[Intel-xe] [PATCH 11/11] drm/xe: Clear all SoC errors post warm reset.

[Himal Prasad Ghimiray]

There are scenarios where there are no fatal errors reported
but Non-fatal/correctable errors being reported from the SoC
uncore to IEH and not propogated to SG unit. Clear all previous
SoC errors post warm reset.

Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
 drivers/gpu/drm/xe/xe_hw_error.c | 37 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_hw_error.h |  1 +
 drivers/gpu/drm/xe/xe_irq.c      |  1 +
 3 files changed, 39 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_hw_error.c b/drivers/gpu/drm/xe/xe_hw_error.c
index 0bcb1bea7ffb..a777c887a7be 100644
--- a/drivers/gpu/drm/xe/xe_hw_error.c
+++ b/drivers/gpu/drm/xe/xe_hw_error.c
@@ -366,6 +366,43 @@ static void xe_assign_hw_err_regs(struct xe_device *xe)
 	}
 }
 
+void xe_clear_all_soc_errors(struct xe_device *xe)
+{
+	enum hardware_error hw_err;
+	u32 base, slave_base;
+	struct xe_tile *tile;
+	struct xe_gt *gt;
+	unsigned int i;
+
+	base = SOC_PVC_BASE;
+	slave_base = SOC_PVC_SLAVE_BASE;
+
+	hw_err = HARDWARE_ERROR_CORRECTABLE;
+
+	for_each_tile(tile, xe, i) {
+		gt = tile->primary_gt;
+
+		while (hw_err < HARDWARE_ERROR_MAX) {
+			for (i = 0; i < PVC_NUM_IEH; i++)
+				xe_mmio_write32(gt, SOC_GSYSEVTCTL_REG(base, slave_base, i),
+						~REG_BIT(hw_err));
+
+			xe_mmio_write32(gt, SOC_GLOBAL_ERR_STAT_MASTER_REG(base, hw_err),
+					REG_GENMASK(31, 0));
+			xe_mmio_write32(gt, SOC_LOCAL_ERR_STAT_MASTER_REG(base, hw_err),
+					REG_GENMASK(31, 0));
+			xe_mmio_write32(gt, SOC_GLOBAL_ERR_STAT_SLAVE_REG(slave_base, hw_err),
+					REG_GENMASK(31, 0));
+			xe_mmio_write32(gt, SOC_LOCAL_ERR_STAT_SLAVE_REG(slave_base, hw_err),
+					REG_GENMASK(31, 0));
+			hw_err++;
+		}
+		for (i = 0; i < PVC_NUM_IEH; i++)
+			xe_mmio_write32(gt, SOC_GSYSEVTCTL_REG(base, slave_base, i),
+					(HARDWARE_ERROR_MAX << 1) + 1);
+	}
+}
+
 static void
 xe_gt_hw_error_status_reg_handler(struct xe_gt *gt, const enum hardware_error hw_err)
 {
diff --git a/drivers/gpu/drm/xe/xe_hw_error.h b/drivers/gpu/drm/xe/xe_hw_error.h
index a458a90b34a2..7ada7c97c939 100644
--- a/drivers/gpu/drm/xe/xe_hw_error.h
+++ b/drivers/gpu/drm/xe/xe_hw_error.h
@@ -219,4 +219,5 @@ struct xe_tile;
 void xe_hw_error_irq_handler(struct xe_tile *tile, const u32 master_ctl);
 void xe_process_hw_errors(struct xe_device *xe);
 void xe_gsc_hw_error_work(struct work_struct *work);
+void xe_clear_all_soc_errors(struct xe_device *xe);
 #endif
diff --git a/drivers/gpu/drm/xe/xe_irq.c b/drivers/gpu/drm/xe/xe_irq.c
index 285c657cc789..42a6bb45acba 100644
--- a/drivers/gpu/drm/xe/xe_irq.c
+++ b/drivers/gpu/drm/xe/xe_irq.c
@@ -597,6 +597,7 @@ int xe_irq_install(struct xe_device *xe)
 	}
 
 	xe_process_hw_errors(xe);
+	xe_clear_all_soc_errors(xe);
 
 	xe->irq.enabled = true;
 
-- 
2.25.1