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Date: Mon, 3 Jun 2013 10:20:24 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Adis Hamzić <adis@...zadis.com>
Cc: David Airlie <airlied@...ux.ie>,
Alex Deucher <alexander.deucher@....com>,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/1] radeon: Fix system hang issue when using KMS with
older cards
On Sun, Jun 2, 2013 at 10:47 AM, Adis Hamzić <adis@...zadis.com> wrote:
> The current radeon driver initialization routines, when using KMS, are written
> so that the IRQ installation routine is called before initializing the WB buffer
> and the CP rings. With some ASICs, though, the IRQ routine tries to access the
> GFX_INDEX ring causing a call to RREG32 with the value of -1 in
> radeon_fence_read. This, in turn causes the system to completely hang with some
> cards, requiring a hard reset.
>
> A call stack that can cause such a hang looks like this (using rv515 ASIC for the
> example here):
> * rv515_init (rv515.c)
> * radeon_irq_kms_init (radeon_irq_kms.c)
> * drm_irq_install (drm_irq.c)
> * radeon_driver_irq_preinstall_kms (radeon_irq_kms.c)
> * rs600_irq_process (rs600.c)
> * radeon_fence_process - due to SW interrupt (radeon_fence.c)
> * radeon_fence_read (radeon_fence.c)
> * hang due to RREG32(-1)
>
> The patch moves the IRQ installation to the card startup routine, after the ring
> has been initialized, but before the IRQ has been set. This fixes the issue, but
> requires a check to see if the IRQ is already installed, as is the case in the
> system resume codepath.
> I have tested the patch on three machines using the rv515, the rv770 and the
> evergreen ASIC. They worked without issues.
>
> This seems to be a known issue and has been reported on several bug tracking
> sites by various distributions (see links below). Most of reports recommend
> booting the system with KMS disabled and then enabling KMS by reloading the
> radeon module. For some reason, this was indeed a usable workaround, however,
> UMS is now deprecated and disabled by default.
>
> Bug reports:
> https://bugzilla.redhat.com/show_bug.cgi?id=845745
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/561789
> https://bbs.archlinux.org/viewtopic.php?id=156964
Thanks for tracking this down. I've applied it to my fixes tree.
Alex
>
> Signed-off-by: Adis Hamzić <adis@...zadis.com>
> ---
> drivers/gpu/drm/radeon/evergreen.c | 10 ++++++----
> drivers/gpu/drm/radeon/ni.c | 10 ++++++----
> drivers/gpu/drm/radeon/r100.c | 9 ++++++---
> drivers/gpu/drm/radeon/r300.c | 9 ++++++---
> drivers/gpu/drm/radeon/r420.c | 10 ++++++----
> drivers/gpu/drm/radeon/r520.c | 9 ++++++---
> drivers/gpu/drm/radeon/r600.c | 10 ++++++----
> drivers/gpu/drm/radeon/rs400.c | 9 ++++++---
> drivers/gpu/drm/radeon/rs600.c | 9 ++++++---
> drivers/gpu/drm/radeon/rs690.c | 9 ++++++---
> drivers/gpu/drm/radeon/rv515.c | 9 ++++++---
> drivers/gpu/drm/radeon/rv770.c | 10 ++++++----
> drivers/gpu/drm/radeon/si.c | 10 ++++++----
> 13 files changed, 78 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
> index 8546e3b..0f89ce3 100644
> --- a/drivers/gpu/drm/radeon/evergreen.c
> +++ b/drivers/gpu/drm/radeon/evergreen.c
> @@ -4754,6 +4754,12 @@ static int evergreen_startup(struct radeon_device *rdev)
> rdev->ring[R600_RING_TYPE_UVD_INDEX].ring_size = 0;
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r = r600_irq_init(rdev);
> if (r) {
> DRM_ERROR("radeon: IH init failed (%d).\n", r);
> @@ -4923,10 +4929,6 @@ int evergreen_init(struct radeon_device *rdev)
> if (r)
> return r;
>
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> -
> rdev->ring[RADEON_RING_TYPE_GFX_INDEX].ring_obj = NULL;
> r600_ring_init(rdev, &rdev->ring[RADEON_RING_TYPE_GFX_INDEX], 1024 * 1024);
>
> diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
> index 7969c0c..8458330 100644
> --- a/drivers/gpu/drm/radeon/ni.c
> +++ b/drivers/gpu/drm/radeon/ni.c
> @@ -2025,6 +2025,12 @@ static int cayman_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r = r600_irq_init(rdev);
> if (r) {
> DRM_ERROR("radeon: IH init failed (%d).\n", r);
> @@ -2190,10 +2196,6 @@ int cayman_init(struct radeon_device *rdev)
> if (r)
> return r;
>
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> -
> ring->ring_obj = NULL;
> r600_ring_init(rdev, ring, 1024 * 1024);
>
> diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
> index 4973bff..d0314ec 100644
> --- a/drivers/gpu/drm/radeon/r100.c
> +++ b/drivers/gpu/drm/radeon/r100.c
> @@ -3869,6 +3869,12 @@ static int r100_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r100_irq_set(rdev);
> rdev->config.r100.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
> /* 1M ring buffer */
> @@ -4024,9 +4030,6 @@ int r100_init(struct radeon_device *rdev)
> r = radeon_fence_driver_init(rdev);
> if (r)
> return r;
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> /* Memory manager */
> r = radeon_bo_init(rdev);
> if (r)
> diff --git a/drivers/gpu/drm/radeon/r300.c b/drivers/gpu/drm/radeon/r300.c
> index c60350e..b9b776f 100644
> --- a/drivers/gpu/drm/radeon/r300.c
> +++ b/drivers/gpu/drm/radeon/r300.c
> @@ -1382,6 +1382,12 @@ static int r300_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r100_irq_set(rdev);
> rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
> /* 1M ring buffer */
> @@ -1516,9 +1522,6 @@ int r300_init(struct radeon_device *rdev)
> r = radeon_fence_driver_init(rdev);
> if (r)
> return r;
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> /* Memory manager */
> r = radeon_bo_init(rdev);
> if (r)
> diff --git a/drivers/gpu/drm/radeon/r420.c b/drivers/gpu/drm/radeon/r420.c
> index 6fce2eb..4e796ec 100644
> --- a/drivers/gpu/drm/radeon/r420.c
> +++ b/drivers/gpu/drm/radeon/r420.c
> @@ -265,6 +265,12 @@ static int r420_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r100_irq_set(rdev);
> rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
> /* 1M ring buffer */
> @@ -411,10 +417,6 @@ int r420_init(struct radeon_device *rdev)
> if (r) {
> return r;
> }
> - r = radeon_irq_kms_init(rdev);
> - if (r) {
> - return r;
> - }
> /* Memory manager */
> r = radeon_bo_init(rdev);
> if (r) {
> diff --git a/drivers/gpu/drm/radeon/r520.c b/drivers/gpu/drm/radeon/r520.c
> index f795a4e..e1aece7 100644
> --- a/drivers/gpu/drm/radeon/r520.c
> +++ b/drivers/gpu/drm/radeon/r520.c
> @@ -194,6 +194,12 @@ static int r520_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> rs600_irq_set(rdev);
> rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
> /* 1M ring buffer */
> @@ -297,9 +303,6 @@ int r520_init(struct radeon_device *rdev)
> r = radeon_fence_driver_init(rdev);
> if (r)
> return r;
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> /* Memory manager */
> r = radeon_bo_init(rdev);
> if (r)
> diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
> index b45e648..0f30d0d 100644
> --- a/drivers/gpu/drm/radeon/r600.c
> +++ b/drivers/gpu/drm/radeon/r600.c
> @@ -3202,6 +3202,12 @@ static int r600_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r = r600_irq_init(rdev);
> if (r) {
> DRM_ERROR("radeon: IH init failed (%d).\n", r);
> @@ -3356,10 +3362,6 @@ int r600_init(struct radeon_device *rdev)
> if (r)
> return r;
>
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> -
> rdev->ring[RADEON_RING_TYPE_GFX_INDEX].ring_obj = NULL;
> r600_ring_init(rdev, &rdev->ring[RADEON_RING_TYPE_GFX_INDEX], 1024 * 1024);
>
> diff --git a/drivers/gpu/drm/radeon/rs400.c b/drivers/gpu/drm/radeon/rs400.c
> index 73051ce..233a9b9 100644
> --- a/drivers/gpu/drm/radeon/rs400.c
> +++ b/drivers/gpu/drm/radeon/rs400.c
> @@ -417,6 +417,12 @@ static int rs400_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r100_irq_set(rdev);
> rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
> /* 1M ring buffer */
> @@ -535,9 +541,6 @@ int rs400_init(struct radeon_device *rdev)
> r = radeon_fence_driver_init(rdev);
> if (r)
> return r;
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> /* Memory manager */
> r = radeon_bo_init(rdev);
> if (r)
> diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
> index 46fa1b0..670b555 100644
> --- a/drivers/gpu/drm/radeon/rs600.c
> +++ b/drivers/gpu/drm/radeon/rs600.c
> @@ -923,6 +923,12 @@ static int rs600_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> rs600_irq_set(rdev);
> rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
> /* 1M ring buffer */
> @@ -1047,9 +1053,6 @@ int rs600_init(struct radeon_device *rdev)
> r = radeon_fence_driver_init(rdev);
> if (r)
> return r;
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> /* Memory manager */
> r = radeon_bo_init(rdev);
> if (r)
> diff --git a/drivers/gpu/drm/radeon/rs690.c b/drivers/gpu/drm/radeon/rs690.c
> index ab4c86c..55880d5 100644
> --- a/drivers/gpu/drm/radeon/rs690.c
> +++ b/drivers/gpu/drm/radeon/rs690.c
> @@ -651,6 +651,12 @@ static int rs690_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> rs600_irq_set(rdev);
> rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
> /* 1M ring buffer */
> @@ -776,9 +782,6 @@ int rs690_init(struct radeon_device *rdev)
> r = radeon_fence_driver_init(rdev);
> if (r)
> return r;
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> /* Memory manager */
> r = radeon_bo_init(rdev);
> if (r)
> diff --git a/drivers/gpu/drm/radeon/rv515.c b/drivers/gpu/drm/radeon/rv515.c
> index ffcba73..21c7d7b 100644
> --- a/drivers/gpu/drm/radeon/rv515.c
> +++ b/drivers/gpu/drm/radeon/rv515.c
> @@ -532,6 +532,12 @@ static int rv515_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> rs600_irq_set(rdev);
> rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
> /* 1M ring buffer */
> @@ -662,9 +668,6 @@ int rv515_init(struct radeon_device *rdev)
> r = radeon_fence_driver_init(rdev);
> if (r)
> return r;
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> /* Memory manager */
> r = radeon_bo_init(rdev);
> if (r)
> diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
> index 08aef24..4a62ad2 100644
> --- a/drivers/gpu/drm/radeon/rv770.c
> +++ b/drivers/gpu/drm/radeon/rv770.c
> @@ -1887,6 +1887,12 @@ static int rv770_startup(struct radeon_device *rdev)
> rdev->ring[R600_RING_TYPE_UVD_INDEX].ring_size = 0;
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r = r600_irq_init(rdev);
> if (r) {
> DRM_ERROR("radeon: IH init failed (%d).\n", r);
> @@ -2045,10 +2051,6 @@ int rv770_init(struct radeon_device *rdev)
> if (r)
> return r;
>
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> -
> rdev->ring[RADEON_RING_TYPE_GFX_INDEX].ring_obj = NULL;
> r600_ring_init(rdev, &rdev->ring[RADEON_RING_TYPE_GFX_INDEX], 1024 * 1024);
>
> diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
> index d1ba9d8..a1b0da6 100644
> --- a/drivers/gpu/drm/radeon/si.c
> +++ b/drivers/gpu/drm/radeon/si.c
> @@ -5350,6 +5350,12 @@ static int si_startup(struct radeon_device *rdev)
> }
>
> /* Enable IRQ */
> + if (!rdev->irq.installed) {
> + r = radeon_irq_kms_init(rdev);
> + if (r)
> + return r;
> + }
> +
> r = si_irq_init(rdev);
> if (r) {
> DRM_ERROR("radeon: IH init failed (%d).\n", r);
> @@ -5533,10 +5539,6 @@ int si_init(struct radeon_device *rdev)
> if (r)
> return r;
>
> - r = radeon_irq_kms_init(rdev);
> - if (r)
> - return r;
> -
> ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];
> ring->ring_obj = NULL;
> r600_ring_init(rdev, ring, 1024 * 1024);
> --
> 1.8.3
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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