From patchwork Mon Sep 14 20:00:18 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Gamari X-Patchwork-Id: 47378 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n8EK0fV6016217 for ; Mon, 14 Sep 2009 20:00:41 GMT Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E2DFE9F4E7; Mon, 14 Sep 2009 13:00:40 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mail-qy0-f202.google.com (mail-qy0-f202.google.com [209.85.221.202]) by gabe.freedesktop.org (Postfix) with ESMTP id 88EE29F4BE for ; Mon, 14 Sep 2009 13:00:36 -0700 (PDT) Received: by mail-qy0-f202.google.com with SMTP id 40so2701527qyk.8 for ; Mon, 14 Sep 2009 13:00:36 -0700 (PDT) Received: by 10.224.99.134 with SMTP id u6mr5637173qan.184.1252958436185; Mon, 14 Sep 2009 13:00:36 -0700 (PDT) Received: from localhost.localdomain ([128.119.194.104]) by mx.google.com with ESMTPS id 23sm2080521qyk.15.2009.09.14.13.00.34 (version=SSLv3 cipher=RC4-MD5); Mon, 14 Sep 2009 13:00:35 -0700 (PDT) From: Ben Gamari To: Jesse Barnes , Chris Wilson Date: Mon, 14 Sep 2009 16:00:18 -0400 Message-Id: <1252958419-7613-6-git-send-email-bgamari.foss@gmail.com> X-Mailer: git-send-email 1.6.3.3 In-Reply-To: <1252958419-7613-5-git-send-email-bgamari.foss@gmail.com> References: <1252958419-7613-1-git-send-email-bgamari.foss@gmail.com> <1252958419-7613-2-git-send-email-bgamari.foss@gmail.com> <1252958419-7613-3-git-send-email-bgamari.foss@gmail.com> <1252958419-7613-4-git-send-email-bgamari.foss@gmail.com> <1252958419-7613-5-git-send-email-bgamari.foss@gmail.com> Cc: intel-gfx@lists.freedesktop.org, "Owain G. Ainsworth" Subject: [Intel-gfx] [PATCH 5/7] drm/i915: Implement GPU reset on i965 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org This patch puts in place the machinery to attempt to reset the GPU. This will be used when attempting to recover from a GPU hang. Signed-off-by: Jesse Barnes Signed-off-by: Owain G. Ainsworth Signed-off-by: Ben Gamari --- drivers/gpu/drm/i915/i915_dma.c | 8 +++ drivers/gpu/drm/i915/i915_drv.c | 124 +++++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_irq.c | 8 +++ drivers/gpu/drm/i915/i915_reg.h | 4 + 5 files changed, 145 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index aabe41b..25f8e75 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1173,6 +1173,9 @@ static int i915_load_modeset_init(struct drm_device *dev, drm_mm_init(&dev_priv->vram, 0, prealloc_size); DRM_INFO("set up %ldM of stolen space\n", prealloc_size / (1024*1024)); + /* We're off and running w/KMS */ + dev_priv->mm.suspended = 0; + /* Let GEM Manage from end of prealloc space to end of aperture. * * However, leave one page at the end still bound to the scratch page. @@ -1184,7 +1187,9 @@ static int i915_load_modeset_init(struct drm_device *dev, */ i915_gem_do_init(dev, prealloc_size, agp_size - 4096); + mutex_lock(&dev->struct_mutex); ret = i915_gem_init_ringbuffer(dev); + mutex_unlock(&dev->struct_mutex); if (ret) goto out; @@ -1433,6 +1438,9 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) return ret; } + /* Start out suspended */ + dev_priv->mm.suspended = 1; + if (drm_core_check_feature(dev, DRIVER_MODESET)) { ret = i915_load_modeset_init(dev, prealloc_start, prealloc_size, agp_size); diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index dbe568c..435082e 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -127,6 +127,130 @@ static int i915_resume(struct drm_device *dev) return ret; } +/** + * i965_reset - reset chip after a hang + * @dev: drm device to reset + * @flags: reset domains + * + * Reset the chip. Useful if a hang is detected. Returns zero on successful + * reset or otherwise an error code. + * + * Procedure is fairly simple: + * - reset the chip using the reset reg + * - re-init context state + * - re-init hardware status page + * - re-init ring buffer + * - re-init interrupt state + * - re-init display + */ +int i965_reset(struct drm_device *dev, u8 flags) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + unsigned long timeout; + u8 gdrst; + /* + * We really should only reset the display subsystem if we actually + * need to + */ + bool need_display = true; + + mutex_lock(&dev->struct_mutex); + + /* + * Clear request list + */ + i915_gem_retire_requests(dev); + + if (need_display) + i915_save_display(dev); + + if (IS_I965G(dev) || IS_G4X(dev)) { + /* + * Set the domains we want to reset, then the reset bit (bit 0). + * Clear the reset bit after a while and wait for hardware status + * bit (bit 1) to be set + */ + pci_read_config_byte(dev->pdev, GDRST, &gdrst); + pci_write_config_byte(dev->pdev, GDRST, gdrst | flags | ((flags == GDRST_FULL) ? 0x1 : 0x0)); + udelay(50); + pci_write_config_byte(dev->pdev, GDRST, gdrst & 0xfe); + + /* ...we don't want to loop forever though, 500ms should be plenty */ + timeout = jiffies + msecs_to_jiffies(500); + do { + udelay(100); + pci_read_config_byte(dev->pdev, GDRST, &gdrst); + } while ((gdrst & 0x1) && time_after(timeout, jiffies)); + + if (gdrst & 0x1) { + WARN(true, "i915: Failed to reset chip\n"); + mutex_unlock(&dev->struct_mutex); + return -EIO; + } + } else { + DRM_ERROR("Error occurred. Don't know how to reset this chip.\n"); + return -ENODEV; + } + + /* Ok, now get things going again... */ + + /* + * Everything depends on having the GTT running, so we need to start + * there. Fortunately we don't need to do this unless we reset the + * chip at a PCI level. + * + * Next we need to restore the context, but we don't use those + * yet either... + * + * Ring buffer needs to be re-initialized in the KMS case, or if X + * was running at the time of the reset (i.e. we weren't VT + * switched away). + */ + if (drm_core_check_feature(dev, DRIVER_MODESET) || + !dev_priv->mm.suspended) { + drm_i915_ring_buffer_t *ring = &dev_priv->ring; + struct drm_gem_object *obj = ring->ring_obj; + struct drm_i915_gem_object *obj_priv = obj->driver_private; + dev_priv->mm.suspended = 0; + + /* Stop the ring if it's running. */ + I915_WRITE(PRB0_CTL, 0); + I915_WRITE(PRB0_TAIL, 0); + I915_WRITE(PRB0_HEAD, 0); + + /* Initialize the ring. */ + I915_WRITE(PRB0_START, obj_priv->gtt_offset); + I915_WRITE(PRB0_CTL, + ((obj->size - 4096) & RING_NR_PAGES) | + RING_NO_REPORT | + RING_VALID); + if (!drm_core_check_feature(dev, DRIVER_MODESET)) + i915_kernel_lost_context(dev); + else { + ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR; + ring->tail = I915_READ(PRB0_TAIL) & TAIL_ADDR; + ring->space = ring->head - (ring->tail + 8); + if (ring->space < 0) + ring->space += ring->Size; + } + + mutex_unlock(&dev->struct_mutex); + drm_irq_uninstall(dev); + drm_irq_install(dev); + mutex_lock(&dev->struct_mutex); + } + + /* + * Display needs restore too... + */ + if (need_display) + i915_restore_display(dev); + + mutex_unlock(&dev->struct_mutex); + return 0; +} + + static int __devinit i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index afbcaa9..42142f2 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -624,6 +624,7 @@ extern long i915_compat_ioctl(struct file *filp, unsigned int cmd, extern int i915_emit_box(struct drm_device *dev, struct drm_clip_rect *boxes, int i, int DR1, int DR4); +extern int i965_reset(struct drm_device *dev, u8 flags); /* i915_irq.c */ void i915_hangcheck_elapsed(unsigned long data); diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 8e982cc..58f43d2 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -482,6 +482,14 @@ static void i915_handle_error(struct drm_device *dev) I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT); } + if (dev_priv->mm.wedged) { + /* + * Wakeup waiting processes so they don't hang + */ + printk("i915: Waking up sleeping processes\n"); + DRM_WAKEUP(&dev_priv->irq_queue); + } + queue_work(dev_priv->wq, &dev_priv->error_work); } diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index f7c2de8..99981a0 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -85,6 +85,10 @@ #define I915_GC_RENDER_CLOCK_200_MHZ (1 << 0) #define I915_GC_RENDER_CLOCK_333_MHZ (4 << 0) #define LBB 0xf4 +#define GDRST 0xc0 +#define GDRST_FULL (0<<2) +#define GDRST_RENDER (1<<2) +#define GDRST_MEDIA (3<<2) /* VGA stuff */