From: Lu Baolu <baolu.lu@linux.intel.com>
To: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
"Mehta, Sohil" <sohil.mehta@intel.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"dwmw2@infradead.org" <dwmw2@infradead.org>
Cc: baolu.lu@linux.intel.com,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Raj, Ashok" <ashok.raj@intel.com>, "cai@lca.pw" <cai@lca.pw>,
"jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"Pan, Jacob jun" <jacob.jun.pan@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>
Subject: Re: [PATCH 5/6] iommu/vt-d: Cleanup after delegating DMA domain to generic iommu
Date: Tue, 11 Jun 2019 13:43:41 +0800 [thread overview]
Message-ID: <e7e4af38-97ab-9f15-4072-654f704c9f31@linux.intel.com> (raw)
In-Reply-To: <dbd8a4dcc9de6e7b3232c6c90597939a794860b9.camel@intel.com>
Hi,
On 6/11/19 3:25 AM, Sai Praneeth Prakhya wrote:
> On Mon, 2019-06-10 at 11:45 -0700, Mehta, Sohil wrote:
>> On Sun, 2019-06-09 at 10:38 +0800, Lu Baolu wrote:
>>> static int __init si_domain_init(int hw)
>>> @@ -3306,14 +3252,13 @@ static int __init init_dmars(void)
>>> if (pasid_supported(iommu))
>>> intel_svm_init(iommu);
>>> #endif
>>> - }
>>>
>>> - /*
>>> - * Now that qi is enabled on all iommus, set the root entry
>>> and flush
>>> - * caches. This is required on some Intel X58 chipsets,
>>> otherwise the
>>> - * flush_context function will loop forever and the boot
>>> hangs.
>>> - */
>>> - for_each_active_iommu(iommu, drhd) {
>>> + /*
>>> + * Now that qi is enabled on all iommus, set the root
>>> entry and
>>> + * flush caches. This is required on some Intel X58
>>> chipsets,
>>> + * otherwise the flush_context function will loop
>>> forever and
>>> + * the boot hangs.
>>> + */
>>> iommu_flush_write_buffer(iommu);
>>> iommu_set_root_entry(iommu);
>>> iommu->flush.flush_context(iommu, 0, 0, 0,
>>> DMA_CCMD_GLOBAL_INVL);
>>
>> This changes the intent of the original code. As the comment says
>> enable QI on all IOMMUs, then flush the caches and set the root entry.
>> The order of setting the root entries has changed now.
>>
>> Refer:
>> Commit a4c34ff1c029 ('iommu/vt-d: Enable QI on all IOMMUs before
>> setting root entry')
>
> Thanks Sohil! for catching the bug.
> Will send a V2 to Lu Baolu fixing this.
Okay, I will submit a v2 of this series later.
>
> Regards,
> Sai
Best regards,
Baolu
next prev parent reply other threads:[~2019-06-11 5:51 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-09 2:37 [PATCH 0/6] iommu/vt-d: Fixes and cleanups for linux-next Lu Baolu
2019-06-09 2:37 ` [PATCH 1/6] iommu/vt-d: Don't return error when device gets right domain Lu Baolu
2019-06-09 2:37 ` [PATCH 2/6] iommu/vt-d: Set domain type for a private domain Lu Baolu
2019-06-09 2:38 ` [PATCH 3/6] iommu/vt-d: Don't enable iommu's which have been ignored Lu Baolu
2019-06-09 2:38 ` [PATCH 4/6] iommu/vt-d: Fix suspicious RCU usage in probe_acpi_namespace_devices() Lu Baolu
2019-06-09 2:38 ` [PATCH 5/6] iommu/vt-d: Cleanup after delegating DMA domain to generic iommu Lu Baolu
2019-06-10 18:45 ` Mehta, Sohil
2019-06-10 19:25 ` Sai Praneeth Prakhya
2019-06-11 5:43 ` Lu Baolu [this message]
2019-06-09 2:38 ` [PATCH 6/6] iommu/vt-d: Consolidate domain_init() to avoid duplication Lu Baolu
2019-06-11 16:55 ` [PATCH 0/6] iommu/vt-d: Fixes and cleanups for linux-next Qian Cai
2019-06-11 23:40 ` Lu Baolu
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