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Update smmstore patches

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This commit is contained in:
Jeremy Soller
2019-09-26 15:00:18 -06:00
parent 57c382c424
commit 00b6224b65
3 changed files with 92 additions and 71 deletions
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153
src/drivers/smmstore/store.c
View File

@@ -13,7 +13,6 @@
* GNU General Public License for more details.
*/
#include <stdlib.h>
#include <boot_device.h>
#include <cbfs.h>
#include <fmap.h>
@@ -44,6 +43,33 @@
* crash/reboot could clear out all variables.
*/
static int lookup_store_region(struct region *region)
{
if (CONFIG(SMMSTORE_IN_CBFS)) {
struct cbfsf file;
if (cbfs_locate_file_in_region(&file,
CONFIG_SMMSTORE_REGION,
CONFIG_SMMSTORE_FILENAME, NULL) < 0) {
printk(BIOS_WARNING,
"smm store: Unable to find SMM store file in region '%s'\n",
CONFIG_SMMSTORE_REGION);
return -1;
}
struct region_device rdev;
cbfs_file_data(&rdev, &file);
*region = *region_device_region(&rdev);
} else {
if (fmap_locate_area(CONFIG_SMMSTORE_REGION, region)) {
printk(BIOS_WARNING,
"smm store: Unable to find SMM store FMAP region '%s'\n",
CONFIG_SMMSTORE_REGION);
return -1;
}
}
return 0;
}
/*
* Return a region device that points into the store file.
*
@@ -58,28 +84,26 @@
*/
static int lookup_store(struct region_device *rstore)
{
struct cbfsf file;
if (CONFIG(SMMSTORE_IN_CBFS)) {
if (cbfs_locate_file_in_region(&file,
CONFIG_SMMSTORE_REGION,
CONFIG_SMMSTORE_FILENAME, NULL) < 0) {
printk(BIOS_WARNING,
"smm store: Unable to find SMM store file in region '%s'\n",
CONFIG_SMMSTORE_REGION);
return -1;
}
static struct region_device read_rdev, write_rdev;
static struct incoherent_rdev store_irdev;
struct region region;
const struct region_device *rdev;
cbfs_file_data(rstore, &file);
} else {
if (fmap_locate_area_as_rdev_rw(CONFIG_SMMSTORE_REGION, rstore)) {
printk(BIOS_WARNING,
"smm store: Unable to find SMM store FMAP region '%s'\n",
CONFIG_SMMSTORE_REGION);
return -1;
}
}
if (lookup_store_region(&region))
return -1;
return 0;
if (boot_device_ro_subregion(&region, &read_rdev) < 0)
return -1;
if (boot_device_rw_subregion(&region, &write_rdev) < 0)
return -1;
rdev = incoherent_rdev_init(&store_irdev, &region, &read_rdev, &write_rdev);
if (rdev == NULL)
return -1;
return rdev_chain(rstore, rdev, 0, region_device_sz(rdev));
}
/*
@@ -88,7 +112,7 @@ static int lookup_store(struct region_device *rstore)
* returns 0 on success, -1 on failure
* writes up to `*bufsize` bytes into `buf` and updates `*bufsize`
*/
int smmstore_read_region(void *buf, uint32_t *bufsize)
int smmstore_read_region(void *buf, ssize_t *bufsize)
{
struct region_device store;
@@ -100,33 +124,26 @@ int smmstore_read_region(void *buf, uint32_t *bufsize)
return -1;
}
ssize_t tx = min(*bufsize, region_device_sz(&store));
ssize_t count = rdev_readat(&store, buf, 0, tx);
if (count < 0)
ssize_t tx = MIN(*bufsize, region_device_sz(&store));
*bufsize = rdev_readat(&store, buf, 0, tx);
if (*bufsize < 0)
return -1;
*bufsize = (uint32_t)count;
return 0;
}
static enum cb_err scan_end(ssize_t *end)
static enum cb_err scan_end(struct region_device *store)
{
struct region_device store;
if (lookup_store(&store) < 0) {
printk(BIOS_WARNING, "reading region failed\n");
return CB_ERR;
}
ssize_t data_sz = region_device_sz(&store);
/* scan for end */
*end = 0;
ssize_t end = 0;
uint32_t k_sz, v_sz;
while (*end < data_sz) {
const ssize_t data_sz = region_device_sz(store);
while (end < data_sz) {
/* make odd corner cases identifiable, eg. invalid v_sz */
k_sz = 0;
if (rdev_readat(&store, &k_sz, *end, sizeof(k_sz)) < 0) {
if (rdev_readat(store, &k_sz, end, sizeof(k_sz)) < 0) {
printk(BIOS_WARNING, "failed reading key size\n");
return CB_ERR;
}
@@ -144,7 +161,7 @@ static enum cb_err scan_end(ssize_t *end)
return CB_ERR;
}
if (rdev_readat(&store, &v_sz, *end + 4, sizeof(v_sz)) < 0) {
if (rdev_readat(store, &v_sz, end + sizeof(k_sz), sizeof(v_sz)) < 0) {
printk(BIOS_WARNING, "failed reading value size\n");
return CB_ERR;
}
@@ -154,11 +171,11 @@ static enum cb_err scan_end(ssize_t *end)
return CB_ERR;
}
*end += sizeof(k_sz) + sizeof(v_sz) + k_sz + v_sz + 1;
*end = ALIGN_UP(*end, sizeof(uint32_t));
end += sizeof(k_sz) + sizeof(v_sz) + k_sz + v_sz + 1;
end = ALIGN_UP(end, sizeof(uint32_t));
}
printk(BIOS_DEBUG, "used smm store size might be 0x%zx bytes\n", *end);
printk(BIOS_DEBUG, "used smm store size might be 0x%zx bytes\n", end);
if (k_sz != 0xffffffff) {
printk(BIOS_WARNING,
@@ -166,6 +183,9 @@ static enum cb_err scan_end(ssize_t *end)
return CB_ERR;
}
if (rdev_chain(store, store, end, data_sz - end))
return CB_ERR;
return CB_SUCCESS;
}
@@ -174,8 +194,8 @@ static enum cb_err scan_end(ssize_t *end)
*
* Returns 0 on success, -1 on failure
*/
int smmstore_append_data(void *key, uint32_t key_sz,
void *value, uint32_t value_sz)
int smmstore_append_data(void *key, uint32_t key_sz, void *value,
uint32_t value_sz)
{
struct region_device store;
@@ -184,48 +204,49 @@ int smmstore_append_data(void *key, uint32_t key_sz,
return -1;
}
ssize_t end;
if (scan_end(&end) == CB_ERR)
ssize_t offset = 0;
ssize_t size;
uint8_t nul = 0;
if (scan_end(&store) != CB_SUCCESS)
return -1;
printk(BIOS_DEBUG, "used size looks legit\n");
printk(BIOS_DEBUG, "open (%zx, %zx) for writing\n",
region_device_offset(&store), region_device_sz(&store));
if (boot_device_rw_subregion(region_device_region(&store), &store) < 0) {
printk(BIOS_WARNING, "couldn't open store for writing\n");
return -1;
}
struct region subregion = {
.offset = end,
.size = sizeof(key_sz) + sizeof(value_sz) + key_sz + value_sz + 1,
};
if (region_is_subregion(region_device_region(&store), &subregion)) {
size = sizeof(key_sz) + sizeof(value_sz) + key_sz + value_sz
+ sizeof(nul);
if (rdev_chain(&store, &store, 0, size)) {
printk(BIOS_WARNING, "not enough space for new data\n");
return -1;
}
if (rdev_writeat(&store, &key_sz, end, sizeof(key_sz)) != sizeof(key_sz)) {
if (rdev_writeat(&store, &key_sz, offset, sizeof(key_sz))
!= sizeof(key_sz)) {
printk(BIOS_WARNING, "failed writing key size\n");
return -1;
}
end += sizeof(key_sz);
if (rdev_writeat(&store, &value_sz, end, sizeof(value_sz)) != sizeof(key_sz)) {
offset += sizeof(key_sz);
if (rdev_writeat(&store, &value_sz, offset, sizeof(value_sz))
!= sizeof(value_sz)) {
printk(BIOS_WARNING, "failed writing value size\n");
return -1;
}
end += sizeof(value_sz);
if (rdev_writeat(&store, key, end, key_sz) != key_sz) {
offset += sizeof(value_sz);
if (rdev_writeat(&store, key, offset, key_sz) != key_sz) {
printk(BIOS_WARNING, "failed writing key data\n");
return -1;
}
end += key_sz;
if (rdev_writeat(&store, value, end, value_sz) != value_sz) {
offset += key_sz;
if (rdev_writeat(&store, value, offset, value_sz) != value_sz) {
printk(BIOS_WARNING, "failed writing value data\n");
return -1;
}
end += value_sz;
uint8_t nul = 0;
if (rdev_writeat(&store, &nul, end, sizeof(nul)) != sizeof(nul)) {
offset += value_sz;
if (rdev_writeat(&store, &nul, offset, sizeof(nul)) != sizeof(nul)) {
printk(BIOS_WARNING, "failed writing termination\n");
return -1;
}
return 0;

8
src/include/smmstore.h
View File

@@ -29,21 +29,21 @@
struct smmstore_params_read {
void *buf;
uint32_t bufsize;
ssize_t bufsize;
};
struct smmstore_params_append {
void *key;
uint32_t keysize;
size_t keysize;
void *val;
uint32_t valsize;
size_t valsize;
};
/* SMM responder */
uint32_t smmstore_exec(uint8_t command, void *param);
/* implementation */
int smmstore_read_region(void *buf, uint32_t *bufsize);
int smmstore_read_region(void *buf, ssize_t *bufsize);
int smmstore_append_data(void *key, uint32_t key_sz,
void *value, uint32_t value_sz);
int smmstore_clear_region(void);

2
src/soc/intel/common/block/smm/smihandler.c
View File

@@ -313,7 +313,7 @@ static void southbridge_smi_store(
reg_ebx = save_state_ops->get_reg(io_smi, RBX);
/* drivers/smmstore/smi.c */
ret = smmstore_exec(sub_command, (uintptr_t *)reg_ebx);
ret = smmstore_exec(sub_command, (void *)reg_ebx);
save_state_ops->set_reg(io_smi, RAX, ret);
}