swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
Tip revision: 92d21ac74a9e3c09b0b01c764e530657e4c85c49 authored by Linus Torvalds on 11 July 2016, 03:24:59 UTC
Linux 4.7-rc7
Linux 4.7-rc7
Tip revision: 92d21ac
api.c
/*
* Copyright 2014 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/anon_inodes.h>
#include <linux/file.h>
#include <misc/cxl.h>
#include <linux/fs.h>
#include "cxl.h"
struct cxl_context *cxl_dev_context_init(struct pci_dev *dev)
{
struct address_space *mapping;
struct cxl_afu *afu;
struct cxl_context *ctx;
int rc;
afu = cxl_pci_to_afu(dev);
ctx = cxl_context_alloc();
if (IS_ERR(ctx)) {
rc = PTR_ERR(ctx);
goto err_dev;
}
ctx->kernelapi = true;
/*
* Make our own address space since we won't have one from the
* filesystem like the user api has, and even if we do associate a file
* with this context we don't want to use the global anonymous inode's
* address space as that can invalidate unrelated users:
*/
mapping = kmalloc(sizeof(struct address_space), GFP_KERNEL);
if (!mapping) {
rc = -ENOMEM;
goto err_ctx;
}
address_space_init_once(mapping);
/* Make it a slave context. We can promote it later? */
rc = cxl_context_init(ctx, afu, false, mapping);
if (rc)
goto err_mapping;
return ctx;
err_mapping:
kfree(mapping);
err_ctx:
kfree(ctx);
err_dev:
return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(cxl_dev_context_init);
struct cxl_context *cxl_get_context(struct pci_dev *dev)
{
return dev->dev.archdata.cxl_ctx;
}
EXPORT_SYMBOL_GPL(cxl_get_context);
int cxl_release_context(struct cxl_context *ctx)
{
if (ctx->status >= STARTED)
return -EBUSY;
cxl_context_free(ctx);
return 0;
}
EXPORT_SYMBOL_GPL(cxl_release_context);
static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
{
__u16 range;
int r;
for (r = 0; r < CXL_IRQ_RANGES; r++) {
range = ctx->irqs.range[r];
if (num < range) {
return ctx->irqs.offset[r] + num;
}
num -= range;
}
return 0;
}
int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
{
int res;
irq_hw_number_t hwirq;
if (num == 0)
num = ctx->afu->pp_irqs;
res = afu_allocate_irqs(ctx, num);
if (!res && !cpu_has_feature(CPU_FTR_HVMODE)) {
/* In a guest, the PSL interrupt is not multiplexed. It was
* allocated above, and we need to set its handler
*/
hwirq = cxl_find_afu_irq(ctx, 0);
if (hwirq)
cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl");
}
return res;
}
EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
void cxl_free_afu_irqs(struct cxl_context *ctx)
{
irq_hw_number_t hwirq;
unsigned int virq;
if (!cpu_has_feature(CPU_FTR_HVMODE)) {
hwirq = cxl_find_afu_irq(ctx, 0);
if (hwirq) {
virq = irq_find_mapping(NULL, hwirq);
if (virq)
cxl_unmap_irq(virq, ctx);
}
}
afu_irq_name_free(ctx);
cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
}
EXPORT_SYMBOL_GPL(cxl_free_afu_irqs);
int cxl_map_afu_irq(struct cxl_context *ctx, int num,
irq_handler_t handler, void *cookie, char *name)
{
irq_hw_number_t hwirq;
/*
* Find interrupt we are to register.
*/
hwirq = cxl_find_afu_irq(ctx, num);
if (!hwirq)
return -ENOENT;
return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name);
}
EXPORT_SYMBOL_GPL(cxl_map_afu_irq);
void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie)
{
irq_hw_number_t hwirq;
unsigned int virq;
hwirq = cxl_find_afu_irq(ctx, num);
if (!hwirq)
return;
virq = irq_find_mapping(NULL, hwirq);
if (virq)
cxl_unmap_irq(virq, cookie);
}
EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq);
/*
* Start a context
* Code here similar to afu_ioctl_start_work().
*/
int cxl_start_context(struct cxl_context *ctx, u64 wed,
struct task_struct *task)
{
int rc = 0;
bool kernel = true;
pr_devel("%s: pe: %i\n", __func__, ctx->pe);
mutex_lock(&ctx->status_mutex);
if (ctx->status == STARTED)
goto out; /* already started */
if (task) {
ctx->pid = get_task_pid(task, PIDTYPE_PID);
ctx->glpid = get_task_pid(task->group_leader, PIDTYPE_PID);
kernel = false;
ctx->real_mode = false;
}
cxl_ctx_get();
if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
put_pid(ctx->pid);
cxl_ctx_put();
goto out;
}
ctx->status = STARTED;
out:
mutex_unlock(&ctx->status_mutex);
return rc;
}
EXPORT_SYMBOL_GPL(cxl_start_context);
int cxl_process_element(struct cxl_context *ctx)
{
return ctx->external_pe;
}
EXPORT_SYMBOL_GPL(cxl_process_element);
/* Stop a context. Returns 0 on success, otherwise -Errno */
int cxl_stop_context(struct cxl_context *ctx)
{
return __detach_context(ctx);
}
EXPORT_SYMBOL_GPL(cxl_stop_context);
void cxl_set_master(struct cxl_context *ctx)
{
ctx->master = true;
}
EXPORT_SYMBOL_GPL(cxl_set_master);
int cxl_set_translation_mode(struct cxl_context *ctx, bool real_mode)
{
if (ctx->status == STARTED) {
/*
* We could potentially update the PE and issue an update LLCMD
* to support this, but it doesn't seem to have a good use case
* since it's trivial to just create a second kernel context
* with different translation modes, so until someone convinces
* me otherwise:
*/
return -EBUSY;
}
ctx->real_mode = real_mode;
return 0;
}
EXPORT_SYMBOL_GPL(cxl_set_translation_mode);
/* wrappers around afu_* file ops which are EXPORTED */
int cxl_fd_open(struct inode *inode, struct file *file)
{
return afu_open(inode, file);
}
EXPORT_SYMBOL_GPL(cxl_fd_open);
int cxl_fd_release(struct inode *inode, struct file *file)
{
return afu_release(inode, file);
}
EXPORT_SYMBOL_GPL(cxl_fd_release);
long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
return afu_ioctl(file, cmd, arg);
}
EXPORT_SYMBOL_GPL(cxl_fd_ioctl);
int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm)
{
return afu_mmap(file, vm);
}
EXPORT_SYMBOL_GPL(cxl_fd_mmap);
unsigned int cxl_fd_poll(struct file *file, struct poll_table_struct *poll)
{
return afu_poll(file, poll);
}
EXPORT_SYMBOL_GPL(cxl_fd_poll);
ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count,
loff_t *off)
{
return afu_read(file, buf, count, off);
}
EXPORT_SYMBOL_GPL(cxl_fd_read);
#define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME
/* Get a struct file and fd for a context and attach the ops */
struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops,
int *fd)
{
struct file *file;
int rc, flags, fdtmp;
flags = O_RDWR | O_CLOEXEC;
/* This code is similar to anon_inode_getfd() */
rc = get_unused_fd_flags(flags);
if (rc < 0)
return ERR_PTR(rc);
fdtmp = rc;
/*
* Patch the file ops. Needs to be careful that this is rentrant safe.
*/
if (fops) {
PATCH_FOPS(open);
PATCH_FOPS(poll);
PATCH_FOPS(read);
PATCH_FOPS(release);
PATCH_FOPS(unlocked_ioctl);
PATCH_FOPS(compat_ioctl);
PATCH_FOPS(mmap);
} else /* use default ops */
fops = (struct file_operations *)&afu_fops;
file = anon_inode_getfile("cxl", fops, ctx, flags);
if (IS_ERR(file))
goto err_fd;
file->f_mapping = ctx->mapping;
*fd = fdtmp;
return file;
err_fd:
put_unused_fd(fdtmp);
return NULL;
}
EXPORT_SYMBOL_GPL(cxl_get_fd);
struct cxl_context *cxl_fops_get_context(struct file *file)
{
return file->private_data;
}
EXPORT_SYMBOL_GPL(cxl_fops_get_context);
int cxl_start_work(struct cxl_context *ctx,
struct cxl_ioctl_start_work *work)
{
int rc;
/* code taken from afu_ioctl_start_work */
if (!(work->flags & CXL_START_WORK_NUM_IRQS))
work->num_interrupts = ctx->afu->pp_irqs;
else if ((work->num_interrupts < ctx->afu->pp_irqs) ||
(work->num_interrupts > ctx->afu->irqs_max)) {
return -EINVAL;
}
rc = afu_register_irqs(ctx, work->num_interrupts);
if (rc)
return rc;
rc = cxl_start_context(ctx, work->work_element_descriptor, current);
if (rc < 0) {
afu_release_irqs(ctx, ctx);
return rc;
}
return 0;
}
EXPORT_SYMBOL_GPL(cxl_start_work);
void __iomem *cxl_psa_map(struct cxl_context *ctx)
{
if (ctx->status != STARTED)
return NULL;
pr_devel("%s: psn_phys%llx size:%llx\n",
__func__, ctx->psn_phys, ctx->psn_size);
return ioremap(ctx->psn_phys, ctx->psn_size);
}
EXPORT_SYMBOL_GPL(cxl_psa_map);
void cxl_psa_unmap(void __iomem *addr)
{
iounmap(addr);
}
EXPORT_SYMBOL_GPL(cxl_psa_unmap);
int cxl_afu_reset(struct cxl_context *ctx)
{
struct cxl_afu *afu = ctx->afu;
int rc;
rc = cxl_ops->afu_reset(afu);
if (rc)
return rc;
return cxl_ops->afu_check_and_enable(afu);
}
EXPORT_SYMBOL_GPL(cxl_afu_reset);
void cxl_perst_reloads_same_image(struct cxl_afu *afu,
bool perst_reloads_same_image)
{
afu->adapter->perst_same_image = perst_reloads_same_image;
}
EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image);
ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count)
{
struct cxl_afu *afu = cxl_pci_to_afu(dev);
return cxl_ops->read_adapter_vpd(afu->adapter, buf, count);
}
EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd);