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https://github.com/torvalds/linux
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56f5c0bd50
In pci_determine_mem_io_space(), do not hard code the region sizes. Instead, use the values given to us in the ranges property. Thanks goes to Mikael Petterson for the original Xorg failure bug repoert, and strace dumps from Mikael and Dmitry Artamonow. Signed-off-by: David S. Miller <davem@davemloft.net>
436 lines
10 KiB
C
436 lines
10 KiB
C
/* pci_common.c: PCI controller common support.
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*
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* Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
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*/
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/device.h>
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#include <asm/prom.h>
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#include <asm/of_device.h>
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#include <asm/oplib.h>
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#include "pci_impl.h"
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#include "pci_sun4v.h"
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static int config_out_of_range(struct pci_pbm_info *pbm,
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unsigned long bus,
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unsigned long devfn,
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unsigned long reg)
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{
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if (bus < pbm->pci_first_busno ||
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bus > pbm->pci_last_busno)
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return 1;
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return 0;
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}
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static void *sun4u_config_mkaddr(struct pci_pbm_info *pbm,
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unsigned long bus,
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unsigned long devfn,
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unsigned long reg)
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{
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unsigned long rbits = pbm->config_space_reg_bits;
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if (config_out_of_range(pbm, bus, devfn, reg))
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return NULL;
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reg = (reg & ((1 << rbits) - 1));
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devfn <<= rbits;
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bus <<= rbits + 8;
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return (void *) (pbm->config_space | bus | devfn | reg);
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}
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static int sun4u_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
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int where, int size, u32 *value)
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{
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struct pci_pbm_info *pbm = bus_dev->sysdata;
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unsigned char bus = bus_dev->number;
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u32 *addr;
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u16 tmp16;
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u8 tmp8;
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if (bus_dev == pbm->pci_bus && devfn == 0x00)
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return pci_host_bridge_read_pci_cfg(bus_dev, devfn, where,
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size, value);
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switch (size) {
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case 1:
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*value = 0xff;
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break;
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case 2:
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*value = 0xffff;
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break;
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case 4:
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*value = 0xffffffff;
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break;
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}
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addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
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if (!addr)
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return PCIBIOS_SUCCESSFUL;
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switch (size) {
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case 1:
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pci_config_read8((u8 *)addr, &tmp8);
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*value = (u32) tmp8;
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break;
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case 2:
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if (where & 0x01) {
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printk("pci_read_config_word: misaligned reg [%x]\n",
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where);
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return PCIBIOS_SUCCESSFUL;
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}
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pci_config_read16((u16 *)addr, &tmp16);
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*value = (u32) tmp16;
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break;
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case 4:
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if (where & 0x03) {
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printk("pci_read_config_dword: misaligned reg [%x]\n",
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where);
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return PCIBIOS_SUCCESSFUL;
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}
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pci_config_read32(addr, value);
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break;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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static int sun4u_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
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int where, int size, u32 value)
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{
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struct pci_pbm_info *pbm = bus_dev->sysdata;
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unsigned char bus = bus_dev->number;
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u32 *addr;
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if (bus_dev == pbm->pci_bus && devfn == 0x00)
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return pci_host_bridge_write_pci_cfg(bus_dev, devfn, where,
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size, value);
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addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
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if (!addr)
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return PCIBIOS_SUCCESSFUL;
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switch (size) {
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case 1:
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pci_config_write8((u8 *)addr, value);
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break;
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case 2:
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if (where & 0x01) {
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printk("pci_write_config_word: misaligned reg [%x]\n",
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where);
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return PCIBIOS_SUCCESSFUL;
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}
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pci_config_write16((u16 *)addr, value);
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break;
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case 4:
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if (where & 0x03) {
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printk("pci_write_config_dword: misaligned reg [%x]\n",
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where);
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return PCIBIOS_SUCCESSFUL;
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}
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pci_config_write32(addr, value);
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}
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops sun4u_pci_ops = {
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.read = sun4u_read_pci_cfg,
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.write = sun4u_write_pci_cfg,
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};
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static int sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
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int where, int size, u32 *value)
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{
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struct pci_pbm_info *pbm = bus_dev->sysdata;
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u32 devhandle = pbm->devhandle;
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unsigned int bus = bus_dev->number;
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unsigned int device = PCI_SLOT(devfn);
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unsigned int func = PCI_FUNC(devfn);
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unsigned long ret;
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if (bus_dev == pbm->pci_bus && devfn == 0x00)
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return pci_host_bridge_read_pci_cfg(bus_dev, devfn, where,
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size, value);
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if (config_out_of_range(pbm, bus, devfn, where)) {
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ret = ~0UL;
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} else {
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ret = pci_sun4v_config_get(devhandle,
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HV_PCI_DEVICE_BUILD(bus, device, func),
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where, size);
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}
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switch (size) {
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case 1:
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*value = ret & 0xff;
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break;
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case 2:
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*value = ret & 0xffff;
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break;
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case 4:
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*value = ret & 0xffffffff;
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break;
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};
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return PCIBIOS_SUCCESSFUL;
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}
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static int sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
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int where, int size, u32 value)
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{
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struct pci_pbm_info *pbm = bus_dev->sysdata;
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u32 devhandle = pbm->devhandle;
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unsigned int bus = bus_dev->number;
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unsigned int device = PCI_SLOT(devfn);
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unsigned int func = PCI_FUNC(devfn);
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unsigned long ret;
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if (bus_dev == pbm->pci_bus && devfn == 0x00)
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return pci_host_bridge_write_pci_cfg(bus_dev, devfn, where,
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size, value);
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if (config_out_of_range(pbm, bus, devfn, where)) {
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/* Do nothing. */
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} else {
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ret = pci_sun4v_config_put(devhandle,
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HV_PCI_DEVICE_BUILD(bus, device, func),
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where, size, value);
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}
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops sun4v_pci_ops = {
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.read = sun4v_read_pci_cfg,
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.write = sun4v_write_pci_cfg,
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};
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void pci_get_pbm_props(struct pci_pbm_info *pbm)
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{
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const u32 *val = of_get_property(pbm->prom_node, "bus-range", NULL);
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pbm->pci_first_busno = val[0];
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pbm->pci_last_busno = val[1];
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val = of_get_property(pbm->prom_node, "ino-bitmap", NULL);
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if (val) {
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pbm->ino_bitmap = (((u64)val[1] << 32UL) |
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((u64)val[0] << 0UL));
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}
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}
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static void pci_register_legacy_regions(struct resource *io_res,
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struct resource *mem_res)
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{
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struct resource *p;
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/* VGA Video RAM. */
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return;
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p->name = "Video RAM area";
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p->start = mem_res->start + 0xa0000UL;
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p->end = p->start + 0x1ffffUL;
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p->flags = IORESOURCE_BUSY;
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request_resource(mem_res, p);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return;
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p->name = "System ROM";
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p->start = mem_res->start + 0xf0000UL;
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p->end = p->start + 0xffffUL;
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p->flags = IORESOURCE_BUSY;
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request_resource(mem_res, p);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return;
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p->name = "Video ROM";
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p->start = mem_res->start + 0xc0000UL;
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p->end = p->start + 0x7fffUL;
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p->flags = IORESOURCE_BUSY;
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request_resource(mem_res, p);
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}
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static void pci_register_iommu_region(struct pci_pbm_info *pbm)
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{
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const u32 *vdma = of_get_property(pbm->prom_node, "virtual-dma", NULL);
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if (vdma) {
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struct resource *rp = kmalloc(sizeof(*rp), GFP_KERNEL);
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if (!rp) {
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prom_printf("Cannot allocate IOMMU resource.\n");
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prom_halt();
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}
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rp->name = "IOMMU";
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rp->start = pbm->mem_space.start + (unsigned long) vdma[0];
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rp->end = rp->start + (unsigned long) vdma[1] - 1UL;
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rp->flags = IORESOURCE_BUSY;
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request_resource(&pbm->mem_space, rp);
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}
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}
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void pci_determine_mem_io_space(struct pci_pbm_info *pbm)
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{
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const struct linux_prom_pci_ranges *pbm_ranges;
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int i, saw_mem, saw_io;
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int num_pbm_ranges;
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saw_mem = saw_io = 0;
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pbm_ranges = of_get_property(pbm->prom_node, "ranges", &i);
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num_pbm_ranges = i / sizeof(*pbm_ranges);
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for (i = 0; i < num_pbm_ranges; i++) {
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const struct linux_prom_pci_ranges *pr = &pbm_ranges[i];
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unsigned long a, size;
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u32 parent_phys_hi, parent_phys_lo;
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u32 size_hi, size_lo;
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int type;
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parent_phys_hi = pr->parent_phys_hi;
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parent_phys_lo = pr->parent_phys_lo;
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if (tlb_type == hypervisor)
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parent_phys_hi &= 0x0fffffff;
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size_hi = pr->size_hi;
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size_lo = pr->size_lo;
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type = (pr->child_phys_hi >> 24) & 0x3;
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a = (((unsigned long)parent_phys_hi << 32UL) |
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((unsigned long)parent_phys_lo << 0UL));
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size = (((unsigned long)size_hi << 32UL) |
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((unsigned long)size_lo << 0UL));
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switch (type) {
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case 0:
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/* PCI config space, 16MB */
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pbm->config_space = a;
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break;
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case 1:
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/* 16-bit IO space, 16MB */
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pbm->io_space.start = a;
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pbm->io_space.end = a + size - 1UL;
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pbm->io_space.flags = IORESOURCE_IO;
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saw_io = 1;
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break;
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case 2:
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/* 32-bit MEM space, 2GB */
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pbm->mem_space.start = a;
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pbm->mem_space.end = a + size - 1UL;
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pbm->mem_space.flags = IORESOURCE_MEM;
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saw_mem = 1;
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break;
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case 3:
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/* XXX 64-bit MEM handling XXX */
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default:
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break;
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};
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}
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if (!saw_io || !saw_mem) {
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prom_printf("%s: Fatal error, missing %s PBM range.\n",
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pbm->name,
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(!saw_io ? "IO" : "MEM"));
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prom_halt();
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}
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printk("%s: PCI IO[%lx] MEM[%lx]\n",
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pbm->name,
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pbm->io_space.start,
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pbm->mem_space.start);
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pbm->io_space.name = pbm->mem_space.name = pbm->name;
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request_resource(&ioport_resource, &pbm->io_space);
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request_resource(&iomem_resource, &pbm->mem_space);
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pci_register_legacy_regions(&pbm->io_space,
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&pbm->mem_space);
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pci_register_iommu_region(pbm);
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}
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/* Generic helper routines for PCI error reporting. */
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void pci_scan_for_target_abort(struct pci_pbm_info *pbm,
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struct pci_bus *pbus)
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{
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struct pci_dev *pdev;
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struct pci_bus *bus;
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list_for_each_entry(pdev, &pbus->devices, bus_list) {
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u16 status, error_bits;
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pci_read_config_word(pdev, PCI_STATUS, &status);
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error_bits =
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(status & (PCI_STATUS_SIG_TARGET_ABORT |
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PCI_STATUS_REC_TARGET_ABORT));
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if (error_bits) {
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pci_write_config_word(pdev, PCI_STATUS, error_bits);
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printk("%s: Device %s saw Target Abort [%016x]\n",
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pbm->name, pci_name(pdev), status);
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}
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}
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list_for_each_entry(bus, &pbus->children, node)
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pci_scan_for_target_abort(pbm, bus);
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}
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void pci_scan_for_master_abort(struct pci_pbm_info *pbm,
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struct pci_bus *pbus)
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{
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struct pci_dev *pdev;
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struct pci_bus *bus;
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list_for_each_entry(pdev, &pbus->devices, bus_list) {
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u16 status, error_bits;
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pci_read_config_word(pdev, PCI_STATUS, &status);
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error_bits =
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(status & (PCI_STATUS_REC_MASTER_ABORT));
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if (error_bits) {
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pci_write_config_word(pdev, PCI_STATUS, error_bits);
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printk("%s: Device %s received Master Abort [%016x]\n",
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pbm->name, pci_name(pdev), status);
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}
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}
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list_for_each_entry(bus, &pbus->children, node)
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pci_scan_for_master_abort(pbm, bus);
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}
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void pci_scan_for_parity_error(struct pci_pbm_info *pbm,
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struct pci_bus *pbus)
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{
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struct pci_dev *pdev;
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struct pci_bus *bus;
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list_for_each_entry(pdev, &pbus->devices, bus_list) {
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u16 status, error_bits;
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pci_read_config_word(pdev, PCI_STATUS, &status);
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error_bits =
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(status & (PCI_STATUS_PARITY |
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PCI_STATUS_DETECTED_PARITY));
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if (error_bits) {
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pci_write_config_word(pdev, PCI_STATUS, error_bits);
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printk("%s: Device %s saw Parity Error [%016x]\n",
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pbm->name, pci_name(pdev), status);
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}
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}
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list_for_each_entry(bus, &pbus->children, node)
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pci_scan_for_parity_error(pbm, bus);
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}
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