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| author | Borislav Petkov | 2012-08-09 18:41:07 +0200 |
|---|---|---|
| committer | Borislav Petkov | 2012-11-28 11:45:01 +0100 |
| commit | 66fed2d464157eb20c37738d75b281458dfc2cab (patch) | |
| tree | 2ef45590cacc3c69d9901153f4dc1199e20b7fa1 /drivers/edac/amd64_edac_inj.c | |
| parent | amd64_edac: Cleanup error injection code (diff) | |
| download | kernel-qcow2-linux-66fed2d464157eb20c37738d75b281458dfc2cab.tar.gz kernel-qcow2-linux-66fed2d464157eb20c37738d75b281458dfc2cab.tar.xz kernel-qcow2-linux-66fed2d464157eb20c37738d75b281458dfc2cab.zip | |
amd64_edac: Improve error injection
When injecting DRAM ECC errors over the F3xB[8,C] interface, the machine
does this by injecting the error in the next non-cached access. This
takes relatively long time on a normal system so that in order for us to
expedite it, we disable the caches around the injection.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Diffstat (limited to 'drivers/edac/amd64_edac_inj.c')
| -rw-r--r-- | drivers/edac/amd64_edac_inj.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/edac/amd64_edac_inj.c b/drivers/edac/amd64_edac_inj.c index 8977e2fa61da..8c171fa1cb9b 100644 --- a/drivers/edac/amd64_edac_inj.c +++ b/drivers/edac/amd64_edac_inj.c @@ -153,8 +153,8 @@ static ssize_t amd64_inject_write_store(struct device *dev, { struct mem_ctl_info *mci = to_mci(dev); struct amd64_pvt *pvt = mci->pvt_info; + u32 section, word_bits, tmp; unsigned long value; - u32 section, word_bits; int ret; ret = strict_strtoul(data, 10, &value); @@ -168,9 +168,25 @@ static ssize_t amd64_inject_write_store(struct device *dev, word_bits = SET_NB_DRAM_INJECTION_WRITE(pvt->injection); + pr_notice_once("Don't forget to decrease MCE polling interval in\n" + "/sys/bus/machinecheck/devices/machinecheck<CPUNUM>/check_interval\n" + "so that you can get the error report faster.\n"); + + on_each_cpu(disable_caches, NULL, 1); + /* Issue 'word' and 'bit' along with the READ request */ amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits); + retry: + /* wait until injection happens */ + amd64_read_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, &tmp); + if (tmp & F10_NB_ARR_ECC_WR_REQ) { + cpu_relax(); + goto retry; + } + + on_each_cpu(enable_caches, NULL, 1); + edac_dbg(0, "section=0x%x word_bits=0x%x\n", section, word_bits); return count; |