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Date: Thu, 27 Jul 2006 15:35:46 +0000
From: "gmu 2k6" <gmu2006@...il.com>
To: "Jan Beulich" <jbeulich@...ell.com>
Cc: jgarzik@...ox.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix Intel RNG detection
On 7/27/06, gmu 2k6 <gmu2006@...il.com> wrote:
> On 7/27/06, Jan Beulich <jbeulich@...ell.com> wrote:
> > Previously, since determination whether there was an Intel random
> > number generator was based on a single bit, on systems with a matching
> > bridge device but without a firmware hub, there was a 50% chance that
> > the code would incorrectly decide that the system had an RNG. This
> > patch adds detection of the firmware hub to better qualify the
> > existence of an RNG.
> >
> > There is one issue with the patch: I was unable to determine the LPC
> > equivalent for the PCI bridge 8086:2430 (since the old code didn't
> > care about which of the many devices provided by the ICH/ESB it was
> > chose to use the PCI bridge device, but the FWH settings live in the
> > LPC device, so the device list needed to be changed).
> >
> > Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> >
> > ---
> > /home/jbeulich/tmp/linux-2.6.18-rc2/drivers/char/hw_random/intel-rng.c 2006-07-27
> > 08:50:19.000000000 +0200
> > +++
> > 2.6.18-rc2-intel-rng/drivers/char/hw_random/intel-rng.c 2006-07-27
> > 11:01:10.439631816 +0200
> > @@ -58,12 +58,50 @@
> > * want to register another driver on the same PCI id.
> > */
> > static const struct pci_device_id pci_tbl[] = {
> > - { 0x8086, 0x2418, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
> > - { 0x8086, 0x2428, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
> > - { 0x8086, 0x2430, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
> > - { 0x8086, 0x2448, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
> > - { 0x8086, 0x244e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
> > - { 0x8086, 0x245e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
> > +/* AA
> > + { 0x8086, 0x2418, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, */
> > + { 0x8086, 0x2410, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* AA */
> > +/* AB
> > + { 0x8086, 0x2428, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, */
> > + { 0x8086, 0x2420, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* AB */
> > +/* ??
> > + { 0x8086, 0x2430, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, */
> > +/* BAM, CAM, DBM, FBM, GxM
> > + { 0x8086, 0x2448, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, */
> > + { 0x8086, 0x244c, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* BAM */
> > + { 0x8086, 0x248c, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* CAM */
> > + { 0x8086, 0x24cc, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* DBM */
> > + { 0x8086, 0x2641, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* FBM */
> > + { 0x8086, 0x27b9, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* GxM */
> > + { 0x8086, 0x27bd, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* GxM DH
> > */
> > +/* BA, CA, DB, Ex, 6300, Fx, 631x/632x, Gx
> > + { 0x8086, 0x244e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, */
> > + { 0x8086, 0x2440, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* BA */
> > + { 0x8086, 0x2480, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* CA */
> > + { 0x8086, 0x24c0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* DB */
> > + { 0x8086, 0x24d0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* Ex */
> > + { 0x8086, 0x25a1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* 6300
> > */
> > + { 0x8086, 0x2640, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* Fx */
> > + { 0x8086, 0x2670, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2671, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2672, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2673, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2674, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2675, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2676, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2677, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2678, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x2679, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x267a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x267b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x267c, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x267d, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x267e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x267f, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /*
> > 631x/632x */
> > + { 0x8086, 0x27b8, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* Gx */
> > +/* E
> > + { 0x8086, 0x245e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, */
> > + { 0x8086, 0x2450, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, }, /* E */
> > { 0, }, /* terminate list */
> > };
> > MODULE_DEVICE_TABLE(pci, pci_tbl);
> > @@ -138,22 +176,102 @@ static struct hwrng intel_rng = {
> > };
> >
> >
> > +#ifdef CONFIG_SMP
> > +static volatile char __initdata waitflag;
> > +
> > +static void __init intel_init_wait (void *unused)
> > +{
> > + while (waitflag)
> > + cpu_relax();
> > +}
> > +#endif
> > +
> > static int __init mod_init(void)
> > {
> > int err = -ENODEV;
> > + unsigned i;
> > + struct pci_dev *dev = NULL;
> > void __iomem *mem;
> > - u8 hw_status;
> > -
> > - if (!pci_dev_present(pci_tbl))
> > + unsigned long flags;
> > + u8 bios_cntl_off, fwh_dec_en1_off;
> > + u8 bios_cntl_val = 0xff, fwh_dec_en1_val = 0xff;
> > + u8 hw_status, mfg, dvc;
> > +
> > + for (i = 0; !dev && pci_tbl[i].vendor; ++i)
> > + dev = pci_get_device(pci_tbl[i].vendor,
> > pci_tbl[i].device, NULL);
> > +
> > + if (!dev)
> > goto out; /* Device not found. */
> >
> > + /* Check for Intel 82802 */
> > + if (dev->device < 0x2640) {
> > + fwh_dec_en1_off = 0xe3;
> > + bios_cntl_off = 0x4e;
> > + }
> > + else {
> > + fwh_dec_en1_off = 0xd9; /* high byte of 16-bit register
> > */
> > + bios_cntl_off = 0xdc;
> > + }
> > +
> > + pci_read_config_byte(dev, fwh_dec_en1_off, &fwh_dec_en1_val);
> > + pci_read_config_byte(dev, bios_cntl_off, &bios_cntl_val);
> > +
> > + mem = ioremap_nocache(0xffff0000, 2);
> > + if (mem == NULL) {
> > + pci_dev_put(dev);
> > + err = -EBUSY;
> > + goto out;
> > + }
> > +
> > +#ifdef CONFIG_SMP
> > + waitflag = 1;
> > + if (smp_call_function(intel_init_wait, NULL, 1, 0) != 0) {
> > + waitflag = 0;
> > + pci_dev_put(dev);
> > + printk(KERN_ERR PFX "cannot run on all processors\n");
> > + err = -EAGAIN;
> > + goto err_unmap;
> > + }
> > +#else
> > +#define waitflag err
> > +#endif
> > + local_irq_save(flags);
> > +
> > + if (!(fwh_dec_en1_val & 0x80))
> > + pci_write_config_byte(dev, fwh_dec_en1_off,
> > fwh_dec_en1_val | 0x80);
> > + if (!(bios_cntl_val & 0x03))
> > + pci_write_config_byte(dev, bios_cntl_off, bios_cntl_val
> > | 0x01);
> > +
> > + writeb(0xff, mem);
> > + writeb(0x90, mem);
> > + mfg = readb(mem + 0);
> > + dvc = readb(mem + 1);
> > + writeb(0xff, mem);
> > +
> > + if (!(bios_cntl_val & 0x03))
> > + pci_write_config_byte(dev, bios_cntl_off,
> > bios_cntl_val);
> > + if (!(fwh_dec_en1_val & 0x80))
> > + pci_write_config_byte(dev, fwh_dec_en1_off,
> > fwh_dec_en1_val);
> > +
> > + local_irq_restore(flags);
> > + waitflag = 0;
> > +
> > + iounmap(mem);
> > + pci_dev_put(dev);
> > +
> > + if (mfg != 0x89 || (dvc & ~0x01) != 0xac) {
> > + printk(KERN_ERR PFX "FWH not detected\n");
> > + err = -ENODEV;
> > + goto out;
> > + }
> > +
> > err = -ENOMEM;
> > mem = ioremap(INTEL_RNG_ADDR, INTEL_RNG_ADDR_LEN);
> > if (!mem)
> > goto out;
> > intel_rng.priv = (unsigned long)mem;
> >
> > - /* Check for Intel 82802 */
> > + /* Check for Random Number Generator */
> > err = -ENODEV;
> > hw_status = hwstatus_get(mem);
> > if ((hw_status & INTEL_RNG_PRESENT) == 0)
>
> applied the diff after fixin the line-breaks locally to see what my
> ProLiant 380 tells
> me now.
>
# dmesg | grep rng
intel_rng: FWH not detected
looks like this ProLiant box with the ICH5 chip has no usable RNG
included, or should it?
-
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