| Message ID | 1422278918-31477-3-git-send-email-ivan.khoronzhuk@linaro.org |
|---|---|
| State | New |
| Headers | show |
On 26 January 2015 at 13:28, Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> wrote: > There are situations when code needs to access SMBIOS entry table > area, but cannot use /dev/mem for this. As the table format is > consistent only for a version, and can be changed, use binary > attribute to give access to raw SMBIOS entry table area. > > Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > --- > drivers/firmware/dmi-sysfs.c | 42 ++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 42 insertions(+) > > diff --git a/drivers/firmware/dmi-sysfs.c b/drivers/firmware/dmi-sysfs.c > index e0f1cb3..61b6a38 100644 > --- a/drivers/firmware/dmi-sysfs.c > +++ b/drivers/firmware/dmi-sysfs.c > @@ -29,6 +29,8 @@ > #define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider > the top entry type is only 8 bits */ > > +static const u8 *smbios_raw_header; > + > struct dmi_sysfs_entry { > struct dmi_header dh; > struct kobject kobj; > @@ -646,9 +648,37 @@ static void cleanup_entry_list(void) > } > } > > +static ssize_t smbios_entry_area_raw_read(struct file *filp, > + struct kobject *kobj, > + struct bin_attribute *bin_attr, > + char *buf, loff_t pos, size_t count) > +{ > + ssize_t size; > + > + size = bin_attr->size; > + > + if (size > pos) > + size -= pos; > + else > + return 0; > + > + if (count < size) > + size = count; > + > + memcpy(buf, &smbios_raw_header[pos], size); > + > + return size; > +} > + > +static struct bin_attribute smbios_raw_area_attr = { > + .read = smbios_entry_area_raw_read, > + .attr = {.name = "smbios_raw_header", .mode = 0400}, > +}; > + > static int __init dmi_sysfs_init(void) > { > int error = -ENOMEM; > + int size; > int val; > > /* Set up our directory */ > @@ -669,6 +699,18 @@ static int __init dmi_sysfs_init(void) > goto err; > } > > + smbios_raw_header = dmi_get_smbios_entry_area(&size); > + if (!smbios_raw_header) { > + pr_debug("dmi-sysfs: SMBIOS raw data is not available.\n"); > + error = -ENODATA; > + goto err; > + } > + > + /* Create the raw binary file to access the entry area */ > + smbios_raw_area_attr.size = size; > + if (sysfs_create_bin_file(dmi_kobj, &smbios_raw_area_attr)) > + goto err; > + > pr_debug("dmi-sysfs: loaded.\n"); > > return 0; > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
diff --git a/drivers/firmware/dmi-sysfs.c b/drivers/firmware/dmi-sysfs.c index e0f1cb3..61b6a38 100644 --- a/drivers/firmware/dmi-sysfs.c +++ b/drivers/firmware/dmi-sysfs.c @@ -29,6 +29,8 @@ #define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider the top entry type is only 8 bits */ +static const u8 *smbios_raw_header; + struct dmi_sysfs_entry { struct dmi_header dh; struct kobject kobj; @@ -646,9 +648,37 @@ static void cleanup_entry_list(void) } } +static ssize_t smbios_entry_area_raw_read(struct file *filp, + struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t pos, size_t count) +{ + ssize_t size; + + size = bin_attr->size; + + if (size > pos) + size -= pos; + else + return 0; + + if (count < size) + size = count; + + memcpy(buf, &smbios_raw_header[pos], size); + + return size; +} + +static struct bin_attribute smbios_raw_area_attr = { + .read = smbios_entry_area_raw_read, + .attr = {.name = "smbios_raw_header", .mode = 0400}, +}; + static int __init dmi_sysfs_init(void) { int error = -ENOMEM; + int size; int val; /* Set up our directory */ @@ -669,6 +699,18 @@ static int __init dmi_sysfs_init(void) goto err; } + smbios_raw_header = dmi_get_smbios_entry_area(&size); + if (!smbios_raw_header) { + pr_debug("dmi-sysfs: SMBIOS raw data is not available.\n"); + error = -ENODATA; + goto err; + } + + /* Create the raw binary file to access the entry area */ + smbios_raw_area_attr.size = size; + if (sysfs_create_bin_file(dmi_kobj, &smbios_raw_area_attr)) + goto err; + pr_debug("dmi-sysfs: loaded.\n"); return 0;
There are situations when code needs to access SMBIOS entry table area, but cannot use /dev/mem for this. As the table format is consistent only for a version, and can be changed, use binary attribute to give access to raw SMBIOS entry table area. Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> --- drivers/firmware/dmi-sysfs.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)