77 строки
1.6 KiB
C
77 строки
1.6 KiB
C
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/*
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* PCI I/O adapter configuration related functions.
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*
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* Copyright IBM Corp. 2016
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*/
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#define KMSG_COMPONENT "sclp_cmd"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/completion.h>
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#include <linux/export.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <asm/sclp.h>
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#include "sclp.h"
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#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
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#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
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#define SCLP_RECONFIG_PCI_ATPYE 2
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struct pci_cfg_sccb {
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struct sccb_header header;
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u8 atype; /* adapter type */
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u8 reserved1;
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u16 reserved2;
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u32 aid; /* adapter identifier */
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} __packed;
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static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
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{
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struct pci_cfg_sccb *sccb;
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int rc;
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if (!SCLP_HAS_PCI_RECONFIG)
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return -EOPNOTSUPP;
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sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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return -ENOMEM;
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sccb->header.length = PAGE_SIZE;
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sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
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sccb->aid = fid;
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rc = sclp_sync_request(cmd, sccb);
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if (rc)
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goto out;
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switch (sccb->header.response_code) {
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case 0x0020:
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case 0x0120:
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break;
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default:
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pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
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cmd, sccb->header.response_code);
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rc = -EIO;
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break;
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}
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out:
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free_page((unsigned long) sccb);
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return rc;
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}
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int sclp_pci_configure(u32 fid)
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{
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return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
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}
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EXPORT_SYMBOL(sclp_pci_configure);
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int sclp_pci_deconfigure(u32 fid)
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{
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return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
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}
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EXPORT_SYMBOL(sclp_pci_deconfigure);
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