diff options
Diffstat (limited to 'drivers/s390/char/sclp_cmd.c')
| -rw-r--r-- | drivers/s390/char/sclp_cmd.c | 64 |
1 files changed, 63 insertions, 1 deletions
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c index 0dfa88a30118..c44d13f607bc 100644 --- a/drivers/s390/char/sclp_cmd.c +++ b/drivers/s390/char/sclp_cmd.c @@ -1,5 +1,5 @@ /* - * Copyright IBM Corp. 2007, 2009 + * Copyright IBM Corp. 2007,2012 * * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> @@ -12,6 +12,7 @@ #include <linux/init.h> #include <linux/errno.h> #include <linux/err.h> +#include <linux/export.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/mm.h> @@ -701,6 +702,67 @@ __initcall(sclp_detect_standby_memory); #endif /* CONFIG_MEMORY_HOTPLUG */ /* + * PCI I/O adapter configuration related functions. + */ +#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001 +#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001 + +#define SCLP_RECONFIG_PCI_ATPYE 2 + +struct pci_cfg_sccb { + struct sccb_header header; + u8 atype; /* adapter type */ + u8 reserved1; + u16 reserved2; + u32 aid; /* adapter identifier */ +} __packed; + +static int do_pci_configure(sclp_cmdw_t cmd, u32 fid) +{ + struct pci_cfg_sccb *sccb; + int rc; + + if (!SCLP_HAS_PCI_RECONFIG) + return -EOPNOTSUPP; + + sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + + sccb->header.length = PAGE_SIZE; + sccb->atype = SCLP_RECONFIG_PCI_ATPYE; + sccb->aid = fid; + rc = do_sync_request(cmd, sccb); + if (rc) + goto out; + switch (sccb->header.response_code) { + case 0x0020: + case 0x0120: + break; + default: + pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n", + cmd, sccb->header.response_code); + rc = -EIO; + break; + } +out: + free_page((unsigned long) sccb); + return rc; +} + +int sclp_pci_configure(u32 fid) +{ + return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid); +} +EXPORT_SYMBOL(sclp_pci_configure); + +int sclp_pci_deconfigure(u32 fid) +{ + return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid); +} +EXPORT_SYMBOL(sclp_pci_deconfigure); + +/* * Channel path configuration related functions. */ |