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s390/pci: introduce clp_get_state

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Code handling pci hotplug needs to determine the configuration
state of a pci function. Implement clp_get_state as a wrapper
for list pci functions.

Also change enum zpci_state to match the configuration state
values.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2017-04-26 18:59:52 +02:00 committed by Martin Schwidefsky
parent 4e5bd7803b
commit 783684f1f6
2 changed files with 47 additions and 14 deletions
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10
arch/s390/include/asm/pci.h
View File

@ -70,11 +70,10 @@ struct zpci_fmb {
} __packed __aligned(128);
enum zpci_state {
ZPCI_FN_STATE_RESERVED,
ZPCI_FN_STATE_STANDBY,
ZPCI_FN_STATE_CONFIGURED,
ZPCI_FN_STATE_ONLINE,
NR_ZPCI_FN_STATES,
ZPCI_FN_STATE_STANDBY = 0,
ZPCI_FN_STATE_CONFIGURED = 1,
ZPCI_FN_STATE_RESERVED = 2,
ZPCI_FN_STATE_ONLINE = 3,
};
struct zpci_bar_struct {
@ -172,6 +171,7 @@ int clp_rescan_pci_devices_simple(void);
int clp_add_pci_device(u32, u32, int);
int clp_enable_fh(struct zpci_dev *, u8);
int clp_disable_fh(struct zpci_dev *);
int clp_get_state(u32 fid, enum zpci_state *state);
#ifdef CONFIG_PCI
/* Error handling and recovery */

51
arch/s390/pci/pci_clp.c
View File

@ -295,8 +295,8 @@ int clp_disable_fh(struct zpci_dev *zdev)
return rc;
}
static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
void (*cb)(struct clp_fh_list_entry *entry))
static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
void (*cb)(struct clp_fh_list_entry *, void *))
{
u64 resume_token = 0;
int entries, i, rc;
@ -327,13 +327,13 @@ static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
resume_token = rrb->response.resume_token;
for (i = 0; i < entries; i++)
cb(&rrb->response.fh_list[i]);
cb(&rrb->response.fh_list[i], data);
} while (resume_token);
out:
return rc;
}
static void __clp_add(struct clp_fh_list_entry *entry)
static void __clp_add(struct clp_fh_list_entry *entry, void *data)
{
if (!entry->vendor_id)
return;
@ -341,7 +341,7 @@ static void __clp_add(struct clp_fh_list_entry *entry)
clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
}
static void __clp_rescan(struct clp_fh_list_entry *entry)
static void __clp_rescan(struct clp_fh_list_entry *entry, void *data)
{
struct zpci_dev *zdev;
@ -364,7 +364,7 @@ static void __clp_rescan(struct clp_fh_list_entry *entry)
}
}
static void __clp_update(struct clp_fh_list_entry *entry)
static void __clp_update(struct clp_fh_list_entry *entry, void *data)
{
struct zpci_dev *zdev;
@ -387,7 +387,7 @@ int clp_scan_pci_devices(void)
if (!rrb)
return -ENOMEM;
rc = clp_list_pci(rrb, __clp_add);
rc = clp_list_pci(rrb, NULL, __clp_add);
clp_free_block(rrb);
return rc;
@ -402,7 +402,7 @@ int clp_rescan_pci_devices(void)
if (!rrb)
return -ENOMEM;
rc = clp_list_pci(rrb, __clp_rescan);
rc = clp_list_pci(rrb, NULL, __clp_rescan);
clp_free_block(rrb);
return rc;
@ -417,7 +417,40 @@ int clp_rescan_pci_devices_simple(void)
if (!rrb)
return -ENOMEM;
rc = clp_list_pci(rrb, __clp_update);
rc = clp_list_pci(rrb, NULL, __clp_update);
clp_free_block(rrb);
return rc;
}
struct clp_state_data {
u32 fid;
enum zpci_state state;
};
static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
{
struct clp_state_data *sd = data;
if (entry->fid != sd->fid)
return;
sd->state = entry->config_state;
}
int clp_get_state(u32 fid, enum zpci_state *state)
{
struct clp_req_rsp_list_pci *rrb;
struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
int rc;
rrb = clp_alloc_block(GFP_KERNEL);
if (!rrb)
return -ENOMEM;
rc = clp_list_pci(rrb, &sd, __clp_get_state);
if (!rc)
*state = sd.state;
clp_free_block(rrb);
return rc;