xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[S390] chsc: use the global page to determine the chp desriptor

Browse Source 
chsc_determine_channel_path_desc is called by a wrapper
who allocates a response struct. The response data
is then memcpy'ed to this response struct by
chsc_determine_channel_path_desc.

Change chsc_determine_base_channel_path_desc to use the
global chsc_page and deliver it to the function doing
the actual chsc call. The channel path desriptor is
then directly read from the response data.

As a result we get rid of the additional allocation
for the response struct.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2010-10-25 16:10:30 +02:00
committed by Martin Schwidefsky
parent 34196f82b1
commit 906c9768c7
3 changed files with 44 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/s390/cio/chsc.h
View File

@@ -57,6 +57,25 @@ struct chsc_ssd_info {
struct chp_id chpid[8];
u16 fla[8];
};
struct chsc_scpd {
struct chsc_header request;
u32:2;
u32 m:1;
u32 c:1;
u32 fmt:4;
u32 cssid:8;
u32:4;
u32 rfmt:4;
u32 first_chpid:8;
u32:24;
u32 last_chpid:8;
u32 zeroes1;
struct chsc_header response;
u8 data[PAGE_SIZE - 20];
} __attribute__ ((packed));
extern int chsc_get_ssd_info(struct subchannel_id schid,
struct chsc_ssd_info *ssd);
extern int chsc_determine_css_characteristics(void);
@@ -70,8 +89,7 @@ int __chsc_do_secm(struct channel_subsystem *css, int enable);
int chsc_chp_vary(struct chp_id chpid, int on);
int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
int c, int m,
struct chsc_response_struct *resp);
int c, int m, void *page);
int chsc_determine_base_channel_path_desc(struct chp_id chpid,
struct channel_path_desc *desc);
void chsc_chp_online(struct chp_id chpid);