[CI 1/2] drm/i915: Add struct_mutex locking for debugs/i915_gem_framebuffer

[CI 1/2] drm/i915: Add struct_mutex locking for debugs/i915_gem_framebuffer

[Chris Wilson]

Since describe_obj() looks at state guarded by the struct_mutex, we need
to be holding it.

[  580.201054] drv_suspend: starting subtest debugfs-reader
[  580.239652] ------------[ cut here ]------------
[  580.239696] WARNING: CPU: 0 PID: 920 at include/linux/list_check.h:25 describe_obj+0x419/0x440()
[  580.239725] CPU: 0 PID: 920 Comm: cat Not tainted 4.5.0-rc6+ #835
[  580.239745] Hardware name:                  /NUC5CPYB, BIOS PYBSWCEL.86A.0027.2015.0507.1758 05/07/2015
[  580.239767]  0000000000000000 ffff88027554fcf8 ffffffff812c1135 0000000000000000
[  580.239815]  ffffffff8193dc42 ffff88027554fd30 ffffffff8107419d ffff880071727c00
[  580.239858]  ffff8802757d8000 ffffffff818f693c ffffffff818f693c ffff8802757b9048
[  580.239896] Call Trace:
[  580.239917]  [<ffffffff812c1135>] dump_stack+0x67/0x92
[  580.239939]  [<ffffffff8107419d>] warn_slowpath_common+0x7d/0xb0
[  580.239959]  [<ffffffff810742ba>] warn_slowpath_null+0x1a/0x20
[  580.239981]  [<ffffffff813ce579>] describe_obj+0x419/0x440
[  580.240006]  [<ffffffff813ced22>] i915_gem_framebuffer_info+0xa2/0x100
[  580.240033]  [<ffffffff811a9286>] seq_read+0xe6/0x3b0
[  580.240059]  [<ffffffff81182288>] __vfs_read+0x28/0xd0
[  580.240085]  [<ffffffff81173378>] ? SyS_fadvise64+0x228/0x2c0
[  580.240112]  [<ffffffff811823b2>] vfs_read+0x82/0x110
[  580.240137]  [<ffffffff811827d9>] SyS_read+0x49/0xa0
[  580.240162]  [<ffffffff815bac57>] entry_SYSCALL_64_fastpath+0x12/0x6b
[  580.240187] ---[ end trace 3e2cbf34576c9878 ]---
[  580.281900] ------------[ cut here ]------------

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 74f227415765..6b384d7738f1 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -134,6 +134,8 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
 	int pin_count = 0;
 	enum intel_engine_id id;
 
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	seq_printf(m, "%pK: %s%s%s%s %8zdKiB %02x %02x [ ",
 		   &obj->base,
 		   obj->active ? "*" : " ",
@@ -1894,6 +1896,11 @@ static int i915_gem_framebuffer_info(struct seq_file *m, void *data)
 	struct drm_device *dev = node->minor->dev;
 	struct intel_framebuffer *fbdev_fb = NULL;
 	struct drm_framebuffer *drm_fb;
+	int ret;
+
+	ret = mutex_lock_interruptible(&dev->struct_mutex);
+	if (ret)
+		return ret;
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION
        if (to_i915(dev)->fbdev) {
@@ -1928,6 +1935,7 @@ static int i915_gem_framebuffer_info(struct seq_file *m, void *data)
 		seq_putc(m, '\n');
 	}
 	mutex_unlock(&dev->mode_config.fb_lock);
+	mutex_unlock(&dev->struct_mutex);
 
 	return 0;
 }
-- 
2.8.0.rc3

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[CI 2/2] drm/i915: Show PCI power state under debugfs/i915_runtime_pm_status

[Chris Wilson]

As the current PCI power state is an essential feature of runtime pm,
include it in the debugfs/i915_runtime_pm_status.

v2: Use pci_power_name()

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 6b384d7738f1..0b25228c202e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2694,10 +2694,8 @@ static int i915_runtime_pm_status(struct seq_file *m, void *unused)
 	struct drm_device *dev = node->minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	if (!HAS_RUNTIME_PM(dev)) {
-		seq_puts(m, "not supported\n");
-		return 0;
-	}
+	if (!HAS_RUNTIME_PM(dev_priv))
+		seq_puts(m, "Runtime power management not supported\n");
 
 	seq_printf(m, "GPU idle: %s\n", yesno(!dev_priv->mm.busy));
 	seq_printf(m, "IRQs disabled: %s\n",
@@ -2708,6 +2706,9 @@ static int i915_runtime_pm_status(struct seq_file *m, void *unused)
 #else
 	seq_printf(m, "Device Power Management (CONFIG_PM) disabled\n");
 #endif
+	seq_printf(m, "PCI device power state: %s [%d]\n",
+		   pci_power_name(dev_priv->dev->pdev->current_state),
+		   dev_priv->dev->pdev->current_state);
 
 	return 0;
 }
-- 
2.8.0.rc3

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✓ Fi.CI.BAT: success for series starting with [CI,1/2] drm/i915: Add struct_mutex locking for debugs/i915_gem_framebuffer

[Patchwork]

== Series Details ==

Series: series starting with [CI,1/2] drm/i915: Add struct_mutex locking for debugs/i915_gem_framebuffer
URL   : https://patchwork.freedesktop.org/series/5235/
State : success

== Summary ==

Series 5235v1 Series without cover letter
http://patchwork.freedesktop.org/api/1.0/series/5235/revisions/1/mbox/

Test kms_flip:
        Subgroup basic-flip-vs-wf_vblank:
                fail       -> PASS       (snb-x220t)
                fail       -> PASS       (ilk-hp8440p) UNSTABLE
Test kms_force_connector_basic:
        Subgroup force-connector-state:
                pass       -> SKIP       (ivb-t430s)
        Subgroup force-edid:
                pass       -> SKIP       (ivb-t430s)

bdw-nuci7        total:196  pass:184  dwarn:0   dfail:0   fail:0   skip:12 
bdw-ultra        total:196  pass:175  dwarn:0   dfail:0   fail:0   skip:21 
bsw-nuc-2        total:196  pass:159  dwarn:0   dfail:0   fail:0   skip:37 
byt-nuc          total:196  pass:161  dwarn:0   dfail:0   fail:0   skip:35 
hsw-brixbox      total:196  pass:174  dwarn:0   dfail:0   fail:0   skip:22 
hsw-gt2          total:17   pass:13   dwarn:0   dfail:0   fail:0   skip:3  
ilk-hp8440p      total:196  pass:132  dwarn:0   dfail:0   fail:0   skip:64 
ivb-t430s        total:196  pass:169  dwarn:0   dfail:0   fail:0   skip:27 
snb-dellxps      total:196  pass:162  dwarn:0   dfail:0   fail:0   skip:34 
snb-x220t        total:196  pass:162  dwarn:0   dfail:0   fail:1   skip:33 

Results at /archive/results/CI_IGT_test/Patchwork_1782/

ce3f49e2a53a54308ed171613c2567f04fab8228 drm-intel-nightly: 2016y-04m-01d-20h-30m-13s UTC integration manifest
bf7969308eb88942dab4eceaf91aa8c317468875 drm/i915: Show PCI power state under debugfs/i915_runtime_pm_status
e35f64aba51dc5c4b6a70abd41f263227c7b5ffa drm/i915: Add struct_mutex locking for debugs/i915_gem_framebuffer

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