| Message ID | 20130524165947.GA2487@pyxis.br.cox.net (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On 05/24/2013 12:59 PM, Bryce Lelbach wrote: > The attached patch affects pbus_size_mem() in drivers/pci/setup-bus.c. The patch > increases the maximum memory window size for a PCI bus from 2 Gb to 2^63 Gb. > > This change is necessary to support Intel Xeon Phi co-processors. These co-processors > are PCIe devices used for high-performance computing applications. The device requires > an 8Gb memory window to function (the co-processor has 8Gb of onboard memory). > > This patch is a modified version of a patch from Intel's MPSS framework > (specifically, from the "KNC_gold_update_1-2.1.4982-15-rhel-6.3" package), which > will apply to a 3.7.8 kernel (I am about to try it on a 3.8 kernel). To the best > of my knowledge, newer RHEL kernels are shipped with this patch. > This patch is not in (the latest) RHEL6(.4) or the internal staging tree for the next RHEL6(.5) release. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, May 24, 2013 at 10:59 AM, Bryce Lelbach <blelbach@cct.lsu.edu> wrote: > The attached patch affects pbus_size_mem() in drivers/pci/setup-bus.c. The patch > increases the maximum memory window size for a PCI bus from 2 Gb to 2^63 Gb. > > This change is necessary to support Intel Xeon Phi co-processors. These co-processors > are PCIe devices used for high-performance computing applications. The device requires > an 8Gb memory window to function (the co-processor has 8Gb of onboard memory). > > This patch is a modified version of a patch from Intel's MPSS framework > (specifically, from the "KNC_gold_update_1-2.1.4982-15-rhel-6.3" package), which > will apply to a 3.7.8 kernel (I am about to try it on a 3.8 kernel). To the best > of my knowledge, newer RHEL kernels are shipped with this patch. This needs a Signed-off-by before it can be applied (see Documentation/SubmittingPatches for details about what this means). Also, there's some confusion about this being in RHEL. I take it that it is not actually in RHEL, but perhaps in an Intel-supplied update that is commonly applied on top of RHEL? IIRC, a very similar patch was posted last year. It'd be nice to dig that up and credit that author as well. It's more convenient for me to receive patches as plain-text email (not attachments), also as described in SubmittingPatches. I *can* deal with attachments, but it's a hassle and I tend to keep putting them off ;) Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Sorry, my mistake (re: the RHEL thing). I'll see if I can dig up the original author's name.
diff -u -r -N linux-source-3.7/drivers/pci/setup-bus.c linux-source-3.7-xeon-phi/drivers/pci/setup-bus.c --- linux-source-3.7/drivers/pci/setup-bus.c 2013-02-14 12:57:59.000000000 -0600 +++ linux-source-3.7-xeon-phi/drivers/pci/setup-bus.c 2013-02-20 18:08:16.000000000 -0600 @@ -852,7 +852,7 @@ { struct pci_dev *dev; resource_size_t min_align, align, size, size0, size1; - resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */ + resource_size_t aligns[44]; /* Alignments from 1Mb to 2^63 */ int order, max_order; struct resource *b_res = find_free_bus_resource(bus, type); unsigned int mem64_mask = 0; @@ -891,7 +891,8 @@ /* For bridges size != alignment */ align = pci_resource_alignment(dev, r); order = __ffs(align) - 20; - if (order > 11) { + if ((sizeof(size_t) == 4 && order > 11) || + (sizeof(size_t) == 8 && order > 43)) { dev_warn(&dev->dev, "disabling BAR %d: %pR " "(bad alignment %#llx)\n", i, r, (unsigned long long) align);