watchdog: hpwdt: Remove legacy NMI sourcing. (2b3d89b4) · Commits · 戴 / test

drivers/watchdog/hpwdt.c

+9 −492

Original line number	Diff line number	Diff line
		@@ -28,16 +28,7 @@
		#include <linux/types.h>
		#include <linux/uaccess.h>
		#include <linux/watchdog.h>
		#ifdef CONFIG_HPWDT_NMI_DECODING
		#include <linux/dmi.h>
		#include <linux/spinlock.h>
		#include <linux/nmi.h>
		#include <linux/kdebug.h>
		#include <linux/notifier.h>
		#include <asm/set_memory.h>
		#endif /* CONFIG_HPWDT_NMI_DECODING */
		#include <asm/nmi.h>
		#include <asm/frame.h>

		#define HPWDT_VERSION "1.4.0"
		#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
		@@ -48,6 +39,9 @@
		static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
		static unsigned int reload; /* the computed soft_margin */
		static bool nowayout = WATCHDOG_NOWAYOUT;
		#ifdef CONFIG_HPWDT_NMI_DECODING
		static unsigned int allow_kdump = 1;
		#endif
		static char expect_release;
		static unsigned long hpwdt_is_open;

		@@ -63,373 +57,6 @@ static const struct pci_device_id hpwdt_devices[] = {
		};
		MODULE_DEVICE_TABLE(pci, hpwdt_devices);

		#ifdef CONFIG_HPWDT_NMI_DECODING
		#define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */
		#define CRU_BIOS_SIGNATURE_VALUE 0x55524324
		#define PCI_BIOS32_PARAGRAPH_LEN 16
		#define PCI_ROM_BASE1 0x000F0000
		#define ROM_SIZE 0x10000

		struct bios32_service_dir {
		u32 signature;
		u32 entry_point;
		u8 revision;
		u8 length;
		u8 checksum;
		u8 reserved[5];
		};

		/* type 212 */
		struct smbios_cru64_info {
		u8 type;
		u8 byte_length;
		u16 handle;
		u32 signature;
		u64 physical_address;
		u32 double_length;
		u32 double_offset;
		};
		#define SMBIOS_CRU64_INFORMATION 212

		/* type 219 */
		struct smbios_proliant_info {
		u8 type;
		u8 byte_length;
		u16 handle;
		u32 power_features;
		u32 omega_features;
		u32 reserved;
		u32 misc_features;
		};
		#define SMBIOS_ICRU_INFORMATION 219


		struct cmn_registers {
		union {
		struct {
		u8 ral;
		u8 rah;
		u16 rea2;
		};
		u32 reax;
		} u1;
		union {
		struct {
		u8 rbl;
		u8 rbh;
		u8 reb2l;
		u8 reb2h;
		};
		u32 rebx;
		} u2;
		union {
		struct {
		u8 rcl;
		u8 rch;
		u16 rec2;
		};
		u32 recx;
		} u3;
		union {
		struct {
		u8 rdl;
		u8 rdh;
		u16 red2;
		};
		u32 redx;
		} u4;

		u32 resi;
		u32 redi;
		u16 rds;
		u16 res;
		u32 reflags;
		} __attribute__((packed));

		static unsigned int hpwdt_nmi_decoding;
		static unsigned int allow_kdump = 1;
		static unsigned int is_icru;
		static unsigned int is_uefi;
		static DEFINE_SPINLOCK(rom_lock);
		static void *cru_rom_addr;
		static struct cmn_registers cmn_regs;

		extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
		unsigned long *pRomEntry);

		#ifdef CONFIG_X86_32
		/* --32 Bit Bios------------------------------------------------------------ */

		#define HPWDT_ARCH 32

		asm(".text \n\t"
		".align 4 \n\t"
		".globl asminline_call \n"
		"asminline_call: \n\t"
		"pushl %ebp \n\t"
		"movl %esp, %ebp \n\t"
		"pusha \n\t"
		"pushf \n\t"
		"push %es \n\t"
		"push %ds \n\t"
		"pop %es \n\t"
		"movl 8(%ebp),%eax \n\t"
		"movl 4(%eax),%ebx \n\t"
		"movl 8(%eax),%ecx \n\t"
		"movl 12(%eax),%edx \n\t"
		"movl 16(%eax),%esi \n\t"
		"movl 20(%eax),%edi \n\t"
		"movl (%eax),%eax \n\t"
		"push %cs \n\t"
		"call *12(%ebp) \n\t"
		"pushf \n\t"
		"pushl %eax \n\t"
		"movl 8(%ebp),%eax \n\t"
		"movl %ebx,4(%eax) \n\t"
		"movl %ecx,8(%eax) \n\t"
		"movl %edx,12(%eax) \n\t"
		"movl %esi,16(%eax) \n\t"
		"movl %edi,20(%eax) \n\t"
		"movw %ds,24(%eax) \n\t"
		"movw %es,26(%eax) \n\t"
		"popl %ebx \n\t"
		"movl %ebx,(%eax) \n\t"
		"popl %ebx \n\t"
		"movl %ebx,28(%eax) \n\t"
		"pop %es \n\t"
		"popf \n\t"
		"popa \n\t"
		"leave \n\t"
		"ret \n\t"
		".previous");


		/*
		* cru_detect
		*
		* Routine Description:
		* This function uses the 32-bit BIOS Service Directory record to
		* search for a $CRU record.
		*
		* Return Value:
		* 0 : SUCCESS
		* <0 : FAILURE
		*/
		static int cru_detect(unsigned long map_entry,
		unsigned long map_offset)
		{
		void *bios32_map;
		unsigned long *bios32_entrypoint;
		unsigned long cru_physical_address;
		unsigned long cru_length;
		unsigned long physical_bios_base = 0;
		unsigned long physical_bios_offset = 0;
		int retval = -ENODEV;

		bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));

		if (bios32_map == NULL)
		return -ENODEV;

		bios32_entrypoint = bios32_map + map_offset;

		cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;

		set_memory_x((unsigned long)bios32_map, 2);
		asminline_call(&cmn_regs, bios32_entrypoint);

		if (cmn_regs.u1.ral != 0) {
		pr_warn("Call succeeded but with an error: 0x%x\n",
		cmn_regs.u1.ral);
		} else {
		physical_bios_base = cmn_regs.u2.rebx;
		physical_bios_offset = cmn_regs.u4.redx;
		cru_length = cmn_regs.u3.recx;
		cru_physical_address =
		physical_bios_base + physical_bios_offset;

		/* If the values look OK, then map it in. */
		if ((physical_bios_base + physical_bios_offset)) {
		cru_rom_addr =
		ioremap(cru_physical_address, cru_length);
		if (cru_rom_addr) {
		set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
		(cru_length + PAGE_SIZE - 1) >> PAGE_SHIFT);
		retval = 0;
		}
		}

		pr_debug("CRU Base Address: 0x%lx\n", physical_bios_base);
		pr_debug("CRU Offset Address: 0x%lx\n", physical_bios_offset);
		pr_debug("CRU Length: 0x%lx\n", cru_length);
		pr_debug("CRU Mapped Address: %p\n", &cru_rom_addr);
		}
		iounmap(bios32_map);
		return retval;
		}

		/*
		* bios_checksum
		*/
		static int bios_checksum(const char __iomem *ptr, int len)
		{
		char sum = 0;
		int i;

		/*
		* calculate checksum of size bytes. This should add up
		* to zero if we have a valid header.
		*/
		for (i = 0; i < len; i++)
		sum += ptr[i];

		return ((sum == 0) && (len > 0));
		}

		/*
		* bios32_present
		*
		* Routine Description:
		* This function finds the 32-bit BIOS Service Directory
		*
		* Return Value:
		* 0 : SUCCESS
		* <0 : FAILURE
		*/
		static int bios32_present(const char __iomem *p)
		{
		struct bios32_service_dir *bios_32_ptr;
		int length;
		unsigned long map_entry, map_offset;

		bios_32_ptr = (struct bios32_service_dir *) p;

		/*
		* Search for signature by checking equal to the swizzled value
		* instead of calling another routine to perform a strcmp.
		*/
		if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
		length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
		if (bios_checksum(p, length)) {
		/*
		* According to the spec, we're looking for the
		* first 4KB-aligned address below the entrypoint
		* listed in the header. The Service Directory code
		* is guaranteed to occupy no more than 2 4KB pages.
		*/
		map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
		map_offset = bios_32_ptr->entry_point - map_entry;

		return cru_detect(map_entry, map_offset);
		}
		}
		return -ENODEV;
		}

		static int detect_cru_service(void)
		{
		char __iomem p, q;
		int rc = -1;

		/*
		* Search from 0x0f0000 through 0x0fffff, inclusive.
		*/
		p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
		if (p == NULL)
		return -ENOMEM;

		for (q = p; q < p + ROM_SIZE; q += 16) {
		rc = bios32_present(q);
		if (!rc)
		break;
		}
		iounmap(p);
		return rc;
		}
		/* ------------------------------------------------------------------------- */
		#endif /* CONFIG_X86_32 */
		#ifdef CONFIG_X86_64
		/* --64 Bit Bios------------------------------------------------------------ */

		#define HPWDT_ARCH 64

		asm(".text \n\t"
		".align 4 \n\t"
		".globl asminline_call \n\t"
		".type asminline_call, @function \n\t"
		"asminline_call: \n\t"
		FRAME_BEGIN
		"pushq %rax \n\t"
		"pushq %rbx \n\t"
		"pushq %rdx \n\t"
		"pushq %r12 \n\t"
		"pushq %r9 \n\t"
		"movq %rsi, %r12 \n\t"
		"movq %rdi, %r9 \n\t"
		"movl 4(%r9),%ebx \n\t"
		"movl 8(%r9),%ecx \n\t"
		"movl 12(%r9),%edx \n\t"
		"movl 16(%r9),%esi \n\t"
		"movl 20(%r9),%edi \n\t"
		"movl (%r9),%eax \n\t"
		"call *%r12 \n\t"
		"pushfq \n\t"
		"popq %r12 \n\t"
		"movl %eax, (%r9) \n\t"
		"movl %ebx, 4(%r9) \n\t"
		"movl %ecx, 8(%r9) \n\t"
		"movl %edx, 12(%r9) \n\t"
		"movl %esi, 16(%r9) \n\t"
		"movl %edi, 20(%r9) \n\t"
		"movq %r12, %rax \n\t"
		"movl %eax, 28(%r9) \n\t"
		"popq %r9 \n\t"
		"popq %r12 \n\t"
		"popq %rdx \n\t"
		"popq %rbx \n\t"
		"popq %rax \n\t"
		FRAME_END
		"ret \n\t"
		".previous");

		/*
		* dmi_find_cru
		*
		* Routine Description:
		* This function checks whether or not a SMBIOS/DMI record is
		* the 64bit CRU info or not
		*/
		static void dmi_find_cru(const struct dmi_header dm, void dummy)
		{
		struct smbios_cru64_info *smbios_cru64_ptr;
		unsigned long cru_physical_address;

		if (dm->type == SMBIOS_CRU64_INFORMATION) {
		smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
		if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
		cru_physical_address =
		smbios_cru64_ptr->physical_address +
		smbios_cru64_ptr->double_offset;
		cru_rom_addr = ioremap(cru_physical_address,
		smbios_cru64_ptr->double_length);
		set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
		smbios_cru64_ptr->double_length >> PAGE_SHIFT);
		}
		}
		}

		static int detect_cru_service(void)
		{
		cru_rom_addr = NULL;

		dmi_walk(dmi_find_cru, NULL);

		/* if cru_rom_addr has been set then we found a CRU service */
		return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
		}
		/* ------------------------------------------------------------------------- */
		#endif /* CONFIG_X86_64 */
		#endif /* CONFIG_HPWDT_NMI_DECODING */

		/*
		* Watchdog operations
		@@ -486,30 +113,12 @@ static int hpwdt_my_nmi(void)
		*/
		static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
		{
		unsigned long rom_pl;
		static int die_nmi_called;

		if (!hpwdt_nmi_decoding)
		return NMI_DONE;

		if ((ulReason == NMI_UNKNOWN) && !hpwdt_my_nmi())
		return NMI_DONE;

		spin_lock_irqsave(&rom_lock, rom_pl);
		if (!die_nmi_called && !is_icru && !is_uefi)
		asminline_call(&cmn_regs, cru_rom_addr);
		die_nmi_called = 1;
		spin_unlock_irqrestore(&rom_lock, rom_pl);

		if (allow_kdump)
		hpwdt_stop();

		if (!is_icru && !is_uefi) {
		if (cmn_regs.u1.ral == 0) {
		nmi_panic(regs, "An NMI occurred, but unable to determine source.\n");
		return NMI_HANDLED;
		}
		}
		nmi_panic(regs, "An NMI occurred. Depending on your system the reason "
		"for the NMI is logged in any one of the following "
		"resources:\n"
		@@ -675,84 +284,11 @@ static struct miscdevice hpwdt_miscdev = {
		* Init & Exit
		*/

		#ifdef CONFIG_HPWDT_NMI_DECODING
		#ifdef CONFIG_X86_LOCAL_APIC
		static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
		{
		/*
		* If nmi_watchdog is turned off then we can turn on
		* our nmi decoding capability.
		*/
		hpwdt_nmi_decoding = 1;
		}
		#else
		static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
		{
		dev_warn(&dev->dev, "NMI decoding is disabled. "
		"Your kernel does not support a NMI Watchdog.\n");
		}
		#endif /* CONFIG_X86_LOCAL_APIC */

		/*
		* dmi_find_icru
		*
		* Routine Description:
		* This function checks whether or not we are on an iCRU-based server.
		* This check is independent of architecture and needs to be made for
		* any ProLiant system.
		*/
		static void dmi_find_icru(const struct dmi_header dm, void dummy)
		{
		struct smbios_proliant_info *smbios_proliant_ptr;

		if (dm->type == SMBIOS_ICRU_INFORMATION) {
		smbios_proliant_ptr = (struct smbios_proliant_info *) dm;
		if (smbios_proliant_ptr->misc_features & 0x01)
		is_icru = 1;
		if (smbios_proliant_ptr->misc_features & 0x1400)
		is_uefi = 1;
		}
		}

		static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
		{
		#ifdef CONFIG_HPWDT_NMI_DECODING
		int retval;

		/*
		* On typical CRU-based systems we need to map that service in
		* the BIOS. For 32 bit Operating Systems we need to go through
		* the 32 Bit BIOS Service Directory. For 64 bit Operating
		* Systems we get that service through SMBIOS.
		*
		* On systems that support the new iCRU service all we need to
		* do is call dmi_walk to get the supported flag value and skip
		* the old cru detect code.
		*/
		dmi_walk(dmi_find_icru, NULL);
		if (!is_icru && !is_uefi) {

		/*
		* We need to map the ROM to get the CRU service.
		* For 32 bit Operating Systems we need to go through the 32 Bit
		* BIOS Service Directory
		* For 64 bit Operating Systems we get that service through SMBIOS.
		*/
		retval = detect_cru_service();
		if (retval < 0) {
		dev_warn(&dev->dev,
		"Unable to detect the %d Bit CRU Service.\n",
		HPWDT_ARCH);
		return retval;
		}

		/*
		* We know this is the only CRU call we need to make so lets keep as
		* few instructions as possible once the NMI comes in.
		*/
		cmn_regs.u1.rah = 0x0D;
		cmn_regs.u1.ral = 0x02;
		}

		/*
		* Only one function can register for NMI_UNKNOWN
		*/
		@@ -780,44 +316,25 @@ error:
		dev_warn(&dev->dev,
		"Unable to register a die notifier (err=%d).\n",
		retval);
		if (cru_rom_addr)
		iounmap(cru_rom_addr);
		return retval;
		#endif /* CONFIG_HPWDT_NMI_DECODING */
		return 0;
		}

		static void hpwdt_exit_nmi_decoding(void)
		{
		#ifdef CONFIG_HPWDT_NMI_DECODING
		unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
		unregister_nmi_handler(NMI_SERR, "hpwdt");
		unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
		if (cru_rom_addr)
		iounmap(cru_rom_addr);
		}
		#else /* !CONFIG_HPWDT_NMI_DECODING */
		static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
		{
		}

		static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
		{
		return 0;
		#endif
		}

		static void hpwdt_exit_nmi_decoding(void)
		{
		}
		#endif /* CONFIG_HPWDT_NMI_DECODING */

		static int hpwdt_init_one(struct pci_dev *dev,
		const struct pci_device_id *ent)
		{
		int retval;

		/*
		* Check if we can do NMI decoding or not
		*/
		hpwdt_check_nmi_decoding(dev);

		/*
		* First let's find out if we are on an iLO2+ server. We will
		* not run on a legacy ASM box.
		@@ -922,6 +439,6 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
		#ifdef CONFIG_HPWDT_NMI_DECODING
		module_param(allow_kdump, int, 0);
		MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
		#endif /* !CONFIG_HPWDT_NMI_DECODING */
		#endif /* CONFIG_HPWDT_NMI_DECODING */

		module_pci_driver(hpwdt_driver);

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