[PATCH] PCI legacy I/O port free driver - Making Intel e1000 driverlegacy I/O port free

From: Tomohiro Kusumi
Date: Thu May 10 2007 - 06:05:34 EST

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Hi

As you can see in the "10. pci_enable_device_bars() and Legacy I/O
Port space" of the Documentation/pci.txt, the latest kernel has
interfaces for PCI device drivers to tell the kernel which resource
the driver want to use, ex. I/O port or MMIO.

I've made a patch which makes Intel e1000 driver legacy I/O port
free by using the PCI core changes I mentioned above. The Intel
e1000 driver can handle some of its devices without using I/O port.
So this patch changes the driver not to enable/request I/O port
region depending on the device id.

As a result, the driver can handle its device even when there are
huge number of PCI devices being used on the system and no I/O
port region assigned to the device.

Tomohiro Kusumi

Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@xxxxxxxxxxxxxx>

---
e1000.h | 6 +-
e1000_main.c | 152 +++++++++++++++++++++++++++++++----------------------------
2 files changed, 86 insertions(+), 72 deletions(-)

diff -uprN linux-2.6.21.orig/drivers/net/e1000/e1000.h linux-2.6.21/drivers/net/e1000/e1000.h
--- linux-2.6.21.orig/drivers/net/e1000/e1000.h 2007-05-09 18:02:26.000000000 +0900
+++ linux-2.6.21/drivers/net/e1000/e1000.h 2007-05-09 18:02:59.000000000 +0900
@@ -74,8 +74,9 @@
#define BAR_1 1
#define BAR_5 5

-#define INTEL_E1000_ETHERNET_DEVICE(device_id) {\
- PCI_DEVICE(PCI_VENDOR_ID_INTEL, device_id)}
+#define E1000_USE_IOPORT (1 << 0)
+#define INTEL_E1000_ETHERNET_DEVICE(device_id, flags) {\
+ PCI_DEVICE(PCI_VENDOR_ID_INTEL, device_id), .driver_data = flags}

struct e1000_adapter;

@@ -347,6 +348,7 @@ struct e1000_adapter {
boolean_t quad_port_a;
unsigned long flags;
uint32_t eeprom_wol;
+ int bars; /* BARs to be enabled */
};

enum e1000_state_t {
diff -uprN linux-2.6.21.orig/drivers/net/e1000/e1000_main.c linux-2.6.21/drivers/net/e1000/e1000_main.c
--- linux-2.6.21.orig/drivers/net/e1000/e1000_main.c 2007-05-09 18:02:27.000000000 +0900
+++ linux-2.6.21/drivers/net/e1000/e1000_main.c 2007-05-09 18:03:00.000000000 +0900
@@ -48,65 +48,65 @@ static char e1000_copyright[] = "Copyrig
* {PCI_DEVICE(PCI_VENDOR_ID_INTEL, device_id)}
*/
static struct pci_device_id e1000_pci_tbl[] = {
- INTEL_E1000_ETHERNET_DEVICE(0x1000),
- INTEL_E1000_ETHERNET_DEVICE(0x1001),
- INTEL_E1000_ETHERNET_DEVICE(0x1004),
- INTEL_E1000_ETHERNET_DEVICE(0x1008),
- INTEL_E1000_ETHERNET_DEVICE(0x1009),
- INTEL_E1000_ETHERNET_DEVICE(0x100C),
- INTEL_E1000_ETHERNET_DEVICE(0x100D),
- INTEL_E1000_ETHERNET_DEVICE(0x100E),
- INTEL_E1000_ETHERNET_DEVICE(0x100F),
- INTEL_E1000_ETHERNET_DEVICE(0x1010),
- INTEL_E1000_ETHERNET_DEVICE(0x1011),
- INTEL_E1000_ETHERNET_DEVICE(0x1012),
- INTEL_E1000_ETHERNET_DEVICE(0x1013),
- INTEL_E1000_ETHERNET_DEVICE(0x1014),
- INTEL_E1000_ETHERNET_DEVICE(0x1015),
- INTEL_E1000_ETHERNET_DEVICE(0x1016),
- INTEL_E1000_ETHERNET_DEVICE(0x1017),
- INTEL_E1000_ETHERNET_DEVICE(0x1018),
- INTEL_E1000_ETHERNET_DEVICE(0x1019),
- INTEL_E1000_ETHERNET_DEVICE(0x101A),
- INTEL_E1000_ETHERNET_DEVICE(0x101D),
- INTEL_E1000_ETHERNET_DEVICE(0x101E),
- INTEL_E1000_ETHERNET_DEVICE(0x1026),
- INTEL_E1000_ETHERNET_DEVICE(0x1027),
- INTEL_E1000_ETHERNET_DEVICE(0x1028),
- INTEL_E1000_ETHERNET_DEVICE(0x1049),
- INTEL_E1000_ETHERNET_DEVICE(0x104A),
- INTEL_E1000_ETHERNET_DEVICE(0x104B),
- INTEL_E1000_ETHERNET_DEVICE(0x104C),
- INTEL_E1000_ETHERNET_DEVICE(0x104D),
- INTEL_E1000_ETHERNET_DEVICE(0x105E),
- INTEL_E1000_ETHERNET_DEVICE(0x105F),
- INTEL_E1000_ETHERNET_DEVICE(0x1060),
- INTEL_E1000_ETHERNET_DEVICE(0x1075),
- INTEL_E1000_ETHERNET_DEVICE(0x1076),
- INTEL_E1000_ETHERNET_DEVICE(0x1077),
- INTEL_E1000_ETHERNET_DEVICE(0x1078),
- INTEL_E1000_ETHERNET_DEVICE(0x1079),
- INTEL_E1000_ETHERNET_DEVICE(0x107A),
- INTEL_E1000_ETHERNET_DEVICE(0x107B),
- INTEL_E1000_ETHERNET_DEVICE(0x107C),
- INTEL_E1000_ETHERNET_DEVICE(0x107D),
- INTEL_E1000_ETHERNET_DEVICE(0x107E),
- INTEL_E1000_ETHERNET_DEVICE(0x107F),
- INTEL_E1000_ETHERNET_DEVICE(0x108A),
- INTEL_E1000_ETHERNET_DEVICE(0x108B),
- INTEL_E1000_ETHERNET_DEVICE(0x108C),
- INTEL_E1000_ETHERNET_DEVICE(0x1096),
- INTEL_E1000_ETHERNET_DEVICE(0x1098),
- INTEL_E1000_ETHERNET_DEVICE(0x1099),
- INTEL_E1000_ETHERNET_DEVICE(0x109A),
- INTEL_E1000_ETHERNET_DEVICE(0x10A4),
- INTEL_E1000_ETHERNET_DEVICE(0x10B5),
- INTEL_E1000_ETHERNET_DEVICE(0x10B9),
- INTEL_E1000_ETHERNET_DEVICE(0x10BA),
- INTEL_E1000_ETHERNET_DEVICE(0x10BB),
- INTEL_E1000_ETHERNET_DEVICE(0x10BC),
- INTEL_E1000_ETHERNET_DEVICE(0x10C4),
- INTEL_E1000_ETHERNET_DEVICE(0x10C5),
+ INTEL_E1000_ETHERNET_DEVICE(0x1000, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1001, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1004, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1008, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1009, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x100C, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x100D, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x100E, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x100F, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1010, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1011, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1012, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1013, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1014, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1015, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1016, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1017, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1018, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1019, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x101A, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x101D, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x101E, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1026, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1027, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1028, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1049, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x104A, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x104B, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x104C, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x104D, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x105E, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x105F, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1060, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1075, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1076, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1077, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1078, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x1079, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x107A, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x107B, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x107C, E1000_USE_IOPORT),
+ INTEL_E1000_ETHERNET_DEVICE(0x107D, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x107E, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x107F, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x108A, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x108B, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x108C, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1096, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1098, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x1099, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x109A, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x10A4, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x10B5, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x10B9, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x10BA, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x10BB, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x10BC, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x10C4, 0),
+ INTEL_E1000_ETHERNET_DEVICE(0x10C5, 0),
/* required last entry */
{0,}
};
@@ -879,7 +879,14 @@ e1000_probe(struct pci_dev *pdev,
int i, err, pci_using_dac;
uint16_t eeprom_data = 0;
uint16_t eeprom_apme_mask = E1000_EEPROM_APME;
- if ((err = pci_enable_device(pdev)))
+ int bars;
+
+ if (ent->driver_data & E1000_USE_IOPORT)
+ bars = pci_select_bars(pdev, IORESOURCE_MEM | IORESOURCE_IO);
+ else
+ bars = pci_select_bars(pdev, IORESOURCE_MEM);
+
+ if ((err = pci_enable_device_bars(pdev, bars)))
return err;

if (!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
@@ -894,7 +901,8 @@ e1000_probe(struct pci_dev *pdev,
pci_using_dac = 0;
}

- if ((err = pci_request_regions(pdev, e1000_driver_name)))
+ err = pci_request_selected_regions(pdev, bars, e1000_driver_name);
+ if (err)
goto err_pci_reg;

pci_set_master(pdev);
@@ -913,6 +921,7 @@ e1000_probe(struct pci_dev *pdev,
adapter->pdev = pdev;
adapter->hw.back = adapter;
adapter->msg_enable = (1 << debug) - 1;
+ adapter->bars = bars;

mmio_start = pci_resource_start(pdev, BAR_0);
mmio_len = pci_resource_len(pdev, BAR_0);
@@ -922,12 +931,15 @@ e1000_probe(struct pci_dev *pdev,
if (!adapter->hw.hw_addr)
goto err_ioremap;

- for (i = BAR_1; i <= BAR_5; i++) {
- if (pci_resource_len(pdev, i) == 0)
- continue;
- if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
- adapter->hw.io_base = pci_resource_start(pdev, i);
- break;
+ if (ent->driver_data & E1000_USE_IOPORT) {
+ for (i = BAR_1; i <= BAR_5; i++) {
+ if (pci_resource_len(pdev, i) == 0)
+ continue;
+ if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
+ adapter->hw.io_base =
+ pci_resource_start(pdev, i);
+ break;
+ }
}
}

@@ -1190,7 +1202,7 @@ err_sw_init:
err_ioremap:
free_netdev(netdev);
err_alloc_etherdev:
- pci_release_regions(pdev);
+ pci_release_selected_regions(pdev, bars);
err_pci_reg:
err_dma:
pci_disable_device(pdev);
@@ -1242,7 +1254,7 @@ e1000_remove(struct pci_dev *pdev)
iounmap(adapter->hw.hw_addr);
if (adapter->hw.flash_address)
iounmap(adapter->hw.flash_address);
- pci_release_regions(pdev);
+ pci_release_selected_regions(pdev, adapter->bars);

free_netdev(netdev);

@@ -5172,7 +5184,7 @@ e1000_resume(struct pci_dev *pdev)

pci_set_power_state(pdev, PCI_D0);
pci_restore_state(pdev);
- if ((err = pci_enable_device(pdev))) {
+ if ((err = pci_enable_device_bars(pdev, adapter->bars))) {
printk(KERN_ERR "e1000: Cannot enable PCI device from suspend\n");
return err;
}

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Next message: Christoph Hellwig: "Re: [PATCH] interface for doing a full host scsi rescan"
Previous message: Neil Brown: "Re: [PATCH 002 of 2] md: Improve the is_mddev_idle test"
Next in thread: Kok, Auke: "Re: [PATCH] PCI legacy I/O port free driver - Making Intel e1000driver legacy I/O port free"
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