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Message-ID: <4716CC66.8040605@rtr.ca>
Date: Wed, 17 Oct 2007 23:00:54 -0400
From: Mark Lord <lkml@....ca>
To: kristen.c.accardi@...el.com
Cc: Linux Kernel <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Theodore Ts'o <tytso@....edu>, greg@...ah.com,
pcihpd-discuss@...ts.sourceforge.net
Subject: Re: [PATCH 2/3] pciehp_split_pcie_init
02_pciehp_split_pcie_init.patch:
Split out the hotplug hardware initialization code from pcie_init()
into pcie_init_enable_events(), without changing any functionality.
Signed-off-by: Mark Lord <mlord@...ox.com>
---
--- git12/drivers/pci/hotplug/pciehp_hpc.c 2007-10-17 19:06:38.000000000 -0400
+++ linux/drivers/pci/hotplug/pciehp_hpc.c 2007-10-17 19:29:42.000000000 -0400
@@ -1067,99 +1067,22 @@
}
#endif
-int pcie_init(struct controller * ctrl, struct pcie_device *dev)
+int pcie_init_hardware(struct controller *ctrl, struct pcie_device *dev)
{
int rc;
u16 temp_word;
- u16 cap_reg;
u16 intr_enable = 0;
u32 slot_cap;
- int cap_base;
- u16 slot_status, slot_ctrl;
+ u16 slot_status;
struct pci_dev *pdev;
pdev = dev->port;
- ctrl->pci_dev = pdev; /* save pci_dev in context */
-
- dbg("%s: hotplug controller vendor id 0x%x device id 0x%x\n",
- __FUNCTION__, pdev->vendor, pdev->device);
-
- if ((cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP)) == 0) {
- dbg("%s: Can't find PCI_CAP_ID_EXP (0x10)\n", __FUNCTION__);
- goto abort_free_ctlr;
- }
-
- ctrl->cap_base = cap_base;
-
- dbg("%s: pcie_cap_base %x\n", __FUNCTION__, cap_base);
-
- rc = pciehp_readw(ctrl, CAPREG, &cap_reg);
- if (rc) {
- err("%s: Cannot read CAPREG register\n", __FUNCTION__);
- goto abort_free_ctlr;
- }
- dbg("%s: CAPREG offset %x cap_reg %x\n",
- __FUNCTION__, ctrl->cap_base + CAPREG, cap_reg);
-
- if (((cap_reg & SLOT_IMPL) == 0) ||
- (((cap_reg & DEV_PORT_TYPE) != 0x0040)
- && ((cap_reg & DEV_PORT_TYPE) != 0x0060))) {
- dbg("%s : This is not a root port or the port is not "
- "connected to a slot\n", __FUNCTION__);
- goto abort_free_ctlr;
- }
rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap);
if (rc) {
err("%s: Cannot read SLOTCAP register\n", __FUNCTION__);
goto abort_free_ctlr;
}
- dbg("%s: SLOTCAP offset %x slot_cap %x\n",
- __FUNCTION__, ctrl->cap_base + SLOTCAP, slot_cap);
-
- if (!(slot_cap & HP_CAP)) {
- dbg("%s : This slot is not hot-plug capable\n", __FUNCTION__);
- goto abort_free_ctlr;
- }
- /* For debugging purpose */
- rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
- if (rc) {
- err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
- goto abort_free_ctlr;
- }
- dbg("%s: SLOTSTATUS offset %x slot_status %x\n",
- __FUNCTION__, ctrl->cap_base + SLOTSTATUS, slot_status);
-
- rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
- if (rc) {
- err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
- goto abort_free_ctlr;
- }
- dbg("%s: SLOTCTRL offset %x slot_ctrl %x\n",
- __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
-
- for (rc = 0; rc < DEVICE_COUNT_RESOURCE; rc++)
- if (pci_resource_len(pdev, rc) > 0)
- dbg("pci resource[%d] start=0x%llx(len=0x%llx)\n", rc,
- (unsigned long long)pci_resource_start(pdev, rc),
- (unsigned long long)pci_resource_len(pdev, rc));
-
- 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);
-
- mutex_init(&ctrl->crit_sect);
- mutex_init(&ctrl->ctrl_lock);
- spin_lock_init(&ctrl->lock);
-
- /* setup wait queue */
- init_waitqueue_head(&ctrl->queue);
-
- /* return PCI Controller Info */
- ctrl->slot_device_offset = 0;
- ctrl->num_slots = 1;
- ctrl->first_slot = slot_cap >> 19;
- ctrl->ctrlcap = slot_cap & 0x0000007f;
/* Mask Hot-plug Interrupt Enable */
rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
@@ -1280,8 +1203,6 @@
goto abort_disable_intr;
}
- ctrl->hpc_ops = &pciehp_hpc_ops;
-
return 0;
/* We end up here for the many possible ways to fail this API. */
@@ -1303,3 +1224,105 @@
abort_free_ctlr:
return -1;
}
+
+int pcie_init(struct controller *ctrl, struct pcie_device *dev)
+{
+ int rc;
+ u16 cap_reg;
+ u32 slot_cap;
+ int cap_base;
+ u16 slot_status, slot_ctrl;
+ struct pci_dev *pdev;
+
+ pdev = dev->port;
+ ctrl->pci_dev = pdev; /* save pci_dev in context */
+
+ dbg("%s: hotplug controller vendor id 0x%x device id 0x%x\n",
+ __FUNCTION__, pdev->vendor, pdev->device);
+
+ cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
+ if (cap_base == 0) {
+ dbg("%s: Can't find PCI_CAP_ID_EXP (0x10)\n", __FUNCTION__);
+ goto abort;
+ }
+
+ ctrl->cap_base = cap_base;
+
+ dbg("%s: pcie_cap_base %x\n", __FUNCTION__, cap_base);
+
+ rc = pciehp_readw(ctrl, CAPREG, &cap_reg);
+ if (rc) {
+ err("%s: Cannot read CAPREG register\n", __FUNCTION__);
+ goto abort;
+ }
+ dbg("%s: CAPREG offset %x cap_reg %x\n",
+ __FUNCTION__, ctrl->cap_base + CAPREG, cap_reg);
+
+ if (((cap_reg & SLOT_IMPL) == 0) ||
+ (((cap_reg & DEV_PORT_TYPE) != 0x0040)
+ && ((cap_reg & DEV_PORT_TYPE) != 0x0060))) {
+ dbg("%s : This is not a root port or the port is not "
+ "connected to a slot\n", __FUNCTION__);
+ goto abort;
+ }
+
+ rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap);
+ if (rc) {
+ err("%s: Cannot read SLOTCAP register\n", __FUNCTION__);
+ goto abort;
+ }
+ dbg("%s: SLOTCAP offset %x slot_cap %x\n",
+ __FUNCTION__, ctrl->cap_base + SLOTCAP, slot_cap);
+
+ if (!(slot_cap & HP_CAP)) {
+ dbg("%s : This slot is not hot-plug capable\n", __FUNCTION__);
+ goto abort;
+ }
+ /* For debugging purpose */
+ rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
+ if (rc) {
+ err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
+ goto abort;
+ }
+ dbg("%s: SLOTSTATUS offset %x slot_status %x\n",
+ __FUNCTION__, ctrl->cap_base + SLOTSTATUS, slot_status);
+
+ rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
+ if (rc) {
+ err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
+ goto abort;
+ }
+ dbg("%s: SLOTCTRL offset %x slot_ctrl %x\n",
+ __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
+
+ for (rc = 0; rc < DEVICE_COUNT_RESOURCE; rc++)
+ if (pci_resource_len(pdev, rc) > 0)
+ dbg("pci resource[%d] start=0x%llx(len=0x%llx)\n", rc,
+ (unsigned long long)pci_resource_start(pdev, rc),
+ (unsigned long long)pci_resource_len(pdev, rc));
+
+ 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);
+
+ mutex_init(&ctrl->crit_sect);
+ mutex_init(&ctrl->ctrl_lock);
+ spin_lock_init(&ctrl->lock);
+
+ /* setup wait queue */
+ init_waitqueue_head(&ctrl->queue);
+
+ /* return PCI Controller Info */
+ ctrl->slot_device_offset = 0;
+ ctrl->num_slots = 1;
+ ctrl->first_slot = slot_cap >> 19;
+ ctrl->ctrlcap = slot_cap & 0x0000007f;
+
+ rc = pcie_init_hardware(ctrl, dev);
+ if (rc == 0) {
+ ctrl->hpc_ops = &pciehp_hpc_ops;
+ return 0;
+ }
+abort:
+ return -1;
+}
-
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