565 lines
26 KiB
Zig
565 lines
26 KiB
Zig
//! /system/services/device-manager — the ring-3 process that turns the device
|
|
//! tree into a running system: **the matcher and the supervisor**
|
|
//! (docs/device-manager.md). The kernel enumerates the hardware and enforces the
|
|
//! claim capability (mechanism); this decides which driver serves which device,
|
|
//! spawns it, and keeps it alive (policy). Keeping that split in user space is
|
|
//! the whole point of the microkernel: the manager is an ordinary, restartable
|
|
//! process with no special privilege.
|
|
//!
|
|
//! M18.1 (this increment): the manager is a harness service on the well-known
|
|
//! `.device_manager` endpoint. Every driver is spawned **supervised** — exit
|
|
//! notifications land in the same loop as protocol messages. Drivers with an
|
|
//! assignment must `hello` within a deadline or be stopped; a driver that dies
|
|
//! is restarted with backoff, and a crash loop (three fast deaths) marks it
|
|
//! failed instead of respawning forever. Exit reasons (M17.2) drive the
|
|
//! decision: a clean exit meant to stop; only faults and missed deadlines
|
|
//! restart. Tree reports (`child_added`) land in M18.2.
|
|
|
|
const std = @import("std");
|
|
const device = @import("driver");
|
|
const ipc = @import("ipc");
|
|
const process = @import("process");
|
|
const service = @import("service");
|
|
const time = @import("time");
|
|
const memory = @import("memory");
|
|
const logging = @import("logging");
|
|
const device_manager_protocol = @import("device-manager-protocol");
|
|
const envelope = @import("envelope");
|
|
const registry = @import("device-registry");
|
|
|
|
/// The generated device-manager dispatch, plus the subscriber machinery the
|
|
/// harness owns (P4c): the watcher table, the reserved `subscribe` verb, the
|
|
/// exit sweep, and the fan-out. One manager per system, so the handler context is
|
|
/// empty and the tables stay in this file's globals.
|
|
const Serve = service.Subscribers(device_manager_protocol.Protocol, void);
|
|
|
|
const Invocation = envelope.Invocation;
|
|
const Answer = envelope.Answer;
|
|
const fs = @import("file-system");
|
|
|
|
// --- the device registry ------------------------------------------------------
|
|
// Driver matching is data-driven and authoritative: /system/configuration/devices.csv (parsed by
|
|
// the device-registry module) names, per bus, which driver binds a reported
|
|
// device, the most-specific match winning. There is no compiled-in fallback — a
|
|
// device no row matches goes unbound and is logged. This retired the hand-kept
|
|
// pciDriverForIdentity / hidDriverFor / usbDriverForIdentity switch tables
|
|
// (docs/device-manager.md: "matching stays code until the third bus").
|
|
|
|
/// The CSV bytes, held for the life of the process because the parsed rules'
|
|
/// string fields (hid, driver) slice into this buffer.
|
|
var registry_source: [8192]u8 = undefined;
|
|
var registry_rules: [64]registry.Rule = undefined;
|
|
var registry_count: usize = 0;
|
|
|
|
/// Read and parse /system/configuration/devices.csv once at boot. The file lives in the initial
|
|
/// ramdisk, which the kernel serves directly — no filesystem service need be up
|
|
/// (fat is spawned after the manager), so this is a plain fs.open + read.
|
|
fn loadRegistry() void {
|
|
var file = fs.open("/system/configuration/devices.csv", .{}) orelse {
|
|
_ = logging.write("/system/services/device-manager: /system/configuration/devices.csv missing — nothing will match\n");
|
|
return;
|
|
};
|
|
defer file.close();
|
|
var used: usize = 0;
|
|
while (used < registry_source.len) {
|
|
const n = file.read(registry_source[used..]) orelse break;
|
|
if (n == 0) break;
|
|
used += n;
|
|
}
|
|
const result = registry.parse(registry_source[0..used], ®istry_rules);
|
|
registry_count = result.count;
|
|
if (result.malformed != 0) std.log.info("/system/configuration/devices.csv: {d} malformed line(s) skipped", .{result.malformed});
|
|
if (result.truncated) _ = logging.write("/system/services/device-manager: /system/configuration/devices.csv has more rules than the table holds\n");
|
|
std.log.info("/system/configuration/devices.csv: {d} rule(s) loaded", .{registry_count});
|
|
}
|
|
|
|
/// Build a registry Identity from a bus driver's report: the bus it named, the
|
|
/// class triple unpacked from `identity` (0xCCSSPP — the same packing for a PCI
|
|
/// class code and a USB class triple), the widened numeric ids, and the ACPI hid.
|
|
fn identityFromReport(report: device_manager_protocol.ChildAdded) registry.Identity {
|
|
const bus: registry.Bus = switch (report.bus) {
|
|
@intFromEnum(device_manager_protocol.BusKind.pci) => .pci,
|
|
@intFromEnum(device_manager_protocol.BusKind.usb) => .usb,
|
|
@intFromEnum(device_manager_protocol.BusKind.acpi) => .acpi,
|
|
else => .unknown,
|
|
};
|
|
const hid_len = std.mem.indexOfScalar(u8, &report.hid, 0) orelse report.hid.len;
|
|
return .{
|
|
.bus = bus,
|
|
.base = @truncate(report.identity >> 16),
|
|
.subclass = @truncate(report.identity >> 8),
|
|
.prog_if = @truncate(report.identity),
|
|
.vendor = report.vendor,
|
|
.device = report.device,
|
|
.subsystem = report.subsystem,
|
|
.hid = report.hid[0..hid_len],
|
|
};
|
|
}
|
|
|
|
/// Whether some driver entry already serves registered device `device_id` —
|
|
/// a re-report after a bus restart must not spawn a second instance.
|
|
fn driverForDevice(device_id: u64) bool {
|
|
for (&drivers) |*driver| {
|
|
if (driver.used and driver.device_id == device_id) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// --- supervision -------------------------------------------------------------
|
|
|
|
/// How long a protocol driver has to hello after its spawn.
|
|
const hello_deadline_ms: u64 = 3000;
|
|
/// Deaths faster than this count toward the crash loop; slower ones reset it.
|
|
const fast_death_ns: u64 = 2_000_000_000;
|
|
/// Consecutive fast deaths before the manager gives up on a driver.
|
|
const crash_loop_cap: u32 = 3;
|
|
/// Restart backoff: base << (restarts - 1), so 300 ms, 600 ms, 1200 ms.
|
|
const backoff_base_ms: u64 = 300;
|
|
|
|
const DriverState = enum {
|
|
awaiting_hello, // spawned; the deadline is armed (protocol drivers only)
|
|
running,
|
|
restarting, // dead; respawn due at restart_due_ns
|
|
stopped, // exited cleanly — it meant to; not restarted
|
|
failed, // crash loop, or unspawnable; the manager gave up
|
|
};
|
|
|
|
const Driver = struct {
|
|
used: bool = false,
|
|
name_buffer: [64]u8 = undefined, // fits a full binary path (abi.maximum_process_name)
|
|
name_len: usize = 0,
|
|
// The assigned device id (becomes argv[1]), or device_manager_protocol.no_device.
|
|
device_id: u64 = device_manager_protocol.no_device,
|
|
// Whether this driver speaks the protocol (hello expected, deadline
|
|
// enforced). Legacy drivers (e.g. ps2-bus) are supervised and restarted
|
|
// but not yet required to hello.
|
|
speaks_protocol: bool = false,
|
|
process_id: u32 = 0,
|
|
state: DriverState = .running,
|
|
restarts: u32 = 0,
|
|
spawn_ns: u64 = 0,
|
|
hello_deadline_ns: u64 = 0,
|
|
restart_due_ns: u64 = 0,
|
|
|
|
fn name(driver: *const Driver) []const u8 {
|
|
return driver.name_buffer[0..driver.name_len];
|
|
}
|
|
};
|
|
|
|
const maximum_drivers = 16;
|
|
var drivers: [maximum_drivers]Driver = .{Driver{}} ** maximum_drivers;
|
|
var manager_endpoint: ipc.Handle = 0;
|
|
var test_restart_mode = false;
|
|
var test_usb_restart_mode = false;
|
|
var test_usb_killed = false;
|
|
var test_pci_restart_mode = false;
|
|
var test_scanout_restart_mode = false;
|
|
var test_scanout_killed = false;
|
|
var test_kill_pid: u32 = 0;
|
|
var test_kill_due_ns: u64 = 0;
|
|
|
|
/// The manager's mirror of what bus drivers report (docs/device-manager.md "the
|
|
/// tree"): the children, keyed by (parent, bus address), each remembering which
|
|
/// driver instance reported it — that is what death-pruning sweeps by.
|
|
const Child = struct {
|
|
used: bool = false,
|
|
parent: u64 = 0,
|
|
bus_address: u64 = 0,
|
|
identity: u64 = 0,
|
|
// The kernel device id (registered by the reporter), or device_manager_protocol.no_device.
|
|
device_id: u64 = 0,
|
|
reporter: u32 = 0, // the reporting driver instance's process id
|
|
};
|
|
|
|
const maximum_children = 64; // ACPI adds ~34 device nodes (M20.2), plus PCI + USB
|
|
var children: [maximum_children]Child = .{Child{}} ** maximum_children;
|
|
|
|
/// Record (or refresh) a reported child. Refreshing matters: a restarted bus
|
|
/// driver re-reports what it rediscovers, and the same (parent, port) must not
|
|
/// duplicate.
|
|
fn addChild(parent: u64, bus_address: u64, identity: u64, device_id: u64, reporter: u32) bool {
|
|
var free: ?*Child = null;
|
|
for (&children) |*child| {
|
|
if (child.used and child.parent == parent and child.bus_address == bus_address) {
|
|
child.identity = identity;
|
|
child.device_id = device_id;
|
|
child.reporter = reporter;
|
|
return true;
|
|
}
|
|
if (!child.used and free == null) free = child;
|
|
}
|
|
const slot = free orelse return false;
|
|
slot.* = .{ .used = true, .parent = parent, .bus_address = bus_address, .identity = identity, .device_id = device_id, .reporter = reporter };
|
|
return true;
|
|
}
|
|
|
|
/// Prune every child a dead driver instance reported: the children describe
|
|
/// protocol state (slots, rings) that died with the process — keeping the nodes
|
|
/// would be keeping a lie. The restarted instance rediscovers and re-reports.
|
|
/// Watchers hear the honest story: removed now, added again on rediscovery.
|
|
fn pruneChildrenOf(reporter: u32) void {
|
|
for (&children) |*child| {
|
|
if (child.used and child.reporter == reporter) {
|
|
std.log.info("child removed (device {d} port {d})", .{ child.parent, child.bus_address });
|
|
child.used = false;
|
|
Serve.publish(.child_removed, 0, .{ .parent = child.parent, .bus_address = child.bus_address });
|
|
}
|
|
}
|
|
}
|
|
|
|
/// How many children a driver instance has reported (the test-usb-restart
|
|
/// trigger counts these).
|
|
fn childCountOf(reporter: u32) u32 {
|
|
var n: u32 = 0;
|
|
for (&children) |*child| {
|
|
if (child.used and child.reporter == reporter) n += 1;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
/// The driver entry a live process id belongs to. Zero is not a process id here:
|
|
/// it is what `onDriverExit` writes back to retire an id it has already acted on,
|
|
/// so a second notification for the same death matches nothing.
|
|
fn driverByProcess(process_id: u32) ?*Driver {
|
|
if (process_id == 0) return null;
|
|
for (&drivers) |*driver| {
|
|
if (driver.used and driver.process_id == process_id) return driver;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/// Whether a singleton driver is already in the table (two ACPI nodes can both
|
|
/// map to ps2-bus; one instance serves both).
|
|
fn alreadySupervised(name: []const u8) bool {
|
|
for (&drivers) |*driver| {
|
|
if (driver.used and std.mem.eql(u8, driver.name(), name)) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Record a driver in the table and spawn its first instance.
|
|
fn addDriver(name: []const u8, device_id: u64, speaks_protocol: bool) void {
|
|
for (&drivers) |*driver| {
|
|
if (driver.used) continue;
|
|
const n = @min(name.len, driver.name_buffer.len);
|
|
@memcpy(driver.name_buffer[0..n], name[0..n]);
|
|
driver.name_len = n;
|
|
driver.device_id = device_id;
|
|
driver.speaks_protocol = speaks_protocol;
|
|
driver.used = true;
|
|
spawnDriver(driver);
|
|
return;
|
|
}
|
|
std.log.info("driver table full; cannot supervise {s}", .{name});
|
|
}
|
|
|
|
/// (Re)spawn a driver instance: supervised on the manager's own endpoint, the
|
|
/// device id as argv[1] when it has one, the hello deadline armed when it
|
|
/// speaks the protocol.
|
|
fn spawnDriver(driver: *Driver) void {
|
|
var id_text: [20]u8 = undefined;
|
|
var arguments: [1][]const u8 = undefined;
|
|
var argument_count: usize = 0;
|
|
if (driver.device_id != device_manager_protocol.no_device) {
|
|
arguments[0] = std.fmt.bufPrint(&id_text, "{d}", .{driver.device_id}) catch return;
|
|
argument_count = 1;
|
|
}
|
|
const child = process.spawnSupervised(driver.name(), arguments[0..argument_count], manager_endpoint) orelse {
|
|
std.log.info("failed to spawn {s}", .{driver.name()});
|
|
driver.state = .failed;
|
|
return;
|
|
};
|
|
driver.process_id = child;
|
|
driver.spawn_ns = time.clock();
|
|
if (driver.speaks_protocol) {
|
|
driver.state = .awaiting_hello;
|
|
driver.hello_deadline_ns = driver.spawn_ns + hello_deadline_ms * 1_000_000;
|
|
_ = time.timerOnce(manager_endpoint, hello_deadline_ms + 100);
|
|
} else {
|
|
driver.state = .running;
|
|
}
|
|
if (driver.device_id != device_manager_protocol.no_device) {
|
|
std.log.info("spawned {s} for device {d}", .{ driver.name(), driver.device_id });
|
|
} else {
|
|
std.log.info("spawned {s}", .{driver.name()});
|
|
}
|
|
}
|
|
|
|
/// A driver died. Prune what it reported first — then the exit reason (M17.2)
|
|
/// is the whole restart decision: a clean exit meant to stop; anything else
|
|
/// restarts with backoff until the crash-loop cap.
|
|
fn onDriverExit(driver: *Driver) void {
|
|
const dead = driver.process_id;
|
|
// One death, two notifications: the manager is this driver's supervisor (its
|
|
// spawn named this endpoint) *and*, since P4c put the watcher table in the
|
|
// harness, a subscriber to published exits. Both badges carry the same id, and
|
|
// the ring delivers them separately — so the id is retired here, before any
|
|
// decision is taken, and the second notification finds no driver to act on.
|
|
// Without this the backoff would count one death twice and the crash-loop cap
|
|
// would fire at half the deaths it names.
|
|
driver.process_id = 0;
|
|
pruneChildrenOf(dead);
|
|
const reason = process.exitReason(dead) orelse .fault;
|
|
if (reason == .exited) {
|
|
driver.state = .stopped;
|
|
std.log.info("{s} exited cleanly; not restarting", .{driver.name()});
|
|
return;
|
|
}
|
|
const now = time.clock();
|
|
const alive_ns = now - driver.spawn_ns;
|
|
driver.restarts = if (alive_ns < fast_death_ns) driver.restarts + 1 else 1;
|
|
if (driver.restarts >= crash_loop_cap) {
|
|
driver.state = .failed;
|
|
std.log.info("{s} is failing repeatedly (crash loop); giving up", .{driver.name()});
|
|
return;
|
|
}
|
|
const delay_ms = backoff_base_ms << @intCast(driver.restarts - 1);
|
|
driver.state = .restarting;
|
|
driver.restart_due_ns = now + delay_ms * 1_000_000;
|
|
std.log.info("restarting {s} in {d} ms (died: {s})", .{ driver.name(), delay_ms, @tagName(reason) });
|
|
_ = time.timerOnce(manager_endpoint, delay_ms + 50);
|
|
}
|
|
|
|
/// A timer landed: sweep every deadline. Overdue hellos are killed (the exit
|
|
/// notification then routes through the normal restart policy); due restarts
|
|
/// respawn. Timers carry no id on purpose — the table is the state, and one
|
|
/// sweep serves every armed deadline.
|
|
fn sweepDeadlines() void {
|
|
const now = time.clock();
|
|
if (test_kill_pid != 0 and now >= test_kill_due_ns) {
|
|
std.log.info("test mode: killing the reporter", .{});
|
|
_ = process.kill(test_kill_pid);
|
|
test_kill_pid = 0;
|
|
}
|
|
for (&drivers) |*driver| {
|
|
if (!driver.used) continue;
|
|
switch (driver.state) {
|
|
.awaiting_hello => if (now >= driver.hello_deadline_ns) {
|
|
std.log.info("{s} missed its hello deadline", .{driver.name()});
|
|
_ = process.kill(driver.process_id);
|
|
// The exit notification finishes the job via onDriverExit.
|
|
},
|
|
.restarting => if (now >= driver.restart_due_ns) spawnDriver(driver),
|
|
else => {},
|
|
}
|
|
}
|
|
}
|
|
|
|
// --- the harness callbacks -----------------------------------------------------
|
|
|
|
fn initialise(endpoint: ipc.Handle) bool {
|
|
manager_endpoint = endpoint;
|
|
|
|
// Load the authoritative driver-match registry before any bus driver can
|
|
// report a device to match against it.
|
|
loadRegistry();
|
|
|
|
// Enumerate into a heap buffer (too big for the one-page user stack).
|
|
const buffer = memory.allocator().alloc(device.DeviceDescriptor, 64) catch {
|
|
_ = logging.write("/system/services/device-manager: out of memory\n");
|
|
return false;
|
|
};
|
|
const total = device.enumerate(buffer);
|
|
const count = @min(total, buffer.len);
|
|
|
|
var matched: usize = 0;
|
|
for (buffer[0..count]) |descriptor| {
|
|
if (descriptor.class == @intFromEnum(device.DeviceClass.pci_host_bridge)) {
|
|
// The PCI bus driver: enumeration in ring 3 (M19), one instance
|
|
// per bridge, the bridge id as its assignment.
|
|
matched += 1;
|
|
addDriver("pci-bus", descriptor.id, true);
|
|
continue;
|
|
}
|
|
// Nothing else is matched from the boot snapshot today. The kernel-seeded
|
|
// HPET timer node is served by the kernel's own clock (docs/timers.md), not
|
|
// a user-space driver; PCI functions and PS/2 _HID devices arrive later as
|
|
// pci-bus / acpi-service reports and match in onChildAdded (docs/discovery.md).
|
|
// A fuller system's static class->driver manifest (docs/device-manager.md)
|
|
// would slot in here.
|
|
}
|
|
|
|
// The discovery service (docs/discovery.md): one per firmware, packed
|
|
// under the neutral name "discovery", spawned once at startup. It finds and
|
|
// claims the acpi-tables (or devicetree-blob) node itself. Not a per-device
|
|
// match — it is the discoverer, not a driver bound to one device.
|
|
addDriver("discovery", device_manager_protocol.no_device, false);
|
|
|
|
if (test_restart_mode) {
|
|
// The driver-restart scenario's fixture: claims device 0 (the tree
|
|
// root, otherwise unclaimed), hellos, then faults — driving backoff,
|
|
// re-claim-after-death, and the crash-loop cap deterministically.
|
|
addDriver("crash-test", 0, true);
|
|
}
|
|
|
|
if (matched == 0) {
|
|
_ = logging.write("/system/services/device-manager: no matchable devices\n");
|
|
} else {
|
|
_ = logging.write("/system/services/device-manager: ok\n");
|
|
}
|
|
return true;
|
|
}
|
|
|
|
fn onMessage(message: []const u8, reply: []u8, sender: u32, arrived: *ipc.Arrival) usize {
|
|
return Serve.dispatch({}, handlers, message, sender, arrived, reply);
|
|
}
|
|
|
|
/// `subscribe` and `unsubscribe` are absent on purpose: the harness answers both,
|
|
/// and its table is what `publish` fans out over.
|
|
const handlers = Serve.Handlers{
|
|
.hello = onHello,
|
|
.child_added = onChildAdded,
|
|
.child_removed = onChildRemoved,
|
|
.enumerate = onEnumerate,
|
|
};
|
|
|
|
/// The handshake. The device this driver was assigned is the packet's target.
|
|
fn onHello(_: void, invocation: Invocation(device_manager_protocol.Hello), _: Answer(void)) isize {
|
|
if (invocation.request.version != device_manager_protocol.version) {
|
|
std.log.info("refused hello (version {d}) from process {d}", .{ invocation.request.version, invocation.sender });
|
|
return -envelope.EPROTO;
|
|
}
|
|
const driver = driverByProcess(invocation.sender) orelse {
|
|
std.log.info("hello from unknown process {d}", .{invocation.sender});
|
|
return -envelope.EPERM;
|
|
};
|
|
driver.state = .running;
|
|
std.log.info("hello from {s} (device {d})", .{ driver.name(), invocation.target });
|
|
// Resilience drill (V6): once, kill the virtio-gpu driver a moment after it hellos, so
|
|
// the normal restart policy respawns it — the compositor must survive and re-attach.
|
|
if (test_scanout_restart_mode and !test_scanout_killed and std.mem.eql(u8, driver.name(), "/system/drivers/virtio-gpu")) {
|
|
test_scanout_killed = true;
|
|
test_kill_pid = invocation.sender;
|
|
test_kill_due_ns = time.clock() + 1_500_000_000;
|
|
_ = time.timerOnce(manager_endpoint, 1600);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/// A bus driver reported a discovered device: mirror it, publish it, match a
|
|
/// driver for it — and in the restart drills kill the reporter once, the
|
|
/// deterministic trigger for prune -> backoff -> respawn -> re-report.
|
|
fn onChildAdded(_: void, invocation: Invocation(device_manager_protocol.ChildAdded), _: Answer(void)) isize {
|
|
const report = invocation.request;
|
|
const sender = invocation.sender;
|
|
// The registered kernel device id is the packet's target, not a field: what
|
|
// the manager hands a matched driver as its argv assignment.
|
|
const device_id = invocation.target;
|
|
|
|
var status: isize = 0;
|
|
if (driverByProcess(sender)) |driver| {
|
|
if (!addChild(report.parent, report.bus_address, report.identity, device_id, sender)) status = -envelope.ENOSPC;
|
|
std.log.info("child added (device {d} port {d}, identity {d}) by {s}", .{ report.parent, report.bus_address, report.identity, driver.name() });
|
|
if (status == 0) Serve.publish(.child_added, device_id, report);
|
|
// Matching from reports (M19.3), now data-driven via the /system/configuration/devices.csv
|
|
// registry: a registered child gets the most-specific driver its identity
|
|
// matches, once — re-reports after a bus restart dedupe on the registered
|
|
// id, exactly like the registrations do.
|
|
if (status == 0 and device_id != device_manager_protocol.no_device) {
|
|
const id = identityFromReport(report);
|
|
if (registry.matchDriver(registry_rules[0..registry_count], id)) |match| {
|
|
if (match.ambiguous)
|
|
std.log.info("/system/configuration/devices.csv: multiple equally-specific rules match the device {s} reported; binding {s}", .{ driver.name(), match.driver });
|
|
if (id.bus == .acpi) {
|
|
// An hid-matched driver (ps2-bus) is a singleton that finds its
|
|
// own devices once spawned — spawn it once, no device assignment.
|
|
if (!alreadySupervised(match.driver)) addDriver(match.driver, device_manager_protocol.no_device, false);
|
|
} else {
|
|
// A per-device driver: one instance, the registered id as argv[1].
|
|
if (!driverForDevice(device_id)) addDriver(match.driver, device_id, true);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
status = -envelope.EPERM;
|
|
}
|
|
if (test_pci_restart_mode and !test_usb_killed) {
|
|
if (driverByProcess(sender)) |driver| {
|
|
if (std.mem.eql(u8, driver.name(), "pci-bus") and childCountOf(sender) >= 3) {
|
|
// The pci restart drill: kill the enumerator after it has
|
|
// reported; the respawn must re-register without duplicates
|
|
// (M19.0 idempotence, proven end to end by pci-scan).
|
|
test_usb_killed = true;
|
|
test_kill_pid = sender;
|
|
test_kill_due_ns = time.clock() + 1_000_000_000;
|
|
_ = time.timerOnce(manager_endpoint, 1100);
|
|
}
|
|
}
|
|
}
|
|
if (test_usb_restart_mode and !test_usb_killed and childCountOf(sender) >= 2) {
|
|
// Only the xHCI reporter is the drill's victim — pci-bus also reports
|
|
// now, and whichever finishes second must not trigger the kill.
|
|
if (driverByProcess(sender)) |driver| {
|
|
if (std.mem.eql(u8, driver.name(), "/system/drivers/usb-xhci-bus")) {
|
|
// Delayed, not immediate: the device-list scenario's subscriber
|
|
// needs a window to enumerate and subscribe before the events.
|
|
test_usb_killed = true;
|
|
test_kill_pid = sender;
|
|
test_kill_due_ns = time.clock() + 2_000_000_000;
|
|
_ = time.timerOnce(manager_endpoint, 2100);
|
|
}
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/// A bus driver reported a device gone (hot-unplug). Addressed by the composite
|
|
/// (parent, bus address) the reporter knows, which is why that pair is the
|
|
/// packet's body rather than its target.
|
|
fn onChildRemoved(_: void, invocation: Invocation(device_manager_protocol.ChildRemoved), _: Answer(void)) isize {
|
|
const report = invocation.request;
|
|
var status: isize = -envelope.ENOENT;
|
|
for (&children) |*child| {
|
|
if (child.used and child.parent == report.parent and child.bus_address == report.bus_address and child.reporter == invocation.sender) {
|
|
std.log.info("child removed (device {d} port {d})", .{ child.parent, child.bus_address });
|
|
child.used = false;
|
|
status = 0;
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/// The reserved `enumerate` verb: the mirror, one `ChildEntry` per known child,
|
|
/// packed into the reply's tail. How many arrived is the reply's own length —
|
|
/// `Status.len` — so no count header is spent saying it twice.
|
|
fn onEnumerate(_: void, _: Invocation(void), answer: Answer(void)) isize {
|
|
const entry_size = @sizeOf(device_manager_protocol.ChildEntry);
|
|
const tail = answer.tail();
|
|
var written: usize = 0;
|
|
for (&children) |*child| {
|
|
if (!child.used) continue;
|
|
if (written + entry_size > tail.len) break;
|
|
const entry = device_manager_protocol.ChildEntry{ .parent = child.parent, .bus_address = child.bus_address, .identity = child.identity };
|
|
@memcpy(tail[written..][0..entry_size], std.mem.asBytes(&entry));
|
|
written += entry_size;
|
|
}
|
|
return @intCast(written);
|
|
}
|
|
|
|
fn onNotification(badge: u64) void {
|
|
if (badge & ipc.notify_exit_bit != 0) {
|
|
const dead: u32 = @intCast(badge & ~(ipc.notify_badge_bit | ipc.notify_exit_bit));
|
|
// The harness has already swept the watcher table for this death; what is
|
|
// left is the manager's own concern, its supervised drivers.
|
|
if (driverByProcess(dead)) |driver| onDriverExit(driver);
|
|
return;
|
|
}
|
|
if (badge & ipc.notify_timer_bit != 0) sweepDeadlines();
|
|
}
|
|
|
|
pub fn main(init: process.Init) void {
|
|
if (init.arguments.get(1)) |mode| {
|
|
test_restart_mode = std.mem.eql(u8, mode, "test-restart");
|
|
test_usb_restart_mode = std.mem.eql(u8, mode, "test-usb-restart");
|
|
test_pci_restart_mode = std.mem.eql(u8, mode, "test-pci-restart");
|
|
test_scanout_restart_mode = std.mem.eql(u8, mode, "test-scanout-restart");
|
|
}
|
|
service.run(device_manager_protocol.message_maximum, .{
|
|
.service = "device-manager",
|
|
.init = initialise,
|
|
.on_message = onMessage,
|
|
.on_notification = onNotification,
|
|
.subscribers = Serve.hooks,
|
|
});
|
|
}
|