From: David van Moolenbroek Date: Tue, 12 Feb 2013 13:53:09 +0000 (+0000) Subject: ahci: rewrite timeout initialization code X-Git-Tag: v3.2.1~9 X-Git-Url: http://zhaoyanbai.com/repos/FAQ?a=commitdiff_plain;h=23b12e29a2120a8b7a18e8703ce2ab9d68660eda;p=minix.git ahci: rewrite timeout initialization code - the "ahci_sig_timeout" variable now denotes the entire checking period, and the delay between checks has been hardcoded; what was previously "ahci_sig_checks" is now computed from those two; - timeout values are no longer used for both millisecond and clock tick values, and better typed; - the computation of timeouts is no longer off by half a second. --- diff --git a/drivers/ahci/ahci.c b/drivers/ahci/ahci.c index bbb47efdd..4af5b1210 100644 --- a/drivers/ahci/ahci.c +++ b/drivers/ahci/ahci.c @@ -181,13 +181,27 @@ static int ahci_instance; /* driver instance number */ static int ahci_verbose; /* verbosity level (0..4) */ -/* Timeout values. These can be overridden with environment variables. */ -static long ahci_spinup_timeout = SPINUP_TIMEOUT; -static long ahci_sig_timeout = SIG_TIMEOUT; -static long ahci_sig_checks = NR_SIG_CHECKS; -static long ahci_command_timeout = COMMAND_TIMEOUT; -static long ahci_transfer_timeout = TRANSFER_TIMEOUT; -static long ahci_flush_timeout = FLUSH_TIMEOUT; +/* Timeout-related values. */ +static clock_t ahci_spinup_timeout; +static clock_t ahci_sig_timeout; +static clock_t ahci_sig_delay; +static unsigned int ahci_sig_checks; +static clock_t ahci_command_timeout; +static clock_t ahci_transfer_timeout; +static clock_t ahci_flush_timeout; + +/* Timeout environment variable names and default values. */ +static struct { + char *name; /* environment variable name */ + u32_t default_ms; /* default in milliseconds */ + clock_t *ptr; /* clock ticks value pointer */ +} ahci_timevar[] = { + { "ahci_init_timeout", SPINUP_TIMEOUT, &ahci_spinup_timeout }, + { "ahci_sig_timeout", SIG_TIMEOUT, &ahci_sig_timeout }, + { "ahci_cmd_timeout", COMMAND_TIMEOUT, &ahci_command_timeout }, + { "ahci_io_timeout", TRANSFER_TIMEOUT, &ahci_transfer_timeout }, + { "ahci_flush_timeout", FLUSH_TIMEOUT, &ahci_flush_timeout } +}; static int ahci_map[MAX_DRIVES]; /* device-to-port mapping */ @@ -202,6 +216,9 @@ static int ahci_exiting = FALSE; /* exit after last close? */ printf s; \ } while (0) +/* Convert milliseconds to clock ticks. Round up. */ +#define millis_to_hz(ms) (((ms) * sys_hz() + 999) / 1000) + static void port_set_cmd(struct port_state *ps, int cmd, cmd_fis_t *fis, u8_t packet[ATAPI_PACKET_SIZE], prd_t *prdt, int nr_prds, int write); static void port_issue(struct port_state *ps, int cmd, clock_t timeout); @@ -1330,7 +1347,7 @@ static void port_sig_check(struct port_state *ps) /* Try for a while before giving up. It may take seconds. */ if (ps->left > 0) { ps->left--; - set_timer(&ps->cmd_info[0].timer, ahci_sig_timeout, + set_timer(&ps->cmd_info[0].timer, ahci_sig_delay, port_timeout, BUILD_ARG(ps - port_state, 0)); return; } @@ -2142,23 +2159,6 @@ static void ahci_intr(unsigned int UNUSED(mask)) panic("unable to enable IRQ: %d", r); } -/*===========================================================================* - * ahci_get_var * - *===========================================================================*/ -static void ahci_get_var(char *name, long *v, int timeout) -{ - /* Retrieve an environment variable, and optionall adjust it to the - * scale that we are using internally. - */ - - /* The value is supposed to be initialized to a default already. */ - (void) env_parse(name, "d", 0, v, 1, LONG_MAX); - - /* If this is a timeout, convert from milliseconds to ticks. */ - if (timeout) - *v = (*v + 500) * sys_hz() / 1000; -} - /*===========================================================================* * ahci_get_params * *===========================================================================*/ @@ -2168,6 +2168,7 @@ static void ahci_get_params(void) * device-to-port mapping, which has to be parsed later. */ long v; + int i; /* Find out which driver instance we are. */ v = 0; @@ -2180,12 +2181,18 @@ static void ahci_get_params(void) ahci_verbose = (int) v; /* Initialize timeout-related values. */ - ahci_get_var("ahci_init_timeout", &ahci_spinup_timeout, TRUE); - ahci_get_var("ahci_sig_timeout", &ahci_sig_timeout, TRUE); - ahci_get_var("ahci_sig_checks", &ahci_sig_checks, FALSE); - ahci_get_var("ahci_cmd_timeout", &ahci_command_timeout, TRUE); - ahci_get_var("ahci_io_timeout", &ahci_transfer_timeout, TRUE); - ahci_get_var("ahci_flush_timeout", &ahci_flush_timeout, TRUE); + for (i = 0; i < sizeof(ahci_timevar) / sizeof(ahci_timevar[0]); i++) { + v = ahci_timevar[i].default_ms; + + (void) env_parse(ahci_timevar[i].name, "d", 0, &v, 1, + LONG_MAX); + + *ahci_timevar[i].ptr = millis_to_hz(v); + } + + ahci_sig_delay = millis_to_hz(SIG_DELAY); + ahci_sig_checks = + (ahci_sig_timeout + ahci_sig_delay - 1) / ahci_sig_delay; } /*===========================================================================* diff --git a/drivers/ahci/ahci.h b/drivers/ahci/ahci.h index 48b5f5318..3a58e423b 100644 --- a/drivers/ahci/ahci.h +++ b/drivers/ahci/ahci.h @@ -8,8 +8,7 @@ /* Time values that can be set with options. */ #define SPINUP_TIMEOUT 5000 /* initial spin-up time (ms) */ -#define SIG_TIMEOUT 250 /* time between signature checks (ms) */ -#define NR_SIG_CHECKS 60 /* maximum number of times to check */ +#define SIG_TIMEOUT 15000 /* time to wait for signature (ms) */ #define COMMAND_TIMEOUT 10000 /* time to wait for non-I/O cmd (ms) */ #define TRANSFER_TIMEOUT 30000 /* time to wait for I/O cmd (ms) */ #define FLUSH_TIMEOUT 60000 /* time to wait for flush cmd (ms) */ @@ -19,6 +18,9 @@ #define RESET_DELAY 1000 /* maximum HBA reset time (ms) */ #define PORTREG_DELAY 500 /* maximum port register update (ms) */ +/* Other hardcoded time values. */ +#define SIG_DELAY 250 /* time between signature checks (ms) */ + /* Generic FIS layout. */ #define ATA_FIS_TYPE 0 /* FIS Type */ #define ATA_FIS_TYPE_H2D 0x27 /* Register - Host to Device */