From: Bjorn Helgaas <helgaas@kernel.org>
To: sathyanarayanan.kuppuswamy@linux.intel.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
ashok.raj@intel.com, keith.busch@intel.com
Subject: Re: [PATCH v5 3/7] PCI/ATS: Initialize PASID in pci_ats_init()
Date: Wed, 14 Aug 2019 23:56:59 -0500
Message-ID: <20190815045659.GF253360@google.com> (raw)
In-Reply-To: <5edb0209f7657e0706d4e5305ea0087873603daf.1564702313.git.sathyanarayanan.kuppuswamy@linux.intel.com>
On Thu, Aug 01, 2019 at 05:06:00PM -0700, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>
> Currently, PASID Capability checks are repeated across all PASID API's.
> Instead, cache the capability check result in pci_pasid_init() and use
> it in other PASID API's. Also, since PASID is a shared resource between
> PF/VF, initialize PASID features with default values in pci_pasid_init().
>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> + * TODO: Since PASID is a shared resource between PF/VF, don't update
> + * PASID features in the same API as a per device feature.
This comment is slightly misleading (at least, it misled *me* :))
because it hints that PASID might be specific to SR-IOV. But I don't
think that's true, so if you keep a comment like this, please reword
it along the lines of "for SR-IOV devices, the PF's PASID is shared
between the PF and all VFs" so it leaves open the possibility of
non-SR-IOV devices using PASID as well.
Bjorn
next prev parent reply index
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-02 0:05 [PATCH v5 0/7] Fix PF/VF dependency issue sathyanarayanan.kuppuswamy
2019-08-02 0:05 ` [PATCH v5 1/7] PCI/ATS: Fix pci_prg_resp_pasid_required() dependency issues sathyanarayanan.kuppuswamy
2019-08-12 20:04 ` Bjorn Helgaas
2019-08-12 20:20 ` sathyanarayanan kuppuswamy
2019-08-13 3:51 ` Bjorn Helgaas
2019-08-16 18:06 ` Kuppuswamy Sathyanarayanan
2019-08-02 0:05 ` [PATCH v5 2/7] PCI/ATS: Initialize PRI in pci_ats_init() sathyanarayanan.kuppuswamy
2019-08-12 20:04 ` Bjorn Helgaas
2019-08-12 21:35 ` sathyanarayanan kuppuswamy
2019-08-13 4:10 ` Bjorn Helgaas
2019-08-15 4:46 ` Bjorn Helgaas
2019-08-15 17:30 ` Kuppuswamy Sathyanarayanan
2019-08-16 17:31 ` Bjorn Helgaas
2019-08-02 0:06 ` [PATCH v5 3/7] PCI/ATS: Initialize PASID " sathyanarayanan.kuppuswamy
2019-08-12 20:04 ` Bjorn Helgaas
2019-08-15 4:48 ` Bjorn Helgaas
2019-08-15 4:56 ` Bjorn Helgaas [this message]
2019-08-15 17:31 ` Kuppuswamy Sathyanarayanan
2019-08-02 0:06 ` [PATCH v5 4/7] PCI/ATS: Add PRI support for PCIe VF devices sathyanarayanan.kuppuswamy
2019-08-12 20:04 ` Bjorn Helgaas
2019-08-12 21:40 ` sathyanarayanan kuppuswamy
2019-08-13 4:16 ` Bjorn Helgaas
2019-08-15 22:20 ` Bjorn Helgaas
2019-08-15 22:39 ` Kuppuswamy Sathyanarayanan
2019-08-19 14:15 ` Bjorn Helgaas
2019-08-19 22:53 ` Kuppuswamy Sathyanarayanan
2019-08-19 23:19 ` Bjorn Helgaas
2019-08-28 18:21 ` Kuppuswamy Sathyanarayanan
2019-08-28 18:57 ` Bjorn Helgaas
2019-08-02 0:06 ` [PATCH v5 5/7] PCI/ATS: Add PASID " sathyanarayanan.kuppuswamy
2019-08-12 20:05 ` Bjorn Helgaas
2019-08-13 22:19 ` Kuppuswamy Sathyanarayanan
2019-08-15 5:04 ` Bjorn Helgaas
2019-08-16 1:21 ` Kuppuswamy Sathyanarayanan
2019-08-02 0:06 ` [PATCH v5 6/7] PCI/ATS: Disable PF/VF ATS service independently sathyanarayanan.kuppuswamy
2019-08-02 0:06 ` [PATCH v5 7/7] PCI: Skip Enhanced Allocation (EA) initialization for VF device sathyanarayanan.kuppuswamy
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