From 76e70087d360fdbe97f24c205d585ada04126e5f Mon Sep 17 00:00:00 2001 From: Mika Kuoppala Date: Fri, 22 Sep 2017 15:43:07 +0300 Subject: [PATCH] drm/i915: Make execlist port count variable As we emulate execlists on top of the GuC workqueue, it is not restricted to just 2 ports and we can increase that number arbitrarily to trade-off queue depth (i.e. scheduling latency) against pipeline bubbles. v2: rebase. better commit msg (Chris) v3: rebase Signed-off-by: Mika Kuoppala Reviewed-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20170922124307.10914-5-mika.kuoppala@intel.com --- drivers/gpu/drm/i915/i915_debugfs.c | 10 +++++----- drivers/gpu/drm/i915/i915_drv.h | 3 ++- drivers/gpu/drm/i915/i915_gpu_error.c | 17 ++++++++++++----- drivers/gpu/drm/i915/i915_guc_submission.c | 8 ++++++-- drivers/gpu/drm/i915/intel_engine_cs.c | 4 ++++ drivers/gpu/drm/i915/intel_lrc.c | 6 ++++-- drivers/gpu/drm/i915/intel_ringbuffer.h | 21 +++++++++++++++++---- 7 files changed, 50 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 87e06da55a69..d10d71aa4b0e 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -3312,6 +3312,7 @@ static int i915_engine_info(struct seq_file *m, void *unused) if (i915_modparams.enable_execlists) { const u32 *hws = &engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX]; + struct intel_engine_execlists * const execlists = &engine->execlists; u32 ptr, read, write; unsigned int idx; @@ -3323,7 +3324,7 @@ static int i915_engine_info(struct seq_file *m, void *unused) read = GEN8_CSB_READ_PTR(ptr); write = GEN8_CSB_WRITE_PTR(ptr); seq_printf(m, "\tExeclist CSB read %d [%d cached], write %d [%d from hws], interrupt posted? %s\n", - read, engine->execlists.csb_head, + read, execlists->csb_head, write, intel_read_status_page(engine, intel_hws_csb_write_index(engine->i915)), yesno(test_bit(ENGINE_IRQ_EXECLIST, @@ -3345,11 +3346,10 @@ static int i915_engine_info(struct seq_file *m, void *unused) } rcu_read_lock(); - for (idx = 0; idx < ARRAY_SIZE(engine->execlists.port); idx++) { + for (idx = 0; idx < execlists_num_ports(execlists); idx++) { unsigned int count; - rq = port_unpack(&engine->execlists.port[idx], - &count); + rq = port_unpack(&execlists->port[idx], &count); if (rq) { seq_printf(m, "\t\tELSP[%d] count=%d, ", idx, count); @@ -3362,7 +3362,7 @@ static int i915_engine_info(struct seq_file *m, void *unused) rcu_read_unlock(); spin_lock_irq(&engine->timeline->lock); - for (rb = engine->execlists.first; rb; rb = rb_next(rb)) { + for (rb = execlists->first; rb; rb = rb_next(rb)) { struct i915_priolist *p = rb_entry(rb, typeof(*p), node); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index d6babe7d362d..0f26aa57a922 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1001,7 +1001,8 @@ struct i915_gpu_state { u32 seqno; u32 head; u32 tail; - } *requests, execlist[2]; + } *requests, execlist[EXECLIST_MAX_PORTS]; + unsigned int num_ports; struct drm_i915_error_waiter { char comm[TASK_COMM_LEN]; diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index 20a1f034bf95..881fbe8d179b 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -396,6 +396,8 @@ static void error_print_context(struct drm_i915_error_state_buf *m, static void error_print_engine(struct drm_i915_error_state_buf *m, const struct drm_i915_error_engine *ee) { + int n; + err_printf(m, "%s command stream:\n", engine_str(ee->engine_id)); err_printf(m, " START: 0x%08x\n", ee->start); err_printf(m, " HEAD: 0x%08x [0x%08x]\n", ee->head, ee->rq_head); @@ -465,8 +467,11 @@ static void error_print_engine(struct drm_i915_error_state_buf *m, jiffies_to_msecs(jiffies - ee->hangcheck_timestamp)); err_printf(m, " engine reset count: %u\n", ee->reset_count); - error_print_request(m, " ELSP[0]: ", &ee->execlist[0]); - error_print_request(m, " ELSP[1]: ", &ee->execlist[1]); + for (n = 0; n < ee->num_ports; n++) { + err_printf(m, " ELSP[%d]:", n); + error_print_request(m, " ", &ee->execlist[n]); + } + error_print_context(m, " Active context: ", &ee->context); } @@ -1327,17 +1332,19 @@ static void engine_record_requests(struct intel_engine_cs *engine, static void error_record_engine_execlists(struct intel_engine_cs *engine, struct drm_i915_error_engine *ee) { - const struct execlist_port *port = engine->execlists.port; + const struct intel_engine_execlists * const execlists = &engine->execlists; unsigned int n; - for (n = 0; n < ARRAY_SIZE(engine->execlists.port); n++) { - struct drm_i915_gem_request *rq = port_request(&port[n]); + for (n = 0; n < execlists_num_ports(execlists); n++) { + struct drm_i915_gem_request *rq = port_request(&execlists->port[n]); if (!rq) break; record_request(rq, &ee->execlist[n]); } + + ee->num_ports = n; } static void record_context(struct drm_i915_error_context *e, diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c index 55e15a57c3d9..04f1281d81a5 100644 --- a/drivers/gpu/drm/i915/i915_guc_submission.c +++ b/drivers/gpu/drm/i915/i915_guc_submission.c @@ -562,6 +562,8 @@ static void i915_guc_dequeue(struct intel_engine_cs *engine) struct intel_engine_execlists * const execlists = &engine->execlists; struct execlist_port *port = execlists->port; struct drm_i915_gem_request *last = NULL; + const struct execlist_port * const last_port = + &execlists->port[execlists->port_mask]; bool submit = false; struct rb_node *rb; @@ -577,7 +579,7 @@ static void i915_guc_dequeue(struct intel_engine_cs *engine) list_for_each_entry_safe(rq, rn, &p->requests, priotree.link) { if (last && rq->ctx != last->ctx) { - if (port != execlists->port) { + if (port == last_port) { __list_del_many(&p->requests, &rq->priotree.link); goto done; @@ -617,6 +619,8 @@ static void i915_guc_irq_handler(unsigned long data) struct intel_engine_cs * const engine = (struct intel_engine_cs *)data; struct intel_engine_execlists * const execlists = &engine->execlists; struct execlist_port *port = execlists->port; + const struct execlist_port * const last_port = + &execlists->port[execlists->port_mask]; struct drm_i915_gem_request *rq; rq = port_request(&port[0]); @@ -629,7 +633,7 @@ static void i915_guc_irq_handler(unsigned long data) rq = port_request(&port[0]); } - if (!port_isset(&port[1])) + if (!port_isset(last_port)) i915_guc_dequeue(engine); } diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index 30035e59a784..a28e2a864cf1 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -405,6 +405,10 @@ static void intel_engine_init_execlist(struct intel_engine_cs *engine) execlists->csb_use_mmio = csb_force_mmio(engine->i915); + execlists->port_mask = 1; + BUILD_BUG_ON_NOT_POWER_OF_2(execlists_num_ports(execlists)); + GEM_BUG_ON(execlists_num_ports(execlists) > EXECLIST_MAX_PORTS); + execlists->queue = RB_ROOT; execlists->first = NULL; } diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 3b03f19f1395..f91e126a7f97 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -399,7 +399,7 @@ static void execlists_submit_ports(struct intel_engine_cs *engine) engine->i915->regs + i915_mmio_reg_offset(RING_ELSP(engine)); unsigned int n; - for (n = ARRAY_SIZE(engine->execlists.port); n--; ) { + for (n = execlists_num_ports(&engine->execlists); n--; ) { struct drm_i915_gem_request *rq; unsigned int count; u64 desc; @@ -456,6 +456,8 @@ static void execlists_dequeue(struct intel_engine_cs *engine) struct drm_i915_gem_request *last; struct intel_engine_execlists * const execlists = &engine->execlists; struct execlist_port *port = execlists->port; + const struct execlist_port * const last_port = + &execlists->port[execlists->port_mask]; struct rb_node *rb; bool submit = false; @@ -515,7 +517,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine) * combine this request with the last, then we * are done. */ - if (port != execlists->port) { + if (port == last_port) { __list_del_many(&p->requests, &rq->priotree.link); goto done; diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 0eae5936bc3c..56d7ae9f298b 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -234,7 +234,14 @@ struct intel_engine_execlists { * @context_id: context ID for port */ GEM_DEBUG_DECL(u32 context_id); - } port[2]; + +#define EXECLIST_MAX_PORTS 2 + } port[EXECLIST_MAX_PORTS]; + + /** + * @port_mask: number of execlist ports - 1 + */ + unsigned int port_mask; /** * @queue: queue of requests, in priority lists @@ -511,16 +518,22 @@ struct intel_engine_cs { u32 (*get_cmd_length_mask)(u32 cmd_header); }; +static inline unsigned int +execlists_num_ports(const struct intel_engine_execlists * const execlists) +{ + return execlists->port_mask + 1; +} + static inline void execlists_port_complete(struct intel_engine_execlists * const execlists, struct execlist_port * const port) { - struct execlist_port * const port1 = &execlists->port[1]; + const unsigned int m = execlists->port_mask; GEM_BUG_ON(port_index(port, execlists) != 0); - *port = *port1; - memset(port1, 0, sizeof(struct execlist_port)); + memmove(port, port + 1, m * sizeof(struct execlist_port)); + memset(port + m, 0, sizeof(struct execlist_port)); } static inline unsigned int -- 2.20.1