geemili
/
drm
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
drm/shared-core/i915_irq.c

597 lines
15 KiB
C
Raw Blame History

/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
*/
/*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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 TUNGSTEN GRAPHICS 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 "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
#define MAX_NOPID ((u32)~0)
/*
* These are the interrupts used by the driver
*/
#define I915_INTERRUPT_ENABLE_MASK (I915_USER_INTERRUPT | \
I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \
I915_DISPLAY_PIPE_B_EVENT_INTERRUPT)
static inline void
i915_enable_irq(drm_i915_private_t *dev_priv, uint32_t mask)
{
if ((dev_priv->irq_mask_reg & mask) != 0) {
dev_priv->irq_mask_reg &= ~mask;
I915_WRITE(IMR, dev_priv->irq_mask_reg);
(void) I915_READ(IMR);
}
}
static inline void
i915_disable_irq(drm_i915_private_t *dev_priv, uint32_t mask)
{
if ((dev_priv->irq_mask_reg & mask) != mask) {
dev_priv->irq_mask_reg |= mask;
I915_WRITE(IMR, dev_priv->irq_mask_reg);
(void) I915_READ(IMR);
}
}
/**
* i915_get_pipe - return the the pipe associated with a given plane
* @dev: DRM device
* @plane: plane to look for
*
* The Intel Mesa & 2D drivers call the vblank routines with a plane number
* rather than a pipe number, since they may not always be equal. This routine
* maps the given @plane back to a pipe number.
*/
static int
i915_get_pipe(struct drm_device *dev, int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 dspcntr;
dspcntr = plane ? I915_READ(DSPBCNTR) : I915_READ(DSPACNTR);
return dspcntr & DISPPLANE_SEL_PIPE_MASK ? 1 : 0;
}
/**
* i915_get_plane - return the the plane associated with a given pipe
* @dev: DRM device
* @pipe: pipe to look for
*
* The Intel Mesa & 2D drivers call the vblank routines with a plane number
* rather than a plane number, since they may not always be equal. This routine
* maps the given @pipe back to a plane number.
*/
static int
i915_get_plane(struct drm_device *dev, int pipe)
{
if (i915_get_pipe(dev, 0) == pipe)
return 0;
return 1;
}
/**
* i915_pipe_enabled - check if a pipe is enabled
* @dev: DRM device
* @pipe: pipe to check
*
* Reading certain registers when the pipe is disabled can hang the chip.
* Use this routine to make sure the PLL is running and the pipe is active
* before reading such registers if unsure.
*/
static int
i915_pipe_enabled(struct drm_device *dev, int pipe)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
return 1;
return 0;
}
u32 i915_get_vblank_counter(struct drm_device *dev, int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
unsigned long high_frame;
unsigned long low_frame;
u32 high1, high2, low, count;
int pipe;
pipe = i915_get_pipe(dev, plane);
high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
if (!i915_pipe_enabled(dev, pipe)) {
DRM_DEBUG("trying to get vblank count for disabled pipe %d\n", pipe);
return 0;
}
/*
* High & low register fields aren't synchronized, so make sure
* we get a low value that's stable across two reads of the high
* register.
*/
do {
high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
PIPE_FRAME_HIGH_SHIFT);
low = ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
PIPE_FRAME_LOW_SHIFT);
high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
PIPE_FRAME_HIGH_SHIFT);
} while (high1 != high2);
count = (high1 << 8) | low;
return count;
}
irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
{
struct drm_device *dev = (struct drm_device *) arg;
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 iir;
u32 pipea_stats = 0, pipeb_stats = 0;
int vblank = 0;
#ifdef __linux__
if (dev->pdev->msi_enabled)
I915_WRITE(IMR, ~0);
#endif
iir = I915_READ(IIR);
#if 0
DRM_DEBUG("flag=%08x\n", iir);
#endif
atomic_inc(&dev_priv->irq_received);
if (iir == 0) {
#ifdef __linux__
if (dev->pdev->msi_enabled) {
I915_WRITE(IMR, dev_priv->irq_mask_reg);
(void) I915_READ(IMR);
}
#endif
return IRQ_NONE;
}
/*
* Clear the PIPE(A|B)STAT regs before the IIR otherwise
* we may get extra interrupts.
*/
if (iir & I915_DISPLAY_PIPE_A_EVENT_INTERRUPT) {
pipea_stats = I915_READ(PIPEASTAT);
/* The vblank interrupt gets enabled even if we didn't ask for
it, so make sure it's shut down again */
if (!(dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A))
pipea_stats &= ~(PIPE_START_VBLANK_INTERRUPT_ENABLE |
PIPE_VBLANK_INTERRUPT_ENABLE);
else if (pipea_stats & (PIPE_START_VBLANK_INTERRUPT_STATUS|
PIPE_VBLANK_INTERRUPT_STATUS))
{
vblank++;
drm_handle_vblank(dev, i915_get_plane(dev, 0));
}
I915_WRITE(PIPEASTAT, pipea_stats);
}
if (iir & I915_DISPLAY_PIPE_B_EVENT_INTERRUPT) {
pipeb_stats = I915_READ(PIPEBSTAT);
/* The vblank interrupt gets enabled even if we didn't ask for
it, so make sure it's shut down again */
if (!(dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B))
pipeb_stats &= ~(PIPE_START_VBLANK_INTERRUPT_ENABLE |
PIPE_VBLANK_INTERRUPT_ENABLE);
else if (pipeb_stats & (PIPE_START_VBLANK_INTERRUPT_STATUS|
PIPE_VBLANK_INTERRUPT_STATUS))
{
vblank++;
drm_handle_vblank(dev, i915_get_plane(dev, 1));
}
#ifdef __linux__
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
if (pipeb_stats & I915_LEGACY_BLC_EVENT_ENABLE)
opregion_asle_intr(dev);
#endif
#endif
I915_WRITE(PIPEBSTAT, pipeb_stats);
}
#ifdef __linux__
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
if (iir & I915_ASLE_INTERRUPT)
opregion_asle_intr(dev);
#endif
#endif
if (dev_priv->sarea_priv)
dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
I915_WRITE(IIR, iir);
#ifdef __linux__
if (dev->pdev->msi_enabled)
I915_WRITE(IMR, dev_priv->irq_mask_reg);
#endif
(void) I915_READ(IIR); /* Flush posted writes */
if (iir & I915_USER_INTERRUPT) {
#ifdef I915_HAVE_GEM
dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
#endif
DRM_WAKEUP(&dev_priv->irq_queue);
#ifdef I915_HAVE_FENCE
i915_fence_handler(dev);
#endif
}
return IRQ_HANDLED;
}
int i915_emit_irq(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
RING_LOCALS;
i915_kernel_lost_context(dev);
DRM_DEBUG("\n");
i915_emit_breadcrumb(dev);
BEGIN_LP_RING(2);
OUT_RING(0);
OUT_RING(MI_USER_INTERRUPT);
ADVANCE_LP_RING();
return dev_priv->counter;
}
void i915_user_irq_on(drm_i915_private_t *dev_priv)
{
DRM_SPINLOCK(&dev_priv->user_irq_lock);
if (dev_priv->irq_enabled && (++dev_priv->user_irq_refcount == 1))
i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
}
void i915_user_irq_off(drm_i915_private_t *dev_priv)
{
DRM_SPINLOCK(&dev_priv->user_irq_lock);
#ifdef __linux__
BUG_ON(dev_priv->irq_enabled && dev_priv->user_irq_refcount <= 0);
#endif
if (dev_priv->irq_enabled && (--dev_priv->user_irq_refcount == 0))
i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
}
int i915_wait_irq(struct drm_device * dev, int irq_nr)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int ret = 0;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
READ_BREADCRUMB(dev_priv));
if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
if (dev_priv->sarea_priv)
dev_priv->sarea_priv->last_dispatch =
READ_BREADCRUMB(dev_priv);
return 0;
}
i915_user_irq_on(dev_priv);
DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
READ_BREADCRUMB(dev_priv) >= irq_nr);
i915_user_irq_off(dev_priv);
if (ret == -EBUSY) {
DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
}
if (dev_priv->sarea_priv)
dev_priv->sarea_priv->last_dispatch =
READ_BREADCRUMB(dev_priv);
return ret;
}
/* Needs the lock as it touches the ring.
*/
int i915_irq_emit(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_irq_emit_t *emit = data;
int result;
LOCK_TEST_WITH_RETURN(dev, file_priv);
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
result = i915_emit_irq(dev);
if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
DRM_ERROR("copy_to_user\n");
return -EFAULT;
}
return 0;
}
/* Doesn't need the hardware lock.
*/
int i915_irq_wait(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_irq_wait_t *irqwait = data;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
return i915_wait_irq(dev, irqwait->irq_seq);
}
int i915_enable_vblank(struct drm_device *dev, int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int pipe = i915_get_pipe(dev, plane);
u32 pipestat_reg = 0;
u32 mask_reg = 0;
u32 pipestat;
switch (pipe) {
case 0:
pipestat_reg = PIPEASTAT;
mask_reg |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
break;
case 1:
pipestat_reg = PIPEBSTAT;
mask_reg |= I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
break;
default:
DRM_ERROR("tried to enable vblank on non-existent pipe %d\n",
pipe);
break;
}
if (pipestat_reg)
{
pipestat = I915_READ (pipestat_reg);
/*
* Older chips didn't have the start vblank interrupt,
* but
*/
if (IS_I965G (dev))
pipestat |= PIPE_START_VBLANK_INTERRUPT_ENABLE;
else
pipestat |= PIPE_VBLANK_INTERRUPT_ENABLE;
/*
* Clear any pending status
*/
pipestat |= (PIPE_START_VBLANK_INTERRUPT_STATUS |
PIPE_VBLANK_INTERRUPT_STATUS);
I915_WRITE(pipestat_reg, pipestat);
}
DRM_SPINLOCK(&dev_priv->user_irq_lock);
i915_enable_irq(dev_priv, mask_reg);
DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
return 0;
}
void i915_disable_vblank(struct drm_device *dev, int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int pipe = i915_get_pipe(dev, plane);
u32 pipestat_reg = 0;
u32 mask_reg = 0;
u32 pipestat;
switch (pipe) {
case 0:
pipestat_reg = PIPEASTAT;
mask_reg |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
break;
case 1:
pipestat_reg = PIPEBSTAT;
mask_reg |= I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
break;
default:
DRM_ERROR("tried to disable vblank on non-existent pipe %d\n",
pipe);
break;
}
DRM_SPINLOCK(&dev_priv->user_irq_lock);
i915_disable_irq(dev_priv, mask_reg);
DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
if (pipestat_reg)
{
pipestat = I915_READ (pipestat_reg);
pipestat &= ~(PIPE_START_VBLANK_INTERRUPT_ENABLE |
PIPE_VBLANK_INTERRUPT_ENABLE);
/*
* Clear any pending status
*/
pipestat |= (PIPE_START_VBLANK_INTERRUPT_STATUS |
PIPE_VBLANK_INTERRUPT_STATUS);
I915_WRITE(pipestat_reg, pipestat);
(void) I915_READ(pipestat_reg);
}
}
static void i915_enable_interrupt (struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
dev_priv->irq_mask_reg = ~0;
I915_WRITE(IMR, dev_priv->irq_mask_reg);
I915_WRITE(IER, I915_INTERRUPT_ENABLE_MASK);
(void) I915_READ (IER);
#ifdef __linux__
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
opregion_enable_asle(dev);
#endif
#endif
dev_priv->irq_enabled = 1;
}
/* Set the vblank monitor pipe
*/
int i915_vblank_pipe_set(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
return 0;
}
int i915_vblank_pipe_get(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_vblank_pipe_t *pipe = data;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
return 0;
}
/**
* Schedule buffer swap at given vertical blank.
*/
int i915_vblank_swap(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
/* The delayed swap mechanism was fundamentally racy, and has been
* removed. The model was that the client requested a delayed flip/swap
* from the kernel, then waited for vblank before continuing to perform
* rendering. The problem was that the kernel might wake the client
* up before it dispatched the vblank swap (since the lock has to be
* held while touching the ringbuffer), in which case the client would
* clear and start the next frame before the swap occurred, and
* flicker would occur in addition to likely missing the vblank.
*
* In the absence of this ioctl, userland falls back to a correct path
* of waiting for a vblank, then dispatching the swap on its own.
* Context switching to userland and back is plenty fast enough for
* meeting the requirements of vblank swapping.
*/
return -EINVAL;
}
/* drm_dma.h hooks
*/
void i915_driver_irq_preinstall(struct drm_device * dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
I915_WRITE(HWSTAM, 0xeffe);
I915_WRITE(IMR, 0xffffffff);
I915_WRITE(IER, 0x0);
}
int i915_driver_irq_postinstall(struct drm_device * dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int ret, num_pipes = 2;
dev_priv->user_irq_refcount = 0;
dev_priv->irq_mask_reg = ~0;
ret = drm_vblank_init(dev, num_pipes);
if (ret)
return ret;
dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
i915_enable_interrupt(dev);
DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
/*
* Initialize the hardware status page IRQ location.
*/
I915_WRITE(INSTPM, (1 << 5) | (1 << 21));
return 0;
}
void i915_driver_irq_uninstall(struct drm_device * dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 temp;
if (!dev_priv)
return;
dev_priv->vblank_pipe = 0;
dev_priv->irq_enabled = 0;
I915_WRITE(HWSTAM, 0xffffffff);
I915_WRITE(IMR, 0xffffffff);
I915_WRITE(IER, 0x0);
temp = I915_READ(PIPEASTAT);
I915_WRITE(PIPEASTAT, temp);
temp = I915_READ(PIPEBSTAT);
I915_WRITE(PIPEBSTAT, temp);
temp = I915_READ(IIR);
I915_WRITE(IIR, temp);
}
Reference in New Issue View Git Blame Copy Permalink