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// SPDX-License-Identifier: MIT
/*
* Copyright © 2026 Intel Corporation
*/
#include <linux/bitmap.h>
#include <drm/drm_managed.h>
#include <drm/drm_print.h>
#include <drm/drm_ras.h>
#include "xe_device_types.h"
#include "xe_drm_ras.h"
static const char * const error_components[] = DRM_XE_RAS_ERROR_COMPONENT_NAMES;
static const char * const error_severity[] = DRM_XE_RAS_ERROR_SEVERITY_NAMES;
static int hw_query_error_counter(struct xe_drm_ras_counter *info,
u32 error_id, const char **name, u32 *val)
{
if (!info || !info[error_id].name)
return -ENOENT;
*name = info[error_id].name;
*val = atomic_read(&info[error_id].counter);
return 0;
}
static int query_uncorrectable_error_counter(struct drm_ras_node *ep, u32 error_id,
const char **name, u32 *val)
{
struct xe_device *xe = ep->priv;
struct xe_drm_ras *ras = &xe->ras;
struct xe_drm_ras_counter *info = ras->info[DRM_XE_RAS_ERR_SEV_UNCORRECTABLE];
return hw_query_error_counter(info, error_id, name, val);
}
static int query_correctable_error_counter(struct drm_ras_node *ep, u32 error_id,
const char **name, u32 *val)
{
struct xe_device *xe = ep->priv;
struct xe_drm_ras *ras = &xe->ras;
struct xe_drm_ras_counter *info = ras->info[DRM_XE_RAS_ERR_SEV_CORRECTABLE];
return hw_query_error_counter(info, error_id, name, val);
}
static struct xe_drm_ras_counter *allocate_and_copy_counters(struct xe_device *xe)
{
struct xe_drm_ras_counter *counter;
int i;
counter = kcalloc(DRM_XE_RAS_ERR_COMP_MAX, sizeof(*counter), GFP_KERNEL);
if (!counter)
return ERR_PTR(-ENOMEM);
for (i = DRM_XE_RAS_ERR_COMP_CORE_COMPUTE; i < DRM_XE_RAS_ERR_COMP_MAX; i++) {
if (!error_components[i])
continue;
counter[i].name = error_components[i];
atomic_set(&counter[i].counter, 0);
}
return counter;
}
static int assign_node_params(struct xe_device *xe, struct drm_ras_node *node,
const enum drm_xe_ras_error_severity severity)
{
struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
struct xe_drm_ras *ras = &xe->ras;
const char *device_name;
device_name = kasprintf(GFP_KERNEL, "%04x:%02x:%02x.%d",
pci_domain_nr(pdev->bus), pdev->bus->number,
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
if (!device_name)
return -ENOMEM;
node->device_name = device_name;
node->node_name = error_severity[severity];
node->type = DRM_RAS_NODE_TYPE_ERROR_COUNTER;
node->error_counter_range.first = DRM_XE_RAS_ERR_COMP_CORE_COMPUTE;
node->error_counter_range.last = DRM_XE_RAS_ERR_COMP_MAX - 1;
node->priv = xe;
ras->info[severity] = allocate_and_copy_counters(xe);
if (IS_ERR(ras->info[severity]))
return PTR_ERR(ras->info[severity]);
if (severity == DRM_XE_RAS_ERR_SEV_CORRECTABLE)
node->query_error_counter = query_correctable_error_counter;
else
node->query_error_counter = query_uncorrectable_error_counter;
return 0;
}
static void cleanup_node_param(struct xe_drm_ras *ras, const enum drm_xe_ras_error_severity severity)
{
struct drm_ras_node *node = &ras->node[severity];
kfree(ras->info[severity]);
ras->info[severity] = NULL;
kfree(node->device_name);
node->device_name = NULL;
}
static int register_nodes(struct xe_device *xe)
{
struct xe_drm_ras *ras = &xe->ras;
int i;
for_each_error_severity(i) {
struct drm_ras_node *node = &ras->node[i];
int ret;
ret = assign_node_params(xe, node, i);
if (ret) {
cleanup_node_param(ras, i);
return ret;
}
ret = drm_ras_node_register(node);
if (ret) {
cleanup_node_param(ras, i);
return ret;
}
}
return 0;
}
static void xe_drm_ras_unregister_nodes(struct drm_device *device, void *arg)
{
struct xe_device *xe = arg;
struct xe_drm_ras *ras = &xe->ras;
int i;
for_each_error_severity(i) {
struct drm_ras_node *node = &ras->node[i];
drm_ras_node_unregister(node);
cleanup_node_param(ras, i);
}
}
/**
* xe_drm_ras_init() - Initialize DRM RAS
* @xe: xe device instance
*
* Allocate and register DRM RAS nodes per device
*
* Return: 0 on success, negative error code otherwise.
*/
int xe_drm_ras_init(struct xe_device *xe)
{
struct xe_drm_ras *ras = &xe->ras;
struct drm_ras_node *node;
int err;
node = drmm_kcalloc(&xe->drm, DRM_XE_RAS_ERR_SEV_MAX, sizeof(*node), GFP_KERNEL);
if (!node)
return -ENOMEM;
ras->node = node;
err = register_nodes(xe);
if (err) {
drm_err(&xe->drm, "Failed to register DRM RAS nodes (%pe)\n", ERR_PTR(err));
return err;
}
err = drmm_add_action_or_reset(&xe->drm, xe_drm_ras_unregister_nodes, xe);
if (err) {
drm_err(&xe->drm, "Failed to add action for Xe DRM RAS (%pe)\n", ERR_PTR(err));
return err;
}
return 0;
}
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