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crypto: ccp - Add support for fetching a nonce for dynamic boost control

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Dynamic Boost Control is a feature offered on AMD client platforms that
allows software to request and set power or frequency limits.

Only software that has authenticated with the PSP can retrieve or set
these limits.

Create a character device and ioctl for fetching the nonce. This ioctl
supports optionally passing authentication information which will influence
how many calls the nonce is valid for.

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
2023-06-23 08:49:55 -05:00
committed by Herbert Xu
parent b8440d55f7
commit c04cf9e14f
9 changed files with 321 additions and 1 deletions
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9
drivers/crypto/ccp/psp-dev.c
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@@ -15,6 +15,7 @@
#include "sev-dev.h"
#include "tee-dev.h"
#include "platform-access.h"
#include "dbc.h"
struct psp_device *psp_master;
@@ -112,6 +113,12 @@ static void psp_init_platform_access(struct psp_device *psp)
dev_warn(psp->dev, "platform access init failed: %d\n", ret);
return;
}
/* dbc must come after platform access as it tests the feature */
ret = dbc_dev_init(psp);
if (ret)
dev_warn(psp->dev, "failed to init dynamic boost control: %d\n",
ret);
}
static int psp_init(struct psp_device *psp)
@@ -217,6 +224,8 @@ void psp_dev_destroy(struct sp_device *sp)
tee_dev_destroy(psp);
dbc_dev_destroy(psp);
platform_access_dev_destroy(psp);
sp_free_psp_irq(sp, psp);