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Date: Wed, 7 Apr 2021 11:02:33 -0400
From: Rajneesh Bhardwaj <irenic.rajneesh@...il.com>
To: "David E. Box" <david.e.box@...ux.intel.com>
Cc: hdegoede@...hat.com, mgross@...ux.intel.com,
gayatri.kammela@...el.com, platform-driver-x86@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] platform/x86: intel_pmc_core: Remove global struct pmc_dev
Reviewed-by: Rajneesh Bhardwaj <irenic.rajneesh@...il.com>
On Wed, Mar 31, 2021 at 11:06 PM David E. Box
<david.e.box@...ux.intel.com> wrote:
>
> 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@...ux.intel.com>
> ---
> 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 260d49dca1ad..5ca40fe3da59 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},
> @@ -617,9 +615,8 @@ 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);
> @@ -744,28 +741,26 @@ 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);
> @@ -791,7 +786,7 @@ 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;
> }
> @@ -799,7 +794,7 @@ 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;
> }
> @@ -842,7 +837,7 @@ 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;
> }
> @@ -863,9 +858,8 @@ 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;
> @@ -891,6 +885,8 @@ 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;
>
> @@ -900,7 +896,7 @@ 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;
> }
> @@ -1228,13 +1224,19 @@ 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;
> @@ -1264,8 +1266,7 @@ 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);
>
> /*
> @@ -1274,7 +1275,7 @@ 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
>
--
Thanks,
Rajneesh
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