240 lines
6.2 KiB
C
240 lines
6.2 KiB
C
/*
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* DIAGNOSE X'2C4' instruction based HMC FTP services, useable on z/VM
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*
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* Copyright IBM Corp. 2013
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* Author(s): Ralf Hoppe (rhoppe@de.ibm.com)
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*
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*/
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#define KMSG_COMPONENT "hmcdrv"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/irq.h>
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#include <linux/wait.h>
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#include <linux/string.h>
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#include <asm/ctl_reg.h>
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#include <asm/diag.h>
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#include "hmcdrv_ftp.h"
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#include "diag_ftp.h"
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/* DIAGNOSE X'2C4' return codes in Ry */
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#define DIAG_FTP_RET_OK 0 /* HMC FTP started successfully */
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#define DIAG_FTP_RET_EBUSY 4 /* HMC FTP service currently busy */
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#define DIAG_FTP_RET_EIO 8 /* HMC FTP service I/O error */
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/* and an artificial extension */
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#define DIAG_FTP_RET_EPERM 2 /* HMC FTP service privilege error */
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/* FTP service status codes (after INTR at guest real location 133) */
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#define DIAG_FTP_STAT_OK 0U /* request completed successfully */
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#define DIAG_FTP_STAT_PGCC 4U /* program check condition */
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#define DIAG_FTP_STAT_PGIOE 8U /* paging I/O error */
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#define DIAG_FTP_STAT_TIMEOUT 12U /* timeout */
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#define DIAG_FTP_STAT_EBASE 16U /* base of error codes from SCLP */
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#define DIAG_FTP_STAT_LDFAIL (DIAG_FTP_STAT_EBASE + 1U) /* failed */
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#define DIAG_FTP_STAT_LDNPERM (DIAG_FTP_STAT_EBASE + 2U) /* not allowed */
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#define DIAG_FTP_STAT_LDRUNS (DIAG_FTP_STAT_EBASE + 3U) /* runs */
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#define DIAG_FTP_STAT_LDNRUNS (DIAG_FTP_STAT_EBASE + 4U) /* not runs */
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/**
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* struct diag_ftp_ldfpl - load file FTP parameter list (LDFPL)
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* @bufaddr: real buffer address (at 4k boundary)
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* @buflen: length of buffer
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* @offset: dir/file offset
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* @intparm: interruption parameter (unused)
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* @transferred: bytes transferred
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* @fsize: file size, filled on GET
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* @failaddr: failing address
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* @spare: padding
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* @fident: file name - ASCII
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*/
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struct diag_ftp_ldfpl {
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u64 bufaddr;
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u64 buflen;
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u64 offset;
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u64 intparm;
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u64 transferred;
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u64 fsize;
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u64 failaddr;
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u64 spare;
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u8 fident[HMCDRV_FTP_FIDENT_MAX];
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} __packed;
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static DECLARE_COMPLETION(diag_ftp_rx_complete);
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static int diag_ftp_subcode;
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/**
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* diag_ftp_handler() - FTP services IRQ handler
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* @extirq: external interrupt (sub-) code
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* @param32: 32-bit interruption parameter from &struct diag_ftp_ldfpl
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* @param64: unused (for 64-bit interrupt parameters)
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*/
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static void diag_ftp_handler(struct ext_code extirq,
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unsigned int param32,
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unsigned long param64)
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{
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if ((extirq.subcode >> 8) != 8)
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return; /* not a FTP services sub-code */
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inc_irq_stat(IRQEXT_FTP);
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diag_ftp_subcode = extirq.subcode & 0xffU;
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complete(&diag_ftp_rx_complete);
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}
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/**
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* diag_ftp_2c4() - DIAGNOSE X'2C4' service call
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* @fpl: pointer to prepared LDFPL
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* @cmd: FTP command to be executed
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*
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* Performs a DIAGNOSE X'2C4' call with (input/output) FTP parameter list
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* @fpl and FTP function code @cmd. In case of an error the function does
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* nothing and returns an (negative) error code.
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*
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* Notes:
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* 1. This function only initiates a transfer, so the caller must wait
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* for completion (asynchronous execution).
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* 2. The FTP parameter list @fpl must be aligned to a double-word boundary.
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* 3. fpl->bufaddr must be a real address, 4k aligned
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*/
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static int diag_ftp_2c4(struct diag_ftp_ldfpl *fpl,
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enum hmcdrv_ftp_cmdid cmd)
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{
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int rc;
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diag_stat_inc(DIAG_STAT_X2C4);
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asm volatile(
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" diag %[addr],%[cmd],0x2c4\n"
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"0: j 2f\n"
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"1: la %[rc],%[err]\n"
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"2:\n"
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EX_TABLE(0b, 1b)
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: [rc] "=d" (rc), "+m" (*fpl)
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: [cmd] "0" (cmd), [addr] "d" (virt_to_phys(fpl)),
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[err] "i" (DIAG_FTP_RET_EPERM)
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: "cc");
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switch (rc) {
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case DIAG_FTP_RET_OK:
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return 0;
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case DIAG_FTP_RET_EBUSY:
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return -EBUSY;
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case DIAG_FTP_RET_EPERM:
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return -EPERM;
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case DIAG_FTP_RET_EIO:
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default:
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return -EIO;
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}
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}
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/**
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* diag_ftp_cmd() - executes a DIAG X'2C4' FTP command, targeting a HMC
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* @ftp: pointer to FTP command specification
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* @fsize: return of file size (or NULL if undesirable)
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*
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* Attention: Notice that this function is not reentrant - so the caller
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* must ensure locking.
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*
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* Return: number of bytes read/written or a (negative) error code
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*/
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ssize_t diag_ftp_cmd(const struct hmcdrv_ftp_cmdspec *ftp, size_t *fsize)
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{
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struct diag_ftp_ldfpl *ldfpl;
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ssize_t len;
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#ifdef DEBUG
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unsigned long start_jiffies;
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pr_debug("starting DIAG X'2C4' on '%s', requesting %zd bytes\n",
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ftp->fname, ftp->len);
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start_jiffies = jiffies;
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#endif
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init_completion(&diag_ftp_rx_complete);
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ldfpl = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!ldfpl) {
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len = -ENOMEM;
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goto out;
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}
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len = strlcpy(ldfpl->fident, ftp->fname, sizeof(ldfpl->fident));
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if (len >= HMCDRV_FTP_FIDENT_MAX) {
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len = -EINVAL;
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goto out_free;
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}
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ldfpl->transferred = 0;
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ldfpl->fsize = 0;
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ldfpl->offset = ftp->ofs;
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ldfpl->buflen = ftp->len;
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ldfpl->bufaddr = virt_to_phys(ftp->buf);
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len = diag_ftp_2c4(ldfpl, ftp->id);
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if (len)
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goto out_free;
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/*
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* There is no way to cancel the running diag X'2C4', the code
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* needs to wait unconditionally until the transfer is complete.
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*/
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wait_for_completion(&diag_ftp_rx_complete);
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#ifdef DEBUG
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pr_debug("completed DIAG X'2C4' after %lu ms\n",
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(jiffies - start_jiffies) * 1000 / HZ);
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pr_debug("status of DIAG X'2C4' is %u, with %lld/%lld bytes\n",
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diag_ftp_subcode, ldfpl->transferred, ldfpl->fsize);
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#endif
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switch (diag_ftp_subcode) {
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case DIAG_FTP_STAT_OK: /* success */
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len = ldfpl->transferred;
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if (fsize)
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*fsize = ldfpl->fsize;
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break;
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case DIAG_FTP_STAT_LDNPERM:
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len = -EPERM;
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break;
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case DIAG_FTP_STAT_LDRUNS:
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len = -EBUSY;
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break;
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case DIAG_FTP_STAT_LDFAIL:
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len = -ENOENT; /* no such file or media */
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break;
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default:
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len = -EIO;
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break;
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}
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out_free:
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free_page((unsigned long) ldfpl);
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out:
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return len;
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}
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/**
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* diag_ftp_startup() - startup of FTP services, when running on z/VM
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*
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* Return: 0 on success, else an (negative) error code
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*/
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int diag_ftp_startup(void)
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{
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int rc;
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rc = register_external_irq(EXT_IRQ_CP_SERVICE, diag_ftp_handler);
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if (rc)
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return rc;
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irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
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return 0;
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}
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/**
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* diag_ftp_shutdown() - shutdown of FTP services, when running on z/VM
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*/
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void diag_ftp_shutdown(void)
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{
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irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
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unregister_external_irq(EXT_IRQ_CP_SERVICE, diag_ftp_handler);
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}
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