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platform/x86/intel/sdsi: Support different GUIDs 

Newer versions of Intel On Demand hardware may have an expanded list of
registers to support new features. The register layout is identified by a
unique GUID that's read during driver probe. Add support for handling
different GUIDs and add support for current GUIDs [1].

Link: https://github.com/intel/intel-sdsi/blob/master/os-interface.rst [1]
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20221119002343.1281885-4-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
David E. Box 2022-11-18 16:23:37 -08:00 committed by Hans de Goede
parent aa546b2816
commit 25612c0fb2
1 changed files with 47 additions and 3 deletions
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50
drivers/platform/x86/intel/sdsi.c
View File

@ -27,9 +27,8 @@
#define ACCESS_TYPE_LOCAL 3
#define SDSI_MIN_SIZE_DWORDS 276
#define SDSI_SIZE_CONTROL 8
#define SDSI_SIZE_MAILBOX 1024
#define SDSI_SIZE_REGS 72
#define SDSI_SIZE_REGS 80
#define SDSI_SIZE_CMD sizeof(u64)
/*
@ -76,6 +75,13 @@
#define DT_TBIR GENMASK(2, 0)
#define DT_OFFSET(v) ((v) & GENMASK(31, 3))
#define SDSI_GUID_V1 0x006DD191
#define GUID_V1_CNTRL_SIZE 8
#define GUID_V1_REGS_SIZE 72
#define SDSI_GUID_V2 0xF210D9EF
#define GUID_V2_CNTRL_SIZE 16
#define GUID_V2_REGS_SIZE 80
enum sdsi_command {
SDSI_CMD_PROVISION_AKC = 0x04,
SDSI_CMD_PROVISION_CAP = 0x08,
@ -100,6 +106,9 @@ struct sdsi_priv {
void __iomem *control_addr;
void __iomem *mbox_addr;
void __iomem *regs_addr;
int control_size;
int maibox_size;
int registers_size;
u32 guid;
u32 features;
};
@ -444,6 +453,18 @@ static ssize_t registers_read(struct file *filp, struct kobject *kobj,
struct device *dev = kobj_to_dev(kobj);
struct sdsi_priv *priv = dev_get_drvdata(dev);
void __iomem *addr = priv->regs_addr;
int size = priv->registers_size;
/*
* The check below is performed by the sysfs caller based on the static
* file size. But this may be greater than the actual size which is based
* on the GUID. So check here again based on actual size before reading.
*/
if (off >= size)
return 0;
if (off + count > size)
count = size - off;
memcpy_fromio(buf, addr + off, count);
@ -496,6 +517,24 @@ static const struct attribute_group sdsi_group = {
};
__ATTRIBUTE_GROUPS(sdsi);
static int sdsi_get_layout(struct sdsi_priv *priv, struct disc_table *table)
{
switch (table->guid) {
case SDSI_GUID_V1:
priv->control_size = GUID_V1_CNTRL_SIZE;
priv->registers_size = GUID_V1_REGS_SIZE;
break;
case SDSI_GUID_V2:
priv->control_size = GUID_V2_CNTRL_SIZE;
priv->registers_size = GUID_V2_REGS_SIZE;
break;
default:
dev_err(priv->dev, "Unrecognized GUID 0x%x\n", table->guid);
return -EINVAL;
}
return 0;
}
static int sdsi_map_mbox_registers(struct sdsi_priv *priv, struct pci_dev *parent,
struct disc_table *disc_table, struct resource *disc_res)
{
@ -537,7 +576,7 @@ static int sdsi_map_mbox_registers(struct sdsi_priv *priv, struct pci_dev *paren
if (IS_ERR(priv->control_addr))
return PTR_ERR(priv->control_addr);
priv->mbox_addr = priv->control_addr + SDSI_SIZE_CONTROL;
priv->mbox_addr = priv->control_addr + priv->control_size;
priv->regs_addr = priv->mbox_addr + SDSI_SIZE_MAILBOX;
priv->features = readq(priv->regs_addr + SDSI_ENABLED_FEATURES_OFFSET);
@ -572,6 +611,11 @@ static int sdsi_probe(struct auxiliary_device *auxdev, const struct auxiliary_de
priv->guid = disc_table.guid;
/* Get guid based layout info */
ret = sdsi_get_layout(priv, &disc_table);
if (ret)
return ret;
/* Map the SDSi mailbox registers */
ret = sdsi_map_mbox_registers(priv, intel_cap_dev->pcidev, &disc_table, disc_res);
if (ret)