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Date: Tue, 5 Sep 2017 16:33:13 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Mikko Perttunen <mperttunen@...dia.com>, thierry.reding@...il.com,
jonathanh@...dia.com
Cc: dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/6] gpu: host1x: Enable Tegra186 syncpoint protection
On 05.09.2017 11:10, Mikko Perttunen wrote:
> Since Tegra186 the Host1x hardware allows syncpoints to be assigned to
> specific channels, preventing any other channels from incrementing
> them.
>
> Enable this feature where available and assign syncpoints to channels
> when submitting a job. Syncpoints are currently never unassigned from
> channels since that would require extra work and is unnecessary with
> the current channel allocation model.
>
> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> ---
>
> Notes:
> v2:
> - Changed from set_protection(bool) to enable_protection
> - Added some comments
> - Added missing check for hv_regs being NULL in
> enable_protection
>
> drivers/gpu/host1x/dev.h | 15 +++++++++++++
> drivers/gpu/host1x/hw/channel_hw.c | 3 +++
> drivers/gpu/host1x/hw/syncpt_hw.c | 46 ++++++++++++++++++++++++++++++++++++++
> drivers/gpu/host1x/syncpt.c | 8 +++++++
> 4 files changed, 72 insertions(+)
>
> diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
> index def802c0a6bf..7497cc5ead9e 100644
> --- a/drivers/gpu/host1x/dev.h
> +++ b/drivers/gpu/host1x/dev.h
> @@ -79,6 +79,9 @@ struct host1x_syncpt_ops {
> u32 (*load)(struct host1x_syncpt *syncpt);
> int (*cpu_incr)(struct host1x_syncpt *syncpt);
> int (*patch_wait)(struct host1x_syncpt *syncpt, void *patch_addr);
> + void (*assign_channel)(struct host1x_syncpt *syncpt,
> + struct host1x_channel *channel);
> + void (*enable_protection)(struct host1x *host);
> };
>
> struct host1x_intr_ops {
> @@ -186,6 +189,18 @@ static inline int host1x_hw_syncpt_patch_wait(struct host1x *host,
> return host->syncpt_op->patch_wait(sp, patch_addr);
> }
>
> +static inline void host1x_hw_syncpt_assign_channel(struct host1x *host,
> + struct host1x_syncpt *sp,
> + struct host1x_channel *ch)
> +{
> + return host->syncpt_op->assign_channel(sp, ch);
> +}
> +
> +static inline void host1x_hw_syncpt_enable_protection(struct host1x *host)
> +{
> + return host->syncpt_op->enable_protection(host);
> +}
> +
> static inline int host1x_hw_intr_init_host_sync(struct host1x *host, u32 cpm,
> void (*syncpt_thresh_work)(struct work_struct *))
> {
> diff --git a/drivers/gpu/host1x/hw/channel_hw.c b/drivers/gpu/host1x/hw/channel_hw.c
> index 8447a56c41ca..0161da331702 100644
> --- a/drivers/gpu/host1x/hw/channel_hw.c
> +++ b/drivers/gpu/host1x/hw/channel_hw.c
> @@ -147,6 +147,9 @@ static int channel_submit(struct host1x_job *job)
>
> syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
>
> + /* assign syncpoint to channel */
> + host1x_hw_syncpt_assign_channel(host, sp, ch);
This function could be renamed to host1x_hw_assign_syncpt_to_channel() and then
comment to it won't be needed.
It is not very nice that channel would be re-assigned on each submit. Maybe that
assignment should be done by host1x_syncpt_request() ?
> +
> job->syncpt_end = syncval;
>
> /* add a setclass for modules that require it */
> diff --git a/drivers/gpu/host1x/hw/syncpt_hw.c b/drivers/gpu/host1x/hw/syncpt_hw.c
> index 7b0270d60742..dc7a44614fef 100644
> --- a/drivers/gpu/host1x/hw/syncpt_hw.c
> +++ b/drivers/gpu/host1x/hw/syncpt_hw.c
> @@ -106,6 +106,50 @@ static int syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr)
> return 0;
> }
>
> +/**
> + * syncpt_assign_channel() - Assign syncpoint to channel
> + * @sp: syncpoint
> + * @ch: channel
> + *
> + * On chips with the syncpoint protection feature (Tegra186+), assign @sp to
> + * @ch, preventing other channels from incrementing the syncpoints. If @ch is
> + * NULL, unassigns the syncpoint.
> + *
> + * On older chips, do nothing.
> + */
> +static void syncpt_assign_channel(struct host1x_syncpt *sp,
> + struct host1x_channel *ch)
> +{
> +#if HOST1X_HW >= 6
> + struct host1x *host = sp->host;
> +
> + if (!host->hv_regs)
> + return;
> +
> + host1x_sync_writel(host,
> + HOST1X_SYNC_SYNCPT_CH_APP_CH(ch ? ch->id : 0xff),
> + HOST1X_SYNC_SYNCPT_CH_APP(sp->id));
> +#endif
> +}
> +
> +/**
> + * syncpt_enable_protection() - Enable syncpoint protection
> + * @host: host1x instance
> + *
> + * On chips with the syncpoint protection feature (Tegra186+), enable this
> + * feature. On older chips, do nothing.
> + */
> +static void syncpt_enable_protection(struct host1x *host)
> +{
> +#if HOST1X_HW >= 6
> + if (!host->hv_regs)
> + return;
> +
> + host1x_hypervisor_writel(host, HOST1X_HV_SYNCPT_PROT_EN_CH_EN,
> + HOST1X_HV_SYNCPT_PROT_EN);
> +#endif
> +}
> +
> static const struct host1x_syncpt_ops host1x_syncpt_ops = {
> .restore = syncpt_restore,
> .restore_wait_base = syncpt_restore_wait_base,
> @@ -113,4 +157,6 @@ static const struct host1x_syncpt_ops host1x_syncpt_ops = {
> .load = syncpt_load,
> .cpu_incr = syncpt_cpu_incr,
> .patch_wait = syncpt_patch_wait,
> + .assign_channel = syncpt_assign_channel,
> + .enable_protection = syncpt_enable_protection,
> };
> diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
> index 048ac9e344ce..4c7a4c8b2ad2 100644
> --- a/drivers/gpu/host1x/syncpt.c
> +++ b/drivers/gpu/host1x/syncpt.c
> @@ -398,6 +398,13 @@ int host1x_syncpt_init(struct host1x *host)
> for (i = 0; i < host->info->nb_pts; i++) {
> syncpt[i].id = i;
> syncpt[i].host = host;
> +
> + /*
> + * Unassign syncpt from channels for purposes of Tegra186
> + * syncpoint protection. This prevents any channel from
> + * accessing it until it is reassigned.
> + */
> + host1x_hw_syncpt_assign_channel(host, &syncpt[i], NULL);
> }
>
> for (i = 0; i < host->info->nb_bases; i++)
> @@ -408,6 +415,7 @@ int host1x_syncpt_init(struct host1x *host)
> host->bases = bases;
>
> host1x_syncpt_restore(host);
> + host1x_hw_syncpt_enable_protection(host);
>
> /* Allocate sync point to use for clearing waits for expired fences */
> host->nop_sp = host1x_syncpt_alloc(host, NULL, 0);
>
--
Dmitry
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