From d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 02:45:28 +0000
Subject: [PATCH] add boot partition size
---
kernel/arch/s390/pci/pci.c | 778 +++++++++++++++++++++++++++++------------------------------
1 files changed, 378 insertions(+), 400 deletions(-)
diff --git a/kernel/arch/s390/pci/pci.c b/kernel/arch/s390/pci/pci.c
index 9f6f392..7479943 100644
--- a/kernel/arch/s390/pci/pci.c
+++ b/kernel/arch/s390/pci/pci.c
@@ -24,11 +24,10 @@
#include <linux/err.h>
#include <linux/export.h>
#include <linux/delay.h>
-#include <linux/irq.h>
-#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
+#include <linux/jump_label.h>
#include <linux/pci.h>
-#include <linux/msi.h>
+#include <linux/printk.h>
#include <asm/isc.h>
#include <asm/airq.h>
@@ -37,38 +36,28 @@
#include <asm/pci_clp.h>
#include <asm/pci_dma.h>
-#define DEBUG /* enable pr_debug */
-
-#define SIC_IRQ_MODE_ALL 0
-#define SIC_IRQ_MODE_SINGLE 1
-
-#define ZPCI_NR_DMA_SPACES 1
-#define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
+#include "pci_bus.h"
+#include "pci_iov.h"
/* list of all detected zpci devices */
static LIST_HEAD(zpci_list);
static DEFINE_SPINLOCK(zpci_list_lock);
-static struct irq_chip zpci_irq_chip = {
- .name = "zPCI",
- .irq_unmask = pci_msi_unmask_irq,
- .irq_mask = pci_msi_mask_irq,
-};
-
-static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
+static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
static DEFINE_SPINLOCK(zpci_domain_lock);
-static struct airq_iv *zpci_aisb_iv;
-static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
-
#define ZPCI_IOMAP_ENTRIES \
- min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2), \
+ min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \
ZPCI_IOMAP_MAX_ENTRIES)
+
+unsigned int s390_pci_no_rid;
static DEFINE_SPINLOCK(zpci_iomap_lock);
static unsigned long *zpci_iomap_bitmap;
struct zpci_iomap_entry *zpci_iomap_start;
EXPORT_SYMBOL_GPL(zpci_iomap_start);
+
+DEFINE_STATIC_KEY_FALSE(have_mio);
static struct kmem_cache *zdev_fmb_cache;
@@ -80,6 +69,7 @@
list_for_each_entry(tmp, &zpci_list, entry) {
if (tmp->fid == fid) {
zdev = tmp;
+ zpci_zdev_get(zdev);
break;
}
}
@@ -103,17 +93,12 @@
spin_unlock(&zpci_list_lock);
list_for_each_entry_safe(zdev, tmp, &remove, entry)
- zpci_remove_device(zdev);
-}
-
-static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
-{
- return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
+ zpci_device_reserved(zdev);
}
int pci_domain_nr(struct pci_bus *bus)
{
- return ((struct zpci_dev *) bus->sysdata)->domain;
+ return ((struct zpci_bus *) bus->sysdata)->domain_nr;
}
EXPORT_SYMBOL_GPL(pci_domain_nr);
@@ -122,39 +107,6 @@
return pci_domain_nr(bus);
}
EXPORT_SYMBOL_GPL(pci_proc_domain);
-
-/* Modify PCI: Register adapter interruptions */
-static int zpci_set_airq(struct zpci_dev *zdev)
-{
- u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
- struct zpci_fib fib = {0};
- u8 status;
-
- fib.isc = PCI_ISC;
- fib.sum = 1; /* enable summary notifications */
- fib.noi = airq_iv_end(zdev->aibv);
- fib.aibv = (unsigned long) zdev->aibv->vector;
- fib.aibvo = 0; /* each zdev has its own interrupt vector */
- fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
- fib.aisbo = zdev->aisb & 63;
-
- return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
-}
-
-/* Modify PCI: Unregister adapter interruptions */
-static int zpci_clear_airq(struct zpci_dev *zdev)
-{
- u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
- struct zpci_fib fib = {0};
- u8 cc, status;
-
- cc = zpci_mod_fc(req, &fib, &status);
- if (cc == 3 || (cc == 1 && status == 24))
- /* Function already gone or IRQs already deregistered. */
- cc = 0;
-
- return cc ? -EIO : 0;
-}
/* Modify PCI: Register I/O address translation parameters */
int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
@@ -241,7 +193,7 @@
u64 data;
int rc;
- rc = zpci_load(&data, req, offset);
+ rc = __zpci_load(&data, req, offset);
if (!rc) {
data = le64_to_cpu((__force __le64) data);
data >>= (8 - len) * 8;
@@ -259,7 +211,7 @@
data <<= (8 - len) * 8;
data = (__force u64) cpu_to_le64(data);
- rc = zpci_store(data, req, offset);
+ rc = __zpci_store(data, req, offset);
return rc;
}
@@ -276,17 +228,71 @@
zpci_memcpy_toio(to, from, count);
}
+static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
+{
+ unsigned long offset, vaddr;
+ struct vm_struct *area;
+ phys_addr_t last_addr;
+
+ last_addr = addr + size - 1;
+ if (!size || last_addr < addr)
+ return NULL;
+
+ if (!static_branch_unlikely(&have_mio))
+ return (void __iomem *) addr;
+
+ offset = addr & ~PAGE_MASK;
+ addr &= PAGE_MASK;
+ size = PAGE_ALIGN(size + offset);
+ area = get_vm_area(size, VM_IOREMAP);
+ if (!area)
+ return NULL;
+
+ vaddr = (unsigned long) area->addr;
+ if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
+ free_vm_area(area);
+ return NULL;
+ }
+ return (void __iomem *) ((unsigned long) area->addr + offset);
+}
+
+void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
+{
+ return __ioremap(addr, size, __pgprot(prot));
+}
+EXPORT_SYMBOL(ioremap_prot);
+
+void __iomem *ioremap(phys_addr_t addr, size_t size)
+{
+ return __ioremap(addr, size, PAGE_KERNEL);
+}
+EXPORT_SYMBOL(ioremap);
+
+void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
+{
+ return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
+}
+EXPORT_SYMBOL(ioremap_wc);
+
+void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
+{
+ return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
+}
+EXPORT_SYMBOL(ioremap_wt);
+
+void iounmap(volatile void __iomem *addr)
+{
+ if (static_branch_likely(&have_mio))
+ vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
+}
+EXPORT_SYMBOL(iounmap);
+
/* Create a virtual mapping cookie for a PCI BAR */
-void __iomem *pci_iomap_range(struct pci_dev *pdev,
- int bar,
- unsigned long offset,
- unsigned long max)
+static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long max)
{
struct zpci_dev *zdev = to_zpci(pdev);
int idx;
-
- if (!pci_resource_len(pdev, bar))
- return NULL;
idx = zdev->bars[bar].map_idx;
spin_lock(&zpci_iomap_lock);
@@ -298,6 +304,30 @@
return (void __iomem *) ZPCI_ADDR(idx) + offset;
}
+
+static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
+ unsigned long offset,
+ unsigned long max)
+{
+ unsigned long barsize = pci_resource_len(pdev, bar);
+ struct zpci_dev *zdev = to_zpci(pdev);
+ void __iomem *iova;
+
+ iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
+ return iova ? iova + offset : iova;
+}
+
+void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long max)
+{
+ if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
+ return NULL;
+
+ if (static_branch_likely(&have_mio))
+ return pci_iomap_range_mio(pdev, bar, offset, max);
+ else
+ return pci_iomap_range_fh(pdev, bar, offset, max);
+}
EXPORT_SYMBOL(pci_iomap_range);
void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
@@ -306,7 +336,37 @@
}
EXPORT_SYMBOL(pci_iomap);
-void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
+static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long max)
+{
+ unsigned long barsize = pci_resource_len(pdev, bar);
+ struct zpci_dev *zdev = to_zpci(pdev);
+ void __iomem *iova;
+
+ iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
+ return iova ? iova + offset : iova;
+}
+
+void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long max)
+{
+ if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
+ return NULL;
+
+ if (static_branch_likely(&have_mio))
+ return pci_iomap_wc_range_mio(pdev, bar, offset, max);
+ else
+ return pci_iomap_range_fh(pdev, bar, offset, max);
+}
+EXPORT_SYMBOL(pci_iomap_wc_range);
+
+void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+ return pci_iomap_wc_range(dev, bar, 0, maxlen);
+}
+EXPORT_SYMBOL(pci_iomap_wc);
+
+static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
{
unsigned int idx = ZPCI_IDX(addr);
@@ -319,34 +379,35 @@
}
spin_unlock(&zpci_iomap_lock);
}
+
+static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
+{
+ iounmap(addr);
+}
+
+void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
+{
+ if (static_branch_likely(&have_mio))
+ pci_iounmap_mio(pdev, addr);
+ else
+ pci_iounmap_fh(pdev, addr);
+}
EXPORT_SYMBOL(pci_iounmap);
static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *val)
{
- struct zpci_dev *zdev = get_zdev_by_bus(bus);
- int ret;
+ struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
- if (!zdev || devfn != ZPCI_DEVFN)
- ret = -ENODEV;
- else
- ret = zpci_cfg_load(zdev, where, val, size);
-
- return ret;
+ return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
}
static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 val)
{
- struct zpci_dev *zdev = get_zdev_by_bus(bus);
- int ret;
+ struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
- if (!zdev || devfn != ZPCI_DEVFN)
- ret = -ENODEV;
- else
- ret = zpci_cfg_store(zdev, where, val, size);
-
- return ret;
+ return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
}
static struct pci_ops pci_root_ops = {
@@ -354,198 +415,45 @@
.write = pci_write,
};
-static void zpci_irq_handler(struct airq_struct *airq)
-{
- unsigned long si, ai;
- struct airq_iv *aibv;
- int irqs_on = 0;
-
- inc_irq_stat(IRQIO_PCI);
- for (si = 0;;) {
- /* Scan adapter summary indicator bit vector */
- si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
- if (si == -1UL) {
- if (irqs_on++)
- /* End of second scan with interrupts on. */
- break;
- /* First scan complete, reenable interrupts. */
- if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC))
- break;
- si = 0;
- continue;
- }
-
- /* Scan the adapter interrupt vector for this device. */
- aibv = zpci_aibv[si];
- for (ai = 0;;) {
- ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
- if (ai == -1UL)
- break;
- inc_irq_stat(IRQIO_MSI);
- airq_iv_lock(aibv, ai);
- generic_handle_irq(airq_iv_get_data(aibv, ai));
- airq_iv_unlock(aibv, ai);
- }
- }
-}
-
-int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
-{
- struct zpci_dev *zdev = to_zpci(pdev);
- unsigned int hwirq, msi_vecs;
- unsigned long aisb;
- struct msi_desc *msi;
- struct msi_msg msg;
- int rc, irq;
-
- zdev->aisb = -1UL;
- if (type == PCI_CAP_ID_MSI && nvec > 1)
- return 1;
- msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
-
- /* Allocate adapter summary indicator bit */
- aisb = airq_iv_alloc_bit(zpci_aisb_iv);
- if (aisb == -1UL)
- return -EIO;
- zdev->aisb = aisb;
-
- /* Create adapter interrupt vector */
- zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
- if (!zdev->aibv)
- return -ENOMEM;
-
- /* Wire up shortcut pointer */
- zpci_aibv[aisb] = zdev->aibv;
-
- /* Request MSI interrupts */
- hwirq = 0;
- for_each_pci_msi_entry(msi, pdev) {
- if (hwirq >= msi_vecs)
- break;
- irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
- if (irq < 0)
- return -ENOMEM;
- rc = irq_set_msi_desc(irq, msi);
- if (rc)
- return rc;
- irq_set_chip_and_handler(irq, &zpci_irq_chip,
- handle_simple_irq);
- msg.data = hwirq;
- msg.address_lo = zdev->msi_addr & 0xffffffff;
- msg.address_hi = zdev->msi_addr >> 32;
- pci_write_msi_msg(irq, &msg);
- airq_iv_set_data(zdev->aibv, hwirq, irq);
- hwirq++;
- }
-
- /* Enable adapter interrupts */
- rc = zpci_set_airq(zdev);
- if (rc)
- return rc;
-
- return (msi_vecs == nvec) ? 0 : msi_vecs;
-}
-
-void arch_teardown_msi_irqs(struct pci_dev *pdev)
-{
- struct zpci_dev *zdev = to_zpci(pdev);
- struct msi_desc *msi;
- int rc;
-
- /* Disable adapter interrupts */
- rc = zpci_clear_airq(zdev);
- if (rc)
- return;
-
- /* Release MSI interrupts */
- for_each_pci_msi_entry(msi, pdev) {
- if (!msi->irq)
- continue;
- if (msi->msi_attrib.is_msix)
- __pci_msix_desc_mask_irq(msi, 1);
- else
- __pci_msi_desc_mask_irq(msi, 1, 1);
- irq_set_msi_desc(msi->irq, NULL);
- irq_free_desc(msi->irq);
- msi->msg.address_lo = 0;
- msi->msg.address_hi = 0;
- msi->msg.data = 0;
- msi->irq = 0;
- }
-
- if (zdev->aisb != -1UL) {
- zpci_aibv[zdev->aisb] = NULL;
- airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
- zdev->aisb = -1UL;
- }
- if (zdev->aibv) {
- airq_iv_release(zdev->aibv);
- zdev->aibv = NULL;
- }
-}
-
static void zpci_map_resources(struct pci_dev *pdev)
{
+ struct zpci_dev *zdev = to_zpci(pdev);
resource_size_t len;
int i;
- for (i = 0; i < PCI_BAR_COUNT; i++) {
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
len = pci_resource_len(pdev, i);
if (!len)
continue;
- pdev->resource[i].start =
- (resource_size_t __force) pci_iomap(pdev, i, 0);
+
+ if (zpci_use_mio(zdev))
+ pdev->resource[i].start =
+ (resource_size_t __force) zdev->bars[i].mio_wt;
+ else
+ pdev->resource[i].start = (resource_size_t __force)
+ pci_iomap_range_fh(pdev, i, 0, 0);
pdev->resource[i].end = pdev->resource[i].start + len - 1;
}
+
+ zpci_iov_map_resources(pdev);
}
static void zpci_unmap_resources(struct pci_dev *pdev)
{
+ struct zpci_dev *zdev = to_zpci(pdev);
resource_size_t len;
int i;
- for (i = 0; i < PCI_BAR_COUNT; i++) {
+ if (zpci_use_mio(zdev))
+ return;
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
len = pci_resource_len(pdev, i);
if (!len)
continue;
- pci_iounmap(pdev, (void __iomem __force *)
- pdev->resource[i].start);
+ pci_iounmap_fh(pdev, (void __iomem __force *)
+ pdev->resource[i].start);
}
-}
-
-static struct airq_struct zpci_airq = {
- .handler = zpci_irq_handler,
- .isc = PCI_ISC,
-};
-
-static int __init zpci_irq_init(void)
-{
- int rc;
-
- rc = register_adapter_interrupt(&zpci_airq);
- if (rc)
- goto out;
- /* Set summary to 1 to be called every time for the ISC. */
- *zpci_airq.lsi_ptr = 1;
-
- rc = -ENOMEM;
- zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
- if (!zpci_aisb_iv)
- goto out_airq;
-
- zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
- return 0;
-
-out_airq:
- unregister_adapter_interrupt(&zpci_airq);
-out:
- return rc;
-}
-
-static void zpci_irq_exit(void)
-{
- airq_iv_release(zpci_aisb_iv);
- unregister_adapter_interrupt(&zpci_airq);
}
static int zpci_alloc_iomap(struct zpci_dev *zdev)
@@ -592,17 +500,17 @@
return r;
}
-static int zpci_setup_bus_resources(struct zpci_dev *zdev,
- struct list_head *resources)
+int zpci_setup_bus_resources(struct zpci_dev *zdev,
+ struct list_head *resources)
{
unsigned long addr, size, flags;
struct resource *res;
int i, entry;
snprintf(zdev->res_name, sizeof(zdev->res_name),
- "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
+ "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
- for (i = 0; i < PCI_BAR_COUNT; i++) {
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
if (!zdev->bars[i].size)
continue;
entry = zpci_alloc_iomap(zdev);
@@ -617,7 +525,10 @@
if (zdev->bars[i].val & 4)
flags |= IORESOURCE_MEM_64;
- addr = ZPCI_ADDR(entry);
+ if (zpci_use_mio(zdev))
+ addr = (unsigned long) zdev->bars[i].mio_wt;
+ else
+ addr = ZPCI_ADDR(entry);
size = 1UL << zdev->bars[i].size;
res = __alloc_res(zdev, addr, size, flags);
@@ -636,7 +547,7 @@
{
int i;
- for (i = 0; i < PCI_BAR_COUNT; i++) {
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
if (!zdev->bars[i].size || !zdev->bars[i].res)
continue;
@@ -648,14 +559,20 @@
int pcibios_add_device(struct pci_dev *pdev)
{
+ struct zpci_dev *zdev = to_zpci(pdev);
struct resource *res;
int i;
+
+ /* The pdev has a reference to the zdev via its bus */
+ zpci_zdev_get(zdev);
+ if (pdev->is_physfn)
+ pdev->no_vf_scan = 1;
pdev->dev.groups = zpci_attr_groups;
pdev->dev.dma_ops = &s390_pci_dma_ops;
zpci_map_resources(pdev);
- for (i = 0; i < PCI_BAR_COUNT; i++) {
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
res = &pdev->resource[i];
if (res->parent || !res->flags)
continue;
@@ -667,7 +584,10 @@
void pcibios_release_device(struct pci_dev *pdev)
{
+ struct zpci_dev *zdev = to_zpci(pdev);
+
zpci_unmap_resources(pdev);
+ zpci_zdev_put(zdev);
}
int pcibios_enable_device(struct pci_dev *pdev, int mask)
@@ -688,136 +608,62 @@
zpci_debug_exit_device(zdev);
}
-#ifdef CONFIG_HIBERNATE_CALLBACKS
-static int zpci_restore(struct device *dev)
+static int __zpci_register_domain(int domain)
{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct zpci_dev *zdev = to_zpci(pdev);
- int ret = 0;
-
- if (zdev->state != ZPCI_FN_STATE_ONLINE)
- goto out;
-
- ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
- if (ret)
- goto out;
-
- zpci_map_resources(pdev);
- zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
- (u64) zdev->dma_table);
-
-out:
- return ret;
+ spin_lock(&zpci_domain_lock);
+ if (test_bit(domain, zpci_domain)) {
+ spin_unlock(&zpci_domain_lock);
+ pr_err("Domain %04x is already assigned\n", domain);
+ return -EEXIST;
+ }
+ set_bit(domain, zpci_domain);
+ spin_unlock(&zpci_domain_lock);
+ return domain;
}
-static int zpci_freeze(struct device *dev)
+static int __zpci_alloc_domain(void)
{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct zpci_dev *zdev = to_zpci(pdev);
+ int domain;
- if (zdev->state != ZPCI_FN_STATE_ONLINE)
- return 0;
-
- zpci_unregister_ioat(zdev, 0);
- zpci_unmap_resources(pdev);
- return clp_disable_fh(zdev);
+ spin_lock(&zpci_domain_lock);
+ /*
+ * We can always auto allocate domains below ZPCI_NR_DEVICES.
+ * There is either a free domain or we have reached the maximum in
+ * which case we would have bailed earlier.
+ */
+ domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
+ set_bit(domain, zpci_domain);
+ spin_unlock(&zpci_domain_lock);
+ return domain;
}
-struct dev_pm_ops pcibios_pm_ops = {
- .thaw_noirq = zpci_restore,
- .freeze_noirq = zpci_freeze,
- .restore_noirq = zpci_restore,
- .poweroff_noirq = zpci_freeze,
-};
-#endif /* CONFIG_HIBERNATE_CALLBACKS */
-
-static int zpci_alloc_domain(struct zpci_dev *zdev)
+int zpci_alloc_domain(int domain)
{
if (zpci_unique_uid) {
- zdev->domain = (u16) zdev->uid;
- if (zdev->domain >= ZPCI_NR_DEVICES)
- return 0;
-
- spin_lock(&zpci_domain_lock);
- if (test_bit(zdev->domain, zpci_domain)) {
- spin_unlock(&zpci_domain_lock);
- return -EEXIST;
- }
- set_bit(zdev->domain, zpci_domain);
- spin_unlock(&zpci_domain_lock);
- return 0;
+ if (domain)
+ return __zpci_register_domain(domain);
+ pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
+ update_uid_checking(false);
}
-
- spin_lock(&zpci_domain_lock);
- zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
- if (zdev->domain == ZPCI_NR_DEVICES) {
- spin_unlock(&zpci_domain_lock);
- return -ENOSPC;
- }
- set_bit(zdev->domain, zpci_domain);
- spin_unlock(&zpci_domain_lock);
- return 0;
+ return __zpci_alloc_domain();
}
-static void zpci_free_domain(struct zpci_dev *zdev)
+void zpci_free_domain(int domain)
{
- if (zdev->domain >= ZPCI_NR_DEVICES)
- return;
-
spin_lock(&zpci_domain_lock);
- clear_bit(zdev->domain, zpci_domain);
+ clear_bit(domain, zpci_domain);
spin_unlock(&zpci_domain_lock);
}
-void pcibios_remove_bus(struct pci_bus *bus)
-{
- struct zpci_dev *zdev = get_zdev_by_bus(bus);
-
- zpci_exit_slot(zdev);
- zpci_cleanup_bus_resources(zdev);
- zpci_destroy_iommu(zdev);
- zpci_free_domain(zdev);
-
- spin_lock(&zpci_list_lock);
- list_del(&zdev->entry);
- spin_unlock(&zpci_list_lock);
-
- zpci_dbg(3, "rem fid:%x\n", zdev->fid);
- kfree(zdev);
-}
-
-static int zpci_scan_bus(struct zpci_dev *zdev)
-{
- LIST_HEAD(resources);
- int ret;
-
- ret = zpci_setup_bus_resources(zdev, &resources);
- if (ret)
- goto error;
-
- zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
- zdev, &resources);
- if (!zdev->bus) {
- ret = -EIO;
- goto error;
- }
- zdev->bus->max_bus_speed = zdev->max_bus_speed;
- pci_bus_add_devices(zdev->bus);
- return 0;
-
-error:
- zpci_cleanup_bus_resources(zdev);
- pci_free_resource_list(&resources);
- return ret;
-}
int zpci_enable_device(struct zpci_dev *zdev)
{
int rc;
- rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
- if (rc)
+ if (clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES)) {
+ rc = -EIO;
goto out;
+ }
rc = zpci_dma_init_device(zdev);
if (rc)
@@ -836,58 +682,175 @@
int zpci_disable_device(struct zpci_dev *zdev)
{
zpci_dma_exit_device(zdev);
- return clp_disable_fh(zdev);
+ /*
+ * The zPCI function may already be disabled by the platform, this is
+ * detected in clp_disable_fh() which becomes a no-op.
+ */
+ return clp_disable_fh(zdev) ? -EIO : 0;
}
EXPORT_SYMBOL_GPL(zpci_disable_device);
-int zpci_create_device(struct zpci_dev *zdev)
+/* zpci_remove_device - Removes the given zdev from the PCI core
+ * @zdev: the zdev to be removed from the PCI core
+ * @set_error: if true the device's error state is set to permanent failure
+ *
+ * Sets a zPCI device to a configured but offline state; the zPCI
+ * device is still accessible through its hotplug slot and the zPCI
+ * API but is removed from the common code PCI bus, making it
+ * no longer available to drivers.
+ */
+void zpci_remove_device(struct zpci_dev *zdev, bool set_error)
{
+ struct zpci_bus *zbus = zdev->zbus;
+ struct pci_dev *pdev;
+
+ if (!zdev->zbus->bus)
+ return;
+
+ pdev = pci_get_slot(zbus->bus, zdev->devfn);
+ if (pdev) {
+ if (set_error)
+ pdev->error_state = pci_channel_io_perm_failure;
+ if (pdev->is_virtfn) {
+ zpci_iov_remove_virtfn(pdev, zdev->vfn);
+ /* balance pci_get_slot */
+ pci_dev_put(pdev);
+ return;
+ }
+ pci_stop_and_remove_bus_device_locked(pdev);
+ /* balance pci_get_slot */
+ pci_dev_put(pdev);
+ }
+}
+
+/**
+ * zpci_create_device() - Create a new zpci_dev and add it to the zbus
+ * @fid: Function ID of the device to be created
+ * @fh: Current Function Handle of the device to be created
+ * @state: Initial state after creation either Standby or Configured
+ *
+ * Creates a new zpci device and adds it to its, possibly newly created, zbus
+ * as well as zpci_list.
+ *
+ * Returns: 0 on success, an error value otherwise
+ */
+int zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
+{
+ struct zpci_dev *zdev;
int rc;
- rc = zpci_alloc_domain(zdev);
+ zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
+ zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
+ if (!zdev)
+ return -ENOMEM;
+
+ /* FID and Function Handle are the static/dynamic identifiers */
+ zdev->fid = fid;
+ zdev->fh = fh;
+
+ /* Query function properties and update zdev */
+ rc = clp_query_pci_fn(zdev);
if (rc)
- goto out;
+ goto error;
+ zdev->state = state;
+
+ kref_init(&zdev->kref);
+ mutex_init(&zdev->lock);
rc = zpci_init_iommu(zdev);
if (rc)
- goto out_free;
+ goto error;
- mutex_init(&zdev->lock);
if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
rc = zpci_enable_device(zdev);
if (rc)
- goto out_destroy_iommu;
+ goto error_destroy_iommu;
}
- rc = zpci_scan_bus(zdev);
+
+ rc = zpci_bus_device_register(zdev, &pci_root_ops);
if (rc)
- goto out_disable;
+ goto error_disable;
spin_lock(&zpci_list_lock);
list_add_tail(&zdev->entry, &zpci_list);
spin_unlock(&zpci_list_lock);
- zpci_init_slot(zdev);
-
return 0;
-out_disable:
+error_disable:
if (zdev->state == ZPCI_FN_STATE_ONLINE)
zpci_disable_device(zdev);
-out_destroy_iommu:
+error_destroy_iommu:
zpci_destroy_iommu(zdev);
-out_free:
- zpci_free_domain(zdev);
-out:
+error:
+ zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
+ kfree(zdev);
return rc;
}
-void zpci_remove_device(struct zpci_dev *zdev)
+bool zpci_is_device_configured(struct zpci_dev *zdev)
{
- if (!zdev->bus)
- return;
+ enum zpci_state state = zdev->state;
- pci_stop_root_bus(zdev->bus);
- pci_remove_root_bus(zdev->bus);
+ return state != ZPCI_FN_STATE_RESERVED &&
+ state != ZPCI_FN_STATE_STANDBY;
+}
+
+/**
+ * zpci_device_reserved() - Mark device as resverved
+ * @zdev: the zpci_dev that was reserved
+ *
+ * Handle the case that a given zPCI function was reserved by another system.
+ * After a call to this function the zpci_dev can not be found via
+ * get_zdev_by_fid() anymore but may still be accessible via existing
+ * references though it will not be functional anymore.
+ */
+void zpci_device_reserved(struct zpci_dev *zdev)
+{
+ if (zdev->has_hp_slot)
+ zpci_exit_slot(zdev);
+ /*
+ * Remove device from zpci_list as it is going away. This also
+ * makes sure we ignore subsequent zPCI events for this device.
+ */
+ spin_lock(&zpci_list_lock);
+ list_del(&zdev->entry);
+ spin_unlock(&zpci_list_lock);
+ zdev->state = ZPCI_FN_STATE_RESERVED;
+ zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
+ zpci_zdev_put(zdev);
+}
+
+void zpci_release_device(struct kref *kref)
+{
+ struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
+
+ if (zdev->zbus->bus)
+ zpci_remove_device(zdev, false);
+
+ switch (zdev->state) {
+ case ZPCI_FN_STATE_ONLINE:
+ case ZPCI_FN_STATE_CONFIGURED:
+ zpci_disable_device(zdev);
+ fallthrough;
+ case ZPCI_FN_STATE_STANDBY:
+ if (zdev->has_hp_slot)
+ zpci_exit_slot(zdev);
+ spin_lock(&zpci_list_lock);
+ list_del(&zdev->entry);
+ spin_unlock(&zpci_list_lock);
+ zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
+ fallthrough;
+ case ZPCI_FN_STATE_RESERVED:
+ zpci_cleanup_bus_resources(zdev);
+ zpci_bus_device_unregister(zdev);
+ zpci_destroy_iommu(zdev);
+ fallthrough;
+ default:
+ break;
+ }
+ zpci_dbg(3, "rem fid:%x\n", zdev->fid);
+ kfree(zdev);
}
int zpci_report_error(struct pci_dev *pdev,
@@ -919,6 +882,9 @@
if (!zpci_iomap_bitmap)
goto error_iomap_bitmap;
+ if (static_branch_likely(&have_mio))
+ clp_setup_writeback_mio();
+
return 0;
error_iomap_bitmap:
kfree(zpci_iomap_start);
@@ -935,13 +901,26 @@
kmem_cache_destroy(zdev_fmb_cache);
}
-static unsigned int s390_pci_probe = 1;
+static unsigned int s390_pci_probe __initdata = 1;
+unsigned int s390_pci_force_floating __initdata;
static unsigned int s390_pci_initialized;
char * __init pcibios_setup(char *str)
{
if (!strcmp(str, "off")) {
s390_pci_probe = 0;
+ return NULL;
+ }
+ if (!strcmp(str, "nomio")) {
+ S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
+ return NULL;
+ }
+ if (!strcmp(str, "force_floating")) {
+ s390_pci_force_floating = 1;
+ return NULL;
+ }
+ if (!strcmp(str, "norid")) {
+ s390_pci_no_rid = 1;
return NULL;
}
return str;
@@ -961,6 +940,11 @@
if (!test_facility(69) || !test_facility(71))
return 0;
+
+ if (MACHINE_HAS_PCI_MIO) {
+ static_branch_enable(&have_mio);
+ ctl_set_bit(2, 5);
+ }
rc = zpci_debug_init();
if (rc)
@@ -997,9 +981,3 @@
return rc;
}
subsys_initcall_sync(pci_base_init);
-
-void zpci_rescan(void)
-{
- if (zpci_is_enabled())
- clp_rescan_pci_devices_simple();
-}
--
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