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Patch the x86 platform driver to assign devices by index

llvm-11
Emery Hemingway 2 years ago
parent e9286cd9fa
commit 2925af0c89
  1. 2
      packages/genodelabs/depot-targets.nix
  2. 132
      packages/genodelabs/platform_drv.patch

@ -78,7 +78,7 @@ in {
noux.portInputs = [ libc ];
platform_drv = { };
platform_drv.patches = [ ./platform_drv.patch ];
posix = {
buildInputs = [ self.libc ];

@ -0,0 +1,132 @@
From f747e139da4fda694363a27010cb6d62c3b1e941 Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Tue, 10 Nov 2020 12:51:12 +0100
Subject: [PATCH 1/2] drivers/platform/x86: move PCI capabilities to PCI report
sub-nodes
---
.../os/src/drivers/platform/spec/x86/pci_session_component.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/repos/os/src/drivers/platform/spec/x86/pci_session_component.h b/repos/os/src/drivers/platform/spec/x86/pci_session_component.h
index a7439a224d..54b4492983 100644
--- a/repos/os/src/drivers/platform/spec/x86/pci_session_component.h
+++ b/repos/os/src/drivers/platform/spec/x86/pci_session_component.h
@@ -1110,7 +1110,9 @@ class Platform::Root : public Genode::Root_component<Session_component>
for (Genode::uint16_t val = 0; cap; cap = val >> 8) {
val = config.read(config_access, cap, Platform::Device::ACCESS_16BIT);
- xml.attribute("cap", String<8>(Hex(val & 0xff)));
+ xml.node("cap", [&] () {
+ xml.attribute("type", String<8>(Hex(val & 0xff)));
+ });
}
} catch (...) {
xml.attribute("cap", "failed to read");
--
2.28.0
From 1a687e4b6d3544bf369a01aeb1d8bdffc27139b1 Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Tue, 10 Nov 2020 14:46:59 +0100
Subject: [PATCH 2/2] drivers/platform/x86: assign device by optional index
Optionally assign PCI devices to sessions using indexes into the list of
devices matching that PCI class. This is configured by an "index"
attribute on <policy><pci/><policy> nodes. An index is not valid if the
"pci" node does not also contain a "class" attribute.
Fix #3946
---
repos/os/src/drivers/platform/spec/x86/README | 13 +++++++-----
.../platform/spec/x86/pci_session_component.h | 20 +++++++++++++++----
2 files changed, 24 insertions(+), 9 deletions(-)
diff --git a/repos/os/src/drivers/platform/spec/x86/README b/repos/os/src/drivers/platform/spec/x86/README
index 83649f3b33..1c605e93fd 100644
--- a/repos/os/src/drivers/platform/spec/x86/README
+++ b/repos/os/src/drivers/platform/spec/x86/README
@@ -59,11 +59,14 @@ Non PCI devices, as the PS2 controller are named by a "device" node in the polic
The first entry ('pci' or 'dev') of the policy node that matches will grant
-access of a device or device class to the client. Subsequent entries will not
-be checked. If a 'bus', 'device', 'function' triple was specified in one of the
-policies and in another policy a fuzzy pci class alias which would include
-the device specified by the triple, the device will not appear during device
-discovery by the client with the fuzzy pci class policy.
+access of a device or device class to the client. If a 'pci' policy specifies
+'class' and 'index' attributes then the device will be selected by an index
+into the list of devices matching that class.
+
+If a 'bus', 'device', 'function' triple was specified in one of the policies
+and in another policy a fuzzy pci class alias which would include the device
+specified by the triple, the device will not appear during device discovery
+by the client with the fuzzy pci class policy.
By default the driver will try to use MSIs if the device and the used kernel
diff --git a/repos/os/src/drivers/platform/spec/x86/pci_session_component.h b/repos/os/src/drivers/platform/spec/x86/pci_session_component.h
index 54b4492983..b321df6fcb 100644
--- a/repos/os/src/drivers/platform/spec/x86/pci_session_component.h
+++ b/repos/os/src/drivers/platform/spec/x86/pci_session_component.h
@@ -379,7 +379,7 @@ class Platform::Session_component : public Genode::Rpc_object<Session>
/**
* Check according session policy device usage
*/
- bool permit_device(Bdf const bdf, unsigned class_code)
+ bool permit_device(Bdf const bdf, unsigned class_code, unsigned &class_index)
{
using namespace Genode;
@@ -404,6 +404,16 @@ class Platform::Session_component : public Genode::Rpc_object<Session>
if (class_sub_prog && (class_sub_prog ^ class_code) >> DONT_CHECK_PROGIF)
return;
+ /*
+ *if policy specifies an index into devices
+ * of this class and it doesn't match - deny
+ */
+ unsigned long policy_index = node.attribute_value("index", ~0UL);
+ if (policy_index != ~0UL) {
+ if (class_index++ != policy_index)
+ return;
+ }
+
/* if this bdf is used by some policy - deny */
if (find_dev_in_policy(bdf))
return;
@@ -535,9 +545,9 @@ class Platform::Session_component : public Genode::Rpc_object<Session>
throw Genode::Service_denied();
}
- /* sanity check that 'class' is the only attribute */
+ /* sanity check that 'class' and 'index' are the only attributes */
try {
- node.attribute(1);
+ node.attribute(node.has_attribute("index") ? 2 : 1);
Genode::error("'", _label, "' - attributes beside 'class' detected");
throw Genode::Service_denied();
}
@@ -663,6 +673,7 @@ class Platform::Session_component : public Genode::Rpc_object<Session>
*/
Device_config config;
+ unsigned class_index = 0;
while (true) {
function += 1;
if (!_pci_bus.find_next(bus, device, function, &config,
@@ -682,7 +693,8 @@ class Platform::Session_component : public Genode::Rpc_object<Session>
if (permit_device(Bdf { (unsigned)bus,
(unsigned)device,
(unsigned)function },
- config.class_code()))
+ config.class_code(),
+ class_index))
break;
}
--
2.28.0
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