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Date: Mon, 14 Sep 2015 11:08:58 +0800
From: Jiang Liu <jiang.liu@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Arthur Marsh <arthur.marsh@...ernode.on.net>,
Dario Ballabio <ballabio_dario@....com>,
"James E.J. Bottomley" <JBottomley@...n.com>
Cc: Jiang Liu <jiang.liu@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-scsi@...r.kernel.org, x86@...nel.org
Subject: [Bugfix 2/3] eata: Implement PCI driver to manage eata PCI devices
Previously the eata driver just grabs and accesses eata PCI devices
without implementing a PCI device driver, that causes troubles with
latest IRQ related
Commit 991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and
pcibios_free_irq()") changes the way to allocate PCI legacy IRQ
for PCI devices on x86 platforms. Instead of allocating PCI legacy
IRQs when pcibios_enable_device() gets called, now pcibios_alloc_irq()
will be called by pci_device_probe() to allocate PCI legacy IRQs
when binding PCI drivers to PCI devices.
But the eata driver directly accesses PCI devices without implementing
corresponding PCI drivers, so pcibios_alloc_irq() won't be called for
those PCI devices and wrong IRQ number may be used to manage the PCI
device.
This patch implements a PCI device driver to manage eata PCI devices,
so eata driver could properly cooperate with the PCI core. It also
provides headroom for PCI hotplug with eata driver.
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
drivers/scsi/eata.c | 170 ++++++++++++++++++++++-----------------------------
1 file changed, 74 insertions(+), 96 deletions(-)
diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index b45d3b532b70..b92e6856f909 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -850,10 +850,6 @@ static unsigned long io_port[] = {
/* First ISA */
0x1f0,
- /* Space for MAX_PCI ports possibly reported by PCI_BIOS */
- SKIP, SKIP, SKIP, SKIP, SKIP, SKIP, SKIP, SKIP,
- SKIP, SKIP, SKIP, SKIP, SKIP, SKIP, SKIP, SKIP,
-
/* MAX_EISA ports */
0x1c88, 0x2c88, 0x3c88, 0x4c88, 0x5c88, 0x6c88, 0x7c88, 0x8c88,
0x9c88, 0xac88, 0xbc88, 0xcc88, 0xdc88, 0xec88, 0xfc88,
@@ -1024,60 +1020,13 @@ static int read_pio(unsigned long iobase, ushort * start, ushort * end)
return 0;
}
-static struct pci_dev *get_pci_dev(unsigned long port_base)
-{
-#if defined(CONFIG_PCI)
- unsigned int addr;
- struct pci_dev *dev = NULL;
-
- while ((dev = pci_get_class(PCI_CLASS_STORAGE_SCSI << 8, dev))) {
- addr = pci_resource_start(dev, 0);
-
-#if defined(DEBUG_PCI_DETECT)
- printk("%s: get_pci_dev, bus %d, devfn 0x%x, addr 0x%x.\n",
- driver_name, dev->bus->number, dev->devfn, addr);
-#endif
-
- /* we are in so much trouble for a pci hotplug system with this driver
- * anyway, so doing this at least lets people unload the driver and not
- * cause memory problems, but in general this is a bad thing to do (this
- * driver needs to be converted to the proper PCI api someday... */
- pci_dev_put(dev);
- if (addr + PCI_BASE_ADDRESS_0 == port_base)
- return dev;
- }
-#endif /* end CONFIG_PCI */
- return NULL;
-}
-
-static void enable_pci_ports(void)
-{
-#if defined(CONFIG_PCI)
- struct pci_dev *dev = NULL;
-
- while ((dev = pci_get_class(PCI_CLASS_STORAGE_SCSI << 8, dev))) {
-#if defined(DEBUG_PCI_DETECT)
- printk("%s: enable_pci_ports, bus %d, devfn 0x%x.\n",
- driver_name, dev->bus->number, dev->devfn);
-#endif
-
- if (pci_enable_device(dev))
- printk
- ("%s: warning, pci_enable_device failed, bus %d devfn 0x%x.\n",
- driver_name, dev->bus->number, dev->devfn);
- }
-
-#endif /* end CONFIG_PCI */
-}
-
static int port_detect(unsigned long port_base, unsigned int j,
- struct scsi_host_template *tpnt)
+ struct scsi_host_template *tpnt, struct pci_dev *pdev)
{
unsigned char irq, dma_channel, subversion, i, is_pci = 0;
unsigned char protocol_rev;
struct eata_info info;
char *bus_type, dma_name[16];
- struct pci_dev *pdev;
/* Allowed DMA channels for ISA (0 indicates reserved) */
unsigned char dma_channel_table[4] = { 5, 6, 7, 0 };
struct Scsi_Host *shost;
@@ -1199,15 +1148,8 @@ static int port_detect(unsigned long port_base, unsigned int j,
("%s: warning, LEVEL triggering is suggested for IRQ %u.\n",
name, irq);
- if (is_pci) {
- pdev = get_pci_dev(port_base);
- if (!pdev)
- printk
- ("%s: warning, failed to get pci_dev structure.\n",
- name);
- } else
- pdev = NULL;
-
+ if (is_pci && !pdev)
+ printk("%s: warning, failed to get pci_dev structure.\n", name);
if (pdev && (irq != pdev->irq)) {
printk("%s: IRQ %u mapped to IO-APIC IRQ %u.\n", name, irq,
pdev->irq);
@@ -1510,14 +1452,17 @@ static int option_setup(char *str)
}
static unsigned int port_probe(unsigned long port_base,
- struct scsi_host_template *tpnt)
+ struct scsi_host_template *tpnt,
+ struct pci_dev *pdev)
{
int id;
id = ida_simple_get(&eata_ida, 0, MAX_BOARDS, GFP_KERNEL);
if (id >= 0) {
set_bit(id, eata_board_bitmap);
- if (port_detect(port_base, id, tpnt))
+ if (pdev)
+ dev_set_drvdata(&pdev->dev, (void *)(long)id);
+ if (port_detect(port_base, id, tpnt, pdev))
return id;
clear_bit(id, eata_board_bitmap);
ida_simple_remove(&eata_ida, id);
@@ -1526,42 +1471,81 @@ static unsigned int port_probe(unsigned long port_base,
return -1;
}
-static void add_pci_ports(void)
-{
-#if defined(CONFIG_PCI)
- unsigned int addr, k;
- struct pci_dev *dev = NULL;
-
- for (k = 0; k < MAX_PCI; k++) {
+#ifdef CONFIG_PCI
+static int eata2x_pci_device_count;
- if (!(dev = pci_get_class(PCI_CLASS_STORAGE_SCSI << 8, dev)))
- break;
+static int eata2x_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ int i, ret = -ENXIO;
+ resource_size_t addr;
+ unsigned long port_base;
+ struct scsi_host_template *tpnt = (void *)id->driver_data;
- if (pci_enable_device(dev)) {
+ if (pci_enable_device(dev)) {
#if defined(DEBUG_PCI_DETECT)
- printk
- ("%s: detect, bus %d, devfn 0x%x, pci_enable_device failed.\n",
- driver_name, dev->bus->number, dev->devfn);
+ pr_warn("%s: detect, bus %d, devfn 0x%x, pci_enable_device failed.\n",
+ driver_name, dev->bus->number, dev->devfn);
#endif
+ goto out_error;
+ }
- continue;
- }
-
- addr = pci_resource_start(dev, 0);
-
+ addr = pci_resource_start(dev, 0);
+ port_base = addr + PCI_BASE_ADDRESS_0;
#if defined(DEBUG_PCI_DETECT)
- printk("%s: detect, seq. %d, bus %d, devfn 0x%x, addr 0x%x.\n",
- driver_name, k, dev->bus->number, dev->devfn, addr);
+ printk("%s: detect, bus %d, devfn 0x%x, addr 0x%x.\n",
+ driver_name, dev->bus->number, dev->devfn, (unsigned int)addr);
#endif
- /* Order addresses according to rev_scan value */
- io_port[MAX_INT_PARAM + (rev_scan ? (MAX_PCI - k) : (1 + k))] =
- addr + PCI_BASE_ADDRESS_0;
+ if (setup_done) {
+ /*
+ * Handle kernel or module parameter
+ * . probe board if its port is specified by user
+ * . otherwise ignore the board
+ */
+ for (i = 1; i < MAX_INT_PARAM; i++)
+ if (io_port[i] == port_base) {
+ io_port[i] = SKIP;
+ break;
+ }
+ if (i >= MAX_INT_PARAM)
+ goto out_disable_device;
+ }
+ if (port_probe(port_base, tpnt, dev) >= 0) {
+ eata2x_pci_device_count++;
+ return 0;
}
- pci_dev_put(dev);
-#endif /* end CONFIG_PCI */
+out_disable_device:
+ pci_disable_device(dev);
+out_error:
+ return ret;
+}
+
+static struct pci_device_id eata2x_tbl[] = {
+ { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_SCSI << 8, PCI_ANY_ID) },
+ { },
+};
+MODULE_DEVICE_TABLE(pci, eata2x_tbl);
+
+static struct pci_driver eata2x_pci_driver = {
+ .name = "eata",
+ .id_table = eata2x_tbl,
+ .probe = eata2x_pci_probe,
+};
+
+static int eata2x_probe_pci_devices(struct scsi_host_template *tpnt)
+{
+ eata2x_tbl[0].driver_data = (kernel_ulong_t)tpnt;
+ if (pci_probe && pci_register_driver(&eata2x_pci_driver))
+ pr_warn("eata2x: failed to register PCI device driver.\n");
+ return eata2x_pci_device_count;
+}
+#else /* CONFIG_PCI */
+static inline int eata2x_probe_pci_devices(struct scsi_host_template *tpnt)
+{
+ return 0;
}
+#endif /* CONFIG_PCI */
static int eata2x_detect(struct scsi_host_template *tpnt)
{
@@ -1592,16 +1576,10 @@ static int eata2x_detect(struct scsi_host_template *tpnt)
io_port[k] = SKIP;
}
- if (pci_probe) {
- if (!setup_done)
- add_pci_ports();
- else
- enable_pci_ports();
- }
-
+ count += eata2x_probe_pci_devices(tpnt);
for (k = 0; io_port[k]; k++)
if (io_port[k] != SKIP &&
- port_probe(io_port[k], tpnt) >= 0)
+ port_probe(io_port[k], tpnt, NULL) >= 0)
count++;
return count;
--
1.7.10.4
--
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