litmus-rt.git - The LITMUS^RT kernel.

The LITMUS^RT kernel.

Bjoern Brandenburg

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author	Trond Myklebust <Trond.Myklebust@netapp.com>	2006-06-29 16:38:36 -0400
committer	Trond Myklebust <Trond.Myklebust@netapp.com>	2006-07-05 13:13:18 -0400
commit	42a2d13eee3c895d22e9d1a52b96d15ca49adabc (patch)
tree	42e2195fa5ee1ed867418aedf42ee17624553c5f /kernel/sysctl.c
parent	9b07357490e5c7a1c3c2b6f4679d7ee4b4185ecd (diff)

NFSv4: Ensure nfs4_lock_expired() caches delegated locks

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Diffstat (limited to 'kernel/sysctl.c')

0 files changed, 0 insertions, 0 deletions

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (C) 2013 Freescale Semiconductor, Inc.
 *
 */

#define pr_fmt(fmt)    "fsl-pamu: %s: " fmt, __func__

#include "fsl_pamu.h"

#include <linux/fsl/guts.h>
#include <linux/interrupt.h>
#include <linux/genalloc.h>

#include <asm/mpc85xx.h>

/* define indexes for each operation mapping scenario */
#define OMI_QMAN        0x00
#define OMI_FMAN        0x01
#define OMI_QMAN_PRIV   0x02
#define OMI_CAAM        0x03

#define make64(high, low) (((u64)(high) << 32) | (low))

struct pamu_isr_data {
	void __iomem *pamu_reg_base;	/* Base address of PAMU regs */
	unsigned int count;		/* The number of PAMUs */
};

static struct paace *ppaact;
static struct paace *spaact;

/*
 * Table for matching compatible strings, for device tree
 * guts node, for QorIQ SOCs.
 * "fsl,qoriq-device-config-2.0" corresponds to T4 & B4
 * SOCs. For the older SOCs "fsl,qoriq-device-config-1.0"
 * string would be used.
 */
static const struct of_device_id guts_device_ids[] = {
	{ .compatible = "fsl,qoriq-device-config-1.0", },
	{ .compatible = "fsl,qoriq-device-config-2.0", },
	{}
};

/*
 * Table for matching compatible strings, for device tree
 * L3 cache controller node.
 * "fsl,t4240-l3-cache-controller" corresponds to T4,
 * "fsl,b4860-l3-cache-controller" corresponds to B4 &
 * "fsl,p4080-l3-cache-controller" corresponds to other,
 * SOCs.
 */
static const struct of_device_id l3_device_ids[] = {
	{ .compatible = "fsl,t4240-l3-cache-controller", },
	{ .compatible = "fsl,b4860-l3-cache-controller", },
	{ .compatible = "fsl,p4080-l3-cache-controller", },
	{}
};

/* maximum subwindows permitted per liodn */
static u32 max_subwindow_count;

/* Pool for fspi allocation */
static struct gen_pool *spaace_pool;

/**
 * pamu_get_max_subwin_cnt() - Return the maximum supported
 * subwindow count per liodn.
 *
 */
u32 pamu_get_max_subwin_cnt(void)
{
	return max_subwindow_count;
}

/**
 * pamu_get_ppaace() - Return the primary PACCE
 * @liodn: liodn PAACT index for desired PAACE
 *
 * Returns the ppace pointer upon success else return
 * null.
 */
static struct paace *pamu_get_ppaace(int liodn)
{
	if (!ppaact || liodn >= PAACE_NUMBER_ENTRIES) {
		pr_debug("PPAACT doesn't exist\n");
		return NULL;
	}

	return &ppaact[liodn];
}

/**
 * pamu_enable_liodn() - Set valid bit of PACCE
 * @liodn: liodn PAACT index for desired PAACE
 *
 * Returns 0 upon success else error code < 0 returned
 */
int pamu_enable_liodn(int liodn)
{
	struct paace *ppaace;

	ppaace = pamu_get_ppaace(liodn);
	if (!ppaace) {
		pr_debug("Invalid primary paace entry\n");
		return -ENOENT;
	}

	if (!get_bf(ppaace->addr_bitfields, PPAACE_AF_WSE)) {
		pr_debug("liodn %d not configured\n", liodn);
		return -EINVAL;
	}

	/* Ensure that all other stores to the ppaace complete first */
	mb();

	set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_VALID);
	mb();

	return 0;
}

/**
 * pamu_disable_liodn() - Clears valid bit of PACCE
 * @liodn: liodn PAACT index for desired PAACE
 *
 * Returns 0 upon success else error code < 0 returned
 */
int pamu_disable_liodn(int liodn)
{
	struct paace *ppaace;

	ppaace = pamu_get_ppaace(liodn);
	if (!ppaace) {
		pr_debug("Invalid primary paace entry\n");
		return -ENOENT;
	}

	set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_INVALID);
	mb();

	return 0;
}

/* Derive the window size encoding for a particular PAACE entry */
static unsigned int map_addrspace_size_to_wse(phys_addr_t addrspace_size)
{
	/* Bug if not a power of 2 */
	BUG_ON(addrspace_size & (addrspace_size - 1));

	/* window size is 2^(WSE+1) bytes */
	return fls64(addrspace_size) - 2;
}

/* Derive the PAACE window count encoding for the subwindow count */
static unsigned int map_subwindow_cnt_to_wce(u32 subwindow_cnt)
{
	/* window count is 2^(WCE+1) bytes */
	return __ffs(subwindow_cnt) - 1;
}

/*
 * Set the PAACE type as primary and set the coherency required domain
 * attribute
 */
static void pamu_init_ppaace(struct paace *ppaace)
{
	set_bf(ppaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_PRIMARY);

	set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
	       PAACE_M_COHERENCE_REQ);
}

/*
 * Set the PAACE type as secondary and set the coherency required domain
 * attribute.
 */
static void pamu_init_spaace(struct paace *spaace)
{
	set_bf(spaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_SECONDARY);
	set_bf(spaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
	       PAACE_M_COHERENCE_REQ);
}

/*
 * Return the spaace (corresponding to the secondary window index)
 * for a particular ppaace.
 */
static struct paace *pamu_get_spaace(struct paace *paace, u32 wnum)
{
	u32 subwin_cnt;
	struct paace *spaace = NULL;

	subwin_cnt = 1UL << (get_bf(paace->impl_attr, PAACE_IA_WCE) + 1);

	if (wnum < subwin_cnt)
		spaace = &spaact[paace->fspi + wnum];
	else
		pr_debug("secondary paace out of bounds\n");

	return spaace;
}

/**
 * pamu_get_fspi_and_allocate() - Allocates fspi index and reserves subwindows
 *                                required for primary PAACE in the secondary
 *                                PAACE table.
 * @subwin_cnt: Number of subwindows to be reserved.
 *
 * A PPAACE entry may have a number of associated subwindows. A subwindow
 * corresponds to a SPAACE entry in the SPAACT table. Each PAACE entry stores
 * the index (fspi) of the first SPAACE entry in the SPAACT table. This
 * function returns the index of the first SPAACE entry. The remaining
 * SPAACE entries are reserved contiguously from that index.
 *
 * Returns a valid fspi index in the range of 0 - SPAACE_NUMBER_ENTRIES on success.
 * If no SPAACE entry is available or the allocator can not reserve the required
 * number of contiguous entries function returns ULONG_MAX indicating a failure.
 *
 */
static unsigned long pamu_get_fspi_and_allocate(u32 subwin_cnt)
{
	unsigned long spaace_addr;

	spaace_addr = gen_pool_alloc(spaace_pool, subwin_cnt * sizeof(struct paace));
	if (!spaace_addr)
		return ULONG_MAX;

	return (spaace_addr - (unsigned long)spaact) / (sizeof(struct paace));
}

/* Release the subwindows reserved for a particular LIODN */
void pamu_free_subwins(int liodn)
{
	struct paace *ppaace;
	u32 subwin_cnt, size;

	ppaace = pamu_get_ppaace(liodn);
	if (!ppaace) {
		pr_debug("Invalid liodn entry\n");
		return;
	}

	if (get_bf(ppaace->addr_bitfields, PPAACE_AF_MW)) {
		subwin_cnt = 1UL << (get_bf(ppaace->impl_attr, PAACE_IA_WCE) + 1);
		size = (subwin_cnt - 1) * sizeof(struct paace);
		gen_pool_free(spaace_pool, (unsigned long)&spaact[ppaace->fspi], size);
		set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
	}
}

/*
 * Function used for updating stash destination for the coressponding
 * LIODN.
 */
int  pamu_update_paace_stash(int liodn, u32 subwin, u32 value)
{
	struct paace *paace;

	paace = pamu_get_ppaace(liodn);
	if (!paace) {
		pr_debug("Invalid liodn entry\n");
		return -ENOENT;
	}
	if (subwin) {
		paace = pamu_get_spaace(paace, subwin - 1);
		if (!paace)
			return -ENOENT;
	}
	set_bf(paace->impl_attr, PAACE_IA_CID, value);

	mb();

	return 0;
}

/* Disable a subwindow corresponding to the LIODN */
int pamu_disable_spaace(int liodn, u32 subwin)
{
	struct paace *paace;

	paace = pamu_get_ppaace(liodn);
	if (!paace) {
		pr_debug("Invalid liodn entry\n");
		return -ENOENT;
	}
	if (subwin) {
		paace = pamu_get_spaace(paace, subwin - 1);
		if (!paace)
			return -ENOENT;
		set_bf(paace->addr_bitfields, PAACE_AF_V, PAACE_V_INVALID);
	} else {
		set_bf(paace->addr_bitfields, PAACE_AF_AP,
		       PAACE_AP_PERMS_DENIED);
	}

	mb();

	return 0;
}

/**
 * pamu_config_paace() - Sets up PPAACE entry for specified liodn
 *
 * @liodn: Logical IO device number
 * @win_addr: starting address of DSA window
 * @win-size: size of DSA window
 * @omi: Operation mapping index -- if ~omi == 0 then omi not defined
 * @rpn: real (true physical) page number
 * @stashid: cache stash id for associated cpu -- if ~stashid == 0 then
 *	     stashid not defined
 * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
 *	     snoopid not defined
 * @subwin_cnt: number of sub-windows
 * @prot: window permissions
 *
 * Returns 0 upon success else error code < 0 returned
 */
int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
		       u32 omi, unsigned long rpn, u32 snoopid, u32 stashid,
		       u32 subwin_cnt, int prot)
{
	struct paace *ppaace;
	unsigned long fspi;

	if ((win_size & (win_size - 1)) || win_size < PAMU_PAGE_SIZE) {
		pr_debug("window size too small or not a power of two %pa\n",
			 &win_size);
		return -EINVAL;
	}

	if (win_addr & (win_size - 1)) {
		pr_debug("window address is not aligned with window size\n");
		return -EINVAL;
	}

	ppaace = pamu_get_ppaace(liodn);
	if (!ppaace)
		return -ENOENT;

	/* window size is 2^(WSE+1) bytes */
	set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE,
	       map_addrspace_size_to_wse(win_size));

	pamu_init_ppaace(ppaace);

	ppaace->wbah = win_addr >> (PAMU_PAGE_SHIFT + 20);
	set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL,
	       (win_addr >> PAMU_PAGE_SHIFT));

	/* set up operation mapping if it's configured */
	if (omi < OME_NUMBER_ENTRIES) {
		set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
		ppaace->op_encode.index_ot.omi = omi;
	} else if (~omi != 0) {
		pr_debug("bad operation mapping index: %d\n", omi);
		return -EINVAL;
	}

	/* configure stash id */
	if (~stashid != 0)
		set_bf(ppaace->impl_attr, PAACE_IA_CID, stashid);

	/* configure snoop id */
	if (~snoopid != 0)
		ppaace->domain_attr.to_host.snpid = snoopid;

	if (subwin_cnt) {
		/* The first entry is in the primary PAACE instead */
		fspi = pamu_get_fspi_and_allocate(subwin_cnt - 1);
		if (fspi == ULONG_MAX) {
			pr_debug("spaace indexes exhausted\n");
			return -EINVAL;
		}


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