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linux_dsm_epyc7002/arch/powerpc/platforms/powernv/pci.c
Frederic Barrat 2552910084 powerpc/powernv: Enable PCI peer-to-peer 
P9 has support for PCI peer-to-peer, enabling a device to write in the
MMIO space of another device directly, without interrupting the CPU.

This patch adds support for it on powernv, by adding a new API to be
called by drivers. The pnv_pci_set_p2p(...) call configures an
'initiator', i.e the device which will issue the MMIO operation, and a
'target', i.e. the device on the receiving side.

P9 really only supports MMIO stores for the time being but that's
expected to change in the future, so the API allows to define both
load and store operations.

  /* PCI p2p descriptor */
  #define OPAL_PCI_P2P_ENABLE           0x1
  #define OPAL_PCI_P2P_LOAD             0x2
  #define OPAL_PCI_P2P_STORE            0x4

  int pnv_pci_set_p2p(struct pci_dev *initiator, struct pci_dev *target,
                      u64 desc)

It uses a new OPAL call, as the configuration magic is done on the
PHBs by skiboot.

Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Russell Currey <ruscur@russell.cc>
[mpe: Drop unrelated OPAL calls, s/uint64_t/u64/, minor formatting]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-08-08 11:27:30 +10:00

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/*
* Support PCI/PCIe on PowerNV platforms
*
* Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/msi.h>
#include <linux/iommu.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/msi_bitmap.h>
#include <asm/ppc-pci.h>
#include <asm/pnv-pci.h>
#include <asm/opal.h>
#include <asm/iommu.h>
#include <asm/tce.h>
#include <asm/firmware.h>
#include <asm/eeh_event.h>
#include <asm/eeh.h>
#include "powernv.h"
#include "pci.h"
static DEFINE_MUTEX(p2p_mutex);
int pnv_pci_get_slot_id(struct device_node *np, uint64_t *id)
{
struct device_node *parent = np;
u32 bdfn;
u64 phbid;
int ret;
ret = of_property_read_u32(np, "reg", &bdfn);
if (ret)
return -ENXIO;
bdfn = ((bdfn & 0x00ffff00) >> 8);
while ((parent = of_get_parent(parent))) {
if (!PCI_DN(parent)) {
of_node_put(parent);
break;
}
if (!of_device_is_compatible(parent, "ibm,ioda2-phb")) {
of_node_put(parent);
continue;
}
ret = of_property_read_u64(parent, "ibm,opal-phbid", &phbid);
if (ret) {
of_node_put(parent);
return -ENXIO;
}
*id = PCI_SLOT_ID(phbid, bdfn);
return 0;
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(pnv_pci_get_slot_id);
int pnv_pci_get_device_tree(uint32_t phandle, void *buf, uint64_t len)
{
int64_t rc;
if (!opal_check_token(OPAL_GET_DEVICE_TREE))
return -ENXIO;
rc = opal_get_device_tree(phandle, (uint64_t)buf, len);
if (rc < OPAL_SUCCESS)
return -EIO;
return rc;
}
EXPORT_SYMBOL_GPL(pnv_pci_get_device_tree);
int pnv_pci_get_presence_state(uint64_t id, uint8_t *state)
{
int64_t rc;
if (!opal_check_token(OPAL_PCI_GET_PRESENCE_STATE))
return -ENXIO;
rc = opal_pci_get_presence_state(id, (uint64_t)state);
if (rc != OPAL_SUCCESS)
return -EIO;
return 0;
}
EXPORT_SYMBOL_GPL(pnv_pci_get_presence_state);
int pnv_pci_get_power_state(uint64_t id, uint8_t *state)
{
int64_t rc;
if (!opal_check_token(OPAL_PCI_GET_POWER_STATE))
return -ENXIO;
rc = opal_pci_get_power_state(id, (uint64_t)state);
if (rc != OPAL_SUCCESS)
return -EIO;
return 0;
}
EXPORT_SYMBOL_GPL(pnv_pci_get_power_state);
int pnv_pci_set_power_state(uint64_t id, uint8_t state, struct opal_msg *msg)
{
struct opal_msg m;
int token, ret;
int64_t rc;
if (!opal_check_token(OPAL_PCI_SET_POWER_STATE))
return -ENXIO;
token = opal_async_get_token_interruptible();
if (unlikely(token < 0))
return token;
rc = opal_pci_set_power_state(token, id, (uint64_t)&state);
if (rc == OPAL_SUCCESS) {
ret = 0;
goto exit;
} else if (rc != OPAL_ASYNC_COMPLETION) {
ret = -EIO;
goto exit;
}
ret = opal_async_wait_response(token, &m);
if (ret < 0)
goto exit;
if (msg) {
ret = 1;
memcpy(msg, &m, sizeof(m));
}
exit:
opal_async_release_token(token);
return ret;
}
EXPORT_SYMBOL_GPL(pnv_pci_set_power_state);
#ifdef CONFIG_PCI_MSI
int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
struct pnv_phb *phb = hose->private_data;
struct msi_desc *entry;
struct msi_msg msg;
int hwirq;
unsigned int virq;
int rc;
if (WARN_ON(!phb) || !phb->msi_bmp.bitmap)
return -ENODEV;
if (pdev->no_64bit_msi && !phb->msi32_support)
return -ENODEV;
for_each_pci_msi_entry(entry, pdev) {
if (!entry->msi_attrib.is_64 && !phb->msi32_support) {
pr_warn("%s: Supports only 64-bit MSIs\n",
pci_name(pdev));
return -ENXIO;
}
hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, 1);
if (hwirq < 0) {
pr_warn("%s: Failed to find a free MSI\n",
pci_name(pdev));
return -ENOSPC;
}
virq = irq_create_mapping(NULL, phb->msi_base + hwirq);
if (!virq) {
pr_warn("%s: Failed to map MSI to linux irq\n",
pci_name(pdev));
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, 1);
return -ENOMEM;
}
rc = phb->msi_setup(phb, pdev, phb->msi_base + hwirq,
virq, entry->msi_attrib.is_64, &msg);
if (rc) {
pr_warn("%s: Failed to setup MSI\n", pci_name(pdev));
irq_dispose_mapping(virq);
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, 1);
return rc;
}
irq_set_msi_desc(virq, entry);
pci_write_msi_msg(virq, &msg);
}
return 0;
}
void pnv_teardown_msi_irqs(struct pci_dev *pdev)
{
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
struct pnv_phb *phb = hose->private_data;
struct msi_desc *entry;
irq_hw_number_t hwirq;
if (WARN_ON(!phb))
return;
for_each_pci_msi_entry(entry, pdev) {
if (!entry->irq)
continue;
hwirq = virq_to_hw(entry->irq);
irq_set_msi_desc(entry->irq, NULL);
irq_dispose_mapping(entry->irq);
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq - phb->msi_base, 1);
}
}
#endif /* CONFIG_PCI_MSI */
/* Nicely print the contents of the PE State Tables (PEST). */
static void pnv_pci_dump_pest(__be64 pestA[], __be64 pestB[], int pest_size)
{
__be64 prevA = ULONG_MAX, prevB = ULONG_MAX;
bool dup = false;
int i;
for (i = 0; i < pest_size; i++) {
__be64 peA = be64_to_cpu(pestA[i]);
__be64 peB = be64_to_cpu(pestB[i]);
if (peA != prevA || peB != prevB) {
if (dup) {
pr_info("PE[..%03x] A/B: as above\n", i-1);
dup = false;
}
prevA = peA;
prevB = peB;
if (peA & PNV_IODA_STOPPED_STATE ||
peB & PNV_IODA_STOPPED_STATE)
pr_info("PE[%03x] A/B: %016llx %016llx\n",
i, peA, peB);
} else if (!dup && (peA & PNV_IODA_STOPPED_STATE ||
peB & PNV_IODA_STOPPED_STATE)) {
dup = true;
}
}
}
static void pnv_pci_dump_p7ioc_diag_data(struct pci_controller *hose,
struct OpalIoPhbErrorCommon *common)
{
struct OpalIoP7IOCPhbErrorData *data;
data = (struct OpalIoP7IOCPhbErrorData *)common;
pr_info("P7IOC PHB#%x Diag-data (Version: %d)\n",
hose->global_number, be32_to_cpu(common->version));
if (data->brdgCtl)
pr_info("brdgCtl: %08x\n",
be32_to_cpu(data->brdgCtl));
if (data->portStatusReg || data->rootCmplxStatus ||
data->busAgentStatus)
pr_info("UtlSts: %08x %08x %08x\n",
be32_to_cpu(data->portStatusReg),
be32_to_cpu(data->rootCmplxStatus),
be32_to_cpu(data->busAgentStatus));
if (data->deviceStatus || data->slotStatus ||
data->linkStatus || data->devCmdStatus ||
data->devSecStatus)
pr_info("RootSts: %08x %08x %08x %08x %08x\n",
be32_to_cpu(data->deviceStatus),
be32_to_cpu(data->slotStatus),
be32_to_cpu(data->linkStatus),
be32_to_cpu(data->devCmdStatus),
be32_to_cpu(data->devSecStatus));
if (data->rootErrorStatus || data->uncorrErrorStatus ||
data->corrErrorStatus)
pr_info("RootErrSts: %08x %08x %08x\n",
be32_to_cpu(data->rootErrorStatus),
be32_to_cpu(data->uncorrErrorStatus),
be32_to_cpu(data->corrErrorStatus));
if (data->tlpHdr1 || data->tlpHdr2 ||
data->tlpHdr3 || data->tlpHdr4)
pr_info("RootErrLog: %08x %08x %08x %08x\n",
be32_to_cpu(data->tlpHdr1),
be32_to_cpu(data->tlpHdr2),
be32_to_cpu(data->tlpHdr3),
be32_to_cpu(data->tlpHdr4));
if (data->sourceId || data->errorClass ||
data->correlator)
pr_info("RootErrLog1: %08x %016llx %016llx\n",
be32_to_cpu(data->sourceId),
be64_to_cpu(data->errorClass),
be64_to_cpu(data->correlator));
if (data->p7iocPlssr || data->p7iocCsr)
pr_info("PhbSts: %016llx %016llx\n",
be64_to_cpu(data->p7iocPlssr),
be64_to_cpu(data->p7iocCsr));
if (data->lemFir)
pr_info("Lem: %016llx %016llx %016llx\n",
be64_to_cpu(data->lemFir),
be64_to_cpu(data->lemErrorMask),
be64_to_cpu(data->lemWOF));
if (data->phbErrorStatus)
pr_info("PhbErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbErrorStatus),
be64_to_cpu(data->phbFirstErrorStatus),
be64_to_cpu(data->phbErrorLog0),
be64_to_cpu(data->phbErrorLog1));
if (data->mmioErrorStatus)
pr_info("OutErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->mmioErrorStatus),
be64_to_cpu(data->mmioFirstErrorStatus),
be64_to_cpu(data->mmioErrorLog0),
be64_to_cpu(data->mmioErrorLog1));
if (data->dma0ErrorStatus)
pr_info("InAErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->dma0ErrorStatus),
be64_to_cpu(data->dma0FirstErrorStatus),
be64_to_cpu(data->dma0ErrorLog0),
be64_to_cpu(data->dma0ErrorLog1));
if (data->dma1ErrorStatus)
pr_info("InBErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->dma1ErrorStatus),
be64_to_cpu(data->dma1FirstErrorStatus),
be64_to_cpu(data->dma1ErrorLog0),
be64_to_cpu(data->dma1ErrorLog1));
pnv_pci_dump_pest(data->pestA, data->pestB, OPAL_P7IOC_NUM_PEST_REGS);
}
static void pnv_pci_dump_phb3_diag_data(struct pci_controller *hose,
struct OpalIoPhbErrorCommon *common)
{
struct OpalIoPhb3ErrorData *data;
data = (struct OpalIoPhb3ErrorData*)common;
pr_info("PHB3 PHB#%x Diag-data (Version: %d)\n",
hose->global_number, be32_to_cpu(common->version));
if (data->brdgCtl)
pr_info("brdgCtl: %08x\n",
be32_to_cpu(data->brdgCtl));
if (data->portStatusReg || data->rootCmplxStatus ||
data->busAgentStatus)
pr_info("UtlSts: %08x %08x %08x\n",
be32_to_cpu(data->portStatusReg),
be32_to_cpu(data->rootCmplxStatus),
be32_to_cpu(data->busAgentStatus));
if (data->deviceStatus || data->slotStatus ||
data->linkStatus || data->devCmdStatus ||
data->devSecStatus)
pr_info("RootSts: %08x %08x %08x %08x %08x\n",
be32_to_cpu(data->deviceStatus),
be32_to_cpu(data->slotStatus),
be32_to_cpu(data->linkStatus),
be32_to_cpu(data->devCmdStatus),
be32_to_cpu(data->devSecStatus));
if (data->rootErrorStatus || data->uncorrErrorStatus ||
data->corrErrorStatus)
pr_info("RootErrSts: %08x %08x %08x\n",
be32_to_cpu(data->rootErrorStatus),
be32_to_cpu(data->uncorrErrorStatus),
be32_to_cpu(data->corrErrorStatus));
if (data->tlpHdr1 || data->tlpHdr2 ||
data->tlpHdr3 || data->tlpHdr4)
pr_info("RootErrLog: %08x %08x %08x %08x\n",
be32_to_cpu(data->tlpHdr1),
be32_to_cpu(data->tlpHdr2),
be32_to_cpu(data->tlpHdr3),
be32_to_cpu(data->tlpHdr4));
if (data->sourceId || data->errorClass ||
data->correlator)
pr_info("RootErrLog1: %08x %016llx %016llx\n",
be32_to_cpu(data->sourceId),
be64_to_cpu(data->errorClass),
be64_to_cpu(data->correlator));
if (data->nFir)
pr_info("nFir: %016llx %016llx %016llx\n",
be64_to_cpu(data->nFir),
be64_to_cpu(data->nFirMask),
be64_to_cpu(data->nFirWOF));
if (data->phbPlssr || data->phbCsr)
pr_info("PhbSts: %016llx %016llx\n",
be64_to_cpu(data->phbPlssr),
be64_to_cpu(data->phbCsr));
if (data->lemFir)
pr_info("Lem: %016llx %016llx %016llx\n",
be64_to_cpu(data->lemFir),
be64_to_cpu(data->lemErrorMask),
be64_to_cpu(data->lemWOF));
if (data->phbErrorStatus)
pr_info("PhbErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbErrorStatus),
be64_to_cpu(data->phbFirstErrorStatus),
be64_to_cpu(data->phbErrorLog0),
be64_to_cpu(data->phbErrorLog1));
if (data->mmioErrorStatus)
pr_info("OutErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->mmioErrorStatus),
be64_to_cpu(data->mmioFirstErrorStatus),
be64_to_cpu(data->mmioErrorLog0),
be64_to_cpu(data->mmioErrorLog1));
if (data->dma0ErrorStatus)
pr_info("InAErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->dma0ErrorStatus),
be64_to_cpu(data->dma0FirstErrorStatus),
be64_to_cpu(data->dma0ErrorLog0),
be64_to_cpu(data->dma0ErrorLog1));
if (data->dma1ErrorStatus)
pr_info("InBErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->dma1ErrorStatus),
be64_to_cpu(data->dma1FirstErrorStatus),
be64_to_cpu(data->dma1ErrorLog0),
be64_to_cpu(data->dma1ErrorLog1));
pnv_pci_dump_pest(data->pestA, data->pestB, OPAL_PHB3_NUM_PEST_REGS);
}
static void pnv_pci_dump_phb4_diag_data(struct pci_controller *hose,
struct OpalIoPhbErrorCommon *common)
{
struct OpalIoPhb4ErrorData *data;
data = (struct OpalIoPhb4ErrorData*)common;
pr_info("PHB4 PHB#%d Diag-data (Version: %d)\n",
hose->global_number, be32_to_cpu(common->version));
if (data->brdgCtl)
pr_info("brdgCtl: %08x\n",
be32_to_cpu(data->brdgCtl));
if (data->deviceStatus || data->slotStatus ||
data->linkStatus || data->devCmdStatus ||
data->devSecStatus)
pr_info("RootSts: %08x %08x %08x %08x %08x\n",
be32_to_cpu(data->deviceStatus),
be32_to_cpu(data->slotStatus),
be32_to_cpu(data->linkStatus),
be32_to_cpu(data->devCmdStatus),
be32_to_cpu(data->devSecStatus));
if (data->rootErrorStatus || data->uncorrErrorStatus ||
data->corrErrorStatus)
pr_info("RootErrSts: %08x %08x %08x\n",
be32_to_cpu(data->rootErrorStatus),
be32_to_cpu(data->uncorrErrorStatus),
be32_to_cpu(data->corrErrorStatus));
if (data->tlpHdr1 || data->tlpHdr2 ||
data->tlpHdr3 || data->tlpHdr4)
pr_info("RootErrLog: %08x %08x %08x %08x\n",
be32_to_cpu(data->tlpHdr1),
be32_to_cpu(data->tlpHdr2),
be32_to_cpu(data->tlpHdr3),
be32_to_cpu(data->tlpHdr4));
if (data->sourceId)
pr_info("sourceId: %08x\n", be32_to_cpu(data->sourceId));
if (data->nFir)
pr_info("nFir: %016llx %016llx %016llx\n",
be64_to_cpu(data->nFir),
be64_to_cpu(data->nFirMask),
be64_to_cpu(data->nFirWOF));
if (data->phbPlssr || data->phbCsr)
pr_info("PhbSts: %016llx %016llx\n",
be64_to_cpu(data->phbPlssr),
be64_to_cpu(data->phbCsr));
if (data->lemFir)
pr_info("Lem: %016llx %016llx %016llx\n",
be64_to_cpu(data->lemFir),
be64_to_cpu(data->lemErrorMask),
be64_to_cpu(data->lemWOF));
if (data->phbErrorStatus)
pr_info("PhbErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbErrorStatus),
be64_to_cpu(data->phbFirstErrorStatus),
be64_to_cpu(data->phbErrorLog0),
be64_to_cpu(data->phbErrorLog1));
if (data->phbTxeErrorStatus)
pr_info("PhbTxeErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbTxeErrorStatus),
be64_to_cpu(data->phbTxeFirstErrorStatus),
be64_to_cpu(data->phbTxeErrorLog0),
be64_to_cpu(data->phbTxeErrorLog1));
if (data->phbRxeArbErrorStatus)
pr_info("RxeArbErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbRxeArbErrorStatus),
be64_to_cpu(data->phbRxeArbFirstErrorStatus),
be64_to_cpu(data->phbRxeArbErrorLog0),
be64_to_cpu(data->phbRxeArbErrorLog1));
if (data->phbRxeMrgErrorStatus)
pr_info("RxeMrgErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbRxeMrgErrorStatus),
be64_to_cpu(data->phbRxeMrgFirstErrorStatus),
be64_to_cpu(data->phbRxeMrgErrorLog0),
be64_to_cpu(data->phbRxeMrgErrorLog1));
if (data->phbRxeTceErrorStatus)
pr_info("RxeTceErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbRxeTceErrorStatus),
be64_to_cpu(data->phbRxeTceFirstErrorStatus),
be64_to_cpu(data->phbRxeTceErrorLog0),
be64_to_cpu(data->phbRxeTceErrorLog1));
if (data->phbPblErrorStatus)
pr_info("PblErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbPblErrorStatus),
be64_to_cpu(data->phbPblFirstErrorStatus),
be64_to_cpu(data->phbPblErrorLog0),
be64_to_cpu(data->phbPblErrorLog1));
if (data->phbPcieDlpErrorStatus)
pr_info("PcieDlp: %016llx %016llx %016llx\n",
be64_to_cpu(data->phbPcieDlpErrorLog1),
be64_to_cpu(data->phbPcieDlpErrorLog2),
be64_to_cpu(data->phbPcieDlpErrorStatus));
if (data->phbRegbErrorStatus)
pr_info("RegbErr: %016llx %016llx %016llx %016llx\n",
be64_to_cpu(data->phbRegbErrorStatus),
be64_to_cpu(data->phbRegbFirstErrorStatus),
be64_to_cpu(data->phbRegbErrorLog0),
be64_to_cpu(data->phbRegbErrorLog1));
pnv_pci_dump_pest(data->pestA, data->pestB, OPAL_PHB4_NUM_PEST_REGS);
}
void pnv_pci_dump_phb_diag_data(struct pci_controller *hose,
unsigned char *log_buff)
{
struct OpalIoPhbErrorCommon *common;
if (!hose || !log_buff)
return;
common = (struct OpalIoPhbErrorCommon *)log_buff;
switch (be32_to_cpu(common->ioType)) {
case OPAL_PHB_ERROR_DATA_TYPE_P7IOC:
pnv_pci_dump_p7ioc_diag_data(hose, common);
break;
case OPAL_PHB_ERROR_DATA_TYPE_PHB3:
pnv_pci_dump_phb3_diag_data(hose, common);
break;
case OPAL_PHB_ERROR_DATA_TYPE_PHB4:
pnv_pci_dump_phb4_diag_data(hose, common);
break;
default:
pr_warn("%s: Unrecognized ioType %d\n",
__func__, be32_to_cpu(common->ioType));
}
}
static void pnv_pci_handle_eeh_config(struct pnv_phb *phb, u32 pe_no)
{
unsigned long flags, rc;
int has_diag, ret = 0;
spin_lock_irqsave(&phb->lock, flags);
/* Fetch PHB diag-data */
rc = opal_pci_get_phb_diag_data2(phb->opal_id, phb->diag_data,
phb->diag_data_size);
has_diag = (rc == OPAL_SUCCESS);
/* If PHB supports compound PE, to handle it */
if (phb->unfreeze_pe) {
ret = phb->unfreeze_pe(phb,
pe_no,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
} else {
rc = opal_pci_eeh_freeze_clear(phb->opal_id,
pe_no,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
if (rc) {
pr_warn("%s: Failure %ld clearing frozen "
"PHB#%x-PE#%x\n",
__func__, rc, phb->hose->global_number,
pe_no);
ret = -EIO;
}
}
/*
* For now, let's only display the diag buffer when we fail to clear
* the EEH status. We'll do more sensible things later when we have
* proper EEH support. We need to make sure we don't pollute ourselves
* with the normal errors generated when probing empty slots
*/
if (has_diag && ret)
pnv_pci_dump_phb_diag_data(phb->hose, phb->diag_data);
spin_unlock_irqrestore(&phb->lock, flags);
}
static void pnv_pci_config_check_eeh(struct pci_dn *pdn)
{
struct pnv_phb *phb = pdn->phb->private_data;
u8 fstate;
__be16 pcierr;
unsigned int pe_no;
s64 rc;
/*
* Get the PE#. During the PCI probe stage, we might not
* setup that yet. So all ER errors should be mapped to
* reserved PE.
*/
pe_no = pdn->pe_number;
if (pe_no == IODA_INVALID_PE) {
pe_no = phb->ioda.reserved_pe_idx;
}
/*
* Fetch frozen state. If the PHB support compound PE,
* we need handle that case.
*/
if (phb->get_pe_state) {
fstate = phb->get_pe_state(phb, pe_no);
} else {
rc = opal_pci_eeh_freeze_status(phb->opal_id,
pe_no,
&fstate,
&pcierr,
NULL);
if (rc) {
pr_warn("%s: Failure %lld getting PHB#%x-PE#%x state\n",
__func__, rc, phb->hose->global_number, pe_no);
return;
}
}
pr_devel(" -> EEH check, bdfn=%04x PE#%x fstate=%x\n",
(pdn->busno << 8) | (pdn->devfn), pe_no, fstate);
/* Clear the frozen state if applicable */
if (fstate == OPAL_EEH_STOPPED_MMIO_FREEZE ||
fstate == OPAL_EEH_STOPPED_DMA_FREEZE ||
fstate == OPAL_EEH_STOPPED_MMIO_DMA_FREEZE) {
/*
* If PHB supports compound PE, freeze it for
* consistency.
*/
if (phb->freeze_pe)
phb->freeze_pe(phb, pe_no);
pnv_pci_handle_eeh_config(phb, pe_no);
}
}
int pnv_pci_cfg_read(struct pci_dn *pdn,
int where, int size, u32 *val)
{
struct pnv_phb *phb = pdn->phb->private_data;
u32 bdfn = (pdn->busno << 8) | pdn->devfn;
s64 rc;
switch (size) {
case 1: {
u8 v8;
rc = opal_pci_config_read_byte(phb->opal_id, bdfn, where, &v8);
*val = (rc == OPAL_SUCCESS) ? v8 : 0xff;
break;
}
case 2: {
__be16 v16;
rc = opal_pci_config_read_half_word(phb->opal_id, bdfn, where,
&v16);
*val = (rc == OPAL_SUCCESS) ? be16_to_cpu(v16) : 0xffff;
break;
}
case 4: {
__be32 v32;
rc = opal_pci_config_read_word(phb->opal_id, bdfn, where, &v32);
*val = (rc == OPAL_SUCCESS) ? be32_to_cpu(v32) : 0xffffffff;
break;
}
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
pr_devel("%s: bus: %x devfn: %x +%x/%x -> %08x\n",
__func__, pdn->busno, pdn->devfn, where, size, *val);
return PCIBIOS_SUCCESSFUL;
}
int pnv_pci_cfg_write(struct pci_dn *pdn,
int where, int size, u32 val)
{
struct pnv_phb *phb = pdn->phb->private_data;
u32 bdfn = (pdn->busno << 8) | pdn->devfn;
pr_devel("%s: bus: %x devfn: %x +%x/%x -> %08x\n",
__func__, pdn->busno, pdn->devfn, where, size, val);
switch (size) {
case 1:
opal_pci_config_write_byte(phb->opal_id, bdfn, where, val);
break;
case 2:
opal_pci_config_write_half_word(phb->opal_id, bdfn, where, val);
break;
case 4:
opal_pci_config_write_word(phb->opal_id, bdfn, where, val);
break;
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
return PCIBIOS_SUCCESSFUL;
}
#if CONFIG_EEH
static bool pnv_pci_cfg_check(struct pci_dn *pdn)
{
struct eeh_dev *edev = NULL;
struct pnv_phb *phb = pdn->phb->private_data;
/* EEH not enabled ? */
if (!(phb->flags & PNV_PHB_FLAG_EEH))
return true;
/* PE reset or device removed ? */
edev = pdn->edev;
if (edev) {
if (edev->pe &&
(edev->pe->state & EEH_PE_CFG_BLOCKED))
return false;
if (edev->mode & EEH_DEV_REMOVED)
return false;
}
return true;
}
#else
static inline pnv_pci_cfg_check(struct pci_dn *pdn)
{
return true;
}
#endif /* CONFIG_EEH */
static int pnv_pci_read_config(struct pci_bus *bus,
unsigned int devfn,
int where, int size, u32 *val)
{
struct pci_dn *pdn;
struct pnv_phb *phb;
int ret;
*val = 0xFFFFFFFF;
pdn = pci_get_pdn_by_devfn(bus, devfn);
if (!pdn)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!pnv_pci_cfg_check(pdn))
return PCIBIOS_DEVICE_NOT_FOUND;
ret = pnv_pci_cfg_read(pdn, where, size, val);
phb = pdn->phb->private_data;
if (phb->flags & PNV_PHB_FLAG_EEH && pdn->edev) {
if (*val == EEH_IO_ERROR_VALUE(size) &&
eeh_dev_check_failure(pdn->edev))
return PCIBIOS_DEVICE_NOT_FOUND;
} else {
pnv_pci_config_check_eeh(pdn);
}
return ret;
}
static int pnv_pci_write_config(struct pci_bus *bus,
unsigned int devfn,
int where, int size, u32 val)
{
struct pci_dn *pdn;
struct pnv_phb *phb;
int ret;
pdn = pci_get_pdn_by_devfn(bus, devfn);
if (!pdn)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!pnv_pci_cfg_check(pdn))
return PCIBIOS_DEVICE_NOT_FOUND;
ret = pnv_pci_cfg_write(pdn, where, size, val);
phb = pdn->phb->private_data;
if (!(phb->flags & PNV_PHB_FLAG_EEH))
pnv_pci_config_check_eeh(pdn);
return ret;
}
struct pci_ops pnv_pci_ops = {
.read = pnv_pci_read_config,
.write = pnv_pci_write_config,
};
static __be64 *pnv_tce(struct iommu_table *tbl, long idx)
{
__be64 *tmp = ((__be64 *)tbl->it_base);
int level = tbl->it_indirect_levels;
const long shift = ilog2(tbl->it_level_size);
unsigned long mask = (tbl->it_level_size - 1) << (level * shift);
while (level) {
int n = (idx & mask) >> (level * shift);
unsigned long tce = be64_to_cpu(tmp[n]);
tmp = __va(tce & ~(TCE_PCI_READ | TCE_PCI_WRITE));
idx &= ~mask;
mask >>= shift;
--level;
}
return tmp + idx;
}
int pnv_tce_build(struct iommu_table *tbl, long index, long npages,
unsigned long uaddr, enum dma_data_direction direction,
unsigned long attrs)
{
u64 proto_tce = iommu_direction_to_tce_perm(direction);
u64 rpn = __pa(uaddr) >> tbl->it_page_shift;
long i;
if (proto_tce & TCE_PCI_WRITE)
proto_tce |= TCE_PCI_READ;
for (i = 0; i < npages; i++) {
unsigned long newtce = proto_tce |
((rpn + i) << tbl->it_page_shift);
unsigned long idx = index - tbl->it_offset + i;
*(pnv_tce(tbl, idx)) = cpu_to_be64(newtce);
}
return 0;
}
#ifdef CONFIG_IOMMU_API
int pnv_tce_xchg(struct iommu_table *tbl, long index,
unsigned long *hpa, enum dma_data_direction *direction)
{
u64 proto_tce = iommu_direction_to_tce_perm(*direction);
unsigned long newtce = *hpa | proto_tce, oldtce;
unsigned long idx = index - tbl->it_offset;
BUG_ON(*hpa & ~IOMMU_PAGE_MASK(tbl));
if (newtce & TCE_PCI_WRITE)
newtce |= TCE_PCI_READ;
oldtce = be64_to_cpu(xchg(pnv_tce(tbl, idx), cpu_to_be64(newtce)));
*hpa = oldtce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
*direction = iommu_tce_direction(oldtce);
return 0;
}
#endif
void pnv_tce_free(struct iommu_table *tbl, long index, long npages)
{
long i;
for (i = 0; i < npages; i++) {
unsigned long idx = index - tbl->it_offset + i;
*(pnv_tce(tbl, idx)) = cpu_to_be64(0);
}
}
unsigned long pnv_tce_get(struct iommu_table *tbl, long index)
{
return be64_to_cpu(*(pnv_tce(tbl, index - tbl->it_offset)));
}
struct iommu_table *pnv_pci_table_alloc(int nid)
{
struct iommu_table *tbl;
tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, nid);
if (!tbl)
return NULL;
INIT_LIST_HEAD_RCU(&tbl->it_group_list);
kref_init(&tbl->it_kref);
return tbl;
}
long pnv_pci_link_table_and_group(int node, int num,
struct iommu_table *tbl,
struct iommu_table_group *table_group)
{
struct iommu_table_group_link *tgl = NULL;
if (WARN_ON(!tbl || !table_group))
return -EINVAL;
tgl = kzalloc_node(sizeof(struct iommu_table_group_link), GFP_KERNEL,
node);
if (!tgl)
return -ENOMEM;
tgl->table_group = table_group;
list_add_rcu(&tgl->next, &tbl->it_group_list);
table_group->tables[num] = tbl;
return 0;
}
static void pnv_iommu_table_group_link_free(struct rcu_head *head)
{
struct iommu_table_group_link *tgl = container_of(head,
struct iommu_table_group_link, rcu);
kfree(tgl);
}
void pnv_pci_unlink_table_and_group(struct iommu_table *tbl,
struct iommu_table_group *table_group)
{
long i;
bool found;
struct iommu_table_group_link *tgl;
if (!tbl || !table_group)
return;
/* Remove link to a group from table's list of attached groups */
found = false;
list_for_each_entry_rcu(tgl, &tbl->it_group_list, next) {
if (tgl->table_group == table_group) {
list_del_rcu(&tgl->next);
call_rcu(&tgl->rcu, pnv_iommu_table_group_link_free);
found = true;
break;
}
}
if (WARN_ON(!found))
return;
/* Clean a pointer to iommu_table in iommu_table_group::tables[] */
found = false;
for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
if (table_group->tables[i] == tbl) {
table_group->tables[i] = NULL;
found = true;
break;
}
}
WARN_ON(!found);
}
void pnv_pci_setup_iommu_table(struct iommu_table *tbl,
void *tce_mem, u64 tce_size,
u64 dma_offset, unsigned page_shift)
{
tbl->it_blocksize = 16;
tbl->it_base = (unsigned long)tce_mem;
tbl->it_page_shift = page_shift;
tbl->it_offset = dma_offset >> tbl->it_page_shift;
tbl->it_index = 0;
tbl->it_size = tce_size >> 3;
tbl->it_busno = 0;
tbl->it_type = TCE_PCI;
}
void pnv_pci_dma_dev_setup(struct pci_dev *pdev)
{
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
struct pnv_phb *phb = hose->private_data;
#ifdef CONFIG_PCI_IOV
struct pnv_ioda_pe *pe;
struct pci_dn *pdn;
/* Fix the VF pdn PE number */
if (pdev->is_virtfn) {
pdn = pci_get_pdn(pdev);
WARN_ON(pdn->pe_number != IODA_INVALID_PE);
list_for_each_entry(pe, &phb->ioda.pe_list, list) {
if (pe->rid == ((pdev->bus->number << 8) |
(pdev->devfn & 0xff))) {
pdn->pe_number = pe->pe_number;
pe->pdev = pdev;
break;
}
}
}
#endif /* CONFIG_PCI_IOV */
if (phb && phb->dma_dev_setup)
phb->dma_dev_setup(phb, pdev);
}
void pnv_pci_dma_bus_setup(struct pci_bus *bus)
{
struct pci_controller *hose = bus->sysdata;
struct pnv_phb *phb = hose->private_data;
struct pnv_ioda_pe *pe;
list_for_each_entry(pe, &phb->ioda.pe_list, list) {
if (!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)))
continue;
if (!pe->pbus)
continue;
if (bus->number == ((pe->rid >> 8) & 0xFF)) {
pe->pbus = bus;
break;
}
}
}
int pnv_pci_set_p2p(struct pci_dev *initiator, struct pci_dev *target, u64 desc)
{
struct pci_controller *hose;
struct pnv_phb *phb_init, *phb_target;
struct pnv_ioda_pe *pe_init;
int rc;
if (!opal_check_token(OPAL_PCI_SET_P2P))
return -ENXIO;
hose = pci_bus_to_host(initiator->bus);
phb_init = hose->private_data;
hose = pci_bus_to_host(target->bus);
phb_target = hose->private_data;
pe_init = pnv_ioda_get_pe(initiator);
if (!pe_init)
return -ENODEV;
/*
* Configuring the initiator's PHB requires to adjust its
* TVE#1 setting. Since the same device can be an initiator
* several times for different target devices, we need to keep
* a reference count to know when we can restore the default
* bypass setting on its TVE#1 when disabling. Opal is not
* tracking PE states, so we add a reference count on the PE
* in linux.
*
* For the target, the configuration is per PHB, so we keep a
* target reference count on the PHB.
*/
mutex_lock(&p2p_mutex);
if (desc & OPAL_PCI_P2P_ENABLE) {
/* always go to opal to validate the configuration */
rc = opal_pci_set_p2p(phb_init->opal_id, phb_target->opal_id,
desc, pe_init->pe_number);
if (rc != OPAL_SUCCESS) {
rc = -EIO;
goto out;
}
pe_init->p2p_initiator_count++;
phb_target->p2p_target_count++;
} else {
if (!pe_init->p2p_initiator_count ||
!phb_target->p2p_target_count) {
rc = -EINVAL;
goto out;
}
if (--pe_init->p2p_initiator_count == 0)
pnv_pci_ioda2_set_bypass(pe_init, true);
if (--phb_target->p2p_target_count == 0) {
rc = opal_pci_set_p2p(phb_init->opal_id,
phb_target->opal_id, desc,
pe_init->pe_number);
if (rc != OPAL_SUCCESS) {
rc = -EIO;
goto out;
}
}
}
rc = 0;
out:
mutex_unlock(&p2p_mutex);
return rc;
}
EXPORT_SYMBOL_GPL(pnv_pci_set_p2p);
void pnv_pci_shutdown(void)
{
struct pci_controller *hose;
list_for_each_entry(hose, &hose_list, list_node)
if (hose->controller_ops.shutdown)
hose->controller_ops.shutdown(hose);
}
/* Fixup wrong class code in p7ioc and p8 root complex */
static void pnv_p7ioc_rc_quirk(struct pci_dev *dev)
{
dev->class = PCI_CLASS_BRIDGE_PCI << 8;
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_IBM, 0x3b9, pnv_p7ioc_rc_quirk);
void __init pnv_pci_init(void)
{
struct device_node *np;
pci_add_flags(PCI_CAN_SKIP_ISA_ALIGN);
/* If we don't have OPAL, eg. in sim, just skip PCI probe */
if (!firmware_has_feature(FW_FEATURE_OPAL))
return;
/* Look for IODA IO-Hubs. */
for_each_compatible_node(np, NULL, "ibm,ioda-hub") {
pnv_pci_init_ioda_hub(np);
}
/* Look for ioda2 built-in PHB3's */
for_each_compatible_node(np, NULL, "ibm,ioda2-phb")
pnv_pci_init_ioda2_phb(np);
/* Look for ioda3 built-in PHB4's, we treat them as IODA2 */
for_each_compatible_node(np, NULL, "ibm,ioda3-phb")
pnv_pci_init_ioda2_phb(np);
/* Look for NPU PHBs */
for_each_compatible_node(np, NULL, "ibm,ioda2-npu-phb")
pnv_pci_init_npu_phb(np);
/*
* Look for NPU2 PHBs which we treat mostly as NPU PHBs with
* the exception of TCE kill which requires an OPAL call.
*/
for_each_compatible_node(np, NULL, "ibm,ioda2-npu2-phb")
pnv_pci_init_npu_phb(np);
/* Configure IOMMU DMA hooks */
set_pci_dma_ops(&dma_iommu_ops);
}
machine_subsys_initcall_sync(powernv, tce_iommu_bus_notifier_init);
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