linux/drivers/edac/amd64_edac_inj.c

#include "amd64_edac.h"

static ssize_t amd64_inject_section_show(struct device *dev,
					 struct device_attribute *mattr,
					 char *buf)
{
	struct mem_ctl_info *mci = to_mci(dev);
	struct amd64_pvt *pvt = mci->pvt_info;
	return sprintf(buf, "0x%x\n", pvt->injection.section);
}

/*
 * store error injection section value which refers to one of 4 16-byte sections
 * within a 64-byte cacheline
 *
 * range: 0..3
 */
static ssize_t amd64_inject_section_store(struct device *dev,
					  struct device_attribute *mattr,
					  const char *data, size_t count)
{
	struct mem_ctl_info *mci = to_mci(dev);
	struct amd64_pvt *pvt = mci->pvt_info;
	unsigned long value;
	int ret = 0;

	ret = strict_strtoul(data, 10, &value);
	if (ret != -EINVAL) {

		if (value > 3) {
			amd64_warn("%s: invalid section 0x%lx\n", __func__, value);
			return -EINVAL;
		}

		pvt->injection.section = (u32) value;
		return count;
	}
	return ret;
}

static ssize_t amd64_inject_word_show(struct device *dev,
					struct device_attribute *mattr,
					char *buf)
{
	struct mem_ctl_info *mci = to_mci(dev);
	struct amd64_pvt *pvt = mci->pvt_info;
	return sprintf(buf, "0x%x\n", pvt->injection.word);
}

/*
 * store error injection word value which refers to one of 9 16-bit word of the
 * 16-byte (128-bit + ECC bits) section
 *
 * range: 0..8
 */
static ssize_t amd64_inject_word_store(struct device *dev,
				       struct device_attribute *mattr,
				       const char *data, size_t count)
{
	struct mem_ctl_info *mci = to_mci(dev);
	struct amd64_pvt *pvt = mci->pvt_info;
	unsigned long value;
	int ret = 0;

	ret = strict_strtoul(data, 10, &value);
	if (ret != -EINVAL) {

		if (value > 8) {
			amd64_warn("%s: invalid word 0x%lx\n", __func__, value);
			return -EINVAL;
		}

		pvt->injection.word = (u32) value;
		return count;
	}
	return ret;
}

static ssize_t amd64_inject_ecc_vector_show(struct device *dev,
					    struct device_attribute *mattr,
					    char *buf)
{
	struct mem_ctl_info *mci = to_mci(dev);
	struct amd64_pvt *pvt = mci->pvt_info;
	return sprintf(buf, "0x%x\n", pvt->injection.bit_map);
}

/*
 * store 16 bit error injection vector which enables injecting errors to the
 * corresponding bit within the error injection word above. When used during a
 * DRAM ECC read, it holds the contents of the of the DRAM ECC bits.
 */
static ssize_t amd64_inject_ecc_vector_store(struct device *dev,
				       struct device_attribute *mattr,
				       const char *data, size_t count)
{
	struct mem_ctl_info *mci = to_mci(dev);
	struct amd64_pvt *pvt = mci->pvt_info;
	unsigned long value;
	int ret = 0;

	ret = strict_strtoul(data, 16, &value);
	if (ret != -EINVAL) {

		if (value & 0xFFFF0000) {
			amd64_warn("%s: invalid EccVector: 0x%lx\n",
				   __func__, value);
			return -EINVAL;
		}

		pvt->injection.bit_map = (u32) value;
		return count;
	}
	return ret;
}

/*
 * Do a DRAM ECC read. Assemble staged values in the pvt area, format into
 * fields needed by the injection registers and read the NB Array Data Port.
 */
static ssize_t amd64_inject_read_store(struct device *dev,
				       struct device_attribute *mattr,
				       const char *data, size_t count)
{
	struct mem_ctl_info *mci = to_mci(dev);
	struct amd64_pvt *pvt = mci->pvt_info;
	unsigned long value;
	u32 section, word_bits;
	int ret = 0;

	ret = strict_strtoul(data, 10, &value);
	if (ret != -EINVAL) {

		/* Form value to choose 16-byte section of cacheline */
		section = F10_NB_ARRAY_DRAM_ECC |
				SET_NB_ARRAY_ADDRESS(pvt->injection.section);
		amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_ADDR, section);

		word_bits = SET_NB_DRAM_INJECTION_READ(pvt->injection.word,
						pvt->injection.bit_map);

		/* Issue 'word' and 'bit' along with the READ request */
		amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits);

		edac_dbg(0, "section=0x%x word_bits=0x%x\n",
			 section, word_bits);

		return count;
	}
	return ret;
}

/*
 * Do a DRAM ECC write. Assemble staged values in the pvt area and format into
 * fields needed by the injection registers.
 */
static ssize_t amd64_inject_write_store(struct device *dev,
					struct device_attribute *mattr,
					const char *data, size_t count)
{
	struct mem_ctl_info *mci = to_mci(dev);
	struct amd64_pvt *pvt = mci->pvt_info;
	unsigned long value;
	u32 section, word_bits;
	int ret = 0;

	ret = strict_strtoul(data, 10, &value);
	if (ret != -EINVAL) {

		/* Form value to choose 16-byte section of cacheline */
		section = F10_NB_ARRAY_DRAM_ECC |
				SET_NB_ARRAY_ADDRESS(pvt->injection.section);
		amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_ADDR, section);

		word_bits = SET_NB_DRAM_INJECTION_WRITE(pvt->injection.word,
						pvt->injection.bit_map);

		/* Issue 'word' and 'bit' along with the READ request */
		amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits);

		edac_dbg(0, "section=0x%x word_bits=0x%x\n",
			 section, word_bits);

		return count;
	}
	return ret;
}

/*
 * update NUM_INJ_ATTRS in case you add new members
 */

static DEVICE_ATTR(inject_section, S_IRUGO | S_IWUSR,
		   amd64_inject_section_show, amd64_inject_section_store);
static DEVICE_ATTR(inject_word, S_IRUGO | S_IWUSR,
		   amd64_inject_word_show, amd64_inject_word_store);
static DEVICE_ATTR(inject_ecc_vector, S_IRUGO | S_IWUSR,
		   amd64_inject_ecc_vector_show, amd64_inject_ecc_vector_store);
static DEVICE_ATTR(inject_write, S_IRUGO | S_IWUSR,
		   NULL, amd64_inject_write_store);
static DEVICE_ATTR(inject_read, S_IRUGO | S_IWUSR,
		   NULL, amd64_inject_read_store);


int amd64_create_sysfs_inject_files(struct mem_ctl_info *mci)
{
	int rc;

	rc = device_create_file(&mci->dev, &dev_attr_inject_section);
	if (rc < 0)
		return rc;
	rc = device_create_file(&mci->dev, &dev_attr_inject_word);
	if (rc < 0)
		return rc;
	rc = device_create_file(&mci->dev, &dev_attr_inject_ecc_vector);
	if (rc < 0)
		return rc;
	rc = device_create_file(&mci->dev, &dev_attr_inject_write);
	if (rc < 0)
		return rc;
	rc = device_create_file(&mci->dev, &dev_attr_inject_read);
	if (rc < 0)
		return rc;

	return 0;
}

void amd64_remove_sysfs_inject_files(struct mem_ctl_info *mci)
{
	device_remove_file(&mci->dev, &dev_attr_inject_section);
	device_remove_file(&mci->dev, &dev_attr_inject_word);
	device_remove_file(&mci->dev, &dev_attr_inject_ecc_vector);
	device_remove_file(&mci->dev, &dev_attr_inject_write);
	device_remove_file(&mci->dev, &dev_attr_inject_read);
}