From d99bb1db798f49eacb27e087da7e62433361174d Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Wed, 9 May 2007 09:35:32 +1000 Subject: [PATCH] [POWERPC] EEH: capture and log pci state on error If an EEH event is observed, capture PCI config space info about the device, wrap it up and pass it to the event logger. This pach just slots in the basic logging function. A later patch will provide for more through data gathering. Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/pseries/eeh.c | 43 ++++++++++++++++++++++++++-- 1 file changed, 41 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c index 63e23062e982..b58ed05078b8 100644 --- a/arch/powerpc/platforms/pseries/eeh.c +++ b/arch/powerpc/platforms/pseries/eeh.c @@ -100,6 +100,9 @@ static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX]; static DEFINE_SPINLOCK(slot_errbuf_lock); static int eeh_error_buf_size; +#define EEH_PCI_REGS_LOG_LEN 4096 +static unsigned char pci_regs_buf[EEH_PCI_REGS_LOG_LEN]; + /* System monitoring statistics */ static unsigned long no_device; static unsigned long no_dn; @@ -115,7 +118,8 @@ static unsigned long slot_resets; /* --------------------------------------------------------------- */ /* Below lies the EEH event infrastructure */ -void eeh_slot_error_detail (struct pci_dn *pdn, int severity) +static void rtas_slot_error_detail(struct pci_dn *pdn, int severity, + char *driver_log, size_t loglen) { int config_addr; unsigned long flags; @@ -133,7 +137,8 @@ void eeh_slot_error_detail (struct pci_dn *pdn, int severity) rc = rtas_call(ibm_slot_error_detail, 8, 1, NULL, config_addr, BUID_HI(pdn->phb->buid), - BUID_LO(pdn->phb->buid), NULL, 0, + BUID_LO(pdn->phb->buid), + virt_to_phys(driver_log), loglen, virt_to_phys(slot_errbuf), eeh_error_buf_size, severity); @@ -143,6 +148,40 @@ void eeh_slot_error_detail (struct pci_dn *pdn, int severity) spin_unlock_irqrestore(&slot_errbuf_lock, flags); } +/** + * gather_pci_data - copy assorted PCI config space registers to buff + * @pdn: device to report data for + * @buf: point to buffer in which to log + * @len: amount of room in buffer + * + * This routine captures assorted PCI configuration space data, + * and puts them into a buffer for RTAS error logging. + */ +static size_t gather_pci_data(struct pci_dn *pdn, char * buf, size_t len) +{ + u32 cfg; + int n = 0; + + n += scnprintf(buf+n, len-n, "%s\n", pdn->node->name); + rtas_read_config(pdn, PCI_VENDOR_ID, 4, &cfg); + n += scnprintf(buf+n, len-n, "dev/vend:%x\n", cfg); + rtas_read_config(pdn, PCI_COMMAND, 4, &cfg); + n += scnprintf(buf+n, len-n, "cmd/stat:%x\n", cfg); + + return n; +} + +void eeh_slot_error_detail(struct pci_dn *pdn, int severity) +{ + size_t loglen = 0; + memset(pci_regs_buf, 0, EEH_PCI_REGS_LOG_LEN); + + rtas_pci_enable(pdn, EEH_THAW_MMIO); + loglen = gather_pci_data(pdn, pci_regs_buf, EEH_PCI_REGS_LOG_LEN); + + rtas_slot_error_detail(pdn, severity, pci_regs_buf, loglen); +} + /** * read_slot_reset_state - Read the reset state of a device node's slot * @dn: device node to read