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From: "Tian, Kevin" <kevin.tian@intel.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	 Alex Williamson <alex.williamson@redhat.com>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Jean-Philippe Brucker <jean-philippe@linaro.com>
Cc: "Raj, Ashok" <ashok.raj@intel.com>, Jonathan Cameron <jic23@kernel.org>
Subject: RE: [PATCH 01/10] iommu/ioasid: Introduce system-wide capacity
Date: Fri, 27 Mar 2020 08:07:20 +0000
Message-ID: <AADFC41AFE54684AB9EE6CBC0274A5D19D7ED264@SHSMSX104.ccr.corp.intel.com> (raw)
In-Reply-To: <1585158931-1825-2-git-send-email-jacob.jun.pan@linux.intel.com>

> From: Jacob Pan <jacob.jun.pan@linux.intel.com>
> Sent: Thursday, March 26, 2020 1:55 AM
> 
> IOASID is a limited system-wide resource that can be allocated at
> runtime. This limitation can be enumerated during boot. For example, on
> x86 platforms, PCI Process Address Space ID (PASID) allocation uses
> IOASID service. The number of supported PASID bits are enumerated by
> extended capability register as defined in the VT-d spec.
> 
> This patch adds a helper to set the system capacity, it expected to be
> set during boot prior to any allocation request.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> ---
>  drivers/iommu/ioasid.c | 15 +++++++++++++++
>  include/linux/ioasid.h |  5 ++++-
>  2 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/ioasid.c b/drivers/iommu/ioasid.c
> index 0f8dd377aada..4026e52855b9 100644
> --- a/drivers/iommu/ioasid.c
> +++ b/drivers/iommu/ioasid.c
> @@ -17,6 +17,21 @@ struct ioasid_data {
>  	struct rcu_head rcu;
>  };
> 
> +static ioasid_t ioasid_capacity;
> +static ioasid_t ioasid_capacity_avail;
> +
> +/* System capacity can only be set once */
> +void ioasid_install_capacity(ioasid_t total)
> +{
> +	if (ioasid_capacity) {
> +		pr_warn("IOASID capacity already set at %d\n",
> ioasid_capacity);
> +		return;
> +	}
> +
> +	ioasid_capacity = ioasid_capacity_avail = total;
> +}
> +EXPORT_SYMBOL_GPL(ioasid_install_capacity);
> +

From all the texts in this patch, looks ioasid_set_capacity might be
a better name?

>  /*
>   * struct ioasid_allocator_data - Internal data structure to hold information
>   * about an allocator. There are two types of allocators:
> diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
> index 6f000d7a0ddc..9711fa0dc357 100644
> --- a/include/linux/ioasid.h
> +++ b/include/linux/ioasid.h
> @@ -40,7 +40,7 @@ void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
>  int ioasid_register_allocator(struct ioasid_allocator_ops *allocator);
>  void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator);
>  int ioasid_set_data(ioasid_t ioasid, void *data);
> -
> +void ioasid_install_capacity(ioasid_t total);
>  #else /* !CONFIG_IOASID */
>  static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
>  				    ioasid_t max, void *private)
> @@ -72,5 +72,8 @@ static inline int ioasid_set_data(ioasid_t ioasid, void
> *data)
>  	return -ENOTSUPP;
>  }
> 
> +static inline void ioasid_install_capacity(ioasid_t total)
> +{
> +}
>  #endif /* CONFIG_IOASID */
>  #endif /* __LINUX_IOASID_H */
> --
> 2.7.4

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  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-25 17:55 [PATCH 00/10] IOASID extensions for guest SVA Jacob Pan
2020-03-25 17:55 ` [PATCH 01/10] iommu/ioasid: Introduce system-wide capacity Jacob Pan
2020-03-27  8:07   ` Tian, Kevin [this message]
2020-03-27 16:08     ` Jacob Pan
2020-04-01 13:45   ` Jean-Philippe Brucker
2020-04-01 22:50     ` Jacob Pan
2020-03-25 17:55 ` [PATCH 02/10] iommu/vt-d: Set IOASID capacity when SVM is enabled Jacob Pan
2020-03-27  8:08   ` Tian, Kevin
2020-03-25 17:55 ` [PATCH 03/10] iommu/ioasid: Introduce per set allocation APIs Jacob Pan
2020-03-26  2:12   ` Lu Baolu
2020-03-26 21:30     ` Jacob Pan
2020-03-27  8:38   ` Tian, Kevin
2020-03-27 16:59     ` Jacob Pan
2020-03-28  6:32       ` Tian, Kevin
2020-04-01 13:47   ` Jean-Philippe Brucker
2020-04-06 20:02     ` Jacob Pan
2020-04-07 11:01       ` Jean-Philippe Brucker
2020-04-21 21:51         ` Jacob Pan
2020-03-25 17:55 ` [PATCH 04/10] iommu/ioasid: Rename ioasid_set_data to avoid confusion with ioasid_set Jacob Pan
2020-03-27  9:35   ` Tian, Kevin
2020-03-25 17:55 ` [PATCH 05/10] iommu/ioasid: Create an IOASID set for host SVA use Jacob Pan
2020-03-27  9:41   ` Tian, Kevin
2020-03-27 17:28     ` Jacob Pan
2020-03-28  6:33       ` Tian, Kevin
2020-04-01 13:53   ` Jean-Philippe Brucker
2020-04-06 15:33     ` Jacob Pan
2020-04-07 11:01       ` Jean-Philippe Brucker
2020-04-13 22:06         ` Jacob Pan
2020-04-15 15:10           ` Jean-Philippe Brucker
2020-03-25 17:55 ` [PATCH 06/10] iommu/ioasid: Convert to set aware allocations Jacob Pan
2020-03-27  9:54   ` Tian, Kevin
2020-03-27 17:41     ` Jacob Pan
2020-03-28  6:40       ` Tian, Kevin
2020-04-06 20:07         ` Jacob Pan
2020-04-01 13:55   ` Jean-Philippe Brucker
2020-04-01 22:45     ` Jacob Pan
2020-03-25 17:55 ` [PATCH 07/10] iommu/ioasid: Use mutex instead of spinlock Jacob Pan
2020-03-27  9:55   ` Tian, Kevin
2020-04-01 13:58   ` Jean-Philippe Brucker
2020-03-25 17:55 ` [PATCH 08/10] iommu/ioasid: Introduce notifier APIs Jacob Pan
2020-03-27 10:03   ` Tian, Kevin
2020-03-27 18:36     ` Jacob Pan
2020-03-28  6:43       ` Tian, Kevin
2020-03-31 15:13         ` Jacob Pan
2020-04-01 14:00   ` Jean-Philippe Brucker
2020-04-10 15:43     ` Jacob Pan
2020-03-25 17:55 ` [PATCH 09/10] iommu/ioasid: Support ioasid_set quota adjustment Jacob Pan
2020-03-27 10:09   ` Tian, Kevin
2020-03-27 23:30     ` Jacob Pan
2020-03-28  6:44       ` Tian, Kevin
2020-03-25 17:55 ` [PATCH 10/10] iommu/vt-d: Register PASID notifier for status change Jacob Pan
2020-03-27 10:22   ` Tian, Kevin
2020-03-27 23:47     ` Jacob Pan
2020-04-01 14:03 ` [PATCH 00/10] IOASID extensions for guest SVA Jean-Philippe Brucker
2020-04-01 23:38   ` Jacob Pan
2020-04-02 12:26     ` Jean-Philippe Brucker
2020-04-02 16:09       ` Jacob Pan

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