PCI: aerdrv: rework aer_isr_one_error()
Divide tricky for-loop into readable if-blocks. The logic to set multi_error_valid (to force walking pci bus hierarchy to find 2nd~ error devices) is changed too, to check MULTI_{,_UN}COR_RCV bit individually and to force walk only when it is required. And rework setting e_info->severity for uncorrectable, not to use magic numbers. Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Reviewed-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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@ -208,6 +208,9 @@ static int find_device_iter(struct pci_dev *dev, void *data)
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* Return true if found.
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*
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* Invoked by DPC when error is detected at the Root Port.
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* Caller of this function must set id, severity, and multi_error_valid of
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* struct aer_err_info pointed by @e_info properly. This function must fill
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* e_info->error_dev_num and e_info->dev[], based on the given information.
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*/
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static bool find_source_device(struct pci_dev *parent,
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struct aer_err_info *e_info)
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@ -215,6 +218,9 @@ static bool find_source_device(struct pci_dev *parent,
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struct pci_dev *dev = parent;
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int result;
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/* Must reset in this function */
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e_info->error_dev_num = 0;
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/* Is Root Port an agent that sends error message? */
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result = find_device_iter(dev, e_info);
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if (result)
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@ -580,11 +586,14 @@ static struct aer_err_source *get_e_source(struct aer_rpc *rpc)
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* @info: pointer to structure to store the error record
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*
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* Return 1 on success, 0 on error.
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*
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* Note that @info is reused among all error devices. Clear fields properly.
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*/
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static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
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{
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int pos, temp;
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/* Must reset in this function */
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info->status = 0;
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info->tlp_header_valid = 0;
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@ -657,11 +666,10 @@ static void aer_isr_one_error(struct pcie_device *p_device,
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struct aer_err_source *e_src)
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{
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struct aer_err_info *e_info;
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int i;
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/* struct aer_err_info might be big, so we allocate it with slab */
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e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL);
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if (e_info == NULL) {
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if (!e_info) {
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dev_printk(KERN_DEBUG, &p_device->port->dev,
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"Can't allocate mem when processing AER errors\n");
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return;
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@ -671,26 +679,33 @@ static void aer_isr_one_error(struct pcie_device *p_device,
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* There is a possibility that both correctable error and
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* uncorrectable error being logged. Report correctable error first.
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*/
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for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) {
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if (i > 4)
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break;
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if (!(e_src->status & i))
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continue;
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if (e_src->status & PCI_ERR_ROOT_COR_RCV) {
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e_info->id = ERR_COR_ID(e_src->id);
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e_info->severity = AER_CORRECTABLE;
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memset(e_info, 0, sizeof(struct aer_err_info));
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/* Init comprehensive error information */
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if (i & PCI_ERR_ROOT_COR_RCV) {
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e_info->id = ERR_COR_ID(e_src->id);
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e_info->severity = AER_CORRECTABLE;
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} else {
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e_info->id = ERR_UNCOR_ID(e_src->id);
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e_info->severity = ((e_src->status >> 6) & 1);
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}
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if (e_src->status &
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(PCI_ERR_ROOT_MULTI_COR_RCV |
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PCI_ERR_ROOT_MULTI_UNCOR_RCV))
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if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV)
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e_info->multi_error_valid = 1;
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else
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e_info->multi_error_valid = 0;
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aer_print_port_info(p_device->port, e_info);
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if (find_source_device(p_device->port, e_info))
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aer_process_err_devices(p_device, e_info);
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}
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if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
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e_info->id = ERR_UNCOR_ID(e_src->id);
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if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
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e_info->severity = AER_FATAL;
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else
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e_info->severity = AER_NONFATAL;
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if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV)
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e_info->multi_error_valid = 1;
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else
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e_info->multi_error_valid = 0;
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aer_print_port_info(p_device->port, e_info);
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