radeon: Fix system hang issue when using KMS with older cards

commit e49f3959a96dc279860af7e86e6dbcfda50580a5 upstream.

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

Signed-off-by: Adis Hamzić <adis@hamzadis.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 0ea6bdf5fd7c8d5ac77089d1704c13907d6b8bd3..75312603aa1f733e772d3131a79665b5584951cf 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -3728,6 +3728,12 @@ static int evergreen_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);
@@ -3876,10 +3882,6 @@ 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 0a32d89e627add89609adb7bf68db51b66d176d5..d7968b8c92e199a04eea97e4eb9f646a7efa4a71 100644 (file)
--- a/drivers/gpu/drm/radeon/ni.c
+++ b/drivers/gpu/drm/radeon/ni.c
@@ -1711,6 +1711,12 @@ 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);
@@ -1857,10 +1863,6 @@ 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 4973bff37fec8ae9d5974a6f8e4f63811ee914f5..d0314ecbd7c18ecbd0f250b48efb3023eaf2d3ae 100644 (file)
--- 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 */
@@ -4022,9 +4028,6 @@ int r100_init(struct radeon_device *rdev)
        r100_mc_init(rdev);
        /* Fence driver */
        r = radeon_fence_driver_init(rdev);
-       if (r)
-               return r;
-       r = radeon_irq_kms_init(rdev);
        if (r)
                return r;
        /* Memory manager */

diff --git a/drivers/gpu/drm/radeon/r300.c b/drivers/gpu/drm/radeon/r300.c
index c60350e6872ddebdb5bc1bd923f6b2d4d6bc59fd..b9b776f1e5822cac4a2bc563bcbea886097ce9e6 100644 (file)
--- 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 */
@@ -1514,9 +1520,6 @@ int r300_init(struct radeon_device *rdev)
        r300_mc_init(rdev);
        /* Fence driver */
        r = radeon_fence_driver_init(rdev);
-       if (r)
-               return r;
-       r = radeon_irq_kms_init(rdev);
        if (r)
                return r;
        /* Memory manager */

diff --git a/drivers/gpu/drm/radeon/r420.c b/drivers/gpu/drm/radeon/r420.c
index 6fce2eb4dd16b3269625c43ec767c634685ec63a..4e796ecf9ea4770e2388a56032cd135f5e861605 100644 (file)
--- 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 f795a4e092cb724374e5440775f37a37a87373d1..e1aece73b370c1ec9d6d9f86273caad0cbb14d36 100644 (file)
--- 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 */
@@ -295,9 +301,6 @@ int r520_init(struct radeon_device *rdev)
        rv515_debugfs(rdev);
        /* Fence driver */
        r = radeon_fence_driver_init(rdev);
-       if (r)
-               return r;
-       r = radeon_irq_kms_init(rdev);
        if (r)
                return r;
        /* Memory manager */

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 0740db3fcd2268af78e286ec6ec634570ff7efcd..aa3066a173a7ce35c09ad6fb7eea78d83a839883 100644 (file)
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -2940,6 +2940,12 @@ 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);
@@ -3094,10 +3100,6 @@ 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 73051ce3121ee480a770b3f697289d35e0fd46e0..233a9b9fa1f7a4dde360a30559f902a2d81d0555 100644 (file)
--- 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 */
@@ -533,9 +539,6 @@ int rs400_init(struct radeon_device *rdev)
        rs400_mc_init(rdev);
        /* Fence driver */
        r = radeon_fence_driver_init(rdev);
-       if (r)
-               return r;
-       r = radeon_irq_kms_init(rdev);
        if (r)
                return r;
        /* Memory manager */

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 46fa1b07c5602388581bed64cc9bc5ea6065a35c..670b555d2ca229c3b39ac46cbbbf8e06e678f25b 100644 (file)
--- 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 */
@@ -1045,9 +1051,6 @@ int rs600_init(struct radeon_device *rdev)
        rs600_debugfs(rdev);
        /* Fence driver */
        r = radeon_fence_driver_init(rdev);
-       if (r)
-               return r;
-       r = radeon_irq_kms_init(rdev);
        if (r)
                return r;
        /* Memory manager */

diff --git a/drivers/gpu/drm/radeon/rs690.c b/drivers/gpu/drm/radeon/rs690.c
index 5706d2ac75ab1c4498e810f10edcfcb7e3649a2a..fad6633dce39638e32f8f0bb2981040eff28dabf 100644 (file)
--- a/drivers/gpu/drm/radeon/rs690.c
+++ b/drivers/gpu/drm/radeon/rs690.c
@@ -628,6 +628,12 @@ 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 */
@@ -751,9 +757,6 @@ int rs690_init(struct radeon_device *rdev)
        rv515_debugfs(rdev);
        /* Fence driver */
        r = radeon_fence_driver_init(rdev);
-       if (r)
-               return r;
-       r = radeon_irq_kms_init(rdev);
        if (r)
                return r;
        /* Memory manager */

diff --git a/drivers/gpu/drm/radeon/rv515.c b/drivers/gpu/drm/radeon/rv515.c
index ffcba730c57cb3172a4084d696d1cc70e9ec0adf..21c7d7b26e55547da60fa5dbe12818f11ae6f3bd 100644 (file)
--- 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 */
@@ -660,9 +666,6 @@ int rv515_init(struct radeon_device *rdev)
        rv515_debugfs(rdev);
        /* Fence driver */
        r = radeon_fence_driver_init(rdev);
-       if (r)
-               return r;
-       r = radeon_irq_kms_init(rdev);
        if (r)
                return r;
        /* Memory manager */

diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index d63fe1d0f53f9ab42c1da269c9e2f72f5fbc8763..4181053cc94faa5d657569b3e16e051c6e601a69 100644 (file)
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -1041,6 +1041,12 @@ static int rv770_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);
@@ -1180,10 +1186,6 @@ 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 aefefd5000ee54928eb01d7f93aa3894526527ca..a964a967959f9c6e1045f10af510f8bf58e4dd6e 100644 (file)
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -4374,6 +4374,12 @@ 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);
@@ -4534,10 +4540,6 @@ 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);