Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 1 May 2023 13:38:41 -0500 | Subject | Re: [PATCH v2 02/10] crypto: ccp: Add support for displaying PSP firmware versions | From | Tom Lendacky <> |
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On 4/28/23 13:55, Mario Limonciello wrote: > As it's not always obvious what PSP bootloader or TEE version are > present in OEM systems, add the ability to get this information from > sysfs for supported platforms. > > Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
> --- > v1->v2: > * Move GENMASK declarations to top of the file > * Add comment to support why checking for 0xffffffff > --- > Documentation/ABI/testing/sysfs-driver-ccp | 18 ++++++ > drivers/crypto/ccp/sp-dev.h | 2 + > drivers/crypto/ccp/sp-pci.c | 64 ++++++++++++++++++++++ > 3 files changed, 84 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-driver-ccp b/Documentation/ABI/testing/sysfs-driver-ccp > index 7aded9b75553..ee6b787eee7a 100644 > --- a/Documentation/ABI/testing/sysfs-driver-ccp > +++ b/Documentation/ABI/testing/sysfs-driver-ccp > @@ -85,3 +85,21 @@ Description: > Possible values: > 0: Not enforced > 1: Enforced > + > +What: /sys/bus/pci/devices/<BDF>/bootloader_version > +Date: June 2023 > +KernelVersion: 6.4 > +Contact: mario.limonciello@amd.com > +Description: > + The /sys/bus/pci/devices/<BDF>/bootloader_version > + file reports the firmware version of the AMD AGESA > + bootloader. > + > +What: /sys/bus/pci/devices/<BDF>/tee_version > +Date: June 2023 > +KernelVersion: 6.4 > +Contact: mario.limonciello@amd.com > +Description: > + The /sys/bus/pci/devices/<BDF>/tee_version > + file reports the firmware version of the AMD Trusted > + Execution Environment (TEE). > diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h > index 1253a0217985..76c32ee6bd65 100644 > --- a/drivers/crypto/ccp/sp-dev.h > +++ b/drivers/crypto/ccp/sp-dev.h > @@ -51,6 +51,7 @@ struct tee_vdata { > const unsigned int cmdbuff_addr_hi_reg; > const unsigned int ring_wptr_reg; > const unsigned int ring_rptr_reg; > + const unsigned int info_reg; > }; > > struct platform_access_vdata { > @@ -69,6 +70,7 @@ struct psp_vdata { > const unsigned int feature_reg; > const unsigned int inten_reg; > const unsigned int intsts_reg; > + const unsigned int bootloader_info_reg; > }; > > /* Structure to hold SP device data */ > diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c > index 85e3dc8853e2..7ef7c09b4a2f 100644 > --- a/drivers/crypto/ccp/sp-pci.c > +++ b/drivers/crypto/ccp/sp-pci.c > @@ -8,6 +8,7 @@ > * Author: Gary R Hook <gary.hook@amd.com> > */ > > +#include <linux/bitfield.h> > #include <linux/module.h> > #include <linux/kernel.h> > #include <linux/device.h> > @@ -24,6 +25,12 @@ > #include "ccp-dev.h" > #include "psp-dev.h" > > +/* used for version string AA.BB.CC.DD */ > +#define AA GENMASK(31, 24) > +#define BB GENMASK(23, 16) > +#define CC GENMASK(15, 8) > +#define DD GENMASK(7, 0) > + > #define MSIX_VECTORS 2 > > struct sp_pci { > @@ -88,8 +95,65 @@ static struct attribute_group psp_security_attr_group = { > .is_visible = psp_security_is_visible, > }; > > +#define version_attribute_show(name, _offset) \ > +static ssize_t name##_show(struct device *d, struct device_attribute *attr, \ > + char *buf) \ > +{ \ > + struct sp_device *sp = dev_get_drvdata(d); \ > + struct psp_device *psp = sp->psp_data; \ > + unsigned int val = ioread32(psp->io_regs + _offset); \ > + return sysfs_emit(buf, "%02lx.%02lx.%02lx.%02lx\n", \ > + FIELD_GET(AA, val), \ > + FIELD_GET(BB, val), \ > + FIELD_GET(CC, val), \ > + FIELD_GET(DD, val)); \ > +} > + > +version_attribute_show(bootloader_version, psp->vdata->bootloader_info_reg) > +static DEVICE_ATTR_RO(bootloader_version); > +version_attribute_show(tee_version, psp->vdata->tee->info_reg) > +static DEVICE_ATTR_RO(tee_version); > + > +static struct attribute *psp_firmware_attrs[] = { > + &dev_attr_bootloader_version.attr, > + &dev_attr_tee_version.attr, > + NULL, > +}; > + > +static umode_t psp_firmware_is_visible(struct kobject *kobj, struct attribute *attr, int idx) > +{ > + struct device *dev = kobj_to_dev(kobj); > + struct sp_device *sp = dev_get_drvdata(dev); > + struct psp_device *psp = sp->psp_data; > + unsigned int val = 0xffffffff; > + > + if (!psp) > + return 0; > + > + if (attr == &dev_attr_bootloader_version.attr && > + psp->vdata->bootloader_info_reg) > + val = ioread32(psp->io_regs + psp->vdata->bootloader_info_reg); > + > + if (attr == &dev_attr_tee_version.attr && > + psp->capability & PSP_CAPABILITY_TEE && > + psp->vdata->tee->info_reg) > + val = ioread32(psp->io_regs + psp->vdata->tee->info_reg); > + > + /* If platform disallows accessing this register it will be all f's */ > + if (val != 0xffffffff) > + return 0444; > + > + return 0; > +} > + > +static struct attribute_group psp_firmware_attr_group = { > + .attrs = psp_firmware_attrs, > + .is_visible = psp_firmware_is_visible, > +}; > + > static const struct attribute_group *psp_groups[] = { > &psp_security_attr_group, > + &psp_firmware_attr_group, > NULL, > }; >
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