kernel_optimize_test/drivers/gpu/drm/i915/i915_irq.c

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/* 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_ASLE_INTERRUPT | \
I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \
I915_DISPLAY_PIPE_B_EVENT_INTERRUPT)
void
i915_enable_irq(drm_i915_private_t *dev_priv, u32 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, u32 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_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;
}
/* Called from drm generic code, passed a 'crtc', which
* we use as a pipe index
*/
u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
{
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;
high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
if (!i915_pipe_enabled(dev, pipe)) {
DRM_ERROR("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, pipeb_stats;
int vblank = 0;
atomic_inc(&dev_priv->irq_received);
if (dev->pdev->msi_enabled)
I915_WRITE(IMR, ~0);
iir = I915_READ(IIR);
if (iir == 0) {
if (dev->pdev->msi_enabled) {
I915_WRITE(IMR, dev_priv->irq_mask_reg);
(void) I915_READ(IMR);
}
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);
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, 0);
}
I915_WRITE(PIPEASTAT, pipea_stats);
}
if (iir & I915_DISPLAY_PIPE_B_EVENT_INTERRUPT) {
pipeb_stats = I915_READ(PIPEBSTAT);
/* Ack the event */
I915_WRITE(PIPEBSTAT, pipeb_stats);
/* 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, 1);
}
if (pipeb_stats & I915_LEGACY_BLC_EVENT_STATUS)
opregion_asle_intr(dev);
I915_WRITE(PIPEBSTAT, pipeb_stats);
}
I915_WRITE(IIR, iir);
if (dev->pdev->msi_enabled)
I915_WRITE(IMR, dev_priv->irq_mask_reg);
(void) I915_READ(IIR); /* Flush posted writes */
if (dev_priv->sarea_priv)
dev_priv->sarea_priv->last_dispatch =
READ_BREADCRUMB(dev_priv);
if (iir & I915_USER_INTERRUPT) {
dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
DRM_WAKEUP(&dev_priv->irq_queue);
}
if (iir & I915_ASLE_INTERRUPT)
opregion_asle_intr(dev);
return IRQ_HANDLED;
}
static 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");
dev_priv->counter++;
if (dev_priv->counter > 0x7FFFFFFFUL)
dev_priv->counter = 1;
if (dev_priv->sarea_priv)
dev_priv->sarea_priv->last_enqueue = dev_priv->counter;
BEGIN_LP_RING(6);
OUT_RING(MI_STORE_DWORD_INDEX);
OUT_RING(5 << MI_STORE_DWORD_INDEX_SHIFT);
OUT_RING(dev_priv->counter);
OUT_RING(0);
OUT_RING(0);
OUT_RING(MI_USER_INTERRUPT);
ADVANCE_LP_RING();
return dev_priv->counter;
}
void i915_user_irq_get(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
unsigned long irqflags;
spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
if (dev->irq_enabled && (++dev_priv->user_irq_refcount == 1))
i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
}
void i915_user_irq_put(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
unsigned long irqflags;
spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
BUG_ON(dev->irq_enabled && dev_priv->user_irq_refcount <= 0);
if (dev->irq_enabled && (--dev_priv->user_irq_refcount == 0))
i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
}
static 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;
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;
}
if (dev_priv->sarea_priv)
dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
i915_user_irq_get(dev);
DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
READ_BREADCRUMB(dev_priv) >= irq_nr);
i915_user_irq_put(dev);
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;
RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
mutex_lock(&dev->struct_mutex);
result = i915_emit_irq(dev);
mutex_unlock(&dev->struct_mutex);
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);
}
/* Called from drm generic code, passed 'crtc' which
* we use as a pipe index
*/
int i915_enable_vblank(struct drm_device *dev, int pipe)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 pipestat_reg = 0;
u32 pipestat;
u32 interrupt = 0;
unsigned long irqflags;
switch (pipe) {
case 0:
pipestat_reg = PIPEASTAT;
interrupt = I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
break;
case 1:
pipestat_reg = PIPEBSTAT;
interrupt = I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
break;
default:
DRM_ERROR("tried to enable vblank on non-existent pipe %d\n",
pipe);
return 0;
}
spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
/* Enabling vblank events in IMR comes before PIPESTAT write, or
* there's a race where the PIPESTAT vblank bit gets set to 1, so
* the OR of enabled PIPESTAT bits goes to 1, so the PIPExEVENT in
* ISR flashes to 1, but the IIR bit doesn't get set to 1 because
* IMR masks it. It doesn't ever get set after we clear the masking
* in IMR because the ISR bit is edge, not level-triggered, on the
* OR of PIPESTAT bits.
*/
i915_enable_irq(dev_priv, interrupt);
pipestat = I915_READ(pipestat_reg);
if (IS_I965G(dev))
pipestat |= PIPE_START_VBLANK_INTERRUPT_ENABLE;
else
pipestat |= PIPE_VBLANK_INTERRUPT_ENABLE;
/* Clear any stale interrupt status */
pipestat |= (PIPE_START_VBLANK_INTERRUPT_STATUS |
PIPE_VBLANK_INTERRUPT_STATUS);
I915_WRITE(pipestat_reg, pipestat);
(void) I915_READ(pipestat_reg); /* Posting read */
spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
return 0;
}
/* Called from drm generic code, passed 'crtc' which
* we use as a pipe index
*/
void i915_disable_vblank(struct drm_device *dev, int pipe)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 pipestat_reg = 0;
u32 pipestat;
u32 interrupt = 0;
unsigned long irqflags;
switch (pipe) {
case 0:
pipestat_reg = PIPEASTAT;
interrupt = I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
break;
case 1:
pipestat_reg = PIPEBSTAT;
interrupt = I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
break;
default:
DRM_ERROR("tried to disable vblank on non-existent pipe %d\n",
pipe);
return;
break;
}
spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
i915_disable_irq(dev_priv, interrupt);
pipestat = I915_READ(pipestat_reg);
pipestat &= ~(PIPE_START_VBLANK_INTERRUPT_ENABLE |
PIPE_VBLANK_INTERRUPT_ENABLE);
/* Clear any stale interrupt status */
pipestat |= (PIPE_START_VBLANK_INTERRUPT_STATUS |
PIPE_VBLANK_INTERRUPT_STATUS);
I915_WRITE(pipestat_reg, pipestat);
(void) I915_READ(pipestat_reg); /* Posting read */
spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
}
/* 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;
/* Set initial unmasked IRQs to just the selected vblank pipes. */
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_priv->irq_mask_reg &= ~I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT;
dev_priv->irq_mask_reg &= ~I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
dev_priv->irq_mask_reg &= I915_INTERRUPT_ENABLE_MASK;
I915_WRITE(IMR, dev_priv->irq_mask_reg);
I915_WRITE(IER, I915_INTERRUPT_ENABLE_MASK);
(void) I915_READ(IER);
opregion_enable_asle(dev);
DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
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;
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);
}