[PATCH V2 2/9] platform/x86: intel_pmc_core: Remove global struct pmc_dev

David E. Box
2021-04-17T03:13:10Z

The intel_pmc_core driver did not always bind to a device which meant it
lacked a struct device that could be used to maintain driver data. So a
global instance of struct pmc_dev was used for this purpose and functions
accessed this directly. Since the driver now binds to an ACPI device,
remove the global pmc_dev in favor of one that is allocated during probe.
Modify users of the global to obtain the object by argument instead.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Rajneesh Bhardwaj <irenic.rajneesh@gmail.com>
---

V2: No change

drivers/platform/x86/intel_pmc_core.c | 41 ++++++++++++++-------------
1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index 07657532ccdb..e8474d171d23 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -31,8 +31,6 @@

#include "intel_pmc_core.h"

-static struct pmc_dev pmc;
-
/* PKGC MSRs are common across Intel Core SoCs */
static const struct pmc_bit_map msr_map[] = {
{"Package C2", MSR_PKG_C2_RESIDENCY},
@@ -729,9 +727,8 @@ static int pmc_core_dev_state_get(void *data, u64 *val)

DEFINE_DEBUGFS_ATTRIBUTE(pmc_core_dev_state, pmc_core_dev_state_get, NULL, "%llu\n");

-static int pmc_core_check_read_lock_bit(void)
+static int pmc_core_check_read_lock_bit(struct pmc_dev *pmcdev)
{
- struct pmc_dev *pmcdev = &pmc;
u32 value;

value = pmc_core_reg_read(pmcdev, pmcdev->map->pm_cfg_offset);
@@ -856,28 +853,26 @@ static int pmc_core_ppfear_show(struct seq_file *s, void *unused)
DEFINE_SHOW_ATTRIBUTE(pmc_core_ppfear);

/* This function should return link status, 0 means ready */
-static int pmc_core_mtpmc_link_status(void)
+static int pmc_core_mtpmc_link_status(struct pmc_dev *pmcdev)
{
- struct pmc_dev *pmcdev = &pmc;
u32 value;

value = pmc_core_reg_read(pmcdev, SPT_PMC_PM_STS_OFFSET);
return value & BIT(SPT_PMC_MSG_FULL_STS_BIT);
}

-static int pmc_core_send_msg(u32 *addr_xram)
+static int pmc_core_send_msg(struct pmc_dev *pmcdev, u32 *addr_xram)
{
- struct pmc_dev *pmcdev = &pmc;
u32 dest;
int timeout;

for (timeout = NUM_RETRIES; timeout > 0; timeout--) {
- if (pmc_core_mtpmc_link_status() == 0)
+ if (pmc_core_mtpmc_link_status(pmcdev) == 0)
break;
msleep(5);
}

- if (timeout <= 0 && pmc_core_mtpmc_link_status())
+ if (timeout <= 0 && pmc_core_mtpmc_link_status(pmcdev))
return -EBUSY;

dest = (*addr_xram & MTPMC_MASK) | (1U << 1);
@@ -903,7 +898,7 @@ static int pmc_core_mphy_pg_show(struct seq_file *s, void *unused)

mutex_lock(&pmcdev->lock);

- if (pmc_core_send_msg(&mphy_core_reg_low) != 0) {
+ if (pmc_core_send_msg(pmcdev, &mphy_core_reg_low) != 0) {
err = -EBUSY;
goto out_unlock;
}
@@ -911,7 +906,7 @@ static int pmc_core_mphy_pg_show(struct seq_file *s, void *unused)
msleep(10);
val_low = pmc_core_reg_read(pmcdev, SPT_PMC_MFPMC_OFFSET);

- if (pmc_core_send_msg(&mphy_core_reg_high) != 0) {
+ if (pmc_core_send_msg(pmcdev, &mphy_core_reg_high) != 0) {
err = -EBUSY;
goto out_unlock;
}
@@ -954,7 +949,7 @@ static int pmc_core_pll_show(struct seq_file *s, void *unused)
mphy_common_reg = (SPT_PMC_MPHY_COM_STS_0 << 16);
mutex_lock(&pmcdev->lock);

- if (pmc_core_send_msg(&mphy_common_reg) != 0) {
+ if (pmc_core_send_msg(pmcdev, &mphy_common_reg) != 0) {
err = -EBUSY;
goto out_unlock;
}
@@ -975,9 +970,8 @@ static int pmc_core_pll_show(struct seq_file *s, void *unused)
}
DEFINE_SHOW_ATTRIBUTE(pmc_core_pll);

-static int pmc_core_send_ltr_ignore(u32 value)
+static int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value)
{
- struct pmc_dev *pmcdev = &pmc;
const struct pmc_reg_map *map = pmcdev->map;
u32 reg;
int err = 0;
@@ -1003,6 +997,8 @@ static ssize_t pmc_core_ltr_ignore_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
+ struct seq_file *s = file->private_data;
+ struct pmc_dev *pmcdev = s->private;
u32 buf_size, value;
int err;

@@ -1012,7 +1008,7 @@ static ssize_t pmc_core_ltr_ignore_write(struct file *file,
if (err)
return err;

- err = pmc_core_send_ltr_ignore(value);
+ err = pmc_core_send_ltr_ignore(pmcdev, value);

return err == 0 ? count : err;
}
@@ -1340,13 +1336,19 @@ static void pmc_core_do_dmi_quirks(struct pmc_dev *pmcdev)
static int pmc_core_probe(struct platform_device *pdev)
{
static bool device_initialized;
- struct pmc_dev *pmcdev = &pmc;
+ struct pmc_dev *pmcdev;
const struct x86_cpu_id *cpu_id;
u64 slp_s0_addr;

if (device_initialized)
return -ENODEV;

+ pmcdev = devm_kzalloc(&pdev->dev, sizeof(*pmcdev), GFP_KERNEL);
+ if (!pmcdev)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, pmcdev);
+
cpu_id = x86_match_cpu(intel_pmc_core_ids);
if (!cpu_id)
return -ENODEV;
@@ -1376,8 +1378,7 @@ static int pmc_core_probe(struct platform_device *pdev)
return -ENOMEM;

mutex_init(&pmcdev->lock);
- platform_set_drvdata(pdev, pmcdev);
- pmcdev->pmc_xram_read_bit = pmc_core_check_read_lock_bit();
+ pmcdev->pmc_xram_read_bit = pmc_core_check_read_lock_bit(pmcdev);
pmc_core_do_dmi_quirks(pmcdev);

/*
@@ -1386,7 +1387,7 @@ static int pmc_core_probe(struct platform_device *pdev)
*/
if (pmcdev->map == &tgl_reg_map) {
dev_dbg(&pdev->dev, "ignoring GBE LTR\n");
- pmc_core_send_ltr_ignore(3);
+ pmc_core_send_ltr_ignore(pmcdev, 3);
}

pmc_core_dbgfs_register(pmcdev);
--
2.25.1