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powerpc/eeh: Do reset based on PE

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The patch implements reset based on PE instead of eeh device. Also,
The functions used to retrieve the reset type, either hot or fundamental
reset, have been reworked for a little bit. More specificly, it's
implemented based the the eeh device traverse function.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2012-09-07 22:44:17 +00:00 committed by Benjamin Herrenschmidt
parent ff477966c6
commit c270a24c59
2 changed files with 35 additions and 58 deletions
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2
arch/powerpc/include/asm/ppc-pci.h
View File

@ -53,7 +53,7 @@ void pci_addr_cache_remove_device(struct pci_dev *dev);
struct pci_dev *pci_addr_cache_get_device(unsigned long addr);
void eeh_slot_error_detail(struct eeh_pe *pe, int severity);
int eeh_pci_enable(struct eeh_pe *pe, int function);
int eeh_reset_pe(struct eeh_dev *);
int eeh_reset_pe(struct eeh_pe *);
int rtas_write_config(struct pci_dn *, int where, int size, u32 val);
int rtas_read_config(struct pci_dn *, int where, int size, u32 *val);
void eeh_pe_state_mark(struct eeh_pe *pe, int state);

91
arch/powerpc/platforms/pseries/eeh.c
View File

@ -455,17 +455,24 @@ int eeh_pci_enable(struct eeh_pe *pe, int function)
*/
int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
{
struct device_node *dn = pci_device_to_OF_node(dev);
struct eeh_dev *edev = pci_dev_to_eeh_dev(dev);
struct eeh_pe *pe = edev->pe;
if (!pe) {
pr_err("%s: No PE found on PCI device %s\n",
__func__, pci_name(dev));
return -EINVAL;
}
switch (state) {
case pcie_deassert_reset:
eeh_ops->reset(dn, EEH_RESET_DEACTIVATE);
eeh_ops->reset(pe, EEH_RESET_DEACTIVATE);
break;
case pcie_hot_reset:
eeh_ops->reset(dn, EEH_RESET_HOT);
eeh_ops->reset(pe, EEH_RESET_HOT);
break;
case pcie_warm_reset:
eeh_ops->reset(dn, EEH_RESET_FUNDAMENTAL);
eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL);
break;
default:
return -EINVAL;
@ -475,66 +482,37 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat
}
/**
* __eeh_set_pe_freset - Check the required reset for child devices
* @parent: parent device
* @freset: return value
*
* Each device might have its preferred reset type: fundamental or
* hot reset. The routine is used to collect the information from
* the child devices so that they could be reset accordingly.
*/
void __eeh_set_pe_freset(struct device_node *parent, unsigned int *freset)
{
struct device_node *dn;
for_each_child_of_node(parent, dn) {
if (of_node_to_eeh_dev(dn)) {
struct pci_dev *dev = of_node_to_eeh_dev(dn)->pdev;
if (dev && dev->driver)
*freset |= dev->needs_freset;
__eeh_set_pe_freset(dn, freset);
}
}
}
/**
* eeh_set_pe_freset - Check the required reset for the indicated device and its children
* @dn: parent device
* @freset: return value
* eeh_set_pe_freset - Check the required reset for the indicated device
* @data: EEH device
* @flag: return value
*
* Each device might have its preferred reset type: fundamental or
* hot reset. The routine is used to collected the information for
* the indicated device and its children so that the bunch of the
* devices could be reset properly.
*/
void eeh_set_pe_freset(struct device_node *dn, unsigned int *freset)
static void *eeh_set_dev_freset(void *data, void *flag)
{
struct pci_dev *dev;
dn = eeh_find_device_pe(dn);
unsigned int *freset = (unsigned int *)flag;
struct eeh_dev *edev = (struct eeh_dev *)data;
/* Back up one, since config addrs might be shared */
if (!pcibios_find_pci_bus(dn) && of_node_to_eeh_dev(dn->parent))
dn = dn->parent;
dev = of_node_to_eeh_dev(dn)->pdev;
dev = eeh_dev_to_pci_dev(edev);
if (dev)
*freset |= dev->needs_freset;
__eeh_set_pe_freset(dn, freset);
return NULL;
}
/**
* eeh_reset_pe_once - Assert the pci #RST line for 1/4 second
* @edev: pci device node to be reset.
* @pe: EEH PE
*
* Assert the PCI #RST line for 1/4 second.
*/
static void eeh_reset_pe_once(struct eeh_dev *edev)
static void eeh_reset_pe_once(struct eeh_pe *pe)
{
unsigned int freset = 0;
struct device_node *dn = eeh_dev_to_of_node(edev);
/* Determine type of EEH reset required for
* Partitionable Endpoint, a hot-reset (1)
@ -542,12 +520,12 @@ static void eeh_reset_pe_once(struct eeh_dev *edev)
* A fundamental reset required by any device under
* Partitionable Endpoint trumps hot-reset.
*/
eeh_set_pe_freset(dn, &freset);
eeh_pe_dev_traverse(pe, eeh_set_dev_freset, &freset);
if (freset)
eeh_ops->reset(dn, EEH_RESET_FUNDAMENTAL);
eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL);
else
eeh_ops->reset(dn, EEH_RESET_HOT);
eeh_ops->reset(pe, EEH_RESET_HOT);
/* The PCI bus requires that the reset be held high for at least
* a 100 milliseconds. We wait a bit longer 'just in case'.
@ -559,9 +537,9 @@ static void eeh_reset_pe_once(struct eeh_dev *edev)
* pci slot reset line is dropped. Make sure we don't miss
* these, and clear the flag now.
*/
eeh_clear_slot(dn, EEH_MODE_ISOLATED);
eeh_pe_state_clear(pe, EEH_MODE_ISOLATED);
eeh_ops->reset(dn, EEH_RESET_DEACTIVATE);
eeh_ops->reset(pe, EEH_RESET_DEACTIVATE);
/* After a PCI slot has been reset, the PCI Express spec requires
* a 1.5 second idle time for the bus to stabilize, before starting
@ -573,32 +551,31 @@ static void eeh_reset_pe_once(struct eeh_dev *edev)
/**
* eeh_reset_pe - Reset the indicated PE
* @edev: PCI device associated EEH device
* @pe: EEH PE
*
* This routine should be called to reset indicated device, including
* PE. A PE might include multiple PCI devices and sometimes PCI bridges
* might be involved as well.
*/
int eeh_reset_pe(struct eeh_dev *edev)
int eeh_reset_pe(struct eeh_pe *pe)
{
int i, rc;
struct device_node *dn = eeh_dev_to_of_node(edev);
/* Take three shots at resetting the bus */
for (i=0; i<3; i++) {
eeh_reset_pe_once(edev);
eeh_reset_pe_once(pe);
rc = eeh_ops->wait_state(dn, PCI_BUS_RESET_WAIT_MSEC);
rc = eeh_ops->wait_state(pe, PCI_BUS_RESET_WAIT_MSEC);
if (rc == (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE))
return 0;
if (rc < 0) {
printk(KERN_ERR "EEH: unrecoverable slot failure %s\n",
dn->full_name);
pr_err("%s: Unrecoverable slot failure on PHB#%d-PE#%x",
__func__, pe->phb->global_number, pe->addr);
return -1;
}
printk(KERN_ERR "EEH: bus reset %d failed on slot %s, rc=%d\n",
i+1, dn->full_name, rc);
pr_err("EEH: bus reset %d failed on PHB#%d-PE#%x, rc=%d\n",
i+1, pe->phb->global_number, pe->addr, rc);
}
return -1;