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drm/xe/guc: Wait before retrying sending H2G

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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
This commit is contained in:
Michal Wajdeczko 2026-01-27 20:37:25 +01:00
parent 09b45fd9d3
commit e116fd5c60
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/xe/xe_guc.c
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@ -40,6 +40,7 @@
#include "xe_memirq.h"
#include "xe_mmio.h"
#include "xe_platform_types.h"
#include "xe_sleep.h"
#include "xe_sriov.h"
#include "xe_sriov_pf_migration.h"
#include "xe_uc.h"
@ -1408,6 +1409,7 @@ int xe_guc_mmio_send_recv(struct xe_guc *guc, const u32 *request,
struct xe_reg reply_reg = xe_gt_is_media_type(gt) ?
MED_VF_SW_FLAG(0) : VF_SW_FLAG(0);
const u32 LAST_INDEX = VF_SW_FLAG_COUNT - 1;
unsigned int sleep_period_ms = 1;
bool lost = false;
u32 header;
int ret;
@ -1490,6 +1492,8 @@ int xe_guc_mmio_send_recv(struct xe_guc *guc, const u32 *request,
xe_gt_dbg(gt, "GuC mmio request %#x: retrying, reason %#x\n",
request[0], reason);
xe_sleep_exponential_ms(&sleep_period_ms, 256);
goto retry;
}