Commit 77e2a047 authored by Sudeep Holla's avatar Sudeep Holla Committed by Rafael J. Wysocki

ACPI: PCC: Implement OperationRegion handler for the PCC Type 3 subtype

PCC OpRegion provides a mechanism to communicate with the platform
directly from the AML. PCCT provides the list of PCC channel available
in the platform, a subset or all of them can be used in PCC Opregion.

This patch registers the PCC OpRegion handler before ACPI tables are
loaded. This relies on the special context data passed to identify and
set up the PCC channel before the OpRegion handler is executed for the
first time.

Typical PCC Opregion declaration looks like this:

OperationRegion (PFRM, PCC, 2, 0x74)
Field (PFRM, ByteAcc, NoLock, Preserve)
{
    SIGN,   32,
    FLGS,   32,
    LEN,    32,
    CMD,    32,
    DATA,   800
}

It contains four named double words followed by 100 bytes of buffer
names DATA.

ASL can fill out the buffer something like:

    /* Create global or local buffer */
    Name (BUFF, Buffer (0x0C){})
    /* Create double word fields over the buffer */
    CreateDWordField (BUFF, 0x0, WD0)
    CreateDWordField (BUFF, 0x04, WD1)
    CreateDWordField (BUFF, 0x08, WD2)

    /* Fill the named fields */
    WD0 = 0x50434300
    SIGN = BUFF
    WD0 = 1
    FLGS = BUFF
    WD0 = 0x10
    LEN = BUFF

    /* Fill the payload in the DATA buffer */
    WD0 = 0
    WD1 = 0x08
    WD2 = 0
    DATA = BUFF

    /* Write to CMD field to trigger handler */
    WD0 = 0x4404
    CMD = BUFF

This buffer is received by acpi_pcc_opregion_space_handler. This
handler will fetch the complete buffer via internal_pcc_buffer.

The setup handler will receive the special PCC context data which will
contain the PCC channel index which used to set up the channel. The
buffer pointer and length is saved in region context which is then used
in the handler.

(kernel test robot: Build failure with CONFIG_ACPI_DEBUGGER)
Link: https://lore.kernel.org/r/202201041539.feAV0l27-lkp@intel.comReported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent c95545a0
......@@ -524,6 +524,23 @@ config ACPI_PPTT
bool
endif
config ACPI_PCC
bool "ACPI PCC Address Space"
depends on PCC
default y
help
The PCC Address Space also referred as PCC Operation Region pertains
to the region of PCC subspace that succeeds the PCC signature.
The PCC Operation Region works in conjunction with the PCC Table
(Platform Communications Channel Table). PCC subspaces that are
marked for use as PCC Operation Regions must not be used as PCC
subspaces for the standard ACPI features such as CPPC, RASF, PDTT and
MPST. These standard features must always use the PCC Table instead.
Enable this feature if you want to set up and install the PCC Address
Space handler to handle PCC OpRegion in the firmware.
source "drivers/acpi/pmic/Kconfig"
config ACPI_VIOT
......
......@@ -67,6 +67,7 @@ acpi-$(CONFIG_ACPI_LPIT) += acpi_lpit.o
acpi-$(CONFIG_ACPI_GENERIC_GSI) += irq.o
acpi-$(CONFIG_ACPI_WATCHDOG) += acpi_watchdog.o
acpi-$(CONFIG_ACPI_PRMT) += prmt.o
acpi-$(CONFIG_ACPI_PCC) += acpi_pcc.o
# Address translation
acpi-$(CONFIG_ACPI_ADXL) += acpi_adxl.o
......
// SPDX-License-Identifier: GPL-2.0-only
/*
* Author: Sudeep Holla <sudeep.holla@arm.com>
* Copyright 2021 Arm Limited
*
* The PCC Address Space also referred as PCC Operation Region pertains to the
* region of PCC subspace that succeeds the PCC signature. The PCC Operation
* Region works in conjunction with the PCC Table(Platform Communications
* Channel Table). PCC subspaces that are marked for use as PCC Operation
* Regions must not be used as PCC subspaces for the standard ACPI features
* such as CPPC, RASF, PDTT and MPST. These standard features must always use
* the PCC Table instead.
*
* This driver sets up the PCC Address Space and installs an handler to enable
* handling of PCC OpRegion in the firmware.
*
*/
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/completion.h>
#include <linux/idr.h>
#include <linux/io.h>
#include <acpi/pcc.h>
struct pcc_data {
struct pcc_mbox_chan *pcc_chan;
void __iomem *pcc_comm_addr;
struct completion done;
struct mbox_client cl;
struct acpi_pcc_info ctx;
};
struct acpi_pcc_info pcc_ctx;
static void pcc_rx_callback(struct mbox_client *cl, void *m)
{
struct pcc_data *data = container_of(cl, struct pcc_data, cl);
complete(&data->done);
}
static acpi_status
acpi_pcc_address_space_setup(acpi_handle region_handle, u32 function,
void *handler_context, void **region_context)
{
struct pcc_data *data;
struct acpi_pcc_info *ctx = handler_context;
struct pcc_mbox_chan *pcc_chan;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return AE_NO_MEMORY;
data->cl.rx_callback = pcc_rx_callback;
data->cl.knows_txdone = true;
data->ctx.length = ctx->length;
data->ctx.subspace_id = ctx->subspace_id;
data->ctx.internal_buffer = ctx->internal_buffer;
init_completion(&data->done);
data->pcc_chan = pcc_mbox_request_channel(&data->cl, ctx->subspace_id);
if (IS_ERR(data->pcc_chan)) {
pr_err("Failed to find PCC channel for subspace %d\n",
ctx->subspace_id);
return AE_NOT_FOUND;
}
pcc_chan = data->pcc_chan;
data->pcc_comm_addr = acpi_os_ioremap(pcc_chan->shmem_base_addr,
pcc_chan->shmem_size);
if (!data->pcc_comm_addr) {
pr_err("Failed to ioremap PCC comm region mem for %d\n",
ctx->subspace_id);
return AE_NO_MEMORY;
}
*region_context = data;
return AE_OK;
}
static acpi_status
acpi_pcc_address_space_handler(u32 function, acpi_physical_address addr,
u32 bits, acpi_integer *value,
void *handler_context, void *region_context)
{
int ret;
struct pcc_data *data = region_context;
reinit_completion(&data->done);
/* Write to Shared Memory */
memcpy_toio(data->pcc_comm_addr, (void *)value, data->ctx.length);
ret = mbox_send_message(data->pcc_chan->mchan, NULL);
if (ret < 0)
return AE_ERROR;
if (data->pcc_chan->mchan->mbox->txdone_irq)
wait_for_completion(&data->done);
mbox_client_txdone(data->pcc_chan->mchan, ret);
memcpy_fromio(value, data->pcc_comm_addr, data->ctx.length);
return AE_OK;
}
void __init acpi_init_pcc(void)
{
acpi_status status;
status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
ACPI_ADR_SPACE_PLATFORM_COMM,
&acpi_pcc_address_space_handler,
&acpi_pcc_address_space_setup,
&pcc_ctx);
if (ACPI_FAILURE(status))
pr_alert("OperationRegion handler could not be installed\n");
}
......@@ -1320,6 +1320,7 @@ static int __init acpi_init(void)
pr_debug("%s: kset create error\n", __func__);
init_prmt();
acpi_init_pcc();
result = acpi_bus_init();
if (result) {
kobject_put(acpi_kobj);
......
......@@ -1389,6 +1389,12 @@ static inline int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
}
#endif
#ifdef CONFIG_ACPI_PCC
void acpi_init_pcc(void);
#else
static inline void acpi_init_pcc(void) { }
#endif
#ifdef CONFIG_ACPI
extern void acpi_device_notify(struct device *dev);
extern void acpi_device_notify_remove(struct device *dev);
......
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