* [CI] drm/i915: Use fallback forcewake if primary ack missing
@ 2017-11-02 9:48 Mika Kuoppala
2017-11-02 10:30 ` ✓ Fi.CI.BAT: success for " Patchwork
2017-11-02 11:16 ` ✗ Fi.CI.IGT: warning " Patchwork
0 siblings, 2 replies; 3+ messages in thread
From: Mika Kuoppala @ 2017-11-02 9:48 UTC (permalink / raw)
To: intel-gfx; +Cc: Rodrigo Vivi
There is a possibility on gen9 hardware to miss the forcewake ack
message. The recommended workaround is to use another free
bit and toggle it until original bit is successfully acknowledged.
Some future gen9 revs might or might not fix the underlying issue but
using fallback forcewake bit dance can be considered as harmless:
without the ack timeout we never reach the fallback bit forcewake.
Thus as of now we adopt a blanket approach for all gen9 and leave
the bypassing the fallback bit approach for future patches if
corresponding hw revisions do appear.
Commit 83e3337204b2 ("drm/i915: Increase maximum polling time to 50ms
for forcewake request/clear ack") did increase the forcewake timeout.
If the issue was a delayed ack, future work could include finding
a suitable timeout value both for primary ack and reserve toggle
to reduce the worst case latency.
v2: use bit 15, naming, comment (Chris), only wait fallback ack
v3: fix return on fallback, backoff after fallback write (Chris)
v4: udelay on first pass, grammar (Chris)
v4: s/reserve/fallback
References: HSDES #1604254524
References: https://bugs.freedesktop.org/show_bug.cgi?id=102051
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_reg.h | 5 +-
drivers/gpu/drm/i915/intel_uncore.c | 137 +++++++++++++++++++++++++++++++++---
2 files changed, 130 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8c775e96b4e4..f0f8f6059652 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7774,8 +7774,9 @@ enum {
#define FORCEWAKE_ACK_MEDIA_GEN9 _MMIO(0x0D88)
#define FORCEWAKE_ACK_RENDER_GEN9 _MMIO(0x0D84)
#define FORCEWAKE_ACK_BLITTER_GEN9 _MMIO(0x130044)
-#define FORCEWAKE_KERNEL 0x1
-#define FORCEWAKE_USER 0x2
+#define FORCEWAKE_KERNEL BIT(0)
+#define FORCEWAKE_USER BIT(1)
+#define FORCEWAKE_KERNEL_FALLBACK BIT(15)
#define FORCEWAKE_MT_ACK _MMIO(0x130040)
#define ECOBUS _MMIO(0xa180)
#define FORCEWAKE_MT_ENABLE (1<<5)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 0564d87ad416..0a6d952a2df1 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -69,17 +69,104 @@ fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d)
HRTIMER_MODE_REL);
}
+static inline int
+__wait_for_ack(const struct drm_i915_private *i915,
+ const struct intel_uncore_forcewake_domain *d,
+ const u32 ack,
+ const u32 value)
+{
+ return wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) & ack) == value,
+ FORCEWAKE_ACK_TIMEOUT_MS);
+}
+
+static inline int
+wait_ack_clear(const struct drm_i915_private *i915,
+ const struct intel_uncore_forcewake_domain *d,
+ const u32 ack)
+{
+ return __wait_for_ack(i915, d, ack, 0);
+}
+
+static inline int
+wait_ack_set(const struct drm_i915_private *i915,
+ const struct intel_uncore_forcewake_domain *d,
+ const u32 ack)
+{
+ return __wait_for_ack(i915, d, ack, ack);
+}
+
static inline void
fw_domain_wait_ack_clear(const struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
{
- if (wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) &
- FORCEWAKE_KERNEL) == 0,
- FORCEWAKE_ACK_TIMEOUT_MS))
+ if (wait_ack_clear(i915, d, FORCEWAKE_KERNEL))
DRM_ERROR("%s: timed out waiting for forcewake ack to clear.\n",
intel_uncore_forcewake_domain_to_str(d->id));
}
+enum ack_type {
+ ACK_CLEAR = 0,
+ ACK_SET
+};
+
+static int
+fw_domain_wait_ack_with_fallback(const struct drm_i915_private *i915,
+ const struct intel_uncore_forcewake_domain *d,
+ const enum ack_type type)
+{
+ const u32 ack_bit = FORCEWAKE_KERNEL;
+ const u32 value = type == ACK_SET ? ack_bit : 0;
+ unsigned int pass;
+ bool ack_detected;
+
+ /*
+ * There is a possibility of driver's wake request colliding
+ * with hardware's own wake requests and that can cause
+ * hardware to not deliver the driver's ack message.
+ *
+ * Use a fallback bit toggle to kick the gpu state machine
+ * in the hope that the original ack will be delivered along with
+ * the fallback ack.
+ *
+ * This workaround is described in HSDES #1604254524
+ */
+
+ pass = 1;
+ do {
+ wait_ack_clear(i915, d, FORCEWAKE_KERNEL_FALLBACK);
+
+ __raw_i915_write32(i915, d->reg_set,
+ _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL_FALLBACK));
+ /* Give gt some time to relax before the polling frenzy */
+ udelay(10 * pass);
+ wait_ack_set(i915, d, FORCEWAKE_KERNEL_FALLBACK);
+
+ ack_detected = (__raw_i915_read32(i915, d->reg_ack) & ack_bit) == value;
+
+ __raw_i915_write32(i915, d->reg_set,
+ _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL_FALLBACK));
+ } while (!ack_detected && pass++ < 10);
+
+ DRM_DEBUG_DRIVER("%s had to use fallback to %s ack, 0x%x (passes %u)\n",
+ intel_uncore_forcewake_domain_to_str(d->id),
+ type == ACK_SET ? "set" : "clear",
+ __raw_i915_read32(i915, d->reg_ack),
+ pass);
+
+ return ack_detected ? 0 : -ETIMEDOUT;
+}
+
+static inline void
+fw_domain_wait_ack_clear_fallback(const struct drm_i915_private *i915,
+ const struct intel_uncore_forcewake_domain *d)
+{
+ if (likely(!wait_ack_clear(i915, d, FORCEWAKE_KERNEL)))
+ return;
+
+ if (fw_domain_wait_ack_with_fallback(i915, d, ACK_CLEAR))
+ fw_domain_wait_ack_clear(i915, d);
+}
+
static inline void
fw_domain_get(struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
@@ -88,17 +175,26 @@ fw_domain_get(struct drm_i915_private *i915,
}
static inline void
-fw_domain_wait_ack(const struct drm_i915_private *i915,
- const struct intel_uncore_forcewake_domain *d)
+fw_domain_wait_ack_set(const struct drm_i915_private *i915,
+ const struct intel_uncore_forcewake_domain *d)
{
- if (wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) &
- FORCEWAKE_KERNEL),
- FORCEWAKE_ACK_TIMEOUT_MS))
+ if (wait_ack_set(i915, d, FORCEWAKE_KERNEL))
DRM_ERROR("%s: timed out waiting for forcewake ack request.\n",
intel_uncore_forcewake_domain_to_str(d->id));
}
static inline void
+fw_domain_wait_ack_set_fallback(const struct drm_i915_private *i915,
+ const struct intel_uncore_forcewake_domain *d)
+{
+ if (likely(!wait_ack_set(i915, d, FORCEWAKE_KERNEL)))
+ return;
+
+ if (fw_domain_wait_ack_with_fallback(i915, d, ACK_SET))
+ fw_domain_wait_ack_set(i915, d);
+}
+
+static inline void
fw_domain_put(const struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
{
@@ -119,7 +215,27 @@ fw_domains_get(struct drm_i915_private *i915, enum forcewake_domains fw_domains)
}
for_each_fw_domain_masked(d, fw_domains, i915, tmp)
- fw_domain_wait_ack(i915, d);
+ fw_domain_wait_ack_set(i915, d);
+
+ i915->uncore.fw_domains_active |= fw_domains;
+}
+
+static void
+fw_domains_get_with_fallback(struct drm_i915_private *i915,
+ enum forcewake_domains fw_domains)
+{
+ struct intel_uncore_forcewake_domain *d;
+ unsigned int tmp;
+
+ GEM_BUG_ON(fw_domains & ~i915->uncore.fw_domains);
+
+ for_each_fw_domain_masked(d, fw_domains, i915, tmp) {
+ fw_domain_wait_ack_clear_fallback(i915, d);
+ fw_domain_get(i915, d);
+ }
+
+ for_each_fw_domain_masked(d, fw_domains, i915, tmp)
+ fw_domain_wait_ack_set_fallback(i915, d);
i915->uncore.fw_domains_active |= fw_domains;
}
@@ -1142,7 +1258,8 @@ static void intel_uncore_fw_domains_init(struct drm_i915_private *dev_priv)
}
if (INTEL_GEN(dev_priv) >= 9) {
- dev_priv->uncore.funcs.force_wake_get = fw_domains_get;
+ dev_priv->uncore.funcs.force_wake_get =
+ fw_domains_get_with_fallback;
dev_priv->uncore.funcs.force_wake_put = fw_domains_put;
fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
FORCEWAKE_RENDER_GEN9,
--
2.11.0
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply related [flat|nested] 3+ messages in thread
* ✓ Fi.CI.BAT: success for drm/i915: Use fallback forcewake if primary ack missing
2017-11-02 9:48 [CI] drm/i915: Use fallback forcewake if primary ack missing Mika Kuoppala
@ 2017-11-02 10:30 ` Patchwork
2017-11-02 11:16 ` ✗ Fi.CI.IGT: warning " Patchwork
1 sibling, 0 replies; 3+ messages in thread
From: Patchwork @ 2017-11-02 10:30 UTC (permalink / raw)
To: Mika Kuoppala; +Cc: intel-gfx
== Series Details ==
Series: drm/i915: Use fallback forcewake if primary ack missing
URL : https://patchwork.freedesktop.org/series/33035/
State : success
== Summary ==
Series 33035v1 drm/i915: Use fallback forcewake if primary ack missing
https://patchwork.freedesktop.org/api/1.0/series/33035/revisions/1/mbox/
Test gem_exec_reloc:
Subgroup basic-cpu-active:
fail -> PASS (fi-gdg-551) fdo#102582 +1
Test kms_cursor_legacy:
Subgroup basic-busy-flip-before-cursor-legacy:
pass -> FAIL (fi-gdg-551) fdo#102618
Test kms_frontbuffer_tracking:
Subgroup basic:
dmesg-warn -> PASS (fi-bdw-5557u) fdo#102473
fdo#102582 https://bugs.freedesktop.org/show_bug.cgi?id=102582
fdo#102618 https://bugs.freedesktop.org/show_bug.cgi?id=102618
fdo#102473 https://bugs.freedesktop.org/show_bug.cgi?id=102473
fi-bdw-5557u total:289 pass:268 dwarn:0 dfail:0 fail:0 skip:21 time:444s
fi-bdw-gvtdvm total:289 pass:265 dwarn:0 dfail:0 fail:0 skip:24 time:455s
fi-blb-e6850 total:289 pass:223 dwarn:1 dfail:0 fail:0 skip:65 time:377s
fi-bsw-n3050 total:289 pass:243 dwarn:0 dfail:0 fail:0 skip:46 time:542s
fi-bwr-2160 total:289 pass:183 dwarn:0 dfail:0 fail:0 skip:106 time:277s
fi-bxt-dsi total:289 pass:259 dwarn:0 dfail:0 fail:0 skip:30 time:509s
fi-bxt-j4205 total:289 pass:260 dwarn:0 dfail:0 fail:0 skip:29 time:503s
fi-byt-j1900 total:289 pass:253 dwarn:1 dfail:0 fail:0 skip:35 time:507s
fi-byt-n2820 total:289 pass:249 dwarn:1 dfail:0 fail:0 skip:39 time:489s
fi-cfl-s total:289 pass:253 dwarn:4 dfail:0 fail:0 skip:32 time:549s
fi-cnl-y total:217 pass:196 dwarn:0 dfail:0 fail:0 skip:20
fi-elk-e7500 total:289 pass:229 dwarn:0 dfail:0 fail:0 skip:60 time:425s
fi-gdg-551 total:289 pass:177 dwarn:1 dfail:0 fail:2 skip:109 time:269s
fi-glk-1 total:289 pass:261 dwarn:0 dfail:0 fail:0 skip:28 time:580s
fi-glk-dsi total:289 pass:258 dwarn:0 dfail:0 fail:1 skip:30 time:489s
fi-hsw-4770 total:289 pass:262 dwarn:0 dfail:0 fail:0 skip:27 time:436s
fi-hsw-4770r total:289 pass:262 dwarn:0 dfail:0 fail:0 skip:27 time:427s
fi-ilk-650 total:289 pass:228 dwarn:0 dfail:0 fail:0 skip:61 time:429s
fi-ivb-3520m total:289 pass:260 dwarn:0 dfail:0 fail:0 skip:29 time:498s
fi-ivb-3770 total:289 pass:260 dwarn:0 dfail:0 fail:0 skip:29 time:463s
fi-kbl-7500u total:289 pass:264 dwarn:1 dfail:0 fail:0 skip:24 time:495s
fi-kbl-7560u total:289 pass:270 dwarn:0 dfail:0 fail:0 skip:19 time:573s
fi-kbl-7567u total:289 pass:269 dwarn:0 dfail:0 fail:0 skip:20 time:477s
fi-kbl-r total:289 pass:262 dwarn:0 dfail:0 fail:0 skip:27 time:588s
fi-pnv-d510 total:289 pass:222 dwarn:1 dfail:0 fail:0 skip:66 time:571s
fi-skl-6260u total:289 pass:269 dwarn:0 dfail:0 fail:0 skip:20 time:448s
fi-skl-6600u total:289 pass:262 dwarn:0 dfail:0 fail:0 skip:27 time:594s
fi-skl-6700hq total:289 pass:263 dwarn:0 dfail:0 fail:0 skip:26 time:653s
fi-skl-6700k total:289 pass:265 dwarn:0 dfail:0 fail:0 skip:24 time:521s
fi-skl-6770hq total:289 pass:269 dwarn:0 dfail:0 fail:0 skip:20 time:501s
fi-skl-gvtdvm total:289 pass:266 dwarn:0 dfail:0 fail:0 skip:23 time:460s
fi-snb-2520m total:289 pass:250 dwarn:0 dfail:0 fail:0 skip:39 time:572s
fi-snb-2600 total:289 pass:249 dwarn:0 dfail:0 fail:0 skip:40 time:423s
dcf7d008f606b543fef53609a6e336097e6b5694 drm-tip: 2017y-11m-02d-08h-43m-13s UTC integration manifest
abc26b3f0b34 drm/i915: Use fallback forcewake if primary ack missing
== Logs ==
For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_6920/
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https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 3+ messages in thread
* ✗ Fi.CI.IGT: warning for drm/i915: Use fallback forcewake if primary ack missing
2017-11-02 9:48 [CI] drm/i915: Use fallback forcewake if primary ack missing Mika Kuoppala
2017-11-02 10:30 ` ✓ Fi.CI.BAT: success for " Patchwork
@ 2017-11-02 11:16 ` Patchwork
1 sibling, 0 replies; 3+ messages in thread
From: Patchwork @ 2017-11-02 11:16 UTC (permalink / raw)
To: Mika Kuoppala; +Cc: intel-gfx
== Series Details ==
Series: drm/i915: Use fallback forcewake if primary ack missing
URL : https://patchwork.freedesktop.org/series/33035/
State : warning
== Summary ==
Test kms_cursor_crc:
Subgroup cursor-64x21-random:
pass -> SKIP (shard-hsw)
Test kms_flip:
Subgroup flip-vs-fences:
pass -> SKIP (shard-hsw)
Subgroup wf_vblank-vs-dpms-interruptible:
skip -> PASS (shard-hsw) fdo#102614
Test kms_frontbuffer_tracking:
Subgroup fbc-1p-primscrn-cur-indfb-draw-blt:
skip -> PASS (shard-hsw)
Subgroup fbc-1p-primscrn-pri-shrfb-draw-blt:
skip -> PASS (shard-hsw)
Test kms_atomic_transition:
Subgroup plane-all-transition-fencing:
skip -> PASS (shard-hsw)
Subgroup plane-all-modeset-transition:
skip -> PASS (shard-hsw)
fdo#102614 https://bugs.freedesktop.org/show_bug.cgi?id=102614
shard-hsw total:2539 pass:1429 dwarn:2 dfail:0 fail:9 skip:1099 time:9411s
== Logs ==
For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_6920/shards.html
_______________________________________________
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-11-02 9:48 [CI] drm/i915: Use fallback forcewake if primary ack missing Mika Kuoppala
2017-11-02 10:30 ` ✓ Fi.CI.BAT: success for " Patchwork
2017-11-02 11:16 ` ✗ Fi.CI.IGT: warning " Patchwork
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