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From: Ramalingam C <ramalingam.c@intel.com>
To: intel-gfx <intel-gfx@lists.freedesktop.org>,
	dri-devel <dri-devel@lists.freedesktop.org>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>,
	Hellstrom Thomas <thomas.hellstrom@intel.com>,
	Chris Wilson <chris@chris-wilson.co.uk>
Subject: [PATCH 1/4] drm/i915/gt: Explicitly clear BB_OFFSET for new contexts
Date: Mon, 14 Mar 2022 23:50:02 +0530	[thread overview]
Message-ID: <20220314182005.17071-2-ramalingam.c@intel.com> (raw)
In-Reply-To: <20220314182005.17071-1-ramalingam.c@intel.com>

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

Even though the initial protocontext we load onto HW has the register
cleared, by the time we save it into the default image, BB_OFFSET has
had the enable bit set. Reclear BB_OFFSET for each new context.

Testcase: igt/i915_selftests/gt_lrc

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_regs.h |  1 +
 drivers/gpu/drm/i915/gt/intel_lrc.c         | 17 +++++++++++++++++
 drivers/gpu/drm/i915/gt/selftest_lrc.c      |  5 +++++
 3 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_regs.h b/drivers/gpu/drm/i915/gt/intel_engine_regs.h
index 0bf8b45c9319..d6da3bbf66f8 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_regs.h
@@ -109,6 +109,7 @@
 #define RING_SBBSTATE(base)			_MMIO((base) + 0x118) /* hsw+ */
 #define RING_SBBADDR_UDW(base)			_MMIO((base) + 0x11c) /* gen8+ */
 #define RING_BBADDR(base)			_MMIO((base) + 0x140)
+#define RING_BB_OFFSET(base)			_MMIO((base) + 0x158)
 #define RING_BBADDR_UDW(base)			_MMIO((base) + 0x168) /* gen8+ */
 #define CCID(base)				_MMIO((base) + 0x180)
 #define   CCID_EN				BIT(0)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 07bef7128fdb..f673bae97a03 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -662,6 +662,18 @@ static int lrc_ring_mi_mode(const struct intel_engine_cs *engine)
 		return -1;
 }
 
+static int lrc_ring_bb_offset(const struct intel_engine_cs *engine)
+{
+	if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 50))
+		return 0x80;
+	else if (GRAPHICS_VER(engine->i915) >= 12)
+		return 0x70;
+	else if (GRAPHICS_VER(engine->i915) >= 9)
+		return 0x64;
+	else
+		return -1;
+}
+
 static int lrc_ring_gpr0(const struct intel_engine_cs *engine)
 {
 	if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 50))
@@ -768,6 +780,7 @@ static void init_common_regs(u32 * const regs,
 			     bool inhibit)
 {
 	u32 ctl;
+	int loc;
 
 	ctl = _MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH);
 	ctl |= _MASKED_BIT_DISABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);
@@ -779,6 +792,10 @@ static void init_common_regs(u32 * const regs,
 	regs[CTX_CONTEXT_CONTROL] = ctl;
 
 	regs[CTX_TIMESTAMP] = ce->runtime.last;
+
+	loc = lrc_ring_bb_offset(engine);
+	if  (loc != -1)
+		regs[loc + 1] = 0;
 }
 
 static void init_wa_bb_regs(u32 * const regs,
diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 21c29d315cc0..13f57c7c4224 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -323,6 +323,11 @@ static int live_lrc_fixed(void *arg)
 				lrc_ring_cmd_buf_cctl(engine),
 				"RING_CMD_BUF_CCTL"
 			},
+			{
+				i915_mmio_reg_offset(RING_BB_OFFSET(engine->mmio_base)),
+				lrc_ring_bb_offset(engine),
+				"RING_BB_OFFSET"
+			},
 			{ },
 		}, *t;
 		u32 *hw;
-- 
2.20.1


  reply	other threads:[~2022-03-14 18:19 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-14 18:20 [PATCH 0/4] lrc selftest fixes Ramalingam C
2022-03-14 18:20 ` Ramalingam C [this message]
2022-04-08 14:45   ` [Intel-gfx] [PATCH 1/4] drm/i915/gt: Explicitly clear BB_OFFSET for new contexts Thomas Hellström
2022-03-14 18:20 ` [PATCH 2/4] drm/i915/selftests: Check for incomplete LRI from the context image Ramalingam C
2022-04-08 14:38   ` [Intel-gfx] " Thomas Hellström (Intel)
2022-03-14 18:20 ` [PATCH 3/4] drm/i915/selftest: Clear the output buffers before GPU writes Ramalingam C
2022-03-21 23:26   ` [PATCH v2 " Ramalingam C
2022-03-14 18:20 ` [PATCH 4/4] drm/i915/selftest: Always cancel semaphore on error Ramalingam C
2022-04-08 14:43   ` [Intel-gfx] " Thomas Hellström

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