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s390/sclp: generic event mask accessors

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Switch the layout of the event masks to be a generic buffer, and
implement accessors to retrieve the values of the masks.

This will be needed in the next patches, where we will eventually switch
the mask size to 64 bits.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Claudio Imbrenda
2018-01-23 16:41:38 +01:00
committed by Martin Schwidefsky
parent 0ee5f8dcd6
commit b843563518
4 changed files with 75 additions and 23 deletions
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29
drivers/s390/char/sclp.c
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@@ -618,9 +618,12 @@ struct sclp_statechangebuf {
u16 _zeros : 12;
u16 mask_length;
u64 sclp_active_facility_mask;
sccb_mask_t sclp_receive_mask;
sccb_mask_t sclp_send_mask;
u32 read_data_function_mask;
u8 masks[2 * 1021 + 4]; /* variable length */
/*
* u8 sclp_receive_mask[mask_length];
* u8 sclp_send_mask[mask_length];
* u32 read_data_function_mask;
*/
} __attribute__((packed));
@@ -631,14 +634,14 @@ sclp_state_change_cb(struct evbuf_header *evbuf)
unsigned long flags;
struct sclp_statechangebuf *scbuf;
BUILD_BUG_ON(sizeof(struct sclp_statechangebuf) > PAGE_SIZE);
scbuf = (struct sclp_statechangebuf *) evbuf;
if (scbuf->mask_length != sizeof(sccb_mask_t))
return;
spin_lock_irqsave(&sclp_lock, flags);
if (scbuf->validity_sclp_receive_mask)
sclp_receive_mask = scbuf->sclp_receive_mask;
sclp_receive_mask = sccb_get_recv_mask(scbuf);
if (scbuf->validity_sclp_send_mask)
sclp_send_mask = scbuf->sclp_send_mask;
sclp_send_mask = sccb_get_send_mask(scbuf);
spin_unlock_irqrestore(&sclp_lock, flags);
if (scbuf->validity_sclp_active_facility_mask)
sclp.facilities = scbuf->sclp_active_facility_mask;
@@ -763,10 +766,10 @@ __sclp_make_init_req(sccb_mask_t receive_mask, sccb_mask_t send_mask)
sclp_init_req.sccb = sccb;
sccb->header.length = sizeof(*sccb);
sccb->mask_length = sizeof(sccb_mask_t);
sccb->receive_mask = receive_mask;
sccb->send_mask = send_mask;
sccb->sclp_receive_mask = 0;
sccb->sclp_send_mask = 0;
sccb_set_recv_mask(sccb, receive_mask);
sccb_set_send_mask(sccb, send_mask);
sccb_set_sclp_recv_mask(sccb, 0);
sccb_set_sclp_send_mask(sccb, 0);
}
/* Start init mask request. If calculate is non-zero, calculate the mask as
@@ -822,8 +825,8 @@ sclp_init_mask(int calculate)
sccb->header.response_code == 0x20) {
/* Successful request */
if (calculate) {
sclp_receive_mask = sccb->sclp_receive_mask;
sclp_send_mask = sccb->sclp_send_mask;
sclp_receive_mask = sccb_get_sclp_recv_mask(sccb);
sclp_send_mask = sccb_get_sclp_send_mask(sccb);
} else {
sclp_receive_mask = 0;
sclp_send_mask = 0;