[Intel-xe] [PATCH] drm/xe/guc_pc: Reorder forcewake and xe_pm_runtime calls

[Riana Tauro]

When the device is runtime suspended, reading some of the sysfs
entries under device/gt#/ causes a resume error
This is due to the ordering of pm_runtime and forcewake calls.
Reorder to wake up using xe_pm_runtime_get and then forcewake

Signed-off-by: Riana Tauro <riana.tauro at intel.com>
---
 drivers/gpu/drm/xe/xe_guc_pc.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_pc.c b/drivers/gpu/drm/xe/xe_guc_pc.c
index 5a8d827ba770..f71f6b3df38a 100644
--- a/drivers/gpu/drm/xe/xe_guc_pc.c
+++ b/drivers/gpu/drm/xe/xe_guc_pc.c
@@ -370,6 +370,7 @@ static ssize_t freq_act_show(struct device *dev,
 	u32 freq;
 	ssize_t ret;
 
+	xe_device_mem_access_get(gt_to_xe(gt));
 	/*
 	 * When in RC6, actual frequency is 0. Let's block RC6 so we are able
 	 * to verify that our freq requests are really happening.
@@ -378,8 +379,6 @@ static ssize_t freq_act_show(struct device *dev,
 	if (ret)
 		return ret;
 
-	xe_device_mem_access_get(gt_to_xe(gt));
-
 	if (xe->info.platform == XE_METEORLAKE) {
 		freq = xe_mmio_read32(gt, MTL_MIRROR_TARGET_WP1.reg);
 		freq = REG_FIELD_GET(MTL_CAGF_MASK, freq);
@@ -388,11 +387,10 @@ static ssize_t freq_act_show(struct device *dev,
 		freq = REG_FIELD_GET(GEN12_CAGF_MASK, freq);
 	}
 
-	xe_device_mem_access_put(gt_to_xe(gt));
-
 	ret = sysfs_emit(buf, "%d\n", decode_freq(freq));
 
 	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_device_mem_access_put(gt_to_xe(gt));
 	return ret;
 }
 static DEVICE_ATTR_RO(freq_act);
@@ -405,6 +403,7 @@ static ssize_t freq_cur_show(struct device *dev,
 	u32 freq;
 	ssize_t ret;
 
+	xe_device_mem_access_get(gt_to_xe(gt));
 	/*
 	 * GuC SLPC plays with cur freq request when GuCRC is enabled
 	 * Block RC6 for a more reliable read.
@@ -413,14 +412,13 @@ static ssize_t freq_cur_show(struct device *dev,
 	if (ret)
 		return ret;
 
-	xe_device_mem_access_get(gt_to_xe(gt));
 	freq = xe_mmio_read32(gt, GEN6_RPNSWREQ.reg);
-	xe_device_mem_access_put(gt_to_xe(gt));
 
 	freq = REG_FIELD_GET(REQ_RATIO_MASK, freq);
 	ret = sysfs_emit(buf, "%d\n", decode_freq(freq));
 
 	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_device_mem_access_put(gt_to_xe(gt));
 	return ret;
 }
 static DEVICE_ATTR_RO(freq_cur);
@@ -610,17 +608,16 @@ static ssize_t rc6_residency_show(struct device *dev,
 	u32 reg;
 	ssize_t ret;
 
+	xe_device_mem_access_get(pc_to_xe(pc));
 	ret = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
 	if (ret)
 		return ret;
 
-	xe_device_mem_access_get(pc_to_xe(pc));
 	reg = xe_mmio_read32(gt, GEN6_GT_GFX_RC6.reg);
-	xe_device_mem_access_put(pc_to_xe(pc));
-
 	ret = sysfs_emit(buff, "%u\n", reg);
 
 	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_device_mem_access_put(pc_to_xe(pc));
 	return ret;
 }
 static DEVICE_ATTR_RO(rc6_residency);
-- 
2.40.0