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powerpc/pseries/eeh: Clean up pe_config_addr lookups

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De-duplicate, and fix up the comments, and make the prototype just take a
pci_dn since the job of the function is to return the pe_config_addr of the
PE which contains a given device.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200918093050.37344-6-oohall@gmail.com
This commit is contained in:
Oliver O'Halloran 2020-09-18 19:30:47 +10:00 committed by Michael Ellerman
parent 395ee2a2a1
commit f61c859feb
1 changed files with 11 additions and 69 deletions
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80
arch/powerpc/platforms/pseries/eeh_pseries.c
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@ -33,8 +33,6 @@
#include <asm/ppc-pci.h>
#include <asm/rtas.h>
static int pseries_eeh_get_pe_addr(struct pci_dn *pdn);
/* RTAS tokens */
static int ibm_set_eeh_option;
static int ibm_set_slot_reset;
@ -86,7 +84,8 @@ void pseries_pcibios_bus_add_device(struct pci_dev *pdev)
/**
* pseries_eeh_get_config_addr - Retrieve config address
* pseries_eeh_get_pe_config_addr - Find the pe_config_addr for a device
* @pdn: pci_dn of the input device
*
* Retrieve the assocated config address. Actually, there're 2 RTAS
* function calls dedicated for the purpose. We need implement
@ -97,16 +96,17 @@ void pseries_pcibios_bus_add_device(struct pci_dev *pdev)
* It's notable that zero'ed return value means invalid PE config
* address.
*/
static int pseries_eeh_get_config_addr(struct pci_controller *phb, int config_addr)
static int pseries_eeh_get_pe_config_addr(struct pci_dn *pdn)
{
int config_addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);
struct pci_controller *phb = pdn->phb;
int ret = 0;
int rets[3];
if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) {
/*
* First of all, we need to make sure there has one PE
* associated with the device. Otherwise, PE address is
* meaningless.
* First of all, use function 1 to determine if this device is
* part of a PE or not. ret[0] being zero indicates it's not.
*/
ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
config_addr, BUID_HI(phb->buid),
@ -429,7 +429,7 @@ void pseries_eeh_init_edev(struct pci_dn *pdn)
struct eeh_pe *parent;
/* Retrieve PE address */
edev->pe_config_addr = pseries_eeh_get_pe_addr(pdn);
edev->pe_config_addr = pseries_eeh_get_pe_config_addr(pdn);
pe.addr = edev->pe_config_addr;
/* Some older systems (Power4) allow the ibm,set-eeh-option
@ -548,64 +548,6 @@ static int pseries_eeh_set_option(struct eeh_pe *pe, int option)
return ret;
}
/**
* pseries_eeh_get_pe_addr - Retrieve PE address
* @pe: EEH PE
*
* Retrieve the assocated PE address. Actually, there're 2 RTAS
* function calls dedicated for the purpose. We need implement
* it through the new function and then the old one. Besides,
* you should make sure the config address is figured out from
* FDT node before calling the function.
*
* It's notable that zero'ed return value means invalid PE config
* address.
*/
static int pseries_eeh_get_pe_addr(struct pci_dn *pdn)
{
int config_addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);
unsigned long buid = pdn->phb->buid;
int ret = 0;
int rets[3];
if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) {
/*
* First of all, we need to make sure there has one PE
* associated with the device. Otherwise, PE address is
* meaningless.
*/
ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
config_addr, BUID_HI(buid), BUID_LO(buid), 1);
if (ret || (rets[0] == 0))
return 0;
/* Retrieve the associated PE config address */
ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
config_addr, BUID_HI(buid), BUID_LO(buid), 0);
if (ret) {
pr_warn("%s: Failed to get address for PHB#%x-PE#%x\n",
__func__, pdn->phb->global_number, config_addr);
return 0;
}
return rets[0];
}
if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
ret = rtas_call(ibm_get_config_addr_info, 4, 2, rets,
config_addr, BUID_HI(buid), BUID_LO(buid), 0);
if (ret) {
pr_warn("%s: Failed to get address for PHB#%x-PE#%x\n",
__func__, pdn->phb->global_number, config_addr);
return 0;
}
return rets[0];
}
return ret;
}
/**
* pseries_eeh_get_state - Retrieve PE state
* @pe: EEH PE
@ -907,7 +849,7 @@ static int __init eeh_pseries_init(void)
{
struct pci_controller *phb;
struct pci_dn *pdn;
int ret, addr, config_addr;
int ret, config_addr;
/* figure out EEH RTAS function call tokens */
ibm_set_eeh_option = rtas_token("ibm,set-eeh-option");
@ -965,8 +907,8 @@ static int __init eeh_pseries_init(void)
pr_info("Issue PHB reset ...\n");
list_for_each_entry(phb, &hose_list, list_node) {
pdn = list_first_entry(&PCI_DN(phb->dn)->child_list, struct pci_dn, list);
addr = (pdn->busno << 16) | (pdn->devfn << 8);
config_addr = pseries_eeh_get_config_addr(phb, addr);
config_addr = pseries_eeh_get_pe_config_addr(pdn);
/* invalid PE config addr */
if (config_addr == 0)
continue;