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Message-Id: <11798211672108-git-send-email-muli@il.ibm.com>
Date: Tue, 22 May 2007 04:05:55 -0400
From: muli@...ibm.com
To: ak@...e.de
Cc: linux-kernel@...r.kernel.org, discuss@...-64.org, jdmason@...zu.us,
michaelv@...ibm.com, guillaume.thouvenin@....bull.net,
muli@...ibm.com
Subject: [PATCH 6/15] x86-64: Calgary - introduce CalIOC2 support
From: Muli Ben-Yehuda <muli@...ibm.com>
CalIOC2 is a PCI-e implementation of the Calgary logic. Most of the
programming details are the same, but some differ, e.g., TCE cache
flush. This patch introduces CalIOC2 support - detection and various
support routines. It's not expected to work yet (but will with
follow-on patches).
Signed-off-by: Muli Ben-Yehuda <muli@...ibm.com>
---
arch/x86_64/kernel/pci-calgary.c | 196 ++++++++++++++++++++++++++++++--------
1 files changed, 156 insertions(+), 40 deletions(-)
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index c5f92ea..3945437 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -50,8 +50,7 @@ int use_calgary __read_mostly = 0;
#endif /* CONFIG_CALGARY_DEFAULT_ENABLED */
#define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
-#define PCI_VENDOR_DEVICE_ID_CALGARY \
- (PCI_VENDOR_ID_IBM | PCI_DEVICE_ID_IBM_CALGARY << 16)
+#define PCI_DEVICE_ID_IBM_CALIOC2 0x0308
/* we need these for register space address calculation */
#define START_ADDRESS 0xfe000000
@@ -193,6 +192,7 @@ static inline unsigned long verify_bit_r
{
return ~0UL;
}
+
#endif /* CONFIG_IOMMU_DEBUG */
static inline unsigned int num_dma_pages(unsigned long dma, unsigned int dmalen)
@@ -346,9 +346,20 @@ static void iommu_free(struct iommu_tabl
static inline struct iommu_table *find_iommu_table(struct device *dev)
{
+ struct pci_dev *pdev;
+ struct pci_bus *pbus;
struct iommu_table *tbl;
- tbl = to_pci_dev(dev)->bus->self->sysdata;
+ pdev = to_pci_dev(dev);
+
+ /* is the device behind a bridge? */
+ if (unlikely(pdev->bus->parent))
+ pbus = pdev->bus->parent;
+ else
+ pbus = pdev->bus;
+
+ tbl = pbus->self->sysdata;
+ BUG_ON(pdev->bus->parent && (tbl->it_busno != pdev->bus->parent->number));
return tbl;
}
@@ -565,6 +576,21 @@ static inline void __iomem* calgary_reg(
return (void __iomem*)target;
}
+static inline int is_calioc2(unsigned short device)
+{
+ return (device == PCI_DEVICE_ID_IBM_CALIOC2);
+}
+
+static inline int is_calgary(unsigned short device)
+{
+ return (device == PCI_DEVICE_ID_IBM_CALGARY);
+}
+
+static inline int is_cal_pci_dev(unsigned short device)
+{
+ return (is_calgary(device) || is_calioc2(device));
+}
+
static void calgary_tce_cache_blast(struct iommu_table *tbl)
{
u64 val;
@@ -685,8 +711,14 @@ static void __init calgary_reserve_regio
iommu_range_reserve(tbl, bad_dma_address, EMERGENCY_PAGES);
/* avoid the BIOS/VGA first 640KB-1MB region */
- start = (640 * 1024);
- npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
+ /* for CalIOC2 - avoid the entire first 2MB */
+ if (is_calgary(dev->device)) {
+ start = (640 * 1024);
+ npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
+ } else { /* calioc2 */
+ start = 0;
+ npages = (2 * 1024 * 1024) >> PAGE_SHIFT;
+ }
iommu_range_reserve(tbl, start, npages);
/* reserve the two PCI peripheral memory regions in IO space */
@@ -721,15 +753,15 @@ static int __init calgary_setup_tar(stru
/* zero out all TAR bits under sw control */
val64 &= ~TAR_SW_BITS;
-
- tbl = dev->sysdata;
table_phys = (u64)__pa(tbl->it_base);
+
val64 |= table_phys;
BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
val64 |= (u64) specified_table_size;
tbl->tar_val = cpu_to_be64(val64);
+
writeq(tbl->tar_val, target);
readq(target); /* flush */
@@ -760,6 +792,43 @@ static void __init calgary_free_bus(stru
bus_info[dev->bus->number].tce_space = NULL;
}
+static void calgary_dump_error_regs(struct iommu_table *tbl)
+{
+ void __iomem *bbar = tbl->bbar;
+ u32 csr, csmr, plssr, mck;
+ void __iomem *target;
+ unsigned long phboff = phb_offset(tbl->it_busno);
+ unsigned long erroff;
+ u32 errregs[7];
+ int i;
+
+ /* dump CSR */
+ target = calgary_reg(bbar, phboff | PHB_CSR_OFFSET);
+ csr = be32_to_cpu(readl(target));
+ /* dump PLSSR */
+ target = calgary_reg(bbar, phboff | PHB_PLSSR_OFFSET);
+ plssr = be32_to_cpu(readl(target));
+ /* dump CSMR */
+ target = calgary_reg(bbar, phboff | 0x290);
+ csmr = be32_to_cpu(readl(target));
+ /* dump mck */
+ target = calgary_reg(bbar, phboff | 0x800);
+ mck = be32_to_cpu(readl(target));
+
+ printk(KERN_EMERG "Calgary: 0x%08x@CSR 0x%08x@...SR 0x%08x@...R "
+ "0x%08x@MCK\n", csr, plssr, csmr, mck);
+
+ /* dump rest of error regs */
+ printk(KERN_EMERG "Calgary: ");
+ for (i = 0; i < ARRAY_SIZE(errregs); i++) {
+ erroff = (0x810 + (i * 0x10)); /* err regs are at 0x810 - 0x870 */
+ target = calgary_reg(bbar, phboff | erroff);
+ errregs[i] = be32_to_cpu(readl(target));
+ printk("0x%08x@...lx ", errregs[i], erroff);
+ }
+ printk("\n");
+}
+
static void calgary_watchdog(unsigned long data)
{
struct pci_dev *dev = (struct pci_dev *)data;
@@ -773,13 +842,16 @@ static void calgary_watchdog(unsigned lo
/* If no error, the agent ID in the CSR is not valid */
if (val32 & CSR_AGENT_MASK) {
- printk(KERN_EMERG "calgary_watchdog: DMA error on PHB %#x, "
- "CSR = %#x\n", dev->bus->number, val32);
+ printk(KERN_EMERG "Calgary: DMA error on PHB %#x\n",
+ dev->bus->number);
+ calgary_dump_error_regs(tbl);
+
+ /* reset error */
writel(0, target);
/* Disable bus that caused the error */
target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
- PHB_CONFIG_RW_OFFSET);
+ PHB_CONFIG_RW_OFFSET);
val32 = be32_to_cpu(readl(target));
val32 |= PHB_SLOT_DISABLE;
writel(cpu_to_be32(val32), target);
@@ -853,7 +925,9 @@ static void __init calgary_enable_transl
val32 = be32_to_cpu(readl(target));
val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
- printk(KERN_INFO "Calgary: enabling translation on PHB %#x\n", busnum);
+ printk(KERN_INFO "Calgary: enabling translation on %s PHB %#x\n",
+ (dev->device == PCI_DEVICE_ID_IBM_CALGARY) ?
+ "Calgary" : "CalIOC2", busnum);
printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
"bus.\n");
@@ -894,7 +968,12 @@ static void __init calgary_init_one_nont
{
pci_dev_get(dev);
dev->sysdata = NULL;
- dev->bus->self = dev;
+
+ /* is the device behind a bridge? */
+ if (dev->bus->parent)
+ dev->bus->parent->self = dev;
+ else
+ dev->bus->self = dev;
}
static int __init calgary_init_one(struct pci_dev *dev)
@@ -911,7 +990,14 @@ static int __init calgary_init_one(struc
goto done;
pci_dev_get(dev);
- dev->bus->self = dev;
+
+ if (dev->bus->parent) {
+ if (dev->bus->parent->self)
+ printk(KERN_WARNING "Calgary: IEEEE, dev %p has "
+ "bus->parent->self!\n", dev);
+ dev->bus->parent->self = dev;
+ } else
+ dev->bus->self = dev;
tbl = dev->sysdata;
tbl->chip_ops->handle_quirks(tbl, dev);
@@ -951,11 +1037,18 @@ static int __init calgary_locate_bbars(v
target = calgary_reg(bbar, offset);
val = be32_to_cpu(readl(target));
+
start_bus = (u8)((val & 0x00FF0000) >> 16);
end_bus = (u8)((val & 0x0000FF00) >> 8);
- for (bus = start_bus; bus <= end_bus; bus++) {
- bus_info[bus].bbar = bbar;
- bus_info[bus].phbid = phb;
+
+ if (end_bus) {
+ for (bus = start_bus; bus <= end_bus; bus++) {
+ bus_info[bus].bbar = bbar;
+ bus_info[bus].phbid = phb;
+ }
+ } else {
+ bus_info[start_bus].bbar = bbar;
+ bus_info[start_bus].phbid = phb;
}
}
}
@@ -975,24 +1068,27 @@ static int __init calgary_init(void)
{
int ret;
struct pci_dev *dev = NULL;
+ void* tce_space;
ret = calgary_locate_bbars();
if (ret)
return ret;
do {
- dev = pci_get_device(PCI_VENDOR_ID_IBM,
- PCI_DEVICE_ID_IBM_CALGARY,
- dev);
+ dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
if (!dev)
break;
+ if (!is_cal_pci_dev(dev->device))
+ continue;
if (!translate_phb(dev)) {
calgary_init_one_nontraslated(dev);
continue;
}
- if (!bus_info[dev->bus->number].tce_space && !translate_empty_slots)
+ tce_space = bus_info[dev->bus->number].tce_space;
+ if (!tce_space && !translate_empty_slots) {
+ printk("Calg: %p failed tce_space check\n", dev);
continue;
-
+ }
ret = calgary_init_one(dev);
if (ret)
goto error;
@@ -1003,10 +1099,11 @@ static int __init calgary_init(void)
error:
do {
dev = pci_get_device_reverse(PCI_VENDOR_ID_IBM,
- PCI_DEVICE_ID_IBM_CALGARY,
- dev);
+ PCI_ANY_ID, dev);
if (!dev)
break;
+ if (!is_cal_pci_dev(dev->device))
+ continue;
if (!translate_phb(dev)) {
pci_dev_put(dev);
continue;
@@ -1084,9 +1181,29 @@ static int __init build_detail_arrays(vo
return 0;
}
-void __init detect_calgary(void)
+static int __init calgary_bus_has_devices(int bus, unsigned short pci_dev)
{
+ int dev;
u32 val;
+
+ if (pci_dev == PCI_DEVICE_ID_IBM_CALIOC2) {
+ /*
+ * FIXME: properly scan for devices accross the
+ * PCI-to-PCI bridge on every CalIOC2 port.
+ */
+ return 1;
+ }
+
+ for (dev = 1; dev < 8; dev++) {
+ val = read_pci_config(bus, dev, 0, 0);
+ if (val != 0xffffffff)
+ break;
+ }
+ return (val != 0xffffffff);
+}
+
+void __init detect_calgary(void)
+{
int bus;
void *tbl;
int calgary_found = 0;
@@ -1143,29 +1260,28 @@ void __init detect_calgary(void)
specified_table_size = determine_tce_table_size(end_pfn * PAGE_SIZE);
for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
- int dev;
struct calgary_bus_info *info = &bus_info[bus];
+ unsigned short pci_device;
+ u32 val;
+
+ val = read_pci_config(bus, 0, 0, 0);
+ pci_device = (val & 0xFFFF0000) >> 16;
- if (read_pci_config(bus, 0, 0, 0) != PCI_VENDOR_DEVICE_ID_CALGARY)
+ if (!is_cal_pci_dev(pci_device))
continue;
if (info->translation_disabled)
continue;
- /*
- * Scan the slots of the PCI bus to see if there is a device present.
- * The parent bus will be the zero-ith device, so start at 1.
- */
- for (dev = 1; dev < 8; dev++) {
- val = read_pci_config(bus, dev, 0, 0);
- if (val != 0xffffffff || translate_empty_slots) {
- tbl = alloc_tce_table();
- if (!tbl)
- goto cleanup;
- info->tce_space = tbl;
- calgary_found = 1;
- break;
- }
+ if (calgary_bus_has_devices(bus, pci_device) ||
+ translate_empty_slots) {
+ tbl = alloc_tce_table();
+ if (!tbl)
+ goto cleanup;
+ info->tce_space = tbl;
+ calgary_found = 1;
+ printk("Calg: allocated tce_table %p for bus 0x%x\n",
+ info->tce_space, bus);
}
}
--
1.4.4
-
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