Commit ATAPI-CAM for ATAmkIII. Improvements and changes:
- newbus plumbing. Each atapicam bus is a child off of a parent ata channel bus. This is somewhat of a hack, but allows the ata core to be completely free of atapicam knowledge. - No more global lists of softc's and no more groping around in internal ata structures on each command. - Giant-free operation of the completion handler. - Per-bus mutex for protecting the busy list and synchronizing detach. - Lots of streamlining and dead code elimination, better adherence to the CAM locking protocol. This feature still requires that the appropriate atapi-* driver be present for each atapi device that you want to talk to (i.e. atapi-cd for cdroms). It does work both compiled into the kernel and as a loadable module. Reviewed by: thomas, sos
This commit is contained in:
scottl
parent
8a050fbf3b
commit
95301ebbdf
@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/mutex.h>
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#include <sys/sema.h>
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#include <vm/uma.h>
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#include <machine/resource.h>
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#include <machine/bus.h>
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#include <cam/cam.h>
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@ -51,6 +52,25 @@ __FBSDID("$FreeBSD$");
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#include <cam/scsi/scsi_all.h>
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#include <dev/ata/ata-all.h>
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#include <ata_if.h>
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/* private data associated with an ATA bus */
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struct atapi_xpt_softc {
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struct ata_device atapi_cam_dev; /* must be first */
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device_t dev;
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device_t parent;
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struct ata_channel *ata_ch;
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struct cam_path *path;
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struct cam_sim *sim;
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int flags;
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#define BUS_REGISTERED 0x01
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#define RESOURCE_SHORTAGE 0x02
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#define DETACHING 0x04
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TAILQ_HEAD(,atapi_hcb) pending_hcbs;
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struct ata_device *atadev[2];
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struct mtx state_lock;
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};
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/* hardware command descriptor block */
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struct atapi_hcb {
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@ -67,34 +87,23 @@ struct atapi_hcb {
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TAILQ_ENTRY(atapi_hcb) chain;
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};
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/* private data associated with an ATA bus */
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struct atapi_xpt_softc {
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struct ata_channel *ata_ch;
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struct cam_path *path;
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struct cam_sim *sim;
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int flags;
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#define BUS_REGISTERED 0x01
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#define RESOURCE_SHORTAGE 0x02
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TAILQ_HEAD(,atapi_hcb) pending_hcbs;
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LIST_ENTRY(atapi_xpt_softc) chain;
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};
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enum reinit_reason { BOOT_ATTACH, ATTACH, RESET };
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static struct mtx atapicam_softc_mtx;
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static LIST_HEAD(,atapi_xpt_softc) all_buses = LIST_HEAD_INITIALIZER(all_buses);
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/* Device methods */
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static int atapi_cam_identify(device_t *dev, device_t parent);
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static int atapi_cam_probe(device_t dev);
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static int atapi_cam_attach(device_t dev);
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static int atapi_cam_detach(device_t dev);
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static int atapi_cam_reinit(device_t dev);
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/* CAM XPT methods */
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static void atapi_action(struct cam_sim *, union ccb *);
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static void atapi_poll(struct cam_sim *);
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static void atapi_async(void *, u_int32_t, struct cam_path *, void *);
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static void atapi_async1(void *, u_int32_t, struct cam_path *, void *);
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static void atapi_cb(struct ata_request *);
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/* internal functions */
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static void reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason);
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static void setup_dev(struct atapi_xpt_softc *, struct ata_device *);
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static void setup_async_cb(struct atapi_xpt_softc *, uint32_t);
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static void cam_rescan_callback(struct cam_periph *, union ccb *);
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static void cam_rescan(struct cam_sim *);
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@ -102,64 +111,97 @@ static void free_hcb_and_ccb_done(struct atapi_hcb *, u_int32_t);
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static struct atapi_hcb *allocate_hcb(struct atapi_xpt_softc *, int, int, union ccb *);
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static void free_hcb(struct atapi_hcb *hcb);
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static void free_softc(struct atapi_xpt_softc *scp);
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static struct atapi_xpt_softc *get_softc(struct ata_channel *ata_ch);
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static struct ata_device *get_ata_device(struct atapi_xpt_softc *scp, int id);
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static MALLOC_DEFINE(M_ATACAM, "ATA CAM transport", "ATA driver CAM-XPT layer");
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void
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atapi_cam_attach_bus(struct ata_channel *ata_ch)
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static device_method_t atapi_cam_methods[] = {
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DEVMETHOD(device_identify, atapi_cam_identify),
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DEVMETHOD(device_probe, atapi_cam_probe),
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DEVMETHOD(device_attach, atapi_cam_attach),
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DEVMETHOD(device_detach, atapi_cam_detach),
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DEVMETHOD(ata_reinit, atapi_cam_reinit),
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{0, 0}
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};
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static driver_t atapi_cam_driver = {
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"atapicam",
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atapi_cam_methods,
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sizeof(struct atapi_xpt_softc)
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};
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static devclass_t atapi_cam_devclass;
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DRIVER_MODULE(atapicam, ata, atapi_cam_driver, atapi_cam_devclass, 0, 0);
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MODULE_VERSION(atapicam, 1);
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MODULE_DEPEND(atapicam, ata, 1, 1, 1);
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static int
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atapi_cam_identify(device_t *dev, device_t parent)
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{
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/* Assume one atapicam instance per parent channel instance. */
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device_add_child(parent, "atapicam", -1);
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return (0);
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}
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static int
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atapi_cam_probe(device_t dev)
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{
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device_set_desc(dev, "ATAPI CAM Attachment");
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return (0);
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}
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static int
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atapi_cam_attach(device_t dev)
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{
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struct atapi_xpt_softc *scp = NULL;
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struct cam_devq *devq = NULL;
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struct cam_sim *sim = NULL;
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struct cam_path *path = NULL;
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int unit;
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int unit, error;
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GIANT_REQUIRED;
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if (mtx_initialized(&atapicam_softc_mtx) == 0)
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mtx_init(&atapicam_softc_mtx, "ATAPI/CAM softc mutex", NULL, MTX_DEF);
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mtx_lock(&atapicam_softc_mtx);
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LIST_FOREACH(scp, &all_buses, chain) {
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if (scp->ata_ch == ata_ch)
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break;
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scp = (struct atapi_xpt_softc *)device_get_softc(dev);
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if (scp == NULL) {
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device_printf(dev, "Cannot get softc\n");
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return (ENOMEM);
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}
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mtx_unlock(&atapicam_softc_mtx);
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if (scp != NULL)
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return;
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mtx_init(&scp->state_lock, "ATAPICAM lock", NULL, MTX_DEF);
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if ((scp = malloc(sizeof(struct atapi_xpt_softc),
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M_ATACAM, M_NOWAIT | M_ZERO)) == NULL)
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goto error;
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/*
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* The ATA core expects all of its children to have an ata_device.
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* Assign an invalid unit number so that we can be properly ignored.
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*/
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scp->atapi_cam_dev.unit = -1;
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scp->atapi_cam_dev.dev = dev;
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scp->ata_ch = ata_ch;
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scp->dev = dev;
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scp->parent = device_get_parent(dev);
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scp->ata_ch = device_get_softc(scp->parent);
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TAILQ_INIT(&scp->pending_hcbs);
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LIST_INSERT_HEAD(&all_buses, scp, chain);
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unit = device_get_unit(ata_ch->dev);
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unit = device_get_unit(dev);
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if ((devq = cam_simq_alloc(16)) == NULL)
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goto error;
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if ((devq = cam_simq_alloc(16)) == NULL) {
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error = ENOMEM;
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goto out;
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}
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if ((sim = cam_sim_alloc(atapi_action, atapi_poll, "ata",
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(void *)scp, unit, 1, 1, devq)) == NULL) {
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cam_simq_free(devq);
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goto error;
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error = ENOMEM;
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goto out;
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}
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scp->sim = sim;
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if (xpt_bus_register(sim, 0) != CAM_SUCCESS) {
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goto error;
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error = EINVAL;
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goto out;
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}
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scp->flags |= BUS_REGISTERED;
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if (xpt_create_path(&path, /*periph*/ NULL,
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cam_sim_path(sim), CAM_TARGET_WILDCARD,
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CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
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goto error;
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error = ENOMEM;
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goto out;
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}
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scp->path = path;
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@ -167,25 +209,33 @@ atapi_cam_attach_bus(struct ata_channel *ata_ch)
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setup_async_cb(scp, AC_LOST_DEVICE);
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reinit_bus(scp, cold ? BOOT_ATTACH : ATTACH);
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return;
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error = 0;
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error:
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free_softc(scp);
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out:
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if (error != 0)
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free_softc(scp);
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return (error);
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}
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void
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atapi_cam_detach_bus(struct ata_channel *ata_ch)
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static int
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atapi_cam_detach(device_t dev)
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{
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struct atapi_xpt_softc *scp = get_softc(ata_ch);
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struct atapi_xpt_softc *scp = device_get_softc(dev);
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mtx_lock(&Giant);
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free_softc(scp);
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xpt_freeze_simq(scp->sim, 1 /*count*/);
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mtx_unlock(&Giant);
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mtx_lock(&scp->state_lock);
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scp->flags |= DETACHING;
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mtx_unlock(&scp->state_lock);
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free_softc(scp);
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return (0);
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}
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void
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atapi_cam_reinit_bus(struct ata_channel *ata_ch) {
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struct atapi_xpt_softc *scp = get_softc(ata_ch);
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static int
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atapi_cam_reinit(device_t dev) {
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struct atapi_xpt_softc *scp = device_get_softc(dev);
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/*
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* scp might be null if the bus is being reinitialised during
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@ -193,21 +243,39 @@ atapi_cam_reinit_bus(struct ata_channel *ata_ch) {
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*/
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if (scp != NULL) {
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mtx_lock(&Giant);
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reinit_bus(scp, RESET);
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mtx_unlock(&Giant);
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}
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return (0);
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}
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static void
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reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason) {
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struct ata_device *atadev;
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device_t *children;
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int nchildren, i;
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GIANT_REQUIRED;
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if (device_get_children(scp->parent, &children, &nchildren) != 0) {
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return;
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}
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if (scp->ata_ch->devices & ATA_ATAPI_MASTER)
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setup_dev(scp, &scp->ata_ch->device[MASTER]);
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if (scp->ata_ch->devices & ATA_ATAPI_SLAVE)
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setup_dev(scp, &scp->ata_ch->device[SLAVE]);
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mtx_lock(&scp->state_lock);
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scp->atadev[0] = NULL;
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scp->atadev[1] = NULL;
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for (i = 0; i < nchildren; i++) {
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/* XXX Does the child need to actually be attached yet? */
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if (children[i] != NULL) {
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atadev = device_get_softc(children[i]);
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if ((atadev->unit == ATA_MASTER) &&
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(scp->ata_ch->devices & ATA_ATAPI_MASTER) != 0)
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scp->atadev[0] = atadev;
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if ((atadev->unit == ATA_SLAVE) &&
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(scp->ata_ch->devices & ATA_ATAPI_SLAVE) != 0)
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scp->atadev[1] = atadev;
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}
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}
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mtx_unlock(&scp->state_lock);
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free(children, M_TEMP);
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switch (reason) {
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case BOOT_ATTACH:
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@ -221,30 +289,19 @@ reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason) {
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}
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}
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static void
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setup_dev(struct atapi_xpt_softc *scp, struct ata_device *atp)
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{
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if (atp->softc == NULL) {
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ata_set_name(atp, "atapicam",
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2 * device_get_unit(atp->channel->dev) +
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(atp->unit == ATA_MASTER) ? 0 : 1);
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atp->softc = (void *)scp;
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}
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}
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static void
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setup_async_cb(struct atapi_xpt_softc *scp, uint32_t events)
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{
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struct ccb_setasync csa;
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GIANT_REQUIRED;
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mtx_lock(&Giant);
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xpt_setup_ccb(&csa.ccb_h, scp->path, /*priority*/ 5);
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csa.ccb_h.func_code = XPT_SASYNC_CB;
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csa.event_enable = events;
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csa.callback = &atapi_async;
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csa.callback_arg = scp->sim;
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xpt_action((union ccb *) &csa);
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mtx_unlock(&Giant);
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}
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static void
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@ -262,6 +319,7 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
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switch (ccb_h->func_code) {
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case XPT_PATH_INQ: {
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struct ccb_pathinq *cpi = &ccb->cpi;
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int tid = ccb_h->target_id;
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cpi->version_num = 1;
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cpi->hba_inquiry = 0;
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@ -281,8 +339,13 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
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cpi->bus_id = cam_sim_bus(sim);
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cpi->base_transfer_speed = 3300;
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if (softc->ata_ch && ccb_h->target_id != CAM_TARGET_WILDCARD) {
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switch (softc->ata_ch->device[ccb_h->target_id].mode) {
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if (softc->ata_ch && tid != CAM_TARGET_WILDCARD) {
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if (softc->atadev[tid] == NULL) {
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ccb->ccb_h.status = CAM_DEV_NOT_THERE;
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xpt_done(ccb);
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return;
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}
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switch (softc->atadev[ccb_h->target_id]->mode) {
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case ATA_PIO1:
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cpi->base_transfer_speed = 5200;
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break;
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@ -320,10 +383,9 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
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case XPT_RESET_DEV: {
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int tid = ccb_h->target_id;
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struct ata_device *dev = get_ata_device(softc, tid);
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CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("dev reset\n"));
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ata_controlcmd(dev, ATA_ATAPI_RESET, 0, 0, 0);
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ata_controlcmd(softc->atadev[tid], ATA_ATAPI_RESET, 0, 0, 0);
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ccb->ccb_h.status = CAM_REQ_CMP;
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xpt_done(ccb);
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return;
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@ -331,7 +393,7 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
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case XPT_RESET_BUS:
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CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("bus reset\n"));
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ata_reinit(softc->ata_ch);
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ata_reinit(softc->parent);
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ccb->ccb_h.status = CAM_REQ_CMP;
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xpt_done(ccb);
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return;
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@ -370,22 +432,32 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
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case XPT_SCSI_IO: {
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struct ccb_scsiio *csio = &ccb->csio;
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int tid = ccb_h->target_id, lid = ccb_h->target_lun;
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struct ata_device *dev = get_ata_device(softc, tid);
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int request_flags = ATA_R_QUIET | ATA_R_ATAPI;
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CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("XPT_SCSI_IO\n"));
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mtx_lock(&softc->state_lock);
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if (softc->flags & DETACHING) {
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ccb->ccb_h.status = CAM_REQ_ABORTED;
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xpt_done(ccb);
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mtx_unlock(&softc->state_lock);
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return;
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}
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if (softc->atadev[tid] == NULL) {
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ccb->ccb_h.status = CAM_DEV_NOT_THERE;
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xpt_done(ccb);
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mtx_unlock(&softc->state_lock);
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return;
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}
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/* check that this request was not aborted already */
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if ((ccb_h->status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
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printf("XPT_SCSI_IO received but already in progress?\n");
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xpt_done(ccb);
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mtx_unlock(&softc->state_lock);
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return;
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}
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if (dev == NULL) {
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CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
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("SCSI IO received for invalid device\n"));
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goto action_invalid;
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}
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if (lid > 0) {
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CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
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("SCSI IO received for invalid lun %d\n", lid));
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@ -414,10 +486,10 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
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/* No flags need to be set */
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break;
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default:
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ata_prtdev(dev, "unknown IO operation\n");
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device_printf(softc->dev, "unknown IO operation\n");
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goto action_invalid;
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}
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if (dev->mode < ATA_DMA)
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if (softc->atadev[tid]->mode < ATA_DMA)
|
||||
request_flags &= ~ATA_R_DMA;
|
||||
|
||||
if ((hcb = allocate_hcb(softc, unit, bus, ccb)) == NULL) {
|
||||
@ -491,7 +563,7 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
|
||||
goto action_oom;
|
||||
}
|
||||
}
|
||||
request->device = dev;
|
||||
request->dev = softc->atadev[tid]->dev;
|
||||
request->driver = hcb;
|
||||
request->data = buf;
|
||||
request->bytecount = len;
|
||||
@ -504,6 +576,7 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
|
||||
TAILQ_INSERT_TAIL(&softc->pending_hcbs, hcb, chain);
|
||||
hcb->flags |= QUEUED;
|
||||
ccb_h->status |= CAM_SIM_QUEUED;
|
||||
mtx_unlock(&softc->state_lock);
|
||||
|
||||
ata_queue_request(request);
|
||||
return;
|
||||
@ -550,8 +623,6 @@ atapi_cb(struct ata_request *request)
|
||||
struct ccb_scsiio *csio;
|
||||
u_int32_t rc;
|
||||
|
||||
mtx_lock(&Giant);
|
||||
|
||||
hcb = (struct atapi_hcb *)request->driver;
|
||||
csio = &hcb->ccb->csio;
|
||||
|
||||
@ -593,7 +664,6 @@ atapi_cb(struct ata_request *request)
|
||||
request->flags = ATA_R_QUIET|ATA_R_ATAPI|ATA_R_IMMEDIATE;
|
||||
hcb->flags |= AUTOSENSE;
|
||||
|
||||
mtx_unlock (&Giant);
|
||||
ata_queue_request(request);
|
||||
return;
|
||||
#else
|
||||
@ -615,8 +685,9 @@ atapi_cb(struct ata_request *request)
|
||||
}
|
||||
}
|
||||
|
||||
mtx_lock(&hcb->softc->state_lock);
|
||||
free_hcb_and_ccb_done(hcb, rc);
|
||||
mtx_unlock(&Giant);
|
||||
mtx_unlock(&hcb->softc->state_lock);
|
||||
|
||||
ata_free_request(request);
|
||||
}
|
||||
@ -624,19 +695,21 @@ atapi_cb(struct ata_request *request)
|
||||
static void
|
||||
free_hcb_and_ccb_done(struct atapi_hcb *hcb, u_int32_t status)
|
||||
{
|
||||
struct atapi_xpt_softc *softc = hcb->softc;
|
||||
union ccb *ccb = hcb->ccb;
|
||||
struct atapi_xpt_softc *softc;
|
||||
union ccb *ccb;
|
||||
|
||||
GIANT_REQUIRED;
|
||||
if (hcb == NULL)
|
||||
return;
|
||||
|
||||
if (hcb != NULL) {
|
||||
/* we're about to free a hcb, so the shortage has ended */
|
||||
if (softc->flags & RESOURCE_SHORTAGE) {
|
||||
softc->flags &= ~RESOURCE_SHORTAGE;
|
||||
status |= CAM_RELEASE_SIMQ;
|
||||
}
|
||||
free_hcb(hcb);
|
||||
softc = hcb->softc;
|
||||
ccb = hcb->ccb;
|
||||
|
||||
/* we're about to free a hcb, so the shortage has ended */
|
||||
if (softc->flags & RESOURCE_SHORTAGE) {
|
||||
softc->flags &= ~RESOURCE_SHORTAGE;
|
||||
status |= CAM_RELEASE_SIMQ;
|
||||
}
|
||||
free_hcb(hcb);
|
||||
ccb->ccb_h.status =
|
||||
status | (ccb->ccb_h.status & ~(CAM_STATUS_MASK | CAM_SIM_QUEUED));
|
||||
xpt_done(ccb);
|
||||
@ -644,15 +717,6 @@ free_hcb_and_ccb_done(struct atapi_hcb *hcb, u_int32_t status)
|
||||
|
||||
static void
|
||||
atapi_async(void *callback_arg, u_int32_t code,
|
||||
struct cam_path *path, void *arg)
|
||||
{
|
||||
mtx_lock(&Giant);
|
||||
atapi_async1(callback_arg, code, path, arg);
|
||||
mtx_unlock(&Giant);
|
||||
}
|
||||
|
||||
static void
|
||||
atapi_async1(void *callback_arg, u_int32_t code,
|
||||
struct cam_path* path, void *arg)
|
||||
{
|
||||
struct atapi_xpt_softc *softc;
|
||||
@ -698,8 +762,10 @@ cam_rescan(struct cam_sim *sim)
|
||||
struct cam_path *path;
|
||||
union ccb *ccb = malloc(sizeof(union ccb), M_ATACAM, M_WAITOK | M_ZERO);
|
||||
|
||||
mtx_lock(&Giant);
|
||||
if (xpt_create_path(&path, xpt_periph, cam_sim_path(sim),
|
||||
CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
|
||||
mtx_unlock(&Giant);
|
||||
free(ccb, M_ATACAM);
|
||||
return;
|
||||
}
|
||||
@ -711,6 +777,7 @@ cam_rescan(struct cam_sim *sim)
|
||||
ccb->crcn.flags = CAM_FLAG_NONE;
|
||||
xpt_action(ccb);
|
||||
/* scan is in progress now */
|
||||
mtx_unlock(&Giant);
|
||||
}
|
||||
|
||||
static struct atapi_hcb *
|
||||
@ -743,12 +810,13 @@ free_softc(struct atapi_xpt_softc *scp)
|
||||
{
|
||||
struct atapi_hcb *hcb;
|
||||
|
||||
GIANT_REQUIRED;
|
||||
|
||||
if (scp != NULL) {
|
||||
mtx_lock(&scp->state_lock);
|
||||
TAILQ_FOREACH(hcb, &scp->pending_hcbs, chain) {
|
||||
free_hcb_and_ccb_done(hcb, CAM_UNREC_HBA_ERROR);
|
||||
}
|
||||
mtx_unlock(&scp->state_lock);
|
||||
mtx_lock(&Giant);
|
||||
if (scp->path != NULL) {
|
||||
setup_async_cb(scp, 0);
|
||||
xpt_free_path(scp->path);
|
||||
@ -764,40 +832,7 @@ free_softc(struct atapi_xpt_softc *scp)
|
||||
printf("Can't free %s SIM (still registered)\n",
|
||||
cam_sim_name(scp->sim));
|
||||
}
|
||||
LIST_REMOVE(scp, chain);
|
||||
free(scp, M_ATACAM);
|
||||
}
|
||||
}
|
||||
|
||||
static struct atapi_xpt_softc *
|
||||
get_softc(struct ata_channel *ata_ch) {
|
||||
struct atapi_xpt_softc *scp = NULL;
|
||||
|
||||
mtx_lock(&atapicam_softc_mtx);
|
||||
LIST_FOREACH(scp, &all_buses, chain) {
|
||||
if (scp->ata_ch == ata_ch)
|
||||
break;
|
||||
}
|
||||
mtx_unlock(&atapicam_softc_mtx);
|
||||
return scp;
|
||||
}
|
||||
|
||||
static struct ata_device *
|
||||
get_ata_device(struct atapi_xpt_softc *scp, int id)
|
||||
{
|
||||
int role = ATA_ATAPI_MASTER;
|
||||
|
||||
switch (id) {
|
||||
case 1:
|
||||
role = ATA_ATAPI_SLAVE;
|
||||
/* FALLTHROUGH */
|
||||
|
||||
case 0:
|
||||
if (scp->ata_ch->devices & role)
|
||||
return &scp->ata_ch->device[id];
|
||||
/* FALLTHROUGH */
|
||||
|
||||
default:
|
||||
return NULL;
|
||||
mtx_unlock(&Giant);
|
||||
mtx_destroy(&scp->state_lock);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user