[PATCH 15/20] drm/xe: Implement SR-IOV and eudebug exclusivity

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

From: Christoph Manszewski <christoph.manszewski@intel.com>

EU debug functionality relies on access to specific mmio registers.
Since VFs don't have access to those registers and in order to avoid
interference with VFs, make SR-IOV and eudebug functionality exclusive.
I.e. don't allow to enable eudebug in VF mode and don't allow to enable
eudebug when any VFs are provisioned. Likewise, don't allow to provision
VFs when eudebug is enabled.

Signed-off-by: Christoph Manszewski <christoph.manszewski@intel.com>
Signed-off-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
---
 drivers/gpu/drm/xe/tests/xe_eudebug.c | 10 ++++++++++
 drivers/gpu/drm/xe/xe_eudebug.c       | 23 +++++++++++++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/tests/xe_eudebug.c b/drivers/gpu/drm/xe/tests/xe_eudebug.c
index f839fb292b9b..601725c642bd 100644
--- a/drivers/gpu/drm/xe/tests/xe_eudebug.c
+++ b/drivers/gpu/drm/xe/tests/xe_eudebug.c
@@ -8,9 +8,13 @@
 #include "regs/xe_gt_regs.h"
 #include "regs/xe_engine_regs.h"
 
+#include "xe_device.h"
+#include "xe_eudebug.h"
 #include "xe_force_wake.h"
+#include "xe_gt.h"
 #include "xe_gt_mcr.h"
 #include "xe_mmio.h"
+#include "xe_pm.h"
 
 #include "tests/xe_kunit_helpers.h"
 #include "tests/xe_pci_test.h"
@@ -147,6 +151,12 @@ static int toggle_reg_value(struct xe_device *xe)
 	struct kunit *test = kunit_get_current_test();
 	bool enable_eudebug = xe_eudebug_is_enabled(xe);
 
+	if (IS_SRIOV_VF(xe))
+		kunit_skip(test, "eudebug not available in SR-IOV VF mode\n");
+
+	if (xe->eudebug.state == XE_EUDEBUG_NOT_SUPPORTED)
+		kunit_skip(test, "eudebug not supported\n");
+
 	kunit_printk(KERN_DEBUG, test, "Test eudebug WAs for graphics version: %u\n",
 		     GRAPHICS_VERx100(xe));
 
diff --git a/drivers/gpu/drm/xe/xe_eudebug.c b/drivers/gpu/drm/xe/xe_eudebug.c
index 1c1fa02d1bd7..44381084ee96 100644
--- a/drivers/gpu/drm/xe/xe_eudebug.c
+++ b/drivers/gpu/drm/xe/xe_eudebug.c
@@ -25,6 +25,7 @@
 #include "xe_gt_debug.h"
 #include "xe_macros.h"
 #include "xe_pm.h"
+#include "xe_sriov_pf.h"
 #include "xe_sync.h"
 #include "xe_vm.h"
 
@@ -1954,6 +1955,7 @@ bool xe_eudebug_is_enabled(struct xe_device *xe)
 int xe_eudebug_enable(struct xe_device *xe, bool enable)
 {
 	struct xe_gt *gt;
+	int ret;
 	int i;
 	u8 id;
 
@@ -1974,6 +1976,14 @@ int xe_eudebug_enable(struct xe_device *xe, bool enable)
 		return 0;
 	}
 
+	if (enable && IS_SRIOV_PF(xe)) {
+		ret = xe_sriov_pf_lockdown(xe);
+		if (ret) {
+			mutex_unlock(&xe->eudebug.lock);
+			return ret;
+		}
+	}
+
 	xe_pm_runtime_get(xe);
 
 	for_each_gt(gt, xe, id) {
@@ -1994,11 +2004,15 @@ int xe_eudebug_enable(struct xe_device *xe, bool enable)
 		XE_EUDEBUG_ENABLED : XE_EUDEBUG_DISABLED;
 	mutex_unlock(&xe->eudebug.lock);
 
-	if (enable)
+	if (enable) {
 		attention_poll_start(xe);
-	else
+	} else {
 		attention_poll_stop(xe);
 
+		if (IS_SRIOV_PF(xe))
+			xe_sriov_pf_end_lockdown(xe);
+	}
+
 	return 0;
 }
 
@@ -2060,6 +2074,11 @@ void xe_eudebug_init(struct xe_device *xe)
 
 	xe->eudebug.state = XE_EUDEBUG_NOT_SUPPORTED;
 
+	if (IS_SRIOV_VF(xe)) {
+		drm_info(&xe->drm, "eudebug not available in SR-IOV VF mode\n");
+		return;
+	}
+
 	err = drmm_mutex_init(dev, &xe->eudebug.lock);
 	if (err)
 		goto out_err;
-- 
2.43.0