From: Michael Holzheu Date: Thu, 6 Jun 2013 07:52:08 +0000 (+0200) Subject: s390/sclp: Add SCLP character device driver X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d475f942b1dd6a897dac3ad4ed98d6994b275378;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git s390/sclp: Add SCLP character device driver Add a character misc device "sclp_ctl" that allows to run SCCBs from user space using the SCLP_CTL_SCCB ioctl. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky --- diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt index 237acab169dd..2a5f0e14efa3 100644 --- a/Documentation/ioctl/ioctl-number.txt +++ b/Documentation/ioctl/ioctl-number.txt @@ -72,6 +72,7 @@ Code Seq#(hex) Include File Comments 0x06 all linux/lp.h 0x09 all linux/raid/md_u.h 0x10 00-0F drivers/char/s390/vmcp.h +0x10 10-1F arch/s390/include/uapi/sclp_ctl.h 0x12 all linux/fs.h linux/blkpg.h 0x1b all InfiniBand Subsystem diff --git a/arch/s390/include/uapi/asm/Kbuild b/arch/s390/include/uapi/asm/Kbuild index 9ccd1905bdad..6a9a9eb645f5 100644 --- a/arch/s390/include/uapi/asm/Kbuild +++ b/arch/s390/include/uapi/asm/Kbuild @@ -35,6 +35,7 @@ header-y += siginfo.h header-y += signal.h header-y += socket.h header-y += sockios.h +header-y += sclp_ctl.h header-y += stat.h header-y += statfs.h header-y += swab.h diff --git a/arch/s390/include/uapi/asm/sclp_ctl.h b/arch/s390/include/uapi/asm/sclp_ctl.h new file mode 100644 index 000000000000..f2818613ee41 --- /dev/null +++ b/arch/s390/include/uapi/asm/sclp_ctl.h @@ -0,0 +1,24 @@ +/* + * IOCTL interface for SCLP + * + * Copyright IBM Corp. 2012 + * + * Author: Michael Holzheu + */ + +#ifndef _ASM_SCLP_CTL_H +#define _ASM_SCLP_CTL_H + +#include + +struct sclp_ctl_sccb { + __u32 cmdw; + __u64 sccb; +} __attribute__((packed)); + +#define SCLP_CTL_IOCTL_MAGIC 0x10 + +#define SCLP_CTL_SCCB \ + _IOWR(SCLP_CTL_IOCTL_MAGIC, 0x10, struct sclp_ctl_sccb) + +#endif diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile index f3c325207445..17821a026c9c 100644 --- a/drivers/s390/char/Makefile +++ b/drivers/s390/char/Makefile @@ -3,7 +3,7 @@ # obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \ - sclp_cmd.o sclp_config.o sclp_cpi_sys.o sclp_ocf.o + sclp_cmd.o sclp_config.o sclp_cpi_sys.o sclp_ocf.o sclp_ctl.o obj-$(CONFIG_TN3270) += raw3270.o obj-$(CONFIG_TN3270_CONSOLE) += con3270.o diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index a77febeead1f..97319d692b04 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -148,14 +148,19 @@ static int sclp_init(void); int sclp_service_call(sclp_cmdw_t command, void *sccb) { - int cc; + int cc = 4; /* Initialize for program check handling */ asm volatile( - " .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */ - " ipm %0\n" - " srl %0,28" - : "=&d" (cc) : "d" (command), "a" (__pa(sccb)) + "0: .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */ + "1: ipm %0\n" + " srl %0,28\n" + "2:\n" + EX_TABLE(0b, 2b) + EX_TABLE(1b, 2b) + : "+&d" (cc) : "d" (command), "a" (__pa(sccb)) : "cc", "memory"); + if (cc == 4) + return -EINVAL; if (cc == 3) return -EIO; if (cc == 2) diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h index e11383f5d3d2..40d1406289ed 100644 --- a/drivers/s390/char/sclp.h +++ b/drivers/s390/char/sclp.h @@ -171,6 +171,7 @@ int sclp_remove_processed(struct sccb_header *sccb); int sclp_deactivate(void); int sclp_reactivate(void); int sclp_service_call(sclp_cmdw_t command, void *sccb); +int sclp_sync_request(sclp_cmdw_t command, void *sccb); int sclp_sdias_init(void); void sclp_sdias_exit(void); diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c index bf07c3a188d4..657b0348579c 100644 --- a/drivers/s390/char/sclp_cmd.c +++ b/drivers/s390/char/sclp_cmd.c @@ -195,7 +195,7 @@ static void sclp_sync_callback(struct sclp_req *req, void *data) complete(completion); } -static int do_sync_request(sclp_cmdw_t cmd, void *sccb) +int sclp_sync_request(sclp_cmdw_t cmd, void *sccb) { struct completion completion; struct sclp_req *request; @@ -270,7 +270,7 @@ int sclp_get_cpu_info(struct sclp_cpu_info *info) if (!sccb) return -ENOMEM; sccb->header.length = sizeof(*sccb); - rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); + rc = sclp_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); if (rc) goto out; if (sccb->header.response_code != 0x0010) { @@ -304,7 +304,7 @@ static int do_cpu_configure(sclp_cmdw_t cmd) if (!sccb) return -ENOMEM; sccb->header.length = sizeof(*sccb); - rc = do_sync_request(cmd, sccb); + rc = sclp_sync_request(cmd, sccb); if (rc) goto out; switch (sccb->header.response_code) { @@ -374,7 +374,7 @@ static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) return -ENOMEM; sccb->header.length = PAGE_SIZE; sccb->rn = rn; - rc = do_sync_request(cmd, sccb); + rc = sclp_sync_request(cmd, sccb); if (rc) goto out; switch (sccb->header.response_code) { @@ -429,7 +429,7 @@ static int sclp_attach_storage(u8 id) if (!sccb) return -ENOMEM; sccb->header.length = PAGE_SIZE; - rc = do_sync_request(0x00080001 | id << 8, sccb); + rc = sclp_sync_request(0x00080001 | id << 8, sccb); if (rc) goto out; switch (sccb->header.response_code) { @@ -627,7 +627,7 @@ static int __init sclp_detect_standby_memory(void) for (id = 0; id <= sclp_max_storage_id; id++) { memset(sccb, 0, PAGE_SIZE); sccb->header.length = PAGE_SIZE; - rc = do_sync_request(0x00040001 | id << 8, sccb); + rc = sclp_sync_request(0x00040001 | id << 8, sccb); if (rc) goto out; switch (sccb->header.response_code) { @@ -714,7 +714,7 @@ static int do_pci_configure(sclp_cmdw_t cmd, u32 fid) sccb->header.length = PAGE_SIZE; sccb->atype = SCLP_RECONFIG_PCI_ATPYE; sccb->aid = fid; - rc = do_sync_request(cmd, sccb); + rc = sclp_sync_request(cmd, sccb); if (rc) goto out; switch (sccb->header.response_code) { @@ -771,7 +771,7 @@ static int do_chp_configure(sclp_cmdw_t cmd) if (!sccb) return -ENOMEM; sccb->header.length = sizeof(*sccb); - rc = do_sync_request(cmd, sccb); + rc = sclp_sync_request(cmd, sccb); if (rc) goto out; switch (sccb->header.response_code) { @@ -846,7 +846,7 @@ int sclp_chp_read_info(struct sclp_chp_info *info) if (!sccb) return -ENOMEM; sccb->header.length = sizeof(*sccb); - rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); + rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); if (rc) goto out; if (sccb->header.response_code != 0x0010) { diff --git a/drivers/s390/char/sclp_ctl.c b/drivers/s390/char/sclp_ctl.c new file mode 100644 index 000000000000..abe8ef13d148 --- /dev/null +++ b/drivers/s390/char/sclp_ctl.c @@ -0,0 +1,145 @@ +/* + * IOCTL interface for SCLP + * + * Copyright IBM Corp. 2012 + * + * Author: Michael Holzheu + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" + +/* + * Supported command words + */ +static unsigned int sclp_ctl_sccb_wlist[] = { + 0x00400002, + 0x00410002, +}; + +/* + * Check if command word is supported + */ +static int sclp_ctl_cmdw_supported(unsigned int cmdw) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(sclp_ctl_sccb_wlist); i++) { + if (cmdw == sclp_ctl_sccb_wlist[i]) + return 1; + } + return 0; +} + +static void __user *u64_to_uptr(u64 value) +{ + if (is_compat_task()) + return compat_ptr(value); + else + return (void __user *)(unsigned long)value; +} + +/* + * Start SCLP request + */ +static int sclp_ctl_ioctl_sccb(void __user *user_area) +{ + struct sclp_ctl_sccb ctl_sccb; + struct sccb_header *sccb; + int rc; + + if (copy_from_user(&ctl_sccb, user_area, sizeof(ctl_sccb))) + return -EFAULT; + if (!sclp_ctl_cmdw_supported(ctl_sccb.cmdw)) + return -EOPNOTSUPP; + sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + if (copy_from_user(sccb, u64_to_uptr(ctl_sccb.sccb), sizeof(*sccb))) { + rc = -EFAULT; + goto out_free; + } + if (sccb->length > PAGE_SIZE || sccb->length < 8) + return -EINVAL; + if (copy_from_user(sccb, u64_to_uptr(ctl_sccb.sccb), sccb->length)) { + rc = -EFAULT; + goto out_free; + } + rc = sclp_sync_request(ctl_sccb.cmdw, sccb); + if (rc) + goto out_free; + if (copy_to_user(u64_to_uptr(ctl_sccb.sccb), sccb, sccb->length)) + rc = -EFAULT; +out_free: + free_page((unsigned long) sccb); + return rc; +} + +/* + * SCLP SCCB ioctl function + */ +static long sclp_ctl_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + void __user *argp; + + if (is_compat_task()) + argp = compat_ptr(arg); + else + argp = (void __user *) arg; + switch (cmd) { + case SCLP_CTL_SCCB: + return sclp_ctl_ioctl_sccb(argp); + default: /* unknown ioctl number */ + return -ENOTTY; + } +} + +/* + * File operations + */ +static const struct file_operations sclp_ctl_fops = { + .owner = THIS_MODULE, + .open = nonseekable_open, + .unlocked_ioctl = sclp_ctl_ioctl, + .compat_ioctl = sclp_ctl_ioctl, + .llseek = no_llseek, +}; + +/* + * Misc device definition + */ +static struct miscdevice sclp_ctl_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "sclp", + .fops = &sclp_ctl_fops, +}; + +/* + * Register sclp_ctl misc device + */ +static int __init sclp_ctl_init(void) +{ + return misc_register(&sclp_ctl_device); +} +module_init(sclp_ctl_init); + +/* + * Deregister sclp_ctl misc device + */ +static void __exit sclp_ctl_exit(void) +{ + misc_deregister(&sclp_ctl_device); +} +module_exit(sclp_ctl_exit);