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Date: Tue, 25 Apr 2023 00:03:01 +0200
From: Marijn Suijten <marijn.suijten@...ainline.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
~postmarketos/upstreaming@...ts.sr.ht,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...ainline.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Martin Botka <martin.botka@...ainline.org>,
Jami Kettunen <jami.kettunen@...ainline.org>,
Jordan Crouse <jordan@...micpenguin.net>,
linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] drm/msm/dpu: Pass catalog pointers directly from
RM instead of IDs
On 2023-04-21 16:25:15, Abhinav Kumar wrote:
>
>
> On 4/21/2023 1:53 PM, Marijn Suijten wrote:
> > The Resource Manager already iterates over all available blocks from the
> > catalog, only to pass their ID to a dpu_hw_xxx_init() function which
> > uses an _xxx_offset() helper to search for and find the exact same
> > catalog pointer again to initialize the block with, fallible error
> > handling and all.
> >
> > Instead, pass const pointers to the catalog entries directly to these
> > _init functions and drop the for loops entirely, saving on both
> > readability complexity and unnecessary cycles at boot.
> >
> > Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>
> Overall, a nice cleanup!
>
> One comment below.
>
> > ---
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 37 +++++----------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h | 14 ++++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c | 32 +++---------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h | 11 +++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dspp.c | 38 ++++-----------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dspp.h | 12 +++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h | 2 +-
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 40 ++++++-----------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h | 12 +++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c | 38 ++++-----------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.h | 10 +++---
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_merge3d.c | 33 +++----------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_merge3d.h | 14 ++++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c | 33 +++----------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h | 14 ++++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.c | 39 ++++------------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.h | 12 +++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_vbif.c | 33 +++----------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_vbif.h | 11 +++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c | 33 ++++---------------
> > drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.h | 11 +++----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 17 +++++-----
> > drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 18 +++++-----
> > 23 files changed, 139 insertions(+), 375 deletions(-)
> >
>
> <snipped>
>
> > -struct dpu_hw_intf *dpu_hw_intf_init(enum dpu_intf idx,
> > - void __iomem *addr,
> > - const struct dpu_mdss_cfg *m)
> > +struct dpu_hw_intf *dpu_hw_intf_init(const struct dpu_intf_cfg *cfg,
> > + void __iomem *addr)
> > {
> > struct dpu_hw_intf *c;
> > - const struct dpu_intf_cfg *cfg;
> > +
> > + if (cfg->type == INTF_NONE) {
> > + pr_err("Cannot create interface hw object for INTF_NONE type\n");
> > + return ERR_PTR(-EINVAL);
> > + }
>
> The caller of dpu_hw_intf_init which is the RM already has protection
> for INTF_NONE, see below
>
> for (i = 0; i < cat->intf_count; i++) {
> struct dpu_hw_intf *hw;
> const struct dpu_intf_cfg *intf = &cat->intf[i];
>
> if (intf->type == INTF_NONE) {
> DPU_DEBUG("skip intf %d with type none\n", i);
> continue;
> }
> if (intf->id < INTF_0 || intf->id >= INTF_MAX) {
> DPU_ERROR("skip intf %d with invalid id\n",
> intf->id);
> continue;
> }
> hw = dpu_hw_intf_init(intf->id, mmio, cat);
>
> So this part can be dropped.
I mainly intended to keep original validation where _intf_offset would
skip INTF_NONE, and error out. RM init is hence expected to filter out
INTF_NONE instead of running into that `-EINVAL`, which I maintained
here.
If you think there won't be another caller of dpu_hw_intf_init, and that
such validation is hence excessive, I can remove it in a followup v3.
- Marijn
> > c = kzalloc(sizeof(*c), GFP_KERNEL);
> > if (!c)
> > return ERR_PTR(-ENOMEM);
> >
> > - cfg = _intf_offset(idx, m, addr, &c->hw);
> > - if (IS_ERR_OR_NULL(cfg)) {
> > - kfree(c);
> > - pr_err("failed to create dpu_hw_intf %d\n", idx);
> > - return ERR_PTR(-EINVAL);
> > - }
> > + c->hw.blk_addr = addr + cfg->base;
> > + c->hw.log_mask = DPU_DBG_MASK_INTF;
> >
>
> <snipped>
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