coresight-etm4x: Controls pertaining to the VM ID functions
Adding sysfs entries to access and configure specifics about the virtual machine ID comparator functions. Signed-off-by: Pratik Patel <pratikp@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pratik Patel
Greg Kroah-Hartman
parent
4a584be1d0
commit
40d8ebf071
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@ -261,3 +261,23 @@ KernelVersion: 4.01
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Mask for all 8 context ID comparator value
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registers (if implemented).
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What: /sys/bus/coresight/devices/<memory_map>.etm/vmid_idx
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Date: April 2015
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KernelVersion: 4.01
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Select which virtual machine ID comparator to work with.
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What: /sys/bus/coresight/devices/<memory_map>.etm/vmid_val
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Date: April 2015
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KernelVersion: 4.01
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Get/Set the virtual machine ID comparator value to
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trigger on.
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What: /sys/bus/coresight/devices/<memory_map>.etm/vmid_masks
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Date: April 2015
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KernelVersion: 4.01
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Mask for all 8 virtual machine ID comparator value
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registers (if implemented).
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@ -1964,6 +1964,181 @@ static ssize_t ctxid_masks_store(struct device *dev,
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}
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static DEVICE_ATTR_RW(ctxid_masks);
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static ssize_t vmid_idx_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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unsigned long val;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
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val = drvdata->vmid_idx;
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return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
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}
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static ssize_t vmid_idx_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned long val;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
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if (kstrtoul(buf, 16, &val))
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return -EINVAL;
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if (val >= drvdata->numvmidc)
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return -EINVAL;
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/*
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* Use spinlock to ensure index doesn't change while it gets
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* dereferenced multiple times within a spinlock block elsewhere.
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*/
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spin_lock(&drvdata->spinlock);
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drvdata->vmid_idx = val;
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spin_unlock(&drvdata->spinlock);
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return size;
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}
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static DEVICE_ATTR_RW(vmid_idx);
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static ssize_t vmid_val_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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unsigned long val;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
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val = (unsigned long)drvdata->vmid_val[drvdata->vmid_idx];
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return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
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}
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static ssize_t vmid_val_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned long val;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
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/*
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* only implemented when vmid tracing is enabled, i.e. at least one
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* vmid comparator is implemented and at least 8 bit vmid size
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*/
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if (!drvdata->vmid_size || !drvdata->numvmidc)
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return -EINVAL;
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if (kstrtoul(buf, 16, &val))
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return -EINVAL;
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spin_lock(&drvdata->spinlock);
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drvdata->vmid_val[drvdata->vmid_idx] = (u64)val;
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spin_unlock(&drvdata->spinlock);
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return size;
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}
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static DEVICE_ATTR_RW(vmid_val);
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static ssize_t vmid_masks_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned long val1, val2;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
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spin_lock(&drvdata->spinlock);
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val1 = drvdata->vmid_mask0;
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val2 = drvdata->vmid_mask1;
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spin_unlock(&drvdata->spinlock);
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return scnprintf(buf, PAGE_SIZE, "%#lx %#lx\n", val1, val2);
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}
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static ssize_t vmid_masks_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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u8 i, j, maskbyte;
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unsigned long val1, val2, mask;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
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/*
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* only implemented when vmid tracing is enabled, i.e. at least one
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* vmid comparator is implemented and at least 8 bit vmid size
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*/
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if (!drvdata->vmid_size || !drvdata->numvmidc)
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return -EINVAL;
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if (sscanf(buf, "%lx %lx", &val1, &val2) != 2)
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return -EINVAL;
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spin_lock(&drvdata->spinlock);
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/*
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* each byte[0..3] controls mask value applied to vmid
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* comparator[0..3]
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*/
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switch (drvdata->numvmidc) {
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case 0x1:
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/* COMP0, bits[7:0] */
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drvdata->vmid_mask0 = val1 & 0xFF;
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break;
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case 0x2:
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/* COMP1, bits[15:8] */
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drvdata->vmid_mask0 = val1 & 0xFFFF;
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break;
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case 0x3:
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/* COMP2, bits[23:16] */
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drvdata->vmid_mask0 = val1 & 0xFFFFFF;
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break;
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case 0x4:
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/* COMP3, bits[31:24] */
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drvdata->vmid_mask0 = val1;
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break;
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case 0x5:
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/* COMP4, bits[7:0] */
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drvdata->vmid_mask0 = val1;
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drvdata->vmid_mask1 = val2 & 0xFF;
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break;
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case 0x6:
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/* COMP5, bits[15:8] */
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drvdata->vmid_mask0 = val1;
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drvdata->vmid_mask1 = val2 & 0xFFFF;
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break;
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case 0x7:
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/* COMP6, bits[23:16] */
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drvdata->vmid_mask0 = val1;
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drvdata->vmid_mask1 = val2 & 0xFFFFFF;
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break;
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case 0x8:
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/* COMP7, bits[31:24] */
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drvdata->vmid_mask0 = val1;
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drvdata->vmid_mask1 = val2;
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break;
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default:
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break;
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}
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/*
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* If software sets a mask bit to 1, it must program relevant byte
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* of vmid comparator value 0x0, otherwise behavior is unpredictable.
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* For example, if bit[3] of vmid_mask0 is 1, we must clear bits[31:24]
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* of vmid comparator0 value (corresponding to byte 0) register.
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*/
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mask = drvdata->vmid_mask0;
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for (i = 0; i < drvdata->numvmidc; i++) {
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/* mask value of corresponding vmid comparator */
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maskbyte = mask & ETMv4_EVENT_MASK;
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/*
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* each bit corresponds to a byte of respective vmid comparator
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* value register
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*/
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for (j = 0; j < 8; j++) {
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if (maskbyte & 1)
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drvdata->vmid_val[i] &= ~(0xFF << (j * 8));
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maskbyte >>= 1;
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}
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/* Select the next vmid comparator mask value */
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if (i == 3)
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/* vmid comparators[4-7] */
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mask = drvdata->vmid_mask1;
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else
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mask >>= 0x8;
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}
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spin_unlock(&drvdata->spinlock);
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return size;
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}
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static DEVICE_ATTR_RW(vmid_masks);
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static ssize_t cpu_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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@ -2019,6 +2194,9 @@ static struct attribute *coresight_etmv4_attrs[] = {
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&dev_attr_ctxid_idx.attr,
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&dev_attr_ctxid_val.attr,
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&dev_attr_ctxid_masks.attr,
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&dev_attr_vmid_idx.attr,
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&dev_attr_vmid_val.attr,
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&dev_attr_vmid_masks.attr,
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&dev_attr_cpu.attr,
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NULL,
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};
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