drivers/elog: Group event log state information
Group event log state information together to manage them better during different stages of coreboot. BUG=b:117884485 BRANCH=None TEST=Add an event log from romstage, boot to ChromeOS Change-Id: I62792c0f5063c89ad11b512f1777c7ab8a2c13e5 Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com> Reviewed-on: https://review.coreboot.org/29541 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Karthikeyan Ramasubramanian
Aaron Durbin
parent
25b387a50b
commit
07bc08c299
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@ -16,6 +16,7 @@
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#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
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#include <arch/acpi.h>
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#endif
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#include <arch/early_variables.h>
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#include <bootstate.h>
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#include <cbmem.h>
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#include <console/console.h>
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@ -42,33 +43,38 @@
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#endif
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#define NV_NEEDS_ERASE (~(size_t)0)
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/*
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* Static variables for ELOG state
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*/
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static u16 full_threshold;
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static u16 shrink_size;
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enum elog_init_state {
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ELOG_UNINITIALIZED = 0,
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ELOG_INITIALIZED,
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ELOG_BROKEN,
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};
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/*
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struct elog_state {
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u16 full_threshold;
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u16 shrink_size;
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/*
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* The non-volatile storage chases the mirrored copy. When nv_last_write
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* is less than the mirrored last write the non-volatile storage needs
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* to be updated.
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*/
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static size_t mirror_last_write;
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static size_t nv_last_write;
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size_t mirror_last_write;
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size_t nv_last_write;
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static struct region_device nv_dev;
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/* Device that mirrors the eventlog in memory. */
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static struct mem_region_device mirror_dev;
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struct region_device nv_dev;
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/* Device that mirrors the eventlog in memory. */
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struct mem_region_device mirror_dev;
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static enum {
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ELOG_UNINITIALIZED = 0,
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ELOG_INITIALIZED,
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ELOG_BROKEN,
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} elog_initialized = ELOG_UNINITIALIZED;
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enum elog_init_state elog_initialized;
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};
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static struct elog_state g_elog_state CAR_GLOBAL;
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static inline struct region_device *mirror_dev_get(void)
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{
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return &mirror_dev.rdev;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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return &es->mirror_dev.rdev;
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}
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static size_t elog_events_start(void)
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@ -79,7 +85,9 @@ static size_t elog_events_start(void)
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static size_t elog_events_total_space(void)
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{
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return region_device_sz(&nv_dev) - elog_events_start();
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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return region_device_sz(&es->nv_dev) - elog_events_start();
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}
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static struct event_header *elog_get_event_buffer(size_t offset, size_t size)
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@ -89,8 +97,10 @@ static struct event_header *elog_get_event_buffer(size_t offset, size_t size)
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static struct event_header *elog_get_next_event_buffer(size_t size)
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{
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elog_debug("ELOG: new event at offset 0x%zx\n", mirror_last_write);
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return elog_get_event_buffer(mirror_last_write, size);
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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elog_debug("ELOG: new event at offset 0x%zx\n", es->mirror_last_write);
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return elog_get_event_buffer(es->mirror_last_write, size);
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}
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static void elog_put_event_buffer(struct event_header *event)
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@ -100,53 +110,71 @@ static void elog_put_event_buffer(struct event_header *event)
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static size_t elog_mirror_reset_last_write(void)
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{
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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/* Return previous write value. */
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size_t prev = mirror_last_write;
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mirror_last_write = 0;
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size_t prev = es->mirror_last_write;
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es->mirror_last_write = 0;
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return prev;
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}
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static void elog_mirror_increment_last_write(size_t size)
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{
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mirror_last_write += size;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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es->mirror_last_write += size;
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}
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static void elog_nv_reset_last_write(void)
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{
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nv_last_write = 0;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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es->nv_last_write = 0;
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}
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static void elog_nv_increment_last_write(size_t size)
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{
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nv_last_write += size;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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es->nv_last_write += size;
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}
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static void elog_nv_needs_possible_erase(void)
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{
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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/* If last write is 0 it means it is already erased. */
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if (nv_last_write != 0)
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nv_last_write = NV_NEEDS_ERASE;
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if (es->nv_last_write != 0)
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es->nv_last_write = NV_NEEDS_ERASE;
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}
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static bool elog_should_shrink(void)
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{
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return mirror_last_write >= full_threshold;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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return es->mirror_last_write >= es->full_threshold;
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}
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static bool elog_nv_needs_erase(void)
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{
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return nv_last_write == NV_NEEDS_ERASE;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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return es->nv_last_write == NV_NEEDS_ERASE;
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}
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static bool elog_nv_needs_update(void)
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{
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return nv_last_write != mirror_last_write;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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return es->nv_last_write != es->mirror_last_write;
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}
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static size_t elog_nv_region_to_update(size_t *offset)
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{
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*offset = nv_last_write;
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return mirror_last_write - nv_last_write;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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*offset = es->nv_last_write;
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return es->mirror_last_write - es->nv_last_write;
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}
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/*
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@ -318,6 +346,7 @@ static void elog_nv_write(size_t offset, size_t size)
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{
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void *address;
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const struct region_device *rdev = mirror_dev_get();
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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if (!size)
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return;
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@ -331,7 +360,7 @@ static void elog_nv_write(size_t offset, size_t size)
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return;
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/* Write the data to flash */
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if (rdev_writeat(&nv_dev, address, offset, size) != size)
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if (rdev_writeat(&es->nv_dev, address, offset, size) != size)
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printk(BIOS_ERR, "ELOG: NV Write failed at 0x%zx, size 0x%zx\n",
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offset, size);
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@ -344,11 +373,12 @@ static void elog_nv_write(size_t offset, size_t size)
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*/
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static void elog_nv_erase(void)
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{
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size_t size = region_device_sz(&nv_dev);
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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size_t size = region_device_sz(&es->nv_dev);
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elog_debug("%s()\n", __func__);
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/* Erase the sectors in this region */
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if (rdev_eraseat(&nv_dev, 0, size) != size)
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if (rdev_eraseat(&es->nv_dev, 0, size) != size)
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printk(BIOS_ERR, "ELOG: erase failure.\n");
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}
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@ -406,11 +436,12 @@ static int elog_scan_flash(void)
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elog_debug("elog_scan_flash()\n");
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void *mirror_buffer;
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const struct region_device *rdev = mirror_dev_get();
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size_t size = region_device_sz(&nv_dev);
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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size_t size = region_device_sz(&es->nv_dev);
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/* Fill memory buffer by reading from SPI */
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mirror_buffer = rdev_mmap_full(rdev);
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if (rdev_readat(&nv_dev, mirror_buffer, 0, size) != size) {
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if (rdev_readat(&es->nv_dev, mirror_buffer, 0, size) != size) {
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rdev_munmap(rdev, mirror_buffer);
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printk(BIOS_ERR, "ELOG: NV read failure.\n");
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return -1;
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@ -574,8 +605,10 @@ static int elog_prepare_empty(void)
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static int elog_shrink(void)
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{
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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if (elog_should_shrink())
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return elog_shrink_by_size(shrink_size);
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return elog_shrink_by_size(es->shrink_size);
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return 0;
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}
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@ -584,16 +617,18 @@ static int elog_shrink(void)
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*/
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static inline u8 *elog_flash_offset_to_address(void)
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{
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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/* Only support memory-mapped devices. */
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if (!IS_ENABLED(CONFIG_BOOT_DEVICE_MEMORY_MAPPED))
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return NULL;
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if (!region_device_sz(&nv_dev))
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if (!region_device_sz(&es->nv_dev))
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return NULL;
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/* Get a view into the read-only boot device. */
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return rdev_mmap(boot_device_ro(), region_device_offset(&nv_dev),
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region_device_sz(&nv_dev));
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return rdev_mmap(boot_device_ro(), region_device_offset(&es->nv_dev),
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region_device_sz(&es->nv_dev));
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}
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/*
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@ -605,7 +640,8 @@ int elog_smbios_write_type15(unsigned long *current, int handle)
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struct smbios_type15 *t = (struct smbios_type15 *)*current;
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int len = sizeof(struct smbios_type15);
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uintptr_t log_address;
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size_t elog_size = region_device_sz(&nv_dev);
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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size_t elog_size = region_device_sz(&es->nv_dev);
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if (IS_ENABLED(CONFIG_ELOG_CBMEM)) {
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/* Save event log buffer into CBMEM for the OS to read */
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@ -659,7 +695,8 @@ static int elog_find_flash(void)
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{
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size_t total_size;
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size_t reserved_space = ELOG_MIN_AVAILABLE_ENTRIES * MAX_EVENT_SIZE;
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struct region_device *rdev = &nv_dev;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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struct region_device *rdev = &es->nv_dev;
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elog_debug("%s()\n", __func__);
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@ -682,10 +719,10 @@ static int elog_find_flash(void)
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total_size = MIN(4*KiB, region_device_sz(rdev));
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rdev_chain(rdev, rdev, 0, total_size);
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full_threshold = total_size - reserved_space;
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shrink_size = total_size * ELOG_SHRINK_PERCENTAGE / 100;
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es->full_threshold = total_size - reserved_space;
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es->shrink_size = total_size * ELOG_SHRINK_PERCENTAGE / 100;
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if (reserved_space > shrink_size) {
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if (reserved_space > es->shrink_size) {
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printk(BIOS_ERR, "ELOG: SHRINK_PERCENTAGE too small\n");
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return -1;
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}
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@ -698,6 +735,7 @@ static int elog_sync_to_nv(void)
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size_t offset;
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size_t size;
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bool erase_needed;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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/* Determine if any updates are required. */
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if (!elog_nv_needs_update())
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@ -729,7 +767,7 @@ static int elog_sync_to_nv(void)
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if (elog_scan_flash() < 0) {
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printk(BIOS_ERR, "ELOG: Sync back from NV storage failed.\n");
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elog_debug_dump_buffer("ELOG: Buffer from NV:\n");
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elog_initialized = ELOG_BROKEN;
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es->elog_initialized = ELOG_BROKEN;
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return -1;
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}
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@ -758,8 +796,9 @@ int elog_init(void)
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{
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void *mirror_buffer;
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size_t elog_size;
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struct elog_state *es = car_get_var_ptr(&g_elog_state);
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switch (elog_initialized) {
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switch (es->elog_initialized) {
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case ELOG_UNINITIALIZED:
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break;
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case ELOG_INITIALIZED:
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@ -767,7 +806,7 @@ int elog_init(void)
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case ELOG_BROKEN:
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return -1;
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}
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elog_initialized = ELOG_BROKEN;
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es->elog_initialized = ELOG_BROKEN;
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elog_debug("elog_init()\n");
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@ -775,19 +814,19 @@ int elog_init(void)
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if (elog_find_flash() < 0)
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return -1;
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elog_size = region_device_sz(&nv_dev);
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elog_size = region_device_sz(&es->nv_dev);
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mirror_buffer = malloc(elog_size);
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if (!mirror_buffer) {
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printk(BIOS_ERR, "ELOG: Unable to allocate backing store\n");
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return -1;
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}
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mem_region_device_rw_init(&mirror_dev, mirror_buffer, elog_size);
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mem_region_device_rw_init(&es->mirror_dev, mirror_buffer, elog_size);
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/*
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* Mark as initialized to allow elog_init() to be called and deemed
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* successful in the prepare/shrink path which adds events.
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*/
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elog_initialized = ELOG_INITIALIZED;
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es->elog_initialized = ELOG_INITIALIZED;
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/* Load the log from flash and prepare the flash if necessary. */
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if (elog_scan_flash() < 0 && elog_prepare_empty() < 0) {
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@ -796,8 +835,8 @@ int elog_init(void)
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}
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printk(BIOS_INFO, "ELOG: area is %zu bytes, full threshold %d,"
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" shrink size %d\n", region_device_sz(&nv_dev),
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full_threshold, shrink_size);
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" shrink size %d\n", region_device_sz(&es->nv_dev),
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es->full_threshold, es->shrink_size);
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if (elog_do_add_boot_count()) {
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elog_add_event_dword(ELOG_TYPE_BOOT, boot_count_read());
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