[PATCH v4 3/5] crypto: ccp - Add an S4 restore flow

["Mario Limonciello (AMD)" <superm1@kernel.org>]

The system will have lost power during S4.  The ring used for TEE
communications needs to be initialized before use.

Fixes: f892a21f51162 ("crypto: ccp - use generic power management")
Reported-by: Lars Francke <lars.francke@gmail.com>
Closes: https://lore.kernel.org/platform-driver-x86/CAD-Ua_gfJnQSo8ucS_7ZwzuhoBRJ14zXP7s8b-zX3ZcxcyWePw@mail.gmail.com/
Tested-by: Yijun Shen <Yijun.Shen@Dell.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
---
v4:
 * Add tag (Yijun)
 * Remove blank line (Ilpo)
 * Adjust whitespace in psp_restore() (Ilpo)
---
 drivers/crypto/ccp/psp-dev.c | 11 +++++++++++
 drivers/crypto/ccp/sp-dev.h  |  2 ++
 drivers/crypto/ccp/sp-pci.c  | 24 +++++++++++++++++++++++-
 drivers/crypto/ccp/tee-dev.c |  5 +++++
 drivers/crypto/ccp/tee-dev.h |  1 +
 5 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 9e21da0e298ad..46072ff84f716 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -351,6 +351,17 @@ struct psp_device *psp_get_master_device(void)
 	return sp ? sp->psp_data : NULL;
 }
 
+int psp_restore(struct sp_device *sp)
+{
+	struct psp_device *psp = sp->psp_data;
+	int ret = 0;
+
+	if (psp->tee_data)
+		ret = tee_restore(psp);
+
+	return 0;
+}
+
 void psp_pci_init(void)
 {
 	psp_master = psp_get_master_device();
diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h
index 1335a83fe052e..0deea1a399e47 100644
--- a/drivers/crypto/ccp/sp-dev.h
+++ b/drivers/crypto/ccp/sp-dev.h
@@ -174,6 +174,7 @@ int psp_dev_init(struct sp_device *sp);
 void psp_pci_init(void);
 void psp_dev_destroy(struct sp_device *sp);
 void psp_pci_exit(void);
+int psp_restore(struct sp_device *sp);
 
 #else /* !CONFIG_CRYPTO_DEV_SP_PSP */
 
@@ -181,6 +182,7 @@ static inline int psp_dev_init(struct sp_device *sp) { return 0; }
 static inline void psp_pci_init(void) { }
 static inline void psp_dev_destroy(struct sp_device *sp) { }
 static inline void psp_pci_exit(void) { }
+static inline int psp_restore(struct sp_device *sp) { return 0; }
 
 #endif /* CONFIG_CRYPTO_DEV_SP_PSP */
 
diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c
index 8891ceee1d7d0..931ec6bf2cec6 100644
--- a/drivers/crypto/ccp/sp-pci.c
+++ b/drivers/crypto/ccp/sp-pci.c
@@ -353,6 +353,21 @@ static int __maybe_unused sp_pci_resume(struct device *dev)
 	return sp_resume(sp);
 }
 
+static int __maybe_unused sp_pci_restore(struct device *dev)
+{
+	struct sp_device *sp = dev_get_drvdata(dev);
+
+#ifdef CONFIG_CRYPTO_DEV_SP_PSP
+	if (sp->psp_data) {
+		int ret = psp_restore(sp);
+
+		if (ret)
+			return ret;
+	}
+#endif
+	return sp_resume(sp);
+}
+
 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
 static const struct sev_vdata sevv1 = {
 	.cmdresp_reg		= 0x10580,	/* C2PMSG_32 */
@@ -563,7 +578,14 @@ 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 const struct dev_pm_ops sp_pci_pm_ops = {
+	.suspend = pm_sleep_ptr(sp_pci_suspend),
+	.resume = pm_sleep_ptr(sp_pci_resume),
+	.freeze = pm_sleep_ptr(sp_pci_suspend),
+	.thaw = pm_sleep_ptr(sp_pci_resume),
+	.poweroff = pm_sleep_ptr(sp_pci_suspend),
+	.restore_early = pm_sleep_ptr(sp_pci_restore),
+};
 
 static struct pci_driver sp_pci_driver = {
 	.name = "ccp",
diff --git a/drivers/crypto/ccp/tee-dev.c b/drivers/crypto/ccp/tee-dev.c
index af881daa5855b..11c4b05e2f3a2 100644
--- a/drivers/crypto/ccp/tee-dev.c
+++ b/drivers/crypto/ccp/tee-dev.c
@@ -366,3 +366,8 @@ int psp_check_tee_status(void)
 	return 0;
 }
 EXPORT_SYMBOL(psp_check_tee_status);
+
+int tee_restore(struct psp_device *psp)
+{
+	return tee_init_ring(psp->tee_data);
+}
diff --git a/drivers/crypto/ccp/tee-dev.h b/drivers/crypto/ccp/tee-dev.h
index ea9a2b7c05f57..c23416cb7bb37 100644
--- a/drivers/crypto/ccp/tee-dev.h
+++ b/drivers/crypto/ccp/tee-dev.h
@@ -111,5 +111,6 @@ struct tee_ring_cmd {
 
 int tee_dev_init(struct psp_device *psp);
 void tee_dev_destroy(struct psp_device *psp);
+int tee_restore(struct psp_device *psp);
 
 #endif /* __TEE_DEV_H__ */
-- 
2.43.0