* [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files
@ 2017-06-21 10:59 Maarten Lankhorst
2017-06-21 12:04 ` ✓ Fi.CI.BAT: success for " Patchwork
` (3 more replies)
0 siblings, 4 replies; 7+ messages in thread
From: Maarten Lankhorst @ 2017-06-21 10:59 UTC (permalink / raw)
To: intel-gfx
When reading all debugfs files on a system with DP-MST the kernel panics
on a null pointer dereference because intel_dp is null for a DP-MST
connector. Detect this case and skip those connectors.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 33 ++++++++++++++++++++++++---------
1 file changed, 24 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1f1176b6400e..30e2e168fe92 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3812,13 +3812,18 @@ static int i915_displayport_test_active_show(struct seq_file *m, void *data)
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
+ struct intel_encoder *encoder;
+
if (connector->connector_type !=
DRM_MODE_CONNECTOR_DisplayPort)
continue;
- if (connector->status == connector_status_connected &&
- connector->encoder != NULL) {
- intel_dp = enc_to_intel_dp(connector->encoder);
+ encoder = to_intel_encoder(connector->encoder);
+ if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
+ continue;
+
+ if (encoder && connector->status == connector_status_connected) {
+ intel_dp = enc_to_intel_dp(&encoder->base);
if (intel_dp->compliance.test_active)
seq_puts(m, "1");
else
@@ -3858,13 +3863,18 @@ static int i915_displayport_test_data_show(struct seq_file *m, void *data)
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
+ struct intel_encoder *encoder;
+
if (connector->connector_type !=
DRM_MODE_CONNECTOR_DisplayPort)
continue;
- if (connector->status == connector_status_connected &&
- connector->encoder != NULL) {
- intel_dp = enc_to_intel_dp(connector->encoder);
+ encoder = to_intel_encoder(connector->encoder);
+ if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
+ continue;
+
+ if (encoder && connector->status == connector_status_connected) {
+ intel_dp = enc_to_intel_dp(&encoder->base);
if (intel_dp->compliance.test_type ==
DP_TEST_LINK_EDID_READ)
seq_printf(m, "%lx",
@@ -3911,13 +3921,18 @@ static int i915_displayport_test_type_show(struct seq_file *m, void *data)
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
+ struct intel_encoder *encoder;
+
if (connector->connector_type !=
DRM_MODE_CONNECTOR_DisplayPort)
continue;
- if (connector->status == connector_status_connected &&
- connector->encoder != NULL) {
- intel_dp = enc_to_intel_dp(connector->encoder);
+ encoder = to_intel_encoder(connector->encoder);
+ if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
+ continue;
+
+ if (encoder && connector->status == connector_status_connected) {
+ intel_dp = enc_to_intel_dp(&encoder->base);
seq_printf(m, "%02lx", intel_dp->compliance.test_type);
} else
seq_puts(m, "0");
--
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] 7+ messages in thread* ✓ Fi.CI.BAT: success for drm/i915: Prevent kernel panic on reading out compliance debugfs files
2017-06-21 10:59 [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files Maarten Lankhorst
@ 2017-06-21 12:04 ` Patchwork
2017-06-21 20:57 ` [PATCH] " Pandiyan, Dhinakaran
` (2 subsequent siblings)
3 siblings, 0 replies; 7+ messages in thread
From: Patchwork @ 2017-06-21 12:04 UTC (permalink / raw)
To: Maarten Lankhorst; +Cc: intel-gfx
== Series Details ==
Series: drm/i915: Prevent kernel panic on reading out compliance debugfs files
URL : https://patchwork.freedesktop.org/series/26139/
State : success
== Summary ==
Series 26139v1 drm/i915: Prevent kernel panic on reading out compliance debugfs files
https://patchwork.freedesktop.org/api/1.0/series/26139/revisions/1/mbox/
Test gem_exec_suspend:
Subgroup basic-s4-devices:
dmesg-warn -> PASS (fi-kbl-r) fdo#100125
Test kms_cursor_legacy:
Subgroup basic-busy-flip-before-cursor-atomic:
pass -> FAIL (fi-snb-2600) fdo#100215
fdo#100125 https://bugs.freedesktop.org/show_bug.cgi?id=100125
fdo#100215 https://bugs.freedesktop.org/show_bug.cgi?id=100215
fi-bdw-5557u total:278 pass:267 dwarn:0 dfail:0 fail:0 skip:11 time:443s
fi-bdw-gvtdvm total:278 pass:256 dwarn:8 dfail:0 fail:0 skip:14 time:433s
fi-bsw-n3050 total:278 pass:241 dwarn:1 dfail:0 fail:0 skip:36 time:521s
fi-bxt-j4205 total:278 pass:259 dwarn:0 dfail:0 fail:0 skip:19 time:505s
fi-byt-j1900 total:278 pass:252 dwarn:2 dfail:0 fail:0 skip:24 time:488s
fi-byt-n2820 total:278 pass:248 dwarn:2 dfail:0 fail:0 skip:28 time:481s
fi-glk-2a total:278 pass:259 dwarn:0 dfail:0 fail:0 skip:19 time:586s
fi-hsw-4770 total:278 pass:262 dwarn:0 dfail:0 fail:0 skip:16 time:431s
fi-hsw-4770r total:278 pass:262 dwarn:0 dfail:0 fail:0 skip:16 time:412s
fi-ilk-650 total:278 pass:228 dwarn:0 dfail:0 fail:0 skip:50 time:426s
fi-ivb-3520m total:278 pass:260 dwarn:0 dfail:0 fail:0 skip:18 time:503s
fi-ivb-3770 total:278 pass:260 dwarn:0 dfail:0 fail:0 skip:18 time:472s
fi-kbl-7500u total:278 pass:260 dwarn:0 dfail:0 fail:0 skip:18 time:462s
fi-kbl-7560u total:278 pass:267 dwarn:1 dfail:0 fail:0 skip:10 time:571s
fi-kbl-r total:278 pass:260 dwarn:0 dfail:0 fail:0 skip:18 time:577s
fi-skl-6260u total:278 pass:268 dwarn:0 dfail:0 fail:0 skip:10 time:455s
fi-skl-6700hq total:278 pass:220 dwarn:3 dfail:0 fail:30 skip:24 time:340s
fi-skl-6700k total:278 pass:256 dwarn:4 dfail:0 fail:0 skip:18 time:461s
fi-skl-6770hq total:278 pass:268 dwarn:0 dfail:0 fail:0 skip:10 time:477s
fi-skl-gvtdvm total:278 pass:265 dwarn:0 dfail:0 fail:0 skip:13 time:438s
fi-snb-2520m total:278 pass:250 dwarn:0 dfail:0 fail:0 skip:28 time:539s
fi-snb-2600 total:278 pass:248 dwarn:0 dfail:0 fail:1 skip:29 time:406s
186f6503dc0750d739db5d9301dc9a507eacc6ef drm-tip: 2017y-06m-21d-10h-08m-42s UTC integration manifest
f5bba85 drm/i915: Prevent kernel panic on reading out compliance debugfs files
== Logs ==
For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_5011/
_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files
2017-06-21 10:59 [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files Maarten Lankhorst
2017-06-21 12:04 ` ✓ Fi.CI.BAT: success for " Patchwork
@ 2017-06-21 20:57 ` Pandiyan, Dhinakaran
2017-06-26 8:18 ` [PATCH] drm/i915: Prevent kernel panic when reading/writing compliance debugfs files, v2 Maarten Lankhorst
2017-06-21 22:08 ` [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files Manasi Navare
2017-06-26 11:04 ` ✓ Fi.CI.BAT: success for drm/i915: Prevent kernel panic on reading out compliance debugfs files (rev2) Patchwork
3 siblings, 1 reply; 7+ messages in thread
From: Pandiyan, Dhinakaran @ 2017-06-21 20:57 UTC (permalink / raw)
To: maarten.lankhorst@linux.intel.com; +Cc: intel-gfx@lists.freedesktop.org
On Wed, 2017-06-21 at 12:59 +0200, Maarten Lankhorst wrote:
> When reading all debugfs files on a system with DP-MST the kernel panics
> on a null pointer dereference because intel_dp is null for a DP-MST
> connector. Detect this case and skip those connectors.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 33 ++++++++++++++++++++++++---------
> 1 file changed, 24 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 1f1176b6400e..30e2e168fe92 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
I think you missed i915_displayport_test_active_write(). Looks good
otherwise.
-DK
> @@ -3812,13 +3812,18 @@ static int i915_displayport_test_active_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> if (intel_dp->compliance.test_active)
> seq_puts(m, "1");
> else
> @@ -3858,13 +3863,18 @@ static int i915_displayport_test_data_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> if (intel_dp->compliance.test_type ==
> DP_TEST_LINK_EDID_READ)
> seq_printf(m, "%lx",
> @@ -3911,13 +3921,18 @@ static int i915_displayport_test_type_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> seq_printf(m, "%02lx", intel_dp->compliance.test_type);
> } else
> seq_puts(m, "0");
_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 7+ messages in thread* [PATCH] drm/i915: Prevent kernel panic when reading/writing compliance debugfs files, v2.
2017-06-21 20:57 ` [PATCH] " Pandiyan, Dhinakaran
@ 2017-06-26 8:18 ` Maarten Lankhorst
2017-06-26 17:07 ` Pandiyan, Dhinakaran
0 siblings, 1 reply; 7+ messages in thread
From: Maarten Lankhorst @ 2017-06-26 8:18 UTC (permalink / raw)
To: intel-gfx; +Cc: Dhinakaran Pandiyan
When reading all debugfs files on a system with DP-MST the kernel panics
on a null pointer dereference because intel_dp is null for a DP-MST
connector. Detect this case and skip those connectors.
Also fix the write for the DP compliance file in the same way.
Changes since v1:
- Fix i915_displayport_test_active_write too. (DK)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 44 +++++++++++++++++++++++++++----------
1 file changed, 32 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index f7aa6cbe3a2e..76b07a9b3548 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3778,13 +3778,18 @@ static ssize_t i915_displayport_test_active_write(struct file *file,
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
+ struct intel_encoder *encoder;
+
if (connector->connector_type !=
DRM_MODE_CONNECTOR_DisplayPort)
continue;
- if (connector->status == connector_status_connected &&
- connector->encoder != NULL) {
- intel_dp = enc_to_intel_dp(connector->encoder);
+ encoder = to_intel_encoder(connector->encoder);
+ if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
+ continue;
+
+ if (encoder && connector->status == connector_status_connected) {
+ intel_dp = enc_to_intel_dp(&encoder->base);
status = kstrtoint(input_buffer, 10, &val);
if (status < 0)
break;
@@ -3816,13 +3821,18 @@ static int i915_displayport_test_active_show(struct seq_file *m, void *data)
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
+ struct intel_encoder *encoder;
+
if (connector->connector_type !=
DRM_MODE_CONNECTOR_DisplayPort)
continue;
- if (connector->status == connector_status_connected &&
- connector->encoder != NULL) {
- intel_dp = enc_to_intel_dp(connector->encoder);
+ encoder = to_intel_encoder(connector->encoder);
+ if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
+ continue;
+
+ if (encoder && connector->status == connector_status_connected) {
+ intel_dp = enc_to_intel_dp(&encoder->base);
if (intel_dp->compliance.test_active)
seq_puts(m, "1");
else
@@ -3862,13 +3872,18 @@ static int i915_displayport_test_data_show(struct seq_file *m, void *data)
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
+ struct intel_encoder *encoder;
+
if (connector->connector_type !=
DRM_MODE_CONNECTOR_DisplayPort)
continue;
- if (connector->status == connector_status_connected &&
- connector->encoder != NULL) {
- intel_dp = enc_to_intel_dp(connector->encoder);
+ encoder = to_intel_encoder(connector->encoder);
+ if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
+ continue;
+
+ if (encoder && connector->status == connector_status_connected) {
+ intel_dp = enc_to_intel_dp(&encoder->base);
if (intel_dp->compliance.test_type ==
DP_TEST_LINK_EDID_READ)
seq_printf(m, "%lx",
@@ -3915,13 +3930,18 @@ static int i915_displayport_test_type_show(struct seq_file *m, void *data)
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
+ struct intel_encoder *encoder;
+
if (connector->connector_type !=
DRM_MODE_CONNECTOR_DisplayPort)
continue;
- if (connector->status == connector_status_connected &&
- connector->encoder != NULL) {
- intel_dp = enc_to_intel_dp(connector->encoder);
+ encoder = to_intel_encoder(connector->encoder);
+ if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
+ continue;
+
+ if (encoder && connector->status == connector_status_connected) {
+ intel_dp = enc_to_intel_dp(&encoder->base);
seq_printf(m, "%02lx", intel_dp->compliance.test_type);
} else
seq_puts(m, "0");
--
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] 7+ messages in thread* Re: [PATCH] drm/i915: Prevent kernel panic when reading/writing compliance debugfs files, v2.
2017-06-26 8:18 ` [PATCH] drm/i915: Prevent kernel panic when reading/writing compliance debugfs files, v2 Maarten Lankhorst
@ 2017-06-26 17:07 ` Pandiyan, Dhinakaran
0 siblings, 0 replies; 7+ messages in thread
From: Pandiyan, Dhinakaran @ 2017-06-26 17:07 UTC (permalink / raw)
To: maarten.lankhorst@linux.intel.com; +Cc: intel-gfx@lists.freedesktop.org
On Mon, 2017-06-26 at 10:18 +0200, Maarten Lankhorst wrote:
> When reading all debugfs files on a system with DP-MST the kernel panics
> on a null pointer dereference because intel_dp is null for a DP-MST
> connector. Detect this case and skip those connectors.
>
> Also fix the write for the DP compliance file in the same way.
>
> Changes since v1:
> - Fix i915_displayport_test_active_write too. (DK)
>
Avoids NULL pointer dereferences in all instances of enc_to_intel_dp()
inside compliance related functions, so
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
This is the second instance where enc_to_intel_dp(mst_encoder) has
caused kernel panics. I wonder if we should change enc_to_intel_dp() to
check for encoder type.
-DK
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> Cc: Manasi Navare <manasi.d.navare@intel.com>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 44 +++++++++++++++++++++++++++----------
> 1 file changed, 32 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index f7aa6cbe3a2e..76b07a9b3548 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -3778,13 +3778,18 @@ static ssize_t i915_displayport_test_active_write(struct file *file,
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> status = kstrtoint(input_buffer, 10, &val);
> if (status < 0)
> break;
> @@ -3816,13 +3821,18 @@ static int i915_displayport_test_active_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> if (intel_dp->compliance.test_active)
> seq_puts(m, "1");
> else
> @@ -3862,13 +3872,18 @@ static int i915_displayport_test_data_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> if (intel_dp->compliance.test_type ==
> DP_TEST_LINK_EDID_READ)
> seq_printf(m, "%lx",
> @@ -3915,13 +3930,18 @@ static int i915_displayport_test_type_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> seq_printf(m, "%02lx", intel_dp->compliance.test_type);
> } else
> seq_puts(m, "0");
_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files
2017-06-21 10:59 [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files Maarten Lankhorst
2017-06-21 12:04 ` ✓ Fi.CI.BAT: success for " Patchwork
2017-06-21 20:57 ` [PATCH] " Pandiyan, Dhinakaran
@ 2017-06-21 22:08 ` Manasi Navare
2017-06-26 11:04 ` ✓ Fi.CI.BAT: success for drm/i915: Prevent kernel panic on reading out compliance debugfs files (rev2) Patchwork
3 siblings, 0 replies; 7+ messages in thread
From: Manasi Navare @ 2017-06-21 22:08 UTC (permalink / raw)
To: Maarten Lankhorst; +Cc: intel-gfx
Thanks fo rthis patch Maarten. I had noticed this while running the intel_dp_compliance
IGT tool. But I saw this with DP SST systems as well. What could be happening in that case?
Manasi
On Wed, Jun 21, 2017 at 12:59:41PM +0200, Maarten Lankhorst wrote:
> When reading all debugfs files on a system with DP-MST the kernel panics
> on a null pointer dereference because intel_dp is null for a DP-MST
> connector. Detect this case and skip those connectors.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 33 ++++++++++++++++++++++++---------
> 1 file changed, 24 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 1f1176b6400e..30e2e168fe92 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -3812,13 +3812,18 @@ static int i915_displayport_test_active_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> if (intel_dp->compliance.test_active)
> seq_puts(m, "1");
> else
> @@ -3858,13 +3863,18 @@ static int i915_displayport_test_data_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> if (intel_dp->compliance.test_type ==
> DP_TEST_LINK_EDID_READ)
> seq_printf(m, "%lx",
> @@ -3911,13 +3921,18 @@ static int i915_displayport_test_type_show(struct seq_file *m, void *data)
>
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(connector, &conn_iter) {
> + struct intel_encoder *encoder;
> +
> if (connector->connector_type !=
> DRM_MODE_CONNECTOR_DisplayPort)
> continue;
>
> - if (connector->status == connector_status_connected &&
> - connector->encoder != NULL) {
> - intel_dp = enc_to_intel_dp(connector->encoder);
> + encoder = to_intel_encoder(connector->encoder);
> + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST)
> + continue;
> +
> + if (encoder && connector->status == connector_status_connected) {
> + intel_dp = enc_to_intel_dp(&encoder->base);
> seq_printf(m, "%02lx", intel_dp->compliance.test_type);
> } else
> seq_puts(m, "0");
> --
> 2.11.0
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
_______________________________________________
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^ permalink raw reply [flat|nested] 7+ messages in thread* ✓ Fi.CI.BAT: success for drm/i915: Prevent kernel panic on reading out compliance debugfs files (rev2)
2017-06-21 10:59 [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files Maarten Lankhorst
` (2 preceding siblings ...)
2017-06-21 22:08 ` [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files Manasi Navare
@ 2017-06-26 11:04 ` Patchwork
3 siblings, 0 replies; 7+ messages in thread
From: Patchwork @ 2017-06-26 11:04 UTC (permalink / raw)
To: Maarten Lankhorst; +Cc: intel-gfx
== Series Details ==
Series: drm/i915: Prevent kernel panic on reading out compliance debugfs files (rev2)
URL : https://patchwork.freedesktop.org/series/26139/
State : success
== Summary ==
Series 26139v2 drm/i915: Prevent kernel panic on reading out compliance debugfs files
https://patchwork.freedesktop.org/api/1.0/series/26139/revisions/2/mbox/
Test gem_exec_suspend:
Subgroup basic-s4-devices:
dmesg-warn -> PASS (fi-kbl-7560u) fdo#100125
Test kms_flip:
Subgroup basic-flip-vs-wf_vblank:
fail -> PASS (fi-blb-e6850) fdo#99093 +2
Test kms_pipe_crc_basic:
Subgroup suspend-read-crc-pipe-a:
dmesg-warn -> PASS (fi-byt-j1900) fdo#101517
fdo#100125 https://bugs.freedesktop.org/show_bug.cgi?id=100125
fdo#99093 https://bugs.freedesktop.org/show_bug.cgi?id=99093
fdo#101517 https://bugs.freedesktop.org/show_bug.cgi?id=101517
fi-bdw-5557u total:279 pass:268 dwarn:0 dfail:0 fail:0 skip:11 time:440s
fi-bdw-gvtdvm total:279 pass:257 dwarn:8 dfail:0 fail:0 skip:14 time:436s
fi-blb-e6850 total:279 pass:224 dwarn:1 dfail:0 fail:0 skip:54 time:365s
fi-bsw-n3050 total:279 pass:242 dwarn:1 dfail:0 fail:0 skip:36 time:525s
fi-bxt-j4205 total:279 pass:260 dwarn:0 dfail:0 fail:0 skip:19 time:506s
fi-byt-j1900 total:279 pass:254 dwarn:1 dfail:0 fail:0 skip:24 time:491s
fi-byt-n2820 total:279 pass:249 dwarn:2 dfail:0 fail:0 skip:28 time:482s
fi-glk-2a total:279 pass:260 dwarn:0 dfail:0 fail:0 skip:19 time:596s
fi-hsw-4770 total:279 pass:263 dwarn:0 dfail:0 fail:0 skip:16 time:435s
fi-hsw-4770r total:279 pass:263 dwarn:0 dfail:0 fail:0 skip:16 time:416s
fi-ilk-650 total:279 pass:229 dwarn:0 dfail:0 fail:0 skip:50 time:421s
fi-ivb-3520m total:279 pass:261 dwarn:0 dfail:0 fail:0 skip:18 time:492s
fi-ivb-3770 total:279 pass:261 dwarn:0 dfail:0 fail:0 skip:18 time:470s
fi-kbl-7500u total:279 pass:261 dwarn:0 dfail:0 fail:0 skip:18 time:469s
fi-kbl-7560u total:279 pass:269 dwarn:0 dfail:0 fail:0 skip:10 time:569s
fi-kbl-r total:279 pass:260 dwarn:1 dfail:0 fail:0 skip:18 time:574s
fi-pnv-d510 total:279 pass:223 dwarn:1 dfail:0 fail:0 skip:55 time:553s
fi-skl-6260u total:279 pass:269 dwarn:0 dfail:0 fail:0 skip:10 time:460s
fi-skl-6700hq total:279 pass:223 dwarn:1 dfail:0 fail:30 skip:24 time:339s
fi-skl-6700k total:279 pass:257 dwarn:4 dfail:0 fail:0 skip:18 time:473s
fi-skl-6770hq total:279 pass:269 dwarn:0 dfail:0 fail:0 skip:10 time:473s
fi-skl-gvtdvm total:279 pass:266 dwarn:0 dfail:0 fail:0 skip:13 time:441s
fi-snb-2520m total:279 pass:251 dwarn:0 dfail:0 fail:0 skip:28 time:544s
fi-snb-2600 total:279 pass:250 dwarn:0 dfail:0 fail:0 skip:29 time:407s
21d74e215ad650f0e8e30de609bd65601f0aa11d drm-tip: 2017y-06m-26d-09h-12m-14s UTC integration manifest
0211dae drm/i915: Prevent kernel panic when reading/writing compliance debugfs files, v2.
== Logs ==
For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_5040/
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^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2017-06-26 17:08 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-06-21 10:59 [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files Maarten Lankhorst
2017-06-21 12:04 ` ✓ Fi.CI.BAT: success for " Patchwork
2017-06-21 20:57 ` [PATCH] " Pandiyan, Dhinakaran
2017-06-26 8:18 ` [PATCH] drm/i915: Prevent kernel panic when reading/writing compliance debugfs files, v2 Maarten Lankhorst
2017-06-26 17:07 ` Pandiyan, Dhinakaran
2017-06-21 22:08 ` [PATCH] drm/i915: Prevent kernel panic on reading out compliance debugfs files Manasi Navare
2017-06-26 11:04 ` ✓ Fi.CI.BAT: success for drm/i915: Prevent kernel panic on reading out compliance debugfs files (rev2) Patchwork
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