diff options
author | Felix Fietkau <nbd@openwrt.org> | 2014-12-22 20:46:49 +0000 |
---|---|---|
committer | Felix Fietkau <nbd@openwrt.org> | 2014-12-22 20:46:49 +0000 |
commit | 10d27e38778f1865905c7b79e47469497985e55c (patch) | |
tree | 04257bff97c81f43cf7469d3fc9e1ff60d89db2d /target/linux/oxnas/files/drivers/ata | |
parent | f28dad7c6ecc790bd86d0bcd73488445b7a61e87 (diff) | |
download | upstream-10d27e38778f1865905c7b79e47469497985e55c.tar.gz upstream-10d27e38778f1865905c7b79e47469497985e55c.tar.bz2 upstream-10d27e38778f1865905c7b79e47469497985e55c.zip |
oxnas: sata_oxnas: refactoring phase 1
locking for 2nd port and hwraid was added from vendor's GPL code which
doesn't comply with current kernel coding style.
- moved all global variables into host_priv
- renamed locks
- sanetized acquire() and release() parameter list
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43766 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/oxnas/files/drivers/ata')
-rw-r--r-- | target/linux/oxnas/files/drivers/ata/sata_oxnas.c | 256 |
1 files changed, 142 insertions, 114 deletions
diff --git a/target/linux/oxnas/files/drivers/ata/sata_oxnas.c b/target/linux/oxnas/files/drivers/ata/sata_oxnas.c index f8b53f1ef6..39e73d7d18 100644 --- a/target/linux/oxnas/files/drivers/ata/sata_oxnas.c +++ b/target/linux/oxnas/files/drivers/ata/sata_oxnas.c @@ -335,6 +335,8 @@ enum { SATA_SCSI_STACK }; +typedef irqreturn_t (*oxnas_sata_isr_callback_t)(int, unsigned long, int); + struct sata_oxnas_host_priv { void __iomem *port_base; void __iomem *dmactl_base; @@ -353,12 +355,22 @@ struct sata_oxnas_host_priv { struct reset_control *rst_sata; struct reset_control *rst_link; struct reset_control *rst_phy; + spinlock_t phy_lock; + spinlock_t core_lock; + int core_locked; + int reentrant_port_no; + int hw_lock_count; + int direct_lock_count; + void *locker_uid; + int current_locker_type; + int scsi_nonblocking_attempts; + oxnas_sata_isr_callback_t isr_callback; + void *isr_arg; + wait_queue_head_t fast_wait_queue; + wait_queue_head_t scsi_wait_queue; }; -typedef irqreturn_t (*ox820sata_isr_callback_t)(int, unsigned long, int); -static DEFINE_SPINLOCK(oxsphy_lock); -static DEFINE_SPINLOCK(oxsacs_lock); struct sata_oxnas_port_priv { void __iomem *port_base; void __iomem *dmactl_base; @@ -375,22 +387,11 @@ static void sata_oxnas_tf_load(struct ata_port *ap, static void sata_oxnas_irq_on(struct ata_port *ap); static void sata_oxnas_post_reset_init(struct ata_port *ap); -static int sata_oxnas_acquire_hw(int port_no, int may_sleep, - int timeout_jiffies); -static void sata_oxnas_release_hw(unsigned int port_no); +static int sata_oxnas_acquire_hw(struct ata_port *ap, int may_sleep, + int timeout_jiffies); +static void sata_oxnas_release_hw(struct ata_port *ap); -static int core_locked = 0; -static int reentrant_port_no = -1; -static int hw_lock_count = 0; -static int direct_lock_count = 0; -static void *locker_uid = 0; -static int current_locker_type = SATA_UNLOCKED; static const void *HW_LOCKER_UID = (void*)0xdeadbeef; -static DECLARE_WAIT_QUEUE_HEAD(fast_wait_queue); -static DECLARE_WAIT_QUEUE_HEAD(scsi_wait_queue); -static ox820sata_isr_callback_t ox820sata_isr_callback = NULL; -static unsigned long ox820sata_isr_arg = 0; -static int scsi_nonblocking_attempts = 0; /*************************************************************************** * ASIC access @@ -451,14 +452,15 @@ void workaround5458(struct ata_host *ah) */ void sata_oxnas_link_write(struct ata_port *ap, unsigned int link_reg, u32 val) { - struct sata_oxnas_port_priv *port_priv = ap->private_data; - void __iomem *port_base = port_priv->port_base; + struct sata_oxnas_port_priv *pd = ap->private_data; + struct sata_oxnas_host_priv *hd = ap->host->private_data; + void __iomem *port_base = pd->port_base; u32 patience; unsigned long flags; DPRINTK("P%d [0x%02x]->0x%08x\n", ap->port_no, link_reg, val); - spin_lock_irqsave(&oxsphy_lock, flags); + spin_lock_irqsave(&hd->phy_lock, flags); iowrite32(val, port_base + LINK_DATA); /* accessed twice as a work around for a bug in the SATA abp bridge @@ -470,7 +472,7 @@ void sata_oxnas_link_write(struct ata_port *ap, unsigned int link_reg, u32 val) if (ioread32(port_base + LINK_CONTROL) & 0x00000001) break; } - spin_unlock_irqrestore(&oxsphy_lock, flags); + spin_unlock_irqrestore(&hd->phy_lock, flags); } static int sata_oxnas_scr_write_port(struct ata_port *ap, unsigned int sc_reg, @@ -489,12 +491,13 @@ static int sata_oxnas_scr_write(struct ata_link *link, unsigned int sc_reg, u32 sata_oxnas_link_read(struct ata_port *ap, unsigned int link_reg) { struct sata_oxnas_port_priv *pd = ap->private_data; + struct sata_oxnas_host_priv *hd = ap->host->private_data; void __iomem *port_base = pd->port_base; u32 result; u32 patience; unsigned long flags; - spin_lock_irqsave(&oxsphy_lock, flags); + spin_lock_irqsave(&hd->phy_lock, flags); /* accessed twice as a work around for a bug in the SATA abp bridge * hardware (bug 6828) */ iowrite32(link_reg, port_base + LINK_RD_ADDR); @@ -508,7 +511,7 @@ u32 sata_oxnas_link_read(struct ata_port *ap, unsigned int link_reg) DPRINTK("link read timed out for port %d\n", ap->port_no); result = ioread32(port_base + LINK_DATA); - spin_unlock_irqrestore(&oxsphy_lock, flags); + spin_unlock_irqrestore(&hd->phy_lock, flags); return result; } @@ -641,9 +644,10 @@ void sata_oxnas_checkforhotplug(struct ata_port *ap) * sata core. */ static int __acquire_sata_core( + struct ata_host *ah, int port_no, - ox820sata_isr_callback_t callback, - unsigned long arg, + oxnas_sata_isr_callback_t callback, + void *arg, int may_sleep, int timeout_jiffies, int hw_access, @@ -654,33 +658,40 @@ static int __acquire_sata_core( int acquired = 0; unsigned long flags; int timed_out = 0; + struct sata_oxnas_host_priv *hd; + DEFINE_WAIT(wait); - spin_lock_irqsave(&oxsacs_lock, flags); + if (!ah) + return acquired; + + hd = ah->private_data; + + spin_lock_irqsave(&hd->core_lock, flags); DPRINTK("Entered uid %p, port %d, h/w count %d, d count %d, callback %p, " - "hw_access %d, core_locked %d, reentrant_port_no %d, ox820sata_isr_callback %p\n", - uid, port_no, hw_lock_count, direct_lock_count, callback, hw_access, - core_locked, reentrant_port_no, ox820sata_isr_callback); + "hw_access %d, core_locked %d, reentrant_port_no %d, isr_callback %p\n", + uid, port_no, hd->hw_lock_count, hd->direct_lock_count, callback, hw_access, + hd->core_locked, hd->reentrant_port_no, hd->isr_callback); while (!timed_out) { - if (core_locked || (!hw_access && scsi_nonblocking_attempts)) { + if (hd->core_locked || (!hw_access && hd->scsi_nonblocking_attempts)) { /* Can only allow access if from SCSI/SATA stack and if reentrant access is allowed and this access is to the same port for which the lock is current held */ - if (hw_access && (port_no == reentrant_port_no)) { - BUG_ON(!hw_lock_count); - ++hw_lock_count; + if (hw_access && (port_no == hd->reentrant_port_no)) { + BUG_ON(!hd->hw_lock_count); + ++(hd->hw_lock_count); DPRINTK("Allow SCSI/SATA re-entrant access to uid %p port %d\n", uid, port_no); acquired = 1; break; } else if (!hw_access) { - if ((locker_type == SATA_READER) && (current_locker_type == SATA_READER)) { + if ((locker_type == SATA_READER) && (hd->current_locker_type == SATA_READER)) { WARN(1, "Already locked by reader, uid %p, locker_uid %p, port %d, " - "h/w count %d, d count %d, hw_access %d\n", uid, locker_uid, - port_no, hw_lock_count, direct_lock_count, hw_access); + "h/w count %d, d count %d, hw_access %d\n", uid, hd->locker_uid, + port_no, hd->hw_lock_count, hd->direct_lock_count, hw_access); goto check_uid; } @@ -689,52 +700,52 @@ static int __acquire_sata_core( } check_uid: - WARN(uid == locker_uid, "Attempt to lock by locker type %d " + WARN(uid == hd->locker_uid, "Attempt to lock by locker type %d " "uid %p, already locked by locker type %d with " "locker_uid %p, port %d, h/w count %d, d count %d, " - "hw_access %d\n", locker_type, uid, current_locker_type, - locker_uid, port_no, hw_lock_count, direct_lock_count, hw_access); + "hw_access %d\n", locker_type, uid, hd->current_locker_type, + hd->locker_uid, port_no, hd->hw_lock_count, hd->direct_lock_count, hw_access); } } else { - WARN(hw_lock_count || direct_lock_count, "Core unlocked but counts " + WARN(hd->hw_lock_count || hd->direct_lock_count, "Core unlocked but counts " "non-zero: uid %p, locker_uid %p, port %d, h/w count %d, " - "d count %d, hw_access %d\n", uid, locker_uid, port_no, - hw_lock_count, direct_lock_count, hw_access); + "d count %d, hw_access %d\n", uid, hd->locker_uid, port_no, + hd->hw_lock_count, hd->direct_lock_count, hw_access); - BUG_ON(current_locker_type != SATA_UNLOCKED); + BUG_ON(hd->current_locker_type != SATA_UNLOCKED); - WARN(locker_uid, "Attempt to lock uid %p when locker_uid %p is " + WARN(hd->locker_uid, "Attempt to lock uid %p when locker_uid %p is " "non-zero, port %d, h/w count %d, d count %d, hw_access %d\n", - uid, locker_uid, port_no, hw_lock_count, direct_lock_count, + uid, hd->locker_uid, port_no, hd->hw_lock_count, hd->direct_lock_count, hw_access); if (!hw_access) { /* Direct access attempting to acquire non-contented lock */ BUG_ON(!callback); // Must have callback for direct access - BUG_ON(reentrant_port_no != -1); // Sanity check lock state + BUG_ON(hd->reentrant_port_no != -1); // Sanity check lock state - ox820sata_isr_callback = callback; - ox820sata_isr_arg = arg; - ++direct_lock_count; + hd->isr_callback = callback; + hd->isr_arg = arg; + ++(hd->direct_lock_count); - current_locker_type = locker_type; + hd->current_locker_type = locker_type; } else { /* SCSI/SATA attempting to acquire non-contented lock */ BUG_ON(callback); // No callbacks for SCSI/SATA access BUG_ON(arg); // No callback args for SCSI/SATA access - BUG_ON(ox820sata_isr_callback); // Sanity check lock state - BUG_ON(ox820sata_isr_arg); // Sanity check lock state + BUG_ON(hd->isr_callback); // Sanity check lock state + BUG_ON(hd->isr_arg); // Sanity check lock state - ++hw_lock_count; - reentrant_port_no = port_no; + ++(hd->hw_lock_count); + hd->reentrant_port_no = port_no; - current_locker_type = SATA_SCSI_STACK; + hd->current_locker_type = SATA_SCSI_STACK; } - core_locked = 1; + hd->core_locked = 1; + hd->locker_uid = uid; acquired = 1; - locker_uid = uid; break; } @@ -742,10 +753,10 @@ wait_for_lock: if (!may_sleep) { DPRINTK("Denying for uid %p locker_type %d, hw_access %d, port %d, " "current_locker_type %d as cannot sleep\n", uid, locker_type, - hw_access, port_no, current_locker_type); + hw_access, port_no, hd->current_locker_type); if (hw_access) { - ++scsi_nonblocking_attempts; + ++(hd->scsi_nonblocking_attempts); } break; } @@ -753,9 +764,9 @@ wait_for_lock: // Core is locked and we're allowed to sleep, so wait to be awoken when // the core is unlocked for (;;) { - prepare_to_wait(hw_access ? &scsi_wait_queue : &fast_wait_queue, + prepare_to_wait(hw_access ? &hd->scsi_wait_queue : &hd->fast_wait_queue, &wait, TASK_UNINTERRUPTIBLE); - if (!core_locked && !(!hw_access && scsi_nonblocking_attempts)) { + if (!hd->core_locked && !(!hw_access && hd->scsi_nonblocking_attempts)) { // We're going to use variables that will have been changed by // the waker prior to clearing core_locked so we need to ensure // we see changes to all those variables @@ -765,28 +776,28 @@ wait_for_lock: if (time_after(jiffies, end)) { printk("__acquire_sata_core() uid %p failing for port %d timed out, " "locker_uid %p, h/w count %d, d count %d, callback %p, hw_access %d, " - "core_locked %d, reentrant_port_no %d, ox820sata_isr_callback %p, " - "ox820sata_isr_arg %p\n", uid, port_no, locker_uid, - hw_lock_count, direct_lock_count, callback, hw_access, - core_locked, reentrant_port_no, ox820sata_isr_callback, - (void*)ox820sata_isr_arg); + "core_locked %d, reentrant_port_no %d, isr_callback %p, " + "isr_arg %p\n", uid, port_no, hd->locker_uid, + hd->hw_lock_count, hd->direct_lock_count, callback, hw_access, + hd->core_locked, hd->reentrant_port_no, hd->isr_callback, + hd->isr_arg); timed_out = 1; break; } - spin_unlock_irqrestore(&oxsacs_lock, flags); + spin_unlock_irqrestore(&hd->core_lock, flags); if (!schedule_timeout(4*HZ)) { printk(KERN_INFO "__acquire_sata_core() uid %p, locker_uid %p, " "timed-out of schedule(), checking overall timeout\n", - uid, locker_uid); + uid, hd->locker_uid); } - spin_lock_irqsave(&oxsacs_lock, flags); + spin_lock_irqsave(&hd->core_lock, flags); } - finish_wait(hw_access ? &scsi_wait_queue : &fast_wait_queue, &wait); + finish_wait(hw_access ? &hd->scsi_wait_queue : &hd->fast_wait_queue, &wait); } if (hw_access && acquired) { - if (scsi_nonblocking_attempts) { - scsi_nonblocking_attempts = 0; + if (hd->scsi_nonblocking_attempts) { + hd->scsi_nonblocking_attempts = 0; } // Wake any other SCSI/SATA waiters so they can get reentrant access to @@ -794,39 +805,41 @@ wait_for_lock: // locked by fast access, or SCSI/SATA access to other port, then can // have >1 SCSI/SATA waiters on the wait list so want to give reentrant // accessors a chance to get access ASAP - if (!list_empty(&scsi_wait_queue.task_list)) { - wake_up(&scsi_wait_queue); + if (!list_empty(&hd->scsi_wait_queue.task_list)) { + wake_up(&hd->scsi_wait_queue); } } DPRINTK("Leaving uid %p with acquired = %d, port %d, callback %p\n", uid, acquired, port_no, callback); - spin_unlock_irqrestore(&oxsacs_lock, flags); + spin_unlock_irqrestore(&hd->core_lock, flags); return acquired; } -int sata_core_has_fast_waiters(void) +int sata_core_has_fast_waiters(struct ata_host *ah) { int has_waiters; unsigned long flags; + struct sata_oxnas_host_priv *hd = ah->private_data; - spin_lock_irqsave(&oxsacs_lock, flags); - has_waiters = !list_empty(&fast_wait_queue.task_list); - spin_unlock_irqrestore(&oxsacs_lock, flags); + spin_lock_irqsave(&hd->core_lock, flags); + has_waiters = !list_empty(&hd->fast_wait_queue.task_list); + spin_unlock_irqrestore(&hd->core_lock, flags); return has_waiters; } EXPORT_SYMBOL(sata_core_has_fast_waiters); -int sata_core_has_scsi_waiters(void) +int sata_core_has_scsi_waiters(struct ata_host *ah) { int has_waiters; unsigned long flags; + struct sata_oxnas_host_priv *hd = ah->private_data; - spin_lock_irqsave(&oxsacs_lock, flags); - has_waiters = scsi_nonblocking_attempts || !list_empty(&scsi_wait_queue.task_list); - spin_unlock_irqrestore(&oxsacs_lock, flags); + spin_lock_irqsave(&hd->core_lock, flags); + has_waiters = hd->scsi_nonblocking_attempts || !list_empty(&hd->scsi_wait_queue.task_list); + spin_unlock_irqrestore(&hd->core_lock, flags); return has_waiters; } @@ -839,64 +852,65 @@ EXPORT_SYMBOL(sata_core_has_scsi_waiters); * port may be operated on at once. */ static int sata_oxnas_acquire_hw( - int port_no, + struct ata_port *ap, int may_sleep, int timeout_jiffies) { - return __acquire_sata_core(port_no, NULL, 0, may_sleep, timeout_jiffies, 1, (void*)HW_LOCKER_UID, SATA_SCSI_STACK); + return __acquire_sata_core(ap->host, ap->port_no, NULL, 0, may_sleep, timeout_jiffies, 1, (void*)HW_LOCKER_UID, SATA_SCSI_STACK); } /* * operation to release ownership of the SATA hardware */ -static void sata_oxnas_release_hw(unsigned int port_no) +static void sata_oxnas_release_hw(struct ata_port *ap) { unsigned long flags; int released = 0; + struct sata_oxnas_host_priv *hd = ap->host->private_data; - spin_lock_irqsave(&oxsacs_lock, flags); + spin_lock_irqsave(&hd->core_lock, flags); DPRINTK("Entered port_no = %d, h/w count %d, d count %d, core locked = %d, " - "reentrant_port_no = %d, ox820sata_isr_callback %p\n", port_no, - hw_lock_count, direct_lock_count, core_locked, reentrant_port_no, ox820sata_isr_callback); + "reentrant_port_no = %d, isr_callback %p\n", ap->port_no, + hd->hw_lock_count, hd->direct_lock_count, hd->core_locked, hd->reentrant_port_no, hd->isr_callback); - if (!core_locked) { + if (!hd->core_locked) { /* Nobody holds the SATA lock */ - printk(KERN_WARNING "Nobody holds SATA lock, port_no %d\n", port_no); + printk(KERN_WARNING "Nobody holds SATA lock, port_no %d\n", ap->port_no); released = 1; - } else if (!hw_lock_count) { + } else if (!hd->hw_lock_count) { /* SCSI/SATA has released without holding the lock */ - printk(KERN_WARNING "SCSI/SATA does not hold SATA lock, port_no %d\n", port_no); + printk(KERN_WARNING "SCSI/SATA does not hold SATA lock, port_no %d\n", ap->port_no); } else { /* Trap incorrect usage */ - BUG_ON(reentrant_port_no == -1); - BUG_ON(port_no != reentrant_port_no); - BUG_ON(direct_lock_count); - BUG_ON(current_locker_type != SATA_SCSI_STACK); + BUG_ON(hd->reentrant_port_no == -1); + BUG_ON(ap->port_no != hd->reentrant_port_no); + BUG_ON(hd->direct_lock_count); + BUG_ON(hd->current_locker_type != SATA_SCSI_STACK); - WARN(!locker_uid || (locker_uid != HW_LOCKER_UID), "Invalid locker " + WARN(!hd->locker_uid || (hd->locker_uid != HW_LOCKER_UID), "Invalid locker " "uid %p, h/w count %d, d count %d, reentrant_port_no %d, " - "core_locked %d, ox820sata_isr_callback %p\n", locker_uid, - hw_lock_count, direct_lock_count, reentrant_port_no, core_locked, - ox820sata_isr_callback); + "core_locked %d, isr_callback %p\n", hd->locker_uid, + hd->hw_lock_count, hd->direct_lock_count, hd->reentrant_port_no, + hd->core_locked, hd->isr_callback); - if (--hw_lock_count) { - DPRINTK("Still nested port_no %d\n", port_no); + if (--(hd->hw_lock_count)) { + DPRINTK("Still nested port_no %d\n", ap->port_no); } else { - DPRINTK("Release port_no %d\n", port_no); - reentrant_port_no = -1; - ox820sata_isr_callback = NULL; - current_locker_type = SATA_UNLOCKED; - locker_uid = 0; - core_locked = 0; + DPRINTK("Release port_no %d\n", ap->port_no); + hd->reentrant_port_no = -1; + hd->isr_callback = NULL; + hd->current_locker_type = SATA_UNLOCKED; + hd->locker_uid = 0; + hd->core_locked = 0; released = 1; - wake_up(!list_empty(&scsi_wait_queue.task_list) ? &scsi_wait_queue : &fast_wait_queue); + wake_up(!list_empty(&hd->scsi_wait_queue.task_list) ? &hd->scsi_wait_queue : &hd->fast_wait_queue); } } - DPRINTK("Leaving, port_no %d, count %d\n", port_no, hw_lock_count); + DPRINTK("Leaving, port_no %d, count %d\n", ap->port_no, hd->hw_lock_count); - spin_unlock_irqrestore(&oxsacs_lock, flags); + spin_unlock_irqrestore(&hd->core_lock, flags); /* CONFIG_SATA_OX820_DIRECT_HWRAID */ /* if (released) @@ -1468,7 +1482,7 @@ static int sata_oxnas_qc_new(struct ata_port *ap) if (hd->port_frozen || hd->port_in_eh) return 1; else - return !sata_oxnas_acquire_hw(ap->port_no, 0, 0); + return !sata_oxnas_acquire_hw(ap, 0, 0); } /** @@ -1477,7 +1491,7 @@ static int sata_oxnas_qc_new(struct ata_port *ap) static void sata_oxnas_qc_free(struct ata_queued_cmd *qc) { DPRINTK("\n"); - sata_oxnas_release_hw(qc->ap->port_no); + sata_oxnas_release_hw(qc->ap); } static void sata_oxnas_freeze(struct ata_port* ap) @@ -2271,6 +2285,20 @@ static int sata_oxnas_probe(struct platform_device *ofdev) host->private_data = host_priv; host->iomap = port_base; + /* initialize core locking and queues */ + init_waitqueue_head(&host_priv->fast_wait_queue); + init_waitqueue_head(&host_priv->scsi_wait_queue); + spin_lock_init(&host_priv->phy_lock); + spin_lock_init(&host_priv->core_lock); + host_priv->core_locked = 0; + host_priv->reentrant_port_no = -1; + host_priv->hw_lock_count = 0; + host_priv->direct_lock_count = 0; + host_priv->locker_uid = 0; + host_priv->current_locker_type = SATA_UNLOCKED; + host_priv->isr_arg = NULL; + host_priv->isr_callback = NULL; + /* initialize host controller */ retval = sata_oxnas_init_controller(host); if (retval) |