Changeset 832cbe7 in mainline for uspace/drv/bus/pci/pciintel/pci.h

Timestamp:

2025-02-05T12:30:20Z (7 days ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

master

Children:

accdf882

Parents:

0dab4850

git-author:

Jiri Svoboda <jiri@…> (2025-02-04 21:30:06)

git-committer:

Jiri Svoboda <jiri@…> (2025-02-05 12:30:20)

Message:

Add proper IDE PCI to ISA fallback mechanism.

To determine if legacy IDE I/O ports are free, isa-ide asks isa,
who asks pciintel. pciintel waits for bus enumeration to complete,
then waits for all functions except the one who is asking
(which is ISA bus) to stabilize. During attach pci-ide will claim
the legacy IDE ports. Thus, if at this point legacy IDE ports
are unclaimed, pciintel tells ISA they are free, which tells isa-ide,
which continues to attach. If they are not free, isa-ide will not
attach.

This works for all use cases, including system without PCI bus,
system with PCI bus, but no (or disabled) PCI IDE, system with PCI
IDE with unrecognized VID/PID (which we will handle in legacy ISA mode).

File:

• uspace/drv/bus/pci/pciintel/pci.h (modified) (4 diffs)

uspace/drv/bus/pci/pciintel/pci.h

@@ -1 +1 @@
 /*
+ * Copyright (c) 2025 Jiri Svoboda
  * Copyright (c) 2010 Lenka Trochtova
- * Copyright (c) 2011 Jiri Svoboda
  * All rights reserved.
  *
@@ -41 +41 @@
 #include <ddf/driver.h>
 #include <fibril_synch.h>
+#include <stdbool.h>
 
 #define PCI_MAX_HW_RES 10
@@ -54 +55 @@
         /** List of functions (of pci_fun_t) */
         list_t funs;
+        /** Enumeration is done */
+        bool enum_done;
+        /** Synchronize enum_done */
+        fibril_mutex_t enum_done_lock;
+        /** Signal change to enum_done */
+        fibril_condvar_t enum_done_cv;
+        /** @c true iff legacy IDE range is claimed by PCI IDE driver */
+        bool leg_ide_claimed;
 } pci_bus_t;
 
@@ -72 +81 @@
         uint8_t prog_if;
         uint8_t revision;
+        bool querying;
         hw_resource_list_t hw_resources;
         hw_resource_t resources[PCI_MAX_HW_RES];