Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e450992d13ffaec6dde4bbbd308b834ae9fc3708
Commit:     e450992d13ffaec6dde4bbbd308b834ae9fc3708
Parent:     13077d80286205e02eebe1c2786a914a4bbd2588
Author:     David S. Miller <[EMAIL PROTECTED]>
AuthorDate: Wed Jul 11 18:51:31 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 04:04:20 2007 -0700

    [SPARC64]: Initial domain-services driver.
    
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 arch/sparc64/kernel/Makefile |    2 +-
 arch/sparc64/kernel/ds.c     |  654 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 655 insertions(+), 1 deletions(-)

diff --git a/arch/sparc64/kernel/Makefile b/arch/sparc64/kernel/Makefile
index 719ab23..70e6c50 100644
--- a/arch/sparc64/kernel/Makefile
+++ b/arch/sparc64/kernel/Makefile
@@ -26,7 +26,7 @@ obj-$(CONFIG_MODULES) += module.o
 obj-$(CONFIG_US3_FREQ) += us3_cpufreq.o
 obj-$(CONFIG_US2E_FREQ) += us2e_cpufreq.o
 obj-$(CONFIG_KPROBES) += kprobes.o
-obj-$(CONFIG_SUN_LDOMS) += ldc.o vio.o viohs.o
+obj-$(CONFIG_SUN_LDOMS) += ldc.o vio.o viohs.o ds.o
 obj-$(CONFIG_AUDIT) += audit.o
 obj-$(CONFIG_AUDIT)$(CONFIG_SPARC32_COMPAT) += compat_audit.o
 obj-y += $(obj-yy)
diff --git a/arch/sparc64/kernel/ds.c b/arch/sparc64/kernel/ds.c
new file mode 100644
index 0000000..22517df
--- /dev/null
+++ b/arch/sparc64/kernel/ds.c
@@ -0,0 +1,654 @@
+/* ds.c: Domain Services driver for Logical Domains
+ *
+ * Copyright (C) 2007 David S. Miller <[EMAIL PROTECTED]>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+
+#include <asm/ldc.h>
+#include <asm/vio.h>
+#include <asm/power.h>
+
+#define DRV_MODULE_NAME                "ds"
+#define PFX DRV_MODULE_NAME    ": "
+#define DRV_MODULE_VERSION     "1.0"
+#define DRV_MODULE_RELDATE     "Jul 11, 2007"
+
+static char version[] __devinitdata =
+       DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+MODULE_AUTHOR("David S. Miller ([EMAIL PROTECTED])");
+MODULE_DESCRIPTION("Sun LDOM domain services driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_MODULE_VERSION);
+
+struct ds_msg_tag {
+       __u32                   type;
+#define DS_INIT_REQ            0x00
+#define DS_INIT_ACK            0x01
+#define DS_INIT_NACK           0x02
+#define DS_REG_REQ             0x03
+#define DS_REG_ACK             0x04
+#define DS_REG_NACK            0x05
+#define DS_UNREG_REQ           0x06
+#define DS_UNREG_ACK           0x07
+#define DS_UNREG_NACK          0x08
+#define DS_DATA                        0x09
+#define DS_NACK                        0x0a
+
+       __u32                   len;
+};
+
+/* Result codes */
+#define DS_OK                  0x00
+#define DS_REG_VER_NACK                0x01
+#define DS_REG_DUP             0x02
+#define DS_INV_HDL             0x03
+#define DS_TYPE_UNKNOWN                0x04
+
+struct ds_version {
+       __u16                   major;
+       __u16                   minor;
+};
+
+struct ds_ver_req {
+       struct ds_msg_tag       tag;
+       struct ds_version       ver;
+};
+
+struct ds_ver_ack {
+       struct ds_msg_tag       tag;
+       __u16                   minor;
+};
+
+struct ds_ver_nack {
+       struct ds_msg_tag       tag;
+       __u16                   major;
+};
+
+struct ds_reg_req {
+       struct ds_msg_tag       tag;
+       __u64                   handle;
+       __u16                   major;
+       __u16                   minor;
+       char                    svc_id[0];
+};
+
+struct ds_reg_ack {
+       struct ds_msg_tag       tag;
+       __u64                   handle;
+       __u16                   minor;
+};
+
+struct ds_reg_nack {
+       struct ds_msg_tag       tag;
+       __u64                   handle;
+       __u16                   major;
+};
+
+struct ds_unreg_req {
+       struct ds_msg_tag       tag;
+       __u64                   handle;
+};
+
+struct ds_unreg_ack {
+       struct ds_msg_tag       tag;
+       __u64                   handle;
+};
+
+struct ds_unreg_nack {
+       struct ds_msg_tag       tag;
+       __u64                   handle;
+};
+
+struct ds_data {
+       struct ds_msg_tag       tag;
+       __u64                   handle;
+};
+
+struct ds_data_nack {
+       struct ds_msg_tag       tag;
+       __u64                   handle;
+       __u64                   result;
+};
+
+struct ds_cap_state {
+       __u64                   handle;
+
+       void                    (*data)(struct ldc_channel *lp,
+                                       struct ds_cap_state *dp,
+                                       void *buf, int len);
+
+       const char              *service_id;
+
+       u8                      state;
+#define CAP_STATE_UNKNOWN      0x00
+#define CAP_STATE_REG_SENT     0x01
+#define CAP_STATE_REGISTERED   0x02
+};
+
+static int ds_send(struct ldc_channel *lp, void *data, int len)
+{
+       int err, limit = 1000;
+
+       err = -EINVAL;
+       while (limit-- > 0) {
+               err = ldc_write(lp, data, len);
+               if (!err || (err != -EAGAIN))
+                       break;
+               udelay(1);
+       }
+
+       return err;
+}
+
+struct ds_md_update_req {
+       __u64                           req_num;
+};
+
+struct ds_md_update_res {
+       __u64                           req_num;
+       __u32                           result;
+};
+
+static void md_update_data(struct ldc_channel *lp,
+                          struct ds_cap_state *dp,
+                          void *buf, int len)
+{
+       struct ds_data *dpkt = buf;
+       struct ds_md_update_req *rp;
+       struct {
+               struct ds_data          data;
+               struct ds_md_update_res res;
+       } pkt;
+
+       rp = (struct ds_md_update_req *) (dpkt + 1);
+
+       printk(KERN_ERR PFX "MD update REQ [%lx] len=%d\n",
+              rp->req_num, len);
+
+       memset(&pkt, 0, sizeof(pkt));
+       pkt.data.tag.type = DS_DATA;
+       pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
+       pkt.data.handle = dp->handle;
+       pkt.res.req_num = rp->req_num;
+       pkt.res.result = DS_OK;
+
+       ds_send(lp, &pkt, sizeof(pkt));
+}
+
+struct ds_shutdown_req {
+       __u64                           req_num;
+       __u32                           ms_delay;
+};
+
+struct ds_shutdown_res {
+       __u64                           req_num;
+       __u32                           result;
+       char                            reason[1];
+};
+
+static void domain_shutdown_data(struct ldc_channel *lp,
+                                struct ds_cap_state *dp,
+                                void *buf, int len)
+{
+       struct ds_data *dpkt = buf;
+       struct ds_shutdown_req *rp;
+       struct {
+               struct ds_data          data;
+               struct ds_shutdown_res  res;
+       } pkt;
+
+       rp = (struct ds_shutdown_req *) (dpkt + 1);
+
+       printk(KERN_ALERT PFX "Shutdown request from "
+              "LDOM manager received.\n");
+
+       memset(&pkt, 0, sizeof(pkt));
+       pkt.data.tag.type = DS_DATA;
+       pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
+       pkt.data.handle = dp->handle;
+       pkt.res.req_num = rp->req_num;
+       pkt.res.result = DS_OK;
+       pkt.res.reason[0] = 0;
+
+       ds_send(lp, &pkt, sizeof(pkt));
+
+       wake_up_powerd();
+}
+
+struct ds_panic_req {
+       __u64                           req_num;
+};
+
+struct ds_panic_res {
+       __u64                           req_num;
+       __u32                           result;
+       char                            reason[1];
+};
+
+static void domain_panic_data(struct ldc_channel *lp,
+                             struct ds_cap_state *dp,
+                             void *buf, int len)
+{
+       struct ds_data *dpkt = buf;
+       struct ds_panic_req *rp;
+       struct {
+               struct ds_data          data;
+               struct ds_panic_res     res;
+       } pkt;
+
+       rp = (struct ds_panic_req *) (dpkt + 1);
+
+       printk(KERN_ERR PFX "Panic REQ [%lx], len=%d\n",
+              rp->req_num, len);
+
+       memset(&pkt, 0, sizeof(pkt));
+       pkt.data.tag.type = DS_DATA;
+       pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
+       pkt.data.handle = dp->handle;
+       pkt.res.req_num = rp->req_num;
+       pkt.res.result = DS_OK;
+       pkt.res.reason[0] = 0;
+
+       ds_send(lp, &pkt, sizeof(pkt));
+
+       panic("PANIC requested by LDOM manager.");
+}
+
+struct ds_cpu_tag {
+       __u64                           req_num;
+       __u32                           type;
+#define DS_CPU_CONFIGURE               0x43
+#define DS_CPU_UNCONFIGURE             0x55
+#define DS_CPU_FORCE_UNCONFIGURE       0x46
+#define DS_CPU_STATUS                  0x53
+
+/* Responses */
+#define DS_CPU_OK                      0x6f
+#define DS_CPU_ERROR                   0x65
+
+       __u32                           num_records;
+};
+
+struct ds_cpu_record {
+       __u32                           cpu_id;
+};
+
+static void dr_cpu_data(struct ldc_channel *lp,
+                       struct ds_cap_state *dp,
+                       void *buf, int len)
+{
+       struct ds_data *dpkt = buf;
+       struct ds_cpu_tag *rp;
+
+       rp = (struct ds_cpu_tag *) (dpkt + 1);
+
+       printk(KERN_ERR PFX "CPU REQ [%lx:%x], len=%d\n",
+              rp->req_num, rp->type, len);
+}
+
+struct ds_pri_msg {
+       __u64                           req_num;
+       __u64                           type;
+#define DS_PRI_REQUEST                 0x00
+#define DS_PRI_DATA                    0x01
+#define DS_PRI_UPDATE                  0x02
+};
+
+static void ds_pri_data(struct ldc_channel *lp,
+                       struct ds_cap_state *dp,
+                       void *buf, int len)
+{
+       struct ds_data *dpkt = buf;
+       struct ds_pri_msg *rp;
+
+       rp = (struct ds_pri_msg *) (dpkt + 1);
+
+       printk(KERN_ERR PFX "PRI REQ [%lx:%lx], len=%d\n",
+              rp->req_num, rp->type, len);
+}
+
+struct ds_cap_state ds_states[] = {
+       {
+               .service_id     = "md-update",
+               .data           = md_update_data,
+       },
+       {
+               .service_id     = "domain-shutdown",
+               .data           = domain_shutdown_data,
+       },
+       {
+               .service_id     = "domain-panic",
+               .data           = domain_panic_data,
+       },
+       {
+               .service_id     = "dr-cpu",
+               .data           = dr_cpu_data,
+       },
+       {
+               .service_id     = "pri",
+               .data           = ds_pri_data,
+       },
+};
+
+static struct ds_cap_state *find_cap(u64 handle)
+{
+       unsigned int index = handle >> 32;
+
+       if (index >= ARRAY_SIZE(ds_states))
+               return NULL;
+       return &ds_states[index];
+}
+
+static DEFINE_SPINLOCK(ds_lock);
+
+struct ds_info {
+       struct ldc_channel      *lp;
+       u8                      hs_state;
+#define DS_HS_START            0x01
+#define DS_HS_DONE             0x02
+
+       void                    *rcv_buf;
+       int                     rcv_buf_len;
+};
+
+static void ds_conn_reset(struct ds_info *dp)
+{
+       printk(KERN_ERR PFX "ds_conn_reset() from %p\n",
+              __builtin_return_address(0));
+}
+
+static int register_services(struct ds_info *dp)
+{
+       struct ldc_channel *lp = dp->lp;
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
+               struct {
+                       struct ds_reg_req req;
+                       u8 id_buf[256];
+               } pbuf;
+               struct ds_cap_state *cp = &ds_states[i];
+               int err, msg_len;
+               u64 new_count;
+
+               if (cp->state == CAP_STATE_REGISTERED)
+                       continue;
+
+               new_count = sched_clock() & 0xffffffff;
+               cp->handle = ((u64) i << 32) | new_count;
+
+               msg_len = (sizeof(struct ds_reg_req) +
+                          strlen(cp->service_id));
+
+               memset(&pbuf, 0, sizeof(pbuf));
+               pbuf.req.tag.type = DS_REG_REQ;
+               pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
+               pbuf.req.handle = cp->handle;
+               pbuf.req.major = 1;
+               pbuf.req.minor = 0;
+               strcpy(pbuf.req.svc_id, cp->service_id);
+
+               err = ds_send(lp, &pbuf, msg_len);
+               if (err > 0)
+                       cp->state = CAP_STATE_REG_SENT;
+       }
+       return 0;
+}
+
+static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
+{
+
+       if (dp->hs_state == DS_HS_START) {
+               if (pkt->type != DS_INIT_ACK)
+                       goto conn_reset;
+
+               dp->hs_state = DS_HS_DONE;
+
+               return register_services(dp);
+       }
+
+       if (dp->hs_state != DS_HS_DONE)
+               goto conn_reset;
+
+       if (pkt->type == DS_REG_ACK) {
+               struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
+               struct ds_cap_state *cp = find_cap(ap->handle);
+
+               if (!cp) {
+                       printk(KERN_ERR PFX "REG ACK for unknown handle %lx\n",
+                              ap->handle);
+                       return 0;
+               }
+               printk(KERN_INFO PFX "Registered %s service.\n",
+                      cp->service_id);
+               cp->state = CAP_STATE_REGISTERED;
+       } else if (pkt->type == DS_REG_NACK) {
+               struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
+               struct ds_cap_state *cp = find_cap(np->handle);
+
+               if (!cp) {
+                       printk(KERN_ERR PFX "REG NACK for "
+                              "unknown handle %lx\n",
+                              np->handle);
+                       return 0;
+               }
+               printk(KERN_ERR PFX "Could not register %s service\n",
+                      cp->service_id);
+               cp->state = CAP_STATE_UNKNOWN;
+       }
+
+       return 0;
+
+conn_reset:
+       ds_conn_reset(dp);
+       return -ECONNRESET;
+}
+
+static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
+{
+       struct ds_data *dpkt = (struct ds_data *) pkt;
+       struct ds_cap_state *cp = find_cap(dpkt->handle);
+
+       if (!cp) {
+               struct ds_data_nack nack = {
+                       .tag = {
+                               .type = DS_NACK,
+                               .len = (sizeof(struct ds_data_nack) -
+                                       sizeof(struct ds_msg_tag)),
+                       },
+                       .handle = dpkt->handle,
+                       .result = DS_INV_HDL,
+               };
+
+               printk(KERN_ERR PFX "Data for unknown handle %lu\n",
+                      dpkt->handle);
+               ds_send(dp->lp, &nack, sizeof(nack));
+       } else {
+               cp->data(dp->lp, cp, dpkt, len);
+       }
+       return 0;
+}
+
+static void ds_up(struct ds_info *dp)
+{
+       struct ldc_channel *lp = dp->lp;
+       struct ds_ver_req req;
+       int err;
+
+       req.tag.type = DS_INIT_REQ;
+       req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
+       req.ver.major = 1;
+       req.ver.minor = 0;
+
+       err = ds_send(lp, &req, sizeof(req));
+       if (err > 0)
+               dp->hs_state = DS_HS_START;
+}
+
+static void ds_event(void *arg, int event)
+{
+       struct ds_info *dp = arg;
+       struct ldc_channel *lp = dp->lp;
+       unsigned long flags;
+       int err;
+
+       spin_lock_irqsave(&ds_lock, flags);
+
+       if (event == LDC_EVENT_UP) {
+               ds_up(dp);
+               spin_unlock_irqrestore(&ds_lock, flags);
+               return;
+       }
+
+       if (event != LDC_EVENT_DATA_READY) {
+               printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
+               spin_unlock_irqrestore(&ds_lock, flags);
+               return;
+       }
+
+       err = 0;
+       while (1) {
+               struct ds_msg_tag *tag;
+
+               err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
+
+               if (unlikely(err < 0)) {
+                       if (err == -ECONNRESET)
+                               ds_conn_reset(dp);
+                       break;
+               }
+               if (err == 0)
+                       break;
+
+               tag = dp->rcv_buf;
+               err = ldc_read(lp, tag + 1, tag->len);
+
+               if (unlikely(err < 0)) {
+                       if (err == -ECONNRESET)
+                               ds_conn_reset(dp);
+                       break;
+               }
+               if (err < tag->len)
+                       break;
+
+               if (tag->type < DS_DATA)
+                       err = ds_handshake(dp, dp->rcv_buf);
+               else
+                       err = ds_data(dp, dp->rcv_buf,
+                                     sizeof(*tag) + err);
+               if (err == -ECONNRESET)
+                       break;
+       }
+
+       spin_unlock_irqrestore(&ds_lock, flags);
+}
+
+static int __devinit ds_probe(struct vio_dev *vdev,
+                             const struct vio_device_id *id)
+{
+       static int ds_version_printed;
+       struct mdesc_node *endp;
+       struct ldc_channel_config ds_cfg = {
+               .event          = ds_event,
+               .mtu            = 4096,
+               .mode           = LDC_MODE_STREAM,
+       };
+       struct ldc_channel *lp;
+       struct ds_info *dp;
+       const u64 *chan_id;
+       int err;
+
+       if (ds_version_printed++ == 0)
+               printk(KERN_INFO "%s", version);
+
+       endp = vio_find_endpoint(vdev);
+       if (!endp)
+               return -ENODEV;
+
+       chan_id = md_get_property(endp, "id", NULL);
+       if (!chan_id)
+               return -ENODEV;
+
+       dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+       err = -ENOMEM;
+       if (!dp)
+               goto out_err;
+
+       dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
+       if (!dp->rcv_buf)
+               goto out_free_dp;
+
+       dp->rcv_buf_len = 4096;
+
+       ds_cfg.tx_irq = endp->irqs[0];
+       ds_cfg.rx_irq = endp->irqs[1];
+
+       lp = ldc_alloc(*chan_id, &ds_cfg, dp);
+       if (IS_ERR(lp)) {
+               err = PTR_ERR(lp);
+               goto out_free_rcv_buf;
+       }
+       dp->lp = lp;
+
+       err = ldc_bind(lp);
+       if (err)
+               goto out_free_ldc;
+
+       start_powerd();
+
+       return err;
+
+out_free_ldc:
+       ldc_free(dp->lp);
+
+out_free_rcv_buf:
+       kfree(dp->rcv_buf);
+
+out_free_dp:
+       kfree(dp);
+
+out_err:
+       return err;
+}
+
+static int ds_remove(struct vio_dev *vdev)
+{
+       return 0;
+}
+
+static struct vio_device_id ds_match[] = {
+       {
+               .type = "domain-services-port",
+       },
+       {},
+};
+
+static struct vio_driver ds_driver = {
+       .id_table       = ds_match,
+       .probe          = ds_probe,
+       .remove         = ds_remove,
+       .driver         = {
+               .name   = "ds",
+               .owner  = THIS_MODULE,
+       }
+};
+
+static int __init ds_init(void)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(ds_states); i++)
+               ds_states[i].handle = ((u64)i << 32);
+
+       return vio_register_driver(&ds_driver);
+}
+
+subsys_initcall(ds_init);
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