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firmware: google: memconsole: Make memconsole interface more flexible 

This patch redesigns the interface between the generic memconsole driver
and its implementations to become more flexible than a flat memory
buffer with unchanging bounds. This allows memconsoles like coreboot's
to include lines that were added by runtime firmware after the driver
was initialized. Since the console log size is thus no longer static,
this means that the /sys/firmware/log file has to become unseekable.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Julius Werner 2017-05-02 15:16:29 -07:00 committed by Greg Kroah-Hartman
parent acec09e67d
commit 7918cfc46c
4 changed files with 34 additions and 17 deletions
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12
drivers/firmware/google/memconsole-coreboot.c
View File

@ -33,6 +33,14 @@ struct cbmem_cons {
static struct cbmem_cons __iomem *cbmem_console;
static ssize_t memconsole_coreboot_read(char *buf, loff_t pos, size_t count)
{
return memory_read_from_buffer(buf, count, &pos,
cbmem_console->buffer_body,
min(cbmem_console->buffer_cursor,
cbmem_console->buffer_size));
}
static int memconsole_coreboot_init(phys_addr_t physaddr)
{
struct cbmem_cons __iomem *tmp_cbmc;
@ -50,9 +58,7 @@ static int memconsole_coreboot_init(phys_addr_t physaddr)
if (!cbmem_console)
return -ENOMEM;
memconsole_setup(cbmem_console->buffer_body,
min(cbmem_console->buffer_cursor, cbmem_console->buffer_size));
memconsole_setup(memconsole_coreboot_read);
return 0;
}

18
drivers/firmware/google/memconsole-x86-legacy.c
View File

@ -48,6 +48,15 @@ struct biosmemcon_ebda {
};
} __packed;
static char *memconsole_baseaddr;
static size_t memconsole_length;
static ssize_t memconsole_read(char *buf, loff_t pos, size_t count)
{
return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr,
memconsole_length);
}
static void found_v1_header(struct biosmemcon_ebda *hdr)
{
pr_info("memconsole: BIOS console v1 EBDA structure found at %p\n",
@ -56,7 +65,9 @@ static void found_v1_header(struct biosmemcon_ebda *hdr)
hdr->v1.buffer_addr, hdr->v1.start,
hdr->v1.end, hdr->v1.num_chars);
memconsole_setup(phys_to_virt(hdr->v1.buffer_addr), hdr->v1.num_chars);
memconsole_baseaddr = phys_to_virt(hdr->v1.buffer_addr);
memconsole_length = hdr->v1.num_chars;
memconsole_setup(memconsole_read);
}
static void found_v2_header(struct biosmemcon_ebda *hdr)
@ -67,8 +78,9 @@ static void found_v2_header(struct biosmemcon_ebda *hdr)
hdr->v2.buffer_addr, hdr->v2.start,
hdr->v2.end, hdr->v2.num_bytes);
memconsole_setup(phys_to_virt(hdr->v2.buffer_addr + hdr->v2.start),
hdr->v2.end - hdr->v2.start);
memconsole_baseaddr = phys_to_virt(hdr->v2.buffer_addr + hdr->v2.start);
memconsole_length = hdr->v2.end - hdr->v2.start;
memconsole_setup(memconsole_read);
}
/*

14
drivers/firmware/google/memconsole.c
View File

@ -22,15 +22,15 @@
#include "memconsole.h"
static char *memconsole_baseaddr;
static size_t memconsole_length;
static ssize_t (*memconsole_read_func)(char *, loff_t, size_t);
static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
struct bin_attribute *bin_attr, char *buf,
loff_t pos, size_t count)
{
return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr,
memconsole_length);
if (WARN_ON_ONCE(!memconsole_read_func))
return -EIO;
return memconsole_read_func(buf, pos, count);
}
static struct bin_attribute memconsole_bin_attr = {
@ -38,16 +38,14 @@ static struct bin_attribute memconsole_bin_attr = {
.read = memconsole_read,
};
void memconsole_setup(void *baseaddr, size_t length)
void memconsole_setup(ssize_t (*read_func)(char *, loff_t, size_t))
{
memconsole_baseaddr = baseaddr;
memconsole_length = length;
memconsole_read_func = read_func;
}
EXPORT_SYMBOL(memconsole_setup);
int memconsole_sysfs_init(void)
{
memconsole_bin_attr.size = memconsole_length;
return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr);
}
EXPORT_SYMBOL(memconsole_sysfs_init);

7
drivers/firmware/google/memconsole.h
View File

@ -18,13 +18,14 @@
#ifndef __FIRMWARE_GOOGLE_MEMCONSOLE_H
#define __FIRMWARE_GOOGLE_MEMCONSOLE_H
#include <linux/types.h>
/*
* memconsole_setup
*
* Initialize the memory console from raw (virtual) base
* address and length.
* Initialize the memory console, passing the function to handle read accesses.
*/
void memconsole_setup(void *baseaddr, size_t length);
void memconsole_setup(ssize_t (*read_func)(char *, loff_t, size_t));
/*
* memconsole_sysfs_init