| Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * SCLP early driver |
| 3 | * |
| 4 | * Copyright IBM Corp. 2013 |
| 5 | */ |
| 6 | |
| 7 | #define KMSG_COMPONENT "sclp_early" |
| 8 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 9 | |
| 10 | #include <asm/sclp.h> |
| 11 | #include <asm/ipl.h> |
| 12 | #include "sclp_sdias.h" |
| 13 | #include "sclp.h" |
| 14 | |
| 15 | static __initdata char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE); |
| 16 | static unsigned long sclp_hsa_size; |
| 17 | |
| 18 | static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb) |
| 19 | { |
| 20 | int rc; |
| 21 | |
| 22 | do { |
| 23 | rc = sclp_cmd_sync_early(cmd, sccb); |
| 24 | } while (rc == -EBUSY); |
| 25 | |
| 26 | if (rc) |
| 27 | return -EIO; |
| 28 | if (((struct sccb_header *) sccb)->response_code != 0x0020) |
| 29 | return -EIO; |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static void __init sccb_init_eq_size(struct sdias_sccb *sccb) |
| 34 | { |
| 35 | memset(sccb, 0, sizeof(*sccb)); |
| 36 | |
| 37 | sccb->hdr.length = sizeof(*sccb); |
| 38 | sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); |
| 39 | sccb->evbuf.hdr.type = EVTYP_SDIAS; |
| 40 | sccb->evbuf.event_qual = SDIAS_EQ_SIZE; |
| 41 | sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; |
| 42 | sccb->evbuf.event_id = 4712; |
| 43 | sccb->evbuf.dbs = 1; |
| 44 | } |
| 45 | |
| 46 | static int __init sclp_set_event_mask(unsigned long receive_mask, |
| 47 | unsigned long send_mask) |
| 48 | { |
| 49 | struct init_sccb *sccb = (void *) &sccb_early; |
| 50 | |
| 51 | memset(sccb, 0, sizeof(*sccb)); |
| 52 | sccb->header.length = sizeof(*sccb); |
| 53 | sccb->mask_length = sizeof(sccb_mask_t); |
| 54 | sccb->receive_mask = receive_mask; |
| 55 | sccb->send_mask = send_mask; |
| 56 | return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); |
| 57 | } |
| 58 | |
| 59 | static long __init sclp_hsa_size_init(void) |
| 60 | { |
| 61 | struct sdias_sccb *sccb = (void *) &sccb_early; |
| 62 | |
| 63 | sccb_init_eq_size(sccb); |
| 64 | if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) |
| 65 | return -EIO; |
| 66 | if (sccb->evbuf.blk_cnt != 0) |
| 67 | return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static long __init sclp_hsa_copy_wait(void) |
| 72 | { |
| 73 | struct sccb_header *sccb = (void *) &sccb_early; |
| 74 | |
| 75 | memset(sccb, 0, PAGE_SIZE); |
| 76 | sccb->length = PAGE_SIZE; |
| 77 | if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb)) |
| 78 | return -EIO; |
| 79 | return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE; |
| 80 | } |
| 81 | |
| 82 | unsigned long sclp_get_hsa_size(void) |
| 83 | { |
| 84 | return sclp_hsa_size; |
| 85 | } |
| 86 | |
| 87 | void __init sclp_hsa_size_detect(void) |
| 88 | { |
| 89 | long size; |
| 90 | |
| 91 | /* First try synchronous interface (LPAR) */ |
| 92 | if (sclp_set_event_mask(0, 0x40000010)) |
| 93 | return; |
| 94 | size = sclp_hsa_size_init(); |
| 95 | if (size < 0) |
| 96 | return; |
| 97 | if (size != 0) |
| 98 | goto out; |
| 99 | /* Then try asynchronous interface (z/VM) */ |
| 100 | if (sclp_set_event_mask(0x00000010, 0x40000010)) |
| 101 | return; |
| 102 | size = sclp_hsa_size_init(); |
| 103 | if (size < 0) |
| 104 | return; |
| 105 | size = sclp_hsa_copy_wait(); |
| 106 | if (size < 0) |
| 107 | return; |
| 108 | out: |
| 109 | sclp_set_event_mask(0, 0); |
| 110 | sclp_hsa_size = size; |
| 111 | } |