From: George Zhang <[email protected]> If a plane reaches calculate_mcache_setting with a zero-area viewport, calculate_mcache_setting exits early with num_mcaches == 0 and mvmpg_width/height == 0. This will cause a divide-by-zero panic and can also cause an underflow on num_mcaches.
Fix this by changing calculate_mcache_setting to bool and adding guards after each calculate_mcache_row_bytes call. If num_mcaches or mvmpg_width/height is zero, return a false. Callers will propagate the failure as a rejected mode, which prevents the panic. Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/5302 Reviewed-by: Sun peng (Leo) Li <[email protected]> Reviewed-by: Dillon Varone <[email protected]> Signed-off-by: George Zhang <[email protected]> Signed-off-by: Fangzhi Zuo <[email protected]> Tested-by: Dan Wheeler <[email protected]> --- .../src/dml2_core/dml2_core_dcn4_calcs.c | 31 +++++++++++++++---- 1 file changed, 25 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c index fa78016b32fc..110ab26a6a39 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c +++ b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c @@ -2453,7 +2453,7 @@ static void calculate_mcache_row_bytes( DML_ASSERT(*p->num_mcaches > 0); } -static void calculate_mcache_setting( +static bool calculate_mcache_setting( struct dml2_core_internal_scratch *scratch, struct dml2_core_calcs_calculate_mcache_setting_params *p) { @@ -2479,7 +2479,7 @@ static void calculate_mcache_setting( *p->lc_comb_mcache = 0; if (!p->dcc_enable) - return; + return true; l->is_dual_plane = dml_is_420(p->source_format) || p->source_format == dml2_rgbe_alpha; @@ -2516,7 +2516,14 @@ static void calculate_mcache_setting( l->l_p.mvmpg_per_mcache_lb = &l->mvmpg_per_mcache_lb_l; calculate_mcache_row_bytes(scratch, &l->l_p); - DML_ASSERT(*p->num_mcaches_l > 0); + if (*p->num_mcaches_l == 0 || + (p->surf_vert ? l->mvmpg_height_l : l->mvmpg_width_l) == 0) { + DML_LOG_VERBOSE("DML::%s: degenerate luma viewport (num_mcaches_l=%u mvmpg_%s_l=%u) — mode not supported\n", + __func__, *p->num_mcaches_l, + p->surf_vert ? "height" : "width", + p->surf_vert ? l->mvmpg_height_l : l->mvmpg_width_l); + return false; + } if (l->is_dual_plane) { l->c_p.num_chans = p->num_chans; @@ -2552,7 +2559,14 @@ static void calculate_mcache_setting( l->c_p.mvmpg_per_mcache_lb = &l->mvmpg_per_mcache_lb_c; calculate_mcache_row_bytes(scratch, &l->c_p); - DML_ASSERT(*p->num_mcaches_c > 0); + if (*p->num_mcaches_c == 0 || + (p->surf_vert ? l->mvmpg_height_c : l->mvmpg_width_c) == 0) { + DML_LOG_VERBOSE("DML::%s: degenerate chroma viewport (num_mcaches_c=%u mvmpg_%s_c=%u) — mode not supported\n", + __func__, *p->num_mcaches_c, + p->surf_vert ? "height" : "width", + p->surf_vert ? l->mvmpg_height_c : l->mvmpg_width_c); + return false; + } } // Sharing for iMALL access @@ -2662,6 +2676,7 @@ static void calculate_mcache_setting( *p->mcache_shift_granularity_l = l->mvmpg_access_width_l; *p->mcache_shift_granularity_c = l->mvmpg_access_width_c; + return true; } static void calculate_mall_bw_overhead_factor( @@ -9490,7 +9505,10 @@ static bool dml_core_mode_support(struct dml2_core_calcs_mode_support_ex *in_out calculate_mcache_setting_params->mall_comb_mcache_c = &mode_lib->ms.mall_comb_mcache_c[k]; calculate_mcache_setting_params->lc_comb_mcache = &mode_lib->ms.lc_comb_mcache[k]; - calculate_mcache_setting(&mode_lib->scratch, calculate_mcache_setting_params); + if (!calculate_mcache_setting(&mode_lib->scratch, calculate_mcache_setting_params)) { + mode_lib->ms.support.ModeSupport = false; + return false; + } } calculate_mall_bw_overhead_factor( @@ -10969,7 +10987,8 @@ static bool dml_core_mode_programming(struct dml2_core_calcs_mode_programming_ex calculate_mcache_setting_params->mall_comb_mcache_l = &mode_lib->mp.mall_comb_mcache_l[k]; calculate_mcache_setting_params->mall_comb_mcache_c = &mode_lib->mp.mall_comb_mcache_c[k]; calculate_mcache_setting_params->lc_comb_mcache = &mode_lib->mp.lc_comb_mcache[k]; - calculate_mcache_setting(&mode_lib->scratch, calculate_mcache_setting_params); + if (!calculate_mcache_setting(&mode_lib->scratch, calculate_mcache_setting_params)) + return false; } calculate_mall_bw_overhead_factor( -- 2.53.0
