1 files changed, 137 insertions, 181 deletions

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 79f1049..1323a43 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -247,30 +247,32 @@ static inline void pciehp_free_irq(struct controller *ctrl)
 		free_irq(ctrl->pci_dev->irq, ctrl);
 }
 
-static inline int pcie_poll_cmd(struct controller *ctrl)
+static int pcie_poll_cmd(struct controller *ctrl)
 {
 	u16 slot_status;
 	int timeout = 1000;
 
-	if (!pciehp_readw(ctrl, SLOTSTATUS, &slot_status))
-		if (slot_status & CMD_COMPLETED)
-			goto completed;
-	for (timeout = 1000; timeout > 0; timeout -= 100) {
-		msleep(100);
-		if (!pciehp_readw(ctrl, SLOTSTATUS, &slot_status))
-			if (slot_status & CMD_COMPLETED)
-				goto completed;
+	if (!pciehp_readw(ctrl, SLOTSTATUS, &slot_status)) {
+		if (slot_status & CMD_COMPLETED) {
+			pciehp_writew(ctrl, SLOTSTATUS, CMD_COMPLETED);
+			return 1;
+		}
+	}
+	while (timeout > 1000) {
+		msleep(10);
+		timeout -= 10;
+		if (!pciehp_readw(ctrl, SLOTSTATUS, &slot_status)) {
+			if (slot_status & CMD_COMPLETED) {
+				pciehp_writew(ctrl, SLOTSTATUS, CMD_COMPLETED);
+				return 1;
+			}
+		}
 	}
 	return 0;	/* timeout */
-
-completed:
-	pciehp_writew(ctrl, SLOTSTATUS, CMD_COMPLETED);
-	return timeout;
 }
 
-static inline int pcie_wait_cmd(struct controller *ctrl, int poll)
+static void pcie_wait_cmd(struct controller *ctrl, int poll)
 {
-	int retval = 0;
 	unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
 	unsigned long timeout = msecs_to_jiffies(msecs);
 	int rc;
@@ -278,16 +280,9 @@ static inline int pcie_wait_cmd(struct controller *ctrl, int poll)
 	if (poll)
 		rc = pcie_poll_cmd(ctrl);
 	else
-		rc = wait_event_interruptible_timeout(ctrl->queue,
-					      !ctrl->cmd_busy, timeout);
+		rc = wait_event_timeout(ctrl->queue, !ctrl->cmd_busy, timeout);
 	if (!rc)
 		dbg("Command not completed in 1000 msec\n");
-	else if (rc < 0) {
-		retval = -EINTR;
-		info("Command was interrupted by a signal\n");
-	}
-
-	return retval;
 }
 
 /**
@@ -342,10 +337,6 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
 
 	slot_ctrl &= ~mask;
 	slot_ctrl |= (cmd & mask);
-	/* Don't enable command completed if caller is changing it. */
-	if (!(mask & CMD_CMPL_INTR_ENABLE))
-		slot_ctrl |= CMD_CMPL_INTR_ENABLE;
-
 	ctrl->cmd_busy = 1;
 	smp_mb();
 	retval = pciehp_writew(ctrl, SLOTCTRL, slot_ctrl);
@@ -365,7 +356,7 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
 		if (!(slot_ctrl & HP_INTR_ENABLE) ||
 		    !(slot_ctrl & CMD_CMPL_INTR_ENABLE))
 			poll = 1;
-                retval = pcie_wait_cmd(ctrl, poll);
+                pcie_wait_cmd(ctrl, poll);
 	}
  out:
 	mutex_unlock(&ctrl->ctrl_lock);
@@ -614,23 +605,6 @@ static void hpc_set_green_led_blink(struct slot *slot)
 	    __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
 }
 
-static void hpc_release_ctlr(struct controller *ctrl)
-{
-	/* Mask Hot-plug Interrupt Enable */
-	if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE))
-		err("%s: Cannot mask hotplut interrupt enable\n", __func__);
-
-	/* Free interrupt handler or interrupt polling timer */
-	pciehp_free_irq(ctrl);
-
-	/*
-	 * If this is the last controller to be released, destroy the
-	 * pciehp work queue
-	 */
-	if (atomic_dec_and_test(&pciehp_num_controllers))
-		destroy_workqueue(pciehp_wq);
-}
-
 static int hpc_power_on_slot(struct slot * slot)
 {
 	struct controller *ctrl = slot->ctrl;
@@ -785,7 +759,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
 		intr_loc |= detected;
 		if (!intr_loc)
 			return IRQ_NONE;
-		if (pciehp_writew(ctrl, SLOTSTATUS, detected)) {
+		if (detected && pciehp_writew(ctrl, SLOTSTATUS, detected)) {
 			err("%s: Cannot write to SLOTSTATUS\n", __func__);
 			return IRQ_NONE;
 		}
@@ -797,25 +771,13 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
 	if (intr_loc & CMD_COMPLETED) {
 		ctrl->cmd_busy = 0;
 		smp_mb();
-		wake_up_interruptible(&ctrl->queue);
+		wake_up(&ctrl->queue);
 	}
 
 	if (!(intr_loc & ~CMD_COMPLETED))
 		return IRQ_HANDLED;
 
-	/*
-	 * Return without handling events if this handler routine is
-	 * called before controller initialization is done. This may
-	 * happen if hotplug event or another interrupt that shares
-	 * the IRQ with pciehp arrives before slot initialization is
-	 * done after interrupt handler is registered.
-	 *
-	 * FIXME - Need more structural fixes. We need to be ready to
-	 * handle the event before installing interrupt handler.
-	 */
 	p_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
-	if (!p_slot || !p_slot->hpc_ops)
-		return IRQ_HANDLED;
 
 	/* Check MRL Sensor Changed */
 	if (intr_loc & MRL_SENS_CHANGED)
@@ -992,6 +954,7 @@ static int hpc_get_cur_lnk_width(struct slot *slot,
 	return retval;
 }
 
+static void pcie_release_ctrl(struct controller *ctrl);
 static struct hpc_ops pciehp_hpc_ops = {
 	.power_on_slot			= hpc_power_on_slot,
 	.power_off_slot			= hpc_power_off_slot,
@@ -1013,97 +976,11 @@ static struct hpc_ops pciehp_hpc_ops = {
 	.green_led_off			= hpc_set_green_led_off,
 	.green_led_blink		= hpc_set_green_led_blink,
 
-	.release_ctlr			= hpc_release_ctlr,
+	.release_ctlr			= pcie_release_ctrl,
 	.check_lnk_status		= hpc_check_lnk_status,
 };
 
-#ifdef CONFIG_ACPI
-static int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
-{
-	acpi_status status;
-	acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
-	struct pci_dev *pdev = dev;
-	struct pci_bus *parent;
-	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
-
-	/*
-	 * Per PCI firmware specification, we should run the ACPI _OSC
-	 * method to get control of hotplug hardware before using it.
-	 * If an _OSC is missing, we look for an OSHP to do the same thing.
-	 * To handle different BIOS behavior, we look for _OSC and OSHP
-	 * within the scope of the hotplug controller and its parents, upto
-	 * the host bridge under which this controller exists.
-	 */
-	while (!handle) {
-		/*
-		 * This hotplug controller was not listed in the ACPI name
-		 * space at all. Try to get acpi handle of parent pci bus.
-		 */
-		if (!pdev || !pdev->bus->parent)
-			break;
-		parent = pdev->bus->parent;
-		dbg("Could not find %s in acpi namespace, trying parent\n",
-				pci_name(pdev));
-		if (!parent->self)
-			/* Parent must be a host bridge */
-			handle = acpi_get_pci_rootbridge_handle(
-					pci_domain_nr(parent),
-					parent->number);
-		else
-			handle = DEVICE_ACPI_HANDLE(
-					&(parent->self->dev));
-		pdev = parent->self;
-	}
-
-	while (handle) {
-		acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
-		dbg("Trying to get hotplug control for %s \n",
-			(char *)string.pointer);
-		status = pci_osc_control_set(handle,
-				OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL |
-				OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
-		if (status == AE_NOT_FOUND)
-			status = acpi_run_oshp(handle);
-		if (ACPI_SUCCESS(status)) {
-			dbg("Gained control for hotplug HW for pci %s (%s)\n",
-				pci_name(dev), (char *)string.pointer);
-			kfree(string.pointer);
-			return 0;
-		}
-		if (acpi_root_bridge(handle))
-			break;
-		chandle = handle;
-		status = acpi_get_parent(chandle, &handle);
-		if (ACPI_FAILURE(status))
-			break;
-	}
-
-	dbg("Cannot get control of hotplug hardware for pci %s\n",
-			pci_name(dev));
-
-	kfree(string.pointer);
-	return -1;
-}
-#endif
-
-static int pcie_init_hardware_part1(struct controller *ctrl,
-				    struct pcie_device *dev)
-{
-	/* Clear all remaining event bits in Slot Status register */
-	if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
-		err("%s: Cannot write to SLOTSTATUS register\n", __func__);
-		return -1;
-	}
-
-	/* Mask Hot-plug Interrupt Enable */
-	if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE)) {
-		err("%s: Cannot mask hotplug interrupt enable\n", __func__);
-		return -1;
-	}
-	return 0;
-}
-
-int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
+int pcie_enable_notification(struct controller *ctrl)
 {
 	u16 cmd, mask;
 
@@ -1115,30 +992,83 @@ int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
 	if (MRL_SENS(ctrl))
 		cmd |= MRL_DETECT_ENABLE;
 	if (!pciehp_poll_mode)
-		cmd |= HP_INTR_ENABLE;
+		cmd |= HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE;
 
-	mask = PRSN_DETECT_ENABLE | ATTN_BUTTN_ENABLE |
-		PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE | HP_INTR_ENABLE;
+	mask = PRSN_DETECT_ENABLE | ATTN_BUTTN_ENABLE | MRL_DETECT_ENABLE |
+	       PWR_FAULT_DETECT_ENABLE | HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE;
 
 	if (pcie_write_cmd(ctrl, cmd, mask)) {
 		err("%s: Cannot enable software notification\n", __func__);
-		goto abort;
+		return -1;
 	}
+	return 0;
+}
 
-	if (pciehp_force)
-		dbg("Bypassing BIOS check for pciehp use on %s\n",
-				pci_name(ctrl->pci_dev));
-	else if (pciehp_get_hp_hw_control_from_firmware(ctrl->pci_dev))
-		goto abort_disable_intr;
+static void pcie_disable_notification(struct controller *ctrl)
+{
+	u16 mask;
+	mask = PRSN_DETECT_ENABLE | ATTN_BUTTN_ENABLE | MRL_DETECT_ENABLE |
+	       PWR_FAULT_DETECT_ENABLE | HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE;
+	if (pcie_write_cmd(ctrl, 0, mask))
+		warn("%s: Cannot disable software notification\n", __func__);
+}
 
+static int pcie_init_notification(struct controller *ctrl)
+{
+	if (pciehp_request_irq(ctrl))
+		return -1;
+	if (pcie_enable_notification(ctrl)) {
+		pciehp_free_irq(ctrl);
+		return -1;
+	}
 	return 0;
+}
 
-	/* We end up here for the many possible ways to fail this API. */
-abort_disable_intr:
-	if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE))
-		err("%s : disabling interrupts failed\n", __func__);
-abort:
-	return -1;
+static void pcie_shutdown_notification(struct controller *ctrl)
+{
+	pcie_disable_notification(ctrl);
+	pciehp_free_irq(ctrl);
+}
+
+static void make_slot_name(struct slot *slot)
+{
+	if (pciehp_slot_with_bus)
+		snprintf(slot->name, SLOT_NAME_SIZE, "%04d_%04d",
+			 slot->bus, slot->number);
+	else
+		snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
+}
+
+static int pcie_init_slot(struct controller *ctrl)
+{
+	struct slot *slot;
+
+	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
+	if (!slot)
+		return -ENOMEM;
+
+	slot->hp_slot = 0;
+	slot->ctrl = ctrl;
+	slot->bus = ctrl->pci_dev->subordinate->number;
+	slot->device = ctrl->slot_device_offset + slot->hp_slot;
+	slot->hpc_ops = ctrl->hpc_ops;
+	slot->number = ctrl->first_slot;
+	make_slot_name(slot);
+	mutex_init(&slot->lock);
+	INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
+	list_add(&slot->slot_list, &ctrl->slot_list);
+	return 0;
+}
+
+static void pcie_cleanup_slot(struct controller *ctrl)
+{
+	struct slot *slot;
+	slot = list_first_entry(&ctrl->slot_list, struct slot, slot_list);
+	list_del(&slot->slot_list);
+	cancel_delayed_work(&slot->work);
+	flush_scheduled_work();
+	flush_workqueue(pciehp_wq);
+	kfree(slot);
 }
 
 static inline void dbg_ctrl(struct controller *ctrl)
@@ -1176,15 +1106,23 @@ static inline void dbg_ctrl(struct controller *ctrl)
 	dbg("  Comamnd Completed    : %3s\n", NO_CMD_CMPL(ctrl)? "no" : "yes");
 	pciehp_readw(ctrl, SLOTSTATUS, &reg16);
 	dbg("Slot Status            : 0x%04x\n", reg16);
-	pciehp_readw(ctrl, SLOTSTATUS, &reg16);
+	pciehp_readw(ctrl, SLOTCTRL, &reg16);
 	dbg("Slot Control           : 0x%04x\n", reg16);
 }
 
-int pcie_init(struct controller *ctrl, struct pcie_device *dev)
+struct controller *pcie_init(struct pcie_device *dev)
 {
+	struct controller *ctrl;
 	u32 slot_cap;
 	struct pci_dev *pdev = dev->port;
 
+	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+	if (!ctrl) {
+		err("%s : out of memory\n", __func__);
+		goto abort;
+	}
+	INIT_LIST_HEAD(&ctrl->slot_list);
+
 	ctrl->pci_dev = pdev;
 	ctrl->cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
 	if (!ctrl->cap_base) {
@@ -1215,15 +1153,12 @@ int pcie_init(struct controller *ctrl, struct pcie_device *dev)
 	    !(POWER_CTRL(ctrl) | ATTN_LED(ctrl) | PWR_LED(ctrl) | EMI(ctrl)))
 	    ctrl->no_cmd_complete = 1;
 
-	info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
-	     pdev->vendor, pdev->device,
-	     pdev->subsystem_vendor, pdev->subsystem_device);
+	/* Clear all remaining event bits in Slot Status register */
+	if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f))
+		goto abort_ctrl;
 
-	if (pcie_init_hardware_part1(ctrl, dev))
-		goto abort;
-
-	if (pciehp_request_irq(ctrl))
-		goto abort;
+	/* Disable sotfware notification */
+	pcie_disable_notification(ctrl);
 
 	/*
 	 * If this is the first controller to be initialized,
@@ -1231,18 +1166,39 @@ int pcie_init(struct controller *ctrl, struct pcie_device *dev)
 	 */
 	if (atomic_add_return(1, &pciehp_num_controllers) == 1) {
 		pciehp_wq = create_singlethread_workqueue("pciehpd");
-		if (!pciehp_wq) {
-			goto abort_free_irq;
-		}
+		if (!pciehp_wq)
+			goto abort_ctrl;
 	}
 
-	if (pcie_init_hardware_part2(ctrl, dev))
-		goto abort_free_irq;
+	info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
+	     pdev->vendor, pdev->device,
+	     pdev->subsystem_vendor, pdev->subsystem_device);
+
+	if (pcie_init_slot(ctrl))
+		goto abort_ctrl;
 
-	return 0;
+	if (pcie_init_notification(ctrl))
+		goto abort_slot;
 
-abort_free_irq:
-	pciehp_free_irq(ctrl);
+	return ctrl;
+
+abort_slot:
+	pcie_cleanup_slot(ctrl);
+abort_ctrl:
+	kfree(ctrl);
 abort:
-	return -1;
+	return NULL;
+}
+
+void pcie_release_ctrl(struct controller *ctrl)
+{
+	pcie_shutdown_notification(ctrl);
+	pcie_cleanup_slot(ctrl);
+	/*
+	 * If this is the last controller to be released, destroy the
+	 * pciehp work queue
+	 */
+	if (atomic_dec_and_test(&pciehp_num_controllers))
+		destroy_workqueue(pciehp_wq);
+	kfree(ctrl);
 }