1 files changed, 283 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_sriov_pf.c b/drivers/gpu/drm/xe/xe_sriov_pf.c
new file mode 100644
index 000000000000..7c779d63179f
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_sriov_pf.c
@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023-2024 Intel Corporation
+ */
+
+#include <linux/debugfs.h>
+#include <drm/drm_debugfs.h>
+#include <drm/drm_managed.h>
+
+#include "xe_assert.h"
+#include "xe_configfs.h"
+#include "xe_device.h"
+#include "xe_gt_sriov_pf.h"
+#include "xe_module.h"
+#include "xe_sriov.h"
+#include "xe_sriov_pf.h"
+#include "xe_sriov_pf_helpers.h"
+#include "xe_sriov_pf_migration.h"
+#include "xe_sriov_pf_service.h"
+#include "xe_sriov_pf_sysfs.h"
+#include "xe_sriov_printk.h"
+
+static unsigned int wanted_max_vfs(struct xe_device *xe)
+{
+	if (IS_ENABLED(CONFIG_CONFIGFS_FS))
+		return xe_configfs_get_max_vfs(to_pci_dev(xe->drm.dev));
+	return xe_modparam.max_vfs;
+}
+
+static int pf_reduce_totalvfs(struct xe_device *xe, int limit)
+{
+	struct device *dev = xe->drm.dev;
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int err;
+
+	err = pci_sriov_set_totalvfs(pdev, limit);
+	if (err)
+		xe_sriov_notice(xe, "Failed to set number of VFs to %d (%pe)\n",
+				limit, ERR_PTR(err));
+	return err;
+}
+
+static bool pf_continue_as_native(struct xe_device *xe, const char *why)
+{
+	xe_sriov_dbg(xe, "%s, continuing as native\n", why);
+	pf_reduce_totalvfs(xe, 0);
+	return false;
+}
+
+/**
+ * xe_sriov_pf_readiness - Check if PF functionality can be enabled.
+ * @xe: the &xe_device to check
+ *
+ * This function is called as part of the SR-IOV probe to validate if all
+ * PF prerequisites are satisfied and we can continue with enabling PF mode.
+ *
+ * Return: true if the PF mode can be turned on.
+ */
+bool xe_sriov_pf_readiness(struct xe_device *xe)
+{
+	struct device *dev = xe->drm.dev;
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int totalvfs = pci_sriov_get_totalvfs(pdev);
+	int newlimit = min_t(u16, wanted_max_vfs(xe), totalvfs);
+
+	xe_assert(xe, totalvfs <= U16_MAX);
+
+	if (!dev_is_pf(dev))
+		return false;
+
+	if (!xe_device_uc_enabled(xe))
+		return pf_continue_as_native(xe, "Guc submission disabled");
+
+	if (!newlimit)
+		return pf_continue_as_native(xe, "all VFs disabled");
+
+	pf_reduce_totalvfs(xe, newlimit);
+
+	xe->sriov.pf.device_total_vfs = totalvfs;
+	xe->sriov.pf.driver_max_vfs = newlimit;
+
+	return true;
+}
+
+/**
+ * xe_sriov_pf_init_early - Initialize SR-IOV PF specific data.
+ * @xe: the &xe_device to initialize
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_pf_init_early(struct xe_device *xe)
+{
+	int err;
+
+	xe_assert(xe, IS_SRIOV_PF(xe));
+
+	xe->sriov.pf.vfs = drmm_kcalloc(&xe->drm, 1 + xe_sriov_pf_get_totalvfs(xe),
+					sizeof(*xe->sriov.pf.vfs), GFP_KERNEL);
+	if (!xe->sriov.pf.vfs)
+		return -ENOMEM;
+
+	err = drmm_mutex_init(&xe->drm, &xe->sriov.pf.master_lock);
+	if (err)
+		return err;
+
+	err = xe_sriov_pf_migration_init(xe);
+	if (err)
+		return err;
+
+	xe_guard_init(&xe->sriov.pf.guard_vfs_enabling, "vfs_enabling");
+
+	xe_sriov_pf_service_init(xe);
+
+	return 0;
+}
+
+/**
+ * xe_sriov_pf_init_late() - Late initialization of the SR-IOV PF.
+ * @xe: the &xe_device to initialize
+ *
+ * This function can only be called on PF.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_pf_init_late(struct xe_device *xe)
+{
+	struct xe_gt *gt;
+	unsigned int id;
+	int err;
+
+	xe_assert(xe, IS_SRIOV_PF(xe));
+
+	for_each_gt(gt, xe, id) {
+		err = xe_gt_sriov_pf_init(gt);
+		if (err)
+			return err;
+	}
+
+	err = xe_sriov_pf_sysfs_init(xe);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+/**
+ * xe_sriov_pf_wait_ready() - Wait until PF is ready to operate.
+ * @xe: the &xe_device to test
+ *
+ * This function can only be called on PF.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_pf_wait_ready(struct xe_device *xe)
+{
+	struct xe_gt *gt;
+	unsigned int id;
+	int err;
+
+	if (xe_device_wedged(xe))
+		return -ECANCELED;
+
+	for_each_gt(gt, xe, id) {
+		err = xe_gt_sriov_pf_wait_ready(gt);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+/**
+ * xe_sriov_pf_arm_guard() - Arm the guard for exclusive/lockdown mode.
+ * @xe: the PF &xe_device
+ * @guard: the &xe_guard to arm
+ * @lockdown: arm for lockdown(true) or exclusive(false) mode
+ * @who: the address of the new owner, or NULL if it's a caller
+ *
+ * This function can only be called on PF.
+ *
+ * It is a simple wrapper for xe_guard_arm() with additional debug
+ * messages.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_pf_arm_guard(struct xe_device *xe, struct xe_guard *guard,
+			  bool lockdown, void *who)
+{
+	void *new_owner = who ?: __builtin_return_address(0);
+	int err;
+
+	err = xe_guard_arm(guard, lockdown, new_owner);
+	if (err) {
+		xe_sriov_dbg(xe, "%s/%s mode denied (%pe) last owner %ps\n",
+			     guard->name, xe_guard_mode_str(lockdown),
+			     ERR_PTR(err), guard->owner);
+		return err;
+	}
+
+	xe_sriov_dbg_verbose(xe, "%s/%s by %ps\n",
+			     guard->name, xe_guard_mode_str(lockdown),
+			     new_owner);
+	return 0;
+}
+
+/**
+ * xe_sriov_pf_disarm_guard() - Disarm the guard.
+ * @xe: the PF &xe_device
+ * @guard: the &xe_guard to disarm
+ * @lockdown: disarm from lockdown(true) or exclusive(false) mode
+ * @who: the address of the indirect owner, or NULL if it's a caller
+ *
+ * This function can only be called on PF.
+ *
+ * It is a simple wrapper for xe_guard_disarm() with additional debug
+ * messages and xe_assert() to easily catch any illegal calls.
+ */
+void xe_sriov_pf_disarm_guard(struct xe_device *xe, struct xe_guard *guard,
+			      bool lockdown, void *who)
+{
+	bool disarmed;
+
+	xe_sriov_dbg_verbose(xe, "%s/%s by %ps\n",
+			     guard->name, xe_guard_mode_str(lockdown),
+			     who ?: __builtin_return_address(0));
+
+	disarmed = xe_guard_disarm(guard, lockdown);
+	xe_assert_msg(xe, disarmed, "%s/%s not armed? last owner %ps",
+		      guard->name, xe_guard_mode_str(lockdown), guard->owner);
+}
+
+/**
+ * xe_sriov_pf_lockdown() - Lockdown the PF to prevent VFs enabling.
+ * @xe: the PF &xe_device
+ *
+ * This function can only be called on PF.
+ *
+ * Once the PF is locked down, it will not enable VFs.
+ * If VFs are already enabled, the -EBUSY will be returned.
+ * To allow the PF enable VFs again call xe_sriov_pf_end_lockdown().
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_pf_lockdown(struct xe_device *xe)
+{
+	xe_assert(xe, IS_SRIOV_PF(xe));
+
+	return xe_sriov_pf_arm_guard(xe, &xe->sriov.pf.guard_vfs_enabling, true,
+				     __builtin_return_address(0));
+}
+
+/**
+ * xe_sriov_pf_end_lockdown() - Allow the PF to enable VFs again.
+ * @xe: the PF &xe_device
+ *
+ * This function can only be called on PF.
+ * See xe_sriov_pf_lockdown() for details.
+ */
+void xe_sriov_pf_end_lockdown(struct xe_device *xe)
+{
+	xe_assert(xe, IS_SRIOV_PF(xe));
+
+	xe_sriov_pf_disarm_guard(xe, &xe->sriov.pf.guard_vfs_enabling, true,
+				 __builtin_return_address(0));
+}
+
+/**
+ * xe_sriov_pf_print_vfs_summary - Print SR-IOV PF information.
+ * @xe: the &xe_device to print info from
+ * @p: the &drm_printer
+ *
+ * Print SR-IOV PF related information into provided DRM printer.
+ */
+void xe_sriov_pf_print_vfs_summary(struct xe_device *xe, struct drm_printer *p)
+{
+	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+
+	xe_assert(xe, IS_SRIOV_PF(xe));
+
+	drm_printf(p, "total: %u\n", xe->sriov.pf.device_total_vfs);
+	drm_printf(p, "supported: %u\n", xe->sriov.pf.driver_max_vfs);
+	drm_printf(p, "enabled: %u\n", pci_num_vf(pdev));
+}