Re: [PATCH v3 4/9] x86, pci, acpi: Move arch-agnostic MMCONFIG (aka ECAM) and ACPI code out of arch/x86/ directory

Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx> · Mon, 16 Mar 2015 15:38:17 +0100

On 13.03.2015 17:35, Mark Salter wrote:
On Tue, 2015-03-10 at 12:35 +0100, Tomasz Nowicki wrote:
ECAM standard and MCFG table are architecture independent and it makes
sense to share common code across all architectures. Both are going to
corresponding files - ecam.c and mcfg.c

While we are here, rename pci_parse_mcfg to acpi_parse_mcfg.
We already have acpi_parse_mcfg prototype which is used nowhere.
At the same time, we need pci_parse_mcfg been global so acpi_parse_mcfg
can be used perfectly here.

Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
---
  arch/x86/Kconfig               |   2 +
  arch/x86/include/asm/pci_x86.h |  33 -----
  arch/x86/pci/acpi.c            |   1 +
  arch/x86/pci/mmconfig-shared.c | 296 +----------------------------------------
  arch/x86/pci/mmconfig_32.c     |   1 +
  arch/x86/pci/mmconfig_64.c     |   1 +
  arch/x86/pci/numachip.c        |   1 +
  drivers/acpi/Makefile          |   1 +
  drivers/acpi/mcfg.c            |  81 +++++++++++
  drivers/pci/Kconfig            |   4 +
  drivers/pci/Makefile           |   5 +
  drivers/pci/ecam.c             | 243 +++++++++++++++++++++++++++++++++
  include/linux/ecam.h           |  51 +++++++
  13 files changed, 394 insertions(+), 326 deletions(-)
  create mode 100644 drivers/acpi/mcfg.c
  create mode 100644 drivers/pci/ecam.c
  create mode 100644 include/linux/ecam.h

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c2fb8a8..dd926f4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2276,6 +2276,7 @@ config PCI_DIRECT

  config PCI_MMCONFIG
  	def_bool y
+	select PCI_ECAM
  	depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)

  config PCI_OLPC
@@ -2293,6 +2294,7 @@ config PCI_DOMAINS

  config PCI_MMCONFIG
  	bool "Support mmconfig PCI config space access"
+	select PCI_ECAM
  	depends on X86_64 && PCI && ACPI

  config PCI_CNB20LE_QUIRK
diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index c57c225..e8a237f 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -122,41 +122,8 @@ extern int pci_legacy_init(void);
  extern void pcibios_fixup_irqs(void);

  /* pci-mmconfig.c */
-
-/* "PCI MMCONFIG %04x [bus %02x-%02x]" */
-#define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
-
-struct pci_mmcfg_region {
-	struct list_head list;
-	struct resource res;
-	u64 address;
-	char __iomem *virt;
-	u16 segment;
-	u8 start_bus;
-	u8 end_bus;
-	char name[PCI_MMCFG_RESOURCE_NAME_LEN];
-};
-
-struct pci_mmcfg_mmio_ops {
-	u32 (*read)(int len, void __iomem *addr);
-	void (*write)(int len, void __iomem *addr, u32 value);
-};
-
-extern int __init pci_mmcfg_arch_init(void);
-extern void __init pci_mmcfg_arch_free(void);
-extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
-extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
  extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
  			       phys_addr_t addr);
-extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
-extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
-extern u32 pci_mmio_read(int len, void __iomem *addr);
-extern void pci_mmio_write(int len, void __iomem *addr, u32 value);
-extern void pci_mmconfig_register_mmio(struct pci_mmcfg_mmio_ops *ops);
-
-extern struct list_head pci_mmcfg_list;
-
-#define PCI_MMCFG_BUS_OFFSET(bus)      ((bus) << 20)

  /*
   * AMD Fam10h CPUs are buggy, and cannot access MMIO config space
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 6ac2738..5dfccef 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -4,6 +4,7 @@
  #include <linux/irq.h>
  #include <linux/dmi.h>
  #include <linux/slab.h>
+#include <linux/ecam.h>
  #include <asm/numa.h>
  #include <asm/pci_x86.h>

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 685cd4c..5064302 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -18,6 +18,7 @@
  #include <linux/slab.h>
  #include <linux/mutex.h>
  #include <linux/rculist.h>
+#include <linux/ecam.h>
  #include <asm/e820.h>
  #include <asm/pci_x86.h>
  #include <asm/acpi.h>
@@ -27,52 +28,6 @@
  /* Indicate if the mmcfg resources have been placed into the resource table. */
  static bool pci_mmcfg_running_state;
  static bool pci_mmcfg_arch_init_failed;
-static DEFINE_MUTEX(pci_mmcfg_lock);
-
-LIST_HEAD(pci_mmcfg_list);
-
-static u32
-pci_mmconfig_generic_read(int len, void __iomem *addr)
-{
-	u32 data = 0;
-
-	switch (len) {
-	case 1:
-		data = readb(addr);
-		break;
-	case 2:
-		data = readw(addr);
-		break;
-	case 4:
-		data = readl(addr);
-		break;
-	}
-
-	return data;
-}
-
-static void
-pci_mmconfig_generic_write(int len, void __iomem *addr, u32 value)
-{
-	switch (len) {
-	case 1:
-		writeb(value, addr);
-		break;
-	case 2:
-		writew(value, addr);
-		break;
-	case 4:
-		writel(value, addr);
-		break;
-	}
-}
-
-static struct pci_mmcfg_mmio_ops pci_mmcfg_mmio_default = {
-	.read = pci_mmconfig_generic_read,
-	.write = pci_mmconfig_generic_write,
-};
-
-static struct pci_mmcfg_mmio_ops *pci_mmcfg_mmio = &pci_mmcfg_mmio_default;

  static u32
  pci_mmconfig_amd_read(int len, void __iomem *addr)
@@ -115,128 +70,6 @@ static struct pci_mmcfg_mmio_ops pci_mmcfg_mmio_amd_fam10h = {
  	.write = pci_mmconfig_amd_write,
  };

-void
-pci_mmconfig_register_mmio(struct pci_mmcfg_mmio_ops *ops)
-{
-	pci_mmcfg_mmio = ops;
-}
-
-u32
-pci_mmio_read(int len, void __iomem *addr)
-{
-	if (!pci_mmcfg_mmio) {
-		pr_err("PCI config space has no accessors !");
-		return 0;
-	}
-
-	return pci_mmcfg_mmio->read(len, addr);
-}
-
-void
-pci_mmio_write(int len, void __iomem *addr, u32 value)
-{
-	if (!pci_mmcfg_mmio) {
-		pr_err("PCI config space has no accessors !");
-		return;
-	}
-
-	pci_mmcfg_mmio->write(len, addr, value);
-}
-
-static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg)
-{
-	if (cfg->res.parent)
-		release_resource(&cfg->res);
-	list_del(&cfg->list);
-	kfree(cfg);
-}
-
-static void __init free_all_mmcfg(void)
-{
-	struct pci_mmcfg_region *cfg, *tmp;
-
-	pci_mmcfg_arch_free();
-	list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list)
-		pci_mmconfig_remove(cfg);
-}
-
-static void list_add_sorted(struct pci_mmcfg_region *new)
-{
-	struct pci_mmcfg_region *cfg;
-
-	/* keep list sorted by segment and starting bus number */
-	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) {
-		if (cfg->segment > new->segment ||
-		    (cfg->segment == new->segment &&
-		     cfg->start_bus >= new->start_bus)) {
-			list_add_tail_rcu(&new->list, &cfg->list);
-			return;
-		}
-	}
-	list_add_tail_rcu(&new->list, &pci_mmcfg_list);
-}
-
-static struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
-						   int end, u64 addr)
-{
-	struct pci_mmcfg_region *new;
-	struct resource *res;
-
-	if (addr == 0)
-		return NULL;
-
-	new = kzalloc(sizeof(*new), GFP_KERNEL);
-	if (!new)
-		return NULL;
-
-	new->address = addr;
-	new->segment = segment;
-	new->start_bus = start;
-	new->end_bus = end;
-
-	res = &new->res;
-	res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
-	res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1;
-	res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
-	snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN,
-		 "PCI MMCONFIG %04x [bus %02x-%02x]", segment, start, end);
-	res->name = new->name;
-
-	return new;
-}
-
-static struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
-							int end, u64 addr)
-{
-	struct pci_mmcfg_region *new;
-
-	new = pci_mmconfig_alloc(segment, start, end, addr);
-	if (new) {
-		mutex_lock(&pci_mmcfg_lock);
-		list_add_sorted(new);
-		mutex_unlock(&pci_mmcfg_lock);
-
-		pr_info(PREFIX
-		       "MMCONFIG for domain %04x [bus %02x-%02x] at %pR "
-		       "(base %#lx)\n",
-		       segment, start, end, &new->res, (unsigned long)addr);
-	}
-
-	return new;
-}
-
-struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus)
-{
-	struct pci_mmcfg_region *cfg;
-
-	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
-		if (cfg->segment == segment &&
-		    cfg->start_bus <= bus && bus <= cfg->end_bus)
-			return cfg;
-
-	return NULL;
-}
-
  static const char *__init pci_mmcfg_e7520(void)
  {
  	u32 win;
@@ -657,73 +490,6 @@ static void __init pci_mmcfg_reject_broken(int early)
  	}
  }

-static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
-					struct acpi_mcfg_allocation *cfg)
-{
-	int year;
-
-	if (cfg->address < 0xFFFFFFFF)
-		return 0;
-
-	if (!strncmp(mcfg->header.oem_id, "SGI", 3))
-		return 0;
-
-	if (mcfg->header.revision >= 1) {
-		if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) &&
-		    year >= 2010)
-			return 0;
-	}
-
-	pr_err(PREFIX "MCFG region for %04x [bus %02x-%02x] at %#llx "
-	       "is above 4GB, ignored\n", cfg->pci_segment,
-	       cfg->start_bus_number, cfg->end_bus_number, cfg->address);
-	return -EINVAL;
-}

This looks very arch-specific. Shouldn't this be only generic checks
with some hook for architectures to add arch-specific checks?

Yes, you are right it should go to arch specific call. Thanks.

Tomasz
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