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minix/drivers/ahci/ahci.c

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AHCI driver
2010-08-05 18:37:58 +02:00
/* Advanced Host Controller Interface (AHCI) driver, by D.C. van Moolenbroek */
/*
* This driver is based on the following specifications:
* - Serial ATA Advanced Host Controller Interface (AHCI) 1.3
* - Serial ATA Revision 2.6
* - AT Attachment with Packet Interface 7 (ATA/ATAPI-7)
* - ATAPI Removable Rewritable Media Devices 1.3 (SFF-8070)
*
* The driver supports device hot-plug, active device status tracking,
* nonremovable ATA and removable ATAPI devices, custom logical sector sizes,
* and sector-unaligned reads.
*
* It does not implement transparent failure recovery, power management, native
* command queuing, port multipliers, or any form of parallelism with respect
* to incoming requests.
*/
/*
* An AHCI controller exposes a number of ports (up to 32), each of which may
* or may not have one device attached (port multipliers are not supported).
* Each port is maintained independently, although due to the synchronous
* nature of libdriver, an ongoing request for one port will block subsequent
* requests for all other ports as well. It should be relatively easy to remove
* this limitation in the future.
*
* The following figure depicts the possible transitions between port states.
* The NO_PORT state is not included; no transitions can be made from or to it.
*
* +----------+ +----------+
* | SPIN_UP | ------+ +-----> | BAD_DEV | ------------------+
* +----------+ | | +----------+ |
* | | | ^ |
* v v | | |
* +----------+ +----------+ +----------+ +----------+ |
* | NO_DEV | --> | WAIT_SIG | --> | WAIT_ID | --> | GOOD_DEV | |
* +----------+ +----------+ +----------+ +----------+ |
* ^ | | | |
* +----------------+----------------+----------------+--------+
*
* At driver startup, all physically present ports are put in SPIN_UP state.
* This state differs from NO_DEV in that DEV_OPEN calls will be deferred
* until either the spin-up timer expires, or a device has been identified on
* that port. This prevents early DEV_OPEN calls from failing erroneously at
* startup time if the device has not yet been able to announce its presence.
*
* If a device is detected, either at startup time or after hot-plug, its
* signature is checked and it is identified, after which it may be determined
* to be a usable ("good") device, which means that the device is considered to
* be in a working state. If these steps fail, the device is marked as unusable
* ("bad"). At any point in time, the device may be disconnected; the port is
* then put back into NO_DEV state.
*
* A device in working state (GOOD_DEV) may or may not have a medium. All ATA
* devices are assumed to be fixed; all ATAPI devices are assumed to have
* removable media. To prevent erroneous access to switched devices and media,
* the driver makes devices inaccessible until they are fully closed (the open
* count is zero) when a device (hot-plug) or medium change is detected.
* For hot-plug changes, access is prevented by setting the BARRIER flag until
* the device is fully closed and then reopened. For medium changes, access is
* prevented by not acknowledging the medium change until the device is fully
* closed and reopened. Removable media are not locked in the drive while
* opened, because the driver author is uncomfortable with that concept.
*
* The following table lists for each state, whether the port is started
* (PxCMD.ST is set), whether a timer is running, what the PxIE mask is to be
* set to, and what DEV_OPEN calls on this port should return.
*
* State Started Timer PxIE DEV_OPEN
* --------- --------- --------- --------- ---------
* NO_PORT no no (none) ENXIO
* SPIN_UP no yes PRCE (wait)
* NO_DEV no no PRCE ENXIO
* WAIT_SIG yes yes PRCE (wait)
* WAIT_ID yes yes (all) (wait)
* BAD_DEV no no PRCE ENXIO
* GOOD_DEV yes when busy (all) OK
*
* In order to continue deferred DEV_OPEN calls, the BUSY flag must be unset
* when changing from SPIN_UP to any state but WAIT_SIG, and when changing from
* WAIT_SIG to any state but WAIT_ID, and when changing from WAIT_ID to any
* other state.
*
* Normally, the BUSY flag is used to indicate whether a command is in
* progress. Again, due to the synchronous nature of libdriver, there is no
* support for native command queuing yet. To allow this limitation to be
* removed in the future, there is already some support in the code for
* specifying a command number, even though it will currently always be zero.
*/
/*
* The maximum byte size of a single transfer (MAX_TRANSFER) is currently set
* to 4MB. This limit has been chosen for a number of reasons:
* - The size that can be specified in a Physical Region Descriptor (PRD) is
* limited to 4MB for AHCI. Limiting the total transfer size to at most this
* size implies that no I/O vector element needs to be split up across PRDs.
* This means that the maximum number of needed PRDs can be predetermined.
* - The limit is below what can be transferred in a single ATA request, namely
* 64k sectors (i.e., at least 32MB). This means that transfer requests need
* never be split up into smaller chunks, reducing implementation complexity.
* - A single, static timeout can be used for transfers. Very large transfers
* can legitimately take up to several minutes -- well beyond the appropriate
* timeout range for small transfers. The limit obviates the need for a
* timeout scheme that takes into account the transfer size.
* - Similarly, the transfer limit reduces the opportunity for buggy/malicious
* clients to keep the driver busy for a long time with a single request.
* - The limit is high enough for all practical purposes. The transfer setup
* overhead is already relatively negligible at this size, and even larger
* requests will not help maximize throughput. As NR_IOREQS is currently set
* to 64, the limit still allows file systems to perform I/O requests with
* vectors completely filled with 64KB-blocks.
*/
#include <minix/drivers.h>
#include <minix/driver.h>
#include <minix/drvlib.h>
#include <machine/pci.h>
#include <sys/ioc_disk.h>
#include <sys/mman.h>
#include <assert.h>
#include "ahci.h"
/* Host Bus Adapter (HBA) state. */
PRIVATE struct {
u32_t *base; /* base address of memory-mapped registers */
size_t size; /* size of memory-mapped register area */
int nr_ports; /* addressable number of ports (1..NR_PORTS) */
int nr_cmds; /* maximum number of commands per port */
int irq; /* IRQ number */
int hook_id; /* IRQ hook ID */
} hba_state;
/* Port state. */
PRIVATE struct port_state {
int state; /* port state */
unsigned int flags; /* port flags */
u32_t *reg; /* memory-mapped port registers */
u8_t *mem_base; /* primary memory buffer virtual address */
phys_bytes mem_phys; /* primary memory buffer physical address */
vir_bytes mem_size; /* primary memory buffer size */
/* the FIS, CL, CT[0] and TMP buffers are all in the primary buffer */
u32_t *fis_base; /* FIS receive buffer virtual address */
phys_bytes fis_phys; /* FIS receive buffer physical address */
u32_t *cl_base; /* command list buffer virtual address */
phys_bytes cl_phys; /* command list buffer physical address */
u8_t *ct_base[NR_CMDS]; /* command table virtual address */
phys_bytes ct_phys[NR_CMDS]; /* command table physical address */
u8_t *tmp_base; /* temporary storage buffer virtual address */
phys_bytes tmp_phys; /* temporary storage buffer physical address */
u8_t *pad_base; /* sector padding buffer virtual address */
phys_bytes pad_phys; /* sector padding buffer physical address */
vir_bytes pad_size; /* sector padding buffer size */
u64_t lba_count; /* number of valid Logical Block Addresses */
u32_t sector_size; /* medium sector size in bytes */
int open_count; /* number of times this port is opened */
int device; /* associated device number, or NO_DEVICE */
struct device part[DEV_PER_DRIVE]; /* partition bases and sizes */
struct device subpart[SUB_PER_DRIVE]; /* same for subpartitions */
timer_t timer; /* port-specific timeout timer */
int left; /* number of tries left before giving up */
/* (only used for signature probing) */
} port_state[NR_PORTS];
PRIVATE int ahci_instance; /* driver instance number */
PRIVATE int ahci_verbose; /* verbosity level (0..4) */
/* Timeout values. These can be overridden with environment variables. */
PRIVATE long ahci_spinup_timeout = SPINUP_TIMEOUT;
PRIVATE long ahci_sig_timeout = SIG_TIMEOUT;
PRIVATE long ahci_sig_checks = NR_SIG_CHECKS;
PRIVATE long ahci_command_timeout = COMMAND_TIMEOUT;
PRIVATE long ahci_transfer_timeout = TRANSFER_TIMEOUT;
PRIVATE int ahci_map[MAX_DRIVES]; /* device-to-port mapping */
PRIVATE int ahci_exiting = FALSE; /* exit after last close? */
PRIVATE struct port_state *current_port; /* currently selected port */
PRIVATE struct device *current_dev; /* currently selected device */
#define dprintf(v,s) do { \
if (ahci_verbose >= (v)) \
printf s; \
} while (0)
PRIVATE 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);
PRIVATE void port_issue(struct port_state *ps, int cmd, clock_t timeout);
PRIVATE int port_exec(struct port_state *ps, int cmd, clock_t timeout);
PRIVATE void port_timeout(struct timer *tp);
PRIVATE void port_disconnect(struct port_state *ps);
PRIVATE char *ahci_name(void);
PRIVATE char *ahci_portname(struct port_state *ps);
PRIVATE int ahci_open(struct driver *UNUSED(dp), message *m);
PRIVATE int ahci_close(struct driver *UNUSED(dp), message *m);
PRIVATE struct device *ahci_prepare(int minor);
PRIVATE int ahci_transfer(endpoint_t endpt, int opcode, u64_t position,
iovec_t *iovec, unsigned int nr_req);
PRIVATE void ahci_geometry(struct partition *part);
PRIVATE void ahci_alarm(struct driver *UNUSED(dp), message *m);
PRIVATE int ahci_other(struct driver *UNUSED(dp), message *m);
PRIVATE int ahci_intr(struct driver *UNUSED(dr), message *m);
/* AHCI driver table. */
PRIVATE struct driver ahci_dtab = {
ahci_name,
ahci_open,
ahci_close,
do_diocntl,
ahci_prepare,
ahci_transfer,
nop_cleanup,
ahci_geometry,
ahci_alarm,
nop_cancel,
nop_select,
ahci_other,
ahci_intr
};
/*===========================================================================*
* atapi_exec *
*===========================================================================*/
PRIVATE int atapi_exec(struct port_state *ps, int cmd,
u8_t packet[ATAPI_PACKET_SIZE], size_t size, int write)
{
/* Execute an ATAPI command. Return OK or error.
*/
cmd_fis_t fis;
prd_t prd;
int nr_prds = 0;
assert(size <= AHCI_TMP_SIZE);
/* Fill in the command table with a FIS, a packet, and if a data
* transfer is requested, also a PRD.
*/
memset(&fis, 0, sizeof(fis));
fis.cf_cmd = ATA_CMD_PACKET;
if (size > 0) {
fis.cf_feat = ATA_FEAT_PACKET_DMA;
if (!write && (ps->flags & FLAG_USE_DMADIR))
fis.cf_feat |= ATA_FEAT_PACKET_DMADIR;
prd.prd_phys = ps->tmp_phys;
prd.prd_size = size;
nr_prds++;
}
/* Start the command, and wait for it to complete or fail. */
port_set_cmd(ps, cmd, &fis, packet, &prd, nr_prds, write);
return port_exec(ps, cmd, ahci_command_timeout);
}
/*===========================================================================*
* atapi_test_unit *
*===========================================================================*/
PRIVATE int atapi_test_unit(struct port_state *ps, int cmd)
{
/* Test whether the ATAPI device and medium are ready.
*/
u8_t packet[ATAPI_PACKET_SIZE];
memset(packet, 0, sizeof(packet));
packet[0] = ATAPI_CMD_TEST_UNIT;
return atapi_exec(ps, cmd, packet, 0, FALSE);
}
/*===========================================================================*
* atapi_request_sense *
*===========================================================================*/
PRIVATE int atapi_request_sense(struct port_state *ps, int cmd, int *sense)
{
/* Request error (sense) information from an ATAPI device, and return
* the sense key. The additional sense codes are not used at this time.
*/
u8_t packet[ATAPI_PACKET_SIZE];
int r;
memset(packet, 0, sizeof(packet));
packet[0] = ATAPI_CMD_REQUEST_SENSE;
packet[4] = ATAPI_REQUEST_SENSE_LEN;
r = atapi_exec(ps, cmd, packet, ATAPI_REQUEST_SENSE_LEN, FALSE);
if (r != OK)
return r;
dprintf(V_REQ, ("%s: ATAPI SENSE: sense %x ASC %x ASCQ %x\n",
ahci_portname(ps), ps->tmp_base[2] & 0xF, ps->tmp_base[12],
ps->tmp_base[13]));
*sense = ps->tmp_base[2] & 0xF;
return OK;
}
/*===========================================================================*
* atapi_load_eject *
*===========================================================================*/
PRIVATE int atapi_load_eject(struct port_state *ps, int cmd, int load)
{
/* Load or eject a medium in an ATAPI device.
*/
u8_t packet[ATAPI_PACKET_SIZE];
memset(packet, 0, sizeof(packet));
packet[0] = ATAPI_CMD_START_STOP;
packet[4] = (load) ? ATAPI_START_STOP_LOAD : ATAPI_START_STOP_EJECT;
return atapi_exec(ps, cmd, packet, 0, FALSE);
}
/*===========================================================================*
* atapi_read_capacity *
*===========================================================================*/
PRIVATE int atapi_read_capacity(struct port_state *ps, int cmd)
{
/* Retrieve the LBA count and sector size of an ATAPI medium.
*/
u8_t packet[ATAPI_PACKET_SIZE], *buf;
int r;
memset(packet, 0, sizeof(packet));
packet[0] = ATAPI_CMD_READ_CAPACITY;
r = atapi_exec(ps, cmd, packet, ATAPI_READ_CAPACITY_LEN, FALSE);
if (r != OK)
return r;
/* Store the number of LBA blocks and sector size. */
buf = ps->tmp_base;
ps->lba_count = add64u(cvu64((buf[0] << 24) | (buf[1] << 16) |
(buf[2] << 8) | buf[3]), 1);
ps->sector_size =
(buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7];
if (ps->sector_size == 0 || (ps->sector_size & 1)) {
dprintf(V_ERR, ("%s: invalid medium sector size %lu\n",
ahci_portname(ps), ps->sector_size));
return EINVAL;
}
dprintf(V_INFO,
("%s: medium detected (%lu byte sectors, %lu MB size)\n",
ahci_portname(ps), ps->sector_size,
div64u(mul64(ps->lba_count, cvu64(ps->sector_size)),
1024*1024)));
return OK;
}
/*===========================================================================*
* atapi_check_medium *
*===========================================================================*/
PRIVATE int atapi_check_medium(struct port_state *ps, int cmd)
{
/* Check whether a medium is present in a removable-media ATAPI device.
* If a new medium is detected, get its total and sector size. Return
* OK only if a usable medium is present, and an error otherwise.
*/
int sense;
/* Perform a readiness check. */
if (atapi_test_unit(ps, cmd) != OK) {
ps->flags &= ~FLAG_HAS_MEDIUM;
/* If the check failed due to a unit attention condition, retry
* reading the medium capacity. Otherwise, assume that there is
* no medium available.
*/
if (atapi_request_sense(ps, cmd, &sense) != OK ||
sense != ATAPI_SENSE_UNIT_ATT)
return ENXIO;
}
/* If a medium is newly detected, try reading its capacity now. */
if (!(ps->flags & FLAG_HAS_MEDIUM)) {
if (atapi_read_capacity(ps, cmd) != OK)
return EIO;
ps->flags |= FLAG_HAS_MEDIUM;
}
return OK;
}
/*===========================================================================*
* atapi_identify *
*===========================================================================*/
PRIVATE void atapi_identify(struct port_state *ps)
{
/* Identify an ATAPI device.
*/
cmd_fis_t fis;
prd_t prd;
/* Set up a command, and a single PRD for the result. */
memset(&fis, 0, sizeof(fis));
fis.cf_cmd = ATA_CMD_IDENTIFY_PACKET;
prd.prd_phys = ps->tmp_phys;
prd.prd_size = AHCI_ID_SIZE;
/* Start the command, but do not wait for the result. */
port_set_cmd(ps, 0, &fis, NULL /*packet*/, &prd, 1, FALSE /*write*/);
port_issue(ps, 0, ahci_command_timeout);
}
/*===========================================================================*
* atapi_id_check *
*===========================================================================*/
PRIVATE int atapi_id_check(struct port_state *ps, u16_t *buf)
{
/* Determine whether we support this ATAPI device based on the
* identification data it returned, and store some of its properties.
*/
/* The device must be an ATAPI device; it must have removable media;
* it must support DMA without DMADIR, or DMADIR for DMA.
*/
if ((buf[ATA_ID_GCAP] & (ATA_ID_GCAP_ATAPI_MASK |
ATA_ID_GCAP_REMOVABLE | ATA_ID_GCAP_INCOMPLETE)) !=
(ATA_ID_GCAP_ATAPI | ATA_ID_GCAP_REMOVABLE) ||
((buf[ATA_ID_CAP] & ATA_ID_CAP_DMA) != ATA_ID_CAP_DMA &&
(buf[ATA_ID_DMADIR] & (ATA_ID_DMADIR_DMADIR |
ATA_ID_DMADIR_DMA)) != (ATA_ID_DMADIR_DMADIR |
ATA_ID_DMADIR_DMA))) {
dprintf(V_ERR, ("%s: unsupported ATAPI device\n",
ahci_portname(ps)));
dprintf(V_DEV, ("%s: GCAP %04x CAP %04x DMADIR %04x\n",
ahci_portname(ps), buf[ATA_ID_GCAP], buf[ATA_ID_CAP],
buf[ATA_ID_DMADIR]));
return FALSE;
}
/* Remember whether to use the DMADIR flag when appropriate. */
if (buf[ATA_ID_DMADIR] & ATA_ID_DMADIR_DMADIR)
ps->flags |= FLAG_USE_DMADIR;
/* ATAPI CD-ROM devices are considered read-only. */
if (((buf[ATA_ID_GCAP] & ATA_ID_GCAP_TYPE_MASK) >>
ATA_ID_GCAP_TYPE_SHIFT) == ATAPI_TYPE_CDROM)
ps->flags |= FLAG_READONLY;
return TRUE;
}
/*===========================================================================*
* atapi_transfer *
*===========================================================================*/
PRIVATE int atapi_transfer(struct port_state *ps, int cmd, u64_t start_lba,
unsigned int count, int write, prd_t *prdt, int nr_prds)
{
/* Perform data transfer from or to an ATAPI device.
*/
cmd_fis_t fis;
u8_t packet[ATAPI_PACKET_SIZE];
/* Fill in a Register Host to Device FIS. */
memset(&fis, 0, sizeof(fis));
fis.cf_cmd = ATA_CMD_PACKET;
fis.cf_feat = ATA_FEAT_PACKET_DMA;
if (!write && (ps->flags & FLAG_USE_DMADIR))
fis.cf_feat |= ATA_FEAT_PACKET_DMADIR;
/* Fill in a packet. */
memset(packet, 0, sizeof(packet));
packet[0] = write ? ATAPI_CMD_WRITE : ATAPI_CMD_READ;
packet[2] = (ex64lo(start_lba) >> 24) & 0xFF;
packet[3] = (ex64lo(start_lba) >> 16) & 0xFF;
packet[4] = (ex64lo(start_lba) >> 8) & 0xFF;
packet[5] = ex64lo(start_lba) & 0xFF;
packet[6] = (count >> 24) & 0xFF;
packet[7] = (count >> 16) & 0xFF;
packet[8] = (count >> 8) & 0xFF;
packet[9] = count & 0xFF;
/* Start the command, and wait for it to complete or fail. */
port_set_cmd(ps, cmd, &fis, packet, prdt, nr_prds, write);
return port_exec(ps, cmd, ahci_transfer_timeout);
}
/*===========================================================================*
* ata_identify *
*===========================================================================*/
PRIVATE void ata_identify(struct port_state *ps)
{
/* Identify an ATA device.
*/
cmd_fis_t fis;
prd_t prd;
/* Set up a command, and a single PRD for the result. */
memset(&fis, 0, sizeof(fis));
fis.cf_cmd = ATA_CMD_IDENTIFY;
prd.prd_phys = ps->tmp_phys;
prd.prd_size = AHCI_ID_SIZE;
/* Start the command, but do not wait for the result. */
port_set_cmd(ps, 0, &fis, NULL /*packet*/, &prd, 1, FALSE /*write*/);
port_issue(ps, 0, ahci_command_timeout);
}
/*===========================================================================*
* ata_id_check *
*===========================================================================*/
PRIVATE int ata_id_check(struct port_state *ps, u16_t *buf)
{
/* Determine whether we support this ATA device based on the
* identification data it returned, and store some of its properties.
*/
/* This must be an ATA device; it must not have removable media;
* it must support LBA and DMA; it must support 48-bit addressing.
*/
if ((buf[ATA_ID_GCAP] & (ATA_ID_GCAP_ATA_MASK | ATA_ID_GCAP_REMOVABLE |
ATA_ID_GCAP_INCOMPLETE)) != ATA_ID_GCAP_ATA ||
(buf[ATA_ID_CAP] & (ATA_ID_CAP_LBA | ATA_ID_CAP_DMA)) !=
(ATA_ID_CAP_LBA | ATA_ID_CAP_DMA) ||
(buf[ATA_ID_SUP1] &
(ATA_ID_SUP1_VALID_MASK | ATA_ID_SUP1_LBA48)) !=
(ATA_ID_SUP1_VALID | ATA_ID_SUP1_LBA48)) {
dprintf(V_ERR, ("%s: unsupported ATA device\n",
ahci_portname(ps)));
dprintf(V_DEV, ("%s: GCAP %04x CAP %04x SUP1 %04x\n",
ahci_portname(ps), buf[ATA_ID_GCAP], buf[ATA_ID_CAP],
buf[ATA_ID_SUP1]));
return FALSE;
}
/* Get number of LBA blocks, and sector size. */
ps->lba_count = make64((buf[ATA_ID_LBA1] << 16) | buf[ATA_ID_LBA0],
(buf[ATA_ID_LBA3] << 16) | buf[ATA_ID_LBA2]);
/* For now, we only support long logical sectors. Long physical sector
* support may be added later. Note that the given value is in words.
*/
if ((buf[ATA_ID_PLSS] & (ATA_ID_PLSS_VALID_MASK | ATA_ID_PLSS_LLS)) ==
(ATA_ID_PLSS_VALID | ATA_ID_PLSS_LLS))
ps->sector_size =
((buf[ATA_ID_LSS1] << 16) | buf[ATA_ID_LSS0]) << 1;
else
ps->sector_size = ATA_SECTOR_SIZE;
if (ps->sector_size < ATA_SECTOR_SIZE) {
dprintf(V_ERR, ("%s: invalid sector size %lu\n",
ahci_portname(ps), ps->sector_size));
return FALSE;
}
ps->flags |= FLAG_HAS_MEDIUM;
return TRUE;
}
/*===========================================================================*
* ata_transfer *
*===========================================================================*/
PRIVATE int ata_transfer(struct port_state *ps, int cmd, u64_t start_lba,
unsigned int count, int write, prd_t *prdt, int nr_prds)
{
/* Perform data transfer from or to an ATA device.
*/
cmd_fis_t fis;
assert(count <= ATA_MAX_SECTORS);
/* Special case for sector counts: 65536 is specified as 0. */
if (count == ATA_MAX_SECTORS)
count = 0;
/* Fill in a transfer command. */
memset(&fis, 0, sizeof(fis));
fis.cf_cmd = write ? ATA_CMD_WRITE_DMA_EXT : ATA_CMD_READ_DMA_EXT;
fis.cf_lba = ex64lo(start_lba) & 0x00FFFFFFL;
fis.cf_dev = ATA_DEV_LBA;
fis.cf_lba_exp = ex64lo(rshift64(start_lba, 24)) & 0x00FFFFFFL;
fis.cf_sec = count & 0xFF;
fis.cf_sec_exp = (count >> 8) & 0xFF;
/* Start the command, and wait for it to complete or fail. */
port_set_cmd(ps, cmd, &fis, NULL /*packet*/, prdt, nr_prds, write);
return port_exec(ps, cmd, ahci_transfer_timeout);
}
/*===========================================================================*
* ct_set_fis *
*===========================================================================*/
PRIVATE vir_bytes ct_set_fis(u8_t *ct, cmd_fis_t *fis)
{
/* Fill in the Frame Information Structure part of a command table,
* and return the resulting FIS size (in bytes). We only support the
* command Register - Host to Device FIS type.
*/
memset(ct, 0, ATA_H2D_SIZE);
ct[ATA_FIS_TYPE] = ATA_FIS_TYPE_H2D;
ct[ATA_H2D_FLAGS] = ATA_H2D_FLAGS_C;
ct[ATA_H2D_CMD] = fis->cf_cmd;
ct[ATA_H2D_FEAT] = fis->cf_feat;
ct[ATA_H2D_LBA_LOW] = fis->cf_lba & 0xFF;
ct[ATA_H2D_LBA_MID] = (fis->cf_lba >> 8) & 0xFF;
ct[ATA_H2D_LBA_HIGH] = (fis->cf_lba >> 16) & 0xFF;
ct[ATA_H2D_DEV] = fis->cf_dev;
ct[ATA_H2D_LBA_LOW_EXP] = fis->cf_lba_exp & 0xFF;
ct[ATA_H2D_LBA_MID_EXP] = (fis->cf_lba_exp >> 8) & 0xFF;
ct[ATA_H2D_LBA_HIGH_EXP] = (fis->cf_lba_exp >> 16) & 0xFF;
ct[ATA_H2D_FEAT_EXP] = fis->cf_feat_exp;
ct[ATA_H2D_SEC] = fis->cf_sec;
ct[ATA_H2D_SEC_EXP] = fis->cf_sec_exp;
ct[ATA_H2D_CTL] = fis->cf_ctl;
return ATA_H2D_SIZE;
}
/*===========================================================================*
* ct_set_packet *
*===========================================================================*/
PRIVATE void ct_set_packet(u8_t *ct, u8_t packet[ATAPI_PACKET_SIZE])
{
/* Fill in the packet part of a command table.
*/
memcpy(&ct[AHCI_CT_PACKET_OFF], packet, ATAPI_PACKET_SIZE);
}
/*===========================================================================*
* ct_set_prdt *
*===========================================================================*/
PRIVATE void ct_set_prdt(u8_t *ct, prd_t *prdt, int nr_prds)
{
/* Fill in the PRDT part of a command table.
*/
u32_t *p;
int i;
p = (u32_t *) &ct[AHCI_CT_PRDT_OFF];
for (i = 0; i < nr_prds; i++, prdt++) {
*p++ = prdt->prd_phys;
*p++ = 0L;
*p++ = 0L;
*p++ = prdt->prd_size - 1;
}
}
/*===========================================================================*
* port_set_cmd *
*===========================================================================*/
PRIVATE 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)
{
/* Prepare the given command for execution, by constructing a command
* table and setting up a command list entry pointing to the table.
*/
u8_t *ct;
u32_t *cl;
vir_bytes size;
/* Construct a command table, consisting of a command FIS, optionally
* a packet, and optionally a number of PRDs (making up the actual PRD
* table).
*/
ct = ps->ct_base[cmd];
assert(ct != NULL);
assert(nr_prds <= NR_PRDS);
size = ct_set_fis(ct, fis);
if (packet != NULL)
ct_set_packet(ct, packet);
ct_set_prdt(ct, prdt, nr_prds);
/* Construct a command list entry, pointing to the command's table.
* Current assumptions: callers always provide a Register - Host to
* Device type FIS, and all commands are prefetchable.
*/
cl = &ps->cl_base[cmd * AHCI_CL_ENTRY_DWORDS];
memset(cl, 0, AHCI_CL_ENTRY_SIZE);
cl[0] = (nr_prds << AHCI_CL_PRDTL_SHIFT) |
((nr_prds > 0 || packet != NULL) ? AHCI_CL_PREFETCHABLE : 0) |
(write ? AHCI_CL_WRITE : 0) |
((packet != NULL) ? AHCI_CL_ATAPI : 0) |
((size / sizeof(u32_t)) << AHCI_CL_CFL_SHIFT);
cl[2] = ps->ct_phys[cmd];
}
/*===========================================================================*
* port_get_padbuf *
*===========================================================================*/
PRIVATE int port_get_padbuf(struct port_state *ps, size_t size)
{
/* Make available a temporary buffer for use by this port. Enlarge the
* previous buffer if applicable and necessary, potentially changing
* its physical address.
*/
if (ps->pad_base != NULL && ps->pad_size >= size)
return OK;
if (ps->pad_base != NULL)
free_contig(ps->pad_base, ps->pad_size);
ps->pad_size = size;
ps->pad_base = alloc_contig(ps->pad_size, 0, &ps->pad_phys);
if (ps->pad_base == NULL) {
dprintf(V_ERR, ("%s: unable to allocate a padding buffer of "
"size %lu\n", ahci_portname(ps),
(unsigned long) size));
return ENOMEM;
}
dprintf(V_INFO, ("%s: allocated padding buffer of size %lu\n",
ahci_portname(ps), (unsigned long) size));
return OK;
}
/*===========================================================================*
* sum_iovec *
*===========================================================================*/
PRIVATE int sum_iovec(endpoint_t endpt, iovec_s_t *iovec, int nr_req,
vir_bytes *total)
{
/* Retrieve the total size of the given I/O vector. Check for alignment
* requirements along the way. Return OK (and the total request size)
* or an error.
*/
vir_bytes size, bytes;
int i;
bytes = 0;
for (i = 0; i < nr_req; i++) {
size = iovec[i].iov_size;
if (size == 0 || (size & 1) || size > LONG_MAX) {
dprintf(V_ERR, ("%s: bad size %lu in iovec from %d\n",
ahci_name(), size, endpt));
return EINVAL;
}
bytes += size;
if (bytes > LONG_MAX) {
dprintf(V_ERR, ("%s: iovec size overflow from %d\n",
ahci_name(), endpt));
return EINVAL;
}
}
*total = bytes;
return OK;
}
/*===========================================================================*
* setup_prdt *
*===========================================================================*/
PRIVATE int setup_prdt(struct port_state *ps, endpoint_t endpt,
iovec_s_t *iovec, int nr_req, vir_bytes size, vir_bytes lead,
prd_t *prdt)
{
/* Convert (the first part of) an I/O vector to a Physical Region
* Descriptor Table describing array that can later be used to set the
* command's real PRDT. The resulting table as a whole should be
* sector-aligned; leading and trailing local buffers may have to be
* used for padding as appropriate. Return the number of PRD entries,
* or a negative error code.
*/
vir_bytes bytes, trail;
phys_bytes phys;
int i, r, nr_prds = 0;
if (lead > 0) {
/* Allocate a buffer for the data we don't want. */
if ((r = port_get_padbuf(ps, ps->sector_size)) != OK)
return r;
prdt[nr_prds].prd_phys = ps->pad_phys;
prdt[nr_prds].prd_size = lead;
nr_prds++;
}
/* The sum of lead, size, trail has to be sector-aligned. */
trail = (ps->sector_size - (lead + size)) % ps->sector_size;
for (i = 0; i < nr_req && size > 0; i++) {
bytes = MIN(iovec[i].iov_size, size);
/* Get the physical address of the given buffer. */
if (endpt == SELF)
r = sys_umap(endpt, VM_D,
(vir_bytes) iovec[i].iov_grant, bytes, &phys);
else
r = sys_umap(endpt, VM_GRANT, iovec[i].iov_grant,
bytes, &phys);
if (r != OK) {
dprintf(V_ERR, ("%s: unable to map area from %d "
"(%d)\n", ahci_name(), endpt, r));
return EINVAL;
}
if (phys & 1) {
dprintf(V_ERR, ("%s: bad physical address from %d\n",
ahci_name(), endpt));
return EINVAL;
}
assert(nr_prds < NR_PRDS);
prdt[nr_prds].prd_phys = phys;
prdt[nr_prds].prd_size = bytes;
nr_prds++;
size -= bytes;
}
if (trail > 0) {
assert(nr_prds < NR_PRDS);
prdt[nr_prds].prd_phys = ps->pad_phys + lead;
prdt[nr_prds].prd_size = trail;
nr_prds++;
}
return nr_prds;
}
/*===========================================================================*
* port_transfer *
*===========================================================================*/
PRIVATE int port_transfer(struct port_state *ps, int cmd, u64_t pos, u64_t eof,
endpoint_t endpt, iovec_s_t *iovec, int nr_req, int write)
{
/* Perform an I/O transfer on a port.
*/
static prd_t prdt[NR_PRDS];
vir_bytes size, lead, chunk;
unsigned int count, nr_prds;
u64_t start_lba;
int i, r;
/* Get the total request size from the I/O vector. */
if ((r = sum_iovec(endpt, iovec, nr_req, &size)) != OK)
return r;
dprintf(V_REQ, ("%s: %s for %lu bytes at pos %08lx%08lx\n",
ahci_portname(ps), write ? "write" : "read", size,
ex64hi(pos), ex64lo(pos)));
assert(ps->state == STATE_GOOD_DEV);
assert(ps->flags & FLAG_HAS_MEDIUM);
assert(ps->sector_size > 0);
/* Limit the maximum size of a single transfer.
* See the comments at the top of this file for details.
*/
if (size > MAX_TRANSFER)
size = MAX_TRANSFER;
/* If necessary, reduce the request size so that the request does not
* extend beyond the end of the partition. The caller already
* guarantees that the starting position lies within the partition.
*/
if (cmp64(add64ul(pos, size), eof) >= 0)
size = (vir_bytes) diff64(eof, pos);
start_lba = div64(pos, cvu64(ps->sector_size));
lead = rem64u(pos, ps->sector_size);
count = (lead + size + ps->sector_size - 1) / ps->sector_size;
/* Position must be word-aligned for read requests, and sector-aligned
* for write requests. We do not support read-modify-write for writes.
*/
if ((lead & 1) || (write && lead != 0)) {
dprintf(V_ERR, ("%s: unaligned position from %d\n",
ahci_portname(ps), endpt));
return EIO;
}
/* Write requests must be sector-aligned. Word alignment of the size is
* already guaranteed by sum_iovec().
*/
if (write && (size % ps->sector_size) != 0) {
dprintf(V_ERR, ("%s: unaligned size %lu from %d\n",
ahci_portname(ps), size, endpt));
return EIO;
}
/* Create a vector of physical addresses and sizes for the transfer. */
nr_prds = r = setup_prdt(ps, endpt, iovec, nr_req, size, lead, prdt);
if (r < 0) return r;
/* Perform the actual transfer. */
if (ps->flags & FLAG_ATAPI)
r = atapi_transfer(ps, cmd, start_lba, count, write, prdt,
nr_prds);
else
r = ata_transfer(ps, cmd, start_lba, count, write, prdt,
nr_prds);
if (r < 0) return r;
/* The entire operation succeeded; update the original vector. */
for (i = 0; i < nr_req && size > 0; i++) {
chunk = MIN(iovec[i].iov_size, size);
iovec[i].iov_size -= chunk;
size -= chunk;
}
return OK;
}
/*===========================================================================*
* port_start *
*===========================================================================*/
PRIVATE void port_start(struct port_state *ps)
{
/* Start the given port, allowing for the execution of commands and the
* transfer of data on that port.
*/
u32_t cmd;
/* Enable FIS receive. */
cmd = ps->reg[AHCI_PORT_CMD];
ps->reg[AHCI_PORT_CMD] = cmd | AHCI_PORT_CMD_FRE;
/* Reset status registers. */
ps->reg[AHCI_PORT_SERR] = ~0L;
ps->reg[AHCI_PORT_IS] = ~0L;
/* Start the port. */
cmd = ps->reg[AHCI_PORT_CMD];
ps->reg[AHCI_PORT_CMD] = cmd | AHCI_PORT_CMD_ST;
dprintf(V_INFO, ("%s: started\n", ahci_portname(ps)));
}
/*===========================================================================*
* port_restart *
*===========================================================================*/
PRIVATE void port_restart(struct port_state *ps)
{
/* Restart a port after a fatal error has occurred.
*/
u32_t cmd;
/* Stop the port. */
cmd = ps->reg[AHCI_PORT_CMD];
ps->reg[AHCI_PORT_CMD] = cmd & ~AHCI_PORT_CMD_ST;
SPIN_UNTIL(!(ps->reg[AHCI_PORT_CMD] & AHCI_PORT_CMD_CR),
PORTREG_DELAY);
/* Reset status registers. */
ps->reg[AHCI_PORT_SERR] = ~0L;
ps->reg[AHCI_PORT_IS] = ~0L;
/* If the BSY and/or DRQ flags are set, reset the port. */
if (ps->reg[AHCI_PORT_TFD] &
(AHCI_PORT_TFD_STS_BSY | AHCI_PORT_TFD_STS_DRQ)) {
dprintf(V_ERR, ("%s: port reset\n", ahci_portname(ps)));
/* Trigger a port reset. */
ps->reg[AHCI_PORT_SCTL] = AHCI_PORT_SCTL_DET_INIT;
micro_delay(SPINUP_DELAY * 1000);
ps->reg[AHCI_PORT_SCTL] = AHCI_PORT_SCTL_DET_NONE;
/* To keep this driver simple, we do not transparently recover
* ongoing requests. Instead, we mark the failing device as
* disconnected, and assume that if the reset succeeds, the
* device (or, perhaps, eventually, another device) will come
* back up. Any current and future requests to this port will
* be failed until the port is fully closed and reopened.
*/
port_disconnect(ps);
return;
}
/* Start the port. */
cmd = ps->reg[AHCI_PORT_CMD];
ps->reg[AHCI_PORT_CMD] = cmd | AHCI_PORT_CMD_ST;
dprintf(V_INFO, ("%s: restarted\n", ahci_portname(ps)));
}
/*===========================================================================*
* port_stop *
*===========================================================================*/
PRIVATE void port_stop(struct port_state *ps)
{
/* Stop the given port, if not already stopped.
*/
u32_t cmd;
/* Disable interrupts. */
ps->reg[AHCI_PORT_IE] = AHCI_PORT_IE_NONE;
/* Stop the port. */
cmd = ps->reg[AHCI_PORT_CMD];
if (cmd & (AHCI_PORT_CMD_CR | AHCI_PORT_CMD_ST)) {
cmd &= ~(AHCI_PORT_CMD_CR | AHCI_PORT_CMD_ST);
ps->reg[AHCI_PORT_CMD] = cmd;
SPIN_UNTIL(!(ps->reg[AHCI_PORT_CMD] & AHCI_PORT_CMD_CR),
PORTREG_DELAY);
dprintf(V_INFO, ("%s: stopped\n", ahci_portname(ps)));
cmd = ps->reg[AHCI_PORT_CMD];
}
if (cmd & (AHCI_PORT_CMD_FR | AHCI_PORT_CMD_FRE)) {
cmd &= ~(AHCI_PORT_CMD_FR | AHCI_PORT_CMD_FRE);
ps->reg[AHCI_PORT_CMD] = cmd;
SPIN_UNTIL(!(ps->reg[AHCI_PORT_CMD] & AHCI_PORT_CMD_FR),
PORTREG_DELAY);
}
/* Reset status registers. */
ps->reg[AHCI_PORT_SERR] = ~0L;
ps->reg[AHCI_PORT_IS] = ~0L;
}
/*===========================================================================*
* port_sig_check *
*===========================================================================*/
PRIVATE void port_sig_check(struct port_state *ps)
{
/* Check whether the device's signature has become available yet, and
* if so, start identifying the device.
*/
u32_t tfd, sig;
tfd = ps->reg[AHCI_PORT_TFD];
/* Wait for the BSY flag to be (set and then) cleared first. Note that
* clearing it only happens when PxCMD.FRE is set, which is why we
* start the port before starting the signature wait cycle.
*/
if ((tfd & AHCI_PORT_TFD_STS_BSY) || tfd == AHCI_PORT_TFD_STS_INIT) {
/* Try for a while before giving up. It may take seconds. */
if (ps->left > 0) {
ps->left--;
set_timer(&ps->timer, ahci_sig_timeout, port_timeout,
ps - port_state);
return;
}
/* If no device is actually attached, disable the port. This
* value is also the initial value of the register, before the
* BSY flag gets set, so only check this condition on timeout.
*/
if (tfd == AHCI_PORT_TFD_STS_INIT) {
dprintf(V_DEV, ("%s: no device at this port\n",
ahci_portname(ps)));
port_stop(ps);
ps->state = STATE_BAD_DEV;
ps->flags &= ~FLAG_BUSY;
return;
}
port_restart(ps);
dprintf(V_ERR, ("%s: timeout waiting for signature\n",
ahci_portname(ps)));
}
/* Check the port's signature. We only support the normal ATA and ATAPI
* signatures. We ignore devices reporting anything else.
*/
sig = ps->reg[AHCI_PORT_SIG];
if (sig != ATA_SIG_ATA && sig != ATA_SIG_ATAPI) {
dprintf(V_ERR, ("%s: unsupported signature (%08lx)\n",
ahci_portname(ps), sig));
port_stop(ps);
ps->state = STATE_BAD_DEV;
ps->flags &= ~FLAG_BUSY;
return;
}
/* Clear all state flags except the busy flag, which may be relevant if
* a DEV_OPEN call is waiting for the device to become ready, and the
* barrier flag, which prevents access to the device until it is
* completely closed and (re)opened.
*/
ps->flags &= FLAG_BUSY | FLAG_BARRIER;
if (sig == ATA_SIG_ATAPI)
ps->flags |= FLAG_ATAPI;
/* Attempt to identify the device. Do this using continuation, because
* we may already be called from port_wait() here, and could end up
* confusing the timer expiration procedure.
*/
ps->state = STATE_WAIT_ID;
ps->reg[AHCI_PORT_IE] = AHCI_PORT_IE_MASK;
if (ps->flags & FLAG_ATAPI)
atapi_identify(ps);
else
ata_identify(ps);
}
/*===========================================================================*
* print_string *
*===========================================================================*/
PRIVATE void print_string(u16_t *buf, int start, int end)
{
/* Print a string that is stored as little-endian words and padded with
* trailing spaces.
*/
int i, last = 0;
while (end >= start && buf[end] == 0x2020) end--;
if (end >= start && (buf[end] & 0xFF) == 0x20) end--, last++;
for (i = start; i <= end; i++)
printf("%c%c", buf[i] >> 8, buf[i] & 0xFF);
if (last)
printf("%c", buf[i] >> 8);
}
/*===========================================================================*
* port_id_check *
*===========================================================================*/
PRIVATE void port_id_check(struct port_state *ps)
{
/* The device identification command has either completed or timed out.
* Decide whether this device is usable or not, and store some of its
* properties.
*/
u16_t *buf;
int r;
cancel_timer(&ps->timer);
assert(ps->state == STATE_WAIT_ID);
assert(!(ps->flags & FLAG_BUSY)); /* unset by callers */
r = !(ps->flags & FLAG_FAILURE);
if (r != TRUE)
dprintf(V_ERR,
("%s: unable to identify\n", ahci_portname(ps)));
/* If the identify command itself succeeded, check the results and
* store some properties.
*/
if (r == TRUE) {
buf = (u16_t *) ps->tmp_base;
if (ps->flags & FLAG_ATAPI)
r = atapi_id_check(ps, buf);
else
r = ata_id_check(ps, buf);
}
/* If the device has not been identified successfully, mark it as an
* unusable device.
*/
if (r != TRUE) {
port_stop(ps);
ps->state = STATE_BAD_DEV;
ps->reg[AHCI_PORT_IE] = AHCI_PORT_IE_PRCE;
return;
}
/* The device has been identified successfully, and hence usable. */
ps->state = STATE_GOOD_DEV;
/* Print some information about the device. */
if (ahci_verbose >= V_INFO) {
printf("%s: ATA%s, ", ahci_portname(ps),
(ps->flags & FLAG_ATAPI) ? "PI" : "");
print_string(buf, 27, 46);
if (ahci_verbose >= V_DEV) {
printf(" (");
print_string(buf, 10, 19);
printf(", ");
print_string(buf, 23, 26);
printf(")");
}
if (ps->flags & FLAG_HAS_MEDIUM)
printf(", %lu byte sectors, %lu MB size",
ps->sector_size, div64u(mul64(ps->lba_count,
cvu64(ps->sector_size)), 1024*1024));
printf("\n");
}
}
/*===========================================================================*
* port_connect *
*===========================================================================*/
PRIVATE void port_connect(struct port_state *ps)
{
/* A device has been found to be attached to this port. Start the port,
* and do timed polling for its signature to become available.
*/
dprintf(V_INFO, ("%s: device connected\n", ahci_portname(ps)));
if (ps->state == STATE_SPIN_UP)
cancel_timer(&ps->timer);
port_start(ps);
ps->state = STATE_WAIT_SIG;
ps->left = ahci_sig_checks;
ps->flags |= FLAG_BUSY;
ps->reg[AHCI_PORT_IE] = AHCI_PORT_IE_PRCE;
/* Do the first check immediately; who knows, we may get lucky. */
port_sig_check(ps);
}
/*===========================================================================*
* port_disconnect *
*===========================================================================*/
PRIVATE void port_disconnect(struct port_state *ps)
{
/* The device has detached from this port. Stop the port if necessary,
* and abort any ongoing command.
*/
dprintf(V_INFO, ("%s: device disconnected\n", ahci_portname(ps)));
if (ps->flags & FLAG_BUSY)
cancel_timer(&ps->timer);
if (ps->state != STATE_BAD_DEV)
port_stop(ps);
ps->state = STATE_NO_DEV;
ps->reg[AHCI_PORT_IE] = AHCI_PORT_IE_PRCE;
/* Fail any ongoing request. */
if (ps->flags & FLAG_BUSY) {
ps->flags &= ~FLAG_BUSY;
ps->flags |= FLAG_FAILURE;
}
/* Block any further access until the device is completely closed and
* reopened. This prevents arbitrary I/O to a newly plugged-in device
* without upper layers noticing.
*/
ps->flags |= FLAG_BARRIER;
}
/*===========================================================================*
* port_intr *
*===========================================================================*/
PRIVATE void port_intr(struct port_state *ps)
{
/* Process an interrupt on this port.
*/
u32_t smask, emask;
int connected;
if (ps->state == STATE_NO_PORT) {
dprintf(V_ERR, ("%s: interrupt for invalid port!\n",
ahci_portname(ps)));
return;
}
smask = ps->reg[AHCI_PORT_IS];
emask = smask & ps->reg[AHCI_PORT_IE];
/* Clear the interrupt flags that we saw were set. */
ps->reg[AHCI_PORT_IS] = smask;
dprintf(V_REQ, ("%s: interrupt (%08lx)\n", ahci_portname(ps), smask));
if (emask & AHCI_PORT_IS_PRCS) {
/* Clear the N diagnostics bit to clear this interrupt. */
ps->reg[AHCI_PORT_SERR] = AHCI_PORT_SERR_DIAG_N;
connected =
(ps->reg[AHCI_PORT_SSTS] & AHCI_PORT_SSTS_DET_MASK) ==
AHCI_PORT_SSTS_DET_PHY;
switch (ps->state) {
case STATE_BAD_DEV:
case STATE_GOOD_DEV:
case STATE_WAIT_SIG:
case STATE_WAIT_ID:
port_disconnect(ps);
/* fall-through */
default:
if (!connected)
break;
port_connect(ps);
}
}
else if ((ps->flags & FLAG_BUSY) && (smask & AHCI_PORT_IS_MASK) &&
(!(ps->reg[AHCI_PORT_TFD] & AHCI_PORT_TFD_STS_BSY) ||
(ps->reg[AHCI_PORT_TFD] & AHCI_PORT_TFD_STS_ERR))) {
assert(!(ps->flags & FLAG_FAILURE));
/* Command completed or failed. */
ps->flags &= ~FLAG_BUSY;
if (ps->reg[AHCI_PORT_TFD] & AHCI_PORT_TFD_STS_ERR)
ps->flags |= FLAG_FAILURE;
/* Some error cases require a port restart. */
if (smask & AHCI_PORT_IS_RESTART)
port_restart(ps);
if (ps->state == STATE_WAIT_ID)
port_id_check(ps);
}
}
/*===========================================================================*
* port_timeout *
*===========================================================================*/
PRIVATE void port_timeout(struct timer *tp)
{
/* A timeout has occurred on this port. Figure out what the timeout is
* for, and take appropriate action.
*/
struct port_state *ps;
int port;
port = tmr_arg(tp)->ta_int;
assert(port >= 0 && port < hba_state.nr_ports);
ps = &port_state[port];
/* If detection of a device after startup timed out, give up on initial
* detection and only look for hot plug events from now on.
*/
if (ps->state == STATE_SPIN_UP) {
/* There is one exception: for braindead controllers that don't
* generate the right interrupts (cough, VirtualBox), we do an
* explicit check to see if a device is connected after all.
* Later hot-(un)plug events will not be detected in this case.
*/
if ((ps->reg[AHCI_PORT_SSTS] & AHCI_PORT_SSTS_DET_MASK) ==
AHCI_PORT_SSTS_DET_PHY) {
dprintf(V_INFO, ("%s: no device connection event\n",
ahci_portname(ps)));
port_connect(ps);
}
else {
dprintf(V_INFO, ("%s: spin-up timeout\n",
ahci_portname(ps)));
/* If the busy flag is set, a DEV_OPEN request is
* waiting for the detection to finish; clear the busy
* flag to return an error to the caller.
*/
ps->state = STATE_NO_DEV;
ps->flags &= ~FLAG_BUSY;
}
return;
}
/* If a device has been connected and we are waiting for its signature
* to become available, check now.
*/
if (ps->state == STATE_WAIT_SIG) {
port_sig_check(ps);
return;
}
/* Any other timeout can only occur while busy. */
if (!(ps->flags & FLAG_BUSY))
return;
ps->flags &= ~FLAG_BUSY;
ps->flags |= FLAG_FAILURE;
dprintf(V_ERR, ("%s: timeout\n", ahci_portname(ps)));
/* Restart the port, so that hopefully at least the next command has a
* chance to succeed again.
*/
port_restart(ps);
/* If an I/O operation failed, the caller will know because the busy
* flag has been unset. If an identify operation failed, finish up the
* operation now.
*/
if (ps->state == STATE_WAIT_ID)
port_id_check(ps);
}
/*===========================================================================*
* port_wait *
*===========================================================================*/
PRIVATE void port_wait(struct port_state *ps)
{
/* Receive and process incoming messages until the given port is no
* longer busy (due to command completion or timeout). Queue any new
* requests for later processing.
*/
message m;
int r, ipc_status;
while (ps->flags & FLAG_BUSY) {
if ((r = driver_receive(ANY, &m, &ipc_status)) != OK)
panic("driver_receive failed: %d", r);
if (is_ipc_notify(ipc_status)) {
switch (m.m_source) {
case HARDWARE:
ahci_intr(NULL, &m);
break;
case CLOCK:
ahci_alarm(NULL, &m);
break;
default:
driver_mq_queue(&m, ipc_status);
}
}
else {
driver_mq_queue(&m, ipc_status);
}
}
}
/*===========================================================================*
* port_issue *
*===========================================================================*/
PRIVATE void port_issue(struct port_state *ps, int cmd, clock_t timeout)
{
/* Issue a command to the port, mark the port as busy, and set a timer
* to trigger a timeout if the command takes too long to complete.
*/
/* Reset status registers. */
ps->reg[AHCI_PORT_SERR] = ~0L;
ps->reg[AHCI_PORT_IS] = ~0L;
/* Tell the controller that a new command is ready. */
ps->reg[AHCI_PORT_CI] = (1L << cmd);
/* Mark the port as executing a command. */
ps->flags |= FLAG_BUSY;
ps->flags &= ~FLAG_FAILURE;
/* Set a timer in case the command does not complete at all. */
set_timer(&ps->timer, timeout, port_timeout, ps - port_state);
}
/*===========================================================================*
* port_exec *
*===========================================================================*/
PRIVATE int port_exec(struct port_state *ps, int cmd, clock_t timeout)
{
/* Execute a command on a port, wait for the command to complete or for
* a timeout, and return whether the command succeeded or not.
*/
port_issue(ps, cmd, timeout);
port_wait(ps);
/* Cancelling a timer that just triggered, does no harm. */
cancel_timer(&ps->timer);
assert(!(ps->flags & FLAG_BUSY));
dprintf(V_REQ, ("%s: end of command -- %s\n", ahci_portname(ps),
(ps->flags & (FLAG_FAILURE | FLAG_BARRIER)) ?
"failure" : "success"));
/* The barrier flag may have been set if a device was disconnected; the
* failure flag may have already been cleared if a new device has
* connected afterwards. Hence, check both.
*/
if (ps->flags & (FLAG_FAILURE | FLAG_BARRIER))
return EIO;
return OK;
}
/*===========================================================================*
* port_alloc *
*===========================================================================*/
PRIVATE void port_alloc(struct port_state *ps)
{
/* Allocate memory for the given port. We try to cram everything into
* one 4K-page in order to limit memory usage as much as possible.
* More memory may be allocated on demand later, but allocation failure
* should be fatal only here.
*/
size_t fis_off, tmp_off, ct_off; int i;
fis_off = AHCI_CL_SIZE + AHCI_FIS_SIZE - 1;
fis_off -= fis_off % AHCI_FIS_SIZE;
tmp_off = fis_off + AHCI_FIS_SIZE + AHCI_TMP_ALIGN - 1;
tmp_off -= tmp_off % AHCI_TMP_ALIGN;
ct_off = tmp_off + AHCI_TMP_SIZE + AHCI_CT_ALIGN - 1;
ct_off -= ct_off % AHCI_CT_ALIGN;
ps->mem_size = ct_off + AHCI_CT_SIZE;
ps->mem_base = alloc_contig(ps->mem_size, AC_ALIGN4K, &ps->mem_phys);
if (ps->mem_base == NULL)
panic("unable to allocate port memory");
memset(ps->mem_base, 0, ps->mem_size);
ps->cl_base = (u32_t *) ps->mem_base;
ps->cl_phys = ps->mem_phys;
assert(ps->cl_phys % AHCI_CL_SIZE == 0);
ps->fis_base = (u32_t *) (ps->mem_base + fis_off);
ps->fis_phys = ps->mem_phys + fis_off;
assert(ps->fis_phys % AHCI_FIS_SIZE == 0);
ps->tmp_base = (u8_t *) (ps->mem_base + tmp_off);
ps->tmp_phys = ps->mem_phys + tmp_off;
assert(ps->tmp_phys % AHCI_TMP_ALIGN == 0);
ps->ct_base[0] = ps->mem_base + ct_off;
ps->ct_phys[0] = ps->mem_phys + ct_off;
assert(ps->ct_phys[0] % AHCI_CT_ALIGN == 0);
/* Tell the controller about some of the physical addresses. */
ps->reg[AHCI_PORT_FBU] = 0L;
ps->reg[AHCI_PORT_FB] = ps->fis_phys;
ps->reg[AHCI_PORT_CLBU] = 0L;
ps->reg[AHCI_PORT_CLB] = ps->cl_phys;
/* Do not yet allocate memory for other commands or the sector padding
* buffer. We currently only use one command anyway, and we cannot
* allocate the sector padding buffer until we know the medium's sector
* size (nor will we always need one).
*/
for (i = 1; i < hba_state.nr_cmds; i++)
ps->ct_base[i] = NULL;
ps->pad_base = NULL;
ps->pad_size = 0;
}
/*===========================================================================*
* port_free *
*===========================================================================*/
PRIVATE void port_free(struct port_state *ps)
{
/* Free previously allocated memory for the given port.
*/
int i;
if (ps->pad_base != NULL)
free_contig(ps->pad_base, ps->pad_size);
/* The first command table is part of the primary memory page. */
for (i = 1; i < hba_state.nr_cmds; i++)
if (ps->ct_base[i] != NULL)
free_contig(ps->ct_base[i], AHCI_CT_SIZE);
free_contig(ps->mem_base, ps->mem_size);
}
/*===========================================================================*
* port_init *
*===========================================================================*/
PRIVATE void port_init(struct port_state *ps)
{
/* Initialize the given port.
*/
u32_t cmd;
/* Initialize the port state structure. */
ps->state = STATE_SPIN_UP;
ps->flags = FLAG_BUSY;
ps->sector_size = 0L;
ps->open_count = 0;
init_timer(&ps->timer);
ps->reg = (u32_t *) ((u8_t *) hba_state.base +
AHCI_MEM_BASE_SIZE + AHCI_MEM_PORT_SIZE * (ps - port_state));
/* Make sure the port is in a known state. */
port_stop(ps);
/* Allocate memory for the port. */
port_alloc(ps);
/* Just listen for device status change events for now. */
ps->reg[AHCI_PORT_IE] = AHCI_PORT_IE_PRCE;
/* Perform a reset on the device. */
cmd = ps->reg[AHCI_PORT_CMD];
ps->reg[AHCI_PORT_CMD] = cmd | AHCI_PORT_CMD_SUD;
ps->reg[AHCI_PORT_SCTL] = AHCI_PORT_SCTL_DET_INIT;
micro_delay(SPINUP_DELAY * 1000); /* SPINUP_DELAY is in ms */
ps->reg[AHCI_PORT_SCTL] = AHCI_PORT_SCTL_DET_NONE;
set_timer(&ps->timer, ahci_spinup_timeout, port_timeout,
ps - port_state);
}
/*===========================================================================*
* ahci_probe *
*===========================================================================*/
PRIVATE int ahci_probe(int instance)
{
/* Find a matching PCI device.
*/
int r, skip, devind;
u16_t vid, did;
u8_t bcr, scr, pir;
u32_t t3;
pci_init();
r = pci_first_dev(&devind, &vid, &did);
if (r <= 0)
return -1;
skip = 0;
for (;;) {
/* Get the class register values. */
bcr = pci_attr_r8(devind, PCI_BCR);
scr = pci_attr_r8(devind, PCI_SCR);
pir = pci_attr_r8(devind, PCI_PIFR);
t3 = (bcr << 16) | (scr << 8) | pir;
/* If the device is a match, see if we have to leave it to
* another driver instance.
*/
if (t3 == PCI_T3_AHCI) {
if (skip == instance)
break;
skip++;
}
r = pci_next_dev(&devind, &vid, &did);
if (r <= 0)
return -1;
}
pci_reserve(devind);
return devind;
}
/*===========================================================================*
* ahci_reset *
*===========================================================================*/
PRIVATE void ahci_reset(void)
{
/* Reset the HBA. Do not enable AHCI mode afterwards.
*/
u32_t ghc;
ghc = hba_state.base[AHCI_HBA_GHC];
hba_state.base[AHCI_HBA_GHC] = ghc | AHCI_HBA_GHC_AE;
hba_state.base[AHCI_HBA_GHC] = ghc | AHCI_HBA_GHC_AE | AHCI_HBA_GHC_HR;
SPIN_UNTIL(!(hba_state.base[AHCI_HBA_GHC] & AHCI_HBA_GHC_HR),
RESET_DELAY);
if (hba_state.base[AHCI_HBA_GHC] & AHCI_HBA_GHC_HR)
panic("unable to reset HBA");
}
/*===========================================================================*
* ahci_init *
*===========================================================================*/
PRIVATE void ahci_init(int devind)
{
/* Initialize the device.
*/
u32_t base, size, cap, ghc, mask;
int r, port, ioflag;
if ((r = pci_get_bar(devind, PCI_BAR_6, &base, &size, &ioflag)) != OK)
panic("unable to retrieve BAR: %d", r);
if (ioflag)
panic("invalid BAR type");
/* There must be at least one port, and at most NR_PORTS ports. Limit
* the actual total number of ports to the size of the exposed area.
*/
if (size < AHCI_MEM_BASE_SIZE + AHCI_MEM_PORT_SIZE)
panic("HBA memory size too small: %lu", size);
size = MIN(size, AHCI_MEM_BASE_SIZE + AHCI_MEM_PORT_SIZE * NR_PORTS);
hba_state.nr_ports = (size - AHCI_MEM_BASE_SIZE) / AHCI_MEM_PORT_SIZE;
/* Map the register area into local memory. */
hba_state.base = (u32_t *) vm_map_phys(SELF, (void *) base, size);
hba_state.size = size;
if (hba_state.base == MAP_FAILED)
panic("unable to map HBA memory");
/* Retrieve, allocate and enable the controller's IRQ. */
hba_state.irq = pci_attr_r8(devind, PCI_ILR);
if ((r = sys_irqsetpolicy(hba_state.irq, 0, &hba_state.hook_id)) != OK)
panic("unable to register IRQ: %d", r);
if ((r = sys_irqenable(&hba_state.hook_id)) != OK)
panic("unable to enable IRQ: %d", r);
/* Reset the HBA. */
ahci_reset();
/* Enable AHCI and interrupts. */
ghc = hba_state.base[AHCI_HBA_GHC];
hba_state.base[AHCI_HBA_GHC] = ghc | AHCI_HBA_GHC_AE | AHCI_HBA_GHC_IE;
/* Limit the maximum number of commands to the controller's value. */
/* Note that we currently use only one command anyway. */
cap = hba_state.base[AHCI_HBA_CAP];
hba_state.nr_cmds = MIN(NR_CMDS,
((cap >> AHCI_HBA_CAP_NCS_SHIFT) & AHCI_HBA_CAP_NCS_MASK) + 1);
dprintf(V_INFO, ("%s: HBA v%d.%d%d, %ld ports, %ld commands, "
"%s queuing, IRQ %d\n",
ahci_name(),
(int) (hba_state.base[AHCI_HBA_VS] >> 16),
(int) ((hba_state.base[AHCI_HBA_VS] >> 8) & 0xFF),
(int) (hba_state.base[AHCI_HBA_VS] & 0xFF),
((cap >> AHCI_HBA_CAP_NP_SHIFT) & AHCI_HBA_CAP_NP_MASK) + 1,
((cap >> AHCI_HBA_CAP_NCS_SHIFT) & AHCI_HBA_CAP_NCS_MASK) + 1,
(cap & AHCI_HBA_CAP_SNCQ) ? "supports" : "no",
hba_state.irq));
dprintf(V_INFO, ("%s: CAP %08lx, CAP2 %08lx, PI %08lx\n",
ahci_name(), cap, hba_state.base[AHCI_HBA_CAP2],
hba_state.base[AHCI_HBA_PI]));
/* Initialize each of the implemented ports. We ignore CAP.NP. */
mask = hba_state.base[AHCI_HBA_PI];
for (port = 0; port < hba_state.nr_ports; port++) {
port_state[port].device = NO_DEVICE;
port_state[port].state = STATE_NO_PORT;
if (mask & (1L << port))
port_init(&port_state[port]);
}
}
/*===========================================================================*
* ahci_stop *
*===========================================================================*/
PRIVATE void ahci_stop(void)
{
/* Disable AHCI, and clean up resources to the extent possible.
*/
int r, port;
for (port = 0; port < hba_state.nr_ports; port++) {
if (port_state[port].state != STATE_NO_PORT) {
port_stop(&port_state[port]);
port_free(&port_state[port]);
}
}
ahci_reset();
if ((r = vm_unmap_phys(SELF, hba_state.base, hba_state.size)) != OK)
panic("unable to unmap HBA memory: %d", r);
if ((r = sys_irqrmpolicy(&hba_state.hook_id)) != OK)
panic("unable to deregister IRQ: %d", r);
}
/*===========================================================================*
* ahci_alarm *
*===========================================================================*/
PRIVATE void ahci_alarm(struct driver *UNUSED(dp), message *m)
{
/* Process an alarm.
*/
/* Call the port-specific handler for each port that timed out. */
expire_timers(m->NOTIFY_TIMESTAMP);
}
/*===========================================================================*
* ahci_intr *
*===========================================================================*/
PRIVATE int ahci_intr(struct driver *UNUSED(dr), message *UNUSED(m))
{
/* Process an interrupt.
*/
u32_t mask;
int r, port;
/* Handle an interrupt for each port that has the interrupt bit set. */
mask = hba_state.base[AHCI_HBA_IS];
for (port = 0; port < hba_state.nr_ports; port++)
if (mask & (1L << port))
port_intr(&port_state[port]);
/* Clear the bits that we processed. */
hba_state.base[AHCI_HBA_IS] = mask;
/* Reenable the interrupt. */
if ((r = sys_irqenable(&hba_state.hook_id)) != OK)
panic("unable to enable IRQ: %d", r);
return OK;
}
/*===========================================================================*
* ahci_get_var *
*===========================================================================*/
PRIVATE 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 *
*===========================================================================*/
PRIVATE void ahci_get_params(void)
{
/* Retrieve and parse parameters passed to this driver, except the
* device-to-port mapping, which has to be parsed later.
*/
long v;
/* Find out which driver instance we are. */
v = 0;
(void) env_parse("instance", "d", 0, &v, 0, 255);
ahci_instance = (int) v;
/* Initialize the verbosity level. */
v = V_ERR;
(void) env_parse("ahci_verbose", "d", 0, &v, V_NONE, V_REQ);
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_set_mapping *
*===========================================================================*/
PRIVATE void ahci_set_mapping(void)
{
/* Construct a mapping from device nodes to port numbers.
*/
char key[16], val[32], *p;
unsigned int port;
int i, j;
/* Start off with a mapping that includes implemented ports only, in
* order. We choose this mapping over an identity mapping to maximize
* the chance that the user will be able to access the first MAX_DRIVES
* devices. Note that we can only do this after initializing the HBA.
*/
for (i = j = 0; i < NR_PORTS && j < MAX_DRIVES; i++)
if (port_state[i].state != STATE_NO_PORT)
ahci_map[j++] = i;
for ( ; j < MAX_DRIVES; j++)
ahci_map[j] = NO_PORT;
/* See if the user specified a custom mapping. Unlike all other
* configuration options, this is a per-instance setting.
*/
strcpy(key, "ahci0_map");
key[4] += ahci_instance;
if (env_get_param(key, val, sizeof(val)) == OK) {
/* Parse the mapping, which is assumed to be a comma-separated
* list of zero-based port numbers.
*/
p = val;
for (i = 0; i < MAX_DRIVES; i++) {
if (*p) {
port = (unsigned int) strtoul(p, &p, 0);
if (*p) p++;
ahci_map[i] = port % NR_PORTS;
}
else ahci_map[i] = NO_PORT;
}
}
/* Create a reverse mapping. */
for (i = 0; i < MAX_DRIVES; i++)
if ((j = ahci_map[i]) != NO_PORT)
port_state[j].device = i;
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
PRIVATE int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
{
/* Initialize the driver.
*/
int devind;
/* Get command line parameters. */
ahci_get_params();
/* Probe for recognized devices, skipping matches as appropriate. */
devind = ahci_probe(ahci_instance);
if (devind < 0)
panic("no matching device found");
/* Initialize the device we found. */
ahci_init(devind);
/* Create a mapping from device nodes to port numbers. */
ahci_set_mapping();
/* Announce we are up. */
driver_announce();
return OK;
}
/*===========================================================================*
* sef_cb_signal_handler *
*===========================================================================*/
PRIVATE void sef_cb_signal_handler(int signo)
{
/* In case of a termination signal, shut down this driver.
*/
int port;
if (signo != SIGTERM) return;
/* If any ports are still opened, assume that the system is being shut
* down, and stay up until the last device has been closed.
*/
ahci_exiting = TRUE;
for (port = 0; port < hba_state.nr_ports; port++)
if (port_state[port].open_count > 0)
return;
/* If not, stop the driver and exit immediately. */
ahci_stop();
exit(0);
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
PRIVATE void sef_local_startup(void)
{
/* Set callbacks and initialize the System Event Framework (SEF).
*/
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_lu(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fresh);
/* Register signal callbacks. */
sef_setcb_signal_handler(sef_cb_signal_handler);
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* ahci_name *
*===========================================================================*/
PRIVATE char *ahci_name(void)
{
/* Return a printable name for the controller and possibly the
* currently selected port.
*/
static char name[] = "AHCI0";
if (current_port != NULL)
return ahci_portname(current_port);
name[4] = '0' + ahci_instance;
return name;
}
/*===========================================================================*
* ahci_portname *
*===========================================================================*/
PRIVATE char *ahci_portname(struct port_state *ps)
{
/* Return a printable name for the given port. Whenever we can, print a
* "Dx" device number rather than a "Pxx" port number, because the user
* may not be aware of the mapping currently in use.
*/
static char name[] = "AHCI0-P00";
name[4] = '0' + ahci_instance;
if (ps->device == NO_DEVICE) {
name[6] = 'P';
name[7] = '0' + (ps - port_state) / 10;
name[8] = '0' + (ps - port_state) % 10;
}
else {
name[6] = 'D';
name[7] = '0' + ps->device;
name[8] = 0;
}
return name;
}
/*===========================================================================*
* ahci_prepare *
*===========================================================================*/
PRIVATE struct device *ahci_prepare(int minor)
{
/* Select a device, in the form of a port and (sub)partition, based on
* the given minor device number and the device-to-port mapping.
*/
int port;
current_port = NULL;
current_dev = NULL;
if (minor < NR_MINORS) {
port = ahci_map[minor / DEV_PER_DRIVE];
if (port == NO_PORT)
return NULL;
current_port = &port_state[port];
current_dev = &current_port->part[minor % DEV_PER_DRIVE];
}
else if ((unsigned) (minor -= MINOR_d0p0s0) < NR_SUBDEVS) {
port = ahci_map[minor / SUB_PER_DRIVE];
if (port == NO_PORT)
return NULL;
current_port = &port_state[port];
current_dev = &current_port->subpart[minor % SUB_PER_DRIVE];
}
return current_dev;
}
/*===========================================================================*
* ahci_open *
*===========================================================================*/
PRIVATE int ahci_open(struct driver *UNUSED(dp), message *m)
{
/* Open a device.
*/
int r;
if (ahci_prepare(m->DEVICE) == NULL)
return ENXIO;
/* If we are still in the process of initializing this port or device,
* wait for completion of that phase first.
*/
if (current_port->flags & FLAG_BUSY)
port_wait(current_port);
/* The device may only be opened if it is now properly functioning. */
if (current_port->state != STATE_GOOD_DEV)
return ENXIO;
/* Some devices may only be opened in read-only mode. */
if ((current_port->flags & FLAG_READONLY) && (m->COUNT & W_BIT))
return EACCES;
if (current_port->open_count == 0) {
/* The first open request. Clear the barrier flag, if set. */
current_port->flags &= ~FLAG_BARRIER;
/* Recheck media only when nobody is using the device. */
if ((current_port->flags & FLAG_ATAPI) &&
(r = atapi_check_medium(current_port, 0)) != OK)
return r;
/* After rechecking the media, the partition table must always
* be read. This is also a convenient time to do it for
* nonremovable devices. Start by resetting the partition
* tables and setting the working size of the entire device.
*/
memset(current_port->part, 0, sizeof(current_port->part));
memset(current_port->subpart, 0,
sizeof(current_port->subpart));
current_port->part[0].dv_size =
mul64(current_port->lba_count,
cvu64(current_port->sector_size));
partition(&ahci_dtab, current_port->device * DEV_PER_DRIVE,
P_PRIMARY, !!(current_port->flags & FLAG_ATAPI));
}
else {
/* If the barrier flag is set, deny new open requests until the
* device is fully closed first.
*/
if (current_port->flags & FLAG_BARRIER)
return ENXIO;
}
current_port->open_count++;
return OK;
}
/*===========================================================================*
* ahci_close *
*===========================================================================*/
PRIVATE int ahci_close(struct driver *UNUSED(dp), message *m)
{
/* Close a device.
*/
int port;
if (ahci_prepare(m->DEVICE) == NULL)
return ENXIO;
if (current_port->open_count <= 0) {
dprintf(V_ERR, ("%s: closing already-closed port\n",
ahci_portname(current_port)));
return EINVAL;
}
current_port->open_count--;
/* If we've been told to terminate, check whether all devices are now
* closed. If so, tell libdriver to quit after replying to the close.
*/
if (ahci_exiting) {
for (port = 0; port < hba_state.nr_ports; port++)
if (port_state[port].open_count > 0)
break;
if (port == hba_state.nr_ports) {
ahci_stop();
driver_terminate();
}
}
return OK;
}
/*===========================================================================*
* ahci_transfer *
*===========================================================================*/
PRIVATE int ahci_transfer(endpoint_t endpt, int opcode, u64_t position,
iovec_t *iovec, unsigned int nr_req)
{
/* Perform data transfer on the selected device.
*/
u64_t pos, eof;
assert(current_port != NULL);
assert(current_dev != NULL);
if (current_port->state != STATE_GOOD_DEV ||
(current_port->flags & FLAG_BARRIER))
return EIO;
if (nr_req > NR_IOREQS)
return EINVAL;
/* Check for basic end-of-partition condition: if the start position of
* the request is outside the partition, return success immediately.
* The size of the request is obtained, and possibly reduced, later.
*/
if (cmp64(position, current_dev->dv_size) >= 0)
return OK;
pos = add64(current_dev->dv_base, position);
eof = add64(current_dev->dv_base, current_dev->dv_size);
return port_transfer(current_port, 0, pos, eof, endpt,
(iovec_s_t *) iovec, nr_req, opcode == DEV_SCATTER_S);
}
/*===========================================================================*
* ahci_geometry *
*===========================================================================*/
PRIVATE void ahci_geometry(struct partition *part)
{
/* Fill in old-style geometry. We have to supply nonzero numbers, or
* part(8) crashes.
*/
assert(current_port->sector_size != 0);
part->cylinders = div64u(current_port->part[0].dv_size,
current_port->sector_size) / (64 * 32);
part->heads = 64;
part->sectors = 32;
}
/*===========================================================================*
* ahci_other *
*===========================================================================*/
PRIVATE int ahci_other(struct driver *UNUSED(dp), message *m)
{
/* Process any messages not covered by the other calls.
* This function only implements IOCTLs.
*/
if (m->m_type != DEV_IOCTL_S)
return EINVAL;
switch (m->REQUEST) {
case DIOCEJECT:
if (ahci_prepare(m->DEVICE) == NULL)
return ENXIO;
if (current_port->state != STATE_GOOD_DEV ||
!(current_port->flags & FLAG_ATAPI))
return EINVAL;
return atapi_load_eject(current_port, 0, FALSE /*load*/);
case DIOCOPENCT:
if (ahci_prepare(m->DEVICE) == NULL)
return ENXIO;
return sys_safecopyto(m->IO_ENDPT, (cp_grant_id_t) m->IO_GRANT,
0, (vir_bytes) &current_port->open_count,
sizeof(current_port->open_count), D);
}
return EINVAL;
}
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC int main(int argc, char **argv)
{
/* Driver task.
*/
env_setargs(argc, argv);
sef_local_startup();
driver_task(&ahci_dtab, DRIVER_STD);
return 0;
}
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