[Linux-kernel-mentees] [PATCH v1] crypto: ccp: sp-pci: use generic power management
Tom Lendacky
thomas.lendacky at amd.com
Tue Jul 21 15:19:33 UTC 2020
On 7/21/20 7:31 AM, Vaibhav Gupta wrote:
> Drivers using legacy power management .suspen()/.resume() callbacks
> have to manage PCI states and device's PM states themselves. They also
> need to take care of standard configuration registers.
>
> Switch to generic power management framework using a single
> "struct dev_pm_ops" variable to take the unnecessary load from the driver.
> This also avoids the need for the driver to directly call most of the PCI
> helper functions and device power state control functions as through
> the generic framework, PCI Core takes care of the necessary operations,
> and drivers are required to do only device-specific jobs.
>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40 at gmail.com>
> ---
> drivers/crypto/ccp/ccp-dev.c | 8 +++-----
> drivers/crypto/ccp/sp-dev.c | 6 ++----
> drivers/crypto/ccp/sp-dev.h | 6 +++---
> drivers/crypto/ccp/sp-pci.c | 17 ++++++-----------
> drivers/crypto/ccp/sp-platform.c | 2 +-
> 5 files changed, 15 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/crypto/ccp/ccp-dev.c b/drivers/crypto/ccp/ccp-dev.c
> index 19ac509ed76e..8ae26d3cffff 100644
> --- a/drivers/crypto/ccp/ccp-dev.c
> +++ b/drivers/crypto/ccp/ccp-dev.c
> @@ -531,8 +531,7 @@ int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
> return len;
> }
>
> -#ifdef CONFIG_PM
> -bool ccp_queues_suspended(struct ccp_device *ccp)
> +bool __maybe_unused ccp_queues_suspended(struct ccp_device *ccp)
These aren't static functions, so is the __maybe_unused necessary?
(Same comment on the other non-static functions changed below)
> {
> unsigned int suspended = 0;
> unsigned long flags;
> @@ -549,7 +548,7 @@ bool ccp_queues_suspended(struct ccp_device *ccp)
> return ccp->cmd_q_count == suspended;
> }
>
> -int ccp_dev_suspend(struct sp_device *sp, pm_message_t state)
> +int __maybe_unused ccp_dev_suspend(struct sp_device *sp)
> {
> struct ccp_device *ccp = sp->ccp_data;
> unsigned long flags;
> @@ -577,7 +576,7 @@ int ccp_dev_suspend(struct sp_device *sp, pm_message_t state)
> return 0;
> }
>
> -int ccp_dev_resume(struct sp_device *sp)
> +int __maybe_unused ccp_dev_resume(struct sp_device *sp)
> {
> struct ccp_device *ccp = sp->ccp_data;
> unsigned long flags;
> @@ -601,7 +600,6 @@ int ccp_dev_resume(struct sp_device *sp)
>
> return 0;
> }
> -#endif
>
> int ccp_dev_init(struct sp_device *sp)
> {
> diff --git a/drivers/crypto/ccp/sp-dev.c b/drivers/crypto/ccp/sp-dev.c
> index ce42675d3274..6284a15e5047 100644
> --- a/drivers/crypto/ccp/sp-dev.c
> +++ b/drivers/crypto/ccp/sp-dev.c
> @@ -211,13 +211,12 @@ void sp_destroy(struct sp_device *sp)
> sp_del_device(sp);
> }
>
> -#ifdef CONFIG_PM
> -int sp_suspend(struct sp_device *sp, pm_message_t state)
> +int sp_suspend(struct sp_device *sp)
> {
> int ret;
>
> if (sp->dev_vdata->ccp_vdata) {
> - ret = ccp_dev_suspend(sp, state);
> + ret = ccp_dev_suspend(sp);
> if (ret)
> return ret;
> }
> @@ -237,7 +236,6 @@ int sp_resume(struct sp_device *sp)
>
> return 0;
> }
> -#endif
>
> struct sp_device *sp_get_psp_master_device(void)
> {
> diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h
> index f913f1494af9..0218d0670eee 100644
> --- a/drivers/crypto/ccp/sp-dev.h
> +++ b/drivers/crypto/ccp/sp-dev.h
> @@ -119,7 +119,7 @@ int sp_init(struct sp_device *sp);
> void sp_destroy(struct sp_device *sp);
> struct sp_device *sp_get_master(void);
>
> -int sp_suspend(struct sp_device *sp, pm_message_t state);
> +int sp_suspend(struct sp_device *sp);
> int sp_resume(struct sp_device *sp);
> int sp_request_ccp_irq(struct sp_device *sp, irq_handler_t handler,
> const char *name, void *data);
> @@ -134,7 +134,7 @@ struct sp_device *sp_get_psp_master_device(void);
> int ccp_dev_init(struct sp_device *sp);
> void ccp_dev_destroy(struct sp_device *sp);
>
> -int ccp_dev_suspend(struct sp_device *sp, pm_message_t state);
> +int ccp_dev_suspend(struct sp_device *sp);
> int ccp_dev_resume(struct sp_device *sp);
>
> #else /* !CONFIG_CRYPTO_DEV_SP_CCP */
> @@ -145,7 +145,7 @@ static inline int ccp_dev_init(struct sp_device *sp)
> }
> static inline void ccp_dev_destroy(struct sp_device *sp) { }
>
> -static inline int ccp_dev_suspend(struct sp_device *sp, pm_message_t state)
> +static inline int ccp_dev_suspend(struct sp_device *sp)
> {
> return 0;
> }
> diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c
> index cb6cb47053f4..f471dbaef1fb 100644
> --- a/drivers/crypto/ccp/sp-pci.c
> +++ b/drivers/crypto/ccp/sp-pci.c
> @@ -252,23 +252,19 @@ static void sp_pci_remove(struct pci_dev *pdev)
> sp_free_irqs(sp);
> }
>
> -#ifdef CONFIG_PM
> -static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
> +static int __maybe_unused sp_pci_suspend(struct device *dev)
> {
> - struct device *dev = &pdev->dev;
> struct sp_device *sp = dev_get_drvdata(dev);
>
> - return sp_suspend(sp, state);
> + return sp_suspend(sp);
> }
>
> -static int sp_pci_resume(struct pci_dev *pdev)
> +static int __maybe_unused sp_pci_resume(struct device *dev)
> {
> - struct device *dev = &pdev->dev;
> struct sp_device *sp = dev_get_drvdata(dev);
>
> return sp_resume(sp);
> }
> -#endif
>
> #ifdef CONFIG_CRYPTO_DEV_SP_PSP
> static const struct sev_vdata sevv1 = {
> @@ -365,15 +361,14 @@ static const struct pci_device_id sp_pci_table[] = {
> };
> MODULE_DEVICE_TABLE(pci, sp_pci_table);
>
> +static SIMPLE_DEV_PM_OPS(sp_pci_pm_ops, sp_pci_suspend, sp_pci_resume);
> +
> static struct pci_driver sp_pci_driver = {
> .name = "ccp",
> .id_table = sp_pci_table,
> .probe = sp_pci_probe,
> .remove = sp_pci_remove,
> -#ifdef CONFIG_PM
> - .suspend = sp_pci_suspend,
> - .resume = sp_pci_resume,
> -#endif
> + .driver.pm = &sp_pci_pm_ops,
> };
>
> int sp_pci_init(void)
> diff --git a/drivers/crypto/ccp/sp-platform.c b/drivers/crypto/ccp/sp-platform.c
> index 831aac1393a2..9dba52fbee99 100644
> --- a/drivers/crypto/ccp/sp-platform.c
> +++ b/drivers/crypto/ccp/sp-platform.c
This file use the same "#ifdef CONFIG_PM" to define the suspend and resume
functions (see sp_platform_driver variable). Doesn't that need to be
updated similar to sp-pci.c? Not sure how this compile tested successfully
unless your kernel config didn't have CONFIG_PM defined?
Thanks,
Tom
> @@ -207,7 +207,7 @@ static int sp_platform_suspend(struct platform_device *pdev,
> struct device *dev = &pdev->dev;
> struct sp_device *sp = dev_get_drvdata(dev);
>
> - return sp_suspend(sp, state);
> + return sp_suspend(sp);
> }
>
> static int sp_platform_resume(struct platform_device *pdev)
>
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