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66fed2d464
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>
242 lines
6.5 KiB
C
242 lines
6.5 KiB
C
#include "amd64_edac.h"
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static ssize_t amd64_inject_section_show(struct device *dev,
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struct device_attribute *mattr,
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char *buf)
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{
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struct mem_ctl_info *mci = to_mci(dev);
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struct amd64_pvt *pvt = mci->pvt_info;
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return sprintf(buf, "0x%x\n", pvt->injection.section);
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}
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/*
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* store error injection section value which refers to one of 4 16-byte sections
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* within a 64-byte cacheline
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*
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* range: 0..3
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*/
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static ssize_t amd64_inject_section_store(struct device *dev,
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struct device_attribute *mattr,
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const char *data, size_t count)
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{
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struct mem_ctl_info *mci = to_mci(dev);
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struct amd64_pvt *pvt = mci->pvt_info;
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unsigned long value;
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int ret;
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ret = strict_strtoul(data, 10, &value);
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if (ret < 0)
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return ret;
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if (value > 3) {
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amd64_warn("%s: invalid section 0x%lx\n", __func__, value);
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return -EINVAL;
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}
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pvt->injection.section = (u32) value;
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return count;
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}
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static ssize_t amd64_inject_word_show(struct device *dev,
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struct device_attribute *mattr,
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char *buf)
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{
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struct mem_ctl_info *mci = to_mci(dev);
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struct amd64_pvt *pvt = mci->pvt_info;
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return sprintf(buf, "0x%x\n", pvt->injection.word);
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}
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/*
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* store error injection word value which refers to one of 9 16-bit word of the
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* 16-byte (128-bit + ECC bits) section
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*
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* range: 0..8
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*/
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static ssize_t amd64_inject_word_store(struct device *dev,
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struct device_attribute *mattr,
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const char *data, size_t count)
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{
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struct mem_ctl_info *mci = to_mci(dev);
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struct amd64_pvt *pvt = mci->pvt_info;
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unsigned long value;
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int ret;
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ret = strict_strtoul(data, 10, &value);
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if (ret < 0)
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return ret;
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if (value > 8) {
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amd64_warn("%s: invalid word 0x%lx\n", __func__, value);
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return -EINVAL;
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}
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pvt->injection.word = (u32) value;
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return count;
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}
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static ssize_t amd64_inject_ecc_vector_show(struct device *dev,
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struct device_attribute *mattr,
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char *buf)
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{
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struct mem_ctl_info *mci = to_mci(dev);
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struct amd64_pvt *pvt = mci->pvt_info;
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return sprintf(buf, "0x%x\n", pvt->injection.bit_map);
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}
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/*
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* store 16 bit error injection vector which enables injecting errors to the
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* corresponding bit within the error injection word above. When used during a
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* DRAM ECC read, it holds the contents of the of the DRAM ECC bits.
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*/
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static ssize_t amd64_inject_ecc_vector_store(struct device *dev,
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struct device_attribute *mattr,
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const char *data, size_t count)
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{
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struct mem_ctl_info *mci = to_mci(dev);
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struct amd64_pvt *pvt = mci->pvt_info;
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unsigned long value;
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int ret;
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ret = strict_strtoul(data, 16, &value);
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if (ret < 0)
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return ret;
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if (value & 0xFFFF0000) {
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amd64_warn("%s: invalid EccVector: 0x%lx\n", __func__, value);
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return -EINVAL;
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}
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pvt->injection.bit_map = (u32) value;
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return count;
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}
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/*
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* Do a DRAM ECC read. Assemble staged values in the pvt area, format into
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* fields needed by the injection registers and read the NB Array Data Port.
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*/
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static ssize_t amd64_inject_read_store(struct device *dev,
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struct device_attribute *mattr,
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const char *data, size_t count)
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{
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struct mem_ctl_info *mci = to_mci(dev);
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struct amd64_pvt *pvt = mci->pvt_info;
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unsigned long value;
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u32 section, word_bits;
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int ret;
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ret = strict_strtoul(data, 10, &value);
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if (ret < 0)
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return ret;
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/* Form value to choose 16-byte section of cacheline */
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section = F10_NB_ARRAY_DRAM | SET_NB_ARRAY_ADDR(pvt->injection.section);
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amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_ADDR, section);
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word_bits = SET_NB_DRAM_INJECTION_READ(pvt->injection);
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/* Issue 'word' and 'bit' along with the READ request */
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amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits);
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edac_dbg(0, "section=0x%x word_bits=0x%x\n", section, word_bits);
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return count;
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}
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/*
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* Do a DRAM ECC write. Assemble staged values in the pvt area and format into
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* fields needed by the injection registers.
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*/
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static ssize_t amd64_inject_write_store(struct device *dev,
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struct device_attribute *mattr,
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const char *data, size_t count)
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{
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struct mem_ctl_info *mci = to_mci(dev);
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struct amd64_pvt *pvt = mci->pvt_info;
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u32 section, word_bits, tmp;
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unsigned long value;
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int ret;
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ret = strict_strtoul(data, 10, &value);
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if (ret < 0)
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return ret;
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/* Form value to choose 16-byte section of cacheline */
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section = F10_NB_ARRAY_DRAM | SET_NB_ARRAY_ADDR(pvt->injection.section);
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amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_ADDR, section);
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word_bits = SET_NB_DRAM_INJECTION_WRITE(pvt->injection);
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pr_notice_once("Don't forget to decrease MCE polling interval in\n"
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"/sys/bus/machinecheck/devices/machinecheck<CPUNUM>/check_interval\n"
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"so that you can get the error report faster.\n");
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on_each_cpu(disable_caches, NULL, 1);
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/* Issue 'word' and 'bit' along with the READ request */
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amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits);
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retry:
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/* wait until injection happens */
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amd64_read_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, &tmp);
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if (tmp & F10_NB_ARR_ECC_WR_REQ) {
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cpu_relax();
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goto retry;
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}
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on_each_cpu(enable_caches, NULL, 1);
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edac_dbg(0, "section=0x%x word_bits=0x%x\n", section, word_bits);
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return count;
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}
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/*
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* update NUM_INJ_ATTRS in case you add new members
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*/
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static DEVICE_ATTR(inject_section, S_IRUGO | S_IWUSR,
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amd64_inject_section_show, amd64_inject_section_store);
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static DEVICE_ATTR(inject_word, S_IRUGO | S_IWUSR,
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amd64_inject_word_show, amd64_inject_word_store);
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static DEVICE_ATTR(inject_ecc_vector, S_IRUGO | S_IWUSR,
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amd64_inject_ecc_vector_show, amd64_inject_ecc_vector_store);
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static DEVICE_ATTR(inject_write, S_IRUGO | S_IWUSR,
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NULL, amd64_inject_write_store);
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static DEVICE_ATTR(inject_read, S_IRUGO | S_IWUSR,
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NULL, amd64_inject_read_store);
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int amd64_create_sysfs_inject_files(struct mem_ctl_info *mci)
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{
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int rc;
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rc = device_create_file(&mci->dev, &dev_attr_inject_section);
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if (rc < 0)
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return rc;
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rc = device_create_file(&mci->dev, &dev_attr_inject_word);
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if (rc < 0)
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return rc;
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rc = device_create_file(&mci->dev, &dev_attr_inject_ecc_vector);
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if (rc < 0)
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return rc;
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rc = device_create_file(&mci->dev, &dev_attr_inject_write);
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if (rc < 0)
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return rc;
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rc = device_create_file(&mci->dev, &dev_attr_inject_read);
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if (rc < 0)
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return rc;
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return 0;
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}
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void amd64_remove_sysfs_inject_files(struct mem_ctl_info *mci)
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{
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device_remove_file(&mci->dev, &dev_attr_inject_section);
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device_remove_file(&mci->dev, &dev_attr_inject_word);
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device_remove_file(&mci->dev, &dev_attr_inject_ecc_vector);
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device_remove_file(&mci->dev, &dev_attr_inject_write);
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device_remove_file(&mci->dev, &dev_attr_inject_read);
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}
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