linux-kernel - Re: [2/2] hwmon: xgene: Support PCC shared memory in IO region

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Date:   Sun, 1 Oct 2017 12:46:13 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     hotran <hotran@....com>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Itaru Kitayama <itaru.kitayama@...en.jp>, lho@....com,
        kdinh@....com, patches@....com
Subject: Re: [2/2] hwmon: xgene: Support PCC shared memory in IO region

On Sun, Oct 01, 2017 at 07:31:32AM -0700, Guenter Roeck wrote:
> On Thu, Sep 21, 2017 at 10:17:10AM -0700, hotran wrote:
> > As the PCC shared memory could be in IO region which doesn't
> > support caching, this patch simply uses ioremap() for IO region.
> > 
> > Signed-off-by: Hoan Tran <hotran@....com>
> 
> Applied to hwmon-next.
> 
Turns out this doesn't work. memblock_is_memory() is not exported and marked
__init_memblock, and thus not qavailable for modules. Dropped.

Guenter

> Thanks,
> Guenter
> 
> > ---
> >  drivers/hwmon/xgene-hwmon.c | 14 +++++++++++---
> >  1 file changed, 11 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/hwmon/xgene-hwmon.c b/drivers/hwmon/xgene-hwmon.c
> > index 5cd327e..2dac1ed 100644
> > --- a/drivers/hwmon/xgene-hwmon.c
> > +++ b/drivers/hwmon/xgene-hwmon.c
> > @@ -32,6 +32,7 @@
> >  #include <linux/kfifo.h>
> >  #include <linux/mailbox_controller.h>
> >  #include <linux/mailbox_client.h>
> > +#include <linux/memblock.h>
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> >  #include <linux/platform_device.h>
> > @@ -135,6 +136,14 @@ static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
> >  	return ret;
> >  }
> >  
> > +static void __iomem *pcc_ioremap(phys_addr_t phys, size_t size)
> > +{
> > +	if (!memblock_is_memory(phys))
> > +		return ioremap(phys, size);
> > +
> > +	return memremap(phys, size, MEMREMAP_WB);
> > +}
> > +
> >  static int xgene_hwmon_pcc_rd(struct xgene_hwmon_dev *ctx, u32 *msg)
> >  {
> >  	struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
> > @@ -690,9 +699,8 @@ static int xgene_hwmon_probe(struct platform_device *pdev)
> >  		 */
> >  		ctx->comm_base_addr = cppc_ss->base_address;
> >  		if (ctx->comm_base_addr) {
> > -			ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
> > -							cppc_ss->length,
> > -							MEMREMAP_WB);
> > +			ctx->pcc_comm_addr = pcc_ioremap(ctx->comm_base_addr,
> > +							 cppc_ss->length);
> >  		} else {
> >  			dev_err(&pdev->dev, "Failed to get PCC comm region\n");
> >  			rc = -ENODEV;