[PATCH] s390: introduce struct channel_subsystem
struct channel_subsystem encapsulates several per channel subsystem properties, like status of chpids or the global path group id. Signed-off-by: Cornelia Huck <cohuck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Cornelia Huck
Linus Torvalds
parent
f97a56fb76
commit
a28c694481
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@ -24,8 +24,6 @@
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#include "ioasm.h"
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#include "chsc.h"
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static struct channel_path *chps[NR_CHPIDS];
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static void *sei_page;
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static int new_channel_path(int chpid);
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@ -33,13 +31,13 @@ static int new_channel_path(int chpid);
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static inline void
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set_chp_logically_online(int chp, int onoff)
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{
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chps[chp]->state = onoff;
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css[0]->chps[chp]->state = onoff;
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}
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static int
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get_chp_status(int chp)
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{
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return (chps[chp] ? chps[chp]->state : -ENODEV);
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return (css[0]->chps[chp] ? css[0]->chps[chp]->state : -ENODEV);
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}
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void
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@ -219,13 +217,13 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
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int j;
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int mask;
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struct subchannel *sch;
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__u8 *chpid;
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struct channel_path *chpid;
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struct schib schib;
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sch = to_subchannel(dev);
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chpid = data;
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for (j = 0; j < 8; j++)
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if (sch->schib.pmcw.chpid[j] == *chpid)
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if (sch->schib.pmcw.chpid[j] == chpid->id)
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break;
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if (j >= 8)
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return 0;
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@ -296,18 +294,20 @@ static inline void
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s390_set_chpid_offline( __u8 chpid)
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{
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char dbf_txt[15];
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struct device *dev;
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sprintf(dbf_txt, "chpr%x", chpid);
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CIO_TRACE_EVENT(2, dbf_txt);
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if (get_chp_status(chpid) <= 0)
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return;
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bus_for_each_dev(&css_bus_type, NULL, &chpid,
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dev = get_device(&css[0]->chps[chpid]->dev);
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bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev),
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s390_subchannel_remove_chpid);
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if (need_rescan || css_slow_subchannels_exist())
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queue_work(slow_path_wq, &slow_path_work);
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put_device(dev);
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}
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struct res_acc_data {
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@ -511,6 +511,7 @@ chsc_process_crw(void)
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ret = 0;
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do {
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int ccode, status;
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struct device *dev;
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memset(sei_area, 0, sizeof(*sei_area));
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memset(&res_data, 0, sizeof(struct res_acc_data));
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sei_area->request = (struct chsc_header) {
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@ -586,7 +587,8 @@ chsc_process_crw(void)
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new_channel_path(sei_area->rsid);
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else if (!status)
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break;
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res_data.chp = chps[sei_area->rsid];
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dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
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res_data.chp = to_channelpath(dev);
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pr_debug("chpid: %x", sei_area->rsid);
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if ((sei_area->vf & 0xc0) != 0) {
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res_data.fla = sei_area->fla;
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@ -602,6 +604,7 @@ chsc_process_crw(void)
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}
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ret = s390_process_res_acc(&res_data);
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pr_debug("\n\n");
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put_device(dev);
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break;
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default: /* other stuff */
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@ -678,6 +681,7 @@ chp_add(int chpid)
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{
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int rc;
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char dbf_txt[15];
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struct device *dev;
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if (!get_chp_status(chpid))
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return 0; /* no need to do the rest */
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@ -685,11 +689,13 @@ chp_add(int chpid)
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sprintf(dbf_txt, "cadd%x", chpid);
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CIO_TRACE_EVENT(2, dbf_txt);
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rc = for_each_subchannel(__chp_add, chps[chpid]);
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dev = get_device(&css[0]->chps[chpid]->dev);
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rc = for_each_subchannel(__chp_add, to_channelpath(dev));
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if (css_slow_subchannels_exist())
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rc = -EAGAIN;
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if (rc != -EAGAIN)
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rc = 0;
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put_device(dev);
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return rc;
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}
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@ -1016,7 +1022,7 @@ new_channel_path(int chpid)
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chp->id = chpid;
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chp->state = 1;
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chp->dev = (struct device) {
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.parent = &css_bus_device,
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.parent = &css[0]->device,
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.release = chp_release,
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};
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snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
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@ -1038,7 +1044,7 @@ new_channel_path(int chpid)
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device_unregister(&chp->dev);
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goto out_free;
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} else
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chps[chpid] = chp;
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css[0]->chps[chpid] = chp;
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return ret;
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out_free:
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kfree(chp);
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@ -1051,7 +1057,7 @@ chsc_get_chp_desc(struct subchannel *sch, int chp_no)
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struct channel_path *chp;
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struct channel_path_desc *desc;
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chp = chps[sch->schib.pmcw.chpid[chp_no]];
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chp = css[0]->chps[sch->schib.pmcw.chpid[chp_no]];
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if (!chp)
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return NULL;
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desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
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@ -1,8 +1,6 @@
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#ifndef S390_CHSC_H
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#define S390_CHSC_H
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#define NR_CHPIDS 256
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#define CHSC_SEI_ACC_CHPID 1
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#define CHSC_SEI_ACC_LINKADDR 2
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#define CHSC_SEI_ACC_FULLLINKADDR 3
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@ -65,4 +63,7 @@ extern int chsc_determine_css_characteristics(void);
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extern int css_characteristics_avail;
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extern void *chsc_get_chp_desc(struct subchannel*, int);
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#define to_channelpath(dev) container_of(dev, struct channel_path, dev)
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#endif
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@ -24,12 +24,9 @@
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int need_rescan = 0;
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int css_init_done = 0;
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struct pgid global_pgid;
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int css_characteristics_avail = 0;
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struct channel_subsystem *css[__MAX_CSSID + 1];
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struct device css_bus_device = {
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.bus_id = "css0",
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};
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int css_characteristics_avail = 0;
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inline int
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for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
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@ -112,7 +109,7 @@ css_register_subchannel(struct subchannel *sch)
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int ret;
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/* Initialize the subchannel structure */
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sch->dev.parent = &css_bus_device;
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sch->dev.parent = &css[0]->device;
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sch->dev.bus = &css_bus_type;
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sch->dev.release = &css_subchannel_release;
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@ -421,21 +418,35 @@ __init_channel_subsystem(struct subchannel_id schid, void *data)
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}
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static void __init
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css_generate_pgid(void)
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css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
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{
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/* Let's build our path group ID here. */
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if (css_characteristics_avail && css_general_characteristics.mcss)
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global_pgid.cpu_addr = 0x8000;
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else {
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if (css_characteristics_avail && css_general_characteristics.mcss) {
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css->global_pgid.pgid_high.ext_cssid.version = 0x80;
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css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid;
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} else {
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#ifdef CONFIG_SMP
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global_pgid.cpu_addr = hard_smp_processor_id();
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css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id();
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#else
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global_pgid.cpu_addr = 0;
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css->global_pgid.pgid_high.cpu_addr = 0;
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#endif
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}
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global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
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global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
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global_pgid.tod_high = (__u32) (get_clock() >> 32);
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css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
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css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
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css->global_pgid.tod_high = tod_high;
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}
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static inline void __init
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setup_css(int nr)
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{
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u32 tod_high;
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memset(css[nr], 0, sizeof(struct channel_subsystem));
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css[nr]->valid = 1;
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css[nr]->cssid = nr;
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sprintf(css[nr]->device.bus_id, "css%x", nr);
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tod_high = (u32) (get_clock() >> 32);
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css_generate_pgid(css[nr], tod_high);
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}
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/*
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@ -446,25 +457,39 @@ css_generate_pgid(void)
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static int __init
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init_channel_subsystem (void)
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{
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int ret;
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int ret, i;
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if (chsc_determine_css_characteristics() == 0)
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css_characteristics_avail = 1;
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css_generate_pgid();
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if ((ret = bus_register(&css_bus_type)))
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goto out;
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if ((ret = device_register (&css_bus_device)))
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goto out_bus;
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/* Setup css structure. */
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for (i = 0; i <= __MAX_CSSID; i++) {
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css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL);
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if (!css[i]) {
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ret = -ENOMEM;
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goto out_bus;
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}
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setup_css(i);
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ret = device_register(&css[i]->device);
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if (ret)
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goto out_free;
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}
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css_init_done = 1;
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ctl_set_bit(6, 28);
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for_each_subchannel(__init_channel_subsystem, NULL);
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return 0;
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out_free:
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kfree(css[i]);
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out_bus:
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while (i > 0) {
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i--;
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device_unregister(&css[i]->device);
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}
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bus_unregister(&css_bus_type);
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out:
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return ret;
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@ -35,19 +35,25 @@ struct path_state {
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__u8 resvd : 3; /* reserved */
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} __attribute__ ((packed));
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struct extended_cssid {
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u8 version;
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u8 cssid;
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} __attribute__ ((packed));
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struct pgid {
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union {
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__u8 fc; /* SPID function code */
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struct path_state ps; /* SNID path state */
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} inf;
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__u32 cpu_addr : 16; /* CPU address */
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union {
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__u32 cpu_addr : 16; /* CPU address */
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struct extended_cssid ext_cssid;
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} pgid_high;
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__u32 cpu_id : 24; /* CPU identification */
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__u32 cpu_model : 16; /* CPU model */
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__u32 tod_high; /* high word TOD clock */
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} __attribute__ ((packed));
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extern struct pgid global_pgid;
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#define MAX_CIWS 8
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/*
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@ -129,9 +135,20 @@ extern int css_init_done;
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extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
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#define __MAX_SUBCHANNEL 65535
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#define __MAX_CHPID 255
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#define __MAX_CSSID 0
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struct channel_subsystem {
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u8 cssid;
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int valid;
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struct channel_path *chps[__MAX_CHPID];
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struct device device;
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struct pgid global_pgid;
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};
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#define to_css(dev) container_of(dev, struct channel_subsystem, device)
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extern struct bus_type css_bus_type;
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extern struct device css_bus_device;
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extern struct channel_subsystem *css[];
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/* Some helper functions for disconnected state. */
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int device_is_disconnected(struct subchannel *);
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@ -986,10 +986,6 @@ ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
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cdev->dev = (struct device) {
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.parent = &sch->dev,
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};
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/* Initialize the subchannel structure */
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sch->dev.parent = &css_bus_device;
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sch->dev.bus = &css_bus_type;
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rc = io_subchannel_recog(cdev, sch);
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if (rc)
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return rc;
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@ -164,7 +164,7 @@ ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
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/* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */
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case 0: /* Sense Path Group ID successful. */
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if (cdev->private->pgid.inf.ps.state1 == SNID_STATE1_RESET)
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memcpy(&cdev->private->pgid, &global_pgid,
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memcpy(&cdev->private->pgid, &css[0]->global_pgid,
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sizeof(struct pgid));
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ccw_device_sense_pgid_done(cdev, 0);
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break;
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