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platform/x86: intel_pmc_core: Add LTR IGNORE debug feature
SPT LTR_IGN register provides a means to make the PMC ignore the LTR values reported by the individual PCH devices. echo <IP Offset> > /sys/kernel/debug/pmc_core/ltr_ignore. When a particular IP Offset bit is set the PMC will ignore the LTR value reported by the corresponding IP when the PMC performs the latency coalescing. IP Offset IP Name 0 SPA 1 SPB 2 SATA 3 GBE 4 XHCI 5 RSVD 6 ME 7 EVA 8 SPC 9 Azalia/ADSP 10 RSVD 11 LPSS 12 SPD 13 SPE 14 Camera 15 ESPI 16 SCC 17 ISH Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com> [dvhart: pmc_core_ltr_ignore_write local declaration order cleanup] Signed-off-by: Darren Hart <dvhart@linux.intel.com>
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parent
fe74822757
commit
9c2ee19987
2 changed files with 58 additions and 1 deletions
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@ -19,11 +19,12 @@
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*/
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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@ -373,6 +374,53 @@ static const struct file_operations pmc_core_pll_ops = {
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.release = single_release,
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};
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static ssize_t pmc_core_ltr_ignore_write(struct file *file, const char __user
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*userbuf, size_t count, loff_t *ppos)
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{
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struct pmc_dev *pmcdev = &pmc;
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u32 val, buf_size, fd;
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int err = 0;
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buf_size = count < 64 ? count : 64;
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mutex_lock(&pmcdev->lock);
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if (kstrtou32_from_user(userbuf, buf_size, 10, &val)) {
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err = -EFAULT;
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goto out_unlock;
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}
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if (val > NUM_IP_IGN_ALLOWED) {
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err = -EINVAL;
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goto out_unlock;
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}
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fd = pmc_core_reg_read(pmcdev, SPT_PMC_LTR_IGNORE_OFFSET);
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fd |= (1U << val);
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pmc_core_reg_write(pmcdev, SPT_PMC_LTR_IGNORE_OFFSET, fd);
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out_unlock:
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mutex_unlock(&pmcdev->lock);
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return err == 0 ? count : err;
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}
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static int pmc_core_ltr_ignore_show(struct seq_file *s, void *unused)
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{
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return 0;
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}
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static int pmc_core_ltr_ignore_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pmc_core_ltr_ignore_show, inode->i_private);
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}
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static const struct file_operations pmc_core_ltr_ignore_ops = {
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.open = pmc_core_ltr_ignore_open,
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.read = seq_read,
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.write = pmc_core_ltr_ignore_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void pmc_core_dbgfs_unregister(struct pmc_dev *pmcdev)
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{
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debugfs_remove_recursive(pmcdev->dbgfs_dir);
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@ -410,6 +458,13 @@ static int pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
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if (!file)
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goto err;
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file = debugfs_create_file("ltr_ignore",
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S_IFREG | S_IRUGO, dir, pmcdev,
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&pmc_core_ltr_ignore_ops);
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if (!file)
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goto err;
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return 0;
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err:
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pmc_core_dbgfs_unregister(pmcdev);
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@ -30,6 +30,7 @@
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#define SPT_PMC_PM_STS_OFFSET 0x1c
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#define SPT_PMC_MTPMC_OFFSET 0x20
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#define SPT_PMC_MFPMC_OFFSET 0x38
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#define SPT_PMC_LTR_IGNORE_OFFSET 0x30C
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#define SPT_PMC_MPHY_CORE_STS_0 0x1143
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#define SPT_PMC_MPHY_CORE_STS_1 0x1142
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#define SPT_PMC_MPHY_COM_STS_0 0x1155
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@ -41,6 +42,7 @@
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#define SPT_PMC_READ_DISABLE_BIT 0x16
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#define SPT_PMC_MSG_FULL_STS_BIT 0x18
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#define NUM_RETRIES 100
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#define NUM_IP_IGN_ALLOWED 17
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/* Sunrise Point: PGD PFET Enable Ack Status Registers */
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enum ppfear_regs {
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