Commit e116fd5c authored by Michal Wajdeczko's avatar Michal Wajdeczko
Browse files

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: default avatarMichal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: default avatarMatthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260127193727.601-6-michal.wajdeczko@intel.com
parent 09b45fd9

drivers/gpu/drm/xe/xe_guc.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

	}