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path: root/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c
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Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_irq.c')
-rw-r--r--drivers/gpu/drm/vmwgfx/vmwgfx_irq.c295
1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c b/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c
new file mode 100644
index 00000000000..9e0f0306eed
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c
@@ -0,0 +1,295 @@
+/**************************************************************************
+ *
+ * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "drmP.h"
+#include "vmwgfx_drv.h"
+
+#define VMW_FENCE_WRAP (1 << 24)
+
+irqreturn_t vmw_irq_handler(DRM_IRQ_ARGS)
+{
+ struct drm_device *dev = (struct drm_device *)arg;
+ struct vmw_private *dev_priv = vmw_priv(dev);
+ uint32_t status;
+
+ spin_lock(&dev_priv->irq_lock);
+ status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
+ spin_unlock(&dev_priv->irq_lock);
+
+ if (status & SVGA_IRQFLAG_ANY_FENCE)
+ wake_up_all(&dev_priv->fence_queue);
+ if (status & SVGA_IRQFLAG_FIFO_PROGRESS)
+ wake_up_all(&dev_priv->fifo_queue);
+
+ if (likely(status)) {
+ outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static bool vmw_fifo_idle(struct vmw_private *dev_priv, uint32_t sequence)
+{
+ uint32_t busy;
+
+ mutex_lock(&dev_priv->hw_mutex);
+ busy = vmw_read(dev_priv, SVGA_REG_BUSY);
+ mutex_unlock(&dev_priv->hw_mutex);
+
+ return (busy == 0);
+}
+
+
+bool vmw_fence_signaled(struct vmw_private *dev_priv,
+ uint32_t sequence)
+{
+ __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
+ struct vmw_fifo_state *fifo_state;
+ bool ret;
+
+ if (likely(dev_priv->last_read_sequence - sequence < VMW_FENCE_WRAP))
+ return true;
+
+ dev_priv->last_read_sequence = ioread32(fifo_mem + SVGA_FIFO_FENCE);
+ if (likely(dev_priv->last_read_sequence - sequence < VMW_FENCE_WRAP))
+ return true;
+
+ fifo_state = &dev_priv->fifo;
+ if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE) &&
+ vmw_fifo_idle(dev_priv, sequence))
+ return true;
+
+ /**
+ * Below is to signal stale fences that have wrapped.
+ * First, block fence submission.
+ */
+
+ down_read(&fifo_state->rwsem);
+
+ /**
+ * Then check if the sequence is higher than what we've actually
+ * emitted. Then the fence is stale and signaled.
+ */
+
+ ret = ((dev_priv->fence_seq - sequence) > VMW_FENCE_WRAP);
+ up_read(&fifo_state->rwsem);
+
+ return ret;
+}
+
+int vmw_fallback_wait(struct vmw_private *dev_priv,
+ bool lazy,
+ bool fifo_idle,
+ uint32_t sequence,
+ bool interruptible,
+ unsigned long timeout)
+{
+ struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
+
+ uint32_t count = 0;
+ uint32_t signal_seq;
+ int ret;
+ unsigned long end_jiffies = jiffies + timeout;
+ bool (*wait_condition)(struct vmw_private *, uint32_t);
+ DEFINE_WAIT(__wait);
+
+ wait_condition = (fifo_idle) ? &vmw_fifo_idle :
+ &vmw_fence_signaled;
+
+ /**
+ * Block command submission while waiting for idle.
+ */
+
+ if (fifo_idle)
+ down_read(&fifo_state->rwsem);
+ signal_seq = dev_priv->fence_seq;
+ ret = 0;
+
+ for (;;) {
+ prepare_to_wait(&dev_priv->fence_queue, &__wait,
+ (interruptible) ?
+ TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
+ if (wait_condition(dev_priv, sequence))
+ break;
+ if (time_after_eq(jiffies, end_jiffies)) {
+ DRM_ERROR("SVGA device lockup.\n");
+ break;
+ }
+ if (lazy)
+ schedule_timeout(1);
+ else if ((++count & 0x0F) == 0) {
+ /**
+ * FIXME: Use schedule_hr_timeout here for
+ * newer kernels and lower CPU utilization.
+ */
+
+ __set_current_state(TASK_RUNNING);
+ schedule();
+ __set_current_state((interruptible) ?
+ TASK_INTERRUPTIBLE :
+ TASK_UNINTERRUPTIBLE);
+ }
+ if (interruptible && signal_pending(current)) {
+ ret = -ERESTART;
+ break;
+ }
+ }
+ finish_wait(&dev_priv->fence_queue, &__wait);
+ if (ret == 0 && fifo_idle) {
+ __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
+ iowrite32(signal_seq, fifo_mem + SVGA_FIFO_FENCE);
+ }
+ wake_up_all(&dev_priv->fence_queue);
+ if (fifo_idle)
+ up_read(&fifo_state->rwsem);
+
+ return ret;
+}
+
+int vmw_wait_fence(struct vmw_private *dev_priv,
+ bool lazy, uint32_t sequence,
+ bool interruptible, unsigned long timeout)
+{
+ long ret;
+ unsigned long irq_flags;
+ struct vmw_fifo_state *fifo = &dev_priv->fifo;
+
+ if (likely(dev_priv->last_read_sequence - sequence < VMW_FENCE_WRAP))
+ return 0;
+
+ if (likely(vmw_fence_signaled(dev_priv, sequence)))
+ return 0;
+
+ vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
+
+ if (!(fifo->capabilities & SVGA_FIFO_CAP_FENCE))
+ return vmw_fallback_wait(dev_priv, lazy, true, sequence,
+ interruptible, timeout);
+
+ if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
+ return vmw_fallback_wait(dev_priv, lazy, false, sequence,
+ interruptible, timeout);
+
+ mutex_lock(&dev_priv->hw_mutex);
+ if (atomic_add_return(1, &dev_priv->fence_queue_waiters) > 0) {
+ spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
+ outl(SVGA_IRQFLAG_ANY_FENCE,
+ dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
+ vmw_write(dev_priv, SVGA_REG_IRQMASK,
+ vmw_read(dev_priv, SVGA_REG_IRQMASK) |
+ SVGA_IRQFLAG_ANY_FENCE);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
+ }
+ mutex_unlock(&dev_priv->hw_mutex);
+
+ if (interruptible)
+ ret = wait_event_interruptible_timeout
+ (dev_priv->fence_queue,
+ vmw_fence_signaled(dev_priv, sequence),
+ timeout);
+ else
+ ret = wait_event_timeout
+ (dev_priv->fence_queue,
+ vmw_fence_signaled(dev_priv, sequence),
+ timeout);
+
+ if (unlikely(ret == -ERESTARTSYS))
+ ret = -ERESTART;
+ else if (unlikely(ret == 0))
+ ret = -EBUSY;
+ else if (likely(ret > 0))
+ ret = 0;
+
+ mutex_lock(&dev_priv->hw_mutex);
+ if (atomic_dec_and_test(&dev_priv->fence_queue_waiters)) {
+ spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
+ vmw_write(dev_priv, SVGA_REG_IRQMASK,
+ vmw_read(dev_priv, SVGA_REG_IRQMASK) &
+ ~SVGA_IRQFLAG_ANY_FENCE);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
+ }
+ mutex_unlock(&dev_priv->hw_mutex);
+
+ return ret;
+}
+
+void vmw_irq_preinstall(struct drm_device *dev)
+{
+ struct vmw_private *dev_priv = vmw_priv(dev);
+ uint32_t status;
+
+ if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
+ return;
+
+ spin_lock_init(&dev_priv->irq_lock);
+ status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
+ outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
+}
+
+int vmw_irq_postinstall(struct drm_device *dev)
+{
+ return 0;
+}
+
+void vmw_irq_uninstall(struct drm_device *dev)
+{
+ struct vmw_private *dev_priv = vmw_priv(dev);
+ uint32_t status;
+
+ if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
+ return;
+
+ mutex_lock(&dev_priv->hw_mutex);
+ vmw_write(dev_priv, SVGA_REG_IRQMASK, 0);
+ mutex_unlock(&dev_priv->hw_mutex);
+
+ status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
+ outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
+}
+
+#define VMW_FENCE_WAIT_TIMEOUT 3*HZ;
+
+int vmw_fence_wait_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_vmw_fence_wait_arg *arg =
+ (struct drm_vmw_fence_wait_arg *)data;
+ unsigned long timeout;
+
+ if (!arg->cookie_valid) {
+ arg->cookie_valid = 1;
+ arg->kernel_cookie = jiffies + VMW_FENCE_WAIT_TIMEOUT;
+ }
+
+ timeout = jiffies;
+ if (time_after_eq(timeout, (unsigned long)arg->kernel_cookie))
+ return -EBUSY;
+
+ timeout = (unsigned long)arg->kernel_cookie - timeout;
+ return vmw_wait_fence(vmw_priv(dev), true, arg->sequence, true, timeout);
+}