560 lines
15 KiB
C
560 lines
15 KiB
C
/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
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*/
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/*-
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* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "dev/drm/drmP.h"
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#include "dev/drm/drm.h"
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#include "dev/drm/i915_drm.h"
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#include "dev/drm/i915_drv.h"
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#define MAX_NOPID ((u32)~0)
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/**
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* Interrupts that are always left unmasked.
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*
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* Since pipe events are edge-triggered from the PIPESTAT register to IIR,
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* we leave them always unmasked in IMR and then control enabling them through
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* PIPESTAT alone.
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*/
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#define I915_INTERRUPT_ENABLE_FIX (I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \
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I915_DISPLAY_PIPE_B_EVENT_INTERRUPT)
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/** Interrupts that we mask and unmask at runtime. */
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#define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT)
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/** These are all of the interrupts used by the driver */
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#define I915_INTERRUPT_ENABLE_MASK (I915_INTERRUPT_ENABLE_FIX | \
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I915_INTERRUPT_ENABLE_VAR)
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#define I915_PIPE_VBLANK_STATUS (PIPE_START_VBLANK_INTERRUPT_STATUS |\
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PIPE_VBLANK_INTERRUPT_STATUS)
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#define I915_PIPE_VBLANK_ENABLE (PIPE_START_VBLANK_INTERRUPT_ENABLE |\
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PIPE_VBLANK_INTERRUPT_ENABLE)
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#define DRM_I915_VBLANK_PIPE_ALL (DRM_I915_VBLANK_PIPE_A | \
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DRM_I915_VBLANK_PIPE_B)
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static inline void
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i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
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{
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mask &= I915_INTERRUPT_ENABLE_VAR;
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if ((dev_priv->irq_mask_reg & mask) != 0) {
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dev_priv->irq_mask_reg &= ~mask;
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I915_WRITE(IMR, dev_priv->irq_mask_reg);
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(void) I915_READ(IMR);
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}
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}
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static inline void
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i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
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{
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mask &= I915_INTERRUPT_ENABLE_VAR;
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if ((dev_priv->irq_mask_reg & mask) != mask) {
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dev_priv->irq_mask_reg |= mask;
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I915_WRITE(IMR, dev_priv->irq_mask_reg);
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(void) I915_READ(IMR);
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}
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}
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static inline u32
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i915_pipestat(int pipe)
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{
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if (pipe == 0)
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return PIPEASTAT;
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if (pipe == 1)
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return PIPEBSTAT;
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return -EINVAL;
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}
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void
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i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
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{
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if ((dev_priv->pipestat[pipe] & mask) != mask) {
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u32 reg = i915_pipestat(pipe);
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dev_priv->pipestat[pipe] |= mask;
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/* Enable the interrupt, clear any pending status */
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I915_WRITE(reg, dev_priv->pipestat[pipe] | (mask >> 16));
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(void) I915_READ(reg);
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}
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}
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void
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i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
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{
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if ((dev_priv->pipestat[pipe] & mask) != 0) {
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u32 reg = i915_pipestat(pipe);
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dev_priv->pipestat[pipe] &= ~mask;
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I915_WRITE(reg, dev_priv->pipestat[pipe]);
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(void) I915_READ(reg);
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}
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}
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/**
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* i915_pipe_enabled - check if a pipe is enabled
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* @dev: DRM device
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* @pipe: pipe to check
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*
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* Reading certain registers when the pipe is disabled can hang the chip.
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* Use this routine to make sure the PLL is running and the pipe is active
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* before reading such registers if unsure.
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*/
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static int
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i915_pipe_enabled(struct drm_device *dev, int pipe)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
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if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
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return 1;
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return 0;
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}
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/* Called from drm generic code, passed a 'crtc', which
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* we use as a pipe index
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*/
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u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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unsigned long high_frame;
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unsigned long low_frame;
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u32 high1, high2, low, count;
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high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
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low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
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if (!i915_pipe_enabled(dev, pipe)) {
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DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
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return 0;
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}
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/*
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* High & low register fields aren't synchronized, so make sure
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* we get a low value that's stable across two reads of the high
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* register.
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*/
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do {
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high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
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PIPE_FRAME_HIGH_SHIFT);
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low = ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
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PIPE_FRAME_LOW_SHIFT);
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high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
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PIPE_FRAME_HIGH_SHIFT);
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} while (high1 != high2);
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count = (high1 << 8) | low;
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return count;
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}
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u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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int reg = pipe ? PIPEB_FRMCOUNT_GM45 : PIPEA_FRMCOUNT_GM45;
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if (!i915_pipe_enabled(dev, pipe)) {
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DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
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return 0;
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}
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return I915_READ(reg);
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}
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irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
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{
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struct drm_device *dev = (struct drm_device *) arg;
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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u32 iir, new_iir;
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u32 pipea_stats, pipeb_stats;
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u32 vblank_status;
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u32 vblank_enable;
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int irq_received;
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atomic_inc(&dev_priv->irq_received);
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iir = I915_READ(IIR);
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if (IS_I965G(dev)) {
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vblank_status = I915_START_VBLANK_INTERRUPT_STATUS;
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vblank_enable = PIPE_START_VBLANK_INTERRUPT_ENABLE;
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} else {
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vblank_status = I915_VBLANK_INTERRUPT_STATUS;
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vblank_enable = I915_VBLANK_INTERRUPT_ENABLE;
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}
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for (;;) {
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irq_received = iir != 0;
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/* Can't rely on pipestat interrupt bit in iir as it might
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* have been cleared after the pipestat interrupt was received.
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* It doesn't set the bit in iir again, but it still produces
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* interrupts (for non-MSI).
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*/
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DRM_SPINLOCK(&dev_priv->user_irq_lock);
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pipea_stats = I915_READ(PIPEASTAT);
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pipeb_stats = I915_READ(PIPEBSTAT);
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/*
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* Clear the PIPE(A|B)STAT regs before the IIR
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*/
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if (pipea_stats & 0x8000ffff) {
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I915_WRITE(PIPEASTAT, pipea_stats);
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irq_received = 1;
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}
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if (pipeb_stats & 0x8000ffff) {
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I915_WRITE(PIPEBSTAT, pipeb_stats);
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irq_received = 1;
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}
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DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
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if (!irq_received)
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break;
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I915_WRITE(IIR, iir);
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new_iir = I915_READ(IIR); /* Flush posted writes */
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if (dev_priv->sarea_priv)
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dev_priv->sarea_priv->last_dispatch =
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READ_BREADCRUMB(dev_priv);
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if (iir & I915_USER_INTERRUPT) {
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DRM_WAKEUP(&dev_priv->irq_queue);
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}
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if (pipea_stats & vblank_status)
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drm_handle_vblank(dev, 0);
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if (pipeb_stats & vblank_status)
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drm_handle_vblank(dev, 1);
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/* With MSI, interrupts are only generated when iir
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* transitions from zero to nonzero. If another bit got
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* set while we were handling the existing iir bits, then
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* we would never get another interrupt.
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*
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* This is fine on non-MSI as well, as if we hit this path
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* we avoid exiting the interrupt handler only to generate
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* another one.
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*
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* Note that for MSI this could cause a stray interrupt report
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* if an interrupt landed in the time between writing IIR and
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* the posting read. This should be rare enough to never
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* trigger the 99% of 100,000 interrupts test for disabling
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* stray interrupts.
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*/
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iir = new_iir;
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}
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}
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static int i915_emit_irq(struct drm_device * dev)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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RING_LOCALS;
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i915_kernel_lost_context(dev);
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if (++dev_priv->counter > 0x7FFFFFFFUL)
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dev_priv->counter = 0;
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if (dev_priv->sarea_priv)
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dev_priv->sarea_priv->last_enqueue = dev_priv->counter;
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DRM_DEBUG("emitting: %d\n", dev_priv->counter);
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BEGIN_LP_RING(4);
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OUT_RING(MI_STORE_DWORD_INDEX);
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OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
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OUT_RING(dev_priv->counter);
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OUT_RING(MI_USER_INTERRUPT);
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ADVANCE_LP_RING();
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return dev_priv->counter;
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}
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void i915_user_irq_get(struct drm_device *dev)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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DRM_DEBUG("\n");
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DRM_SPINLOCK(&dev_priv->user_irq_lock);
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if (dev->irq_enabled && (++dev_priv->user_irq_refcount == 1))
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i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
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DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
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}
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void i915_user_irq_put(struct drm_device *dev)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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DRM_SPINLOCK(&dev_priv->user_irq_lock);
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if (dev->irq_enabled) {
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KASSERT(dev_priv->user_irq_refcount > 0, ("invalid refcount"));
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if (--dev_priv->user_irq_refcount == 0)
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i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
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}
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DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
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}
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static int i915_wait_irq(struct drm_device * dev, int irq_nr)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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int ret = 0;
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if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
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if (dev_priv->sarea_priv) {
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dev_priv->sarea_priv->last_dispatch =
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READ_BREADCRUMB(dev_priv);
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}
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return 0;
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}
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if (dev_priv->sarea_priv)
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dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
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DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
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READ_BREADCRUMB(dev_priv));
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i915_user_irq_get(dev);
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DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
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READ_BREADCRUMB(dev_priv) >= irq_nr);
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i915_user_irq_put(dev);
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if (ret == -ERESTART)
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DRM_DEBUG("restarting syscall\n");
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if (ret == -EBUSY) {
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DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
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READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
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}
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return ret;
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}
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/* Needs the lock as it touches the ring.
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*/
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int i915_irq_emit(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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drm_i915_irq_emit_t *emit = data;
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int result;
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if (!dev_priv) {
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DRM_ERROR("called with no initialization\n");
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return -EINVAL;
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}
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RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
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result = i915_emit_irq(dev);
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if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
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DRM_ERROR("copy_to_user\n");
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return -EFAULT;
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}
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return 0;
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}
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/* Doesn't need the hardware lock.
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*/
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int i915_irq_wait(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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drm_i915_irq_wait_t *irqwait = data;
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if (!dev_priv) {
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DRM_ERROR("called with no initialization\n");
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return -EINVAL;
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}
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return i915_wait_irq(dev, irqwait->irq_seq);
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}
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/* Called from drm generic code, passed 'crtc' which
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* we use as a pipe index
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*/
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int i915_enable_vblank(struct drm_device *dev, int pipe)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
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u32 pipeconf;
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pipeconf = I915_READ(pipeconf_reg);
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if (!(pipeconf & PIPEACONF_ENABLE))
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return -EINVAL;
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DRM_SPINLOCK(&dev_priv->user_irq_lock);
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if (IS_I965G(dev))
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i915_enable_pipestat(dev_priv, pipe,
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PIPE_START_VBLANK_INTERRUPT_ENABLE);
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else
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i915_enable_pipestat(dev_priv, pipe,
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PIPE_VBLANK_INTERRUPT_ENABLE);
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DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
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return 0;
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}
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/* Called from drm generic code, passed 'crtc' which
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* we use as a pipe index
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*/
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void i915_disable_vblank(struct drm_device *dev, int pipe)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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DRM_SPINLOCK(&dev_priv->user_irq_lock);
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i915_disable_pipestat(dev_priv, pipe,
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PIPE_VBLANK_INTERRUPT_ENABLE |
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PIPE_START_VBLANK_INTERRUPT_ENABLE);
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DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
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}
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/* Set the vblank monitor pipe
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*/
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int i915_vblank_pipe_set(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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if (!dev_priv) {
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DRM_ERROR("called with no initialization\n");
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return -EINVAL;
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}
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return 0;
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}
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int i915_vblank_pipe_get(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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drm_i915_vblank_pipe_t *pipe = data;
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if (!dev_priv) {
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DRM_ERROR("called with no initialization\n");
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return -EINVAL;
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}
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pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
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return 0;
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}
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/**
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* Schedule buffer swap at given vertical blank.
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*/
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int i915_vblank_swap(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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/* The delayed swap mechanism was fundamentally racy, and has been
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* removed. The model was that the client requested a delayed flip/swap
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* from the kernel, then waited for vblank before continuing to perform
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* rendering. The problem was that the kernel might wake the client
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* up before it dispatched the vblank swap (since the lock has to be
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* held while touching the ringbuffer), in which case the client would
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* clear and start the next frame before the swap occurred, and
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* flicker would occur in addition to likely missing the vblank.
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*
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* In the absence of this ioctl, userland falls back to a correct path
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* 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;
|
|
|
|
atomic_set_int(&dev_priv->irq_received, 0);
|
|
|
|
I915_WRITE(HWSTAM, 0xeffe);
|
|
I915_WRITE(PIPEASTAT, 0);
|
|
I915_WRITE(PIPEBSTAT, 0);
|
|
I915_WRITE(IMR, 0xffffffff);
|
|
I915_WRITE(IER, 0x0);
|
|
(void) I915_READ(IER);
|
|
}
|
|
|
|
int i915_driver_irq_postinstall(struct drm_device *dev)
|
|
{
|
|
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
|
|
|
|
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 */
|
|
|
|
/* Unmask the interrupts that we always want on. */
|
|
dev_priv->irq_mask_reg = ~I915_INTERRUPT_ENABLE_FIX;
|
|
|
|
dev_priv->pipestat[0] = 0;
|
|
dev_priv->pipestat[1] = 0;
|
|
|
|
/* Disable pipe interrupt enables, clear pending pipe status */
|
|
I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
|
|
I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
|
|
|
|
/* Clear pending interrupt status */
|
|
I915_WRITE(IIR, I915_READ(IIR));
|
|
|
|
I915_WRITE(IER, I915_INTERRUPT_ENABLE_MASK);
|
|
I915_WRITE(IMR, dev_priv->irq_mask_reg);
|
|
(void) I915_READ(IER);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void i915_driver_irq_uninstall(struct drm_device * dev)
|
|
{
|
|
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
|
|
|
|
if (!dev_priv)
|
|
return;
|
|
|
|
dev_priv->vblank_pipe = 0;
|
|
|
|
I915_WRITE(HWSTAM, 0xffffffff);
|
|
I915_WRITE(PIPEASTAT, 0);
|
|
I915_WRITE(PIPEBSTAT, 0);
|
|
I915_WRITE(IMR, 0xffffffff);
|
|
I915_WRITE(IER, 0x0);
|
|
|
|
I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
|
|
I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
|
|
I915_WRITE(IIR, I915_READ(IIR));
|
|
}
|