On Thu 17 Jun 09:09 CDT 2021, Dmitry Baryshkov wrote:
> The struct dpu_irq_callbacks looks internal to IRQ handling code. Hide
> it from the rest of the DPU driver.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h | 18 +++---
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 6 +-
> .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h | 2 +-
> .../drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c | 10 ++-
> .../drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 6 +-
> .../gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 62 ++++++++++++++-----
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 12 ----
> drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h | 8 +--
> 8 files changed, 69 insertions(+), 55 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h
> index 90ae6c9ccc95..44ab97fb2964 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h
> @@ -46,10 +46,8 @@ u32 dpu_core_irq_read(
> * interrupt
> * @dpu_kms: DPU handle
> * @irq_idx: irq index
> - * @irq_cb: IRQ callback structure, containing callback function
> - * and argument. Passing NULL for irq_cb will unregister
> - * the callback for the given irq_idx
> - * This must exist until un-registration.
> + * @irq_cb: IRQ callback funcion.
> + * @irq_arg: IRQ callback argument.
> * @return: 0 for success registering callback, otherwise failure
> *
> * This function supports registration of multiple callbacks for each interrupt.
> @@ -57,17 +55,16 @@ u32 dpu_core_irq_read(
> int dpu_core_irq_register_callback(
> struct dpu_kms *dpu_kms,
> int irq_idx,
> - struct dpu_irq_callback *irq_cb);
> + void (*irq_cb)(void *arg, int irq_idx),
> + void *irq_arg);
>
> /**
> * dpu_core_irq_unregister_callback - For unregistering callback function on IRQ
> * interrupt
> * @dpu_kms: DPU handle
> * @irq_idx: irq index
> - * @irq_cb: IRQ callback structure, containing callback function
> - * and argument. Passing NULL for irq_cb will unregister
> - * the callback for the given irq_idx
> - * This must match with registration.
> + * @irq_cb: IRQ callback funcion.
> + * @irq_arg: IRQ callback argument.
> * @return: 0 for success registering callback, otherwise failure
> *
> * This function supports registration of multiple callbacks for each interrupt.
> @@ -75,7 +72,8 @@ int dpu_core_irq_register_callback(
> int dpu_core_irq_unregister_callback(
> struct dpu_kms *dpu_kms,
> int irq_idx,
> - struct dpu_irq_callback *irq_cb);
> + void (*irq_cb)(void *arg, int irq_idx),
> + void *irq_arg);
>
> /**
> * dpu_debugfs_core_irq_init - register core irq debugfs
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 7f06238a7c64..186b2f87d193 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -310,7 +310,7 @@ int dpu_encoder_helper_wait_for_irq(struct dpu_encoder_phys *phys_enc,
> phys_enc->hw_pp->idx - PINGPONG_0,
> atomic_read(wait_info->atomic_cnt));
> local_irq_save(flags);
> - irq->cb.func(phys_enc, irq->irq_idx);
> + irq->func(phys_enc, irq->irq_idx);
> local_irq_restore(flags);
> ret = 0;
> } else {
> @@ -352,7 +352,7 @@ int dpu_encoder_helper_register_irq(struct dpu_encoder_phys *phys_enc,
> }
>
> ret = dpu_core_irq_register_callback(phys_enc->dpu_kms, irq->irq_idx,
> - &irq->cb);
> + irq->func, phys_enc);
> if (ret) {
> DPU_ERROR_PHYS(phys_enc,
> "failed to register IRQ callback for %s\n",
> @@ -384,7 +384,7 @@ int dpu_encoder_helper_unregister_irq(struct dpu_encoder_phys *phys_enc,
> }
>
> ret = dpu_core_irq_unregister_callback(phys_enc->dpu_kms, irq->irq_idx,
> - &irq->cb);
> + irq->func, phys_enc);
> if (ret) {
> DRM_ERROR("unreg cb fail id=%u, intr=%d, irq=%d ret=%d",
> DRMID(phys_enc->parent), intr_idx,
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> index e7270eb6b84b..80d87871fd94 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> @@ -174,7 +174,7 @@ struct dpu_encoder_irq {
> const char *name;
> enum dpu_intr_idx intr_idx;
> int irq_idx;
> - struct dpu_irq_callback cb;
> + void (*func)(void *arg, int irq_idx);
> };
>
> /**
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> index dba1219c6f1b..dbc8f0811dd1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> @@ -786,30 +786,28 @@ struct dpu_encoder_phys *dpu_encoder_phys_cmd_init(
> phys_enc->enable_state = DPU_ENC_DISABLED;
> for (i = 0; i < INTR_IDX_MAX; i++) {
> irq = &phys_enc->irq[i];
> - INIT_LIST_HEAD(&irq->cb.list);
> irq->irq_idx = -EINVAL;
> - irq->cb.arg = phys_enc;
> }
>
> irq = &phys_enc->irq[INTR_IDX_CTL_START];
> irq->name = "ctl_start";
> irq->intr_idx = INTR_IDX_CTL_START;
> - irq->cb.func = dpu_encoder_phys_cmd_ctl_start_irq;
> + irq->func = dpu_encoder_phys_cmd_ctl_start_irq;
>
> irq = &phys_enc->irq[INTR_IDX_PINGPONG];
> irq->name = "pp_done";
> irq->intr_idx = INTR_IDX_PINGPONG;
> - irq->cb.func = dpu_encoder_phys_cmd_pp_tx_done_irq;
> + irq->func = dpu_encoder_phys_cmd_pp_tx_done_irq;
>
> irq = &phys_enc->irq[INTR_IDX_RDPTR];
> irq->name = "pp_rd_ptr";
> irq->intr_idx = INTR_IDX_RDPTR;
> - irq->cb.func = dpu_encoder_phys_cmd_pp_rd_ptr_irq;
> + irq->func = dpu_encoder_phys_cmd_pp_rd_ptr_irq;
>
> irq = &phys_enc->irq[INTR_IDX_UNDERRUN];
> irq->name = "underrun";
> irq->intr_idx = INTR_IDX_UNDERRUN;
> - irq->cb.func = dpu_encoder_phys_cmd_underrun_irq;
> + irq->func = dpu_encoder_phys_cmd_underrun_irq;
>
> atomic_set(&phys_enc->vblank_refcount, 0);
> atomic_set(&phys_enc->pending_kickoff_cnt, 0);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> index 391b13b99c01..21722cdfaaf7 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> @@ -728,20 +728,18 @@ struct dpu_encoder_phys *dpu_encoder_phys_vid_init(
> phys_enc->enc_spinlock = p->enc_spinlock;
> for (i = 0; i < INTR_IDX_MAX; i++) {
> irq = &phys_enc->irq[i];
> - INIT_LIST_HEAD(&irq->cb.list);
> irq->irq_idx = -EINVAL;
> - irq->cb.arg = phys_enc;
> }
>
> irq = &phys_enc->irq[INTR_IDX_VSYNC];
> irq->name = "vsync_irq";
> irq->intr_idx = INTR_IDX_VSYNC;
> - irq->cb.func = dpu_encoder_phys_vid_vblank_irq;
> + irq->func = dpu_encoder_phys_vid_vblank_irq;
>
> irq = &phys_enc->irq[INTR_IDX_UNDERRUN];
> irq->name = "underrun";
> irq->intr_idx = INTR_IDX_UNDERRUN;
> - irq->cb.func = dpu_encoder_phys_vid_underrun_irq;
> + irq->func = dpu_encoder_phys_vid_underrun_irq;
>
> atomic_set(&phys_enc->vblank_refcount, 0);
> atomic_set(&phys_enc->pending_kickoff_cnt, 0);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> index e5dce884e7c0..73a20fc5c766 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> @@ -32,6 +32,18 @@
> #define MDP_INTF_1_OFF_REV_7xxx 0x35000
> #define MDP_INTF_5_OFF_REV_7xxx 0x39000
>
> +/*
> + * struct dpu_irq_callback - IRQ callback handlers
> + * @list: list to callback
> + * @func: intr handler
> + * @arg: argument for the handler
> + */
> +struct dpu_irq_callback {
> + struct list_head list;
> + void (*func)(void *arg, int irq_idx);
> + void *arg;
> +};
> +
> /**
> * struct dpu_intr_reg - array of DPU register sets
> * @clr_off: offset to CLEAR reg
> @@ -428,20 +440,19 @@ void dpu_hw_intr_destroy(struct dpu_hw_intr *intr)
> }
>
> int dpu_core_irq_register_callback(struct dpu_kms *dpu_kms, int irq_idx,
> - struct dpu_irq_callback *register_irq_cb)
> + void (*irq_cb)(void *arg, int irq_idx),
> + void *irq_arg)
> {
> unsigned long irq_flags;
> + struct dpu_irq_callback *register_irq_cb;
>
> if (!dpu_kms->hw_intr->irq_cb_tbl) {
> DPU_ERROR("invalid params\n");
> return -EINVAL;
> }
>
> - if (!register_irq_cb || !register_irq_cb->func) {
> - DPU_ERROR("invalid irq_cb:%d func:%d\n",
> - register_irq_cb != NULL,
> - register_irq_cb ?
> - register_irq_cb->func != NULL : -1);
> + if (!irq_cb) {
> + DPU_ERROR("invalid ird_idx:%d irq_cb:%ps\n", irq_idx, irq_cb);
> return -EINVAL;
> }
>
> @@ -452,9 +463,16 @@ int dpu_core_irq_register_callback(struct dpu_kms *dpu_kms, int irq_idx,
At least the callbacks related to the interfaces are registered and
unregistered for every frame, so I would prefer that we don't
kzalloc()/kfree() in this code path.
I've unfortunately not been able to backtrack this fully, but I was
expecting something like that register the callbacks once and then
mask/unmask the interrupts as needed - in which case this patch looks
good.
Regards,
Bjorn
