diff options
author | Ian Romanick <idr@us.ibm.com> | 2005-06-14 22:34:11 +0000 |
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committer | Ian Romanick <idr@us.ibm.com> | 2005-06-14 22:34:11 +0000 |
commit | 72cfc797b51e59ecf8a2787c6a176838241cc94b (patch) | |
tree | 87ade354c97e962a29b3d1fc8b620972754092eb /shared-core/mga_irq.c | |
parent | 3585bdf7d81a92c729bb5bcbc7cfca6048d640ce (diff) |
Adds support for PCI cards to MGA DRM
This patch adds serveral new ioctls and a new query to get_param query to
support PCI MGA cards.
Two ioctls were added to implement interrupt based waiting. With this
change, the client-side driver no longer needs to map the primary DMA
region or the MMIO region. Previously, end-of-frame waiting was done by
busy waiting in the client-side driver until one of the MMIO registers
(the current DMA pointer) matched a pointer to the end of primary DMA
space. By using interrupts, the busy waiting and the extra mappings are
removed.
A third ioctl was added to bootstrap DMA. This ioctl, which is used by the
X-server, moves a *LOT* of code from the X-server into the kernel. This
allows the kernel to do whatever needs to be done to setup DMA buffers.
The entire process and the locations of the buffers are hidden from
user-mode.
Additionally, a get_param query was added to differentiate between G4x0
cards and G550 cards. A gap was left in the numbering sequence so that,
if needed, G450 cards could be distinguished from G400 cards. According
to Ville Syrjälä, the G4x0 cards and the G550 cards handle
anisotropic filtering differently. This seems the most compatible way
to let the client-side driver know which card it's own. Doing this very
small change now eliminates the need to bump the DRM minor version
twice.
http://marc.theaimsgroup.com/?l=dri-devel&m=106625815319773&w=2
A number of ioctl handlers in linux-core were also modified so that they
could be called in-kernel. In these cases, the in-kernel callable
version kept the existing name (e.g., drm_agp_acquire) and the ioctl
handler added _ioctl to the name (e.g., drm_agp_acquire_ioctl).
This patch also replaces the drm_agp_do_release function with
drm_agp_release. drm_agp_release (drm_core_agp_release in the previous
patch) is very similar to drm_agp_do_release, and I saw no reason to
have both.
This commit *breaks the build* on BSD. Eric said that he would make the
required updates to the BSD side soon.
Xorg bug: 3259 Reviewed by: Eric Anholt
Diffstat (limited to 'shared-core/mga_irq.c')
-rw-r--r-- | shared-core/mga_irq.c | 50 |
1 files changed, 48 insertions, 2 deletions
diff --git a/shared-core/mga_irq.c b/shared-core/mga_irq.c index 99a23fe1..16dfd44b 100644 --- a/shared-core/mga_irq.c +++ b/shared-core/mga_irq.c @@ -40,6 +40,7 @@ irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS) drm_device_t *dev = (drm_device_t *) arg; drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; int status; + int handled = 0; status = MGA_READ(MGA_STATUS); @@ -49,6 +50,30 @@ irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS) atomic_inc(&dev->vbl_received); DRM_WAKEUP(&dev->vbl_queue); drm_vbl_send_signals(dev); + handled = 1; + } + + /* SOFTRAP interrupt */ + if (status & MGA_SOFTRAPEN) { + const u32 prim_start = MGA_READ(MGA_PRIMADDRESS); + const u32 prim_end = MGA_READ(MGA_PRIMEND); + + + MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR); + + /* In addition to clearing the interrupt-pending bit, we + * have to write to MGA_PRIMEND to re-start the DMA operation. + */ + if ( (prim_start & ~0x03) != (prim_end & ~0x03) ) { + MGA_WRITE(MGA_PRIMEND, prim_end); + } + + atomic_inc(&dev_priv->last_fence_retired); + DRM_WAKEUP(&dev_priv->fence_queue); + handled = 1; + } + + if ( handled ) { return IRQ_HANDLED; } return IRQ_NONE; @@ -72,6 +97,25 @@ int mga_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence) return ret; } +int mga_driver_fence_wait(drm_device_t * dev, unsigned int *sequence) +{ + drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; + unsigned int cur_fence; + int ret = 0; + + /* Assume that the user has missed the current sequence number + * by about a day rather than she wants to wait for years + * using fences. + */ + DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ, + (((cur_fence = atomic_read(&dev_priv->last_fence_retired)) + - *sequence) <= (1 << 23))); + + *sequence = cur_fence; + + return ret; +} + void mga_driver_irq_preinstall(drm_device_t * dev) { drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; @@ -86,8 +130,10 @@ void mga_driver_irq_postinstall(drm_device_t * dev) { drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; - /* Turn on VBL interrupt */ - MGA_WRITE(MGA_IEN, MGA_VLINEIEN); + DRM_INIT_WAITQUEUE( &dev_priv->fence_queue ); + + /* Turn on vertical blank interrupt and soft trap interrupt. */ + MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); } void mga_driver_irq_uninstall(drm_device_t * dev) |