Commit 988b86e6 authored by Martin Schwidefsky's avatar Martin Schwidefsky

s390/pci: add ioctl interface for CLP

Provide a user space interface to issue call logical-processor instructions.
Only selected CLP commands are allowed, enough to get the full overview of
the installed PCI functions.
Reviewed-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent baebc70a
......@@ -4,14 +4,23 @@
/* CLP common request & response block size */
#define CLP_BLK_SIZE PAGE_SIZE
#define CLP_LPS_BASE 0
#define CLP_LPS_PCI 2
struct clp_req_hdr {
u16 len;
u16 cmd;
u32 fmt : 4;
u32 reserved1 : 28;
u64 reserved2;
} __packed;
struct clp_rsp_hdr {
u16 len;
u16 rsp;
u32 fmt : 4;
u32 reserved1 : 28;
u64 reserved2;
} __packed;
/* CLP Response Codes */
......@@ -25,4 +34,22 @@ struct clp_rsp_hdr {
#define CLP_RC_NODATA 0x0080 /* No data available */
#define CLP_RC_FC_UNKNOWN 0x0100 /* Function code not recognized */
/* Store logical-processor characteristics request */
struct clp_req_slpc {
struct clp_req_hdr hdr;
} __packed;
struct clp_rsp_slpc {
struct clp_rsp_hdr hdr;
u32 reserved2[4];
u32 lpif[8];
u32 reserved3[8];
u32 lpic[8];
} __packed;
struct clp_req_rsp_slpc {
struct clp_req_slpc request;
struct clp_rsp_slpc response;
} __packed;
#endif
......@@ -49,9 +49,6 @@ struct clp_fh_list_entry {
/* List PCI functions request */
struct clp_req_list_pci {
struct clp_req_hdr hdr;
u32 fmt : 4; /* cmd request block format */
u32 : 28;
u64 reserved1;
u64 resume_token;
u64 reserved2;
} __packed;
......@@ -59,9 +56,6 @@ struct clp_req_list_pci {
/* List PCI functions response */
struct clp_rsp_list_pci {
struct clp_rsp_hdr hdr;
u32 fmt : 4; /* cmd request block format */
u32 : 28;
u64 reserved1;
u64 resume_token;
u32 reserved2;
u16 max_fn;
......@@ -73,9 +67,6 @@ struct clp_rsp_list_pci {
/* Query PCI function request */
struct clp_req_query_pci {
struct clp_req_hdr hdr;
u32 fmt : 4; /* cmd request block format */
u32 : 28;
u64 reserved1;
u32 fh; /* function handle */
u32 reserved2;
u64 reserved3;
......@@ -84,9 +75,6 @@ struct clp_req_query_pci {
/* Query PCI function response */
struct clp_rsp_query_pci {
struct clp_rsp_hdr hdr;
u32 fmt : 4; /* cmd request block format */
u32 : 28;
u64 : 64;
u16 vfn; /* virtual fn number */
u16 : 7;
u16 util_str_avail : 1; /* utility string available? */
......@@ -108,21 +96,15 @@ struct clp_rsp_query_pci {
/* Query PCI function group request */
struct clp_req_query_pci_grp {
struct clp_req_hdr hdr;
u32 fmt : 4; /* cmd request block format */
u32 : 28;
u64 reserved1;
u32 : 24;
u32 reserved2 : 24;
u32 pfgid : 8; /* function group id */
u32 reserved2;
u64 reserved3;
u32 reserved3;
u64 reserved4;
} __packed;
/* Query PCI function group response */
struct clp_rsp_query_pci_grp {
struct clp_rsp_hdr hdr;
u32 fmt : 4; /* cmd request block format */
u32 : 28;
u64 reserved1;
u16 : 4;
u16 noi : 12; /* number of interrupts */
u8 version;
......@@ -141,9 +123,6 @@ struct clp_rsp_query_pci_grp {
/* Set PCI function request */
struct clp_req_set_pci {
struct clp_req_hdr hdr;
u32 fmt : 4; /* cmd request block format */
u32 : 28;
u64 reserved1;
u32 fh; /* function handle */
u16 reserved2;
u8 oc; /* operation controls */
......@@ -154,9 +133,6 @@ struct clp_req_set_pci {
/* Set PCI function response */
struct clp_rsp_set_pci {
struct clp_rsp_hdr hdr;
u32 fmt : 4; /* cmd request block format */
u32 : 28;
u64 reserved1;
u32 fh; /* function handle */
u32 reserved3;
u64 reserved4;
......
/*
* ioctl interface for /dev/clp
*
* Copyright IBM Corp. 2016
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#ifndef _ASM_CLP_H
#define _ASM_CLP_H
#include <linux/types.h>
#include <linux/ioctl.h>
struct clp_req {
unsigned int c : 1;
unsigned int r : 1;
unsigned int lps : 6;
unsigned int cmd : 8;
unsigned int : 16;
unsigned int reserved;
__u64 data_p;
};
#define CLP_IOCTL_MAGIC 'c'
#define CLP_SYNC _IOWR(CLP_IOCTL_MAGIC, 0xC1, struct clp_req)
#endif
......@@ -8,13 +8,19 @@
#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/uaccess.h>
#include <asm/pci_debug.h>
#include <asm/pci_clp.h>
#include <asm/compat.h>
#include <asm/clp.h>
#include <uapi/asm/clp.h>
static inline void zpci_err_clp(unsigned int rsp, int rc)
{
......@@ -27,21 +33,43 @@ static inline void zpci_err_clp(unsigned int rsp, int rc)
}
/*
* Call Logical Processor
* Retry logic is handled by the caller.
* Call Logical Processor with c=1, lps=0 and command 1
* to get the bit mask of installed logical processors
*/
static inline u8 clp_instr(void *data)
static inline int clp_get_ilp(unsigned long *ilp)
{
unsigned long mask;
int cc = 3;
asm volatile (
" .insn rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
"1:\n"
EX_TABLE(0b, 1b)
: [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
: "cc");
*ilp = mask;
return cc;
}
/*
* Call Logical Processor with c=0, the give constant lps and an lpcb request.
*/
static inline int clp_req(void *data, unsigned int lps)
{
struct { u8 _[CLP_BLK_SIZE]; } *req = data;
u64 ignored;
u8 cc;
int cc = 3;
asm volatile (
" .insn rrf,0xb9a00000,%[ign],%[req],0x0,0x2\n"
" ipm %[cc]\n"
" .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
: [cc] "=d" (cc), [ign] "=d" (ignored), "+m" (*req)
: [req] "a" (req)
"1:\n"
EX_TABLE(0b, 1b)
: [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
: [req] "a" (req), [lps] "i" (lps)
: "cc");
return cc;
}
......@@ -90,7 +118,7 @@ static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
rrb->response.hdr.len = sizeof(rrb->response);
rrb->request.pfgid = pfgid;
rc = clp_instr(rrb);
rc = clp_req(rrb, CLP_LPS_PCI);
if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
clp_store_query_pci_fngrp(zdev, &rrb->response);
else {
......@@ -143,7 +171,7 @@ static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
rrb->response.hdr.len = sizeof(rrb->response);
rrb->request.fh = fh;
rc = clp_instr(rrb);
rc = clp_req(rrb, CLP_LPS_PCI);
if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
rc = clp_store_query_pci_fn(zdev, &rrb->response);
if (rc)
......@@ -214,7 +242,7 @@ static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
rrb->request.oc = command;
rrb->request.ndas = nr_dma_as;
rc = clp_instr(rrb);
rc = clp_req(rrb, CLP_LPS_PCI);
if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
retries--;
if (retries < 0)
......@@ -280,7 +308,7 @@ static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
rrb->request.resume_token = resume_token;
/* Get PCI function handle list */
rc = clp_instr(rrb);
rc = clp_req(rrb, CLP_LPS_PCI);
if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
zpci_err("List PCI FN:\n");
zpci_err_clp(rrb->response.hdr.rsp, rc);
......@@ -391,3 +419,198 @@ int clp_rescan_pci_devices_simple(void)
clp_free_block(rrb);
return rc;
}
static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
{
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
lpcb->response.hdr.len > limit)
return -EINVAL;
return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
}
static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
{
switch (lpcb->cmd) {
case 0x0001: /* store logical-processor characteristics */
return clp_base_slpc(req, (void *) lpcb);
default:
return -EINVAL;
}
}
static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
{
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
lpcb->response.hdr.len > limit)
return -EINVAL;
return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
}
static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
{
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
lpcb->response.hdr.len > limit)
return -EINVAL;
if (lpcb->request.reserved2 != 0)
return -EINVAL;
return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
}
static int clp_pci_query(struct clp_req *req,
struct clp_req_rsp_query_pci *lpcb)
{
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
lpcb->response.hdr.len > limit)
return -EINVAL;
if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
return -EINVAL;
return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
}
static int clp_pci_query_grp(struct clp_req *req,
struct clp_req_rsp_query_pci_grp *lpcb)
{
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
lpcb->response.hdr.len > limit)
return -EINVAL;
if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
lpcb->request.reserved4 != 0)
return -EINVAL;
return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
}
static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
{
switch (lpcb->cmd) {
case 0x0001: /* store logical-processor characteristics */
return clp_pci_slpc(req, (void *) lpcb);
case 0x0002: /* list PCI functions */
return clp_pci_list(req, (void *) lpcb);
case 0x0003: /* query PCI function */
return clp_pci_query(req, (void *) lpcb);
case 0x0004: /* query PCI function group */
return clp_pci_query_grp(req, (void *) lpcb);
default:
return -EINVAL;
}
}
static int clp_normal_command(struct clp_req *req)
{
struct clp_req_hdr *lpcb;
void __user *uptr;
int rc;
rc = -EINVAL;
if (req->lps != 0 && req->lps != 2)
goto out;
rc = -ENOMEM;
lpcb = clp_alloc_block(GFP_KERNEL);
if (!lpcb)
goto out;
rc = -EFAULT;
uptr = (void __force __user *)(unsigned long) req->data_p;
if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
goto out_free;
rc = -EINVAL;
if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
goto out_free;
switch (req->lps) {
case 0:
rc = clp_base_command(req, lpcb);
break;
case 2:
rc = clp_pci_command(req, lpcb);
break;
}
if (rc)
goto out_free;
rc = -EFAULT;
if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
goto out_free;
rc = 0;
out_free:
clp_free_block(lpcb);
out:
return rc;
}
static int clp_immediate_command(struct clp_req *req)
{
void __user *uptr;
unsigned long ilp;
int exists;
if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
return -EINVAL;
uptr = (void __force __user *)(unsigned long) req->data_p;
if (req->cmd == 0) {
/* Command code 0: test for a specific processor */
exists = test_bit_inv(req->lps, &ilp);
return put_user(exists, (int __user *) uptr);
}
/* Command code 1: return bit mask of installed processors */
return put_user(ilp, (unsigned long __user *) uptr);
}
static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
struct clp_req req;
void __user *argp;
if (cmd != CLP_SYNC)
return -EINVAL;
argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
if (copy_from_user(&req, argp, sizeof(req)))
return -EFAULT;
if (req.r != 0)
return -EINVAL;
return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
}
static int clp_misc_release(struct inode *inode, struct file *filp)
{
return 0;
}
static const struct file_operations clp_misc_fops = {
.owner = THIS_MODULE,
.open = nonseekable_open,
.release = clp_misc_release,
.unlocked_ioctl = clp_misc_ioctl,
.compat_ioctl = clp_misc_ioctl,
.llseek = no_llseek,
};
static struct miscdevice clp_misc_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "clp",
.fops = &clp_misc_fops,
};
static int __init clp_misc_init(void)
{
return misc_register(&clp_misc_device);
}
device_initcall(clp_misc_init);
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