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34196f82b1
Most wrappers around the channel subsystem call have their own logic to allocate memory (with proper alignment) or use preallocated or static memory. This patch converts most users of the channel subsystem call to use the same preallocated page (proteced by a spinlock). Note: The sei_page which is used in our crw handler to call "store event information" has to coexist, since a) in crw context, while accessing the sei_page, sleeping is allowed (which will conflict with the spinlock protection of the chsc_page) b) in crw context, while accessing the sei_page, channel subsystem calls are allowed (which itself would require the page). Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
#ifndef S390_CHSC_H
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#define S390_CHSC_H
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#include <linux/types.h>
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#include <linux/device.h>
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#include <asm/chpid.h>
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#include <asm/chsc.h>
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#include <asm/schid.h>
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#define CHSC_SDA_OC_MSS 0x2
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struct chsc_header {
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u16 length;
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u16 code;
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} __attribute__ ((packed));
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#define NR_MEASUREMENT_CHARS 5
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struct cmg_chars {
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u32 values[NR_MEASUREMENT_CHARS];
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} __attribute__ ((packed));
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#define NR_MEASUREMENT_ENTRIES 8
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struct cmg_entry {
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u32 values[NR_MEASUREMENT_ENTRIES];
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} __attribute__ ((packed));
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struct channel_path_desc {
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u8 flags;
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u8 lsn;
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u8 desc;
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u8 chpid;
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u8 swla;
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u8 zeroes;
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u8 chla;
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u8 chpp;
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} __attribute__ ((packed));
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struct channel_path;
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struct css_chsc_char {
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u64 res;
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u64 : 20;
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u32 secm : 1; /* bit 84 */
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u32 : 1;
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u32 scmc : 1; /* bit 86 */
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u32 : 20;
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u32 scssc : 1; /* bit 107 */
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u32 scsscf : 1; /* bit 108 */
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u32 : 19;
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}__attribute__((packed));
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extern struct css_chsc_char css_chsc_characteristics;
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struct chsc_ssd_info {
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u8 path_mask;
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u8 fla_valid_mask;
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struct chp_id chpid[8];
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u16 fla[8];
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};
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extern int chsc_get_ssd_info(struct subchannel_id schid,
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struct chsc_ssd_info *ssd);
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extern int chsc_determine_css_characteristics(void);
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extern int chsc_init(void);
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extern void chsc_init_cleanup(void);
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extern int chsc_enable_facility(int);
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struct channel_subsystem;
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extern int chsc_secm(struct channel_subsystem *, int);
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int __chsc_do_secm(struct channel_subsystem *css, int enable);
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int chsc_chp_vary(struct chp_id chpid, int on);
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int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
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int c, int m,
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struct chsc_response_struct *resp);
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int chsc_determine_base_channel_path_desc(struct chp_id chpid,
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struct channel_path_desc *desc);
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void chsc_chp_online(struct chp_id chpid);
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void chsc_chp_offline(struct chp_id chpid);
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int chsc_get_channel_measurement_chars(struct channel_path *chp);
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int chsc_error_from_response(int response);
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int chsc_siosl(struct subchannel_id schid);
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#endif
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