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| author | Oded Gabbay <oded.gabbay@amd.com> | 2014-11-17 14:18:32 +0300 |
|---|---|---|
| committer | Oded Gabbay <oded.gabbay@amd.com> | 2014-11-17 14:18:32 +0300 |
| commit | 9a5634a72934a566b3e5fdb0e8f345846162f7d3 (patch) | |
| tree | 84dde270498d7911238e3a5fe07589cb5eb6a504 /drivers/gpu/drm/amd | |
| parent | f5d896bbd03a03bef436d9358599b50962095f38 (diff) | |
| download | linux-9a5634a72934a566b3e5fdb0e8f345846162f7d3.tar.xz | |
amdkfd: use schedule() in sync_with_hw
amdkfd uses cpu_relax() in its sync_with_hw() function. Because cpu_relax() is
defined as 'REP; NOP' on x86_64, it will block the CPU from servicing
IOMMU PPR requests.
This may cause a deadlock, because sync_with_hw() won't be completed
until the PPR request has been served.
Therefore, we need to use schedule() instead of cpu_relax() as it is the
minimum requirement to allow other threads to execute.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd')
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c b/drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c index 5055fc9c8731..9abac48de499 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c @@ -25,6 +25,7 @@ #include <linux/mutex.h> #include <linux/slab.h> #include <linux/printk.h> +#include <linux/sched.h> #include "kfd_kernel_queue.h" #include "kfd_priv.h" #include "kfd_device_queue_manager.h" @@ -274,7 +275,7 @@ static int sync_with_hw(struct kernel_queue *kq, unsigned long timeout_ms) *kq->wptr_kernel, *kq->rptr_kernel); return -ETIME; } - cpu_relax(); + schedule(); } return 0; |