From aa546b28163f0bd12e1129cd0fb05b89089485e9 Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Fri, 18 Nov 2022 16:23:36 -0800 Subject: [PATCH] platform/x86/intel/sdsi: Hide attributes if hardware doesn't support Provisioning capabilities are enabled by a bit set by BIOS. Read this bit and hide the provisioning attributes if the On Demand feature is not enabled. Also, remove the sdsi_enabled boolean from private and instead add a features register since this will be used for future features. Signed-off-by: David E. Box Reviewed-by: Hans de Goede Link: https://lore.kernel.org/r/20221119002343.1281885-3-david.e.box@linux.intel.com Signed-off-by: Hans de Goede --- drivers/platform/x86/intel/sdsi.c | 33 ++++++++++++++++++++++----------- 1 file changed, 22 insertions(+), 11 deletions(-) diff --git a/drivers/platform/x86/intel/sdsi.c b/drivers/platform/x86/intel/sdsi.c index 32793919473d..bca05b4dd983 100644 --- a/drivers/platform/x86/intel/sdsi.c +++ b/drivers/platform/x86/intel/sdsi.c @@ -41,7 +41,8 @@ #define SDSI_SIZE_READ_MSG (SDSI_SIZE_MAILBOX * 4) #define SDSI_ENABLED_FEATURES_OFFSET 16 -#define SDSI_ENABLED BIT(3) +#define SDSI_FEATURE_SDSI BIT(3) + #define SDSI_SOCKET_ID_OFFSET 64 #define SDSI_SOCKET_ID GENMASK(3, 0) @@ -100,7 +101,7 @@ struct sdsi_priv { void __iomem *mbox_addr; void __iomem *regs_addr; u32 guid; - bool sdsi_enabled; + u32 features; }; /* SDSi mailbox operations must be performed using 64bit mov instructions */ @@ -332,9 +333,6 @@ static ssize_t sdsi_provision(struct sdsi_priv *priv, char *buf, size_t count, struct sdsi_mbox_info info; int ret; - if (!priv->sdsi_enabled) - return -EPERM; - if (count > (SDSI_SIZE_WRITE_MSG - SDSI_SIZE_CMD)) return -EOVERFLOW; @@ -405,9 +403,6 @@ static long state_certificate_read(struct file *filp, struct kobject *kobj, size_t size; int ret; - if (!priv->sdsi_enabled) - return -EPERM; - if (off) return 0; @@ -464,6 +459,23 @@ static struct bin_attribute *sdsi_bin_attrs[] = { NULL }; +static umode_t +sdsi_battr_is_visible(struct kobject *kobj, struct bin_attribute *attr, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct sdsi_priv *priv = dev_get_drvdata(dev); + + /* Registers file is always readable if the device is present */ + if (attr == &bin_attr_registers) + return attr->attr.mode; + + /* All other attributes not visible if BIOS has not enabled On Demand */ + if (!(priv->features & SDSI_FEATURE_SDSI)) + return 0; + + return attr->attr.mode; +} + static ssize_t guid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct sdsi_priv *priv = dev_get_drvdata(dev); @@ -480,6 +492,7 @@ static struct attribute *sdsi_attrs[] = { static const struct attribute_group sdsi_group = { .attrs = sdsi_attrs, .bin_attrs = sdsi_bin_attrs, + .is_bin_visible = sdsi_battr_is_visible, }; __ATTRIBUTE_GROUPS(sdsi); @@ -490,7 +503,6 @@ static int sdsi_map_mbox_registers(struct sdsi_priv *priv, struct pci_dev *paren u32 size = FIELD_GET(DT_SIZE, disc_table->access_info); u32 tbir = FIELD_GET(DT_TBIR, disc_table->offset); u32 offset = DT_OFFSET(disc_table->offset); - u32 features_offset; struct resource res = {}; /* Starting location of SDSi MMIO region based on access type */ @@ -528,8 +540,7 @@ static int sdsi_map_mbox_registers(struct sdsi_priv *priv, struct pci_dev *paren priv->mbox_addr = priv->control_addr + SDSI_SIZE_CONTROL; priv->regs_addr = priv->mbox_addr + SDSI_SIZE_MAILBOX; - features_offset = readq(priv->regs_addr + SDSI_ENABLED_FEATURES_OFFSET); - priv->sdsi_enabled = !!(features_offset & SDSI_ENABLED); + priv->features = readq(priv->regs_addr + SDSI_ENABLED_FEATURES_OFFSET); return 0; } -- 2.11.0