From cf632bd6c6e937a2e98f523d25891f511084647a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 13 Mar 2017 09:56:17 +0000 Subject: [PATCH] drm/i915: Extend rpm wakelock for debugfs/i915_drpc_info i915_drpc_info missed covering a few register read with the runtime pm wakelock. Be simple and cover the entire function with a single wakelock so that new additions are not similarly missed in future. WARNING: CPU: 2 PID: 1334 at drivers/gpu/drm/i915/intel_drv.h:1743 gen6_read32+0x192/0x1e0 [i915] RPM wakelock ref not held during HW access Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver netconsole nfsd auth_rpcgss ipmi_watchdog ipmi_poweroff ipmi_devintf ipmi_msghandler overlay btrfs xor raid6_pq dm_mod sg sd_mod snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic ata_generic pata_acpi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_intel kvm_intel snd_hda_codec kvm eeepc_wmi irqbypass snd_hda_core crct10dif_pclmul crc32_pclmul crc32c_intel asus_wmi sparse_keymap ghash_clmulni_intel snd_hwdep i915 rfkill ppdev pcbc aesni_intel ata_piix crypto_simd glue_helper snd_pcm pata_via cryptd pcspkr snd_timer drm_kms_helper syscopyarea snd sysfillrect libata sysimgblt fb_sys_fops soundcore shpchp drm wmi parport_pc parport tpm_infineon video CPU: 2 PID: 1334 Comm: php5 Not tainted 4.10.0-rc8-01615-g1f58c8e #1 Hardware name: System manufacturer System Product Name/P8H67-M PRO, BIOS 1002 04/01/2011 Call Trace: dump_stack+0x63/0x8a __warn+0xcb/0xf0 warn_slowpath_fmt+0x4f/0x60 ? seq_vprintf+0x35/0x50 gen6_read32+0x192/0x1e0 [i915] i915_drpc_info+0x55d/0x990 [i915] seq_read+0xf2/0x3b0 full_proxy_read+0x51/0x80 __vfs_read+0x28/0x130 ? security_file_permission+0x9b/0xc0 ? rw_verify_area+0x4e/0xb0 vfs_read+0xa8/0x170 SyS_read+0x46/0xa0 entry_SYSCALL_64_fastpath+0x1a/0xa9 RIP: 0033:0x7fd97bf175a0 RSP: 002b:00007ffdf730db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fd978028738 RCX: 00007fd97bf175a0 RDX: 0000000000002000 RSI: 00007fd97740e0d8 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000e97840 R09: 00007fd977ef8d58 R10: 0000000000000027 R11: 0000000000000246 R12: 00007fd977ef8d58 R13: 0000000000000000 R14: 0000000000eb4640 R15: 0000000000000000 Reported-by: kernel test robot Signed-off-by: Chris Wilson Link: http://patchwork.freedesktop.org/patch/msgid/20170313095617.29010-1-chris@chris-wilson.co.uk Reviewed-by: Mika Kuoppala --- drivers/gpu/drm/i915/i915_debugfs.c | 38 ++++++++++------------------- 1 file changed, 13 insertions(+), 25 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 82fb005a5e22..a0c69f4a9652 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1394,14 +1394,10 @@ static int ironlake_drpc_info(struct seq_file *m) u32 rgvmodectl, rstdbyctl; u16 crstandvid; - intel_runtime_pm_get(dev_priv); - rgvmodectl = I915_READ(MEMMODECTL); rstdbyctl = I915_READ(RSTDBYCTL); crstandvid = I915_READ16(CRSTANDVID); - intel_runtime_pm_put(dev_priv); - seq_printf(m, "HD boost: %s\n", yesno(rgvmodectl & MEMMODE_BOOST_EN)); seq_printf(m, "Boost freq: %d\n", (rgvmodectl & MEMMODE_BOOST_FREQ_MASK) >> @@ -1470,14 +1466,10 @@ static int vlv_drpc_info(struct seq_file *m) struct drm_i915_private *dev_priv = node_to_i915(m->private); u32 rpmodectl1, rcctl1, pw_status; - intel_runtime_pm_get(dev_priv); - pw_status = I915_READ(VLV_GTLC_PW_STATUS); rpmodectl1 = I915_READ(GEN6_RP_CONTROL); rcctl1 = I915_READ(GEN6_RC_CONTROL); - intel_runtime_pm_put(dev_priv); - seq_printf(m, "Video Turbo Mode: %s\n", yesno(rpmodectl1 & GEN6_RP_MEDIA_TURBO)); seq_printf(m, "Turbo enabled: %s\n", @@ -1506,21 +1498,12 @@ static int vlv_drpc_info(struct seq_file *m) static int gen6_drpc_info(struct seq_file *m) { struct drm_i915_private *dev_priv = node_to_i915(m->private); - struct drm_device *dev = &dev_priv->drm; u32 rpmodectl1, gt_core_status, rcctl1, rc6vids = 0; u32 gen9_powergate_enable = 0, gen9_powergate_status = 0; unsigned forcewake_count; - int count = 0, ret; - - ret = mutex_lock_interruptible(&dev->struct_mutex); - if (ret) - return ret; - intel_runtime_pm_get(dev_priv); - - spin_lock_irq(&dev_priv->uncore.lock); - forcewake_count = dev_priv->uncore.fw_domain[FW_DOMAIN_ID_RENDER].wake_count; - spin_unlock_irq(&dev_priv->uncore.lock); + int count = 0; + forcewake_count = READ_ONCE(dev_priv->uncore.fw_domain[FW_DOMAIN_ID_RENDER].wake_count); if (forcewake_count) { seq_puts(m, "RC information inaccurate because somebody " "holds a forcewake reference \n"); @@ -1540,13 +1523,11 @@ static int gen6_drpc_info(struct seq_file *m) gen9_powergate_enable = I915_READ(GEN9_PG_ENABLE); gen9_powergate_status = I915_READ(GEN9_PWRGT_DOMAIN_STATUS); } - mutex_unlock(&dev->struct_mutex); + mutex_lock(&dev_priv->rps.hw_lock); sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS, &rc6vids); mutex_unlock(&dev_priv->rps.hw_lock); - intel_runtime_pm_put(dev_priv); - seq_printf(m, "Video Turbo Mode: %s\n", yesno(rpmodectl1 & GEN6_RP_MEDIA_TURBO)); seq_printf(m, "HW control enabled: %s\n", @@ -1623,13 +1604,20 @@ static int gen6_drpc_info(struct seq_file *m) static int i915_drpc_info(struct seq_file *m, void *unused) { struct drm_i915_private *dev_priv = node_to_i915(m->private); + int err; + + intel_runtime_pm_get(dev_priv); if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) - return vlv_drpc_info(m); + err = vlv_drpc_info(m); else if (INTEL_GEN(dev_priv) >= 6) - return gen6_drpc_info(m); + err = gen6_drpc_info(m); else - return ironlake_drpc_info(m); + err = ironlake_drpc_info(m); + + intel_runtime_pm_put(dev_priv); + + return err; } static int i915_frontbuffer_tracking(struct seq_file *m, void *unused) -- 2.20.1