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Date: Thu, 1 Sep 2022 11:27:44 +0530
From: "Kumar, M Chetan" <m.chetan.kumar@...ux.intel.com>
To: Sergey Ryazanov <ryazanov.s.a@...il.com>
Cc: netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
David Miller <davem@...emloft.net>,
Johannes Berg <johannes@...solutions.net>,
Loic Poulain <loic.poulain@...aro.org>,
"Sudi, Krishna C" <krishna.c.sudi@...el.com>,
Intel Corporation <linuxwwan@...el.com>,
Haijun Liu <haijun.liu@...iatek.com>,
Madhusmita Sahu <madhusmita.sahu@...el.com>,
Moises Veleta <moises.veleta@...ux.intel.com>,
Devegowda Chandrashekar <chandrashekar.devegowda@...el.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH net-next 1/5] net: wwan: t7xx: Add AP CLDMA
On 8/31/2022 7:34 PM, Sergey Ryazanov wrote:
> On Wed, Aug 31, 2022 at 3:46 PM Kumar, M Chetan
> <m.chetan.kumar@...ux.intel.com> wrote:
>> On 8/30/2022 7:23 AM, Sergey Ryazanov wrote:
>>> On Tue, Aug 16, 2022 at 7:11 AM <m.chetan.kumar@...el.com> wrote:
>>>> From: Haijun Liu <haijun.liu@...iatek.com>
>>>>
>>>> The t7xx device contains two Cross Layer DMA (CLDMA) interfaces to
>>>> communicate with AP and Modem processors respectively. So far only
>>>> MD-CLDMA was being used, this patch enables AP-CLDMA.
>>>>
>>>> Rename small Application Processor (sAP) to AP.
>>>>
>>>> Signed-off-by: Haijun Liu <haijun.liu@...iatek.com>
>>>> Co-developed-by: Madhusmita Sahu <madhusmita.sahu@...el.com>
>>>> Signed-off-by: Madhusmita Sahu <madhusmita.sahu@...el.com>
>>>> Signed-off-by: Moises Veleta <moises.veleta@...ux.intel.com>
>>>> Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@...el.com>
>>>> Signed-off-by: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
>>>> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
>>>
>>> Reviewed-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
>>>
>>> And just one nitpick/question below.
>>>
>>>> diff --git a/drivers/net/wwan/t7xx/t7xx_modem_ops.c b/drivers/net/wwan/t7xx/t7xx_modem_ops.c
>>>> index 3458af31e864..c5a3c95004bd 100644
>>>> --- a/drivers/net/wwan/t7xx/t7xx_modem_ops.c
>>>> +++ b/drivers/net/wwan/t7xx/t7xx_modem_ops.c
>>>> @@ -44,6 +44,7 @@
>>>> #include "t7xx_state_monitor.h"
>>>>
>>>> #define RT_ID_MD_PORT_ENUM 0
>>>> +#define RT_ID_AP_PORT_ENUM 1
>>>> /* Modem feature query identification code - "ICCC" */
>>>> #define MD_FEATURE_QUERY_ID 0x49434343
>>>>
>>>> @@ -296,6 +297,7 @@ static void t7xx_md_exception(struct t7xx_modem *md, enum hif_ex_stage stage)
>>>> }
>>>>
>>>> t7xx_cldma_exception(md->md_ctrl[CLDMA_ID_MD], stage);
>>>> + t7xx_cldma_exception(md->md_ctrl[CLDMA_ID_AP], stage);
>>>>
>>>> if (stage == HIF_EX_INIT)
>>>> t7xx_mhccif_h2d_swint_trigger(t7xx_dev, H2D_CH_EXCEPTION_ACK);
>>>> @@ -424,7 +426,7 @@ static int t7xx_parse_host_rt_data(struct t7xx_fsm_ctl *ctl, struct t7xx_sys_inf
>>>> if (ft_spt_st != MTK_FEATURE_MUST_BE_SUPPORTED)
>>>> return -EINVAL;
>>>>
>>>> - if (i == RT_ID_MD_PORT_ENUM)
>>>> + if (i == RT_ID_MD_PORT_ENUM || i == RT_ID_AP_PORT_ENUM)
>>>> t7xx_port_enum_msg_handler(ctl->md, rt_feature->data);
>>>> }
>>>>
>>>> @@ -454,12 +456,12 @@ static int t7xx_core_reset(struct t7xx_modem *md)
>>>> return 0;
>>>> }
>>>>
>>>> -static void t7xx_core_hk_handler(struct t7xx_modem *md, struct t7xx_fsm_ctl *ctl,
>>>> +static void t7xx_core_hk_handler(struct t7xx_modem *md, struct t7xx_sys_info *core_info,
>>>> + struct t7xx_fsm_ctl *ctl,
>>>> enum t7xx_fsm_event_state event_id,
>>>> enum t7xx_fsm_event_state err_detect)
>>>> {
>>>> struct t7xx_fsm_event *event = NULL, *event_next;
>>>> - struct t7xx_sys_info *core_info = &md->core_md;
>>>> struct device *dev = &md->t7xx_dev->pdev->dev;
>>>> unsigned long flags;
>>>> int ret;
>>>> @@ -529,19 +531,33 @@ static void t7xx_md_hk_wq(struct work_struct *work)
>>>> t7xx_cldma_start(md->md_ctrl[CLDMA_ID_MD]);
>>>> t7xx_fsm_broadcast_state(ctl, MD_STATE_WAITING_FOR_HS2);
>>>> md->core_md.handshake_ongoing = true;
>>>> - t7xx_core_hk_handler(md, ctl, FSM_EVENT_MD_HS2, FSM_EVENT_MD_HS2_EXIT);
>>>> + t7xx_core_hk_handler(md, &md->core_md, ctl, FSM_EVENT_MD_HS2, FSM_EVENT_MD_HS2_EXIT);
>>>> +}
>>>> +
>>>> +static void t7xx_ap_hk_wq(struct work_struct *work)
>>>> +{
>>>> + struct t7xx_modem *md = container_of(work, struct t7xx_modem, ap_handshake_work);
>>>> + struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
>>>> +
>>>> + /* Clear the HS2 EXIT event appended in t7xx_core_reset(). */
>>>> + t7xx_fsm_clr_event(ctl, FSM_EVENT_AP_HS2_EXIT);
>>>> + t7xx_cldma_stop(md->md_ctrl[CLDMA_ID_AP]);
>>>> + t7xx_cldma_switch_cfg(md->md_ctrl[CLDMA_ID_AP]);
>>>> + t7xx_cldma_start(md->md_ctrl[CLDMA_ID_AP]);
>>>> + md->core_ap.handshake_ongoing = true;
>>>> + t7xx_core_hk_handler(md, &md->core_ap, ctl, FSM_EVENT_AP_HS2, FSM_EVENT_AP_HS2_EXIT);
>>>> }
>>>>
>>>> void t7xx_md_event_notify(struct t7xx_modem *md, enum md_event_id evt_id)
>>>> {
>>>> struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
>>>> - void __iomem *mhccif_base;
>>>> unsigned int int_sta;
>>>> unsigned long flags;
>>>>
>>>> switch (evt_id) {
>>>> case FSM_PRE_START:
>>>> - t7xx_mhccif_mask_clr(md->t7xx_dev, D2H_INT_PORT_ENUM);
>>>> + t7xx_mhccif_mask_clr(md->t7xx_dev, D2H_INT_PORT_ENUM | D2H_INT_ASYNC_MD_HK |
>>>> + D2H_INT_ASYNC_AP_HK);
>>>> break;
>>>>
>>>> case FSM_START:
>>>> @@ -554,16 +570,26 @@ void t7xx_md_event_notify(struct t7xx_modem *md, enum md_event_id evt_id)
>>>> ctl->exp_flg = true;
>>>> md->exp_id &= ~D2H_INT_EXCEPTION_INIT;
>>>> md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
>>>> + md->exp_id &= ~D2H_INT_ASYNC_AP_HK;
>>>> } else if (ctl->exp_flg) {
>>>> md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
>>>> - } else if (md->exp_id & D2H_INT_ASYNC_MD_HK) {
>>>> - queue_work(md->handshake_wq, &md->handshake_work);
>>>> - md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
>>>> - mhccif_base = md->t7xx_dev->base_addr.mhccif_rc_base;
>>>> - iowrite32(D2H_INT_ASYNC_MD_HK, mhccif_base + REG_EP2RC_SW_INT_ACK);
>>>> - t7xx_mhccif_mask_set(md->t7xx_dev, D2H_INT_ASYNC_MD_HK);
>>>> + md->exp_id &= ~D2H_INT_ASYNC_AP_HK;
>>>> } else {
>>>> - t7xx_mhccif_mask_clr(md->t7xx_dev, D2H_INT_ASYNC_MD_HK);
>>>> + void __iomem *mhccif_base = md->t7xx_dev->base_addr.mhccif_rc_base;
>>>> +
>>>> + if (md->exp_id & D2H_INT_ASYNC_MD_HK) {
>>>> + queue_work(md->handshake_wq, &md->handshake_work);
>>>> + md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
>>>> + iowrite32(D2H_INT_ASYNC_MD_HK, mhccif_base + REG_EP2RC_SW_INT_ACK);
>>>> + t7xx_mhccif_mask_set(md->t7xx_dev, D2H_INT_ASYNC_MD_HK);
>>>> + }
>>>> +
>>>> + if (md->exp_id & D2H_INT_ASYNC_AP_HK) {
>>>> + queue_work(md->ap_handshake_wq, &md->ap_handshake_work);
>>>> + md->exp_id &= ~D2H_INT_ASYNC_AP_HK;
>>>> + iowrite32(D2H_INT_ASYNC_AP_HK, mhccif_base + REG_EP2RC_SW_INT_ACK);
>>>> + t7xx_mhccif_mask_set(md->t7xx_dev, D2H_INT_ASYNC_AP_HK);
>>>> + }
>>>> }
>>>> spin_unlock_irqrestore(&md->exp_lock, flags);
>>>>
>>>> @@ -576,6 +602,7 @@ void t7xx_md_event_notify(struct t7xx_modem *md, enum md_event_id evt_id)
>>>>
>>>> case FSM_READY:
>>>> t7xx_mhccif_mask_set(md->t7xx_dev, D2H_INT_ASYNC_MD_HK);
>>>> + t7xx_mhccif_mask_set(md->t7xx_dev, D2H_INT_ASYNC_AP_HK);
>>>> break;
>>>>
>>>> default:
>>>> @@ -627,6 +654,19 @@ static struct t7xx_modem *t7xx_md_alloc(struct t7xx_pci_dev *t7xx_dev)
>>>> md->core_md.feature_set[RT_ID_MD_PORT_ENUM] &= ~FEATURE_MSK;
>>>> md->core_md.feature_set[RT_ID_MD_PORT_ENUM] |=
>>>> FIELD_PREP(FEATURE_MSK, MTK_FEATURE_MUST_BE_SUPPORTED);
>>>> +
>>>> + md->ap_handshake_wq = alloc_workqueue("%s", WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI,
>>>> + 0, "ap_hk_wq");
>>>> + if (!md->ap_handshake_wq) {
>>>> + destroy_workqueue(md->handshake_wq);
>>>> + return NULL;
>>>> + }
>>>> +
>>>> + INIT_WORK(&md->ap_handshake_work, t7xx_ap_hk_wq);
>>>> + md->core_ap.feature_set[RT_ID_AP_PORT_ENUM] &= ~FEATURE_MSK;
>>>> + md->core_ap.feature_set[RT_ID_AP_PORT_ENUM] |=
>>>> + FIELD_PREP(FEATURE_MSK, MTK_FEATURE_MUST_BE_SUPPORTED);
>>>> +
>>>> return md;
>>>> }
>>>>
>>>> @@ -638,6 +678,7 @@ int t7xx_md_reset(struct t7xx_pci_dev *t7xx_dev)
>>>> md->exp_id = 0;
>>>> t7xx_fsm_reset(md);
>>>> t7xx_cldma_reset(md->md_ctrl[CLDMA_ID_MD]);
>>>> + t7xx_cldma_reset(md->md_ctrl[CLDMA_ID_AP]);
>>>> t7xx_port_proxy_reset(md->port_prox);
>>>> md->md_init_finish = true;
>>>> return t7xx_core_reset(md);
>>>> @@ -667,6 +708,10 @@ int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
>>>> if (ret)
>>>> goto err_destroy_hswq;
>>>>
>>>> + ret = t7xx_cldma_alloc(CLDMA_ID_AP, t7xx_dev);
>>>> + if (ret)
>>>> + goto err_destroy_hswq;
>>>> +
>>>> ret = t7xx_fsm_init(md);
>>>> if (ret)
>>>> goto err_destroy_hswq;
>>>> @@ -679,12 +724,16 @@ int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
>>>> if (ret)
>>>> goto err_uninit_ccmni;
>>>>
>>>> - ret = t7xx_port_proxy_init(md);
>>>> + ret = t7xx_cldma_init(md->md_ctrl[CLDMA_ID_AP]);
>>>> if (ret)
>>>> goto err_uninit_md_cldma;
>>>>
>>>> + ret = t7xx_port_proxy_init(md);
>>>> + if (ret)
>>>> + goto err_uninit_ap_cldma;
>>>> +
>>>> ret = t7xx_fsm_append_cmd(md->fsm_ctl, FSM_CMD_START, 0);
>>>> - if (ret) /* fsm_uninit flushes cmd queue */
>>>> + if (ret) /* t7xx_fsm_uninit() flushes cmd queue */
>>>> goto err_uninit_proxy;
>>>>
>>>> t7xx_md_sys_sw_init(t7xx_dev);
>>>> @@ -694,6 +743,9 @@ int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
>>>> err_uninit_proxy:
>>>> t7xx_port_proxy_uninit(md->port_prox);
>>>>
>>>> +err_uninit_ap_cldma:
>>>> + t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_AP]);
>>>> +
>>>> err_uninit_md_cldma:
>>>> t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_MD]);
>>>>
>>>> @@ -705,6 +757,7 @@ int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
>>>>
>>>> err_destroy_hswq:
>>>> destroy_workqueue(md->handshake_wq);
>>>> + destroy_workqueue(md->ap_handshake_wq);
>>>> dev_err(&t7xx_dev->pdev->dev, "Modem init failed\n");
>>>> return ret;
>>>> }
>>>> @@ -720,8 +773,10 @@ void t7xx_md_exit(struct t7xx_pci_dev *t7xx_dev)
>>>>
>>>> t7xx_fsm_append_cmd(md->fsm_ctl, FSM_CMD_PRE_STOP, FSM_CMD_FLAG_WAIT_FOR_COMPLETION);
>>>> t7xx_port_proxy_uninit(md->port_prox);
>>>> + t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_AP]);
>>>> t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_MD]);
>>>> t7xx_ccmni_exit(t7xx_dev);
>>>> t7xx_fsm_uninit(md);
>>>> destroy_workqueue(md->handshake_wq);
>>>> + destroy_workqueue(md->ap_handshake_wq);
>>>> }
>>>> diff --git a/drivers/net/wwan/t7xx/t7xx_modem_ops.h b/drivers/net/wwan/t7xx/t7xx_modem_ops.h
>>>> index 7469ed636ae8..c93e870ce696 100644
>>>> --- a/drivers/net/wwan/t7xx/t7xx_modem_ops.h
>>>> +++ b/drivers/net/wwan/t7xx/t7xx_modem_ops.h
>>>> @@ -66,10 +66,13 @@ struct t7xx_modem {
>>>> struct cldma_ctrl *md_ctrl[CLDMA_NUM];
>>>> struct t7xx_pci_dev *t7xx_dev;
>>>> struct t7xx_sys_info core_md;
>>>> + struct t7xx_sys_info core_ap;
>>>> bool md_init_finish;
>>>> bool rgu_irq_asserted;
>>>> struct workqueue_struct *handshake_wq;
>>>> struct work_struct handshake_work;
>>>> + struct workqueue_struct *ap_handshake_wq;
>>>
>>> Does the driver really need this dedicated workqueue for the AP
>>> handshake? Or can the existing handshake workqueue be reused for the
>>> AP handshake work scheduling too?
>>
>> It should be possible to reuse the existing handshake workqueue.
>> modified workqueue might look as below [1]. We could reuse the
>> md->exp_id inside the workqueue to decide MD or AP handshake flow.
>>
>> [1]
>> static void t7xx_hk_wq(struct work_struct *work)
>> {`
>> struct t7xx_modem *md = container_of(work, struct t7xx_modem,
>> handshake_work);
>> struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
>>
>> if (md->exp_id & D2H_INT_ASYNC_MD_HK) {
>> //modem handshake
>> ..
>> md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
>> }
>>
>> if (md->exp_id & D2H_INT_ASYNC_AP_HK) {
>> //AP handshake
>> ..
>> md->exp_id &= ~D2H_INT_ASYNC_AP_HK;
>> }
>> }
>
> I did not mean reuse the _work_, I meant reuse the _workqueue_. Just replace
>
> queue_work(md->ap_handshake_wq, &md->ap_handshake_work);
>
> by
>
> queue_work(md->handshake_wq, &md->ap_handshake_work);
>
> to avoid creating ap_handshake_wq and simplify the driver
> initialization. Does it make sense?
Sorry i misinterpreted it and thanks for correcting.
I will do the necessary changes.
--
Chetan
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