[PATCH v4 19/22] drm: omapdrm: Simplify IRQ wait implementation
Tomi Valkeinen
tomi.valkeinen at ti.com
Fri Dec 16 12:24:26 UTC 2016
On 14/12/16 02:27, Laurent Pinchart wrote:
> Now that the IRQ list is used for IRQ wait only we can merge
> omap_drm_irq and omap_irq_wait and simplify the implementation.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
> drivers/gpu/drm/omapdrm/omap_drv.h | 17 +------
> drivers/gpu/drm/omapdrm/omap_irq.c | 94 ++++++++++++++------------------------
> 2 files changed, 37 insertions(+), 74 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/omap_drv.h b/drivers/gpu/drm/omapdrm/omap_drv.h
> index dad7d6161563..8ef7e8963bd9 100644
> --- a/drivers/gpu/drm/omapdrm/omap_drv.h
> +++ b/drivers/gpu/drm/omapdrm/omap_drv.h
> @@ -48,19 +48,6 @@ struct omap_drm_window {
> uint32_t src_w, src_h;
> };
>
> -/* For transiently registering for different DSS irqs that various parts
> - * of the KMS code need during setup/configuration. We these are not
> - * necessarily the same as what drm_vblank_get/put() are requesting, and
> - * the hysteresis in drm_vblank_put() is not necessarily desirable for
> - * internal housekeeping related irq usage.
> - */
> -struct omap_drm_irq {
> - struct list_head node;
> - uint32_t irqmask;
> - bool registered;
> - void (*irq)(struct omap_drm_irq *irq);
> -};
> -
> /* For KMS code that needs to wait for a certain # of IRQs:
> */
> struct omap_irq_wait;
> @@ -101,8 +88,8 @@ struct omap_drm_private {
> struct drm_property *zorder_prop;
>
> /* irq handling: */
> - struct list_head irq_list; /* list of omap_drm_irq */
> - uint32_t irq_mask; /* enabled irqs in addition to irq_list */
> + struct list_head wait_list; /* list of omap_irq_wait */
> + uint32_t irq_mask; /* enabled irqs in addition to wait_list */
>
> /* atomic commit */
> struct {
> diff --git a/drivers/gpu/drm/omapdrm/omap_irq.c b/drivers/gpu/drm/omapdrm/omap_irq.c
> index 1982759a1c27..f9510c13e1a2 100644
> --- a/drivers/gpu/drm/omapdrm/omap_irq.c
> +++ b/drivers/gpu/drm/omapdrm/omap_irq.c
> @@ -21,17 +21,23 @@
>
> static DEFINE_SPINLOCK(list_lock);
>
> +struct omap_irq_wait {
> + struct list_head node;
> + uint32_t irqmask;
> + int count;
> +};
> +
> /* call with list_lock and dispc runtime held */
> static void omap_irq_update(struct drm_device *dev)
> {
> struct omap_drm_private *priv = dev->dev_private;
> - struct omap_drm_irq *irq;
> + struct omap_irq_wait *wait;
> uint32_t irqmask = priv->irq_mask;
>
> assert_spin_locked(&list_lock);
>
> - list_for_each_entry(irq, &priv->irq_list, node)
> - irqmask |= irq->irqmask;
> + list_for_each_entry(wait, &priv->wait_list, node)
> + irqmask |= wait->irqmask;
>
> DBG("irqmask=%08x", irqmask);
>
> @@ -39,61 +45,29 @@ static void omap_irq_update(struct drm_device *dev)
> dispc_read_irqenable(); /* flush posted write */
> }
>
> -static void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq)
> -{
> - struct omap_drm_private *priv = dev->dev_private;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&list_lock, flags);
> -
> - if (!WARN_ON(irq->registered)) {
> - irq->registered = true;
> - list_add(&irq->node, &priv->irq_list);
> - omap_irq_update(dev);
> - }
> -
> - spin_unlock_irqrestore(&list_lock, flags);
> -}
> -
> -static void omap_irq_unregister(struct drm_device *dev,
> - struct omap_drm_irq *irq)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&list_lock, flags);
> -
> - if (!WARN_ON(!irq->registered)) {
> - irq->registered = false;
> - list_del(&irq->node);
> - omap_irq_update(dev);
> - }
> -
> - spin_unlock_irqrestore(&list_lock, flags);
> -}
> -
> -struct omap_irq_wait {
> - struct omap_drm_irq irq;
> - int count;
> -};
> -
> static DECLARE_WAIT_QUEUE_HEAD(wait_event);
>
> -static void wait_irq(struct omap_drm_irq *irq)
> +static void omap_irq_wait_irq(struct omap_irq_wait *wait)
I think omap_irq_wait_irq_handler() or something like that would be a
better name. At least my thought based on the function name is that the
function waits.
> {
> - struct omap_irq_wait *wait =
> - container_of(irq, struct omap_irq_wait, irq);
> wait->count--;
> - wake_up_all(&wait_event);
> + wake_up(&wait_event);
> }
>
> struct omap_irq_wait * omap_irq_wait_init(struct drm_device *dev,
> uint32_t irqmask, int count)
> {
> + struct omap_drm_private *priv = dev->dev_private;
> struct omap_irq_wait *wait = kzalloc(sizeof(*wait), GFP_KERNEL);
A separate improvement, but I think we could just drop the
kzalloc/kfree, and use a local omap_irq_wait variable, passed to these
funcs.
> - wait->irq.irq = wait_irq;
> - wait->irq.irqmask = irqmask;
> + unsigned long flags;
> +
> + wait->irqmask = irqmask;
> wait->count = count;
> - omap_irq_register(dev, &wait->irq);
> +
> + spin_lock_irqsave(&list_lock, flags);
> + list_add(&wait->node, &priv->wait_list);
> + omap_irq_update(dev);
> + spin_unlock_irqrestore(&list_lock, flags);
> +
> return wait;
> }
>
> @@ -101,11 +75,16 @@ int omap_irq_wait(struct drm_device *dev, struct omap_irq_wait *wait,
> unsigned long timeout)
> {
> int ret = wait_event_timeout(wait_event, (wait->count <= 0), timeout);
> - omap_irq_unregister(dev, &wait->irq);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&list_lock, flags);
> + list_del(&wait->node);
> + omap_irq_update(dev);
> + spin_unlock_irqrestore(&list_lock, flags);
> +
> kfree(wait);
> - if (ret == 0)
> - return -1;
> - return 0;
> +
> + return ret == 0 ? -1 : 0;
> }
>
> /**
> @@ -213,7 +192,7 @@ static irqreturn_t omap_irq_handler(int irq, void *arg)
> {
> struct drm_device *dev = (struct drm_device *) arg;
> struct omap_drm_private *priv = dev->dev_private;
> - struct omap_drm_irq *handler, *n;
> + struct omap_irq_wait *wait, *n;
> unsigned long flags;
> unsigned int id;
> u32 irqstatus;
> @@ -241,12 +220,9 @@ static irqreturn_t omap_irq_handler(int irq, void *arg)
> omap_irq_fifo_underflow(priv, irqstatus);
>
> spin_lock_irqsave(&list_lock, flags);
> - list_for_each_entry_safe(handler, n, &priv->irq_list, node) {
> - if (handler->irqmask & irqstatus) {
> - spin_unlock_irqrestore(&list_lock, flags);
> - handler->irq(handler);
> - spin_lock_irqsave(&list_lock, flags);
> - }
> + list_for_each_entry_safe(wait, n, &priv->wait_list, node) {
> + if (wait->irqmask & irqstatus)
> + omap_irq_wait_irq(wait);
> }
> spin_unlock_irqrestore(&list_lock, flags);
>
> @@ -275,7 +251,7 @@ int omap_drm_irq_install(struct drm_device *dev)
> unsigned int i;
> int ret;
>
> - INIT_LIST_HEAD(&priv->irq_list);
> + INIT_LIST_HEAD(&priv->wait_list);
>
> priv->irq_mask = DISPC_IRQ_OCP_ERR;
>
>
With the function rename change:
Reviewed-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
Tomi
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