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Date: Wed, 04 Feb 2009 15:10:34 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>
CC: Ed Swierk <eswierk@...stanetworks.com>, tglx@...utronix.de,
mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
lenb@...nel.org, linux-acpi@...r.kernel.org,
jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] Detect mmconfig on nVidia MCP55
Ingo Molnar wrote:
>
> To detect enabled on-CPU mmconf support. We could even put this into a
> helper function as other places might want to use it too.
>
sth like:
[PATCH] x86/pci: host mmconfig detect clean up
Impact: not assume one place for mmconfig in nb
prepare for following case: amd fam10h + mcp55
CPU MSR has some range, mcp55 pci config will have another one.
in some case: cpu MSR only include bus 0, and leave other to mcp55.
if it s mcp55 detect duties to execlude range that is used by CPU MSR
aka, if CPU state bus 0-255, range in mcp55 need to be dropped.
because HW in CPU will not route that mcp55 mmconfig to handle it.
Signed-off-by: Yinghai Lu <yinghai.lu@...nel.org>
---
arch/x86/pci/mmconfig-shared.c | 90 ++++++++++++++++++++++-------------------
1 file changed, 50 insertions(+), 40 deletions(-)
Index: linux-2.6/arch/x86/pci/mmconfig-shared.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/mmconfig-shared.c
+++ linux-2.6/arch/x86/pci/mmconfig-shared.c
@@ -24,23 +24,47 @@
/* Indicate if the mmcfg resources have been placed into the resource table. */
static int __initdata pci_mmcfg_resources_inserted;
+static __init int extend_mmcfg(int num)
+{
+ struct acpi_mcfg_allocation *new;
+ int new_num = pci_mmcfg_config_num + num;
+
+ new = kzalloc(sizeof(pci_mmcfg_config[0]) * new_num, GFP_KERNEL);
+ if (!new)
+ return -1;
+
+ if (pci_mmcfg_config) {
+ memcpy(new, pci_mmcfg_config,
+ (sizeof(pci_mmcfg_config[0]) * new_num));
+ kfree(pci_mmcfg_config);
+ }
+ pci_mmcfg_config = new;
+
+ return 0;
+}
+
+static __init void fill_one_mmcfg(u64 addr, int segment, int start, int end)
+{
+ int i = pci_mmcfg_config_num;
+
+ pci_mmcfg_config_num++;
+ pci_mmcfg_config[i].address = addr;
+ pci_mmcfg_config[i].pci_segment = segment;
+ pci_mmcfg_config[i].start_bus_number = start;
+ pci_mmcfg_config[i].end_bus_number = end;
+}
+
static const char __init *pci_mmcfg_e7520(void)
{
u32 win;
raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0xce, 2, &win);
win = win & 0xf000;
- if(win == 0x0000 || win == 0xf000)
- pci_mmcfg_config_num = 0;
- else {
- pci_mmcfg_config_num = 1;
- pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
- if (!pci_mmcfg_config)
+ if (win != 0x0000 && win != 0xf000) {
+ if (extend_mmcfg(1) == -1)
return NULL;
- pci_mmcfg_config[0].address = win << 16;
- pci_mmcfg_config[0].pci_segment = 0;
- pci_mmcfg_config[0].start_bus_number = 0;
- pci_mmcfg_config[0].end_bus_number = 255;
+
+ fill_one_mmcfg(win << 16, 0, 0, 255);
}
return "Intel Corporation E7520 Memory Controller Hub";
@@ -50,13 +74,11 @@ static const char __init *pci_mmcfg_inte
{
u32 pciexbar, mask = 0, len = 0;
- pci_mmcfg_config_num = 1;
-
raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0x48, 4, &pciexbar);
/* Enable bit */
if (!(pciexbar & 1))
- pci_mmcfg_config_num = 0;
+ return NULL;
/* Size bits */
switch ((pciexbar >> 1) & 3) {
@@ -73,28 +95,23 @@ static const char __init *pci_mmcfg_inte
len = 0x04000000U;
break;
default:
- pci_mmcfg_config_num = 0;
+ return NULL;
}
/* Errata #2, things break when not aligned on a 256Mb boundary */
/* Can only happen in 64M/128M mode */
if ((pciexbar & mask) & 0x0fffffffU)
- pci_mmcfg_config_num = 0;
+ return NULL;
/* Don't hit the APIC registers and their friends */
if ((pciexbar & mask) >= 0xf0000000U)
- pci_mmcfg_config_num = 0;
+ return NULL;
- if (pci_mmcfg_config_num) {
- pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
- if (!pci_mmcfg_config)
- return NULL;
- pci_mmcfg_config[0].address = pciexbar & mask;
- pci_mmcfg_config[0].pci_segment = 0;
- pci_mmcfg_config[0].start_bus_number = 0;
- pci_mmcfg_config[0].end_bus_number = (len >> 20) - 1;
- }
+ if (extend_mmcfg(1) == -1)
+ return NULL;
+
+ fill_one_mmcfg(pciexbar & mask, 0, 0, (len >> 20) - 1);
return "Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub";
}
@@ -138,18 +155,12 @@ static const char __init *pci_mmcfg_amd_
busnbits = 8;
}
- pci_mmcfg_config_num = (1 << segnbits);
- pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]) *
- pci_mmcfg_config_num, GFP_KERNEL);
- if (!pci_mmcfg_config)
+ if (extend_mmcfg(1 << segnbits) == -1)
return NULL;
- for (i = 0; i < (1 << segnbits); i++) {
- pci_mmcfg_config[i].address = base + (1<<28) * i;
- pci_mmcfg_config[i].pci_segment = i;
- pci_mmcfg_config[i].start_bus_number = 0;
- pci_mmcfg_config[i].end_bus_number = (1 << busnbits) - 1;
- }
+
+ for (i = 0; i < (1 << segnbits); i++)
+ fill_one_mmcfg(base + (1<<28) * i, i, 0, (1 << busnbits) - 1);
return "AMD Family 10h NB";
}
@@ -198,14 +209,13 @@ static int __init pci_mmcfg_check_hostbr
if (pci_mmcfg_probes[i].vendor == vendor &&
pci_mmcfg_probes[i].device == device)
name = pci_mmcfg_probes[i].probe();
- }
- if (name) {
- printk(KERN_INFO "PCI: Found %s %s MMCONFIG support.\n",
- name, pci_mmcfg_config_num ? "with" : "without");
+ if (name)
+ printk(KERN_INFO "PCI: Found %s with MMCONFIG support.\n",
+ name);
}
- return name != NULL;
+ return pci_mmcfg_config_num != 0;
}
static void __init pci_mmcfg_insert_resources(void)
--
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