Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
drm/xe/guc: Wait before retrying sending H2G
We shall resend H2G message after receiving NO_RESPONSE_RETRY reply,
but since GuC dropped that H2G due to some interim state, we should
give it a little time to stabilize. Wait before sending the same H2G
again, start with 1ms delay, then increase exponentially to 256ms.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260127193727.601-6-michal.wajdeczko@intel.com
+4
+4
drivers/gpu/drm/xe/xe_guc.c
+4
drivers/gpu/drm/xe/xe_guc.c
···
40
40
#include "xe_memirq.h"
41
41
#include "xe_mmio.h"
42
42
#include "xe_platform_types.h"
43
+
#include "xe_sleep.h"
43
44
#include "xe_sriov.h"
44
45
#include "xe_sriov_pf_migration.h"
45
46
#include "xe_uc.h"
···
1409
1408
struct xe_reg reply_reg = xe_gt_is_media_type(gt) ?
1410
1409
MED_VF_SW_FLAG(0) : VF_SW_FLAG(0);
1411
1410
const u32 LAST_INDEX = VF_SW_FLAG_COUNT - 1;
1411
+
unsigned int sleep_period_ms = 1;
1412
1412
bool lost = false;
1413
1413
u32 header;
1414
1414
int ret;
···
1492
1490
1493
1491
xe_gt_dbg(gt, "GuC mmio request %#x: retrying, reason %#x\n",
1494
1492
request[0], reason);
1493
+
1494
+
xe_sleep_exponential_ms(&sleep_period_ms, 256);
1495
1495
goto retry;
1496
1496
}
1497
1497