diff options
Diffstat (limited to 'drivers/s390/char/sclp_pci.c')
| -rw-r--r-- | drivers/s390/char/sclp_pci.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_pci.c b/drivers/s390/char/sclp_pci.c new file mode 100644 index 000000000..a3e5a5fb0 --- /dev/null +++ b/drivers/s390/char/sclp_pci.c @@ -0,0 +1,200 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCI I/O adapter configuration related functions. + * + * Copyright IBM Corp. 2016 + */ +#define KMSG_COMPONENT "sclp_cmd" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/completion.h> +#include <linux/export.h> +#include <linux/mutex.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/err.h> + +#include <asm/sclp.h> + +#include "sclp.h" + +#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001 +#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001 + +#define SCLP_ATYPE_PCI 2 + +#define SCLP_ERRNOTIFY_AQ_RESET 0 +#define SCLP_ERRNOTIFY_AQ_REPAIR 1 +#define SCLP_ERRNOTIFY_AQ_INFO_LOG 2 + +static DEFINE_MUTEX(sclp_pci_mutex); +static struct sclp_register sclp_pci_event = { + .send_mask = EVTYP_ERRNOTIFY_MASK, +}; + +struct err_notify_evbuf { + struct evbuf_header header; + u8 action; + u8 atype; + u32 fh; + u32 fid; + u8 data[]; +} __packed; + +struct err_notify_sccb { + struct sccb_header header; + struct err_notify_evbuf evbuf; +} __packed; + +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_ATYPE_PCI; + sccb->aid = fid; + rc = sclp_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); + +static void sclp_pci_callback(struct sclp_req *req, void *data) +{ + struct completion *completion = data; + + complete(completion); +} + +static int sclp_pci_check_report(struct zpci_report_error_header *report) +{ + if (report->version != 1) + return -EINVAL; + + switch (report->action) { + case SCLP_ERRNOTIFY_AQ_RESET: + case SCLP_ERRNOTIFY_AQ_REPAIR: + case SCLP_ERRNOTIFY_AQ_INFO_LOG: + break; + default: + return -EINVAL; + } + + if (report->length > (PAGE_SIZE - sizeof(struct err_notify_sccb))) + return -EINVAL; + + return 0; +} + +int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid) +{ + DECLARE_COMPLETION_ONSTACK(completion); + struct err_notify_sccb *sccb; + struct sclp_req req; + int ret; + + ret = sclp_pci_check_report(report); + if (ret) + return ret; + + mutex_lock(&sclp_pci_mutex); + ret = sclp_register(&sclp_pci_event); + if (ret) + goto out_unlock; + + if (!(sclp_pci_event.sclp_receive_mask & EVTYP_ERRNOTIFY_MASK)) { + ret = -EOPNOTSUPP; + goto out_unregister; + } + + sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) { + ret = -ENOMEM; + goto out_unregister; + } + + memset(&req, 0, sizeof(req)); + req.callback_data = &completion; + req.callback = sclp_pci_callback; + req.command = SCLP_CMDW_WRITE_EVENT_DATA; + req.status = SCLP_REQ_FILLED; + req.sccb = sccb; + + sccb->evbuf.header.length = sizeof(sccb->evbuf) + report->length; + sccb->evbuf.header.type = EVTYP_ERRNOTIFY; + sccb->header.length = sizeof(sccb->header) + sccb->evbuf.header.length; + + sccb->evbuf.action = report->action; + sccb->evbuf.atype = SCLP_ATYPE_PCI; + sccb->evbuf.fh = fh; + sccb->evbuf.fid = fid; + + memcpy(sccb->evbuf.data, report->data, report->length); + + ret = sclp_add_request(&req); + if (ret) + goto out_free_req; + + wait_for_completion(&completion); + if (req.status != SCLP_REQ_DONE) { + pr_warn("request failed (status=0x%02x)\n", + req.status); + ret = -EIO; + goto out_free_req; + } + + if (sccb->header.response_code != 0x0020) { + pr_warn("request failed with response code 0x%x\n", + sccb->header.response_code); + ret = -EIO; + } + +out_free_req: + free_page((unsigned long) sccb); +out_unregister: + sclp_unregister(&sclp_pci_event); +out_unlock: + mutex_unlock(&sclp_pci_mutex); + return ret; +} |