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crypto: ccp - cache capability into psp device

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The results of the capability register will be used by future
code at runtime rather than just initialization.

Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mario Limonciello 2022-03-31 16:12:10 -05:00 committed by Herbert Xu
parent f17f9e9069
commit cac32cd4f1
2 changed files with 22 additions and 20 deletions
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37
drivers/crypto/ccp/psp-dev.c
View File

@ -70,17 +70,17 @@ static unsigned int psp_get_capability(struct psp_device *psp)
*/
if (val == 0xffffffff) {
dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n");
return 0;
return -ENODEV;
}
psp->capability = val;
return val;
return 0;
}
static int psp_check_sev_support(struct psp_device *psp,
unsigned int capability)
static int psp_check_sev_support(struct psp_device *psp)
{
/* Check if device supports SEV feature */
if (!(capability & 1)) {
if (!(psp->capability & PSP_CAPABILITY_SEV)) {
dev_dbg(psp->dev, "psp does not support SEV\n");
return -ENODEV;
}
@ -88,11 +88,10 @@ static int psp_check_sev_support(struct psp_device *psp,
return 0;
}
static int psp_check_tee_support(struct psp_device *psp,
unsigned int capability)
static int psp_check_tee_support(struct psp_device *psp)
{
/* Check if device supports TEE feature */
if (!(capability & 2)) {
if (!(psp->capability & PSP_CAPABILITY_TEE)) {
dev_dbg(psp->dev, "psp does not support TEE\n");
return -ENODEV;
}
@ -100,11 +99,10 @@ static int psp_check_tee_support(struct psp_device *psp,
return 0;
}
static int psp_check_support(struct psp_device *psp,
unsigned int capability)
static int psp_check_support(struct psp_device *psp)
{
int sev_support = psp_check_sev_support(psp, capability);
int tee_support = psp_check_tee_support(psp, capability);
int sev_support = psp_check_sev_support(psp);
int tee_support = psp_check_tee_support(psp);
/* Return error if device neither supports SEV nor TEE */
if (sev_support && tee_support)
@ -113,17 +111,17 @@ static int psp_check_support(struct psp_device *psp,
return 0;
}
static int psp_init(struct psp_device *psp, unsigned int capability)
static int psp_init(struct psp_device *psp)
{
int ret;
if (!psp_check_sev_support(psp, capability)) {
if (!psp_check_sev_support(psp)) {
ret = sev_dev_init(psp);
if (ret)
return ret;
}
if (!psp_check_tee_support(psp, capability)) {
if (!psp_check_tee_support(psp)) {
ret = tee_dev_init(psp);
if (ret)
return ret;
@ -136,7 +134,6 @@ int psp_dev_init(struct sp_device *sp)
{
struct device *dev = sp->dev;
struct psp_device *psp;
unsigned int capability;
int ret;
ret = -ENOMEM;
@ -155,11 +152,11 @@ int psp_dev_init(struct sp_device *sp)
psp->io_regs = sp->io_map;
capability = psp_get_capability(psp);
if (!capability)
ret = psp_get_capability(psp);
if (ret)
goto e_disable;
ret = psp_check_support(psp, capability);
ret = psp_check_support(psp);
if (ret)
goto e_disable;
@ -174,7 +171,7 @@ int psp_dev_init(struct sp_device *sp)
goto e_err;
}
ret = psp_init(psp, capability);
ret = psp_init(psp);
if (ret)
goto e_irq;

5
drivers/crypto/ccp/psp-dev.h
View File

@ -45,6 +45,8 @@ struct psp_device {
void *sev_data;
void *tee_data;
unsigned int capability;
};
void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler,
@ -57,4 +59,7 @@ void psp_clear_tee_irq_handler(struct psp_device *psp);
struct psp_device *psp_get_master_device(void);
#define PSP_CAPABILITY_SEV BIT(0)
#define PSP_CAPABILITY_TEE BIT(1)
#endif /* __PSP_DEV_H */