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s390x/pci: enforce zPCI state checking 

Current code uses some fields combinatorially to indicate the state of
a s390 pci device. This patch introduces device states in order to make
the code more readable and more logical.

Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Yi Min Zhao 2016-04-19 15:03:13 +08:00 committed by Cornelia Huck
parent 06a96dae11
commit 5d1abf2344
5 changed files with 230 additions and 82 deletions
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104
hw/s390x/s390-pci-bus.c
View File

@ -116,16 +116,22 @@ void s390_pci_sclp_configure(SCCB *sccb)
goto out;
}
if (pbdev) {
if (pbdev->configured) {
rc = SCLP_RC_NO_ACTION_REQUIRED;
} else {
pbdev->configured = true;
rc = SCLP_RC_NORMAL_COMPLETION;
}
} else {
if (!pbdev) {
DPRINTF("sclp config no dev found\n");
rc = SCLP_RC_ADAPTER_ID_NOT_RECOGNIZED;
goto out;
}
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
rc = SCLP_RC_ADAPTER_IN_RESERVED_STATE;
break;
case ZPCI_FS_STANDBY:
pbdev->state = ZPCI_FS_DISABLED;
rc = SCLP_RC_NORMAL_COMPLETION;
break;
default:
rc = SCLP_RC_NO_ACTION_REQUIRED;
}
out:
psccb->header.response_code = cpu_to_be16(rc);
@ -142,22 +148,28 @@ void s390_pci_sclp_deconfigure(SCCB *sccb)
goto out;
}
if (pbdev) {
if (!pbdev->configured) {
rc = SCLP_RC_NO_ACTION_REQUIRED;
} else {
if (pbdev->summary_ind) {
pci_dereg_irqs(pbdev);
}
if (pbdev->iommu_enabled) {
pci_dereg_ioat(pbdev);
}
pbdev->configured = false;
rc = SCLP_RC_NORMAL_COMPLETION;
}
} else {
if (!pbdev) {
DPRINTF("sclp deconfig no dev found\n");
rc = SCLP_RC_ADAPTER_ID_NOT_RECOGNIZED;
goto out;
}
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
rc = SCLP_RC_ADAPTER_IN_RESERVED_STATE;
break;
case ZPCI_FS_STANDBY:
rc = SCLP_RC_NO_ACTION_REQUIRED;
break;
default:
if (pbdev->summary_ind) {
pci_dereg_irqs(pbdev);
}
if (pbdev->iommu_enabled) {
pci_dereg_ioat(pbdev);
}
pbdev->state = ZPCI_FS_STANDBY;
rc = SCLP_RC_NORMAL_COMPLETION;
}
out:
psccb->header.response_code = cpu_to_be16(rc);
@ -183,7 +195,7 @@ S390PCIBusDevice *s390_pci_find_dev_by_idx(uint32_t idx)
for (i = 0; i < PCI_SLOT_MAX; i++) {
pbdev = &s->pbdev[i];
if (pbdev->fh == 0) {
if (pbdev->state == ZPCI_FS_RESERVED) {
continue;
}
@ -233,9 +245,8 @@ static void s390_pci_generate_plug_event(uint16_t pec, uint32_t fh,
s390_pci_generate_event(2, pec, fh, fid, 0, 0);
}
static void s390_pci_generate_error_event(uint16_t pec, uint32_t fh,
uint32_t fid, uint64_t faddr,
uint32_t e)
void s390_pci_generate_error_event(uint16_t pec, uint32_t fh, uint32_t fid,
uint64_t faddr, uint32_t e)
{
s390_pci_generate_event(1, pec, fh, fid, faddr, e);
}
@ -337,8 +348,14 @@ static IOMMUTLBEntry s390_translate_iommu(MemoryRegion *iommu, hwaddr addr,
.perm = IOMMU_NONE,
};
if (!pbdev->configured || !pbdev->pdev ||
!(pbdev->fh & FH_MASK_ENABLE) || !pbdev->iommu_enabled) {
switch (pbdev->state) {
case ZPCI_FS_ENABLED:
case ZPCI_FS_BLOCKED:
if (!pbdev->iommu_enabled) {
return ret;
}
break;
default:
return ret;
}
@ -357,30 +374,13 @@ static IOMMUTLBEntry s390_translate_iommu(MemoryRegion *iommu, hwaddr addr,
return ret;
}
if (!pbdev->g_iota) {
pbdev->error_state = true;
pbdev->lgstg_blocked = true;
s390_pci_generate_error_event(ERR_EVENT_INVALAS, pbdev->fh, pbdev->fid,
addr, 0);
return ret;
}
if (addr < pbdev->pba || addr > pbdev->pal) {
pbdev->error_state = true;
pbdev->lgstg_blocked = true;
s390_pci_generate_error_event(ERR_EVENT_OORANGE, pbdev->fh, pbdev->fid,
addr, 0);
return ret;
}
pte = s390_guest_io_table_walk(s390_pci_get_table_origin(pbdev->g_iota),
addr);
if (!pte) {
pbdev->error_state = true;
pbdev->lgstg_blocked = true;
s390_pci_generate_error_event(ERR_EVENT_SERR, pbdev->fh, pbdev->fid,
addr, ERR_EVENT_Q_BIT);
return ret;
}
@ -449,7 +449,7 @@ static void s390_msi_ctrl_write(void *opaque, hwaddr addr, uint64_t data,
return;
}
if (!(pbdev->fh & FH_MASK_ENABLE)) {
if (pbdev->state != ZPCI_FS_ENABLED) {
return;
}
@ -571,7 +571,7 @@ static void s390_pcihost_hot_plug(HotplugHandler *hotplug_dev,
pbdev->fid = s390_pci_get_pfid(pci_dev);
pbdev->pdev = pci_dev;
pbdev->configured = true;
pbdev->state = ZPCI_FS_DISABLED;
pbdev->fh = s390_pci_get_pfh(pci_dev);
s390_pcihost_setup_msix(pbdev);
@ -592,8 +592,12 @@ static void s390_pcihost_hot_unplug(HotplugHandler *hotplug_dev,
->qbus.parent);
S390PCIBusDevice *pbdev = &s->pbdev[PCI_SLOT(pci_dev->devfn)];
if (pbdev->configured) {
pbdev->configured = false;
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
goto out;
case ZPCI_FS_STANDBY:
break;
default:
s390_pci_generate_plug_event(HP_EVENT_CONFIGURED_TO_STBRES,
pbdev->fh, pbdev->fid);
}
@ -603,6 +607,8 @@ static void s390_pcihost_hot_unplug(HotplugHandler *hotplug_dev,
pbdev->fh = 0;
pbdev->fid = 0;
pbdev->pdev = NULL;
pbdev->state = ZPCI_FS_RESERVED;
out:
object_unparent(OBJECT(pci_dev));
}

34
hw/s390x/s390-pci-bus.h
View File

@ -153,6 +153,34 @@ enum ZpciIoatDtype {
#define ZPCI_TABLE_VALID_MASK 0x20
#define ZPCI_TABLE_PROT_MASK 0x200
/* PCI Function States
*
* reserved: default; device has just been plugged or is in progress of being
* unplugged
* standby: device is present but not configured; transition from any
* configured state/to this state via sclp configure/deconfigure
*
* The following states make up the "configured" meta-state:
* disabled: device is configured but not enabled; transition between this
* state and enabled via clp enable/disable
* enbaled: device is ready for use; transition to disabled via clp disable;
* may enter an error state
* blocked: ignore all DMA and interrupts; transition back to enabled or from
* error state via mpcifc
* error: an error occured; transition back to enabled via mpcifc
* permanent error: an unrecoverable error occured; transition to standby via
* sclp deconfigure
*/
typedef enum {
ZPCI_FS_RESERVED,
ZPCI_FS_STANDBY,
ZPCI_FS_DISABLED,
ZPCI_FS_ENABLED,
ZPCI_FS_BLOCKED,
ZPCI_FS_ERROR,
ZPCI_FS_PERMANENT_ERROR,
} ZpciState;
typedef struct SeiContainer {
QTAILQ_ENTRY(SeiContainer) link;
uint32_t fid;
@ -219,9 +247,7 @@ typedef struct S390MsixInfo {
typedef struct S390PCIBusDevice {
PCIDevice *pdev;
bool configured;
bool error_state;
bool lgstg_blocked;
ZpciState state;
bool iommu_enabled;
uint32_t fh;
uint32_t fid;
@ -255,6 +281,8 @@ void s390_pci_sclp_configure(SCCB *sccb);
void s390_pci_sclp_deconfigure(SCCB *sccb);
void s390_pci_iommu_enable(S390PCIBusDevice *pbdev);
void s390_pci_iommu_disable(S390PCIBusDevice *pbdev);
void s390_pci_generate_error_event(uint16_t pec, uint32_t fh, uint32_t fid,
uint64_t faddr, uint32_t e);
S390PCIBusDevice *s390_pci_find_dev_by_idx(uint32_t idx);
S390PCIBusDevice *s390_pci_find_dev_by_fh(uint32_t fh);
S390PCIBusDevice *s390_pci_find_dev_by_fid(uint32_t fid);

168
hw/s390x/s390-pci-inst.c
View File

@ -108,8 +108,9 @@ static int list_pci(ClpReqRspListPci *rrb, uint8_t *cc)
pci_get_word(pbdev->pdev->config + PCI_DEVICE_ID));
stw_p(&rrb->response.fh_list[idx - resume_token].vendor_id,
pci_get_word(pbdev->pdev->config + PCI_VENDOR_ID));
/* Ignore RESERVED devices. */
stl_p(&rrb->response.fh_list[idx - resume_token].config,
pbdev->configured << 31);
pbdev->state == ZPCI_FS_STANDBY ? 0 : 1 << 31);
stl_p(&rrb->response.fh_list[idx - resume_token].fid, pbdev->fid);
stl_p(&rrb->response.fh_list[idx - resume_token].fh, pbdev->fh);
@ -213,13 +214,13 @@ int clp_service_call(S390CPU *cpu, uint8_t r2)
switch (reqsetpci->oc) {
case CLP_SET_ENABLE_PCI_FN:
pbdev->fh |= FH_MASK_ENABLE;
pbdev->state = ZPCI_FS_ENABLED;
stl_p(&ressetpci->fh, pbdev->fh);
stw_p(&ressetpci->hdr.rsp, CLP_RC_OK);
break;
case CLP_SET_DISABLE_PCI_FN:
pbdev->fh &= ~FH_MASK_ENABLE;
pbdev->error_state = false;
pbdev->lgstg_blocked = false;
pbdev->state = ZPCI_FS_DISABLED;
stl_p(&ressetpci->fh, pbdev->fh);
stw_p(&ressetpci->hdr.rsp, CLP_RC_OK);
break;
@ -318,16 +319,25 @@ int pcilg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
offset = env->regs[r2 + 1];
pbdev = s390_pci_find_dev_by_fh(fh);
if (!pbdev || !(pbdev->fh & FH_MASK_ENABLE)) {
if (!pbdev) {
DPRINTF("pcilg no pci dev\n");
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
}
if (pbdev->lgstg_blocked) {
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
case ZPCI_FS_STANDBY:
case ZPCI_FS_DISABLED:
case ZPCI_FS_PERMANENT_ERROR:
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
case ZPCI_FS_ERROR:
setcc(cpu, ZPCI_PCI_LS_ERR);
s390_set_status_code(env, r2, ZPCI_PCI_ST_BLOCKED);
return 0;
default:
break;
}
if (pcias < 6) {
@ -435,16 +445,25 @@ int pcistg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
offset = env->regs[r2 + 1];
pbdev = s390_pci_find_dev_by_fh(fh);
if (!pbdev || !(pbdev->fh & FH_MASK_ENABLE)) {
if (!pbdev) {
DPRINTF("pcistg no pci dev\n");
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
}
if (pbdev->lgstg_blocked) {
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
case ZPCI_FS_STANDBY:
case ZPCI_FS_DISABLED:
case ZPCI_FS_PERMANENT_ERROR:
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
case ZPCI_FS_ERROR:
setcc(cpu, ZPCI_PCI_LS_ERR);
s390_set_status_code(env, r2, ZPCI_PCI_ST_BLOCKED);
return 0;
default:
break;
}
data = env->regs[r1];
@ -526,18 +545,55 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
end = start + env->regs[r2 + 1];
pbdev = s390_pci_find_dev_by_fh(fh);
if (!pbdev || !(pbdev->fh & FH_MASK_ENABLE)) {
if (!pbdev) {
DPRINTF("rpcit no pci dev\n");
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
goto out;
}
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
case ZPCI_FS_STANDBY:
case ZPCI_FS_DISABLED:
case ZPCI_FS_PERMANENT_ERROR:
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
case ZPCI_FS_ERROR:
setcc(cpu, ZPCI_PCI_LS_ERR);
s390_set_status_code(env, r1, ZPCI_MOD_ST_ERROR_RECOVER);
return 0;
default:
break;
}
if (!pbdev->g_iota) {
pbdev->state = ZPCI_FS_ERROR;
setcc(cpu, ZPCI_PCI_LS_ERR);
s390_set_status_code(env, r1, ZPCI_PCI_ST_INSUF_RES);
s390_pci_generate_error_event(ERR_EVENT_INVALAS, pbdev->fh, pbdev->fid,
start, 0);
goto out;
}
if (end < pbdev->pba || start > pbdev->pal) {
pbdev->state = ZPCI_FS_ERROR;
setcc(cpu, ZPCI_PCI_LS_ERR);
s390_set_status_code(env, r1, ZPCI_PCI_ST_INSUF_RES);
s390_pci_generate_error_event(ERR_EVENT_OORANGE, pbdev->fh, pbdev->fid,
start, 0);
goto out;
}
mr = &pbdev->iommu_mr;
while (start < end) {
entry = mr->iommu_ops->translate(mr, start, 0);
if (!entry.translated_addr) {
pbdev->state = ZPCI_FS_ERROR;
setcc(cpu, ZPCI_PCI_LS_ERR);
s390_set_status_code(env, r1, ZPCI_PCI_ST_INSUF_RES);
s390_pci_generate_error_event(ERR_EVENT_SERR, pbdev->fh, pbdev->fid,
start, ERR_EVENT_Q_BIT);
goto out;
}
@ -590,16 +646,25 @@ int pcistb_service_call(S390CPU *cpu, uint8_t r1, uint8_t r3, uint64_t gaddr,
}
pbdev = s390_pci_find_dev_by_fh(fh);
if (!pbdev || !(pbdev->fh & FH_MASK_ENABLE)) {
if (!pbdev) {
DPRINTF("pcistb no pci dev fh 0x%x\n", fh);
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
}
if (pbdev->lgstg_blocked) {
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
case ZPCI_FS_STANDBY:
case ZPCI_FS_DISABLED:
case ZPCI_FS_PERMANENT_ERROR:
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
case ZPCI_FS_ERROR:
setcc(cpu, ZPCI_PCI_LS_ERR);
s390_set_status_code(env, r1, ZPCI_PCI_ST_BLOCKED);
return 0;
default:
break;
}
mr = pbdev->pdev->io_regions[pcias].memory;
@ -743,12 +808,23 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar)
}
pbdev = s390_pci_find_dev_by_fh(fh);
if (!pbdev || !(pbdev->fh & FH_MASK_ENABLE)) {
if (!pbdev) {
DPRINTF("mpcifc no pci dev fh 0x%x\n", fh);
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
}
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
case ZPCI_FS_STANDBY:
case ZPCI_FS_DISABLED:
case ZPCI_FS_PERMANENT_ERROR:
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
default:
break;
}
if (s390_cpu_virt_mem_read(cpu, fiba, ar, (uint8_t *)&fib, sizeof(fib))) {
return 0;
}
@ -815,11 +891,25 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar)
}
break;
case ZPCI_MOD_FC_RESET_ERROR:
pbdev->error_state = false;
pbdev->lgstg_blocked = false;
switch (pbdev->state) {
case ZPCI_FS_BLOCKED:
case ZPCI_FS_ERROR:
pbdev->state = ZPCI_FS_ENABLED;
break;
default:
cc = ZPCI_PCI_LS_ERR;
s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
}
break;
case ZPCI_MOD_FC_RESET_BLOCK:
pbdev->lgstg_blocked = false;
switch (pbdev->state) {
case ZPCI_FS_ERROR:
pbdev->state = ZPCI_FS_BLOCKED;
break;
default:
cc = ZPCI_PCI_LS_ERR;
s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
}
break;
case ZPCI_MOD_FC_SET_MEASURE:
pbdev->fmb_addr = ldq_p(&fib.fmb_addr);
@ -861,6 +951,39 @@ int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar)
}
memset(&fib, 0, sizeof(fib));
switch (pbdev->state) {
case ZPCI_FS_RESERVED:
case ZPCI_FS_STANDBY:
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
case ZPCI_FS_DISABLED:
if (fh & FH_MASK_ENABLE) {
setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
return 0;
}
goto out;
/* BLOCKED bit is set to one coincident with the setting of ERROR bit.
* FH Enabled bit is set to one in states of ENABLED, BLOCKED or ERROR. */
case ZPCI_FS_ERROR:
fib.fc |= 0x20;
case ZPCI_FS_BLOCKED:
fib.fc |= 0x40;
case ZPCI_FS_ENABLED:
fib.fc |= 0x80;
if (pbdev->iommu_enabled) {
fib.fc |= 0x10;
}
if (!(fh & FH_MASK_ENABLE)) {
env->regs[r1] |= 1ULL << 63;
}
break;
case ZPCI_FS_PERMANENT_ERROR:
setcc(cpu, ZPCI_PCI_LS_ERR);
s390_set_status_code(env, r1, ZPCI_STPCIFC_ST_PERM_ERROR);
return 0;
}
stq_p(&fib.pba, pbdev->pba);
stq_p(&fib.pal, pbdev->pal);
stq_p(&fib.iota, pbdev->g_iota);
@ -873,22 +996,7 @@ int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar)
((uint32_t)pbdev->sum << 7) | pbdev->routes.adapter.summary_offset;
stl_p(&fib.data, data);
if (pbdev->fh & FH_MASK_ENABLE) {
fib.fc |= 0x80;
}
if (pbdev->error_state) {
fib.fc |= 0x40;
}
if (pbdev->lgstg_blocked) {
fib.fc |= 0x20;
}
if (pbdev->g_iota) {
fib.fc |= 0x10;
}
out:
if (s390_cpu_virt_mem_write(cpu, fiba, ar, (uint8_t *)&fib, sizeof(fib))) {
return 0;
}

5
hw/s390x/s390-pci-inst.h
View File

@ -249,6 +249,11 @@ typedef struct ClpReqRspQueryPciGrp {
#define ZPCI_MOD_FC_RESET_BLOCK 9
#define ZPCI_MOD_FC_SET_MEASURE 10
/* Store PCI Function Controls status codes */
#define ZPCI_STPCIFC_ST_PERM_ERROR 8
#define ZPCI_STPCIFC_ST_INVAL_DMAAS 28
#define ZPCI_STPCIFC_ST_ERROR_RECOVER 40
/* FIB function controls */
#define ZPCI_FIB_FC_ENABLED 0x80
#define ZPCI_FIB_FC_ERROR 0x40

1
include/hw/s390x/sclp.h
View File

@ -58,6 +58,7 @@
#define SCLP_RC_CONTAINED_EQUIPMENT_CHECK 0x0340
#define SCLP_RC_INSUFFICIENT_SCCB_LENGTH 0x0300
#define SCLP_RC_STANDBY_READ_COMPLETION 0x0410
#define SCLP_RC_ADAPTER_IN_RESERVED_STATE 0x05f0
#define SCLP_RC_ADAPTER_ID_NOT_RECOGNIZED 0x09f0
#define SCLP_RC_INVALID_FUNCTION 0x40f0
#define SCLP_RC_NO_EVENT_BUFFERS_STORED 0x60f0