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mm: properly implement page locking

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Matheus
2026-07-08 01:37:12 -03:00
parent af30088c0d
commit 1512b2f3c6
14 changed files with 123 additions and 45 deletions
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kernel-src/io/block/ahci.c
+5 -5
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@@ -308,12 +308,12 @@ static int cmd_identify(ahci_t *ahci, int port, identify_t *results_phys) {
static void release_prdt(command_table_t *command_table, uint16_t prdtl) {
for (int i = 0; i < prdtl; ++i) {
void *address = (void *)((uint64_t)command_table->prdt[i].base_low | ((uint64_t)command_table->prdt[i].base_high << 32));
mm_release_page(address);
mm_unlock_and_release_page(address);
}
}
#define PRDTL_LIMIT ((PAGE_SIZE - sizeof(command_table_t)) / sizeof(prdt_t))
static int setup_prdt(iovec_iterator_t *iterator, command_table_t *command_table, uint16_t *prdtl, size_t *requested_size) {
static int setup_prdt(iovec_iterator_t *iterator, command_table_t *command_table, uint16_t *prdtl, size_t *requested_size, bool write) {
int err;
size_t block_done = 0;
size_t prdt_done = 0;
@@ -321,14 +321,14 @@ static int setup_prdt(iovec_iterator_t *iterator, command_table_t *command_table
while (block_done < *requested_size && prdt_done < PRDTL_LIMIT) {
void *page;
size_t page_offset, page_remaining;
err = iovec_iterator_next_page(iterator, &page_offset, &page_remaining, &page);
err = iovec_iterator_next_page(iterator, &page_offset, &page_remaining, &page, !write);
if (err)
goto cleanup;
__assert(page);
// not block aligned
if (page_remaining % 512) {
mm_release_page(page);
mm_unlock_and_release_page(page);
err = EINVAL;
goto cleanup;
}
@@ -386,7 +386,7 @@ static int rw(port_data_t *port_data, iovec_iterator_t *iterator, uintmax_t lba,
while (done != count) {
size_t do_count = count - done;
uint16_t prdtl_tmp;
error = setup_prdt(iterator, command_table, &prdtl_tmp, &do_count);
error = setup_prdt(iterator, command_table, &prdtl_tmp, &do_count, write);
if (error)
break;