Re: [PATCH v2 2/3] drm/amdkfd: abstract the iommu device checking with ignore_crat

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I'd recommend making this the first change in the series. Make
'drm/amdkfd: force raven as "dgpu" path' the second patch. That way it
only needs to change one place.

A few more comments inline.


Am 2020-08-18 um 9:09 a.m. schrieb Huang Rui:
> It's better to use inline function to wrap the iommu checking.
>
> Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_chardev.c               |  2 +-
>  drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c                |  4 ++--
>  .../gpu/drm/amd/amdkfd/kfd_device_queue_manager_v9.c   |  2 +-
>  drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c           |  4 ++--
>  drivers/gpu/drm/amd/amdkfd/kfd_iommu.c                 | 10 +++++-----
>  drivers/gpu/drm/amd/amdkfd/kfd_priv.h                  |  8 ++++++++
>  drivers/gpu/drm/amd/amdkfd/kfd_topology.c              |  6 +++---
>  7 files changed, 22 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index 20ef754dc62e..0598a1682854 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1258,7 +1258,7 @@ bool kfd_dev_is_large_bar(struct kfd_dev *dev)
>  		return true;
>  	}
>  
> -	if (dev->device_info->needs_iommu_device && !ignore_crat)
> +	if (kfd_go_iommu_v2(dev->device_info))
>  		return false;
>  
>  	amdgpu_amdkfd_get_local_mem_info(dev->kgd, &mem_info);
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c b/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
> index 0c4161ac4102..04103273f52b 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
> @@ -309,7 +309,7 @@ static int dbgdev_address_watch_nodiq(struct kfd_dbgdev *dbgdev,
>  	for (i = 0; i < adw_info->num_watch_points; i++) {
>  		dbgdev_address_watch_set_registers(adw_info, &addrHi, &addrLo,
>  				&cntl, i, pdd->qpd.vmid,
> -				dbgdev->dev->device_info->needs_iommu_device && !ignore_crat);
> +				kfd_go_iommu_v2(dbgdev->dev->device_info));
>  
>  		pr_debug("\t\t%30s\n", "* * * * * * * * * * * * * * * * * *");
>  		pr_debug("\t\t%20s %08x\n", "register index :", i);
> @@ -399,7 +399,7 @@ static int dbgdev_address_watch_diq(struct kfd_dbgdev *dbgdev,
>  	for (i = 0; i < adw_info->num_watch_points; i++) {
>  		dbgdev_address_watch_set_registers(adw_info, &addrHi, &addrLo,
>  				&cntl, i, vmid,
> -				dbgdev->dev->device_info->needs_iommu_device && !ignore_crat);
> +				kfd_go_iommu_v2(dbgdev->dev->device_info));
>  
>  		pr_debug("\t\t%30s\n", "* * * * * * * * * * * * * * * * * *");
>  		pr_debug("\t\t%20s %08x\n", "register index :", i);
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_v9.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_v9.c
> index 48b86bdbb680..70cede08e555 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_v9.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_v9.c
> @@ -62,7 +62,7 @@ static int update_qpd_v9(struct device_queue_manager *dqm,
>  				SH_MEM_ALIGNMENT_MODE_UNALIGNED <<
>  					SH_MEM_CONFIG__ALIGNMENT_MODE__SHIFT;
>  		if (amdgpu_noretry &&
> -		    !(dqm->dev->device_info->needs_iommu_device && !ignore_crat))
> +		    !(kfd_go_iommu_v2(dqm->dev->device_info)))
>  			qpd->sh_mem_config |=
>  				1 << SH_MEM_CONFIG__RETRY_DISABLE__SHIFT;
>  
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c b/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
> index 6044d36bceb6..fe7e31014289 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
> @@ -321,7 +321,7 @@ static void kfd_init_apertures_vi(struct kfd_process_device *pdd, uint8_t id)
>  	pdd->lds_base = MAKE_LDS_APP_BASE_VI();
>  	pdd->lds_limit = MAKE_LDS_APP_LIMIT(pdd->lds_base);
>  
> -	if (!(pdd->dev->device_info->needs_iommu_device && !ignore_crat)) {
> +	if (!kfd_go_iommu_v2(pdd->dev->device_info)) {
>  		/* dGPUs: SVM aperture starting at 0
>  		 * with small reserved space for kernel.
>  		 * Set them to CANONICAL addresses.
> @@ -423,7 +423,7 @@ int kfd_init_apertures(struct kfd_process *process)
>  				return -EINVAL;
>  			}
>  
> -			if (!(dev->device_info->needs_iommu_device && !ignore_crat)) {
> +			if (!kfd_go_iommu_v2(dev->device_info)) {
>  				/* dGPUs: the reserved space for kernel
>  				 * before SVM
>  				 */
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c
> index c767b524bea4..ea05446572e1 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c
> @@ -41,7 +41,7 @@ int kfd_iommu_check_device(struct kfd_dev *kfd)
>  	struct amd_iommu_device_info iommu_info;
>  	int err;
>  
> -	if (!(kfd->device_info->needs_iommu_device && !ignore_crat))
> +	if (!kfd_go_iommu_v2(kfd->device_info))
>  		return -ENODEV;
>  
>  	iommu_info.flags = 0;
> @@ -63,7 +63,7 @@ int kfd_iommu_device_init(struct kfd_dev *kfd)
>  	unsigned int pasid_limit;
>  	int err;
>  
> -	if (!(kfd->device_info->needs_iommu_device && !ignore_crat))
> +	if (!kfd_go_iommu_v2(kfd->device_info))
>  		return 0;
>  
>  	iommu_info.flags = 0;
> @@ -109,7 +109,7 @@ int kfd_iommu_bind_process_to_device(struct kfd_process_device *pdd)
>  	struct kfd_process *p = pdd->process;
>  	int err;
>  
> -	if (!(dev->device_info->needs_iommu_device && !ignore_crat) || pdd->bound == PDD_BOUND)
> +	if (!kfd_go_iommu_v2(dev->device_info) || pdd->bound == PDD_BOUND)
>  		return 0;
>  
>  	if (unlikely(pdd->bound == PDD_BOUND_SUSPENDED)) {
> @@ -284,7 +284,7 @@ static void kfd_unbind_processes_from_device(struct kfd_dev *kfd)
>   */
>  void kfd_iommu_suspend(struct kfd_dev *kfd)
>  {
> -	if (!(kfd->device_info->needs_iommu_device && !ignore_crat))
> +	if (!kfd_go_iommu_v2(kfd->device_info))
>  		return;
>  
>  	kfd_unbind_processes_from_device(kfd);
> @@ -304,7 +304,7 @@ int kfd_iommu_resume(struct kfd_dev *kfd)
>  	unsigned int pasid_limit;
>  	int err;
>  
> -	if (!(kfd->device_info->needs_iommu_device && !ignore_crat))
> +	if (!kfd_go_iommu_v2(kfd->device_info))
>  		return 0;
>  
>  	pasid_limit = kfd_get_pasid_limit();
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index 60243798cce2..5087b23ccdb2 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> @@ -1232,6 +1232,14 @@ static inline int kfd_devcgroup_check_permission(struct kfd_dev *kfd)
>  #endif
>  }
>  
> +static inline bool kfd_go_iommu_v2(const struct kfd_device_info *info)

I'd prefer a different function name: kfd_device_use_iommu_v2.

Then make the parameter const struct kfd_device *dev.

> +{
> +	if (!info)
> +		return false;
> +
> +	return info->needs_iommu_device && !ignore_crat;
> +}

If you need a NULL check, you could still write it in a more compact way
(I like inline functions to be one-liners):

    return !ignore_crat && dev && dev->device_info->needs_iommu_device;

If you make this the first patch in the series, remove the !ignore_crat
part. That would be added in the second change.

Regards,
  Felix


> +
>  /* Debugfs */
>  #if defined(CONFIG_DEBUG_FS)
>  
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> index ad8139594b6f..e6f03867e0ed 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> @@ -545,7 +545,7 @@ static ssize_t node_show(struct kobject *kobj, struct attribute *attr,
>  		 * If the ASIC is APU except Kaveri, set local memory size
>  		 * to 0 to disable local memory support
>  		 */
> -		if (!(dev->gpu->device_info->needs_iommu_device && !ignore_crat)
> +		if (!kfd_go_iommu_v2(dev->gpu->device_info)
>  			|| dev->gpu->device_info->asic_family == CHIP_KAVERI) {
>  			amdgpu_amdkfd_get_local_mem_info(dev->gpu->kgd,
>  				&local_mem_info);
> @@ -1198,7 +1198,7 @@ static struct kfd_topology_device *kfd_assign_gpu(struct kfd_dev *gpu)
>  		/* Discrete GPUs need their own topology device list
>  		 * entries. Don't assign them to CPU/APU nodes.
>  		 */
> -		if (!(gpu->device_info->needs_iommu_device && !ignore_crat) &&
> +		if (!kfd_go_iommu_v2(gpu->device_info) &&
>  		    dev->node_props.cpu_cores_count)
>  			continue;
>  
> @@ -1453,7 +1453,7 @@ int kfd_topology_add_device(struct kfd_dev *gpu)
>  	* Overwrite ATS capability according to needs_iommu_device to fix
>  	* potential missing corresponding bit in CRAT of BIOS.
>  	*/
> -	if (dev->gpu->device_info->needs_iommu_device && !ignore_crat)
> +	if (kfd_go_iommu_v2(dev->gpu->device_info))
>  		dev->node_props.capability |= HSA_CAP_ATS_PRESENT;
>  	else
>  		dev->node_props.capability &= ~HSA_CAP_ATS_PRESENT;
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