drm/i915: forcewake warning fixes in debugfs

Some more unsafe debugfs access are fixed with this patch. I tested all reads,
but didn't thoroughly test the writes.

Cc: "Nicolas Kalkhof" <nkalkhof@web.de>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 8e95d66800b09abdcd38f196b6503990eed7ccd3..f2e02075d51009705492d0bd52be108ea8532f95 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -635,11 +635,16 @@ static int i915_ringbuffer_info(struct seq_file *m, void *data)
        struct drm_device *dev = node->minor->dev;
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct intel_ring_buffer *ring;
+       int ret;
 
        ring = &dev_priv->ring[(uintptr_t)node->info_ent->data];
        if (ring->size == 0)
                return 0;
 
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
        seq_printf(m, "Ring %s:\n", ring->name);
        seq_printf(m, "  Head :    %08x\n", I915_READ_HEAD(ring) & HEAD_ADDR);
        seq_printf(m, "  Tail :    %08x\n", I915_READ_TAIL(ring) & TAIL_ADDR);
@@ -653,6 +658,8 @@ static int i915_ringbuffer_info(struct seq_file *m, void *data)
        seq_printf(m, "  Control : %08x\n", I915_READ_CTL(ring));
        seq_printf(m, "  Start :   %08x\n", I915_READ_START(ring));
 
+       mutex_unlock(&dev->struct_mutex);
+
        return 0;
 }
 
@@ -841,7 +848,16 @@ static int i915_rstdby_delays(struct seq_file *m, void *unused)
        struct drm_info_node *node = (struct drm_info_node *) m->private;
        struct drm_device *dev = node->minor->dev;
        drm_i915_private_t *dev_priv = dev->dev_private;
-       u16 crstanddelay = I915_READ16(CRSTANDVID);
+       u16 crstanddelay;
+       int ret;
+
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
+       crstanddelay = I915_READ16(CRSTANDVID);
+
+       mutex_unlock(&dev->struct_mutex);
 
        seq_printf(m, "w/ctx: %d, w/o ctx: %d\n", (crstanddelay >> 8) & 0x3f, (crstanddelay & 0x3f));
 
@@ -939,7 +955,11 @@ static int i915_delayfreq_table(struct seq_file *m, void *unused)
        struct drm_device *dev = node->minor->dev;
        drm_i915_private_t *dev_priv = dev->dev_private;
        u32 delayfreq;
-       int i;
+       int ret, i;
+
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
 
        for (i = 0; i < 16; i++) {
                delayfreq = I915_READ(PXVFREQ_BASE + i * 4);
@@ -947,6 +967,8 @@ static int i915_delayfreq_table(struct seq_file *m, void *unused)
                           (delayfreq & PXVFREQ_PX_MASK) >> PXVFREQ_PX_SHIFT);
        }
 
+       mutex_unlock(&dev->struct_mutex);
+
        return 0;
 }
 
@@ -961,13 +983,19 @@ static int i915_inttoext_table(struct seq_file *m, void *unused)
        struct drm_device *dev = node->minor->dev;
        drm_i915_private_t *dev_priv = dev->dev_private;
        u32 inttoext;
-       int i;
+       int ret, i;
+
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
 
        for (i = 1; i <= 32; i++) {
                inttoext = I915_READ(INTTOEXT_BASE_ILK + i * 4);
                seq_printf(m, "INTTOEXT%02d: 0x%08x\n", i, inttoext);
        }
 
+       mutex_unlock(&dev->struct_mutex);
+
        return 0;
 }
 
@@ -976,9 +1004,19 @@ static int i915_drpc_info(struct seq_file *m, void *unused)
        struct drm_info_node *node = (struct drm_info_node *) m->private;
        struct drm_device *dev = node->minor->dev;
        drm_i915_private_t *dev_priv = dev->dev_private;
-       u32 rgvmodectl = I915_READ(MEMMODECTL);
-       u32 rstdbyctl = I915_READ(RSTDBYCTL);
-       u16 crstandvid = I915_READ16(CRSTANDVID);
+       u32 rgvmodectl, rstdbyctl;
+       u16 crstandvid;
+       int ret;
+
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
+       rgvmodectl = I915_READ(MEMMODECTL);
+       rstdbyctl = I915_READ(RSTDBYCTL);
+       crstandvid = I915_READ16(CRSTANDVID);
+
+       mutex_unlock(&dev->struct_mutex);
 
        seq_printf(m, "HD boost: %s\n", (rgvmodectl & MEMMODE_BOOST_EN) ?
                   "yes" : "no");
@@ -1166,9 +1204,16 @@ static int i915_gfxec(struct seq_file *m, void *unused)
        struct drm_info_node *node = (struct drm_info_node *) m->private;
        struct drm_device *dev = node->minor->dev;
        drm_i915_private_t *dev_priv = dev->dev_private;
+       int ret;
+
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
 
        seq_printf(m, "GFXEC: %ld\n", (unsigned long)I915_READ(0x112f4));
 
+       mutex_unlock(&dev->struct_mutex);
+
        return 0;
 }