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s390/pci: use unique UIDs for domain enumeration

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Use UIDs as domain numbers if the UID checking rules apply (in this
case the FW guarantees uniqueness of these values).

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 2016-01-27 13:33:30 +01:00 committed by Martin Schwidefsky
parent 80abb39b50
commit 5c5afd0201
3 changed files with 15 additions and 1 deletions
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5
arch/s390/include/asm/pci_clp.h
View file

@ -46,6 +46,8 @@ struct clp_fh_list_entry {
#define CLP_UTIL_STR_LEN 64
#define CLP_PFIP_NR_SEGMENTS 4
extern bool zpci_unique_uid;
/* List PCI functions request */
struct clp_req_list_pci {
struct clp_req_hdr hdr;
@ -59,7 +61,8 @@ struct clp_rsp_list_pci {
u64 resume_token;
u32 reserved2;
u16 max_fn;
u8 reserved3;
u8 : 7;
u8 uid_checking : 1;
u8 entry_size;
struct clp_fh_list_entry fh_list[CLP_FH_LIST_NR_ENTRIES];
} __packed;

8
arch/s390/pci/pci.c
View file

@ -722,6 +722,11 @@ struct dev_pm_ops pcibios_pm_ops = {
static int zpci_alloc_domain(struct zpci_dev *zdev)
{
if (zpci_unique_uid) {
zdev->domain = (u16) zdev->uid;
return 0;
}
spin_lock(&zpci_domain_lock);
zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
if (zdev->domain == ZPCI_NR_DEVICES) {
@ -735,6 +740,9 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
static void zpci_free_domain(struct zpci_dev *zdev)
{
if (zpci_unique_uid)
return;
spin_lock(&zpci_domain_lock);
clear_bit(zdev->domain, zpci_domain);
spin_unlock(&zpci_domain_lock);

3
arch/s390/pci/pci_clp.c
View file

@ -22,6 +22,8 @@
#include <asm/clp.h>
#include <uapi/asm/clp.h>
bool zpci_unique_uid;
static inline void zpci_err_clp(unsigned int rsp, int rc)
{
struct {
@ -315,6 +317,7 @@ static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
goto out;
}
zpci_unique_uid = rrb->response.uid_checking;
WARN_ON_ONCE(rrb->response.entry_size !=
sizeof(struct clp_fh_list_entry));