Re: [Bug #16891] Kernel panic while loading intel module during boot

From: Rafael J. Wysocki
Date: Mon Oct 04 2010 - 15:43:20 EST

On Monday, October 04, 2010, Anisse Astier wrote:
> On Sun, 3 Oct 2010 23:53:02 +0200 (CEST), "Rafael J. Wysocki" <rjw@xxxxxxx> wrote :
>
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.34 and 2.6.35.
> >
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.34 and 2.6.35. Please verify if it still should
> > be listed and let the tracking team know (either way).
> >
> >
> > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=16891
> > Subject : Kernel panic while loading intel module during boot
> > Submitter : Anisse Astier <anisse@xxxxxxxxx>
> > Date : 2010-08-24 13:19 (41 days old)
> >
> >
>
> This bug is still valid, and should be listed as a regression.
> I tried to upload on bugzilla a patch authored by Daniel Vetter that fixes
> the problem, but then bugzilla went into blackhole mode.
>
> I'll provide this patch here in the meantime in case anyone is interested.

Thanks for the update and the patch.

Well, I wonder who's going to merge it?

Rafael


> ---
> From: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Date: Fri, 1 Oct 2010 19:52:09 +0200
> Subject: [PATCH] intel-gtt: fix 2.6.35 regression
>
> Port of commit "intel-gtt: fix gtt_total_entries detection" to 2.6.35.
>
> Also adds PINEVIEW_IG to IS_G33 detection list
>
> Signed-off-by: Anisse Astier <anisse@xxxxxxxxx>
> ---
> drivers/char/agp/intel-agp.h | 1 +
> drivers/char/agp/intel-gtt.c | 63 ++++++++++++++++++------------------------
> 2 files changed, 28 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/char/agp/intel-agp.h b/drivers/char/agp/intel-agp.h
> index bc9a4ad..2fbbe63 100644
> --- a/drivers/char/agp/intel-agp.h
> +++ b/drivers/char/agp/intel-agp.h
> @@ -226,6 +226,7 @@
> agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_Q35_HB || \
> agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_Q33_HB || \
> agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_PINEVIEW_M_HB || \
> + agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_PINEVIEW_IG || \
> agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_PINEVIEW_HB)
>
> #define IS_PINEVIEW (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_PINEVIEW_M_HB || \
> diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
> index ed11c77..ea18f64 100644
> --- a/drivers/char/agp/intel-gtt.c
> +++ b/drivers/char/agp/intel-gtt.c
> @@ -501,7 +501,7 @@ static void intel_i830_init_gtt_entries(void)
>
> pci_read_config_word(agp_bridge->dev, I830_GMCH_CTRL, &gmch_ctrl);
>
> - if (IS_I965) {
> + if (IS_G33 || IS_I965) {
> u32 pgetbl_ctl;
> pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
>
> @@ -534,22 +534,6 @@ static void intel_i830_init_gtt_entries(void)
> size = 512;
> }
> size += 4; /* add in BIOS popup space */
> - } else if (IS_G33 && !IS_PINEVIEW) {
> - /* G33's GTT size defined in gmch_ctrl */
> - switch (gmch_ctrl & G33_PGETBL_SIZE_MASK) {
> - case G33_PGETBL_SIZE_1M:
> - size = 1024;
> - break;
> - case G33_PGETBL_SIZE_2M:
> - size = 2048;
> - break;
> - default:
> - dev_info(&agp_bridge->dev->dev,
> - "unknown page table size 0x%x, assuming 512KB\n",
> - (gmch_ctrl & G33_PGETBL_SIZE_MASK));
> - size = 512;
> - }
> - size += 4;
> } else if (IS_G4X || IS_PINEVIEW) {
> /* On 4 series hardware, GTT stolen is separate from graphics
> * stolen, ignore it in stolen gtt entries counting. However,
> @@ -1220,24 +1204,31 @@ static int intel_i915_get_gtt_size(void)
> int size;
>
> if (IS_G33) {
> - u16 gmch_ctrl;
> + u32 pgetbl_ctl;
> + pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
>
> - /* G33's GTT size defined in gmch_ctrl */
> - pci_read_config_word(agp_bridge->dev, I830_GMCH_CTRL, &gmch_ctrl);
> - switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
> - case I830_GMCH_GMS_STOLEN_512:
> + switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
> + case I965_PGETBL_SIZE_128KB:
> + size = 128;
> + break;
> + case I965_PGETBL_SIZE_256KB:
> + size = 256;
> + break;
> + case I965_PGETBL_SIZE_512KB:
> size = 512;
> break;
> - case I830_GMCH_GMS_STOLEN_1024:
> + case I965_PGETBL_SIZE_1MB:
> size = 1024;
> break;
> - case I830_GMCH_GMS_STOLEN_8192:
> - size = 8*1024;
> + case I965_PGETBL_SIZE_2MB:
> + size = 2048;
> + break;
> + case I965_PGETBL_SIZE_1_5MB:
> + size = 1024 + 512;
> break;
> default:
> - dev_info(&agp_bridge->dev->dev,
> - "unknown page table size 0x%x, assuming 512KB\n",
> - (gmch_ctrl & I830_GMCH_GMS_MASK));
> + dev_info(&intel_private.pcidev->dev,
> + "unknown page table size, assuming 512KB\n");
> size = 512;
> }
> } else {
> @@ -1269,14 +1260,6 @@ static int intel_i915_create_gatt_table(struct agp_bridge_data *bridge)
> pci_read_config_dword(intel_private.pcidev, I915_MMADDR, &temp);
> pci_read_config_dword(intel_private.pcidev, I915_PTEADDR, &temp2);
>
> - gtt_map_size = intel_i915_get_gtt_size();
> -
> - intel_private.gtt = ioremap(temp2, gtt_map_size);
> - if (!intel_private.gtt)
> - return -ENOMEM;
> -
> - intel_private.gtt_total_size = gtt_map_size / 4;
> -
> temp &= 0xfff80000;
>
> intel_private.registers = ioremap(temp, 128 * 4096);
> @@ -1285,6 +1268,14 @@ static int intel_i915_create_gatt_table(struct agp_bridge_data *bridge)
> return -ENOMEM;
> }
>
> + gtt_map_size = intel_i915_get_gtt_size();
> +
> + intel_private.gtt = ioremap(temp2, gtt_map_size);
> + if (!intel_private.gtt)
> + return -ENOMEM;
> +
> + intel_private.gtt_total_size = gtt_map_size / 4;
> +
> temp = readl(intel_private.registers+I810_PGETBL_CTL) & 0xfffff000;
> global_cache_flush(); /* FIXME: ? */
>
>

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