Aaron Durbin (adurbin@google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8623
-gerrit
commit a8e45f8cb82e255bbc43d1e368a292f0d49dd043 Author: Aaron Durbin adurbin@chromium.org Date: Fri Mar 6 20:28:33 2015 -0600
coreboot: tiered imd
A tiered imd allows for both small and large allocations. The small allocations are packed into a large region. Utilizing a tiered imd reduces internal fragmentation within the imd.
Change-Id: I0bcd6473aacbc714844815b24d77cb5c542abdd0 Signed-off-by: Aaron Durbin adurbin@chromium.org --- src/include/imd.h | 18 ++- src/lib/imd.c | 424 +++++++++++++++++++++++++++++++++++++++--------------- 2 files changed, 328 insertions(+), 114 deletions(-)
diff --git a/src/include/imd.h b/src/include/imd.h index effa2da..a548b66 100644 --- a/src/include/imd.h +++ b/src/include/imd.h @@ -69,6 +69,18 @@ void imd_handle_init(struct imd *imd, void *upper_limit); int imd_create_empty(struct imd *imd, size_t root_size, size_t entry_align);
/* + * Create an empty imd with both large and small allocations. The small + * allocations come from a fixed imd stored internally within the large + * imd. The region allocated for tracking the smaller allocations is dependent + * on the small root_size and the large entry alignment by calculating the + * number of entries within the small imd and multiplying that by the small + * entry alignment. + */ +int imd_create_tiered_empty(struct imd *imd, + size_t lg_root_size, size_t lg_entry_align, + size_t sm_root_size, size_t sm_entry_align); + +/* * Recover a previously created imd. */ int imd_recover(struct imd *imd); @@ -118,9 +130,13 @@ int imd_print_entries(const struct imd *imd, const struct imd_lookup *lookup, * NOTE: Do not directly touch any fields within this structure. An imd pointer * is meant to be opaque, but the fields are exposed for stack allocation. */ -struct imd { +struct imdr { uintptr_t limit; void *r; }; +struct imd { + struct imdr lg; + struct imdr sm; +};
#endif /* _IMD_H_ */ diff --git a/src/lib/imd.c b/src/lib/imd.c index 6170050..47ff947 100644 --- a/src/lib/imd.c +++ b/src/lib/imd.c @@ -25,6 +25,7 @@
static const uint32_t IMD_ROOT_PTR_MAGIC = 0xc0389481; static const uint32_t IMD_ENTRY_MAGIC = ~0xc0389481; +static const uint32_t SMALL_REGION_ID = 0x53a11439; static const size_t LIMIT_ALIGN = 4096;
/* In-memory data structures. */ @@ -71,16 +72,16 @@ static bool imd_root_pointer_valid(const struct imd_root_pointer *rp) return !!(rp->magic == IMD_ROOT_PTR_MAGIC); }
-static struct imd_root *imd_root(const struct imd *imd) +static struct imd_root *imdr_root(const struct imdr *imdr) { - return imd->r; + return imdr->r; }
-static struct imd_root_pointer *imd_root_pointer(const struct imd *imd) +static struct imd_root_pointer *imdr_root_pointer(const struct imdr *imdr) { struct imd_root_pointer *rp;
- rp = (void *)(imd->limit - sizeof(*rp)); + rp = (void *)(imdr->limit - sizeof(*rp));
return rp; } @@ -91,13 +92,32 @@ static void imd_link_root(struct imd_root_pointer *rp, struct imd_root *r) rp->root_offset = (int32_t)((intptr_t)rp - (intptr_t)r); }
-static void imd_entry_assign(struct imd_entry *e, uint32_t id, - ssize_t offset, size_t size) +static struct imd_entry *root_last_entry(struct imd_root *r) { - e->magic = IMD_ENTRY_MAGIC; - e->start_offset = offset; - e->size = size; - e->id = id; + return &r->entries[r->num_entries - 1]; +} + +static size_t root_num_entries(size_t root_size) +{ + size_t entries_size; + + entries_size = root_size; + entries_size -= sizeof(struct imd_root_pointer); + entries_size -= sizeof(struct imd_root); + + return entries_size / sizeof(struct imd_entry); +} + +static size_t imd_root_data_left(struct imd_root *r) +{ + struct imd_entry *last_entry; + + last_entry = root_last_entry(r); + + if (r->max_offset != 0) + return last_entry->start_offset - r->max_offset; + + return ~(size_t)0; }
static bool root_is_locked(const struct imd_root *r) @@ -105,27 +125,30 @@ static bool root_is_locked(const struct imd_root *r) return !!(r->flags & IMD_FLAG_LOCKED); }
-static struct imd_entry *root_last_entry(struct imd_root *r) +static void imd_entry_assign(struct imd_entry *e, uint32_t id, + ssize_t offset, size_t size) { - return &r->entries[r->num_entries - 1]; + e->magic = IMD_ENTRY_MAGIC; + e->start_offset = offset; + e->size = size; + e->id = id; }
-/* Initialize imd handle. */ -void imd_handle_init(struct imd *imd, void *upper_limit) +static void imdr_init(struct imdr *ir, void *upper_limit) { uintptr_t limit = (uintptr_t)upper_limit; /* Upper limit is aligned down to 4KiB */ - imd->limit = ALIGN_DOWN(limit, LIMIT_ALIGN); - imd->r = NULL; + ir->limit = ALIGN_DOWN(limit, LIMIT_ALIGN); + ir->r = NULL; }
-int imd_create_empty(struct imd *imd, size_t root_size, size_t entry_align) +static int imdr_create_empty(struct imdr *imdr, size_t root_size, + size_t entry_align) { struct imd_root_pointer *rp; struct imd_root *r; struct imd_entry *e; ssize_t root_offset; - size_t entries_size;
/* root_size and entry_align should be a power of 2. */ assert(is_power_of_2(root_size)); @@ -147,24 +170,20 @@ int imd_create_empty(struct imd *imd, size_t root_size, size_t entry_align) if (entry_align > root_size) return -1;
- rp = imd_root_pointer(imd); + rp = imdr_root_pointer(imdr);
root_offset = root_size; root_offset = -root_offset; /* Set root pointer. */ - imd->r = relative_pointer((void *)imd->limit, root_offset); - r = imd_root(imd); + imdr->r = relative_pointer((void *)imdr->limit, root_offset); + r = imdr_root(imdr); imd_link_root(rp, r);
memset(r, 0, sizeof(*r)); r->entry_align = entry_align;
/* Calculate size left for entries. */ - entries_size = root_size; - entries_size -= sizeof(*rp); - entries_size -= sizeof(*r); - - r->max_entries = entries_size / sizeof(r->entries[0]); + r->max_entries = root_num_entries(root_size);
/* Fill in first entry covering the root region. */ r->num_entries = 1; @@ -176,38 +195,14 @@ int imd_create_empty(struct imd *imd, size_t root_size, size_t entry_align) return 0; }
-int imd_limit_size(struct imd *imd, size_t max_size) -{ - struct imd_root *r; - ssize_t smax_size; - size_t root_size; - - r = imd_root(imd); - if (r == NULL) - return -1; - - root_size = imd->limit - (uintptr_t)r; - - if (max_size < root_size) - return -1; - - /* Take into account the root size. */ - smax_size = max_size - root_size; - smax_size = -smax_size; - - r->max_offset = smax_size; - - return 0; -} - -int imd_recover(struct imd *imd) +static int imdr_recover(struct imdr *imdr) { struct imd_root_pointer *rp; struct imd_root *r; uintptr_t low_limit; size_t i;
- rp = imd_root_pointer(imd); + rp = imdr_root_pointer(imdr);
if (!imd_root_pointer_valid(rp)) return -1; @@ -216,7 +211,7 @@ int imd_recover(struct imd *imd)
/* Confirm the root and root pointer are just under the limit. */ if (ALIGN_UP((uintptr_t)&r->entries[r->max_entries], LIMIT_ALIGN) != - imd->limit) + imdr->limit) return -1;
if (r->num_entries > r->max_entries) @@ -242,61 +237,76 @@ int imd_recover(struct imd *imd) start_addr = (uintptr_t)relative_pointer(r, e->start_offset); if (start_addr < low_limit) return -1; - if (start_addr >= imd->limit || - (start_addr + e->size) >= imd->limit) + if (start_addr >= imdr->limit || + (start_addr + e->size) >= imdr->limit) return -1; }
/* Set root pointer. */ - imd->r = r; + imdr->r = r;
return 0; }
-int imd_lockdown(struct imd *imd) +static const struct imd_entry *imdr_entry_find(const struct imdr *imdr, + uint32_t id) { struct imd_root *r; + struct imd_entry *e; + size_t i; + + r = imdr_root(imdr);
- r = imd_root(imd); if (r == NULL) - return -1; + return NULL;
- r->flags |= IMD_FLAG_LOCKED; + e = NULL; + /* Skip first entry covering the root. */ + for (i = 1; i < r->num_entries; i++) { + if (id != r->entries[i].id) + continue; + e = &r->entries[i]; + break; + }
- return 0; + return e; }
-int imd_region_used(struct imd *imd, void **base, size_t *size) +static int imdr_limit_size(struct imdr *imdr, size_t max_size) { struct imd_root *r; - struct imd_entry *e; - void *low_addr; - size_t sz_used; - size_t i; - - r = imd_root(imd); + ssize_t smax_size; + size_t root_size;
+ r = imdr_root(imdr); if (r == NULL) return -1;
- /* Use last entry to obtain lowest address. */ - e = root_last_entry(r); + root_size = imdr->limit - (uintptr_t)r;
- low_addr = relative_pointer(r, e->start_offset); + if (max_size < root_size) + return -1;
- /* - * This could be calculated differently, but it's easy to just - * loop through the entries accumulating their sizes. - */ - for (i = 0, sz_used = 0; i < r->num_entries; i++) - sz_used += r->entries[i].size; + /* Take into account the root size. */ + smax_size = max_size - root_size; + smax_size = -smax_size;
- *base = low_addr; - *size = sz_used; + r->max_offset = smax_size;
return 0; }
+static size_t imdr_entry_size(const struct imdr *imdr, + const struct imd_entry *e) +{ + return e->size; +} + +static void *imdr_entry_at(const struct imdr *imdr, const struct imd_entry *e) +{ + return relative_pointer(imdr_root(imdr), e->start_offset); +} + static struct imd_entry *imd_entry_add_to_root(struct imd_root *r, uint32_t id, size_t size) { @@ -307,20 +317,15 @@ static struct imd_entry *imd_entry_add_to_root(struct imd_root *r, uint32_t id, if (r->num_entries == r->max_entries) return NULL;
- last_entry = root_last_entry(r); - /* See if size overflows imd total size. */ - if (r->max_offset != 0) { - size_t remaining = last_entry->start_offset - r->max_offset; - - if (size > remaining) - return NULL; - } + if (size > imd_root_data_left(r)) + return NULL;
/* * Determine if offset field overflows. All offsets should be lower * than the previous one. */ + last_entry = root_last_entry(r); e_offset = last_entry->start_offset; e_offset -= (ssize_t)size; if (e_offset > last_entry->start_offset) @@ -334,12 +339,12 @@ static struct imd_entry *imd_entry_add_to_root(struct imd_root *r, uint32_t id, return entry; }
-const struct imd_entry *imd_entry_add(const struct imd *imd, uint32_t id, - size_t size) +static const struct imd_entry *imdr_entry_add(const struct imdr *imdr, + uint32_t id, size_t size) { struct imd_root *r;
- r = imd_root(imd); + r = imdr_root(imdr);
if (r == NULL) return NULL; @@ -347,25 +352,202 @@ const struct imd_entry *imd_entry_add(const struct imd *imd, uint32_t id, return imd_entry_add_to_root(r, id, size); }
-const struct imd_entry *imd_entry_find(const struct imd *imd, uint32_t id) +static bool imdr_has_entry(const struct imdr *imdr, const struct imd_entry *e) +{ + struct imd_root *r; + size_t idx; + + r = imdr_root(imdr); + if (r == NULL) + return false; + + /* Determine if the entry is within this root structure. */ + idx = e - &r->entries[0]; + if (idx >= r->num_entries) + return false; + + return true; +} + +static const struct imdr *imd_entry_to_imdr(const struct imd *imd, + const struct imd_entry *entry) +{ + if (imdr_has_entry(&imd->lg, entry)) + return &imd->lg; + + if (imdr_has_entry(&imd->sm, entry)) + return &imd->sm; + + return NULL; +} + +/* Initialize imd handle. */ +void imd_handle_init(struct imd *imd, void *upper_limit) +{ + imdr_init(&imd->lg, upper_limit); + imdr_init(&imd->sm, NULL); +} + +int imd_create_empty(struct imd *imd, size_t root_size, size_t entry_align) +{ + return imdr_create_empty(&imd->lg, root_size, entry_align); +} + +int imd_create_tiered_empty(struct imd *imd, + size_t lg_root_size, size_t lg_entry_align, + size_t sm_root_size, size_t sm_entry_align) +{ + size_t sm_region_size;; + const struct imd_entry *e; + struct imdr *imdr; + + imdr = &imd->lg; + + if (imdr_create_empty(imdr, lg_root_size, lg_entry_align) != 0) + return -1; + + /* Calculate the size of the small region to request. */ + sm_region_size = root_num_entries(sm_root_size) * sm_entry_align; + sm_region_size += sm_root_size; + sm_region_size = ALIGN_UP(sm_region_size, lg_entry_align); + + /* Add a new entry to the large region to cover the root and entries. */ + e = imdr_entry_add(imdr, SMALL_REGION_ID, sm_region_size); + + if (e == NULL) + goto fail; + + imd->sm.limit = (uintptr_t)imdr_entry_at(imdr, e); + imd->sm.limit += sm_region_size; + + if (imdr_create_empty(&imd->sm, sm_root_size, sm_entry_align) != 0 || + imdr_limit_size(&imd->sm, sm_region_size)) + goto fail; + + return 0; +fail: + imd_handle_init(imd, (void *)imdr->limit); + return -1; +} + +int imd_recover(struct imd *imd) +{ + const struct imd_entry *e; + uintptr_t small_upper_limit; + struct imdr *imdr; + + imdr = &imd->lg; + if (imdr_recover(imdr) != 0) + return -1; + + /* Determine if small region is region is present. */ + e = imdr_entry_find(imdr, SMALL_REGION_ID); + + if (e == NULL) + return 0; + + small_upper_limit = (uintptr_t)imdr_entry_at(imdr, e); + small_upper_limit += imdr_entry_size(imdr, e); + + imd->sm.limit = small_upper_limit; + + /* Tear down any changes on failure. */ + if (imdr_recover(&imd->sm) != 0) { + imd_handle_init(imd, (void *)imd->lg.limit); + return -1; + } + + return 0; +} + +int imd_limit_size(struct imd *imd, size_t max_size) +{ + return imdr_limit_size(&imd->lg, max_size); +} + +int imd_lockdown(struct imd *imd) +{ + struct imd_root *r; + + r = imdr_root(&imd->lg); + if (r == NULL) + return -1; + + r->flags |= IMD_FLAG_LOCKED; + + r = imdr_root(&imd->sm); + if (r != NULL) + r->flags |= IMD_FLAG_LOCKED; + + return 0; +} + +int imd_region_used(struct imd *imd, void **base, size_t *size) { struct imd_root *r; struct imd_entry *e; + void *low_addr; + size_t sz_used; size_t i;
- r = imd_root(imd); + r = imdr_root(&imd->lg);
if (r == NULL) - return NULL; + return -1;
- e = NULL; - /* Skip first entry covering the root. */ - for (i = 1; i < r->num_entries; i++) { - if (id != r->entries[i].id) - continue; - e = &r->entries[i]; - break; - } + /* Use last entry to obtain lowest address. */ + e = root_last_entry(r); + + low_addr = relative_pointer(r, e->start_offset); + + /* + * This could be calculated differently, but it's easy to just + * loop through the entries accumulating their sizes. + */ + for (i = 0, sz_used = 0; i < r->num_entries; i++) + sz_used += r->entries[i].size; + + *base = low_addr; + *size = sz_used; + + return 0; +} + +const struct imd_entry *imd_entry_add(const struct imd *imd, uint32_t id, + size_t size) +{ + struct imd_root *r; + const struct imdr *imdr; + const struct imd_entry *e = NULL; + + /* + * Determine if requested size is less than 1/4 of small data + * region is left. + */ + imdr = &imd->sm; + r = imdr_root(imdr); + + /* No small region. Use the large region. */ + if (r == NULL) + return imdr_entry_add(&imd->lg, id, size); + else if (size <= r->entry_align || size <= imd_root_data_left(r) / 4) + e = imdr_entry_add(imdr, id, size); + + /* Fall back on large region allocation. */ + if (e == NULL) + e = imdr_entry_add(&imd->lg, id, size); + + return e; +} + +const struct imd_entry *imd_entry_find(const struct imd *imd, uint32_t id) +{ + const struct imd_entry *e; + + e = imdr_entry_find(&imd->lg, id); + + if (e == NULL) + e = imdr_entry_find(&imd->sm, id);
return e; } @@ -385,26 +567,32 @@ const struct imd_entry *imd_entry_find_or_add(const struct imd *imd,
size_t imd_entry_size(const struct imd *imd, const struct imd_entry *entry) { - return entry->size; + return imdr_entry_size(NULL, entry); }
void *imd_entry_at(const struct imd *imd, const struct imd_entry *entry) { - struct imd_root *r; + const struct imdr *imdr;
- r = imd_root(imd); + imdr = imd_entry_to_imdr(imd, entry);
- if (r == NULL) + if (imdr == NULL) return NULL;
- return relative_pointer(r, entry->start_offset); + return imdr_entry_at(imdr, entry); }
int imd_entry_remove(const struct imd *imd, const struct imd_entry *entry) { struct imd_root *r; + const struct imdr *imdr; + + imdr = imd_entry_to_imdr(imd, entry);
- r = imd_root(imd); + if (imdr == NULL) + return - 1; + + r = imdr_root(imdr);
if (r == NULL) return -1; @@ -420,17 +608,17 @@ int imd_entry_remove(const struct imd *imd, const struct imd_entry *entry) return 0; }
-int imd_print_entries(const struct imd *imd, const struct imd_lookup *lookup, - size_t size) +static void imdr_print_entries(const struct imdr *imdr, + const struct imd_lookup *lookup, size_t size) { struct imd_root *r; size_t i; size_t j;
- r = imd_root(imd); + r = imdr_root(imdr);
if (r == NULL) - return -1; + return;
for (i = 0; i < r->num_entries; i++) { const char *name = NULL; @@ -449,9 +637,19 @@ int imd_print_entries(const struct imd *imd, const struct imd_lookup *lookup, else printk(BIOS_DEBUG, "%s", name); printk(BIOS_DEBUG, "%2zu. ", i); - printk(BIOS_DEBUG, "%p", imd_entry_at(imd, e)); - printk(BIOS_DEBUG, "%08zx\n", imd_entry_size(imd, e)); + printk(BIOS_DEBUG, "%p", imdr_entry_at(imdr, e)); + printk(BIOS_DEBUG, "%08zx\n", imdr_entry_size(imdr, e)); } +} + +int imd_print_entries(const struct imd *imd, const struct imd_lookup *lookup, + size_t size) +{ + if (imdr_root(&imd->lg) == NULL) + return -1; + + imdr_print_entries(&imd->lg, lookup, size); + imdr_print_entries(&imd->sm, lookup, size);
return 0; }