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linux-zen-server/drivers/misc/genwqe/card_dev.c

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2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* IBM Accelerator Family 'GenWQE'
*
* (C) Copyright IBM Corp. 2013
*
* Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
* Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
* Author: Michael Jung <mijung@gmx.net>
* Author: Michael Ruettger <michael@ibmra.de>
*/
/*
* Character device representation of the GenWQE device. This allows
* user-space applications to communicate with the card.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/sched/signal.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/atomic.h>
#include "card_base.h"
#include "card_ddcb.h"
static int genwqe_open_files(struct genwqe_dev *cd)
{
int rc;
unsigned long flags;
spin_lock_irqsave(&cd->file_lock, flags);
rc = list_empty(&cd->file_list);
spin_unlock_irqrestore(&cd->file_lock, flags);
return !rc;
}
static void genwqe_add_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
{
unsigned long flags;
cfile->opener = get_pid(task_tgid(current));
spin_lock_irqsave(&cd->file_lock, flags);
list_add(&cfile->list, &cd->file_list);
spin_unlock_irqrestore(&cd->file_lock, flags);
}
static int genwqe_del_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
{
unsigned long flags;
spin_lock_irqsave(&cd->file_lock, flags);
list_del(&cfile->list);
spin_unlock_irqrestore(&cd->file_lock, flags);
put_pid(cfile->opener);
return 0;
}
static void genwqe_add_pin(struct genwqe_file *cfile, struct dma_mapping *m)
{
unsigned long flags;
spin_lock_irqsave(&cfile->pin_lock, flags);
list_add(&m->pin_list, &cfile->pin_list);
spin_unlock_irqrestore(&cfile->pin_lock, flags);
}
static int genwqe_del_pin(struct genwqe_file *cfile, struct dma_mapping *m)
{
unsigned long flags;
spin_lock_irqsave(&cfile->pin_lock, flags);
list_del(&m->pin_list);
spin_unlock_irqrestore(&cfile->pin_lock, flags);
return 0;
}
/**
* genwqe_search_pin() - Search for the mapping for a userspace address
* @cfile: Descriptor of opened file
* @u_addr: User virtual address
* @size: Size of buffer
* @virt_addr: Virtual address to be updated
*
* Return: Pointer to the corresponding mapping NULL if not found
*/
static struct dma_mapping *genwqe_search_pin(struct genwqe_file *cfile,
unsigned long u_addr,
unsigned int size,
void **virt_addr)
{
unsigned long flags;
struct dma_mapping *m;
spin_lock_irqsave(&cfile->pin_lock, flags);
list_for_each_entry(m, &cfile->pin_list, pin_list) {
if ((((u64)m->u_vaddr) <= (u_addr)) &&
(((u64)m->u_vaddr + m->size) >= (u_addr + size))) {
if (virt_addr)
*virt_addr = m->k_vaddr +
(u_addr - (u64)m->u_vaddr);
spin_unlock_irqrestore(&cfile->pin_lock, flags);
return m;
}
}
spin_unlock_irqrestore(&cfile->pin_lock, flags);
return NULL;
}
static void __genwqe_add_mapping(struct genwqe_file *cfile,
struct dma_mapping *dma_map)
{
unsigned long flags;
spin_lock_irqsave(&cfile->map_lock, flags);
list_add(&dma_map->card_list, &cfile->map_list);
spin_unlock_irqrestore(&cfile->map_lock, flags);
}
static void __genwqe_del_mapping(struct genwqe_file *cfile,
struct dma_mapping *dma_map)
{
unsigned long flags;
spin_lock_irqsave(&cfile->map_lock, flags);
list_del(&dma_map->card_list);
spin_unlock_irqrestore(&cfile->map_lock, flags);
}
/**
* __genwqe_search_mapping() - Search for the mapping for a userspace address
* @cfile: descriptor of opened file
* @u_addr: user virtual address
* @size: size of buffer
* @dma_addr: DMA address to be updated
* @virt_addr: Virtual address to be updated
* Return: Pointer to the corresponding mapping NULL if not found
*/
static struct dma_mapping *__genwqe_search_mapping(struct genwqe_file *cfile,
unsigned long u_addr,
unsigned int size,
dma_addr_t *dma_addr,
void **virt_addr)
{
unsigned long flags;
struct dma_mapping *m;
struct pci_dev *pci_dev = cfile->cd->pci_dev;
spin_lock_irqsave(&cfile->map_lock, flags);
list_for_each_entry(m, &cfile->map_list, card_list) {
if ((((u64)m->u_vaddr) <= (u_addr)) &&
(((u64)m->u_vaddr + m->size) >= (u_addr + size))) {
/* match found: current is as expected and
addr is in range */
if (dma_addr)
*dma_addr = m->dma_addr +
(u_addr - (u64)m->u_vaddr);
if (virt_addr)
*virt_addr = m->k_vaddr +
(u_addr - (u64)m->u_vaddr);
spin_unlock_irqrestore(&cfile->map_lock, flags);
return m;
}
}
spin_unlock_irqrestore(&cfile->map_lock, flags);
dev_err(&pci_dev->dev,
"[%s] Entry not found: u_addr=%lx, size=%x\n",
__func__, u_addr, size);
return NULL;
}
static void genwqe_remove_mappings(struct genwqe_file *cfile)
{
int i = 0;
struct list_head *node, *next;
struct dma_mapping *dma_map;
struct genwqe_dev *cd = cfile->cd;
struct pci_dev *pci_dev = cfile->cd->pci_dev;
list_for_each_safe(node, next, &cfile->map_list) {
dma_map = list_entry(node, struct dma_mapping, card_list);
list_del_init(&dma_map->card_list);
/*
* This is really a bug, because those things should
* have been already tidied up.
*
* GENWQE_MAPPING_RAW should have been removed via mmunmap().
* GENWQE_MAPPING_SGL_TEMP should be removed by tidy up code.
*/
dev_err(&pci_dev->dev,
"[%s] %d. cleanup mapping: u_vaddr=%p u_kaddr=%016lx dma_addr=%lx\n",
__func__, i++, dma_map->u_vaddr,
(unsigned long)dma_map->k_vaddr,
(unsigned long)dma_map->dma_addr);
if (dma_map->type == GENWQE_MAPPING_RAW) {
/* we allocated this dynamically */
__genwqe_free_consistent(cd, dma_map->size,
dma_map->k_vaddr,
dma_map->dma_addr);
kfree(dma_map);
} else if (dma_map->type == GENWQE_MAPPING_SGL_TEMP) {
/* we use dma_map statically from the request */
genwqe_user_vunmap(cd, dma_map);
}
}
}
static void genwqe_remove_pinnings(struct genwqe_file *cfile)
{
struct list_head *node, *next;
struct dma_mapping *dma_map;
struct genwqe_dev *cd = cfile->cd;
list_for_each_safe(node, next, &cfile->pin_list) {
dma_map = list_entry(node, struct dma_mapping, pin_list);
/*
* This is not a bug, because a killed processed might
* not call the unpin ioctl, which is supposed to free
* the resources.
*
* Pinnings are dymically allocated and need to be
* deleted.
*/
list_del_init(&dma_map->pin_list);
genwqe_user_vunmap(cd, dma_map);
kfree(dma_map);
}
}
/**
* genwqe_kill_fasync() - Send signal to all processes with open GenWQE files
* @cd: GenWQE device information
* @sig: Signal to send out
*
* E.g. genwqe_send_signal(cd, SIGIO);
*/
static int genwqe_kill_fasync(struct genwqe_dev *cd, int sig)
{
unsigned int files = 0;
unsigned long flags;
struct genwqe_file *cfile;
spin_lock_irqsave(&cd->file_lock, flags);
list_for_each_entry(cfile, &cd->file_list, list) {
if (cfile->async_queue)
kill_fasync(&cfile->async_queue, sig, POLL_HUP);
files++;
}
spin_unlock_irqrestore(&cd->file_lock, flags);
return files;
}
static int genwqe_terminate(struct genwqe_dev *cd)
{
unsigned int files = 0;
unsigned long flags;
struct genwqe_file *cfile;
spin_lock_irqsave(&cd->file_lock, flags);
list_for_each_entry(cfile, &cd->file_list, list) {
kill_pid(cfile->opener, SIGKILL, 1);
files++;
}
spin_unlock_irqrestore(&cd->file_lock, flags);
return files;
}
/**
* genwqe_open() - file open
* @inode: file system information
* @filp: file handle
*
* This function is executed whenever an application calls
* open("/dev/genwqe",..).
*
* Return: 0 if successful or <0 if errors
*/
static int genwqe_open(struct inode *inode, struct file *filp)
{
struct genwqe_dev *cd;
struct genwqe_file *cfile;
cfile = kzalloc(sizeof(*cfile), GFP_KERNEL);
if (cfile == NULL)
return -ENOMEM;
cd = container_of(inode->i_cdev, struct genwqe_dev, cdev_genwqe);
cfile->cd = cd;
cfile->filp = filp;
cfile->client = NULL;
spin_lock_init(&cfile->map_lock); /* list of raw memory allocations */
INIT_LIST_HEAD(&cfile->map_list);
spin_lock_init(&cfile->pin_lock); /* list of user pinned memory */
INIT_LIST_HEAD(&cfile->pin_list);
filp->private_data = cfile;
genwqe_add_file(cd, cfile);
return 0;
}
/**
* genwqe_fasync() - Setup process to receive SIGIO.
* @fd: file descriptor
* @filp: file handle
* @mode: file mode
*
* Sending a signal is working as following:
*
* if (cdev->async_queue)
* kill_fasync(&cdev->async_queue, SIGIO, POLL_IN);
*
* Some devices also implement asynchronous notification to indicate
* when the device can be written; in this case, of course,
* kill_fasync must be called with a mode of POLL_OUT.
*/
static int genwqe_fasync(int fd, struct file *filp, int mode)
{
struct genwqe_file *cdev = (struct genwqe_file *)filp->private_data;
return fasync_helper(fd, filp, mode, &cdev->async_queue);
}
/**
* genwqe_release() - file close
* @inode: file system information
* @filp: file handle
*
* This function is executed whenever an application calls 'close(fd_genwqe)'
*
* Return: always 0
*/
static int genwqe_release(struct inode *inode, struct file *filp)
{
struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
struct genwqe_dev *cd = cfile->cd;
/* there must be no entries in these lists! */
genwqe_remove_mappings(cfile);
genwqe_remove_pinnings(cfile);
/* remove this filp from the asynchronously notified filp's */
genwqe_fasync(-1, filp, 0);
/*
* For this to work we must not release cd when this cfile is
* not yet released, otherwise the list entry is invalid,
* because the list itself gets reinstantiated!
*/
genwqe_del_file(cd, cfile);
kfree(cfile);
return 0;
}
static void genwqe_vma_open(struct vm_area_struct *vma)
{
/* nothing ... */
}
/**
* genwqe_vma_close() - Called each time when vma is unmapped
* @vma: VMA area to close
*
* Free memory which got allocated by GenWQE mmap().
*/
static void genwqe_vma_close(struct vm_area_struct *vma)
{
unsigned long vsize = vma->vm_end - vma->vm_start;
struct inode *inode = file_inode(vma->vm_file);
struct dma_mapping *dma_map;
struct genwqe_dev *cd = container_of(inode->i_cdev, struct genwqe_dev,
cdev_genwqe);
struct pci_dev *pci_dev = cd->pci_dev;
dma_addr_t d_addr = 0;
struct genwqe_file *cfile = vma->vm_private_data;
dma_map = __genwqe_search_mapping(cfile, vma->vm_start, vsize,
&d_addr, NULL);
if (dma_map == NULL) {
dev_err(&pci_dev->dev,
" [%s] err: mapping not found: v=%lx, p=%lx s=%lx\n",
__func__, vma->vm_start, vma->vm_pgoff << PAGE_SHIFT,
vsize);
return;
}
__genwqe_del_mapping(cfile, dma_map);
__genwqe_free_consistent(cd, dma_map->size, dma_map->k_vaddr,
dma_map->dma_addr);
kfree(dma_map);
}
static const struct vm_operations_struct genwqe_vma_ops = {
.open = genwqe_vma_open,
.close = genwqe_vma_close,
};
/**
* genwqe_mmap() - Provide contignous buffers to userspace
* @filp: File pointer (unused)
* @vma: VMA area to map
*
* We use mmap() to allocate contignous buffers used for DMA
* transfers. After the buffer is allocated we remap it to user-space
* and remember a reference to our dma_mapping data structure, where
* we store the associated DMA address and allocated size.
*
* When we receive a DDCB execution request with the ATS bits set to
* plain buffer, we lookup our dma_mapping list to find the
* corresponding DMA address for the associated user-space address.
*/
static int genwqe_mmap(struct file *filp, struct vm_area_struct *vma)
{
int rc;
unsigned long pfn, vsize = vma->vm_end - vma->vm_start;
struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
struct genwqe_dev *cd = cfile->cd;
struct dma_mapping *dma_map;
if (vsize == 0)
return -EINVAL;
if (get_order(vsize) > MAX_ORDER)
return -ENOMEM;
dma_map = kzalloc(sizeof(struct dma_mapping), GFP_KERNEL);
if (dma_map == NULL)
return -ENOMEM;
genwqe_mapping_init(dma_map, GENWQE_MAPPING_RAW);
dma_map->u_vaddr = (void *)vma->vm_start;
dma_map->size = vsize;
dma_map->nr_pages = DIV_ROUND_UP(vsize, PAGE_SIZE);
dma_map->k_vaddr = __genwqe_alloc_consistent(cd, vsize,
&dma_map->dma_addr);
if (dma_map->k_vaddr == NULL) {
rc = -ENOMEM;
goto free_dma_map;
}
if (capable(CAP_SYS_ADMIN) && (vsize > sizeof(dma_addr_t)))
*(dma_addr_t *)dma_map->k_vaddr = dma_map->dma_addr;
pfn = virt_to_phys(dma_map->k_vaddr) >> PAGE_SHIFT;
rc = remap_pfn_range(vma,
vma->vm_start,
pfn,
vsize,
vma->vm_page_prot);
if (rc != 0) {
rc = -EFAULT;
goto free_dma_mem;
}
vma->vm_private_data = cfile;
vma->vm_ops = &genwqe_vma_ops;
__genwqe_add_mapping(cfile, dma_map);
return 0;
free_dma_mem:
__genwqe_free_consistent(cd, dma_map->size,
dma_map->k_vaddr,
dma_map->dma_addr);
free_dma_map:
kfree(dma_map);
return rc;
}
#define FLASH_BLOCK 0x40000 /* we use 256k blocks */
/**
* do_flash_update() - Excute flash update (write image or CVPD)
* @cfile: Descriptor of opened file
* @load: details about image load
*
* Return: 0 if successful
*/
static int do_flash_update(struct genwqe_file *cfile,
struct genwqe_bitstream *load)
{
int rc = 0;
int blocks_to_flash;
dma_addr_t dma_addr;
u64 flash = 0;
size_t tocopy = 0;
u8 __user *buf;
u8 *xbuf;
u32 crc;
u8 cmdopts;
struct genwqe_dev *cd = cfile->cd;
struct file *filp = cfile->filp;
struct pci_dev *pci_dev = cd->pci_dev;
if ((load->size & 0x3) != 0)
return -EINVAL;
if (((unsigned long)(load->data_addr) & ~PAGE_MASK) != 0)
return -EINVAL;
/* FIXME Bits have changed for new service layer! */
switch ((char)load->partition) {
case '0':
cmdopts = 0x14;
break; /* download/erase_first/part_0 */
case '1':
cmdopts = 0x1C;
break; /* download/erase_first/part_1 */
case 'v':
cmdopts = 0x0C;
break; /* download/erase_first/vpd */
default:
return -EINVAL;
}
buf = (u8 __user *)load->data_addr;
xbuf = __genwqe_alloc_consistent(cd, FLASH_BLOCK, &dma_addr);
if (xbuf == NULL)
return -ENOMEM;
blocks_to_flash = load->size / FLASH_BLOCK;
while (load->size) {
struct genwqe_ddcb_cmd *req;
/*
* We must be 4 byte aligned. Buffer must be 0 appened
* to have defined values when calculating CRC.
*/
tocopy = min_t(size_t, load->size, FLASH_BLOCK);
rc = copy_from_user(xbuf, buf, tocopy);
if (rc) {
rc = -EFAULT;
goto free_buffer;
}
crc = genwqe_crc32(xbuf, tocopy, 0xffffffff);
dev_dbg(&pci_dev->dev,
"[%s] DMA: %lx CRC: %08x SZ: %ld %d\n",
__func__, (unsigned long)dma_addr, crc, tocopy,
blocks_to_flash);
/* prepare DDCB for SLU process */
req = ddcb_requ_alloc();
if (req == NULL) {
rc = -ENOMEM;
goto free_buffer;
}
req->cmd = SLCMD_MOVE_FLASH;
req->cmdopts = cmdopts;
/* prepare invariant values */
if (genwqe_get_slu_id(cd) <= 0x2) {
*(__be64 *)&req->__asiv[0] = cpu_to_be64(dma_addr);
*(__be64 *)&req->__asiv[8] = cpu_to_be64(tocopy);
*(__be64 *)&req->__asiv[16] = cpu_to_be64(flash);
*(__be32 *)&req->__asiv[24] = cpu_to_be32(0);
req->__asiv[24] = load->uid;
*(__be32 *)&req->__asiv[28] = cpu_to_be32(crc);
/* for simulation only */
*(__be64 *)&req->__asiv[88] = cpu_to_be64(load->slu_id);
*(__be64 *)&req->__asiv[96] = cpu_to_be64(load->app_id);
req->asiv_length = 32; /* bytes included in crc calc */
} else { /* setup DDCB for ATS architecture */
*(__be64 *)&req->asiv[0] = cpu_to_be64(dma_addr);
*(__be32 *)&req->asiv[8] = cpu_to_be32(tocopy);
*(__be32 *)&req->asiv[12] = cpu_to_be32(0); /* resvd */
*(__be64 *)&req->asiv[16] = cpu_to_be64(flash);
*(__be32 *)&req->asiv[24] = cpu_to_be32(load->uid<<24);
*(__be32 *)&req->asiv[28] = cpu_to_be32(crc);
/* for simulation only */
*(__be64 *)&req->asiv[80] = cpu_to_be64(load->slu_id);
*(__be64 *)&req->asiv[88] = cpu_to_be64(load->app_id);
/* Rd only */
req->ats = 0x4ULL << 44;
req->asiv_length = 40; /* bytes included in crc calc */
}
req->asv_length = 8;
/* For Genwqe5 we get back the calculated CRC */
*(u64 *)&req->asv[0] = 0ULL; /* 0x80 */
rc = __genwqe_execute_raw_ddcb(cd, req, filp->f_flags);
load->retc = req->retc;
load->attn = req->attn;
load->progress = req->progress;
if (rc < 0) {
ddcb_requ_free(req);
goto free_buffer;
}
if (req->retc != DDCB_RETC_COMPLETE) {
rc = -EIO;
ddcb_requ_free(req);
goto free_buffer;
}
load->size -= tocopy;
flash += tocopy;
buf += tocopy;
blocks_to_flash--;
ddcb_requ_free(req);
}
free_buffer:
__genwqe_free_consistent(cd, FLASH_BLOCK, xbuf, dma_addr);
return rc;
}
static int do_flash_read(struct genwqe_file *cfile,
struct genwqe_bitstream *load)
{
int rc, blocks_to_flash;
dma_addr_t dma_addr;
u64 flash = 0;
size_t tocopy = 0;
u8 __user *buf;
u8 *xbuf;
u8 cmdopts;
struct genwqe_dev *cd = cfile->cd;
struct file *filp = cfile->filp;
struct pci_dev *pci_dev = cd->pci_dev;
struct genwqe_ddcb_cmd *cmd;
if ((load->size & 0x3) != 0)
return -EINVAL;
if (((unsigned long)(load->data_addr) & ~PAGE_MASK) != 0)
return -EINVAL;
/* FIXME Bits have changed for new service layer! */
switch ((char)load->partition) {
case '0':
cmdopts = 0x12;
break; /* upload/part_0 */
case '1':
cmdopts = 0x1A;
break; /* upload/part_1 */
case 'v':
cmdopts = 0x0A;
break; /* upload/vpd */
default:
return -EINVAL;
}
buf = (u8 __user *)load->data_addr;
xbuf = __genwqe_alloc_consistent(cd, FLASH_BLOCK, &dma_addr);
if (xbuf == NULL)
return -ENOMEM;
blocks_to_flash = load->size / FLASH_BLOCK;
while (load->size) {
/*
* We must be 4 byte aligned. Buffer must be 0 appened
* to have defined values when calculating CRC.
*/
tocopy = min_t(size_t, load->size, FLASH_BLOCK);
dev_dbg(&pci_dev->dev,
"[%s] DMA: %lx SZ: %ld %d\n",
__func__, (unsigned long)dma_addr, tocopy,
blocks_to_flash);
/* prepare DDCB for SLU process */
cmd = ddcb_requ_alloc();
if (cmd == NULL) {
rc = -ENOMEM;
goto free_buffer;
}
cmd->cmd = SLCMD_MOVE_FLASH;
cmd->cmdopts = cmdopts;
/* prepare invariant values */
if (genwqe_get_slu_id(cd) <= 0x2) {
*(__be64 *)&cmd->__asiv[0] = cpu_to_be64(dma_addr);
*(__be64 *)&cmd->__asiv[8] = cpu_to_be64(tocopy);
*(__be64 *)&cmd->__asiv[16] = cpu_to_be64(flash);
*(__be32 *)&cmd->__asiv[24] = cpu_to_be32(0);
cmd->__asiv[24] = load->uid;
*(__be32 *)&cmd->__asiv[28] = cpu_to_be32(0) /* CRC */;
cmd->asiv_length = 32; /* bytes included in crc calc */
} else { /* setup DDCB for ATS architecture */
*(__be64 *)&cmd->asiv[0] = cpu_to_be64(dma_addr);
*(__be32 *)&cmd->asiv[8] = cpu_to_be32(tocopy);
*(__be32 *)&cmd->asiv[12] = cpu_to_be32(0); /* resvd */
*(__be64 *)&cmd->asiv[16] = cpu_to_be64(flash);
*(__be32 *)&cmd->asiv[24] = cpu_to_be32(load->uid<<24);
*(__be32 *)&cmd->asiv[28] = cpu_to_be32(0); /* CRC */
/* rd/wr */
cmd->ats = 0x5ULL << 44;
cmd->asiv_length = 40; /* bytes included in crc calc */
}
cmd->asv_length = 8;
/* we only get back the calculated CRC */
*(u64 *)&cmd->asv[0] = 0ULL; /* 0x80 */
rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
load->retc = cmd->retc;
load->attn = cmd->attn;
load->progress = cmd->progress;
if ((rc < 0) && (rc != -EBADMSG)) {
ddcb_requ_free(cmd);
goto free_buffer;
}
rc = copy_to_user(buf, xbuf, tocopy);
if (rc) {
rc = -EFAULT;
ddcb_requ_free(cmd);
goto free_buffer;
}
/* We know that we can get retc 0x104 with CRC err */
if (((cmd->retc == DDCB_RETC_FAULT) &&
(cmd->attn != 0x02)) || /* Normally ignore CRC error */
((cmd->retc == DDCB_RETC_COMPLETE) &&
(cmd->attn != 0x00))) { /* Everything was fine */
rc = -EIO;
ddcb_requ_free(cmd);
goto free_buffer;
}
load->size -= tocopy;
flash += tocopy;
buf += tocopy;
blocks_to_flash--;
ddcb_requ_free(cmd);
}
rc = 0;
free_buffer:
__genwqe_free_consistent(cd, FLASH_BLOCK, xbuf, dma_addr);
return rc;
}
static int genwqe_pin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
{
int rc;
struct genwqe_dev *cd = cfile->cd;
struct pci_dev *pci_dev = cfile->cd->pci_dev;
struct dma_mapping *dma_map;
unsigned long map_addr;
unsigned long map_size;
if ((m->addr == 0x0) || (m->size == 0))
return -EINVAL;
if (m->size > ULONG_MAX - PAGE_SIZE - (m->addr & ~PAGE_MASK))
return -EINVAL;
map_addr = (m->addr & PAGE_MASK);
map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
dma_map = kzalloc(sizeof(struct dma_mapping), GFP_KERNEL);
if (dma_map == NULL)
return -ENOMEM;
genwqe_mapping_init(dma_map, GENWQE_MAPPING_SGL_PINNED);
rc = genwqe_user_vmap(cd, dma_map, (void *)map_addr, map_size);
if (rc != 0) {
dev_err(&pci_dev->dev,
"[%s] genwqe_user_vmap rc=%d\n", __func__, rc);
kfree(dma_map);
return rc;
}
genwqe_add_pin(cfile, dma_map);
return 0;
}
static int genwqe_unpin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
{
struct genwqe_dev *cd = cfile->cd;
struct dma_mapping *dma_map;
unsigned long map_addr;
unsigned long map_size;
if (m->addr == 0x0)
return -EINVAL;
map_addr = (m->addr & PAGE_MASK);
map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
dma_map = genwqe_search_pin(cfile, map_addr, map_size, NULL);
if (dma_map == NULL)
return -ENOENT;
genwqe_del_pin(cfile, dma_map);
genwqe_user_vunmap(cd, dma_map);
kfree(dma_map);
return 0;
}
/**
* ddcb_cmd_cleanup() - Remove dynamically created fixup entries
* @cfile: Descriptor of opened file
* @req: DDCB work request
*
* Only if there are any. Pinnings are not removed.
*/
static int ddcb_cmd_cleanup(struct genwqe_file *cfile, struct ddcb_requ *req)
{
unsigned int i;
struct dma_mapping *dma_map;
struct genwqe_dev *cd = cfile->cd;
for (i = 0; i < DDCB_FIXUPS; i++) {
dma_map = &req->dma_mappings[i];
if (dma_mapping_used(dma_map)) {
__genwqe_del_mapping(cfile, dma_map);
genwqe_user_vunmap(cd, dma_map);
}
if (req->sgls[i].sgl != NULL)
genwqe_free_sync_sgl(cd, &req->sgls[i]);
}
return 0;
}
/**
* ddcb_cmd_fixups() - Establish DMA fixups/sglists for user memory references
* @cfile: Descriptor of opened file
* @req: DDCB work request
*
* Before the DDCB gets executed we need to handle the fixups. We
* replace the user-space addresses with DMA addresses or do
* additional setup work e.g. generating a scatter-gather list which
* is used to describe the memory referred to in the fixup.
*/
static int ddcb_cmd_fixups(struct genwqe_file *cfile, struct ddcb_requ *req)
{
int rc;
unsigned int asiv_offs, i;
struct genwqe_dev *cd = cfile->cd;
struct genwqe_ddcb_cmd *cmd = &req->cmd;
struct dma_mapping *m;
for (i = 0, asiv_offs = 0x00; asiv_offs <= 0x58;
i++, asiv_offs += 0x08) {
u64 u_addr;
dma_addr_t d_addr;
u32 u_size = 0;
u64 ats_flags;
ats_flags = ATS_GET_FLAGS(cmd->ats, asiv_offs);
switch (ats_flags) {
case ATS_TYPE_DATA:
break; /* nothing to do here */
case ATS_TYPE_FLAT_RDWR:
case ATS_TYPE_FLAT_RD: {
u_addr = be64_to_cpu(*((__be64 *)&cmd->
asiv[asiv_offs]));
u_size = be32_to_cpu(*((__be32 *)&cmd->
asiv[asiv_offs + 0x08]));
/*
* No data available. Ignore u_addr in this
* case and set addr to 0. Hardware must not
* fetch the buffer.
*/
if (u_size == 0x0) {
*((__be64 *)&cmd->asiv[asiv_offs]) =
cpu_to_be64(0x0);
break;
}
m = __genwqe_search_mapping(cfile, u_addr, u_size,
&d_addr, NULL);
if (m == NULL) {
rc = -EFAULT;
goto err_out;
}
*((__be64 *)&cmd->asiv[asiv_offs]) =
cpu_to_be64(d_addr);
break;
}
case ATS_TYPE_SGL_RDWR:
case ATS_TYPE_SGL_RD: {
int page_offs;
u_addr = be64_to_cpu(*((__be64 *)
&cmd->asiv[asiv_offs]));
u_size = be32_to_cpu(*((__be32 *)
&cmd->asiv[asiv_offs + 0x08]));
/*
* No data available. Ignore u_addr in this
* case and set addr to 0. Hardware must not
* fetch the empty sgl.
*/
if (u_size == 0x0) {
*((__be64 *)&cmd->asiv[asiv_offs]) =
cpu_to_be64(0x0);
break;
}
m = genwqe_search_pin(cfile, u_addr, u_size, NULL);
if (m != NULL) {
page_offs = (u_addr -
(u64)m->u_vaddr)/PAGE_SIZE;
} else {
m = &req->dma_mappings[i];
genwqe_mapping_init(m,
GENWQE_MAPPING_SGL_TEMP);
if (ats_flags == ATS_TYPE_SGL_RD)
m->write = 0;
rc = genwqe_user_vmap(cd, m, (void *)u_addr,
u_size);
if (rc != 0)
goto err_out;
__genwqe_add_mapping(cfile, m);
page_offs = 0;
}
/* create genwqe style scatter gather list */
rc = genwqe_alloc_sync_sgl(cd, &req->sgls[i],
(void __user *)u_addr,
u_size, m->write);
if (rc != 0)
goto err_out;
genwqe_setup_sgl(cd, &req->sgls[i],
&m->dma_list[page_offs]);
*((__be64 *)&cmd->asiv[asiv_offs]) =
cpu_to_be64(req->sgls[i].sgl_dma_addr);
break;
}
default:
rc = -EINVAL;
goto err_out;
}
}
return 0;
err_out:
ddcb_cmd_cleanup(cfile, req);
return rc;
}
/**
* genwqe_execute_ddcb() - Execute DDCB using userspace address fixups
* @cfile: Descriptor of opened file
* @cmd: Command identifier (passed from user)
*
* The code will build up the translation tables or lookup the
* contignous memory allocation table to find the right translations
* and DMA addresses.
*/
static int genwqe_execute_ddcb(struct genwqe_file *cfile,
struct genwqe_ddcb_cmd *cmd)
{
int rc;
struct genwqe_dev *cd = cfile->cd;
struct file *filp = cfile->filp;
struct ddcb_requ *req = container_of(cmd, struct ddcb_requ, cmd);
rc = ddcb_cmd_fixups(cfile, req);
if (rc != 0)
return rc;
rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
ddcb_cmd_cleanup(cfile, req);
return rc;
}
static int do_execute_ddcb(struct genwqe_file *cfile,
unsigned long arg, int raw)
{
int rc;
struct genwqe_ddcb_cmd *cmd;
struct genwqe_dev *cd = cfile->cd;
struct file *filp = cfile->filp;
cmd = ddcb_requ_alloc();
if (cmd == NULL)
return -ENOMEM;
if (copy_from_user(cmd, (void __user *)arg, sizeof(*cmd))) {
ddcb_requ_free(cmd);
return -EFAULT;
}
if (!raw)
rc = genwqe_execute_ddcb(cfile, cmd);
else
rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
/* Copy back only the modifed fields. Do not copy ASIV
back since the copy got modified by the driver. */
if (copy_to_user((void __user *)arg, cmd,
sizeof(*cmd) - DDCB_ASIV_LENGTH)) {
ddcb_requ_free(cmd);
return -EFAULT;
}
ddcb_requ_free(cmd);
return rc;
}
/**
* genwqe_ioctl() - IO control
* @filp: file handle
* @cmd: command identifier (passed from user)
* @arg: argument (passed from user)
*
* Return: 0 success
*/
static long genwqe_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
int rc = 0;
struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
struct genwqe_dev *cd = cfile->cd;
struct pci_dev *pci_dev = cd->pci_dev;
struct genwqe_reg_io __user *io;
u64 val;
u32 reg_offs;
/* Return -EIO if card hit EEH */
if (pci_channel_offline(pci_dev))
return -EIO;
if (_IOC_TYPE(cmd) != GENWQE_IOC_CODE)
return -EINVAL;
switch (cmd) {
case GENWQE_GET_CARD_STATE:
put_user(cd->card_state, (enum genwqe_card_state __user *)arg);
return 0;
/* Register access */
case GENWQE_READ_REG64: {
io = (struct genwqe_reg_io __user *)arg;
if (get_user(reg_offs, &io->num))
return -EFAULT;
if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
return -EINVAL;
val = __genwqe_readq(cd, reg_offs);
put_user(val, &io->val64);
return 0;
}
case GENWQE_WRITE_REG64: {
io = (struct genwqe_reg_io __user *)arg;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
return -EPERM;
if (get_user(reg_offs, &io->num))
return -EFAULT;
if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
return -EINVAL;
if (get_user(val, &io->val64))
return -EFAULT;
__genwqe_writeq(cd, reg_offs, val);
return 0;
}
case GENWQE_READ_REG32: {
io = (struct genwqe_reg_io __user *)arg;
if (get_user(reg_offs, &io->num))
return -EFAULT;
if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
return -EINVAL;
val = __genwqe_readl(cd, reg_offs);
put_user(val, &io->val64);
return 0;
}
case GENWQE_WRITE_REG32: {
io = (struct genwqe_reg_io __user *)arg;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
return -EPERM;
if (get_user(reg_offs, &io->num))
return -EFAULT;
if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
return -EINVAL;
if (get_user(val, &io->val64))
return -EFAULT;
__genwqe_writel(cd, reg_offs, val);
return 0;
}
/* Flash update/reading */
case GENWQE_SLU_UPDATE: {
struct genwqe_bitstream load;
if (!genwqe_is_privileged(cd))
return -EPERM;
if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
return -EPERM;
if (copy_from_user(&load, (void __user *)arg,
sizeof(load)))
return -EFAULT;
rc = do_flash_update(cfile, &load);
if (copy_to_user((void __user *)arg, &load, sizeof(load)))
return -EFAULT;
return rc;
}
case GENWQE_SLU_READ: {
struct genwqe_bitstream load;
if (!genwqe_is_privileged(cd))
return -EPERM;
if (genwqe_flash_readback_fails(cd))
return -ENOSPC; /* known to fail for old versions */
if (copy_from_user(&load, (void __user *)arg, sizeof(load)))
return -EFAULT;
rc = do_flash_read(cfile, &load);
if (copy_to_user((void __user *)arg, &load, sizeof(load)))
return -EFAULT;
return rc;
}
/* memory pinning and unpinning */
case GENWQE_PIN_MEM: {
struct genwqe_mem m;
if (copy_from_user(&m, (void __user *)arg, sizeof(m)))
return -EFAULT;
return genwqe_pin_mem(cfile, &m);
}
case GENWQE_UNPIN_MEM: {
struct genwqe_mem m;
if (copy_from_user(&m, (void __user *)arg, sizeof(m)))
return -EFAULT;
return genwqe_unpin_mem(cfile, &m);
}
/* launch an DDCB and wait for completion */
case GENWQE_EXECUTE_DDCB:
return do_execute_ddcb(cfile, arg, 0);
case GENWQE_EXECUTE_RAW_DDCB: {
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return do_execute_ddcb(cfile, arg, 1);
}
default:
return -EINVAL;
}
return rc;
}
static const struct file_operations genwqe_fops = {
.owner = THIS_MODULE,
.open = genwqe_open,
.fasync = genwqe_fasync,
.mmap = genwqe_mmap,
.unlocked_ioctl = genwqe_ioctl,
.compat_ioctl = compat_ptr_ioctl,
.release = genwqe_release,
};
static int genwqe_device_initialized(struct genwqe_dev *cd)
{
return cd->dev != NULL;
}
/**
* genwqe_device_create() - Create and configure genwqe char device
* @cd: genwqe device descriptor
*
* This function must be called before we create any more genwqe
* character devices, because it is allocating the major and minor
* number which are supposed to be used by the client drivers.
*/
int genwqe_device_create(struct genwqe_dev *cd)
{
int rc;
struct pci_dev *pci_dev = cd->pci_dev;
/*
* Here starts the individual setup per client. It must
* initialize its own cdev data structure with its own fops.
* The appropriate devnum needs to be created. The ranges must
* not overlap.
*/
rc = alloc_chrdev_region(&cd->devnum_genwqe, 0,
GENWQE_MAX_MINOR, GENWQE_DEVNAME);
if (rc < 0) {
dev_err(&pci_dev->dev, "err: alloc_chrdev_region failed\n");
goto err_dev;
}
cdev_init(&cd->cdev_genwqe, &genwqe_fops);
cd->cdev_genwqe.owner = THIS_MODULE;
rc = cdev_add(&cd->cdev_genwqe, cd->devnum_genwqe, 1);
if (rc < 0) {
dev_err(&pci_dev->dev, "err: cdev_add failed\n");
goto err_add;
}
/*
* Finally the device in /dev/... must be created. The rule is
* to use card%d_clientname for each created device.
*/
cd->dev = device_create_with_groups(cd->class_genwqe,
&cd->pci_dev->dev,
cd->devnum_genwqe, cd,
genwqe_attribute_groups,
GENWQE_DEVNAME "%u_card",
cd->card_idx);
if (IS_ERR(cd->dev)) {
rc = PTR_ERR(cd->dev);
goto err_cdev;
}
genwqe_init_debugfs(cd);
return 0;
err_cdev:
cdev_del(&cd->cdev_genwqe);
err_add:
unregister_chrdev_region(cd->devnum_genwqe, GENWQE_MAX_MINOR);
err_dev:
cd->dev = NULL;
return rc;
}
static int genwqe_inform_and_stop_processes(struct genwqe_dev *cd)
{
int rc;
unsigned int i;
struct pci_dev *pci_dev = cd->pci_dev;
if (!genwqe_open_files(cd))
return 0;
dev_warn(&pci_dev->dev, "[%s] send SIGIO and wait ...\n", __func__);
rc = genwqe_kill_fasync(cd, SIGIO);
if (rc > 0) {
/* give kill_timeout seconds to close file descriptors ... */
for (i = 0; (i < GENWQE_KILL_TIMEOUT) &&
genwqe_open_files(cd); i++) {
dev_info(&pci_dev->dev, " %d sec ...", i);
cond_resched();
msleep(1000);
}
/* if no open files we can safely continue, else ... */
if (!genwqe_open_files(cd))
return 0;
dev_warn(&pci_dev->dev,
"[%s] send SIGKILL and wait ...\n", __func__);
rc = genwqe_terminate(cd);
if (rc) {
/* Give kill_timout more seconds to end processes */
for (i = 0; (i < GENWQE_KILL_TIMEOUT) &&
genwqe_open_files(cd); i++) {
dev_warn(&pci_dev->dev, " %d sec ...", i);
cond_resched();
msleep(1000);
}
}
}
return 0;
}
/**
* genwqe_device_remove() - Remove genwqe's char device
* @cd: GenWQE device information
*
* This function must be called after the client devices are removed
* because it will free the major/minor number range for the genwqe
* drivers.
*
* This function must be robust enough to be called twice.
*/
int genwqe_device_remove(struct genwqe_dev *cd)
{
int rc;
struct pci_dev *pci_dev = cd->pci_dev;
if (!genwqe_device_initialized(cd))
return 1;
genwqe_inform_and_stop_processes(cd);
/*
* We currently do wait until all filedescriptors are
* closed. This leads to a problem when we abort the
* application which will decrease this reference from
* 1/unused to 0/illegal and not from 2/used 1/empty.
*/
rc = kref_read(&cd->cdev_genwqe.kobj.kref);
if (rc != 1) {
dev_err(&pci_dev->dev,
"[%s] err: cdev_genwqe...refcount=%d\n", __func__, rc);
panic("Fatal err: cannot free resources with pending references!");
}
genqwe_exit_debugfs(cd);
device_destroy(cd->class_genwqe, cd->devnum_genwqe);
cdev_del(&cd->cdev_genwqe);
unregister_chrdev_region(cd->devnum_genwqe, GENWQE_MAX_MINOR);
cd->dev = NULL;
return 0;
}