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nvme: Shut down the controller cleanly

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Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2022-03-02 21:08:23 +09:00
parent bb7c7dd0ce
commit 616fedaf62
1 changed files with 33 additions and 8 deletions
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41
src/nvme.c
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@ -10,14 +10,23 @@
#include "string.h"
#include "utils.h"
#define NVME_TIMEOUT 1000000
#define NVME_QUEUE_SIZE 64
#define NVME_TIMEOUT 1000000
#define NVME_SHUTDOWN_TIMEOUT (5 * NVME_TIMEOUT)
#define NVME_QUEUE_SIZE 64
#define NVME_CC 0x14
#define NVME_CC_EN BIT(0)
#define NVME_CC 0x14
#define NVME_CC_SHN GENMASK(15, 14)
#define NVME_CC_SHN_NONE 0
#define NVME_CC_SHN_NORMAL 1
#define NVME_CC_SHN_ABRUPT 2
#define NVME_CC_EN BIT(0)
#define NVME_CSTS 0x1c
#define NVME_CSTS_RDY BIT(0)
#define NVME_CSTS 0x1c
#define NVME_CSTS_SHST GENMASK(3, 2)
#define NVME_CSTS_SHST_NORMAL 0
#define NVME_CSTS_SHST_BUSY 1
#define NVME_CSTS_SHST_DONE 2
#define NVME_CSTS_RDY BIT(0)
#define NVME_AQA 0x24
#define NVME_ASQ 0x28
@ -178,13 +187,25 @@ static bool nvme_ctrl_enable(void)
{
u64 timeout = timeout_calculate(NVME_TIMEOUT);
set32(nvme_base + NVME_CC, NVME_CC_EN);
mask32(nvme_base + NVME_CC, NVME_CC_SHN, NVME_CC_EN);
while (!(read32(nvme_base + NVME_CSTS) & NVME_CSTS_RDY) && !timeout_expired(timeout))
nvme_poll_syslog();
return read32(nvme_base + NVME_CSTS) & NVME_CSTS_RDY;
}
static bool nvme_ctrl_shutdown(void)
{
u64 timeout = timeout_calculate(NVME_SHUTDOWN_TIMEOUT);
mask32(nvme_base + NVME_CC, NVME_CC_SHN, FIELD_PREP(NVME_CC_SHN, NVME_CC_SHN_NORMAL));
while (FIELD_GET(NVME_CSTS_SHST, read32(nvme_base + NVME_CSTS)) != NVME_CSTS_SHST_DONE &&
!timeout_expired(timeout))
nvme_poll_syslog();
return FIELD_GET(NVME_CSTS_SHST, read32(nvme_base + NVME_CSTS)) == NVME_CSTS_SHST_DONE;
}
static bool nvme_exec_command(struct nvme_queue *q, struct nvme_command *cmd, u64 *result)
{
bool found = false;
@ -415,7 +436,11 @@ void nvme_shutdown(void)
if (!nvme_exec_command(&adminq, &cmd, NULL))
printf("nvme: delete cq command failed\n");
nvme_ctrl_disable();
if (!nvme_ctrl_shutdown())
printf("nvme: timeout while waiting for controller shutdown\n");
if (!nvme_ctrl_disable())
printf("nvme: timeout while waiting for CSTS.RDY to clear\n");
rtkit_sleep(nvme_rtkit);
pmgr_reset("ANS2");
rtkit_free(nvme_rtkit);