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    SubjectRe: [PATCH 08/32] drm/nouveau: use system_wq instead of dev_priv->wq
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    On Mon, 2011-01-03 at 14:49 +0100, Tejun Heo wrote:
    > With cmwq, there's no reason for nouveau to use a dedicated workqueue.
    > Drop dev_priv->wq and use system_wq instead.
    >
    > Because nouveau_irq_uninstall() may be called from unsleepable
    > context, the work items can't be flushed from there. Instead, init
    > and flush from nouveau_load/unload().
    Ehh, ok, why not! I'll push this through the nouveau tree, and it'll
    get to Dave from there.

    Thanks!
    Ben.
    >
    > Signed-off-by: Tejun Heo <tj@kernel.org>
    > Cc: David Airlie <airlied@linux.ie>
    > Cc: dri-devel@lists.freedesktop.org
    > ---
    > Only compile tested. Please feel free to take it into the subsystem
    > tree or simply ack - I'll route it through the wq tree.
    >
    > Thanks.
    >
    > drivers/gpu/drm/nouveau/nouveau_drv.h | 1 -
    > drivers/gpu/drm/nouveau/nouveau_irq.c | 9 ---------
    > drivers/gpu/drm/nouveau/nouveau_state.c | 19 ++++++++++---------
    > drivers/gpu/drm/nouveau/nv50_display.c | 4 ++--
    > 4 files changed, 12 insertions(+), 21 deletions(-)
    >
    > diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
    > index 1c7db64..2ecf875 100644
    > --- a/drivers/gpu/drm/nouveau/nouveau_drv.h
    > +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
    > @@ -580,7 +580,6 @@ struct drm_nouveau_private {
    >
    > struct nouveau_bo *vga_ram;
    >
    > - struct workqueue_struct *wq;
    > struct work_struct irq_work;
    > struct work_struct hpd_work;
    >
    > diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c b/drivers/gpu/drm/nouveau/nouveau_irq.c
    > index 7bfd9e6..7d05a06 100644
    > --- a/drivers/gpu/drm/nouveau/nouveau_irq.c
    > +++ b/drivers/gpu/drm/nouveau/nouveau_irq.c
    > @@ -52,17 +52,8 @@ static int nouveau_ratelimit(void)
    > void
    > nouveau_irq_preinstall(struct drm_device *dev)
    > {
    > - struct drm_nouveau_private *dev_priv = dev->dev_private;
    > -
    > /* Master disable */
    > nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
    > -
    > - if (dev_priv->card_type >= NV_50) {
    > - INIT_WORK(&dev_priv->irq_work, nv50_display_irq_handler_bh);
    > - INIT_WORK(&dev_priv->hpd_work, nv50_display_irq_hotplug_bh);
    > - spin_lock_init(&dev_priv->hpd_state.lock);
    > - INIT_LIST_HEAD(&dev_priv->vbl_waiting);
    > - }
    > }
    >
    > int
    > diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
    > index 049f755..2eea6ea 100644
    > --- a/drivers/gpu/drm/nouveau/nouveau_state.c
    > +++ b/drivers/gpu/drm/nouveau/nouveau_state.c
    > @@ -839,17 +839,17 @@ int nouveau_load(struct drm_device *dev, unsigned long flags)
    > dev->dev_private = dev_priv;
    > dev_priv->dev = dev;
    >
    > + /* the followings are used only by >= NV_50 */
    > + INIT_WORK(&dev_priv->irq_work, nv50_display_irq_handler_bh);
    > + INIT_WORK(&dev_priv->hpd_work, nv50_display_irq_hotplug_bh);
    > + spin_lock_init(&dev_priv->hpd_state.lock);
    > + INIT_LIST_HEAD(&dev_priv->vbl_waiting);
    > +
    > dev_priv->flags = flags & NOUVEAU_FLAGS;
    >
    > NV_DEBUG(dev, "vendor: 0x%X device: 0x%X class: 0x%X\n",
    > dev->pci_vendor, dev->pci_device, dev->pdev->class);
    >
    > - dev_priv->wq = create_workqueue("nouveau");
    > - if (!dev_priv->wq) {
    > - ret = -EINVAL;
    > - goto err_priv;
    > - }
    > -
    > /* resource 0 is mmio regs */
    > /* resource 1 is linear FB */
    > /* resource 2 is RAMIN (mmio regs + 0x1000000) */
    > @@ -862,7 +862,7 @@ int nouveau_load(struct drm_device *dev, unsigned long flags)
    > NV_ERROR(dev, "Unable to initialize the mmio mapping. "
    > "Please report your setup to " DRIVER_EMAIL "\n");
    > ret = -EINVAL;
    > - goto err_wq;
    > + goto err_priv;
    > }
    > NV_DEBUG(dev, "regs mapped ok at 0x%llx\n",
    > (unsigned long long)mmio_start_offs);
    > @@ -969,8 +969,6 @@ err_ramin:
    > iounmap(dev_priv->ramin);
    > err_mmio:
    > iounmap(dev_priv->mmio);
    > -err_wq:
    > - destroy_workqueue(dev_priv->wq);
    > err_priv:
    > kfree(dev_priv);
    > dev->dev_private = NULL;
    > @@ -992,6 +990,9 @@ int nouveau_unload(struct drm_device *dev)
    > engine->display.destroy(dev);
    > nouveau_card_takedown(dev);
    >
    > + flush_work_sync(&dev_priv->irq_work);
    > + flush_work_sync(&dev_priv->hpd_work);
    > +
    > iounmap(dev_priv->mmio);
    > iounmap(dev_priv->ramin);
    >
    > diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
    > index f624c61..3d569da 100644
    > --- a/drivers/gpu/drm/nouveau/nv50_display.c
    > +++ b/drivers/gpu/drm/nouveau/nv50_display.c
    > @@ -1110,7 +1110,7 @@ nv50_display_irq_handler(struct drm_device *dev)
    > dev_priv->hpd_state.hpd1_bits |= hpd1_bits;
    > spin_unlock(&dev_priv->hpd_state.lock);
    >
    > - queue_work(dev_priv->wq, &dev_priv->hpd_work);
    > + schedule_work(&dev_priv->hpd_work);
    > }
    >
    > while (nv_rd32(dev, NV50_PMC_INTR_0) & NV50_PMC_INTR_0_DISPLAY) {
    > @@ -1139,7 +1139,7 @@ nv50_display_irq_handler(struct drm_device *dev)
    > if (clock) {
    > nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
    > if (!work_pending(&dev_priv->irq_work))
    > - queue_work(dev_priv->wq, &dev_priv->irq_work);
    > + schedule_work(&dev_priv->irq_work);
    > delayed |= clock;
    > intr1 &= ~clock;
    > }




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