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drm/xe: Open-code GGTT MMIO access protection

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commit 01f2557aa6 upstream.

GGTT MMIO access is currently protected by hotplug (drm_dev_enter),
which works correctly when the driver loads successfully and is later
unbound or unloaded. However, if driver load fails, this protection is
insufficient because drm_dev_unplug() is never called.

Additionally, devm release functions cannot guarantee that all BOs with
GGTT mappings are destroyed before the GGTT MMIO region is removed, as
some BOs may be freed asynchronously by worker threads.

To address this, introduce an open-coded flag, protected by the GGTT
lock, that guards GGTT MMIO access. The flag is cleared during the
dev_fini_ggtt devm release function to ensure MMIO access is disabled
once teardown begins.

Cc: stable@vger.kernel.org
Fixes: 919bb54e98 ("drm/xe: Fix missing runtime outer protection for ggtt_remove_node")
Reviewed-by: Zhanjun Dong <zhanjun.dong@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260310225039.1320161-8-zhanjun.dong@intel.com
(cherry picked from commit 4f3a998a173b4325c2efd90bdadc6ccd3ad9a431)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthew Brost
2026-03-10 18:50:39 -04:00
committed by Greg Kroah-Hartman
parent 91edd662f4
commit e2b424aade
2 changed files with 8 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/xe/xe_ggtt.c
View File

@@ -202,6 +202,8 @@ static void dev_fini_ggtt(void *arg)
{
struct xe_ggtt *ggtt = arg;
scoped_guard(mutex, &ggtt->lock)
ggtt->flags &= ~XE_GGTT_FLAGS_ONLINE;
drain_workqueue(ggtt->wq);
}
@@ -261,6 +263,7 @@ int xe_ggtt_init_early(struct xe_ggtt *ggtt)
if (err)
return err;
ggtt->flags |= XE_GGTT_FLAGS_ONLINE;
err = devm_add_action_or_reset(xe->drm.dev, dev_fini_ggtt, ggtt);
if (err)
return err;
@@ -293,13 +296,10 @@ static void xe_ggtt_initial_clear(struct xe_ggtt *ggtt)
static void ggtt_node_remove(struct xe_ggtt_node *node)
{
struct xe_ggtt *ggtt = node->ggtt;
struct xe_device *xe = tile_to_xe(ggtt->tile);
bool bound;
int idx;
bound = drm_dev_enter(&xe->drm, &idx);
mutex_lock(&ggtt->lock);
bound = ggtt->flags & XE_GGTT_FLAGS_ONLINE;
if (bound)
xe_ggtt_clear(ggtt, node->base.start, node->base.size);
drm_mm_remove_node(&node->base);
@@ -312,8 +312,6 @@ static void ggtt_node_remove(struct xe_ggtt_node *node)
if (node->invalidate_on_remove)
xe_ggtt_invalidate(ggtt);
drm_dev_exit(idx);
free_node:
xe_ggtt_node_fini(node);
}

5
drivers/gpu/drm/xe/xe_ggtt_types.h
View File

@@ -25,11 +25,14 @@ struct xe_ggtt {
/** @size: Total size of this GGTT */
u64 size;
#define XE_GGTT_FLAGS_64K BIT(0)
#define XE_GGTT_FLAGS_64K BIT(0)
#define XE_GGTT_FLAGS_ONLINE BIT(1)
/**
* @flags: Flags for this GGTT
* Acceptable flags:
* - %XE_GGTT_FLAGS_64K - if PTE size is 64K. Otherwise, regular is 4K.
* - %XE_GGTT_FLAGS_ONLINE - is GGTT online, protected by ggtt->lock
* after init
*/
unsigned int flags;
/** @scratch: Internal object allocation used as a scratch page */