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// 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_device.h"
#include "xe_module.h"
#include "xe_sriov.h"
#include "xe_sriov_pf.h"
#include "xe_sriov_pf_helpers.h"
#include "xe_sriov_pf_service.h"
#include "xe_sriov_printk.h"
static unsigned int wanted_max_vfs(struct xe_device *xe)
{
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;
xe_sriov_pf_service_init(xe);
return 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));
}
static int simple_show(struct seq_file *m, void *data)
{
struct drm_printer p = drm_seq_file_printer(m);
struct drm_info_node *node = m->private;
struct dentry *parent = node->dent->d_parent;
struct xe_device *xe = parent->d_inode->i_private;
void (*print)(struct xe_device *, struct drm_printer *) = node->info_ent->data;
print(xe, &p);
return 0;
}
static const struct drm_info_list debugfs_list[] = {
{ .name = "vfs", .show = simple_show, .data = xe_sriov_pf_print_vfs_summary },
{ .name = "versions", .show = simple_show, .data = xe_sriov_pf_service_print_versions },
};
/**
* xe_sriov_pf_debugfs_register - Register PF debugfs attributes.
* @xe: the &xe_device
* @root: the root &dentry
*
* Prepare debugfs attributes exposed by the PF.
*/
void xe_sriov_pf_debugfs_register(struct xe_device *xe, struct dentry *root)
{
struct drm_minor *minor = xe->drm.primary;
struct dentry *parent;
/*
* /sys/kernel/debug/dri/0/
* ├── pf
* │ ├── ...
*/
parent = debugfs_create_dir("pf", root);
if (IS_ERR(parent))
return;
parent->d_inode->i_private = xe;
drm_debugfs_create_files(debugfs_list, ARRAY_SIZE(debugfs_list), parent, minor);
}
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