[PATCH 13/18] drm/radeon: simplify semaphore handling v2

From: Jerome Glisse jglisse@redhat.com

Directly use the suballocator to get small chunks of memory. It's equally fast and doesn't crash when we encounter a GPU reset.

v2: rebased on new SA interface.

Signed-off-by: Christian König deathsimple@vodafone.de Signed-off-by: Jerome Glisse jglisse@redhat.com --- drivers/gpu/drm/radeon/evergreen.c | 1 - drivers/gpu/drm/radeon/ni.c | 1 - drivers/gpu/drm/radeon/r600.c | 1 - drivers/gpu/drm/radeon/radeon.h | 29 +----- drivers/gpu/drm/radeon/radeon_device.c | 2 - drivers/gpu/drm/radeon/radeon_fence.c | 2 +- drivers/gpu/drm/radeon/radeon_semaphore.c | 137 +++++------------------------ drivers/gpu/drm/radeon/radeon_test.c | 4 +- drivers/gpu/drm/radeon/rv770.c | 1 - drivers/gpu/drm/radeon/si.c | 1 - 10 files changed, 30 insertions(+), 149 deletions(-)

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c index 0e860c6..ec61194 100644 --- a/drivers/gpu/drm/radeon/evergreen.c +++ b/drivers/gpu/drm/radeon/evergreen.c @@ -3422,7 +3422,6 @@ void evergreen_fini(struct radeon_device *rdev) evergreen_pcie_gart_fini(rdev); r600_vram_scratch_fini(rdev); radeon_gem_fini(rdev); - radeon_semaphore_driver_fini(rdev); radeon_fence_driver_fini(rdev); radeon_agp_fini(rdev); radeon_bo_fini(rdev); diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c index 9cd2657..107b217 100644 --- a/drivers/gpu/drm/radeon/ni.c +++ b/drivers/gpu/drm/radeon/ni.c @@ -1744,7 +1744,6 @@ void cayman_fini(struct radeon_device *rdev) cayman_pcie_gart_fini(rdev); r600_vram_scratch_fini(rdev); radeon_gem_fini(rdev); - radeon_semaphore_driver_fini(rdev); radeon_fence_driver_fini(rdev); radeon_bo_fini(rdev); radeon_atombios_fini(rdev); diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index 1cadf97..2bce657 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -2658,7 +2658,6 @@ void r600_fini(struct radeon_device *rdev) r600_vram_scratch_fini(rdev); radeon_agp_fini(rdev); radeon_gem_fini(rdev); - radeon_semaphore_driver_fini(rdev); radeon_fence_driver_fini(rdev); radeon_bo_fini(rdev); radeon_atombios_fini(rdev); diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 1c3eb06..937db02 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -434,34 +434,13 @@ int radeon_mode_dumb_destroy(struct drm_file *file_priv, /* * Semaphores. */ -struct radeon_ring; - -#define RADEON_SEMAPHORE_BO_SIZE 256 - -struct radeon_semaphore_driver { - rwlock_t lock; - struct list_head bo; -}; - -struct radeon_semaphore_bo; - /* everything here is constant */ struct radeon_semaphore { - struct list_head list; + struct radeon_sa_bo *sa_bo; + signed waiters; uint64_t gpu_addr; - uint32_t *cpu_ptr; - struct radeon_semaphore_bo *bo; };

-struct radeon_semaphore_bo { - struct list_head list; - struct radeon_ib *ib; - struct list_head free; - struct radeon_semaphore semaphores[RADEON_SEMAPHORE_BO_SIZE/8]; - unsigned nused; -}; - -void radeon_semaphore_driver_fini(struct radeon_device *rdev); int radeon_semaphore_create(struct radeon_device *rdev, struct radeon_semaphore **semaphore); void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring, @@ -473,7 +452,8 @@ int radeon_semaphore_sync_rings(struct radeon_device *rdev, bool sync_to[RADEON_NUM_RINGS], int dst_ring); void radeon_semaphore_free(struct radeon_device *rdev, - struct radeon_semaphore *semaphore); + struct radeon_semaphore *semaphore, + struct radeon_fence *fence);

/* * GART structures, functions & helpers @@ -1522,7 +1502,6 @@ struct radeon_device { struct radeon_mman mman; struct radeon_fence_driver fence_drv[RADEON_NUM_RINGS]; wait_queue_head_t fence_queue; - struct radeon_semaphore_driver semaphore_drv; struct mutex ring_lock; struct radeon_ring ring[RADEON_NUM_RINGS]; struct radeon_ib_pool ib_pool; diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index cb4f9c2..9e28060 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -732,11 +732,9 @@ int radeon_device_init(struct radeon_device *rdev, mutex_init(&rdev->gem.mutex); mutex_init(&rdev->pm.mutex); mutex_init(&rdev->vram_mutex); - rwlock_init(&rdev->semaphore_drv.lock); INIT_LIST_HEAD(&rdev->gem.objects); init_waitqueue_head(&rdev->irq.vblank_queue); init_waitqueue_head(&rdev->irq.idle_queue); - INIT_LIST_HEAD(&rdev->semaphore_drv.bo); /* initialize vm here */ rdev->vm_manager.use_bitmap = 1; rdev->vm_manager.max_pfn = 1 << 20; diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c index 9c2c1b3..8b4778f 100644 --- a/drivers/gpu/drm/radeon/radeon_fence.c +++ b/drivers/gpu/drm/radeon/radeon_fence.c @@ -138,7 +138,7 @@ static void radeon_fence_destroy(struct kref *kref) fence = container_of(kref, struct radeon_fence, kref); fence->seq = RADEON_FENCE_NOTEMITED_SEQ; if (fence->semaphore) - radeon_semaphore_free(fence->rdev, fence->semaphore); + radeon_semaphore_free(fence->rdev, fence->semaphore, NULL); kfree(fence); }

diff --git a/drivers/gpu/drm/radeon/radeon_semaphore.c b/drivers/gpu/drm/radeon/radeon_semaphore.c index dbde874..1bc5513 100644 --- a/drivers/gpu/drm/radeon/radeon_semaphore.c +++ b/drivers/gpu/drm/radeon/radeon_semaphore.c @@ -31,118 +31,40 @@ #include "drm.h" #include "radeon.h"

-static int radeon_semaphore_add_bo(struct radeon_device *rdev) -{ - struct radeon_semaphore_bo *bo; - unsigned long irq_flags; - uint64_t gpu_addr; - uint32_t *cpu_ptr; - int r, i; - - bo = kmalloc(sizeof(struct radeon_semaphore_bo), GFP_KERNEL); - if (bo == NULL) { - return -ENOMEM; - } - INIT_LIST_HEAD(&bo->free); - INIT_LIST_HEAD(&bo->list); - bo->nused = 0; - - r = radeon_ib_get(rdev, 0, &bo->ib, RADEON_SEMAPHORE_BO_SIZE); - if (r) { - dev_err(rdev->dev, "failed to get a bo after 5 retry\n"); - kfree(bo); - return r; - } - gpu_addr = radeon_sa_bo_gpu_addr(bo->ib->sa_bo); - cpu_ptr = radeon_sa_bo_cpu_addr(bo->ib->sa_bo); - for (i = 0; i < (RADEON_SEMAPHORE_BO_SIZE/8); i++) { - bo->semaphores[i].gpu_addr = gpu_addr; - bo->semaphores[i].cpu_ptr = cpu_ptr; - bo->semaphores[i].bo = bo; - list_add_tail(&bo->semaphores[i].list, &bo->free); - gpu_addr += 8; - cpu_ptr += 2; - } - write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags); - list_add_tail(&bo->list, &rdev->semaphore_drv.bo); - write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags); - return 0; -} - -static void radeon_semaphore_del_bo_locked(struct radeon_device *rdev, - struct radeon_semaphore_bo *bo) -{ - radeon_sa_bo_free(rdev, &bo->ib->sa_bo, NULL); - radeon_fence_unref(&bo->ib->fence); - list_del(&bo->list); - kfree(bo); -} - -void radeon_semaphore_shrink_locked(struct radeon_device *rdev) -{ - struct radeon_semaphore_bo *bo, *n; - - if (list_empty(&rdev->semaphore_drv.bo)) { - return; - } - /* only shrink if first bo has free semaphore */ - bo = list_first_entry(&rdev->semaphore_drv.bo, struct radeon_semaphore_bo, list); - if (list_empty(&bo->free)) { - return; - } - list_for_each_entry_safe_continue(bo, n, &rdev->semaphore_drv.bo, list) { - if (bo->nused) - continue; - radeon_semaphore_del_bo_locked(rdev, bo); - } -}

int radeon_semaphore_create(struct radeon_device *rdev, struct radeon_semaphore **semaphore) { - struct radeon_semaphore_bo *bo; - unsigned long irq_flags; - bool do_retry = true; int r;

-retry: - *semaphore = NULL; - write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags); - list_for_each_entry(bo, &rdev->semaphore_drv.bo, list) { - if (list_empty(&bo->free)) - continue; - *semaphore = list_first_entry(&bo->free, struct radeon_semaphore, list); - (*semaphore)->cpu_ptr[0] = 0; - (*semaphore)->cpu_ptr[1] = 0; - list_del(&(*semaphore)->list); - bo->nused++; - break; - } - write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags); - + *semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL); if (*semaphore == NULL) { - if (do_retry) { - do_retry = false; - r = radeon_semaphore_add_bo(rdev); - if (r) - return r; - goto retry; - } return -ENOMEM; } - + r = radeon_sa_bo_new(rdev, &rdev->ib_pool.sa_manager, + &(*semaphore)->sa_bo, 8, 8, true); + if (r) { + kfree(*semaphore); + *semaphore = NULL; + return r; + } + (*semaphore)->waiters = 0; + (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo); + *((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0; return 0; }

void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring, struct radeon_semaphore *semaphore) { + --semaphore->waiters; radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false); }

void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring, struct radeon_semaphore *semaphore) { + ++semaphore->waiters; radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true); }

@@ -200,29 +122,16 @@ error: }

void radeon_semaphore_free(struct radeon_device *rdev, - struct radeon_semaphore *semaphore) + struct radeon_semaphore *semaphore, + struct radeon_fence *fence) { - unsigned long irq_flags; - - write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags); - semaphore->bo->nused--; - list_add_tail(&semaphore->list, &semaphore->bo->free); - radeon_semaphore_shrink_locked(rdev); - write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags); -} - -void radeon_semaphore_driver_fini(struct radeon_device *rdev) -{ - struct radeon_semaphore_bo *bo, *n; - unsigned long irq_flags; - - write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags); - /* we force to free everything */ - list_for_each_entry_safe(bo, n, &rdev->semaphore_drv.bo, list) { - if (!list_empty(&bo->free)) { - dev_err(rdev->dev, "still in use semaphore\n"); - } - radeon_semaphore_del_bo_locked(rdev, bo); + if (semaphore == NULL) { + return; + } + if (semaphore->waiters > 0) { + dev_err(rdev->dev, "semaphore %p has more waiters than signalers," + " hardware lockup imminent!\n", semaphore); } - write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags); + radeon_sa_bo_free(rdev, &semaphore->sa_bo, fence); + kfree(semaphore); } diff --git a/drivers/gpu/drm/radeon/radeon_test.c b/drivers/gpu/drm/radeon/radeon_test.c index dc5dcf4..b057387 100644 --- a/drivers/gpu/drm/radeon/radeon_test.c +++ b/drivers/gpu/drm/radeon/radeon_test.c @@ -317,7 +317,7 @@ void radeon_test_ring_sync(struct radeon_device *rdev,

out_cleanup: if (semaphore) - radeon_semaphore_free(rdev, semaphore); + radeon_semaphore_free(rdev, semaphore, NULL);

if (fence1) radeon_fence_unref(&fence1); @@ -437,7 +437,7 @@ void radeon_test_ring_sync2(struct radeon_device *rdev,

out_cleanup: if (semaphore) - radeon_semaphore_free(rdev, semaphore); + radeon_semaphore_free(rdev, semaphore, NULL);

if (fenceA) radeon_fence_unref(&fenceA); diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c index a8b0016..40f82e2 100644 --- a/drivers/gpu/drm/radeon/rv770.c +++ b/drivers/gpu/drm/radeon/rv770.c @@ -1278,7 +1278,6 @@ void rv770_fini(struct radeon_device *rdev) rv770_pcie_gart_fini(rdev); r600_vram_scratch_fini(rdev); radeon_gem_fini(rdev); - radeon_semaphore_driver_fini(rdev); radeon_fence_driver_fini(rdev); radeon_agp_fini(rdev); radeon_bo_fini(rdev); diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c index f8ee066..b25a8ff 100644 --- a/drivers/gpu/drm/radeon/si.c +++ b/drivers/gpu/drm/radeon/si.c @@ -4107,7 +4107,6 @@ void si_fini(struct radeon_device *rdev) si_pcie_gart_fini(rdev); r600_vram_scratch_fini(rdev); radeon_gem_fini(rdev); - radeon_semaphore_driver_fini(rdev); radeon_fence_driver_fini(rdev); radeon_bo_fini(rdev); radeon_atombios_fini(rdev);