On Mon, Jun 13, 2016 at 08:56:49PM +0300, Andy Shevchenko wrote:
> This patch does the following:
> - refactors code to use recently introduced DEFINE_DEBUGFS_ATTRIBUTE() macro
> - makes absence of DEBUG_FS non-fatal error
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
> drivers/platform/x86/intel_pmc_core.c | 45 ++++++++---------------------------
> drivers/platform/x86/intel_pmc_core.h | 5 ++--
> 2 files changed, 13 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
> index e57f923..c29f59b 100644
> --- a/drivers/platform/x86/intel_pmc_core.c
> +++ b/drivers/platform/x86/intel_pmc_core.c
> @@ -23,7 +23,6 @@
> #include <linux/init.h>
> #include <linux/io.h>
> #include <linux/pci.h>
> -#include <linux/seq_file.h>
>
> #include <asm/cpu_device_id.h>
> #include <asm/intel-family.h>
> @@ -78,30 +77,18 @@ int intel_pmc_slp_s0_counter_read(u32 *data)
> }
> EXPORT_SYMBOL_GPL(intel_pmc_slp_s0_counter_read);
>
> -#if IS_ENABLED(CONFIG_DEBUG_FS)
> -static int pmc_core_dev_state_show(struct seq_file *s, void *unused)
> +static int pmc_core_dev_state_get(void *data, u64 *val)
> {
> - struct pmc_dev *pmcdev = s->private;
> - u32 counter_val;
> + struct pmc_dev *pmcdev = data;
> + u32 value;
>
> - counter_val = pmc_core_reg_read(pmcdev,
> - SPT_PMC_SLP_S0_RES_COUNTER_OFFSET);
> - seq_printf(s, "%u\n", pmc_core_adjust_slp_s0_step(counter_val));
> + value = pmc_core_reg_read(pmcdev, SPT_PMC_SLP_S0_RES_COUNTER_OFFSET);
> + *val = pmc_core_adjust_slp_s0_step(value);
>
We were ensuring a new line for printing the output value with seq_printf
whereas in this case the output is printed along with the shell prompt.
Sometimes this could be harder to read.
> return 0;
> }
>
> -static int pmc_core_dev_state_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, pmc_core_dev_state_show, inode->i_private);
> -}
> -
> -static const struct file_operations pmc_core_dev_state_ops = {
> - .open = pmc_core_dev_state_open,
> - .read = seq_read,
> - .llseek = seq_lseek,
> - .release = single_release,
> -};
> +DEFINE_DEBUGFS_ATTRIBUTE(pmc_core_dev_state, pmc_core_dev_state_get, NULL, "%llu");
>
> static void pmc_core_dbgfs_unregister(struct pmc_dev *pmcdev)
> {
> @@ -113,12 +100,12 @@ static int pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
> struct dentry *dir, *file;
>
> dir = debugfs_create_dir("pmc_core", NULL);
> - if (!dir)
> + if (IS_ERR_OR_NULL(dir))
> return -ENOMEM;
>
> pmcdev->dbgfs_dir = dir;
> file = debugfs_create_file("slp_s0_residency_usec", S_IFREG | S_IRUGO,
> - dir, pmcdev, &pmc_core_dev_state_ops);
> + dir, pmcdev, &pmc_core_dev_state);
>
> if (!file) {
> pmc_core_dbgfs_unregister(pmcdev);
> @@ -127,16 +114,6 @@ static int pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
>
> return 0;
> }
> -#else
> -static inline int pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
> -{
> - return 0;
> -}
> -
> -static inline void pmc_core_dbgfs_unregister(struct pmc_dev *pmcdev)
> -{
> -}
> -#endif /* CONFIG_DEBUG_FS */
>
> static const struct x86_cpu_id intel_pmc_core_ids[] = {
> { X86_VENDOR_INTEL, 6, INTEL_FAM6_SKYLAKE_MOBILE, X86_FEATURE_MWAIT,
> @@ -183,10 +160,8 @@ static int pmc_core_probe(struct pci_dev *dev, const struct pci_device_id *id)
> }
>
> err = pmc_core_dbgfs_register(pmcdev);
> - if (err < 0) {
> - dev_err(&dev->dev, "PMC Core: debugfs register failed.\n");
> - return err;
> - }
> + if (err < 0)
> + dev_warn(&dev->dev, "PMC Core: debugfs register failed.\n");
>
> pmc.has_slp_s0_res = true;
> return 0;
> diff --git a/drivers/platform/x86/intel_pmc_core.h b/drivers/platform/x86/intel_pmc_core.h
> index a9dadaf..9689b92 100644
> --- a/drivers/platform/x86/intel_pmc_core.h
> +++ b/drivers/platform/x86/intel_pmc_core.h
> @@ -23,11 +23,14 @@
>
> /* Sunrise Point Power Management Controller PCI Device ID */
> #define SPT_PMC_PCI_DEVICE_ID 0x9d21
> +
> #define SPT_PMC_BASE_ADDR_OFFSET 0x48
> #define SPT_PMC_SLP_S0_RES_COUNTER_OFFSET 0x13c
> #define SPT_PMC_MMIO_REG_LEN 0x100
> #define SPT_PMC_SLP_S0_RES_COUNTER_STEP 0x64
>
> +struct dentry;
> +
Why do we need this ?
> /**
> * struct pmc_dev - pmc device structure
> * @base_addr: comtains pmc base address
> @@ -42,9 +45,7 @@
> struct pmc_dev {
> u32 base_addr;
> void __iomem *regbase;
> -#if IS_ENABLED(CONFIG_DEBUG_FS)
> struct dentry *dbgfs_dir;
> -#endif /* CONFIG_DEBUG_FS */
> bool has_slp_s0_res;
> };
>
> --
> 2.8.1
>
--
Best Regards,
Rajneesh
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