lib/vsprintf: Add %pfw conversion specifier for printing fwnode names

Add support for %pfw conversion specifier (with "f" and "P" modifiers) to
support printing full path of the node, including its name ("f") and only
the node's name ("P") in the printk family of functions. The two flags
have equivalent functionality to existing %pOF with the same two modifiers
("f" and "P") on OF based systems. The ability to do the same on ACPI
based systems is added by this patch.

On ACPI based systems the resulting strings look like

	\_SB.PCI0.CIO2.port@1.endpoint@0

where the nodes are separated by a dot (".") and the first three are
ACPI device nodes and the latter two ACPI data nodes.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sakari Ailus 2019-10-03 15:32:18 +03:00 committed by Rafael J. Wysocki
parent 83abc5a77f
commit 3bd32d6a2e
3 changed files with 66 additions and 2 deletions

View File

@ -418,6 +418,30 @@ Examples::
Passed by reference. Passed by reference.
Fwnode handles
--------------
::
%pfw[fP]
For printing information on fwnode handles. The default is to print the full
node name, including the path. The modifiers are functionally equivalent to
%pOF above.
- f - full name of the node, including the path
- P - the name of the node including an address (if there is one)
Examples (ACPI)::
%pfwf \_SB.PCI0.CIO2.port@1.endpoint@0 - Full node name
%pfwP endpoint@0 - Node name
Examples (OF)::
%pfwf /ocp@68000000/i2c@48072000/camera@10/port/endpoint - Full name
%pfwP endpoint - Node name
Time and date (struct rtc_time) Time and date (struct rtc_time)
------------------------------- -------------------------------

View File

@ -1991,6 +1991,36 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
return widen_string(buf, buf - buf_start, end, spec); return widen_string(buf, buf - buf_start, end, spec);
} }
static noinline_for_stack
char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
struct printf_spec spec, const char *fmt)
{
struct printf_spec str_spec = spec;
char *buf_start = buf;
str_spec.field_width = -1;
if (*fmt != 'w')
return error_string(buf, end, "(%pf?)", spec);
if (check_pointer(&buf, end, fwnode, spec))
return buf;
fmt++;
switch (*fmt) {
case 'P': /* name */
buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
break;
case 'f': /* full_name */
default:
buf = fwnode_full_name_string(fwnode, buf, end);
break;
}
return widen_string(buf, buf - buf_start, end, spec);
}
/* /*
* Show a '%p' thing. A kernel extension is that the '%p' is followed * Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of alphanumeric characters that are extended format * by an extra set of alphanumeric characters that are extended format
@ -2095,6 +2125,10 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
* F device node flags * F device node flags
* c major compatible string * c major compatible string
* C full compatible string * C full compatible string
* - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer
* Without an option prints the full name of the node
* f full name
* P node name, including a possible unit address
* - 'x' For printing the address. Equivalent to "%lx". * - 'x' For printing the address. Equivalent to "%lx".
* *
* ** When making changes please also update: * ** When making changes please also update:
@ -2170,6 +2204,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return flags_string(buf, end, ptr, spec, fmt); return flags_string(buf, end, ptr, spec, fmt);
case 'O': case 'O':
return device_node_string(buf, end, ptr, spec, fmt + 1); return device_node_string(buf, end, ptr, spec, fmt + 1);
case 'f':
return fwnode_string(buf, end, ptr, spec, fmt + 1);
case 'x': case 'x':
return pointer_string(buf, end, ptr, spec); return pointer_string(buf, end, ptr, spec);
} }

View File

@ -6015,14 +6015,18 @@ sub process {
for (my $count = $linenr; $count <= $lc; $count++) { for (my $count = $linenr; $count <= $lc; $count++) {
my $specifier; my $specifier;
my $extension; my $extension;
my $qualifier;
my $bad_specifier = ""; my $bad_specifier = "";
my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0)); my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0));
$fmt =~ s/%%//g; $fmt =~ s/%%//g;
while ($fmt =~ /(\%[\*\d\.]*p(\w))/g) { while ($fmt =~ /(\%[\*\d\.]*p(\w)(\w*))/g) {
$specifier = $1; $specifier = $1;
$extension = $2; $extension = $2;
if ($extension !~ /[SsBKRraEhMmIiUDdgVCbGNOxt]/) { $qualifier = $3;
if ($extension !~ /[SsBKRraEhMmIiUDdgVCbGNOxtf]/ ||
($extension eq "f" &&
defined $qualifier && $qualifier !~ /^w/)) {
$bad_specifier = $specifier; $bad_specifier = $specifier;
last; last;
} }