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https://github.com/AsahiLinux/m1n1
synced 2024-11-21 22:23:05 +00:00
kboot: Expose m1n1 console log in phram MTD reserved memory node
This registers a log buffer IODEV similar to the frame buffer IODEV. It is using a console IODEV to allow writing to the buffer until m1n1 jumps to the next stage. This allows also to increase the buffer size without increasing m1n1's size. The current CONSOLE_BUFFER_SIZE of 8k is not large enough to hold the entire log of executing m1n1 under the hypervisor on the M1 Ultra Mac Studio. Signed-off-by: Janne Grunau <j@jannau.net>
This commit is contained in:
parent
1d5556ccf3
commit
48837f4d47
3 changed files with 73 additions and 5 deletions
12
src/iodev.c
12
src/iodev.c
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@ -18,17 +18,19 @@
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extern struct iodev iodev_uart;
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extern struct iodev iodev_fb;
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extern struct iodev iodev_log;
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extern struct iodev iodev_usb_vuart;
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struct iodev *iodevs[IODEV_MAX] = {
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struct iodev *iodevs[IODEV_NUM] = {
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[IODEV_UART] = &iodev_uart,
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[IODEV_FB] = &iodev_fb,
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[IODEV_USB_VUART] = &iodev_usb_vuart,
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[IODEV_LOG] = &iodev_log,
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};
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char con_buf[CONSOLE_BUFFER_SIZE];
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size_t con_wp;
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size_t con_rp[IODEV_MAX];
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size_t con_rp[IODEV_NUM];
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void iodev_register_device(iodev_id_t id, struct iodev *dev)
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{
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@ -173,7 +175,7 @@ void iodev_console_write(const void *buf, size_t length)
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in_iodev++;
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dprintf(" iodev_console_write() wp=%d\n", con_wp);
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for (iodev_id_t id = 0; id < IODEV_MAX; id++) {
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for (iodev_id_t id = 0; id < IODEV_NUM; id++) {
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if (!iodevs[id])
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continue;
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@ -275,7 +277,7 @@ void iodev_console_kick(void)
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{
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iodev_console_write(NULL, 0);
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for (iodev_id_t id = 0; id < IODEV_MAX; id++) {
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for (iodev_id_t id = 0; id < IODEV_NUM; id++) {
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if (!iodevs[id])
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continue;
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if (!(iodevs[id]->usage & USAGE_CONSOLE))
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@ -287,7 +289,7 @@ void iodev_console_kick(void)
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void iodev_console_flush(void)
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{
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for (iodev_id_t id = 0; id < IODEV_MAX; id++) {
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for (iodev_id_t id = 0; id < IODEV_NUM; id++) {
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if (!iodevs[id])
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continue;
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if (!(iodevs[id]->usage & USAGE_CONSOLE))
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@ -14,6 +14,8 @@ typedef enum _iodev_id_t {
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IODEV_USB_VUART,
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IODEV_USB0,
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IODEV_MAX = IODEV_USB0 + USB_IODEV_COUNT,
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IODEV_LOG = IODEV_MAX, // hidden log buffer iodev
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IODEV_NUM,
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} iodev_id_t;
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typedef enum _iodev_usage_t {
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64
src/kboot.c
64
src/kboot.c
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@ -11,6 +11,7 @@
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#include "display.h"
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#include "exception.h"
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#include "firmware.h"
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#include "iodev.h"
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#include "isp.h"
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#include "malloc.h"
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#include "mcc.h"
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@ -2265,6 +2266,54 @@ int kboot_set_chosen(const char *name, const char *value)
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return i;
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}
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#define LOGBUF_SIZE SZ_16K
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struct {
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void *buffer;
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size_t wp;
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} logbuf;
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static bool log_console_iodev_can_write(void *opaque)
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{
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UNUSED(opaque);
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return !!logbuf.buffer;
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}
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static ssize_t log_console_iodev_write(void *opaque, const void *buf, size_t len)
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{
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UNUSED(opaque);
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if (!logbuf.buffer)
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return 0;
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ssize_t wrote = 0;
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size_t remain = LOGBUF_SIZE - logbuf.wp;
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while (remain < len) {
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memcpy(logbuf.buffer + logbuf.wp, buf, remain);
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logbuf.wp = 0;
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wrote += remain;
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buf += remain;
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len -= remain;
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remain = LOGBUF_SIZE;
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}
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memcpy(logbuf.buffer + logbuf.wp, buf, len);
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wrote += len;
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logbuf.wp = (logbuf.wp + len) % LOGBUF_SIZE;
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return wrote;
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}
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const struct iodev_ops iodev_log_ops = {
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.can_write = log_console_iodev_can_write,
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.write = log_console_iodev_write,
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};
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struct iodev iodev_log = {
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.ops = &iodev_log_ops,
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.usage = USAGE_CONSOLE,
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.lock = SPINLOCK_INIT,
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};
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static int dt_setup_mtd_phram(void)
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{
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char node_name[64];
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@ -2279,6 +2328,20 @@ static int dt_setup_mtd_phram(void)
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bail("FDT: failed to setup ADT MTD phram label\n");
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}
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// init memory backed iodev for console log
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logbuf.buffer = (void *)top_of_memory_alloc(LOGBUF_SIZE);
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if (!logbuf.buffer)
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bail("FDT: failed to allocate m1n1 log buffer\n");
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snprintf(node_name, sizeof(node_name), "flash@%lx", (u64)logbuf.buffer);
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node = dt_get_or_add_reserved_mem(node_name, "phram", false, (u64)logbuf.buffer, SZ_16K);
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if (node > 0) {
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int ret = fdt_setprop_string(dt, node, "label", "m1n1_stage2.log");
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if (ret)
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bail("FDT: failed to setup m1n1 log MTD phram label\n");
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}
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return 0;
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}
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@ -2307,6 +2370,7 @@ int kboot_prepare_dt(void *fdt)
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if (fdt_add_mem_rsv(dt, (u64)_base, ((u64)_end) - ((u64)_base)))
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bail("FDT: couldn't add reservation for m1n1\n");
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/* setup console log buffer early to cpature as much log as possible */
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dt_setup_mtd_phram();
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if (dt_set_chosen())
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