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drm: Simplify stacktrace handling 

Replace the indirection through struct stack_trace by using the storage
array based interfaces.

The original code in all printing functions is really wrong. It allocates a
storage array on stack which is unused because depot_fetch_stack() does not
store anything in it. It overwrites the entries pointer in the stack_trace
struct so it points to the depot storage.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: intel-gfx@lists.freedesktop.org
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: linux-mm@kvack.org
Cc: David Rientjes <rientjes@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: kasan-dev@googlegroups.com
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: iommu@lists.linux-foundation.org
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: David Sterba <dsterba@suse.com>
Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: linux-btrfs@vger.kernel.org
Cc: dm-devel@redhat.com
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: linux-arch@vger.kernel.org
Link: https://lkml.kernel.org/r/20190425094802.622094226@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-04-25 11:45:09 +02:00
parent be9c52ed84
commit 487f3c7fb1
3 changed files with 18 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/gpu/drm/drm_mm.c
View File

@ -106,22 +106,19 @@
static noinline void save_stack(struct drm_mm_node *node)
{
unsigned long entries[STACKDEPTH];
struct stack_trace trace = {
.entries = entries,
.max_entries = STACKDEPTH,
.skip = 1
};
unsigned int n;
save_stack_trace(&trace);
n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
/* May be called under spinlock, so avoid sleeping */
node->stack = depot_save_stack(&trace, GFP_NOWAIT);
node->stack = stack_depot_save(entries, n, GFP_NOWAIT);
}
static void show_leaks(struct drm_mm *mm)
{
struct drm_mm_node *node;
unsigned long entries[STACKDEPTH];
unsigned long *entries;
unsigned int nr_entries;
char *buf;
buf = kmalloc(BUFSZ, GFP_KERNEL);
@ -129,19 +126,14 @@ static void show_leaks(struct drm_mm *mm)
return;
list_for_each_entry(node, drm_mm_nodes(mm), node_list) {
struct stack_trace trace = {
.entries = entries,
.max_entries = STACKDEPTH
};
if (!node->stack) {
DRM_ERROR("node [%08llx + %08llx]: unknown owner\n",
node->start, node->size);
continue;
}
depot_fetch_stack(node->stack, &trace);
snprint_stack_trace(buf, BUFSZ, &trace, 0);
nr_entries = stack_depot_fetch(node->stack, &entries);
stack_trace_snprint(buf, BUFSZ, entries, nr_entries, 0);
DRM_ERROR("node [%08llx + %08llx]: inserted at\n%s",
node->start, node->size, buf);
}

11
drivers/gpu/drm/i915/i915_vma.c
View File

@ -36,11 +36,8 @@
static void vma_print_allocator(struct i915_vma *vma, const char *reason)
{
unsigned long entries[12];
struct stack_trace trace = {
.entries = entries,
.max_entries = ARRAY_SIZE(entries),
};
unsigned long *entries;
unsigned int nr_entries;
char buf[512];
if (!vma->node.stack) {
@ -49,8 +46,8 @@ static void vma_print_allocator(struct i915_vma *vma, const char *reason)
return;
}
depot_fetch_stack(vma->node.stack, &trace);
snprint_stack_trace(buf, sizeof(buf), &trace, 0);
nr_entries = stack_depot_fetch(vma->node.stack, &entries);
stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
vma->node.start, vma->node.size, reason, buf);
}

21
drivers/gpu/drm/i915/intel_runtime_pm.c
View File

@ -60,27 +60,20 @@
static noinline depot_stack_handle_t __save_depot_stack(void)
{
unsigned long entries[STACKDEPTH];
struct stack_trace trace = {
.entries = entries,
.max_entries = ARRAY_SIZE(entries),
.skip = 1,
};
unsigned int n;
save_stack_trace(&trace);
return depot_save_stack(&trace, GFP_NOWAIT | __GFP_NOWARN);
n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
return stack_depot_save(entries, n, GFP_NOWAIT | __GFP_NOWARN);
}
static void __print_depot_stack(depot_stack_handle_t stack,
char *buf, int sz, int indent)
{
unsigned long entries[STACKDEPTH];
struct stack_trace trace = {
.entries = entries,
.max_entries = ARRAY_SIZE(entries),
};
unsigned long *entries;
unsigned int nr_entries;
depot_fetch_stack(stack, &trace);
snprint_stack_trace(buf, sz, &trace, indent);
nr_entries = stack_depot_fetch(stack, &entries);
stack_trace_snprint(buf, sz, entries, nr_entries, indent);
}
static void init_intel_runtime_pm_wakeref(struct drm_i915_private *i915)