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SubjectRe: [PATCH 1/4] gpu: host1x: Enable Tegra186 syncpoint protection
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On 08/19/2017 01:36 AM, Dmitry Osipenko wrote:
> On 18.08.2017 19:15, 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@nvidia.com>
>> ---
>> drivers/gpu/host1x/dev.h | 16 ++++++++++++++++
>> drivers/gpu/host1x/hw/channel_hw.c | 3 +++
>> drivers/gpu/host1x/hw/syncpt_hw.c | 26 ++++++++++++++++++++++++++
>> drivers/gpu/host1x/syncpt.c | 3 +++
>> 4 files changed, 48 insertions(+)
>>
>> diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
>> index def802c0a6bf..2432a30ff6e2 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 (*set_protection)(struct host1x *host, bool enabled);
>> };
>>
>> struct host1x_intr_ops {
>> @@ -186,6 +189,19 @@ 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_set_protection(struct host1x *host,
>> + bool enabled)
>> +{
>> + return host->syncpt_op->set_protection(host, enabled);
>> +}
>> +
>> 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);
>> +
>> 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..5d117ab1699e 100644
>> --- a/drivers/gpu/host1x/hw/syncpt_hw.c
>> +++ b/drivers/gpu/host1x/hw/syncpt_hw.c
>> @@ -106,6 +106,30 @@ static int syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr)
>> return 0;
>> }
>>
>> +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
>> +}
>> +
>> +static void syncpt_set_protection(struct host1x *host, bool enabled)
>> +{
>> +#if HOST1X_HW >= 6
>> + host1x_hypervisor_writel(host,
>> + enabled ? HOST1X_HV_SYNCPT_PROT_EN_CH_EN : 0,
>> + 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 +137,6 @@ 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,
>> + .set_protection = syncpt_set_protection,
>> };
>> diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
>> index 048ac9e344ce..fe4d963b3e2a 100644
>> --- a/drivers/gpu/host1x/syncpt.c
>> +++ b/drivers/gpu/host1x/syncpt.c
>> @@ -398,6 +398,8 @@ int host1x_syncpt_init(struct host1x *host)
>> for (i = 0; i < host->info->nb_pts; i++) {
>> syncpt[i].id = i;
>> syncpt[i].host = host;
>> +
>> + host1x_hw_syncpt_assign_channel(host, &syncpt[i], NULL);
>> }
>>
>> for (i = 0; i < host->info->nb_bases; i++)
>> @@ -408,6 +410,7 @@ int host1x_syncpt_init(struct host1x *host)
>> host->bases = bases;
>>
>> host1x_syncpt_restore(host);
>> + host1x_hw_syncpt_set_protection(host, true);
>
> Is it really okay to force the protection? Maybe protection should be enabled
> with a respect to CONFIG_TEGRA_HOST1X_FIREWALL? In that case we would have to
> avoid software jobs validation for Tegra124+.

I don't quite get your comment. The hardware syncpt protection layer
being enabled should never hurt - it doesn't mess with any valid jobs.
It's also only on Tegra186 so I'm not sure where the Tegra124 comes from.

Cheers,
Mikko

>
>>
>> /* Allocate sync point to use for clearing waits for expired fences */
>> host->nop_sp = host1x_syncpt_alloc(host, NULL, 0);
>>
>
>

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