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lib: sbi: Add sbi_domain_root_add_memregion() API 

We should allow platform support to add more root memory regions
before domains are finalized. This will help platform support to
protect critical M-mode only resources.

This patch adds sbi_domain_root_add_memregion() API for above
described purpose.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Anup Patel 2021-04-09 10:01:11 +05:30 committed by Anup Patel
parent 7495bce6f9
commit 4dc0001b09
2 changed files with 80 additions and 11 deletions
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8
include/sbi/sbi_domain.h
View File

@ -170,6 +170,14 @@ void sbi_domain_dump_all(const char *suffix);
int sbi_domain_register(struct sbi_domain *dom,
const struct sbi_hartmask *assign_mask);
/**
* Add a memory region to the root domain
* @param reg pointer to the memory region to be added
*
* @return 0 on success and negative error code on failure
*/
int sbi_domain_root_add_memregion(const struct sbi_domain_memregion *reg);
/** Finalize domain tables and startup non-root domains */
int sbi_domain_finalize(struct sbi_scratch *scratch, u32 cold_hartid);

83
lib/sbi/sbi_domain.c
View File

@ -24,10 +24,10 @@ static bool domain_finalized = false;
static struct sbi_hartmask root_hmask = { 0 };
#define ROOT_FW_REGION 0
#define ROOT_ALL_REGION 1
#define ROOT_END_REGION 2
static struct sbi_domain_memregion root_memregs[ROOT_END_REGION + 1] = { 0 };
#define ROOT_REGION_MAX 16
static u32 root_memregs_count = 0;
static struct sbi_domain_memregion root_fw_region;
static struct sbi_domain_memregion root_memregs[ROOT_REGION_MAX + 1] = { 0 };
static struct sbi_domain root = {
.name = "root",
@ -69,7 +69,7 @@ void sbi_domain_memregion_initfw(struct sbi_domain_memregion *reg)
if (!reg)
return;
sbi_memcpy(reg, &root_memregs[ROOT_FW_REGION], sizeof(*reg));
sbi_memcpy(reg, &root_fw_region, sizeof(*reg));
}
void sbi_domain_memregion_init(unsigned long addr,
@ -236,9 +236,9 @@ static int sanitize_domain(const struct sbi_platform *plat,
count = 0;
have_fw_reg = FALSE;
sbi_domain_for_each_memregion(dom, reg) {
if (reg->order == root_memregs[ROOT_FW_REGION].order &&
reg->base == root_memregs[ROOT_FW_REGION].base &&
reg->flags == root_memregs[ROOT_FW_REGION].flags)
if (reg->order == root_fw_region.order &&
reg->base == root_fw_region.base &&
reg->flags == root_fw_region.flags)
have_fw_reg = TRUE;
count++;
}
@ -468,6 +468,66 @@ int sbi_domain_register(struct sbi_domain *dom,
return 0;
}
int sbi_domain_root_add_memregion(const struct sbi_domain_memregion *reg)
{
int rc;
bool reg_merged;
struct sbi_domain_memregion *nreg, *nreg1, *nreg2;
const struct sbi_platform *plat = sbi_platform_thishart_ptr();
/* Sanity checks */
if (!reg || domain_finalized ||
(root.regions != root_memregs) ||
(ROOT_REGION_MAX <= root_memregs_count))
return SBI_EINVAL;
/* Check for conflicts */
sbi_domain_for_each_memregion(&root, nreg) {
if (is_region_conflict(reg, nreg))
return SBI_EINVAL;
}
/* Append the memregion to root memregions */
nreg = &root_memregs[root_memregs_count];
sbi_memcpy(nreg, reg, sizeof(*reg));
root_memregs_count++;
root_memregs[root_memregs_count].order = 0;
/* Sort and optimize root regions */
do {
/* Sanitize the root domain so that memregions are sorted */
rc = sanitize_domain(plat, &root);
if (rc) {
sbi_printf("%s: sanity checks failed for"
" %s (error %d)\n", __func__,
root.name, rc);
return rc;
}
/* Merge consecutive memregions with same order and flags */
reg_merged = false;
sbi_domain_for_each_memregion(&root, nreg) {
nreg1 = nreg + 1;
if (!nreg1->order)
continue;
if ((nreg->base + BIT(nreg->order)) == nreg1->base &&
nreg->order == nreg1->order &&
nreg->flags == nreg1->flags) {
nreg->order++;
while (nreg1->order) {
nreg2 = nreg1 + 1;
sbi_memcpy(nreg1, nreg2, sizeof(*nreg1));
nreg1++;
}
reg_merged = true;
}
}
} while (reg_merged);
return 0;
}
int sbi_domain_finalize(struct sbi_scratch *scratch, u32 cold_hartid)
{
int rc;
@ -537,17 +597,18 @@ int sbi_domain_init(struct sbi_scratch *scratch, u32 cold_hartid)
/* Root domain firmware memory region */
sbi_domain_memregion_init(scratch->fw_start, scratch->fw_size, 0,
&root_memregs[ROOT_FW_REGION]);
&root_fw_region);
sbi_domain_memregion_initfw(&root_memregs[root_memregs_count++]);
/* Root domain allow everything memory region */
sbi_domain_memregion_init(0, ~0UL,
(SBI_DOMAIN_MEMREGION_READABLE |
SBI_DOMAIN_MEMREGION_WRITEABLE |
SBI_DOMAIN_MEMREGION_EXECUTABLE),
&root_memregs[ROOT_ALL_REGION]);
&root_memregs[root_memregs_count++]);
/* Root domain memory region end */
root_memregs[ROOT_END_REGION].order = 0;
root_memregs[root_memregs_count].order = 0;
/* Use platform specific root memory regions when available */
memregs = sbi_platform_domains_root_regions(plat);