mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Qinglang Miao](/assets/img/avatar_default.png)
Simplify the return expression. Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Acked-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> Link: https://lore.kernel.org/r/20200921131047.92526-1-miaoqinglang@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
569 lines
12 KiB
C
569 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
// Copyright 2019 IBM Corp.
|
|
#include <linux/idr.h>
|
|
#include "ocxl_internal.h"
|
|
|
|
static struct ocxl_fn *ocxl_fn_get(struct ocxl_fn *fn)
|
|
{
|
|
return (get_device(&fn->dev) == NULL) ? NULL : fn;
|
|
}
|
|
|
|
static void ocxl_fn_put(struct ocxl_fn *fn)
|
|
{
|
|
put_device(&fn->dev);
|
|
}
|
|
|
|
static struct ocxl_afu *alloc_afu(struct ocxl_fn *fn)
|
|
{
|
|
struct ocxl_afu *afu;
|
|
|
|
afu = kzalloc(sizeof(struct ocxl_afu), GFP_KERNEL);
|
|
if (!afu)
|
|
return NULL;
|
|
|
|
kref_init(&afu->kref);
|
|
mutex_init(&afu->contexts_lock);
|
|
mutex_init(&afu->afu_control_lock);
|
|
idr_init(&afu->contexts_idr);
|
|
afu->fn = fn;
|
|
ocxl_fn_get(fn);
|
|
return afu;
|
|
}
|
|
|
|
static void free_afu(struct kref *kref)
|
|
{
|
|
struct ocxl_afu *afu = container_of(kref, struct ocxl_afu, kref);
|
|
|
|
idr_destroy(&afu->contexts_idr);
|
|
ocxl_fn_put(afu->fn);
|
|
kfree(afu);
|
|
}
|
|
|
|
void ocxl_afu_get(struct ocxl_afu *afu)
|
|
{
|
|
kref_get(&afu->kref);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_afu_get);
|
|
|
|
void ocxl_afu_put(struct ocxl_afu *afu)
|
|
{
|
|
kref_put(&afu->kref, free_afu);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_afu_put);
|
|
|
|
static int assign_afu_actag(struct ocxl_afu *afu)
|
|
{
|
|
struct ocxl_fn *fn = afu->fn;
|
|
int actag_count, actag_offset;
|
|
struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
|
|
|
|
/*
|
|
* if there were not enough actags for the function, each afu
|
|
* reduces its count as well
|
|
*/
|
|
actag_count = afu->config.actag_supported *
|
|
fn->actag_enabled / fn->actag_supported;
|
|
actag_offset = ocxl_actag_afu_alloc(fn, actag_count);
|
|
if (actag_offset < 0) {
|
|
dev_err(&pci_dev->dev, "Can't allocate %d actags for AFU: %d\n",
|
|
actag_count, actag_offset);
|
|
return actag_offset;
|
|
}
|
|
afu->actag_base = fn->actag_base + actag_offset;
|
|
afu->actag_enabled = actag_count;
|
|
|
|
ocxl_config_set_afu_actag(pci_dev, afu->config.dvsec_afu_control_pos,
|
|
afu->actag_base, afu->actag_enabled);
|
|
dev_dbg(&pci_dev->dev, "actag base=%d enabled=%d\n",
|
|
afu->actag_base, afu->actag_enabled);
|
|
return 0;
|
|
}
|
|
|
|
static void reclaim_afu_actag(struct ocxl_afu *afu)
|
|
{
|
|
struct ocxl_fn *fn = afu->fn;
|
|
int start_offset, size;
|
|
|
|
start_offset = afu->actag_base - fn->actag_base;
|
|
size = afu->actag_enabled;
|
|
ocxl_actag_afu_free(afu->fn, start_offset, size);
|
|
}
|
|
|
|
static int assign_afu_pasid(struct ocxl_afu *afu)
|
|
{
|
|
struct ocxl_fn *fn = afu->fn;
|
|
int pasid_count, pasid_offset;
|
|
struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
|
|
|
|
/*
|
|
* We only support the case where the function configuration
|
|
* requested enough PASIDs to cover all AFUs.
|
|
*/
|
|
pasid_count = 1 << afu->config.pasid_supported_log;
|
|
pasid_offset = ocxl_pasid_afu_alloc(fn, pasid_count);
|
|
if (pasid_offset < 0) {
|
|
dev_err(&pci_dev->dev, "Can't allocate %d PASIDs for AFU: %d\n",
|
|
pasid_count, pasid_offset);
|
|
return pasid_offset;
|
|
}
|
|
afu->pasid_base = fn->pasid_base + pasid_offset;
|
|
afu->pasid_count = 0;
|
|
afu->pasid_max = pasid_count;
|
|
|
|
ocxl_config_set_afu_pasid(pci_dev, afu->config.dvsec_afu_control_pos,
|
|
afu->pasid_base,
|
|
afu->config.pasid_supported_log);
|
|
dev_dbg(&pci_dev->dev, "PASID base=%d, enabled=%d\n",
|
|
afu->pasid_base, pasid_count);
|
|
return 0;
|
|
}
|
|
|
|
static void reclaim_afu_pasid(struct ocxl_afu *afu)
|
|
{
|
|
struct ocxl_fn *fn = afu->fn;
|
|
int start_offset, size;
|
|
|
|
start_offset = afu->pasid_base - fn->pasid_base;
|
|
size = 1 << afu->config.pasid_supported_log;
|
|
ocxl_pasid_afu_free(afu->fn, start_offset, size);
|
|
}
|
|
|
|
static int reserve_fn_bar(struct ocxl_fn *fn, int bar)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(fn->dev.parent);
|
|
int rc, idx;
|
|
|
|
if (bar != 0 && bar != 2 && bar != 4)
|
|
return -EINVAL;
|
|
|
|
idx = bar >> 1;
|
|
if (fn->bar_used[idx]++ == 0) {
|
|
rc = pci_request_region(dev, bar, "ocxl");
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void release_fn_bar(struct ocxl_fn *fn, int bar)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(fn->dev.parent);
|
|
int idx;
|
|
|
|
if (bar != 0 && bar != 2 && bar != 4)
|
|
return;
|
|
|
|
idx = bar >> 1;
|
|
if (--fn->bar_used[idx] == 0)
|
|
pci_release_region(dev, bar);
|
|
WARN_ON(fn->bar_used[idx] < 0);
|
|
}
|
|
|
|
static int map_mmio_areas(struct ocxl_afu *afu)
|
|
{
|
|
int rc;
|
|
struct pci_dev *pci_dev = to_pci_dev(afu->fn->dev.parent);
|
|
|
|
rc = reserve_fn_bar(afu->fn, afu->config.global_mmio_bar);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = reserve_fn_bar(afu->fn, afu->config.pp_mmio_bar);
|
|
if (rc) {
|
|
release_fn_bar(afu->fn, afu->config.global_mmio_bar);
|
|
return rc;
|
|
}
|
|
|
|
afu->global_mmio_start =
|
|
pci_resource_start(pci_dev, afu->config.global_mmio_bar) +
|
|
afu->config.global_mmio_offset;
|
|
afu->pp_mmio_start =
|
|
pci_resource_start(pci_dev, afu->config.pp_mmio_bar) +
|
|
afu->config.pp_mmio_offset;
|
|
|
|
afu->global_mmio_ptr = ioremap(afu->global_mmio_start,
|
|
afu->config.global_mmio_size);
|
|
if (!afu->global_mmio_ptr) {
|
|
release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
|
|
release_fn_bar(afu->fn, afu->config.global_mmio_bar);
|
|
dev_err(&pci_dev->dev, "Error mapping global mmio area\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Leave an empty page between the per-process mmio area and
|
|
* the AFU interrupt mappings
|
|
*/
|
|
afu->irq_base_offset = afu->config.pp_mmio_stride + PAGE_SIZE;
|
|
return 0;
|
|
}
|
|
|
|
static void unmap_mmio_areas(struct ocxl_afu *afu)
|
|
{
|
|
if (afu->global_mmio_ptr) {
|
|
iounmap(afu->global_mmio_ptr);
|
|
afu->global_mmio_ptr = NULL;
|
|
}
|
|
afu->global_mmio_start = 0;
|
|
afu->pp_mmio_start = 0;
|
|
release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
|
|
release_fn_bar(afu->fn, afu->config.global_mmio_bar);
|
|
}
|
|
|
|
static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
rc = ocxl_config_read_afu(dev, &afu->fn->config, &afu->config, afu_idx);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = assign_afu_actag(afu);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = assign_afu_pasid(afu);
|
|
if (rc)
|
|
goto err_free_actag;
|
|
|
|
rc = map_mmio_areas(afu);
|
|
if (rc)
|
|
goto err_free_pasid;
|
|
|
|
return 0;
|
|
|
|
err_free_pasid:
|
|
reclaim_afu_pasid(afu);
|
|
err_free_actag:
|
|
reclaim_afu_actag(afu);
|
|
return rc;
|
|
}
|
|
|
|
static void deconfigure_afu(struct ocxl_afu *afu)
|
|
{
|
|
unmap_mmio_areas(afu);
|
|
reclaim_afu_pasid(afu);
|
|
reclaim_afu_actag(afu);
|
|
}
|
|
|
|
static int activate_afu(struct pci_dev *dev, struct ocxl_afu *afu)
|
|
{
|
|
ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void deactivate_afu(struct ocxl_afu *afu)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
|
|
|
|
ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 0);
|
|
}
|
|
|
|
static int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx)
|
|
{
|
|
int rc;
|
|
struct ocxl_afu *afu;
|
|
|
|
afu = alloc_afu(fn);
|
|
if (!afu)
|
|
return -ENOMEM;
|
|
|
|
rc = configure_afu(afu, afu_idx, dev);
|
|
if (rc) {
|
|
ocxl_afu_put(afu);
|
|
return rc;
|
|
}
|
|
|
|
rc = activate_afu(dev, afu);
|
|
if (rc) {
|
|
deconfigure_afu(afu);
|
|
ocxl_afu_put(afu);
|
|
return rc;
|
|
}
|
|
|
|
list_add_tail(&afu->list, &fn->afu_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void remove_afu(struct ocxl_afu *afu)
|
|
{
|
|
list_del(&afu->list);
|
|
ocxl_context_detach_all(afu);
|
|
deactivate_afu(afu);
|
|
deconfigure_afu(afu);
|
|
ocxl_afu_put(afu); // matches the implicit get in alloc_afu
|
|
}
|
|
|
|
static struct ocxl_fn *alloc_function(void)
|
|
{
|
|
struct ocxl_fn *fn;
|
|
|
|
fn = kzalloc(sizeof(struct ocxl_fn), GFP_KERNEL);
|
|
if (!fn)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&fn->afu_list);
|
|
INIT_LIST_HEAD(&fn->pasid_list);
|
|
INIT_LIST_HEAD(&fn->actag_list);
|
|
|
|
return fn;
|
|
}
|
|
|
|
static void free_function(struct ocxl_fn *fn)
|
|
{
|
|
WARN_ON(!list_empty(&fn->afu_list));
|
|
WARN_ON(!list_empty(&fn->pasid_list));
|
|
kfree(fn);
|
|
}
|
|
|
|
static void free_function_dev(struct device *dev)
|
|
{
|
|
struct ocxl_fn *fn = container_of(dev, struct ocxl_fn, dev);
|
|
|
|
free_function(fn);
|
|
}
|
|
|
|
static int set_function_device(struct ocxl_fn *fn, struct pci_dev *dev)
|
|
{
|
|
fn->dev.parent = &dev->dev;
|
|
fn->dev.release = free_function_dev;
|
|
return dev_set_name(&fn->dev, "ocxlfn.%s", dev_name(&dev->dev));
|
|
}
|
|
|
|
static int assign_function_actag(struct ocxl_fn *fn)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(fn->dev.parent);
|
|
u16 base, enabled, supported;
|
|
int rc;
|
|
|
|
rc = ocxl_config_get_actag_info(dev, &base, &enabled, &supported);
|
|
if (rc)
|
|
return rc;
|
|
|
|
fn->actag_base = base;
|
|
fn->actag_enabled = enabled;
|
|
fn->actag_supported = supported;
|
|
|
|
ocxl_config_set_actag(dev, fn->config.dvsec_function_pos,
|
|
fn->actag_base, fn->actag_enabled);
|
|
dev_dbg(&fn->dev, "actag range starting at %d, enabled %d\n",
|
|
fn->actag_base, fn->actag_enabled);
|
|
return 0;
|
|
}
|
|
|
|
static int set_function_pasid(struct ocxl_fn *fn)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(fn->dev.parent);
|
|
int rc, desired_count, max_count;
|
|
|
|
/* A function may not require any PASID */
|
|
if (fn->config.max_pasid_log < 0)
|
|
return 0;
|
|
|
|
rc = ocxl_config_get_pasid_info(dev, &max_count);
|
|
if (rc)
|
|
return rc;
|
|
|
|
desired_count = 1 << fn->config.max_pasid_log;
|
|
|
|
if (desired_count > max_count) {
|
|
dev_err(&fn->dev,
|
|
"Function requires more PASIDs than is available (%d vs. %d)\n",
|
|
desired_count, max_count);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
fn->pasid_base = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int configure_function(struct ocxl_fn *fn, struct pci_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_enable_device(dev);
|
|
if (rc) {
|
|
dev_err(&dev->dev, "pci_enable_device failed: %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Once it has been confirmed to work on our hardware, we
|
|
* should reset the function, to force the adapter to restart
|
|
* from scratch.
|
|
* A function reset would also reset all its AFUs.
|
|
*
|
|
* Some hints for implementation:
|
|
*
|
|
* - there's not status bit to know when the reset is done. We
|
|
* should try reading the config space to know when it's
|
|
* done.
|
|
* - probably something like:
|
|
* Reset
|
|
* wait 100ms
|
|
* issue config read
|
|
* allow device up to 1 sec to return success on config
|
|
* read before declaring it broken
|
|
*
|
|
* Some shared logic on the card (CFG, TLX) won't be reset, so
|
|
* there's no guarantee that it will be enough.
|
|
*/
|
|
rc = ocxl_config_read_function(dev, &fn->config);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = set_function_device(fn, dev);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = assign_function_actag(fn);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = set_function_pasid(fn);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = ocxl_link_setup(dev, 0, &fn->link);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = ocxl_config_set_TL(dev, fn->config.dvsec_tl_pos);
|
|
if (rc) {
|
|
ocxl_link_release(dev, fn->link);
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void deconfigure_function(struct ocxl_fn *fn)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(fn->dev.parent);
|
|
|
|
ocxl_link_release(dev, fn->link);
|
|
pci_disable_device(dev);
|
|
}
|
|
|
|
static struct ocxl_fn *init_function(struct pci_dev *dev)
|
|
{
|
|
struct ocxl_fn *fn;
|
|
int rc;
|
|
|
|
fn = alloc_function();
|
|
if (!fn)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
rc = configure_function(fn, dev);
|
|
if (rc) {
|
|
free_function(fn);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
rc = device_register(&fn->dev);
|
|
if (rc) {
|
|
deconfigure_function(fn);
|
|
put_device(&fn->dev);
|
|
return ERR_PTR(rc);
|
|
}
|
|
return fn;
|
|
}
|
|
|
|
// Device detection & initialisation
|
|
|
|
struct ocxl_fn *ocxl_function_open(struct pci_dev *dev)
|
|
{
|
|
int rc, afu_count = 0;
|
|
u8 afu;
|
|
struct ocxl_fn *fn;
|
|
|
|
if (!radix_enabled()) {
|
|
dev_err(&dev->dev, "Unsupported memory model (hash)\n");
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
fn = init_function(dev);
|
|
if (IS_ERR(fn)) {
|
|
dev_err(&dev->dev, "function init failed: %li\n",
|
|
PTR_ERR(fn));
|
|
return fn;
|
|
}
|
|
|
|
for (afu = 0; afu <= fn->config.max_afu_index; afu++) {
|
|
rc = ocxl_config_check_afu_index(dev, &fn->config, afu);
|
|
if (rc > 0) {
|
|
rc = init_afu(dev, fn, afu);
|
|
if (rc) {
|
|
dev_err(&dev->dev,
|
|
"Can't initialize AFU index %d\n", afu);
|
|
continue;
|
|
}
|
|
afu_count++;
|
|
}
|
|
}
|
|
dev_info(&dev->dev, "%d AFU(s) configured\n", afu_count);
|
|
return fn;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_function_open);
|
|
|
|
struct list_head *ocxl_function_afu_list(struct ocxl_fn *fn)
|
|
{
|
|
return &fn->afu_list;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_function_afu_list);
|
|
|
|
struct ocxl_afu *ocxl_function_fetch_afu(struct ocxl_fn *fn, u8 afu_idx)
|
|
{
|
|
struct ocxl_afu *afu;
|
|
|
|
list_for_each_entry(afu, &fn->afu_list, list) {
|
|
if (afu->config.idx == afu_idx)
|
|
return afu;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_function_fetch_afu);
|
|
|
|
const struct ocxl_fn_config *ocxl_function_config(struct ocxl_fn *fn)
|
|
{
|
|
return &fn->config;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_function_config);
|
|
|
|
void ocxl_function_close(struct ocxl_fn *fn)
|
|
{
|
|
struct ocxl_afu *afu, *tmp;
|
|
|
|
list_for_each_entry_safe(afu, tmp, &fn->afu_list, list) {
|
|
remove_afu(afu);
|
|
}
|
|
|
|
deconfigure_function(fn);
|
|
device_unregister(&fn->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_function_close);
|
|
|
|
// AFU Metadata
|
|
|
|
struct ocxl_afu_config *ocxl_afu_config(struct ocxl_afu *afu)
|
|
{
|
|
return &afu->config;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_afu_config);
|
|
|
|
void ocxl_afu_set_private(struct ocxl_afu *afu, void *private)
|
|
{
|
|
afu->private = private;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_afu_set_private);
|
|
|
|
void *ocxl_afu_get_private(struct ocxl_afu *afu)
|
|
{
|
|
if (afu)
|
|
return afu->private;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocxl_afu_get_private);
|