Commit 5745392e authored by Zhichang Yuan's avatar Zhichang Yuan Committed by Bjorn Helgaas
Browse files

PCI: Apply the new generic I/O management on PCI IO hosts 



After introducing the new generic I/O space management (Logical PIO), the
original PCI MMIO relevant helpers need to be updated based on the new
interfaces defined in logical PIO.

Adapt the corresponding code to match the changes introduced by logical
PIO.

Tested-by: default avatardann frazier <dann.frazier@canonical.com>
Signed-off-by: default avatarZhichang Yuan <yuanzhichang@hisilicon.com>
Signed-off-by: default avatarGabriele Paoloni <gabriele.paoloni@huawei.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>        # earlier draft
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
parent fcfaab30

drivers/pci/pci.c

+17 −75
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/spinlock.h>

#include <linux/string.h>

#include <linux/log2.h>

#include <linux/logic_pio.h>

#include <linux/pci-aspm.h>

#include <linux/pm_wakeup.h>

#include <linux/interrupt.h>
@@ -3440,17 +3441,6 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) 
}

EXPORT_SYMBOL(pci_request_regions_exclusive);



#ifdef PCI_IOBASE

struct io_range {

	struct list_head list;

	phys_addr_t start;

	resource_size_t size;

};



static LIST_HEAD(io_range_list);

static DEFINE_SPINLOCK(io_range_lock);

#endif



/*

 * Record the PCI IO range (expressed as CPU physical address + size).

 * Return a negative value if an error has occured, zero otherwise
@@ -3458,51 +3448,28 @@ static DEFINE_SPINLOCK(io_range_lock); 
int pci_register_io_range(struct fwnode_handle *fwnode, phys_addr_t addr,

			resource_size_t	size)

{

	int err = 0;



	int ret = 0;

#ifdef PCI_IOBASE

	struct io_range *range;

	resource_size_t allocated_size = 0;



	/* check if the range hasn't been previously recorded */

	spin_lock(&io_range_lock);

	list_for_each_entry(range, &io_range_list, list) {

		if (addr >= range->start && addr + size <= range->start + size) {

			/* range already registered, bail out */

			goto end_register;

		}

		allocated_size += range->size;

	}

	struct logic_pio_hwaddr *range;



	/* range not registed yet, check for available space */

	if (allocated_size + size - 1 > IO_SPACE_LIMIT) {

		/* if it's too big check if 64K space can be reserved */

		if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) {

			err = -E2BIG;

			goto end_register;

		}



		size = SZ_64K;

		pr_warn("Requested IO range too big, new size set to 64K\n");

	}

	if (!size || addr + size < addr)

		return -EINVAL;



	/* add the range to the list */

	range = kzalloc(sizeof(*range), GFP_ATOMIC);

	if (!range) {

		err = -ENOMEM;

		goto end_register;

	}

	if (!range)

		return -ENOMEM;



	range->start = addr;

	range->fwnode = fwnode;

	range->size = size;

	range->hw_start = addr;

	range->flags = LOGIC_PIO_CPU_MMIO;



	list_add_tail(&range->list, &io_range_list);



end_register:

	spin_unlock(&io_range_lock);

	ret = logic_pio_register_range(range);

	if (ret)

		kfree(range);

#endif



	return err;

	return ret;

}



phys_addr_t pci_pio_to_address(unsigned long pio)
@@ -3510,21 +3477,10 @@ phys_addr_t pci_pio_to_address(unsigned long pio) 
	phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;



#ifdef PCI_IOBASE

	struct io_range *range;

	resource_size_t allocated_size = 0;



	if (pio > IO_SPACE_LIMIT)

	if (pio >= MMIO_UPPER_LIMIT)

		return address;



	spin_lock(&io_range_lock);

	list_for_each_entry(range, &io_range_list, list) {

		if (pio >= allocated_size && pio < allocated_size + range->size) {

			address = range->start + pio - allocated_size;

			break;

		}

		allocated_size += range->size;

	}

	spin_unlock(&io_range_lock);

	address = logic_pio_to_hwaddr(pio);

#endif



	return address;
@@ -3533,21 +3489,7 @@ phys_addr_t pci_pio_to_address(unsigned long pio) 
unsigned long __weak pci_address_to_pio(phys_addr_t address)

{

#ifdef PCI_IOBASE

	struct io_range *res;

	resource_size_t offset = 0;

	unsigned long addr = -1;



	spin_lock(&io_range_lock);

	list_for_each_entry(res, &io_range_list, list) {

		if (address >= res->start && address < res->start + res->size) {

			addr = address - res->start + offset;

			break;

		}

		offset += res->size;

	}

	spin_unlock(&io_range_lock);



	return addr;

	return logic_pio_trans_cpuaddr(address);

#else

	if (address > IO_SPACE_LIMIT)

		return (unsigned long)-1;

include/asm-generic/io.h

+1 −1
Original line number Diff line number Diff line
@@ -901,7 +901,7 @@ static inline void iounmap(void __iomem *addr) 
#define ioport_map ioport_map

static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)

{

	return PCI_IOBASE + (port & IO_SPACE_LIMIT);

	return PCI_IOBASE + (port & MMIO_UPPER_LIMIT);

}

#endif

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