[v8,2/2] drm/i915/icl: Enhanced execution list support
diff mbox

Message ID 20180209232804.23183-2-daniele.ceraolospurio@intel.com
State New
Headers show

Commit Message

Daniele Ceraolo Spurio Feb. 9, 2018, 11:28 p.m. UTC
From: Thomas Daniel <thomas.daniel@intel.com>

Enhanced Execlists is an upgraded version of execlists which supports
up to 8 ports. The lrcs to be submitted are written to a submit queue
(the ExecLists Submission Queue - ELSQ), which is then loaded on the
HW. When writing to the ELSP register, the lrcs are written cyclically
in the queue from position 0 to position 7. Alternatively, it is
possible to write directly in the individual positions of the queue
using the ELSQC registers. To be able to re-use all the existing code
we're using the latter method and we're currently limiting ourself to
only using 2 elements.

v2: Rebase.
v3: Switch from !IS_GEN11 to GEN < 11 (Daniele Ceraolo Spurio).
v4: Use the elsq registers instead of elsp. (Daniele Ceraolo Spurio)
v5: Reword commit, rename regs to be closer to specs, turn off
    preemption (Daniele), reuse engine->execlists.elsp (Chris)
v6: use has_logical_ring_elsq to differentiate the new paths
v7: add preemption support, rename els to submit_reg (Chris)
v8: save the ctrl register inside the execlists struct, drop CSB
    handling updates (superseded by preempt_complete_status) (Chris)

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h          |  2 ++
 drivers/gpu/drm/i915/i915_pci.c          |  3 +-
 drivers/gpu/drm/i915/intel_device_info.h |  1 +
 drivers/gpu/drm/i915/intel_lrc.c         | 60 ++++++++++++++++++++++++--------
 drivers/gpu/drm/i915/intel_lrc.h         |  3 ++
 drivers/gpu/drm/i915/intel_ringbuffer.h  | 12 +++++--
 6 files changed, 63 insertions(+), 18 deletions(-)

Comments

Chris Wilson Feb. 10, 2018, 9:02 a.m. UTC | #1
Quoting Daniele Ceraolo Spurio (2018-02-09 23:28:04)
> From: Thomas Daniel <thomas.daniel@intel.com>
> 
> Enhanced Execlists is an upgraded version of execlists which supports
> up to 8 ports. The lrcs to be submitted are written to a submit queue
> (the ExecLists Submission Queue - ELSQ), which is then loaded on the
> HW. When writing to the ELSP register, the lrcs are written cyclically
> in the queue from position 0 to position 7. Alternatively, it is
> possible to write directly in the individual positions of the queue
> using the ELSQC registers. To be able to re-use all the existing code
> we're using the latter method and we're currently limiting ourself to
> only using 2 elements.
> 
> v2: Rebase.
> v3: Switch from !IS_GEN11 to GEN < 11 (Daniele Ceraolo Spurio).
> v4: Use the elsq registers instead of elsp. (Daniele Ceraolo Spurio)
> v5: Reword commit, rename regs to be closer to specs, turn off
>     preemption (Daniele), reuse engine->execlists.elsp (Chris)
> v6: use has_logical_ring_elsq to differentiate the new paths
> v7: add preemption support, rename els to submit_reg (Chris)
> v8: save the ctrl register inside the execlists struct, drop CSB
>     handling updates (superseded by preempt_complete_status) (Chris)
> 
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
> Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>

Reads very nicely, makes it look like a neat little extension. Saving
the fun for later ;)

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

Patch
diff mbox

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index acaa63f8237d..fca8569edc1e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2755,6 +2755,8 @@  intel_info(const struct drm_i915_private *dev_priv)
 
 #define HAS_LOGICAL_RING_CONTEXTS(dev_priv) \
 		((dev_priv)->info.has_logical_ring_contexts)
+#define HAS_LOGICAL_RING_ELSQ(dev_priv) \
+		((dev_priv)->info.has_logical_ring_elsq)
 #define HAS_LOGICAL_RING_PREEMPTION(dev_priv) \
 		((dev_priv)->info.has_logical_ring_preemption)
 
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 4e7a10c89782..7d5c99b241a5 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -583,7 +583,8 @@  static const struct intel_device_info intel_cannonlake_info = {
 	GEN10_FEATURES, \
 	.gen = 11, \
 	.ddb_size = 2048, \
-	.has_csr = 0
+	.has_csr = 0, \
+	.has_logical_ring_elsq = 1
 
 static const struct intel_device_info intel_icelake_11_info = {
 	GEN11_FEATURES,
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index 71fdfb0451ef..90961aba60d0 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -96,6 +96,7 @@  enum intel_platform {
 	func(has_l3_dpf); \
 	func(has_llc); \
 	func(has_logical_ring_contexts); \
+	func(has_logical_ring_elsq); \
 	func(has_logical_ring_preemption); \
 	func(has_overlay); \
 	func(has_pooled_eu); \
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 3305fbba65e9..ec7eb069a404 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -399,18 +399,30 @@  static u64 execlists_update_context(struct drm_i915_gem_request *rq)
 	return ce->lrc_desc;
 }
 
-static inline void elsp_write(u64 desc, u32 __iomem *elsp)
+static inline void write_desc(struct intel_engine_execlists *execlists, u64 desc, u32 port)
 {
-	writel(upper_32_bits(desc), elsp);
-	writel(lower_32_bits(desc), elsp);
+	if (execlists->ctrl_reg) {
+		writel(lower_32_bits(desc), execlists->submit_reg + port * 2);
+		writel(upper_32_bits(desc), execlists->submit_reg + port * 2 + 1);
+	} else {
+		writel(upper_32_bits(desc), execlists->submit_reg);
+		writel(lower_32_bits(desc), execlists->submit_reg);
+	}
 }
 
 static void execlists_submit_ports(struct intel_engine_cs *engine)
 {
-	struct execlist_port *port = engine->execlists.port;
+	struct intel_engine_execlists *execlists = &engine->execlists;
+	struct execlist_port *port = execlists->port;
 	unsigned int n;
 
-	for (n = execlists_num_ports(&engine->execlists); n--; ) {
+	/*
+	 * ELSQ note: the submit queue is not cleared after being submitted
+	 * to the HW so we need to make sure we always clean it up. This is
+	 * currently ensured by the fact that we always write the same number
+	 * of elsq entries, keep this in mind before changing the loop below.
+	 */
+	for (n = execlists_num_ports(execlists); n--; ) {
 		struct drm_i915_gem_request *rq;
 		unsigned int count;
 		u64 desc;
@@ -433,9 +445,14 @@  static void execlists_submit_ports(struct intel_engine_cs *engine)
 			desc = 0;
 		}
 
-		elsp_write(desc, engine->execlists.elsp);
+		write_desc(execlists, desc, n);
 	}
-	execlists_clear_active(&engine->execlists, EXECLISTS_ACTIVE_HWACK);
+
+	/* we need to manually load the submit queue */
+	if (execlists->ctrl_reg)
+		writel(EL_CTRL_LOAD, execlists->ctrl_reg);
+
+	execlists_clear_active(execlists, EXECLISTS_ACTIVE_HWACK);
 }
 
 static bool ctx_single_port_submission(const struct i915_gem_context *ctx)
@@ -469,11 +486,12 @@  static void port_assign(struct execlist_port *port,
 
 static void inject_preempt_context(struct intel_engine_cs *engine)
 {
+	struct intel_engine_execlists *execlists = &engine->execlists;
 	struct intel_context *ce =
 		&engine->i915->preempt_context->engine[engine->id];
 	unsigned int n;
 
-	GEM_BUG_ON(engine->execlists.preempt_complete_status !=
+	GEM_BUG_ON(execlists->preempt_complete_status !=
 		   upper_32_bits(ce->lrc_desc));
 	GEM_BUG_ON(!IS_ALIGNED(ce->ring->size, WA_TAIL_BYTES));
 
@@ -489,11 +507,16 @@  static void inject_preempt_context(struct intel_engine_cs *engine)
 				      CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT));
 
 	GEM_TRACE("%s\n", engine->name);
-	for (n = execlists_num_ports(&engine->execlists); --n; )
-		elsp_write(0, engine->execlists.elsp);
+	for (n = execlists_num_ports(execlists); --n; )
+		write_desc(execlists, 0, n);
+
+	write_desc(execlists, ce->lrc_desc, n);
+
+	/* we need to manually load the submit queue */
+	if (execlists->ctrl_reg)
+		writel(EL_CTRL_LOAD, execlists->ctrl_reg);
 
-	elsp_write(ce->lrc_desc, engine->execlists.elsp);
-	execlists_clear_active(&engine->execlists, EXECLISTS_ACTIVE_HWACK);
+	execlists_clear_active(execlists, EXECLISTS_ACTIVE_HWACK);
 }
 
 static void execlists_dequeue(struct intel_engine_cs *engine)
@@ -2068,8 +2091,15 @@  static int logical_ring_init(struct intel_engine_cs *engine)
 	if (ret)
 		goto error;
 
-	engine->execlists.elsp =
-		engine->i915->regs + i915_mmio_reg_offset(RING_ELSP(engine));
+	if (HAS_LOGICAL_RING_ELSQ(engine->i915)) {
+		engine->execlists.submit_reg = engine->i915->regs +
+			i915_mmio_reg_offset(RING_EXECLIST_SQ_CONTENTS(engine));
+		engine->execlists.ctrl_reg = engine->i915->regs +
+			i915_mmio_reg_offset(RING_EXECLIST_CONTROL(engine));
+	} else {
+		engine->execlists.submit_reg = engine->i915->regs +
+			i915_mmio_reg_offset(RING_ELSP(engine));
+	}
 
 	engine->execlists.preempt_complete_status = ~0u;
 	if (engine->i915->preempt_context)
@@ -2338,7 +2368,7 @@  populate_lr_context(struct i915_gem_context *ctx,
 	if (!engine->default_state)
 		regs[CTX_CONTEXT_CONTROL + 1] |=
 			_MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);
-	if (ctx == ctx->i915->preempt_context)
+	if (ctx == ctx->i915->preempt_context && INTEL_GEN(engine->i915) < 11)
 		regs[CTX_CONTEXT_CONTROL + 1] |=
 			_MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
 					   CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT);
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index 636ced41225d..59d7b86012e9 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -42,6 +42,9 @@ 
 #define RING_CONTEXT_STATUS_BUF_LO(engine, i)	_MMIO((engine)->mmio_base + 0x370 + (i) * 8)
 #define RING_CONTEXT_STATUS_BUF_HI(engine, i)	_MMIO((engine)->mmio_base + 0x370 + (i) * 8 + 4)
 #define RING_CONTEXT_STATUS_PTR(engine)		_MMIO((engine)->mmio_base + 0x3a0)
+#define RING_EXECLIST_SQ_CONTENTS(engine)	_MMIO((engine)->mmio_base + 0x510)
+#define RING_EXECLIST_CONTROL(engine)		_MMIO((engine)->mmio_base + 0x550)
+#define	  EL_CTRL_LOAD				(1 << 0)
 
 /* The docs specify that the write pointer wraps around after 5h, "After status
  * is written out to the last available status QW at offset 5h, this pointer
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 8f1a4badf812..eb0d0de1ffc2 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -200,9 +200,17 @@  struct intel_engine_execlists {
 	bool no_priolist;
 
 	/**
-	 * @elsp: the ExecList Submission Port register
+	 * @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 *elsp;
+	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