drm/xe/gt: Update handling of xe_force_wake_get return

xe_force_wake_get() now returns the reference count-incremented domain
mask. If it fails for individual domains, the return value will always
be 0. However, for XE_FORCEWAKE_ALL, it may return a non-zero value even
in the event of failure. Use helper xe_force_wake_ref_has_domain to verify
all domains are initialized or not. Update the return handling of
xe_force_wake_get() to reflect this behavior, and ensure that the return
value is passed as input to xe_force_wake_put().

v3
- return xe_wakeref_t instead of int in xe_force_wake_get()
- xe_force_wake_put() error doesn't need to be checked. It internally
WARNS on domain ack failure.

v4
- Rebase fix

v5
- return unsigned int for xe_force_wake_get()
- remove redundant XE_WARN_ON()

v6
- use helper for checking all initialized domains are awake or not.

v7
- Fix commit message

v9
- Remove redundant WARN_ON (Badal)

Cc: Badal Nilawar <badal.nilawar@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Badal Nilawar <badal.nilawar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241014075601.2324382-10-himal.prasad.ghimiray@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 58 insertions, 47 deletions

diff --git a/drivers/gpu/drm/xe/xe_gt.c b/drivers/gpu/drm/xe/xe_gt.c
index df2fe4005d85..89e9d9d4db06 100644
--- a/drivers/gpu/drm/xe/xe_gt.c
+++ b/drivers/gpu/drm/xe/xe_gt.c
@@ -97,14 +97,14 @@ void xe_gt_sanitize(struct xe_gt *gt)
 
 static void xe_gt_enable_host_l2_vram(struct xe_gt *gt)
 {
+	unsigned int fw_ref;
 	u32 reg;
-	int err;
 
 	if (!XE_WA(gt, 16023588340))
 		return;
 
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
-	if (WARN_ON(err))
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+	if (!fw_ref)
 		return;
 
 	if (!xe_gt_is_media_type(gt)) {
@@ -114,13 +114,13 @@ static void xe_gt_enable_host_l2_vram(struct xe_gt *gt)
 	}
 
 	xe_gt_mcr_multicast_write(gt, XEHPC_L3CLOS_MASK(3), 0x3);
-	xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 }
 
 static void xe_gt_disable_host_l2_vram(struct xe_gt *gt)
 {
+	unsigned int fw_ref;
 	u32 reg;
-	int err;
 
 	if (!XE_WA(gt, 16023588340))
 		return;
@@ -128,15 +128,15 @@ static void xe_gt_disable_host_l2_vram(struct xe_gt *gt)
 	if (xe_gt_is_media_type(gt))
 		return;
 
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
-	if (WARN_ON(err))
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+	if (!fw_ref)
 		return;
 
 	reg = xe_gt_mcr_unicast_read_any(gt, XE2_GAMREQSTRM_CTRL);
 	reg &= ~CG_DIS_CNTLBUS;
 	xe_gt_mcr_multicast_write(gt, XE2_GAMREQSTRM_CTRL, reg);
 
-	xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 }
 
 /**
@@ -402,11 +402,14 @@ static void dump_pat_on_error(struct xe_gt *gt)
 
 static int gt_fw_domain_init(struct xe_gt *gt)
 {
+	unsigned int fw_ref;
 	int err, i;
 
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
-	if (err)
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+	if (!fw_ref) {
+		err = -ETIMEDOUT;
 		goto err_hw_fence_irq;
+	}
 
 	if (!xe_gt_is_media_type(gt)) {
 		err = xe_ggtt_init(gt_to_tile(gt)->mem.ggtt);
@@ -441,14 +444,12 @@ static int gt_fw_domain_init(struct xe_gt *gt)
 	 */
 	gt->info.gmdid = xe_mmio_read32(&gt->mmio, GMD_ID);
 
-	err = xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
-	XE_WARN_ON(err);
-
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	return 0;
 
 err_force_wake:
 	dump_pat_on_error(gt);
-	xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 err_hw_fence_irq:
 	for (i = 0; i < XE_ENGINE_CLASS_MAX; ++i)
 		xe_hw_fence_irq_finish(&gt->fence_irq[i]);
@@ -458,11 +459,14 @@ err_hw_fence_irq:
 
 static int all_fw_domain_init(struct xe_gt *gt)
 {
+	unsigned int fw_ref;
 	int err, i;
 
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
-	if (err)
-		goto err_hw_fence_irq;
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+	if (!xe_force_wake_ref_has_domain(fw_ref, XE_FORCEWAKE_ALL)) {
+		err = -ETIMEDOUT;
+		goto err_force_wake;
+	}
 
 	xe_gt_mcr_set_implicit_defaults(gt);
 	xe_reg_sr_apply_mmio(&gt->reg_sr, gt);
@@ -526,14 +530,12 @@ static int all_fw_domain_init(struct xe_gt *gt)
 	if (IS_SRIOV_PF(gt_to_xe(gt)))
 		xe_gt_sriov_pf_init_hw(gt);
 
-	err = xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL);
-	XE_WARN_ON(err);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 
 	return 0;
 
 err_force_wake:
-	xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL);
-err_hw_fence_irq:
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	for (i = 0; i < XE_ENGINE_CLASS_MAX; ++i)
 		xe_hw_fence_irq_finish(&gt->fence_irq[i]);
 
@@ -546,11 +548,12 @@ err_hw_fence_irq:
  */
 int xe_gt_init_hwconfig(struct xe_gt *gt)
 {
+	unsigned int fw_ref;
 	int err;
 
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
-	if (err)
-		goto out;
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+	if (!fw_ref)
+		return -ETIMEDOUT;
 
 	xe_gt_mcr_init_early(gt);
 	xe_pat_init(gt);
@@ -568,8 +571,7 @@ int xe_gt_init_hwconfig(struct xe_gt *gt)
 	xe_gt_enable_host_l2_vram(gt);
 
 out_fw:
-	xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
-out:
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	return err;
 }
 
@@ -764,6 +766,7 @@ static int do_gt_restart(struct xe_gt *gt)
 
 static int gt_reset(struct xe_gt *gt)
 {
+	unsigned int fw_ref;
 	int err;
 
 	if (xe_device_wedged(gt_to_xe(gt)))
@@ -784,9 +787,11 @@ static int gt_reset(struct xe_gt *gt)
 
 	xe_gt_sanitize(gt);
 
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
-	if (err)
-		goto err_msg;
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+	if (!xe_force_wake_ref_has_domain(fw_ref, XE_FORCEWAKE_ALL)) {
+		err = -ETIMEDOUT;
+		goto err_out;
+	}
 
 	xe_uc_gucrc_disable(&gt->uc);
 	xe_uc_stop_prepare(&gt->uc);
@@ -804,8 +809,7 @@ static int gt_reset(struct xe_gt *gt)
 	if (err)
 		goto err_out;
 
-	err = xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL);
-	XE_WARN_ON(err);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	xe_pm_runtime_put(gt_to_xe(gt));
 
 	xe_gt_info(gt, "reset done\n");
@@ -813,8 +817,7 @@ static int gt_reset(struct xe_gt *gt)
 	return 0;
 
 err_out:
-	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
-err_msg:
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	XE_WARN_ON(xe_uc_start(&gt->uc));
 err_fail:
 	xe_gt_err(gt, "reset failed (%pe)\n", ERR_PTR(err));
@@ -846,22 +849,25 @@ void xe_gt_reset_async(struct xe_gt *gt)
 
 void xe_gt_suspend_prepare(struct xe_gt *gt)
 {
-	XE_WARN_ON(xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	unsigned int fw_ref;
+
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
 
 	xe_uc_stop_prepare(&gt->uc);
 
-	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 }
 
 int xe_gt_suspend(struct xe_gt *gt)
 {
+	unsigned int fw_ref;
 	int err;
 
 	xe_gt_dbg(gt, "suspending\n");
 	xe_gt_sanitize(gt);
 
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
-	if (err)
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+	if (!xe_force_wake_ref_has_domain(fw_ref, XE_FORCEWAKE_ALL))
 		goto err_msg;
 
 	err = xe_uc_suspend(&gt->uc);
@@ -872,14 +878,15 @@ int xe_gt_suspend(struct xe_gt *gt)
 
 	xe_gt_disable_host_l2_vram(gt);
 
-	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	xe_gt_dbg(gt, "suspended\n");
 
 	return 0;
 
-err_force_wake:
-	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
 err_msg:
+	err = -ETIMEDOUT;
+err_force_wake:
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	xe_gt_err(gt, "suspend failed (%pe)\n", ERR_PTR(err));
 
 	return err;
@@ -887,9 +894,11 @@ err_msg:
 
 void xe_gt_shutdown(struct xe_gt *gt)
 {
-	xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+	unsigned int fw_ref;
+
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
 	do_gt_reset(gt);
-	xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 }
 
 /**
@@ -914,11 +923,12 @@ int xe_gt_sanitize_freq(struct xe_gt *gt)
 
 int xe_gt_resume(struct xe_gt *gt)
 {
+	unsigned int fw_ref;
 	int err;
 
 	xe_gt_dbg(gt, "resuming\n");
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
-	if (err)
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+	if (!xe_force_wake_ref_has_domain(fw_ref, XE_FORCEWAKE_ALL))
 		goto err_msg;
 
 	err = do_gt_restart(gt);
@@ -927,14 +937,15 @@ int xe_gt_resume(struct xe_gt *gt)
 
 	xe_gt_idle_enable_pg(gt);
 
-	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	xe_gt_dbg(gt, "resumed\n");
 
 	return 0;
 
-err_force_wake:
-	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
 err_msg:
+	err = -ETIMEDOUT;
+err_force_wake:
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	xe_gt_err(gt, "resume failed (%pe)\n", ERR_PTR(err));
 
 	return err;