From 783684f1f60faec09f3ac74c0b12e89bdb182429 Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Wed, 26 Apr 2017 18:59:52 +0200 Subject: s390/pci: introduce clp_get_state 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 Reviewed-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/pci.h | 10 ++++----- arch/s390/pci/pci_clp.c | 51 +++++++++++++++++++++++++++++++++++++-------- 2 files changed, 47 insertions(+), 14 deletions(-) (limited to 'arch') diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index 328142c..01c58d4 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -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 */ diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c index 1c3332a..267cdd6 100644 --- a/arch/s390/pci/pci_clp.c +++ b/arch/s390/pci/pci_clp.c @@ -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; -- cgit v1.1