Module: Mesa Branch: main Commit: c2601f06908434aaddd6b1db5e995bbda22d2a72 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c2601f06908434aaddd6b1db5e995bbda22d2a72
Author: Iago Toral Quiroga <[email protected]> Date: Mon Feb 6 13:16:12 2023 +0100 v3dv: ensure at least V3D_CL_MAX_INSTR_SIZE bytes in last CL instruction The CLE parser in the sim will read this many bytes for each instruction in a CL, so we should ensure we have at least that many bytes available in the BO when reading the last instruction, otherwise we can trigger a GMP violation. It is not clear whether this behavior applies to real hardware too. cc: mesa-stable Reviewed-by: Alejandro Piñeiro <[email protected]> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21162> --- src/broadcom/common/v3d_limits.h | 2 ++ src/broadcom/vulkan/v3dv_cl.c | 18 +++++++++++------- 2 files changed, 13 insertions(+), 7 deletions(-) diff --git a/src/broadcom/common/v3d_limits.h b/src/broadcom/common/v3d_limits.h index 755aedd787c..492740c44f9 100644 --- a/src/broadcom/common/v3d_limits.h +++ b/src/broadcom/common/v3d_limits.h @@ -24,6 +24,8 @@ #ifndef V3D_LIMITS_H #define V3D_LIMITS_H +#define V3D_CL_MAX_INSTR_SIZE 25 + /* Number of channels a QPU thread executes in parallel. Also known as * gl_SubGroupSizeARB. */ diff --git a/src/broadcom/vulkan/v3dv_cl.c b/src/broadcom/vulkan/v3dv_cl.c index fab9b05ec48..acdd013a996 100644 --- a/src/broadcom/vulkan/v3dv_cl.c +++ b/src/broadcom/vulkan/v3dv_cl.c @@ -122,14 +122,18 @@ v3dv_cl_ensure_space_with_branch(struct v3dv_cl *cl, uint32_t space) * end with a 'return from sub list' command. */ bool needs_return_from_sub_list = false; - if (cl->job->type == V3DV_JOB_TYPE_GPU_CL_SECONDARY) { - if (cl->size > 0) { + if (cl->job->type == V3DV_JOB_TYPE_GPU_CL_SECONDARY && cl->size > 0) needs_return_from_sub_list = true; - space += cl_packet_length(RETURN_FROM_SUB_LIST); - } - } else { - space += cl_packet_length(BRANCH); - } + + /* + * The CLE processor in the simulator tries to read V3D_CL_MAX_INSTR_SIZE + * bytes form the CL for each new instruction. If the last instruction in our + * CL is smaller than that, and there are not at least V3D_CL_MAX_INSTR_SIZE + * bytes until the end of the BO, it will read out of bounds and possibly + * cause a GMP violation interrupt to trigger. Ensure we always have at + * least that many bytes available to read with the last instruction. + */ + space += V3D_CL_MAX_INSTR_SIZE; if (v3dv_cl_offset(cl) + space <= cl->size) return;
