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authorShayne Hartford2019-04-10 10:49:38 -0400
committerShayne Hartford2019-04-10 10:49:38 -0400
commit53faef76c4becc8e1030d1616db191a70e3b9e9f (patch)
treef0d0071c26748242d52eb4061beac695af67f5fb /add-acs-overrides.patch
downloadaur-53faef76c4becc8e1030d1616db191a70e3b9e9f.tar.gz
Added kernel
Diffstat (limited to 'add-acs-overrides.patch')
-rw-r--r--add-acs-overrides.patch443
1 files changed, 443 insertions, 0 deletions
diff --git a/add-acs-overrides.patch b/add-acs-overrides.patch
new file mode 100644
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+++ b/add-acs-overrides.patch
@@ -0,0 +1,443 @@
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+<table summary='blob content' class='blob'>
+<tr><td class='linenumbers'><pre><a id='n1' href='#n1'>1</a>
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+<a id='n193' href='#n193'>193</a>
+</pre></td>
+<td class='lines'><pre><code>From f56f33917f418568141184eb2503ec65309a8255 Mon Sep 17 00:00:00 2001
+From: Mark Weiman &lt;mark.weiman&#64;markzz.com&gt;
+Date: Thu, 13 Dec 2018 13:15:16 -0500
+Subject: [PATCH] pci: Enable overrides for missing ACS capabilities (4.18)
+
+This an updated version of Alex Williamson&apos;s patch from:
+https://lkml.org/lkml/2013/5/30/513
+
+Original commit message follows:
+<span class="hl kwa">---</span>
+PCIe ACS (Access Control Services) is the PCIe 2.0+ feature that
+allows us to control whether transactions are allowed to be redirected
+in various subnodes of a PCIe topology. For instance, if two
+endpoints are below a root port or downsteam switch port, the
+downstream port may optionally redirect transactions between the
+devices, bypassing upstream devices. The same can happen internally
+on multifunction devices. The transaction may never be visible to the
+upstream devices.
+
+One upstream device that we particularly care about is the IOMMU. If
+a redirection occurs in the topology below the IOMMU, then the IOMMU
+cannot provide isolation between devices. This is why the PCIe spec
+encourages topologies to include ACS support. Without it, we have to
+assume peer-to-peer DMA within a hierarchy can bypass IOMMU isolation.
+
+Unfortunately, far too many topologies do not support ACS to make this
+a steadfast requirement. Even the latest chipsets from Intel are only
+sporadically supporting ACS. We have trouble getting interconnect
+vendors to include the PCIe spec required PCIe capability, let alone
+suggested features.
+
+Therefore, we need to add some flexibility. The pcie_acs_override=
+boot option lets users opt-in specific devices or sets of devices to
+assume ACS support. The &quot;downstream&quot; option assumes full ACS support
+on root ports and downstream switch ports. The &quot;multifunction&quot;
+option assumes the subset of ACS features available on multifunction
+endpoints and upstream switch ports are supported. The &quot;id:nnnn:nnnn&quot;
+option enables ACS support on devices matching the provided vendor
+and device IDs, allowing more strategic ACS overrides. These options
+may be combined in any order. A maximum of 16 id specific overrides
+are available. It&apos;s suggested to use the most limited set of options
+necessary to avoid completely disabling ACS across the topology.
+Note to hardware vendors, we have facilities to permanently quirk
+specific devices which enforce isolation but not provide an ACS
+capability. Please contact me to have your devices added and save
+your customers the hassle of this boot option.
+<span class="hl kwa">---</span>
+ .../admin-guide/kernel-parameters.txt | 8 ++
+ drivers/pci/quirks.c | 102 ++++++++++++++++++
+ 2 files changed, 110 insertions(+)
+
+diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
+index 0c404cda531a..0d45f0014f4a 100644
+<span class="hl kwa">--- a/Documentation/admin-guide/kernel-parameters.txt</span>
+<span class="hl kwb">+++ b/Documentation/admin-guide/kernel-parameters.txt</span>
+<span class="hl kwd">&#64;&#64; -3165,6 +3165,14 &#64;&#64;</span>
+ nomsi [MSI] If the PCI_MSI kernel config parameter is
+ enabled, this kernel boot option can be used to
+ disable the use of MSI interrupts system-wide.
+<span class="hl kwb">+ pci_acs_override [PCIE] Override missing PCIe ACS support for:</span>
+<span class="hl kwb">+ downstream</span>
+<span class="hl kwb">+ All downstream ports - full ACS capabilities</span>
+<span class="hl kwb">+ multifunction</span>
+<span class="hl kwb">+ Add multifunction devices - multifunction ACS subset</span>
+<span class="hl kwb">+ id:nnnn:nnnn</span>
+<span class="hl kwb">+ Specific device - full ACS capabilities</span>
+<span class="hl kwb">+ Specified as vid:did (vendor/device ID) in hex</span>
+ noioapicquirk [APIC] Disable all boot interrupt quirks.
+ Safety option to keep boot IRQs enabled. This
+ should never be necessary.
+diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
+index c0673a717239..695d99b390f7 100644
+<span class="hl kwa">--- a/drivers/pci/quirks.c</span>
+<span class="hl kwb">+++ b/drivers/pci/quirks.c</span>
+&#64;&#64; -194,6 +194,106 &#64;&#64; static int __init pci_apply_final_quirks(void)
+ }
+ fs_initcall_sync(pci_apply_final_quirks);
+
+<span class="hl kwb">+static bool acs_on_downstream;</span>
+<span class="hl kwb">+static bool acs_on_multifunction;</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+#define NUM_ACS_IDS 16</span>
+<span class="hl kwb">+struct acs_on_id {</span>
+<span class="hl kwb">+ unsigned short vendor;</span>
+<span class="hl kwb">+ unsigned short device;</span>
+<span class="hl kwb">+};</span>
+<span class="hl kwb">+static struct acs_on_id acs_on_ids[NUM_ACS_IDS];</span>
+<span class="hl kwb">+static u8 max_acs_id;</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+static __init int pcie_acs_override_setup(char *p)</span>
+<span class="hl kwb">+{</span>
+<span class="hl kwb">+ if (!p)</span>
+<span class="hl kwb">+ return -EINVAL;</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ while (*p) {</span>
+<span class="hl kwb">+ if (!strncmp(p, &quot;downstream&quot;, 10))</span>
+<span class="hl kwb">+ acs_on_downstream = true;</span>
+<span class="hl kwb">+ if (!strncmp(p, &quot;multifunction&quot;, 13))</span>
+<span class="hl kwb">+ acs_on_multifunction = true;</span>
+<span class="hl kwb">+ if (!strncmp(p, &quot;id:&quot;, 3)) {</span>
+<span class="hl kwb">+ char opt[5];</span>
+<span class="hl kwb">+ int ret;</span>
+<span class="hl kwb">+ long val;</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ if (max_acs_id &gt;= NUM_ACS_IDS - 1) {</span>
+<span class="hl kwb">+ pr_warn(&quot;Out of PCIe ACS override slots (%d)\n&quot;,</span>
+<span class="hl kwb">+ NUM_ACS_IDS);</span>
+<span class="hl kwb">+ goto next;</span>
+<span class="hl kwb">+ }</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ p += 3;</span>
+<span class="hl kwb">+ snprintf(opt, 5, &quot;%s&quot;, p);</span>
+<span class="hl kwb">+ ret = kstrtol(opt, 16, &amp;val);</span>
+<span class="hl kwb">+ if (ret) {</span>
+<span class="hl kwb">+ pr_warn(&quot;PCIe ACS ID parse error %d\n&quot;, ret);</span>
+<span class="hl kwb">+ goto next;</span>
+<span class="hl kwb">+ }</span>
+<span class="hl kwb">+ acs_on_ids[max_acs_id].vendor = val;</span>
+<span class="hl kwb">+ p += strcspn(p, &quot;:&quot;);</span>
+<span class="hl kwb">+ if (*p != &apos;:&apos;) {</span>
+<span class="hl kwb">+ pr_warn(&quot;PCIe ACS invalid ID\n&quot;);</span>
+<span class="hl kwb">+ goto next;</span>
+<span class="hl kwb">+ }</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ p++;</span>
+<span class="hl kwb">+ snprintf(opt, 5, &quot;%s&quot;, p);</span>
+<span class="hl kwb">+ ret = kstrtol(opt, 16, &amp;val);</span>
+<span class="hl kwb">+ if (ret) {</span>
+<span class="hl kwb">+ pr_warn(&quot;PCIe ACS ID parse error %d\n&quot;, ret);</span>
+<span class="hl kwb">+ goto next;</span>
+<span class="hl kwb">+ }</span>
+<span class="hl kwb">+ acs_on_ids[max_acs_id].device = val;</span>
+<span class="hl kwb">+ max_acs_id++;</span>
+<span class="hl kwb">+ }</span>
+<span class="hl kwb">+next:</span>
+<span class="hl kwb">+ p += strcspn(p, &quot;,&quot;);</span>
+<span class="hl kwb">+ if (*p == &apos;,&apos;)</span>
+<span class="hl kwb">+ p++;</span>
+<span class="hl kwb">+ }</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ if (acs_on_downstream || acs_on_multifunction || max_acs_id)</span>
+<span class="hl kwb">+ pr_warn(&quot;Warning: PCIe ACS overrides enabled; This may allow non-IOMMU protected peer-to-peer DMA\n&quot;);</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ return 0;</span>
+<span class="hl kwb">+}</span>
+<span class="hl kwb">+early_param(&quot;pcie_acs_override&quot;, pcie_acs_override_setup);</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+static int pcie_acs_overrides(struct pci_dev *dev, u16 acs_flags)</span>
+<span class="hl kwb">+{</span>
+<span class="hl kwb">+ int i;</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ /* Never override ACS for legacy devices or devices with ACS caps */</span>
+<span class="hl kwb">+ if (!pci_is_pcie(dev) ||</span>
+<span class="hl kwb">+ pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS))</span>
+<span class="hl kwb">+ return -ENOTTY;</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ for (i = 0; i &lt; max_acs_id; i++)</span>
+<span class="hl kwb">+ if (acs_on_ids[i].vendor == dev-&gt;vendor &amp;&amp;</span>
+<span class="hl kwb">+ acs_on_ids[i].device == dev-&gt;device)</span>
+<span class="hl kwb">+ return 1;</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+switch (pci_pcie_type(dev)) {</span>
+<span class="hl kwb">+ case PCI_EXP_TYPE_DOWNSTREAM:</span>
+<span class="hl kwb">+ case PCI_EXP_TYPE_ROOT_PORT:</span>
+<span class="hl kwb">+ if (acs_on_downstream)</span>
+<span class="hl kwb">+ return 1;</span>
+<span class="hl kwb">+ break;</span>
+<span class="hl kwb">+ case PCI_EXP_TYPE_ENDPOINT:</span>
+<span class="hl kwb">+ case PCI_EXP_TYPE_UPSTREAM:</span>
+<span class="hl kwb">+ case PCI_EXP_TYPE_LEG_END:</span>
+<span class="hl kwb">+ case PCI_EXP_TYPE_RC_END:</span>
+<span class="hl kwb">+ if (acs_on_multifunction &amp;&amp; dev-&gt;multifunction)</span>
+<span class="hl kwb">+ return 1;</span>
+<span class="hl kwb">+ }</span>
+<span class="hl kwb">+</span>
+<span class="hl kwb">+ return -ENOTTY;</span>
+<span class="hl kwb">+}</span>
+<span class="hl kwb">+</span>
+ /*
+ * Decoding should be disabled for a PCI device during BAR sizing to avoid
+ * conflict. But doing so may cause problems on host bridge and perhaps other
+&#64;&#64; -4513,6 +4613,8 &#64;&#64; static const struct pci_dev_acs_enabled {
+ { PCI_VENDOR_ID_AMPERE, 0xE00A, pci_quirk_xgene_acs },
+ { PCI_VENDOR_ID_AMPERE, 0xE00B, pci_quirk_xgene_acs },
+ { PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs },
+<span class="hl kwb">+ /* allow acs for any */</span>
+<span class="hl kwb">+ { PCI_ANY_ID, PCI_ANY_ID, pcie_acs_overrides },</span>
+ { 0 }
+ };
+
+<span class="hl kwa">-- </span>
+2.20.0
+
+</code></pre></td></tr></table>
+</div> <!-- class=content -->
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+ <p>
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