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Message-ID: <20230713163626.31338-15-jim.cromie@gmail.com>
Date: Thu, 13 Jul 2023 10:36:19 -0600
From: Jim Cromie <jim.cromie@...il.com>
To: jbaron@...mai.com, daniel.vetter@...ll.ch,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
amd-gfx@...ts.freedesktop.org, intel-gvt-dev@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org
Cc: jani.nikula@...el.com, ville.syrjala@...ux.intel.com,
seanpaul@...omium.org, robdclark@...il.com,
gregkh@...uxfoundation.org, Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH v4 14/21] dyndbg: refactor ddebug_classparam_clamp_input
Extract input validation code, from param_set_dyndbg_module_classes()
(the sys-node >handler) to new: ddebug_classparam_clamp_input(kp),
call it from former. It takes kernel-param arg, so it can complain
about "foo: bad input".
Reuse ddparam_clamp_input(kp) in ddebug_sync_classbits(),
to validate inputs from parent's params, just like our own.
To support that reuse, alter ddebug_sync_classbits() and caller to
pass kp instead of kp->arg.
Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
lib/dynamic_debug.c | 66 ++++++++++++++++++++++++++++++---------------
1 file changed, 45 insertions(+), 21 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 8e7bf5e9388b..4743ac2972b1 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -649,6 +649,30 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
#define CLASSMAP_BITMASK(width) ((1UL << (width)) - 1)
+static void ddebug_class_param_clamp_input(unsigned long *inrep, const struct kernel_param *kp)
+{
+ const struct ddebug_class_param *dcp = kp->arg;
+ const struct ddebug_class_map *map = dcp->map;
+
+ switch (map->map_type) {
+ case DD_CLASS_TYPE_DISJOINT_BITS:
+ /* expect bits. mask and warn if too many */
+ if (*inrep & ~CLASSMAP_BITMASK(map->length)) {
+ pr_warn("%s: input: 0x%lx exceeds mask: 0x%lx, masking\n",
+ KP_NAME(kp), *inrep, CLASSMAP_BITMASK(map->length));
+ *inrep &= CLASSMAP_BITMASK(map->length);
+ }
+ break;
+ case DD_CLASS_TYPE_LEVEL_NUM:
+ /* input is bitpos, of highest verbosity to be enabled */
+ if (*inrep > map->length) {
+ pr_warn("%s: level:%ld exceeds max:%d, clamping\n",
+ KP_NAME(kp), *inrep, map->length);
+ *inrep = map->length;
+ }
+ break;
+ }
+}
static int param_set_dyndbg_module_classes(const char *instr,
const struct kernel_param *kp,
const char *modnm)
@@ -668,26 +692,15 @@ static int param_set_dyndbg_module_classes(const char *instr,
pr_err("expecting numeric input, not: %s > %s\n", instr, KP_NAME(kp));
return -EINVAL;
}
+ ddebug_class_param_clamp_input(&inrep, kp);
switch (map->map_type) {
case DD_CLASS_TYPE_DISJOINT_BITS:
- /* expect bits. mask and warn if too many */
- if (inrep & ~CLASSMAP_BITMASK(map->length)) {
- pr_warn("%s: input: 0x%lx exceeds mask: 0x%lx, masking\n",
- KP_NAME(kp), inrep, CLASSMAP_BITMASK(map->length));
- inrep &= CLASSMAP_BITMASK(map->length);
- }
v2pr_info("bits:0x%lx > %s.%s\n", inrep, modnm ?: "*", KP_NAME(kp));
totct += ddebug_apply_class_bitmap(dcp, &inrep, *dcp->bits, modnm);
*dcp->bits = inrep;
break;
case DD_CLASS_TYPE_LEVEL_NUM:
- /* input is bitpos, of highest verbosity to be enabled */
- if (inrep > map->length) {
- pr_warn("%s: level:%ld exceeds max:%d, clamping\n",
- KP_NAME(kp), inrep, map->length);
- inrep = map->length;
- }
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
new_bits = CLASSMAP_BITMASK(inrep);
v2pr_info("lvl:%ld bits:0x%lx > %s\n", inrep, new_bits, KP_NAME(kp));
@@ -1147,16 +1160,27 @@ static const char* ddebug_classmap_typenames[] = {
v2pr_info(_msg " module:%s base:%d len:%d type:%s\n", ##__VA_ARGS__, \
cm->mod_name, cm->base, cm->length, ddebug_classmap_typenames[cm->map_type])
-static void ddebug_sync_classbits(const struct ddebug_class_param *dcp, const char *modname)
+static void ddebug_sync_classbits(const struct kernel_param *kp, const char *modname)
{
- /* clamp initial bitvec, mask off hi-bits */
- if (*dcp->bits & ~CLASSMAP_BITMASK(dcp->map->length)) {
- *dcp->bits &= CLASSMAP_BITMASK(dcp->map->length);
- v2pr_info("preset classbits: %lx\n", *dcp->bits);
+ struct ddebug_class_param *dcp = kp->arg;
+ unsigned long new_bits;
+
+ ddebug_class_param_clamp_input(dcp->bits, kp);
+
+ switch (dcp->map->map_type) {
+ case DD_CLASS_TYPE_DISJOINT_BITS:
+ v2pr_info("%s: classbits: 0x%lx\n", KP_NAME(kp), *dcp->bits);
+ ddebug_apply_class_bitmap(dcp, dcp->bits, 0UL, modname);
+ break;
+ case DD_CLASS_TYPE_LEVEL_NUM:
+ new_bits = CLASSMAP_BITMASK(*dcp->lvl);
+ v2pr_info("%s: lvl:%ld bits:0x%lx \n", KP_NAME(kp), *dcp->lvl, new_bits);
+ ddebug_apply_class_bitmap(dcp, &new_bits, 0UL, modname);
+ break;
+ default:
+ pr_err("bad map type %d\n", dcp->map->map_type);
+ return;
}
- /* force class'd prdbgs (in USEr module) to match (DEFINEr module) class-param */
- ddebug_apply_class_bitmap(dcp, dcp->bits, ~0, modname);
- ddebug_apply_class_bitmap(dcp, dcp->bits, 0, modname);
}
static void ddebug_match_apply_kparam(const struct kernel_param *kp, const struct ddebug_class_map *map, const char *modnm)
@@ -1171,7 +1195,7 @@ static void ddebug_match_apply_kparam(const struct kernel_param *kp, const struc
if (map == dcp->map) {
v2pr_info("found kp:%s =0x%lx", kp->name, *dcp->bits);
vpr_cm_info(map, "mapped to:");
- ddebug_sync_classbits(dcp, modnm);
+ ddebug_sync_classbits(kp, modnm);
}
}
--
2.41.0
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