On Thu, Aug 07, 2008 at 12:04:19AM +0400, Sergei Shtylyov wrote: [.. ] >>>>> Would have been probably enough to test only BAR0/2, don't you think? > >>>> I assume you're referring to the legacy ioports fixup in >>>> drivers/pci/probe.c:pci_setup_device(). > >>> And to the fact that the value 0x1f0 should only be ever seen in >>> BAR0 and 0x170 in BAR2 even if they would have been read off the >>> chips (some chips have these values reading back even in legacy mode, >>> and even could malfunction if other values are written there), not >>> fixed up there, and certainly not in BAR1 or BAR3, so it's quite >>> pointless to look in these BARs too. > >> So the comment in there saying that in some cases BAR0-3 could contain junk is a >> bogus? > > Don't know. The PCI IDE spec. said that those should be 0 in > compatibility mode but I know that some controllers require the standard > values of 0x1[f7]0 to be in BAR0/2 in compatibility mode. If my memory > serves, NatSemi PC8741x were ones of those... > >> In other words, can we assume that one will always read 0x1f0 from BAR0 >> and 0x170 from BAR2 in compatibility mode. > > Certainly not. We can only rely on the workaround putting 0x1[f7]0 in > the resources 0/2. > >> If so, the check is even simpler: > >> if (pci_resource_start(p, 0) == 0x1f0) >> *primary = 1; >> if (pci_resource_start(p, 2) == 0x170) >> *secondary = 1; > > Yes, I think that should be enough... Here's v5: --- From: Borislav Petkov <petkovbb@xxxxxxxxx> Date: Sun, 3 Aug 2008 18:46:35 +0200 Subject: [PATCH] ide-generic: handle probing of legacy io-ports v5 Avoid probing the io-ports in case an IDE PCI controller is present and it uses the legacy iobases. If we still want to enforce the probing, we do ide_generic.probe_mask=0x3f on the kernel command line. The iobase checking code is adapted from drivers/ata/pata_legacy.c after converting hex pci ids into their corresponding macros in <linux/pci_ids.h>. Also, check only BAR0/2 resources since those are guaranteed by the workaround in drivers/pci/probe.c:pci_setup_device(). CC: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx> Signed-off-by: Borislav Petkov <petkovbb@xxxxxxxxx> --- drivers/ide/ide-generic.c | 56 +++++++++++++++++++++++++++++++++++++++++--- 1 files changed, 52 insertions(+), 4 deletions(-) diff --git a/drivers/ide/ide-generic.c b/drivers/ide/ide-generic.c index 8fe8b5b..608f353 100644 --- a/drivers/ide/ide-generic.c +++ b/drivers/ide/ide-generic.c @@ -19,6 +19,7 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/ide.h> +#include <linux/pci_ids.h> /* FIXME: convert m32r to use ide_platform host driver */ #ifdef CONFIG_M32R @@ -27,7 +28,7 @@ #define DRV_NAME "ide_generic" -static int probe_mask = 0x03; +static int probe_mask; module_param(probe_mask, int, 0); MODULE_PARM_DESC(probe_mask, "probe mask for legacy ISA IDE ports"); @@ -100,19 +101,66 @@ static const u16 legacy_bases[] = { 0x1f0, 0x170, 0x1e8, 0x168, 0x1e0, 0x160 }; static const int legacy_irqs[] = { 14, 15, 11, 10, 8, 12 }; #endif +static void ide_generic_check_pci_legacy_iobases(int *primary, int *secondary) +{ + struct pci_dev *p = NULL; + u16 val; + + for_each_pci_dev(p) { + + if (pci_resource_start(p, 0) == 0x1f0) + *primary = 1; + if (pci_resource_start(p, 2) == 0x170) + *secondary = 1; + + /* Cyrix CS55{1,2}0 pre SFF MWDMA ATA on the bridge */ + if (p->vendor == PCI_VENDOR_ID_CYRIX && + (p->device == PCI_DEVICE_ID_CYRIX_5510 || + p->device == PCI_DEVICE_ID_CYRIX_5520)) + *primary = *secondary = 1; + + /* Intel MPIIX - PIO ATA on non PCI side of bridge */ + if (p->vendor == PCI_VENDOR_ID_INTEL && + p->device == PCI_DEVICE_ID_INTEL_82371MX) { + + pci_read_config_word(p, 0x6C, &val); + if (val & 0x8000) { + /* ATA port enabled */ + if (val & 0x4000) + *secondary = 1; + else + *primary = 1; + } + } + } +} + static int __init ide_generic_init(void) { hw_regs_t hw[MAX_HWIFS], *hws[MAX_HWIFS]; struct ide_host *host; unsigned long io_addr; - int i, rc; + int i, rc, primary = 0, secondary = 0; #ifdef CONFIG_MIPS if (!ide_probe_legacy()) return -ENODEV; #endif - printk(KERN_INFO DRV_NAME ": please use \"probe_mask=0x3f\" module " - "parameter for probing all legacy ISA IDE ports\n"); + ide_generic_check_pci_legacy_iobases(&primary, &secondary); + + if (!probe_mask) { + printk(KERN_INFO DRV_NAME ": please use \"probe_mask=0x3f\" " + "module parameter for probing all legacy ISA IDE ports\n"); + + if (primary == 0) + probe_mask |= 0x1; + + if (secondary == 0) + probe_mask |= 0x2; + } else { + printk(KERN_WARNING "%s: enforcing probing of io ports upon " + "user request.\n", DRV_NAME); + } memset(hws, 0, sizeof(hw_regs_t *) * MAX_HWIFS); -- 1.5.5.4 -- Regards/Gruss, Boris. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html