[PATCH] drm/amd/display: use pre-allocated temp structure for bounding box

[Alex Deucher]

On Wed, Jun 5, 2024 at 12:07 PM Harry Wentland <harry.wentland at amd.com> wrote:
>
>
>
> On 2024-06-04 11:50, Alex Deucher wrote:
> > This mirrors what the driver does for older DCN generations.
> >
> > Should fix:
> >
> > BUG: sleeping function called from invalid context at include/linux/sched/mm.h:306
> > in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 449, name: kworker/u64:8
> > preempt_count: 2, expected: 0
> > RCU nest depth: 0, expected: 0
> > Preemption disabled at:
> > ffffffffc0ce1580>] dc_fpu_begin+0x30/0xd0 [amdgpu]
> > CPU: 5 PID: 449 Comm: kworker/u64:8 Tainted: G        W          6.8.0+ #35
> > Hardware name: System manufacturer System Product Name/ROG STRIX X570-E GAMING WIFI II, BIOS 4204 02/24/2022
> > Workqueue: events_unbound async_run_entry_fn
> >
> > Fixes: 88c61827cedc ("drm/amd/display: dynamically allocate dml2_configuration_options structures")
> > Suggested-by: Hamza Mahfooz <hamza.mahfooz at amd.com>
> > Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> > Cc: George Zhang <george.zhang at amd.com>
> > Cc: Arnd Bergmann <arnd at arndb.de>
> > Cc: harry.wentland at amd.com
> > Cc: sunpeng.li at amd.com
> > Cc: Rodrigo.Siqueira at amd.com
>
> Reviewed-by: Harry Wentland <harry.wentland at amd.com>
>

Please review v2 of the patches.  There was an extra memcpy in the originals.

Alex

> Harry
>
> > ---
> >  drivers/gpu/drm/amd/display/dc/dc.h                       | 1 +
> >  .../drm/amd/display/dc/resource/dcn32/dcn32_resource.c    | 8 +++-----
> >  .../drm/amd/display/dc/resource/dcn321/dcn321_resource.c  | 8 +++-----
> >  3 files changed, 7 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
> > index d0ed01ac460d..d843933ad731 100644
> > --- a/drivers/gpu/drm/amd/display/dc/dc.h
> > +++ b/drivers/gpu/drm/amd/display/dc/dc.h
> > @@ -1444,6 +1444,7 @@ struct dc {
> >       } scratch;
> >
> >       struct dml2_configuration_options dml2_options;
> > +     struct dml2_configuration_options dml2_tmp;
> >       enum dc_acpi_cm_power_state power_state;
> >
> >  };
> > diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
> > index 0f11d7c8791c..7a8aa9396dea 100644
> > --- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
> > +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
> > @@ -2007,11 +2007,9 @@ void dcn32_calculate_wm_and_dlg(struct dc *dc, struct dc_state *context,
> >
> >  static void dcn32_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_params)
> >  {
> > -     struct dml2_configuration_options *dml2_opt;
> > +     struct dml2_configuration_options *dml2_opt = &dc->dml2_tmp;
> >
> > -     dml2_opt = kmemdup(&dc->dml2_options, sizeof(dc->dml2_options), GFP_KERNEL);
> > -     if (!dml2_opt)
> > -             return;
> > +     memcpy(dml2_opt, &dc->dml2_options, sizeof(dc->dml2_options));
> >
> >       DC_FP_START();
> >
> > @@ -2027,7 +2025,7 @@ static void dcn32_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw
> >
> >       DC_FP_END();
> >
> > -     kfree(dml2_opt);
> > +     memcpy(&dc->dml2_options, dml2_opt, sizeof(dc->dml2_options));
> >  }
> >
> >  static struct resource_funcs dcn32_res_pool_funcs = {
> > diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c
> > index 07ca6f58447d..ef30e8632607 100644
> > --- a/drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c
> > +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c
> > @@ -1581,11 +1581,9 @@ static struct dc_cap_funcs cap_funcs = {
> >
> >  static void dcn321_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_params)
> >  {
> > -     struct dml2_configuration_options *dml2_opt;
> > +     struct dml2_configuration_options *dml2_opt = &dc->dml2_tmp;
> >
> > -     dml2_opt = kmemdup(&dc->dml2_options, sizeof(dc->dml2_options), GFP_KERNEL);
> > -     if (!dml2_opt)
> > -             return;
> > +     memcpy(dml2_opt, &dc->dml2_options, sizeof(dc->dml2_options));
> >
> >       DC_FP_START();
> >
> > @@ -1601,7 +1599,7 @@ static void dcn321_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *b
> >
> >       DC_FP_END();
> >
> > -     kfree(dml2_opt);
> > +     memcpy(&dc->dml2_options, dml2_opt, sizeof(dc->dml2_options));
> >  }
> >
> >  static struct resource_funcs dcn321_res_pool_funcs = {
>