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Message-ID: <7ya6xrvbhdqddkglzzj6mtdxn735j56quguhohd5oid7vqut2w@wygb7ryzkj4r>
Date: Thu, 5 Sep 2024 16:30:57 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, quic_abhinavk@...cinc.com,
Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>, quic_ebharadw@...cinc.com, linux-arm-msm@...r.kernel.org,
dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH 11/21] drm/msm/dpu: Add RM support for allocating CWB
On Tue, Sep 03, 2024 at 06:04:13PM GMT, Jessica Zhang wrote:
>
>
> On 8/30/2024 3:16 PM, Dmitry Baryshkov wrote:
> > On Fri, 30 Aug 2024 at 22:28, Jessica Zhang <quic_jesszhan@...cinc.com> wrote:
> > >
> > >
> > >
> > > On 8/30/2024 10:18 AM, Dmitry Baryshkov wrote:
> > > > On Thu, Aug 29, 2024 at 01:48:32PM GMT, Jessica Zhang wrote:
> > > > > Add support for allocating the concurrent writeback mux as part of the
> > > > > WB allocation
> > > > >
> > > > > Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> > > > > ---
> > > > > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h | 5 ++++-
> > > > > drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 30 +++++++++++++++++++++++++++--
> > > > > 2 files changed, 32 insertions(+), 3 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> > > > > index c17d2d356f7a..c43cb55fe1d2 100644
> > > > > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> > > > > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> > > > > @@ -1,5 +1,7 @@
> > > > > /* SPDX-License-Identifier: GPL-2.0-only */
> > > > > -/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
> > > > > +/*
> > > > > + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> > > > > + * Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
> > > > > */
> > > > >
> > > > > #ifndef _DPU_HW_MDSS_H
> > > > > @@ -352,6 +354,7 @@ struct dpu_mdss_color {
> > > > > #define DPU_DBG_MASK_DSPP (1 << 10)
> > > > > #define DPU_DBG_MASK_DSC (1 << 11)
> > > > > #define DPU_DBG_MASK_CDM (1 << 12)
> > > > > +#define DPU_DBG_MASK_CWB (1 << 13)
> > > > >
> > > > > /**
> > > > > * struct dpu_hw_tear_check - Struct contains parameters to configure
> > > > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > > > > index bc99b04eae3a..738e9a081b10 100644
> > > > > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > > > > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > > > > @@ -1,9 +1,10 @@
> > > > > // SPDX-License-Identifier: GPL-2.0-only
> > > > > /*
> > > > > * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
> > > > > - * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
> > > > > + * Copyright (c) 2023-2024 Qualcomm Innovation Center, Inc. All rights reserved.
> > > > > */
> > > > >
> > > > > +#include <drm/drm_managed.h>
> > > > > #include "msm_drv.h"
> > > > > #define pr_fmt(fmt) "[drm:%s] " fmt, __func__
> > > > > #include "dpu_kms.h"
> > > > > @@ -34,6 +35,7 @@ int dpu_rm_init(struct drm_device *dev,
> > > > > void __iomem *mmio)
> > > > > {
> > > > > int rc, i;
> > > > > + struct dpu_hw_blk_reg_map *cwb_reg_map;
> > > > >
> > > > > if (!rm || !cat || !mmio) {
> > > > > DPU_ERROR("invalid kms\n");
> > > > > @@ -100,11 +102,35 @@ int dpu_rm_init(struct drm_device *dev,
> > > > > rm->hw_intf[intf->id - INTF_0] = hw;
> > > > > }
> > > > >
> > > > > + if (cat->cwb_count > 0) {
> > > > > + cwb_reg_map = drmm_kzalloc(dev,
> > > > > + sizeof(*cwb_reg_map) * cat->cwb_count,
> > > > > + GFP_KERNEL);
> > > >
> > > > Please move CWB block pointers to dpu_rm. There is no need to allocate a
> > > > separate array.
> > >
> > > Hi Dmitry,
> > >
> > > Sorry, I'm not sure what you mean here. Can you clarify your comment?
> > >
> > > This is just allocating an array of the CWB register addresses so that
> > > the hw_wb block can use it to configure the CWB mux registers.
> >
> > Excuse me. I asked to make the cwb_reg_map array a part of the
> > existing dpu_rm structure. This way other subblocks can access it
> > through dpu_rm API.
>
> Got it, thanks for the clarification. Just wondering, is the intent here to
> add CWB to rm's get_assigned_resourced?
>
> The CWB registers will be handled by hw_wb and isn't referenced anywhere
> outside of hw_wb (aside from when it's being allocated and passed into
> hw_wb_init) so I'm not sure what's the benefit of adding it to the dpu_rm
> struct.
To have a single point where all the blocks are handled, pretty much
like we have a single catalog where all blocks are allocated. Note how
e.g. how MERGE_3D is handled. Or how we return harware instances for
INTF or WB.
>
> >
> > >
> > > Thanks,
> > >
> > > Jessica Zhang
> > >
> > > >
> > > > > +
> > > > > + if (!cwb_reg_map) {
> > > > > + DPU_ERROR("failed cwb object creation\n");
> > > > > + return -ENOMEM;
> > > > > + }
> > > > > + }
> > > > > +
> > > > > +
> > > > > + for (i = 0; i < cat->cwb_count; i++) {
> > > > > + struct dpu_hw_blk_reg_map *cwb = &cwb_reg_map[i];
> > > > > +
> > > > > + cwb->blk_addr = mmio + cat->cwb[i].base;
> > > > > + cwb->log_mask = DPU_DBG_MASK_CWB;
> > > > > + }
> > > > > +
> > > > > for (i = 0; i < cat->wb_count; i++) {
> > > > > struct dpu_hw_wb *hw;
> > > > > const struct dpu_wb_cfg *wb = &cat->wb[i];
> > > > >
> > > > > - hw = dpu_hw_wb_init(dev, wb, mmio, cat->mdss_ver);
> > > > > + if (cat->cwb)
> > > > > + hw = dpu_hw_wb_init_with_cwb(dev, wb, mmio,
> > > > > + cat->mdss_ver, cwb_reg_map);
> > > > > + else
> > > > > + hw = dpu_hw_wb_init(dev, wb, mmio, cat->mdss_ver);
> > > > > +
> > > > > if (IS_ERR(hw)) {
> > > > > rc = PTR_ERR(hw);
> > > > > DPU_ERROR("failed wb object creation: err %d\n", rc);
> > > > >
> > > > > --
> > > > > 2.34.1
> > > > >
> > > >
> > > > --
> > > > With best wishes
> > > > Dmitry
> >
> >
> >
> > --
> > With best wishes
> > Dmitry
--
With best wishes
Dmitry
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