From 04e4e2e9558326316cf3e32d46cca83cc3861ef0 Mon Sep 17 00:00:00 2001 From: Yintian Tao Date: Thu, 23 Apr 2020 12:05:54 +0800 Subject: drm/amdgpu: protect ring overrun MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Wait for the oldest sequence on the ring to be signaled in order to make sure there will be no command overrun. v2: fix coding stype and remove abs operation v3: remove the initialization of variable r Signed-off-by: Yintian Tao Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c index a721b0e0ff69..0103acc57474 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c @@ -675,13 +675,15 @@ uint32_t amdgpu_kiq_rreg(struct amdgpu_device *adev, uint32_t reg) spin_lock_irqsave(&kiq->ring_lock, flags); if (amdgpu_device_wb_get(adev, ®_val_offs)) { - spin_unlock_irqrestore(&kiq->ring_lock, flags); pr_err("critical bug! too many kiq readers\n"); - goto failed_kiq_read; + goto failed_unlock; } amdgpu_ring_alloc(ring, 32); amdgpu_ring_emit_rreg(ring, reg, reg_val_offs); - amdgpu_fence_emit_polling(ring, &seq); + r = amdgpu_fence_emit_polling(ring, &seq, MAX_KIQ_REG_WAIT); + if (r) + goto failed_undo; + amdgpu_ring_commit(ring); spin_unlock_irqrestore(&kiq->ring_lock, flags); @@ -712,7 +714,13 @@ uint32_t amdgpu_kiq_rreg(struct amdgpu_device *adev, uint32_t reg) amdgpu_device_wb_free(adev, reg_val_offs); return value; +failed_undo: + amdgpu_ring_undo(ring); +failed_unlock: + spin_unlock_irqrestore(&kiq->ring_lock, flags); failed_kiq_read: + if (reg_val_offs) + amdgpu_device_wb_free(adev, reg_val_offs); pr_err("failed to read reg:%x\n", reg); return ~0; } @@ -730,7 +738,10 @@ void amdgpu_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v) spin_lock_irqsave(&kiq->ring_lock, flags); amdgpu_ring_alloc(ring, 32); amdgpu_ring_emit_wreg(ring, reg, v); - amdgpu_fence_emit_polling(ring, &seq); + r = amdgpu_fence_emit_polling(ring, &seq, MAX_KIQ_REG_WAIT); + if (r) + goto failed_undo; + amdgpu_ring_commit(ring); spin_unlock_irqrestore(&kiq->ring_lock, flags); @@ -759,6 +770,9 @@ void amdgpu_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v) return; +failed_undo: + amdgpu_ring_undo(ring); + spin_unlock_irqrestore(&kiq->ring_lock, flags); failed_kiq_write: pr_err("failed to write reg:%x\n", reg); } -- cgit v1.2.3