Re: Info: mapping multiple BARs. Your kernel is fine.

[Yan, Zheng]

On 03/20/2014 03:53 PM, Zhang, Rui wrote:
> The resource length is also hardcoded to 0x6000, right?
> This is probably a problem, because
> only if the resource length read from PCI config space is larger than 0x4000,
> drivers/pnp/quirks.c will detect the conflict and disable the PNP0C02
> resource 0xfed10000 - 0xfed13fff, and the PCI device can request this
> resource successfully.
> In order to check this, can you please attach the dmesg output after boot?

maybe the issue can be fixed by below untested patch

---
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index fd5e883..2b3d834 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -1701,7 +1701,7 @@ static struct uncore_event_desc snb_uncore_imc_events[] = {
 #define SNB_UNCORE_PCI_IMC_BAR_OFFSET		0x48
 
 /* page size multiple covering all config regs */
-#define SNB_UNCORE_PCI_IMC_MAP_SIZE		0x6000
+#define SNB_UNCORE_PCI_IMC_MAP_SIZE		0x8
 
 #define SNB_UNCORE_PCI_IMC_DATA_READS		0x1
 #define SNB_UNCORE_PCI_IMC_DATA_READS_BASE	0x5050
@@ -1736,7 +1736,8 @@ static void snb_uncore_imc_init_box(struct intel_uncore_box *box)
 
 	addr &= ~(PAGE_SIZE - 1);
 
-	box->io_addr = ioremap(addr, SNB_UNCORE_PCI_IMC_MAP_SIZE);
+	box->io_addr = ioremap(addr + SNB_UNCORE_PCI_IMC_CTR_BASE,
+			       SNB_UNCORE_PCI_IMC_MAP_SIZE);
 	box->hrtimer_duration = UNCORE_SNB_IMC_HRTIMER_INTERVAL;
 }
 
@@ -1832,7 +1833,7 @@ static int snb_uncore_imc_event_init(struct perf_event *event)
 	}
 
 	/* must be done before validate_group */
-	event->hw.event_base = base;
+	event->hw.event_base = base - SNB_UNCORE_PCI_IMC_CTR_BASE;
 	event->hw.config = cfg;
 	event->hw.idx = idx;
 
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