-/*
- * Channel measurement related functions
- */
-static ssize_t
-chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off,
- size_t count)
-{
- struct channel_path *chp;
- unsigned int size;
-
- chp = to_channelpath(container_of(kobj, struct device, kobj));
- if (!chp->cmg_chars)
- return 0;
-
- size = sizeof(struct cmg_chars);
-
- if (off > size)
- return 0;
- if (off + count > size)
- count = size - off;
- memcpy(buf, chp->cmg_chars + off, count);
- return count;
-}
-
-static struct bin_attribute chp_measurement_chars_attr = {
- .attr = {
- .name = "measurement_chars",
- .mode = S_IRUSR,
- .owner = THIS_MODULE,
- },
- .size = sizeof(struct cmg_chars),
- .read = chp_measurement_chars_read,
-};
-
-static void
-chp_measurement_copy_block(struct cmg_entry *buf,
- struct channel_subsystem *css, int chpid)
-{
- void *area;
- struct cmg_entry *entry, reference_buf;
- int idx;
-
- if (chpid < 128) {
- area = css->cub_addr1;
- idx = chpid;
- } else {
- area = css->cub_addr2;
- idx = chpid - 128;
- }
- entry = area + (idx * sizeof(struct cmg_entry));
- do {
- memcpy(buf, entry, sizeof(*entry));
- memcpy(&reference_buf, entry, sizeof(*entry));
- } while (reference_buf.values[0] != buf->values[0]);
-}
-
-static ssize_t
-chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
-{
- struct channel_path *chp;
- struct channel_subsystem *css;
- unsigned int size;
-
- chp = to_channelpath(container_of(kobj, struct device, kobj));
- css = to_css(chp->dev.parent);
-
- size = sizeof(struct cmg_entry);
-
- /* Only allow single reads. */
- if (off || count < size)
- return 0;
- chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->id);
- count = size;
- return count;
-}
-
-static struct bin_attribute chp_measurement_attr = {
- .attr = {
- .name = "measurement",
- .mode = S_IRUSR,
- .owner = THIS_MODULE,
- },
- .size = sizeof(struct cmg_entry),
- .read = chp_measurement_read,
-};
-
-static void
-chsc_remove_chp_cmg_attr(struct channel_path *chp)
-{
- sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_chars_attr);
- sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_attr);
-}
-
-static int
-chsc_add_chp_cmg_attr(struct channel_path *chp)
-{
- int ret;
-
- ret = sysfs_create_bin_file(&chp->dev.kobj,
- &chp_measurement_chars_attr);
- if (ret)
- return ret;
- ret = sysfs_create_bin_file(&chp->dev.kobj, &chp_measurement_attr);
- if (ret)
- sysfs_remove_bin_file(&chp->dev.kobj,
- &chp_measurement_chars_attr);
- return ret;
-}
-
-static void
-chsc_remove_cmg_attr(struct channel_subsystem *css)
-{
- int i;
-
- for (i = 0; i <= __MAX_CHPID; i++) {
- if (!css->chps[i])
- continue;
- chsc_remove_chp_cmg_attr(css->chps[i]);
- }
-}
-
-static int
-chsc_add_cmg_attr(struct channel_subsystem *css)
-{
- int i, ret;
-
- ret = 0;
- for (i = 0; i <= __MAX_CHPID; i++) {
- if (!css->chps[i])
- continue;
- ret = chsc_add_chp_cmg_attr(css->chps[i]);
- if (ret)
- goto cleanup;
- }
- return ret;
-cleanup:
- for (--i; i >= 0; i--) {
- if (!css->chps[i])
- continue;
- chsc_remove_chp_cmg_attr(css->chps[i]);
- }
- return ret;
-}
-
-
-static int
-__chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
-{
- struct {
- struct chsc_header request;
- u32 operation_code : 2;
- u32 : 30;
- u32 key : 4;
- u32 : 28;
- u32 zeroes1;
- u32 cub_addr1;
- u32 zeroes2;
- u32 cub_addr2;
- u32 reserved[13];
- struct chsc_header response;
- u32 status : 8;
- u32 : 4;
- u32 fmt : 4;
- u32 : 16;
- } *secm_area;
- int ret, ccode;
-
- secm_area = page;
- secm_area->request.length = 0x0050;
- secm_area->request.code = 0x0016;
-
- secm_area->key = PAGE_DEFAULT_KEY;
- secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
- secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
-
- secm_area->operation_code = enable ? 0 : 1;
-
- ccode = chsc(secm_area);
- if (ccode > 0)
- return (ccode == 3) ? -ENODEV : -EBUSY;
-
- switch (secm_area->response.code) {
- case 0x0001: /* Success. */
- ret = 0;
- break;
- case 0x0003: /* Invalid block. */
- case 0x0007: /* Invalid format. */
- case 0x0008: /* Other invalid block. */
- CIO_CRW_EVENT(2, "Error in chsc request block!\n");
- ret = -EINVAL;
- break;
- case 0x0004: /* Command not provided in model. */
- CIO_CRW_EVENT(2, "Model does not provide secm\n");
- ret = -EOPNOTSUPP;
- break;
- case 0x0102: /* cub adresses incorrect */
- CIO_CRW_EVENT(2, "Invalid addresses in chsc request block\n");
- ret = -EINVAL;
- break;
- case 0x0103: /* key error */
- CIO_CRW_EVENT(2, "Access key error in secm\n");
- ret = -EINVAL;
- break;
- case 0x0105: /* error while starting */
- CIO_CRW_EVENT(2, "Error while starting channel measurement\n");
- ret = -EIO;
- break;
- default:
- CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
- secm_area->response.code);
- ret = -EIO;
- }
- return ret;
-}
-
-int
-chsc_secm(struct channel_subsystem *css, int enable)
-{
- void *secm_area;
- int ret;
-
- secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
- if (!secm_area)
- return -ENOMEM;
-
- mutex_lock(&css->mutex);
- if (enable && !css->cm_enabled) {
- css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
- css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
- if (!css->cub_addr1 || !css->cub_addr2) {
- free_page((unsigned long)css->cub_addr1);
- free_page((unsigned long)css->cub_addr2);
- free_page((unsigned long)secm_area);
- mutex_unlock(&css->mutex);
- return -ENOMEM;
- }
- }
- ret = __chsc_do_secm(css, enable, secm_area);
- if (!ret) {
- css->cm_enabled = enable;
- if (css->cm_enabled) {
- ret = chsc_add_cmg_attr(css);
- if (ret) {
- memset(secm_area, 0, PAGE_SIZE);
- __chsc_do_secm(css, 0, secm_area);
- css->cm_enabled = 0;
- }
- } else
- chsc_remove_cmg_attr(css);
- }
- if (enable && !css->cm_enabled) {
- free_page((unsigned long)css->cub_addr1);
- free_page((unsigned long)css->cub_addr2);
- }
- mutex_unlock(&css->mutex);
- free_page((unsigned long)secm_area);
- return ret;
-}
-