On 23/08/17 20:19, Alexey Kardashevskiy wrote:
The eeh_dev struct hold a config space address of an associated node
and the very same address is also stored in the pci_dn struct which
is always present during the eeh_dev lifetime.

This uses bus:devfn directly from pci_dn instead of cached and packed
config_addr.

Since config_addr is made from device's bus:dev.fn, there is no point
in keeping it in the debugfs either so remove that too.

Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>

Reviewed-by: Andrew Donnellan <andrew.donnel...@au1.ibm.com>

---
  arch/powerpc/include/asm/eeh.h               |  1 -
  arch/powerpc/kernel/eeh_pe.c                 | 42 ++++++++++++++--------------
  arch/powerpc/kernel/eeh_sysfs.c              |  3 --
  arch/powerpc/platforms/powernv/eeh-powernv.c |  9 +++---
  4 files changed, 26 insertions(+), 29 deletions(-)

diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index 777d37aa0a7f..9847ae3a12d1 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -131,7 +131,6 @@ static inline bool eeh_pe_passed(struct eeh_pe *pe)
  struct eeh_dev {
        int mode;                       /* EEH mode                     */
        int class_code;                 /* Class code of the device     */
-       int config_addr;                /* Config address               */
        int pe_config_addr;             /* PE config address            */
        u32 config_space[16];           /* Saved PCI config space       */
        int pcix_cap;                   /* Saved PCIx capability        */
diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
index 419c3f07afd5..2e8d1b2b5af4 100644
--- a/arch/powerpc/kernel/eeh_pe.c
+++ b/arch/powerpc/kernel/eeh_pe.c
@@ -340,11 +340,12 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
  {
        struct eeh_pe *pe, *parent;
        struct pci_dn *pdn = eeh_dev_to_pdn(edev);
+       int config_addr = (pdn->busno << 8) | (pdn->devfn);
/* Check if the PE number is valid */
        if (!eeh_has_flag(EEH_VALID_PE_ZERO) && !edev->pe_config_addr) {
                pr_err("%s: Invalid PE#0 for edev 0x%x on PHB#%x\n",
-                      __func__, edev->config_addr, pdn->phb->global_number);
+                      __func__, config_addr, pdn->phb->global_number);
                return -EINVAL;
        }
@@ -354,8 +355,7 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
         * PE should be composed of PCI bus and its subordinate
         * components.
         */
-       pe = eeh_pe_get(pdn->phb, edev->pe_config_addr,
-                       edev->config_addr);
+       pe = eeh_pe_get(pdn->phb, edev->pe_config_addr, config_addr);
        if (pe && !(pe->type & EEH_PE_INVALID)) {
                /* Mark the PE as type of PCI bus */
                pe->type = EEH_PE_BUS;
@@ -365,10 +365,10 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
                list_add_tail(&edev->list, &pe->edevs);
                pr_debug("EEH: Add %04x:%02x:%02x.%01x to Bus PE#%x\n",
                         pdn->phb->global_number,
-                       edev->config_addr >> 8,
-                       PCI_SLOT(edev->config_addr & 0xFF),
-                       PCI_FUNC(edev->config_addr & 0xFF),
-                       pe->addr);
+                        pdn->busno,
+                        PCI_SLOT(pdn->devfn),
+                        PCI_FUNC(pdn->devfn),
+                        pe->addr);
                return 0;
        } else if (pe && (pe->type & EEH_PE_INVALID)) {
                list_add_tail(&edev->list, &pe->edevs);
@@ -388,10 +388,10 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
                pr_debug("EEH: Add %04x:%02x:%02x.%01x to Device "
                         "PE#%x, Parent PE#%x\n",
                         pdn->phb->global_number,
-                       edev->config_addr >> 8,
-                        PCI_SLOT(edev->config_addr & 0xFF),
-                        PCI_FUNC(edev->config_addr & 0xFF),
-                       pe->addr, pe->parent->addr);
+                        pdn->busno,
+                        PCI_SLOT(pdn->devfn),
+                        PCI_FUNC(pdn->devfn),
+                        pe->addr, pe->parent->addr);
                return 0;
        }
@@ -405,7 +405,7 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
                return -ENOMEM;
        }
        pe->addr     = edev->pe_config_addr;
-       pe->config_addr      = edev->config_addr;
+       pe->config_addr      = config_addr;
/*
         * Put the new EEH PE into hierarchy tree. If the parent
@@ -436,9 +436,9 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
        pr_debug("EEH: Add %04x:%02x:%02x.%01x to "
                 "Device PE#%x, Parent PE#%x\n",
                 pdn->phb->global_number,
-                edev->config_addr >> 8,
-                PCI_SLOT(edev->config_addr & 0xFF),
-                PCI_FUNC(edev->config_addr & 0xFF),
+                pdn->busno,
+                PCI_SLOT(pdn->devfn),
+                PCI_FUNC(pdn->devfn),
                 pe->addr, pe->parent->addr);
return 0;
@@ -462,9 +462,9 @@ int eeh_rmv_from_parent_pe(struct eeh_dev *edev)
        if (!edev->pe) {
                pr_debug("%s: No PE found for device %04x:%02x:%02x.%01x\n",
                         __func__,  pdn->phb->global_number,
-                        edev->config_addr >> 8,
-                        PCI_SLOT(edev->config_addr & 0xFF),
-                        PCI_FUNC(edev->config_addr & 0xFF));
+                        pdn->busno,
+                        PCI_SLOT(pdn->devfn),
+                        PCI_FUNC(pdn->devfn));
                return -EEXIST;
        }
@@ -725,9 +725,9 @@ static void eeh_bridge_check_link(struct eeh_dev *edev) pr_debug("%s: Check PCIe link for %04x:%02x:%02x.%01x ...\n",
                 __func__, pdn->phb->global_number,
-                edev->config_addr >> 8,
-                PCI_SLOT(edev->config_addr & 0xFF),
-                PCI_FUNC(edev->config_addr & 0xFF));
+                pdn->busno,
+                PCI_SLOT(pdn->devfn),
+                PCI_FUNC(pdn->devfn));
/* Check slot status */
        cap = edev->pcie_cap;
diff --git a/arch/powerpc/kernel/eeh_sysfs.c b/arch/powerpc/kernel/eeh_sysfs.c
index 1ceecdda810b..797549289798 100644
--- a/arch/powerpc/kernel/eeh_sysfs.c
+++ b/arch/powerpc/kernel/eeh_sysfs.c
@@ -51,7 +51,6 @@ static ssize_t eeh_show_##_name(struct device *dev,      \
  static DEVICE_ATTR(_name, S_IRUGO, eeh_show_##_name, NULL);
EEH_SHOW_ATTR(eeh_mode, mode, "0x%x");
-EEH_SHOW_ATTR(eeh_config_addr,     config_addr,     "0x%x");
  EEH_SHOW_ATTR(eeh_pe_config_addr,  pe_config_addr,  "0x%x");
static ssize_t eeh_pe_state_show(struct device *dev,
@@ -103,7 +102,6 @@ void eeh_sysfs_add_device(struct pci_dev *pdev)
                return;
rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
-       rc += device_create_file(&pdev->dev, &dev_attr_eeh_config_addr);
        rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
        rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
@@ -128,7 +126,6 @@ void eeh_sysfs_remove_device(struct pci_dev *pdev)
        }
device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
-       device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
        device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
        device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 552b0cd4e8ba..8864065eba22 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -352,6 +352,7 @@ static void *pnv_eeh_probe(struct pci_dn *pdn, void *data)
        struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
        uint32_t pcie_flags;
        int ret;
+       int config_addr = (pdn->busno << 8) | (pdn->devfn);
/*
         * When probing the root bridge, which doesn't have any
@@ -386,8 +387,7 @@ static void *pnv_eeh_probe(struct pci_dn *pdn, void *data)
                }
        }
- edev->config_addr = (pdn->busno << 8) | (pdn->devfn);
-       edev->pe_config_addr = phb->ioda.pe_rmap[edev->config_addr];
+       edev->pe_config_addr = phb->ioda.pe_rmap[config_addr];
/* Create PE */
        ret = eeh_add_to_parent_pe(edev);
@@ -1699,6 +1699,7 @@ static int pnv_eeh_restore_config(struct pci_dn *pdn)
        struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
        struct pnv_phb *phb;
        s64 ret;
+       int config_addr = (pdn->busno << 8) | (pdn->devfn);
if (!edev)
                return -EEXIST;
@@ -1715,12 +1716,12 @@ static int pnv_eeh_restore_config(struct pci_dn *pdn)
        } else {
                phb = pdn->phb->private_data;
                ret = opal_pci_reinit(phb->opal_id,
-                                     OPAL_REINIT_PCI_DEV, edev->config_addr);
+                                     OPAL_REINIT_PCI_DEV, config_addr);
        }
if (ret) {
                pr_warn("%s: Can't reinit PCI dev 0x%x (%lld)\n",
-                       __func__, edev->config_addr, ret);
+                       __func__, config_addr, ret);
                return -EIO;
        }

--
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnel...@au1.ibm.com  IBM Australia Limited

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