seqno = seqno;
return intel_wait_has_seqno(wait);
}
static inline bool
intel_wait_update_request(struct intel_wait *wait,
const struct i915_request *rq)
{
return intel_wait_update_seqno(wait, i915_request_global_seqno(rq));
}
static inline bool
intel_wait_check_seqno(const struct intel_wait *wait, u32 seqno)
{
return wait->seqno == seqno;
}
static inline bool
intel_wait_check_request(const struct intel_wait *wait,
const struct i915_request *rq)
{
return intel_wait_check_seqno(wait, i915_request_global_seqno(rq));
}
static inline bool intel_wait_complete(const struct intel_wait *wait)
{
return RB_EMPTY_NODE(&wait->node);
}
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);
bool intel_engine_enable_signaling(struct i915_request *request, bool wakeup);
void intel_engine_cancel_signaling(struct i915_request *request);
static inline bool intel_engine_has_waiter(const struct intel_engine_cs *engine)
{
return READ_ONCE(engine->breadcrumbs.irq_wait);
}
unsigned int intel_engine_wakeup(struct intel_engine_cs *engine);
#define ENGINE_WAKEUP_WAITER BIT(0)
#define ENGINE_WAKEUP_ASLEEP BIT(1)
void intel_engine_pin_breadcrumbs_irq(struct intel_engine_cs *engine);
void intel_engine_unpin_breadcrumbs_irq(struct intel_engine_cs *engine);
void __intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine);
void intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine);
void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine);
void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine);
static inline u32 *gen8_emit_pipe_control(u32 *batch, u32 flags, u32 offset)
{
memset(batch, 0, 6 * sizeof(u32));
batch[0] = GFX_OP_PIPE_CONTROL(6);
batch[1] = flags;
batch[2] = offset;
return batch + 6;
}
static inline u32 *
gen8_emit_ggtt_write_rcs(u32 *cs, u32 value, u32 gtt_offset)
{
/* We're using qword write, offset should be aligned to 8 bytes. */
GEM_BUG_ON(!IS_ALIGNED(gtt_offset, 8));
/* w/a for post sync ops following a GPGPU operation we
* need a prior CS_STALL, which is emitted by the flush
* following the batch.
*/
*cs++ = GFX_OP_PIPE_CONTROL(6);
*cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE;
*cs++ = gtt_offset;
*cs++ = 0;
*cs++ = value;
/* We're thrashing one dword of HWS. */
*cs++ = 0;
return cs;
}
static inline u32 *
gen8_emit_ggtt_write(u32 *cs, u32 value, u32 gtt_offset)
{
/* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */
GEM_BUG_ON(gtt_offset & (1 << 5));
/* Offset should be aligned to 8 bytes for both (QW/DW) write types */
GEM_BUG_ON(!IS_ALIGNED(gtt_offset, 8));
*cs++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW;
*cs++ = gtt_offset | MI_FLUSH_DW_USE_GTT;
*cs++ = 0;
*cs++ = value;
return cs;
}
bool intel_engine_is_idle(struct intel_engine_cs *engine);
bool intel_engines_are_idle(struct drm_i915_private *dev_priv);
bool intel_engine_has_kernel_context(const struct intel_engine_cs *engine);
void intel_engine_lost_context(struct intel_engine_cs *engine);
void intel_engines_park(struct drm_i915_private *i915);
void intel_engines_unpark(struct drm_i915_private *i915);
void intel_engines_reset_default_submission(struct drm_i915_private *i915);
unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915);
bool intel_engine_can_store_dword(struct intel_engine_cs *engine);
__printf(3, 4)
void intel_engine_dump(struct intel_engine_cs *engine,
struct drm_printer *m,
const char *header, ...);
struct intel_engine_cs *
intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance);
static inline void intel_engine_context_in(struct intel_engine_cs *engine)
{
unsigned long flags;
if (READ_ONCE(engine->stats.enabled) == 0)
return;
write_seqlock_irqsave(&engine->stats.lock, flags);
if (engine->stats.enabled > 0) {
if (engine->stats.active++ == 0)
engine->stats.start = ktime_get();
GEM_BUG_ON(engine->stats.active == 0);
}
write_sequnlock_irqrestore(&engine->stats.lock, flags);
}
static inline void intel_engine_context_out(struct intel_engine_cs *engine)
{
unsigned long flags;
if (READ_ONCE(engine->stats.enabled) == 0)
return;
write_seqlock_irqsave(&engine->stats.lock, flags);
if (engine->stats.enabled > 0) {
ktime_t last;
if (engine->stats.active && --engine->stats.active == 0) {
/*
* Decrement the active context count and in case GPU
* is now idle add up to the running total.
*/
last = ktime_sub(ktime_get(), engine->stats.start);
engine->stats.total = ktime_add(engine->stats.total,
last);
} else if (engine->stats.active == 0) {
/*
* After turning on engine stats, context out might be
* the first event in which case we account from the
* time stats gathering was turned on.
*/
last = ktime_sub(ktime_get(), engine->stats.enabled_at);
engine->stats.total = ktime_add(engine->stats.total,
last);
}
}
write_sequnlock_irqrestore(&engine->stats.lock, flags);
}
int intel_enable_engine_stats(struct intel_engine_cs *engine);
void intel_disable_engine_stats(struct intel_engine_cs *engine);
ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine);
#endif /* _INTEL_RINGBUFFER_H_ */
Reference in New Issue View Git Blame Copy Permalink