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

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Kok, Auke wrote:

Tomohiro Kusumi wrote:

Dear Auke

 > I'm ok with the bottom part of the patch, but I do not like
 > the modification of the pci device ID table in this way. As
 > Arjan van der Ven previously commented as well, this makes
 > it hard for future device ID's to be bound to the driver.

  I googled the previous comment by Arjan. Now I understand
  that the patch makes it difficult to add PCI ID's to the
  driver at runtime.

 > On top of that, there is no logical correlation between the
 > mapping and chipsets, so a lot of information is lost in that
 > table. It really does not show which _chipsets_ support this
 > functionality.

  Thanks for pointing out the problem, but I can't quite understand
  what you are trying to say. What do you mean by the chipset?
  Are you talking about the chipset of the NIC? or the South bridge?
  I'd be glad if you can explain it to me.
perhaps my wording was poor. I was referring to the NIC chip. Since there are about 12 different physical e1000 NIC chips (and lots of different pci IDs per e1000 NIC chip), it would be best to correlate the capability of each NIC chip number to be able to work without legacy IO mode instead of providing this mapping based on the PCI device ID.
It would serve two purposes: new pci id's for a chipset of which we already know that it can work without legacy IO can automatically inherit this property from the NIC chipset properties, and new e1000 chips would automatically get a default property for this value.
I will (time permitting) try to reverse your matrix to chip numbers and see if we can add this property in a much easier way. 

Okay, you appear to enable io for the following chipsets:

82540 chips:
 82540EM
 82540EM_LOM
 82540EP
 82540EP_LOM
 82540EP_LP
those are all the 82540's, OK

82541 chips:
 82541EI
 82541EI_MOBILE
 82541ER
 82541ER_LOM
 82541GI
 82541GI_LF
 82541GI_MOBILE
Those are all the 82541's, OK too

82544 chips:
 82544EI_COPPER
 82544EI_FIBER
 82544GC_COPPER
 82544GC_LOM
Those are all the 82543's, OK too

82545's:
 82545EM_COPPER
 82545EM_FIBER
Here you skip 3 other 82545 device ID's, was that intentional?

82546's:
 82546EB_COPPER
 82546EB_FIBER
 82546EB_QUAD_COPPER
Here you skip over 9 82546 device ID's... same question.
It appears that probably the 82543's would also work under ioport, 82547 might be the odd one out that might work without IOport. I think 82542 definately needs it... 

can you tell me how you created the initial list?

Summarizing, it appears that we should condense the list to: (sketch)

 switch (adapter->hw.mac.type) {
 case e1000_82542 ... e1000_82541_rev_2:
        adapter->ioport_capable = 1;
	break;
 default:
	break;
 }
I also would like this option to be non-default, IOW use legacy IO by default, and allow the user to specify a module load option to disable use of this feature: 

static unsigned int use_ioport = 1;
module_param(use_ioport, uint, 0644);
MODULE_PARM_DESC(use_ioport, "Use Legacy IO port mapping (default: 1)");
or something like this to allow the feature to be tested before we turn legacy ioport off for all adapters and everyone. 

Do you think you can accomodate these changes?

Cheers,

Auke






Auke


Tomohiro Kusumi


Kok, Auke wrote:

Tomohiro Kusumi wrote:

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,
I'm ok with the bottom part of the patch, but I do not like the modification of the pci device ID table in this way. As Arjan van der Ven previously commented as well, this makes it hard for future device ID's to be bound to the driver.
On top of that, there is no logical correlation between the mapping and chipsets, so a lot of information is lost in that table. It really does not show which _chipsets_ support this functionality.
I think if we want to work with this, we need some way of mapping the device ID's back to chipsets, and enable the feature on that basis. 

Auke


Tomohiro Kusumi

Signed-off-by: Tomohiro Kusumi <[email protected]>

---
 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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