From fa1823688adaaf8dc32293b3502da7257cec612c Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Tue, 12 Feb 2008 09:06:27 +0100
Subject: [PATCH] Added a simple infrastructure for setting of arbitrary
 parameters.

---
 TODO           |  1 +
 lib/init.c     | 75 +++++++++++++++++++++++++++++++++++++++++++++++++-
 lib/internal.h |  5 +++-
 lib/pci.h      | 17 ++++++++++++
 4 files changed, 96 insertions(+), 2 deletions(-)

diff --git a/TODO b/TODO
index 9bdedbb..81053e8 100644
--- a/TODO
+++ b/TODO
@@ -6,6 +6,7 @@ DNS mode:
 - check handling of network errors
 - try to avoid libresolv.a
 - replace "Unknown device" with "Device"
+- check the logic around id_load_failed
 
 Capabilities with partial decoding:
 - PCIe 2nd set of control/status registers (have spec)
diff --git a/lib/init.c b/lib/init.c
index 6366762..11a9af6 100644
--- a/lib/init.c
+++ b/lib/init.c
@@ -92,6 +92,15 @@ pci_mfree(void *x)
     free(x);
 }
 
+char *
+pci_strdup(struct pci_access *a, char *s)
+{
+  int len = strlen(s) + 1;
+  char *t = pci_malloc(a, len);
+  memcpy(t, s, len);
+  return t;
+}
+
 static void
 pci_generic_error(char *msg, ...)
 {
@@ -130,6 +139,70 @@ pci_null_debug(char *msg UNUSED, ...)
 {
 }
 
+char *
+pci_get_param(struct pci_access *acc, char *param)
+{
+  struct pci_param *p;
+
+  for (p=acc->params; p; p=p->next)
+    if (!strcmp(p->param, param))
+      return p->value;
+  return NULL;
+}
+
+void
+pci_define_param(struct pci_access *acc, char *param, char *value)
+{
+  struct pci_param *p = pci_malloc(acc, sizeof(*p));
+
+  p->next = acc->params;
+  acc->params = p;
+  p->param = param;
+  p->value = value;
+  p->value_malloced = 0;
+}
+
+int
+pci_set_param(struct pci_access *acc, char *param, char *value)
+{
+  struct pci_param *p;
+
+  for (p=acc->params; p; p=p->next)
+    if (!strcmp(p->param, param))
+      {
+	if (p->value_malloced)
+	  pci_mfree(p->value);
+	p->value_malloced = 1;
+	p->value = pci_strdup(acc, value);
+	return 0;
+      }
+  return -1;
+}
+
+static void
+pci_free_params(struct pci_access *acc)
+{
+  struct pci_param *p;
+
+  while (p = acc->params)
+    {
+      acc->params = p->next;
+      if (p->value_malloced)
+	pci_mfree(p->value);
+      pci_mfree(p);
+    }
+}
+
+struct pci_param *
+pci_walk_params(struct pci_access *acc, struct pci_param *prev)
+{
+  /* So far, the params form a simple linked list, but this can change in the future */
+  if (!prev)
+    return acc->params;
+  else
+    return prev->next;
+}
+
 void
 pci_init(struct pci_access *a)
 {
@@ -184,9 +257,9 @@ pci_cleanup(struct pci_access *a)
   if (a->methods)
     a->methods->cleanup(a);
   pci_free_name_list(a);
+  pci_free_params(a);
   pci_set_name_list_path(a, NULL, 0);
   pci_set_net_domain(a, NULL, 0);
   pci_set_id_cache(a, NULL, 0);
   pci_mfree(a);
 }
-
diff --git a/lib/internal.h b/lib/internal.h
index 925eac1..bc88f36 100644
--- a/lib/internal.h
+++ b/lib/internal.h
@@ -1,7 +1,7 @@
 /*
  *	The PCI Library -- Internal Stuff
  *
- *	Copyright (c) 1997--2004 Martin Mares <mj@ucw.cz>
+ *	Copyright (c) 1997--2008 Martin Mares <mj@ucw.cz>
  *
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
@@ -31,10 +31,13 @@ int pci_generic_block_write(struct pci_dev *, int pos, byte *buf, int len);
 
 void *pci_malloc(struct pci_access *, int);
 void pci_mfree(void *);
+char *pci_strdup(struct pci_access *a, char *s);
 
 struct pci_dev *pci_alloc_dev(struct pci_access *);
 int pci_link_dev(struct pci_access *, struct pci_dev *);
 
+void pci_define_param(struct pci_access *acc, char *param, char *val);
+
 extern struct pci_methods pm_intel_conf1, pm_intel_conf2, pm_linux_proc,
 	pm_fbsd_device, pm_aix_device, pm_nbsd_libpci, pm_obsd_device,
 	pm_dump, pm_linux_sysfs;
diff --git a/lib/pci.h b/lib/pci.h
index 9bf8022..1540ee1 100644
--- a/lib/pci.h
+++ b/lib/pci.h
@@ -65,6 +65,7 @@ struct pci_access {
 
   /* Fields used internally: */
   struct pci_methods *methods;
+  struct pci_param *params;
   struct id_entry **id_hash;		/* names.c */
   struct id_bucket *current_id_bucket;
   int id_load_failed;
@@ -85,6 +86,22 @@ void pci_scan_bus(struct pci_access *acc);
 struct pci_dev *pci_get_dev(struct pci_access *acc, int domain, int bus, int dev, int func); /* Raw access to specified device */
 void pci_free_dev(struct pci_dev *);
 
+/*
+ *	Named parameters
+ */
+
+struct pci_param {
+  struct pci_param *next;		/* Please use pci_walk_params() for traversing the list */
+  char *param;				/* Name of the parameter */
+  char *value;				/* Value of the parameter */
+  int value_malloced;			/* used internally */
+};
+
+char *pci_get_param(struct pci_access *acc, char *param);
+int pci_set_param(struct pci_access *acc, char *param, char *value);	/* 0 on success, -1 if no such parameter */
+/* To traverse the list, call pci_walk_params repeatedly, first with prev=NULL, and do not modify the parameters during traversal. */
+struct pci_param *pci_walk_params(struct pci_access *acc, struct pci_param *prev);
+
 /*
  *	Devices
  */
-- 
2.39.2