From patchwork Mon Nov 12 19:39:11 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Widawsky X-Patchwork-Id: 1730171 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by patchwork2.kernel.org (Postfix) with ESMTP id 05A90DFE80 for ; Mon, 12 Nov 2012 19:39:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 088539F0F5 for ; Mon, 12 Nov 2012 11:39:03 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from shiva.chad-versace.us (209-20-75-48.static.cloud-ips.com [209.20.75.48]) by gabe.freedesktop.org (Postfix) with ESMTP id 8ED189E860 for ; Mon, 12 Nov 2012 11:38:51 -0800 (PST) Received: by shiva.chad-versace.us (Postfix, from userid 1005) id 4B440885B9; Mon, 12 Nov 2012 19:40:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on shiva.chad-versace.us X-Spam-Level: X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=unavailable version=3.3.2 Received: from lundgren.jf.intel.com (jfdmzpr05-ext.jf.intel.com [134.134.139.74]) by shiva.chad-versace.us (Postfix) with ESMTPSA id C1C72884E8; Mon, 12 Nov 2012 19:40:17 +0000 (UTC) From: Ben Widawsky To: intel-gfx@lists.freedesktop.org Date: Mon, 12 Nov 2012 11:39:11 -0800 Message-Id: <1352749151-29731-1-git-send-email-ben@bwidawsk.net> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1352747494-1653-1-git-send-email-ben@bwidawsk.net> References: <1352747494-1653-1-git-send-email-ben@bwidawsk.net> Cc: Ben Widawsky Subject: [Intel-gfx] [PATCH 09/18 v4] drm/i915: make PM interrupt writes non-destructive X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org PM interrupts have an expanded role on HSW. It helps route the EBOX interrupts. This patch is necessary to make the existing code which touches the mask, and enable registers more friendly to other code paths that also will need these registers. To be more explicit: At preinstall all interrupts are masked and disabled. This implies that preinstall should always happen before any enabling/disabling of RPS or other interrupts. The PMIMR is touched by the workqueue, so enable/disable touch IER and IIR. Similarly, the code currently expects IMR has no use outside of the RPS related interrupts so they unconditionally set 0, or ~0. We could use IER in the workqueue, and IMR elsewhere, but since the workqueue use-case is more transient the existing usage makes sense. Disable RPS events: IER := IER & ~GEN6_PM_RPS_EVENTS // Disable RPS related interrupts IIR := GEN6_PM_RPS_EVENTS // Disable any outstanding interrupts Enable RPS events: IER := IER | GEN6_PM_RPS_EVENTS // Enable the RPS related interrupts IIR := GEN6_PM_RPS_EVENTS // Make sure there were no leftover events (really shouldn't happen) v2: Shouldn't destroy PMIIR or PMIMR VEBOX interrupt state in enable/disable rps functions (Haihao) v3: Bug found by Chris where we were clearing the wrong bits at rps disable. expanded commit message v4: v3 was based off the wrong branch CC: Chris Wilson Signed-off-by: Ben Widawsky --- drivers/gpu/drm/i915/i915_irq.c | 17 +++++++++-------- drivers/gpu/drm/i915/i915_reg.h | 2 +- drivers/gpu/drm/i915/intel_pm.c | 10 +++++----- 3 files changed, 15 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index d5aef6c..5533e55 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -372,10 +372,11 @@ static void gen6_pm_rps_work(struct work_struct *work) pm_iir = dev_priv->rps.pm_iir; dev_priv->rps.pm_iir = 0; pm_imr = I915_READ(GEN6_PMIMR); - I915_WRITE(GEN6_PMIMR, 0); + /* Make sure not to corrupt PMIMR state used by ringbuffer code */ + I915_WRITE(GEN6_PMIMR, pm_imr & ~GEN6_PM_RPS_EVENTS); spin_unlock_irq(&dev_priv->rps.lock); - if ((pm_iir & GEN6_PM_DEFERRED_EVENTS) == 0) + if ((pm_iir & GEN6_PM_RPS_EVENTS) == 0) return; mutex_lock(&dev_priv->rps.hw_lock); @@ -536,17 +537,17 @@ static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv, unsigned long flags; spin_lock_irqsave(&dev_priv->rps.lock, flags); - dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_DEFERRED_EVENTS; + dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS; if (dev_priv->rps.pm_iir) { I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir); /* We never want to mask useful interrupts. (also posting read) */ - WARN_ON(I915_READ_NOTRACE(GEN6_PMIMR) & ~GEN6_PM_DEFERRED_EVENTS); + WARN_ON(I915_READ_NOTRACE(GEN6_PMIMR) & ~GEN6_PM_RPS_EVENTS); /* TODO: if queue_work is slow, move it out of the spinlock */ queue_work(dev_priv->wq, &dev_priv->rps.work); } spin_unlock_irqrestore(&dev_priv->rps.lock, flags); - if (pm_iir & ~GEN6_PM_DEFERRED_EVENTS) + if (pm_iir & ~GEN6_PM_RPS_EVENTS) DRM_ERROR("Unexpected PM interrupted\n"); } @@ -619,7 +620,7 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg) if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS) blc_event = true; - if (pm_iir & GEN6_PM_DEFERRED_EVENTS) + if (pm_iir & GEN6_PM_RPS_EVENTS) gen6_queue_rps_work(dev_priv, pm_iir); I915_WRITE(GTIIR, gt_iir); @@ -759,7 +760,7 @@ static irqreturn_t ivybridge_irq_handler(int irq, void *arg) if (pm_iir) { if (IS_HASWELL(dev)) hsw_pm_irq_handler(dev_priv, pm_iir); - else if (pm_iir & GEN6_PM_DEFERRED_EVENTS) + else if (pm_iir & GEN6_PM_RPS_EVENTS) gen6_queue_rps_work(dev_priv, pm_iir); I915_WRITE(GEN6_PMIIR, pm_iir); ret = IRQ_HANDLED; @@ -841,7 +842,7 @@ static irqreturn_t ironlake_irq_handler(int irq, void *arg) if (IS_GEN5(dev) && de_iir & DE_PCU_EVENT) ironlake_handle_rps_change(dev); - if (IS_GEN6(dev) && pm_iir & GEN6_PM_DEFERRED_EVENTS) + if (IS_GEN6(dev) && pm_iir & GEN6_PM_RPS_EVENTS) gen6_queue_rps_work(dev_priv, pm_iir); /* should clear PCH hotplug event before clear CPU irq */ diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 21f5d61..70f9ad7 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -4269,7 +4269,7 @@ #define GEN6_PM_RP_DOWN_THRESHOLD (1<<4) #define GEN6_PM_RP_UP_EI_EXPIRED (1<<2) #define GEN6_PM_RP_DOWN_EI_EXPIRED (1<<1) -#define GEN6_PM_DEFERRED_EVENTS (GEN6_PM_RP_UP_THRESHOLD | \ +#define GEN6_PM_RPS_EVENTS (GEN6_PM_RP_UP_THRESHOLD | \ GEN6_PM_RP_DOWN_THRESHOLD | \ GEN6_PM_RP_DOWN_TIMEOUT) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 8f15616..79b7af4 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2354,7 +2354,7 @@ static void gen6_disable_rps(struct drm_device *dev) I915_WRITE(GEN6_RC_CONTROL, 0); I915_WRITE(GEN6_RPNSWREQ, 1 << 31); I915_WRITE(GEN6_PMINTRMSK, 0xffffffff); - I915_WRITE(GEN6_PMIER, 0); + I915_WRITE(GEN6_PMIER, I915_READ(GEN6_PMIER) & ~GEN6_PM_RPS_EVENTS); /* Complete PM interrupt masking here doesn't race with the rps work * item again unmasking PM interrupts because that is using a different * register (PMIMR) to mask PM interrupts. The only risk is in leaving @@ -2364,7 +2364,7 @@ static void gen6_disable_rps(struct drm_device *dev) dev_priv->rps.pm_iir = 0; spin_unlock_irq(&dev_priv->rps.lock); - I915_WRITE(GEN6_PMIIR, I915_READ(GEN6_PMIIR)); + I915_WRITE(GEN6_PMIIR, GEN6_PM_RPS_EVENTS); } int intel_enable_rc6(const struct drm_device *dev) @@ -2518,12 +2518,12 @@ static void gen6_enable_rps(struct drm_device *dev) gen6_set_rps(dev_priv->dev, (gt_perf_status & 0xff00) >> 8); /* requires MSI enabled */ - I915_WRITE(GEN6_PMIER, GEN6_PM_DEFERRED_EVENTS); + I915_WRITE(GEN6_PMIER, I915_READ(GEN6_PMIER) | GEN6_PM_RPS_EVENTS); spin_lock_irq(&dev_priv->rps.lock); WARN_ON(dev_priv->rps.pm_iir != 0); - I915_WRITE(GEN6_PMIMR, 0); + I915_WRITE(GEN6_PMIIR, GEN6_PM_RPS_EVENTS); spin_unlock_irq(&dev_priv->rps.lock); - /* enable all PM interrupts */ + /* unmask all PM interrupts */ I915_WRITE(GEN6_PMINTRMSK, 0); rc6vids = 0;