From a8985ca6d3bf1bcfc3e42923e616beeea1927a7b Mon Sep 17 00:00:00 2001 From: Rakesh Naidu Bhaviripudi Date: Mon, 10 Jun 2024 12:20:24 +0530 Subject: [PATCH] msm: kgsl: Fix error handling during drawctxt switch Currently, separate submissions are made for page table switch and context switch to the ring buffer. However, if the page table switch succeeds but the context switch fails, it can lead to use of wrong page table for drawctxt. To address this issue, rollback the pagetable to current pagetable. Also,correctly put the refcount of adreno context during error cleanup. Change-Id: I1bb4ee3ebb0ce6ea32f0b6799cfb7fa89c0d09c7 Signed-off-by: Rakesh Naidu Bhaviripudi --- drivers/gpu/msm/adreno_drawctxt.c | 12 +++++++++--- drivers/gpu/msm/adreno_iommu.c | 14 +++++++++++++- 2 files changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/msm/adreno_drawctxt.c b/drivers/gpu/msm/adreno_drawctxt.c index 6af6e23c797f..26ce5f24112c 100644 --- a/drivers/gpu/msm/adreno_drawctxt.c +++ b/drivers/gpu/msm/adreno_drawctxt.c @@ -1,4 +1,5 @@ /* Copyright (c) 2002,2007-2018,2020, The Linux Foundation. All rights reserved. + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -629,8 +630,6 @@ int adreno_drawctxt_switch(struct adreno_device *adreno_dev, if (drawctxt != NULL && kgsl_context_detached(&drawctxt->base)) return -ENOENT; - trace_adreno_drawctxt_switch(rb, drawctxt); - /* Get a refcount to the new instance */ if (drawctxt) { if (!_kgsl_context_get(&drawctxt->base)) @@ -643,7 +642,7 @@ int adreno_drawctxt_switch(struct adreno_device *adreno_dev, } ret = adreno_ringbuffer_set_pt_ctx(rb, new_pt, drawctxt, flags); if (ret) - return ret; + goto err; if (rb->drawctxt_active) { /* Wait for the timestamp to expire */ @@ -654,6 +653,13 @@ int adreno_drawctxt_switch(struct adreno_device *adreno_dev, } } + trace_adreno_drawctxt_switch(rb, drawctxt); + rb->drawctxt_active = drawctxt; + return 0; +err: + if (drawctxt) + kgsl_context_put(&drawctxt->base); + return ret; } diff --git a/drivers/gpu/msm/adreno_iommu.c b/drivers/gpu/msm/adreno_iommu.c index 032a19c1d37a..d5a37fcab45c 100644 --- a/drivers/gpu/msm/adreno_iommu.c +++ b/drivers/gpu/msm/adreno_iommu.c @@ -1,5 +1,5 @@ /* Copyright (c) 2002,2007-2017, The Linux Foundation. All rights reserved. - * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + * Copyright (c) 2022,2024 Qualcomm Innovation Center, Inc. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -964,5 +964,17 @@ int adreno_iommu_set_pt_ctx(struct adreno_ringbuffer *rb, else result = _set_ctxt_gpu(rb, drawctxt); + /* + * In case ctxt switch fails, revert the pagetable back to the + * original. Not reverting the pagetable will lead to incorrect + * hardware state in the ringbuffer. + */ + if (result && (new_pt != cur_pt)) { + if (cpu_path) + result = _set_pagetable_cpu(rb, cur_pt); + else + result = _set_pagetable_gpu(rb, cur_pt); + } + return result; }