Re: The issue with page allocation 5.3 rc1-rc2 (seems drm culprit here)

[Alex Deucher]

On Thu, Aug 8, 2019 at 4:13 AM Michel DÃnzer <michel@xxxxxxxxxxx> wrote:
>
> On 2019-08-08 7:31 a.m., Alex Deucher wrote:
> > On Wed, Aug 7, 2019 at 11:49 PM Mikhail Gavrilov
> > <mikhail.v.gavrilov@xxxxxxxxx> wrote:
> >>
> >> Unfortunately error "gnome-shell: page allocation failure: order:4,
> >> mode:0x40cc0(GFP_KERNEL|__GFP_COMP),
> >> nodemask=(null),cpuset=/,mems_allowed=0" still happens even with
> >> applying this patch.
> >
> > I think we can just drop the kmalloc altogether.  How about this patch?
>
> Memory allocated by kvz/malloc needs to be freed with kvfree.
>

Yup, good catch.  Updated patch attached.

Alex
From 5c27c25ce79ac2b18a37bcd7dc6fa0bd3d8733d3 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu, 8 Aug 2019 00:29:23 -0500
Subject: [PATCH] drm/amd/display: use kvmalloc for dc_state (v2)

It's large and doesn't need contiguous memory.

v2: kvfree the memory.

Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 252b621d93a9..21fb7ee17c9c 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -23,6 +23,7 @@
  */
 
 #include <linux/slab.h>
+#include <linux/mm.h>
 
 #include "dm_services.h"
 
@@ -1183,8 +1184,8 @@ bool dc_post_update_surfaces_to_stream(struct dc *dc)
 
 struct dc_state *dc_create_state(struct dc *dc)
 {
-	struct dc_state *context = kzalloc(sizeof(struct dc_state),
-					   GFP_KERNEL);
+	struct dc_state *context = kvzalloc(sizeof(struct dc_state),
+					    GFP_KERNEL);
 
 	if (!context)
 		return NULL;
@@ -1204,11 +1205,11 @@ struct dc_state *dc_create_state(struct dc *dc)
 struct dc_state *dc_copy_state(struct dc_state *src_ctx)
 {
 	int i, j;
-	struct dc_state *new_ctx = kmemdup(src_ctx,
-			sizeof(struct dc_state), GFP_KERNEL);
+	struct dc_state *new_ctx = kvmalloc(sizeof(struct dc_state), GFP_KERNEL);
 
 	if (!new_ctx)
 		return NULL;
+	memcpy(new_ctx, src_ctx, sizeof(struct dc_state));
 
 	for (i = 0; i < MAX_PIPES; i++) {
 			struct pipe_ctx *cur_pipe = &new_ctx->res_ctx.pipe_ctx[i];
@@ -1242,7 +1243,7 @@ static void dc_state_free(struct kref *kref)
 {
 	struct dc_state *context = container_of(kref, struct dc_state, refcount);
 	dc_resource_state_destruct(context);
-	kfree(context);
+	kvfree(context);
 }
 
 void dc_release_state(struct dc_state *context)
-- 
2.20.1