Hi Luis,
Sorry for delay in response. Actually I was looking for the history of
this section of code but I couldn't find it. Anyway this is dead code
and we are fine with removing this dead code.
James,
Please consider this patch as Acked-by: "Sreekanth Reddy"
<sreekanth.re...@avagotech.com>
Regards,
Sreekanth
On Wed, Apr 22, 2015 at 2:16 AM, Luis R. Rodriguez
<mcg...@do-not-panic.com> wrote:
> From: "Luis R. Rodriguez" <mcg...@suse.com>
>
> If and when this gets enabled the driver could should split
> up IO memory space properly and that is quite a bit of work.
> Just remove the uncommented dead MTRR code then.
>
> There are a few motivations for this:
>
> a) Take advantage of PAT when available
>
> b) Help bury MTRR code away, MTRR is architecture specific and on
> x86 its replaced by PAT
>
> c) Help with the goal of eventually using _PAGE_CACHE_UC over
> _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (see commit
> de33c442e titled "x86 PAT: fix performance drop for glx,
> use UC minus for ioremap(), ioremap_nocache() and
> pci_mmap_page_range()")
>
> Cc: Toshi Kani <toshi.k...@hp.com>
> Cc: Christoph Hellwig <h...@infradead.org>
> Cc: Nagalakshmi Nandigama <nagalakshmi.nandig...@avagotech.com>
> Cc: Praveen Krishnamoorthy <praveen.krishnamoor...@avagotech.com>
> Cc: Sreekanth Reddy <sreekanth.re...@avagotech.com>
> Cc: Abhijit Mahajan <abhijit.maha...@avagotech.com>
> Cc: linux-scsi@vger.kernel.org
> Cc: Andy Lutomirski <l...@amacapital.net>
> Cc: Suresh Siddha <sbsid...@gmail.com>
> Cc: Ingo Molnar <mi...@elte.hu>
> Cc: Thomas Gleixner <t...@linutronix.de>
> Cc: Juergen Gross <jgr...@suse.com>
> Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
> Cc: Juergen Gross <jgr...@suse.com>
> Cc: Dave Airlie <airl...@redhat.com>
> Cc: Antonino Daplas <adap...@gmail.com>
> Cc: Tomi Valkeinen <tomi.valkei...@ti.com>
> Cc: Ville Syrjälä <syrj...@sci.fi>
> Cc: Mel Gorman <mgor...@suse.de>
> Cc: Vlastimil Babka <vba...@suse.cz>
> Cc: Borislav Petkov <b...@suse.de>
> Cc: Davidlohr Bueso <dbu...@suse.de>
> Cc: Jean-Christophe Plagniol-Villard <plagn...@jcrosoft.com>
> Cc: mpt-fusionlinux....@avagotech.com
> Cc: linux-scsi@vger.kernel.org
> Cc: linux-ker...@vger.kernel.org
> Signed-off-by: Luis R. Rodriguez <mcg...@suse.com>
> ---
> drivers/message/fusion/mptbase.c | 24 ------------------------
> drivers/message/fusion/mptbase.h | 1 -
> 2 files changed, 25 deletions(-)
>
> diff --git a/drivers/message/fusion/mptbase.c
> b/drivers/message/fusion/mptbase.c
> index 187f836..5dcc031 100644
> --- a/drivers/message/fusion/mptbase.c
> +++ b/drivers/message/fusion/mptbase.c
> @@ -59,10 +59,6 @@
> #include <linux/delay.h>
> #include <linux/interrupt.h> /* needed for in_interrupt() proto */
> #include <linux/dma-mapping.h>
> -#include <asm/io.h>
> -#ifdef CONFIG_MTRR
> -#include <asm/mtrr.h>
> -#endif
> #include <linux/kthread.h>
> #include <scsi/scsi_host.h>
>
> @@ -2820,13 +2816,6 @@ mpt_adapter_dispose(MPT_ADAPTER *ioc)
> pci_disable_device(ioc->pcidev);
> pci_release_selected_regions(ioc->pcidev, ioc->bars);
>
> -#if defined(CONFIG_MTRR) && 0
> - if (ioc->mtrr_reg > 0) {
> - mtrr_del(ioc->mtrr_reg, 0, 0);
> - dprintk(ioc, printk(MYIOC_s_INFO_FMT "MTRR region
> de-registered\n", ioc->name));
> - }
> -#endif
> -
> /* Zap the adapter lookup ptr! */
> list_del(&ioc->list);
>
> @@ -4512,19 +4501,6 @@ PrimeIocFifos(MPT_ADAPTER *ioc)
>
> ioc->req_frames_low_dma = (u32) (alloc_dma & 0xFFFFFFFF);
>
> -#if defined(CONFIG_MTRR) && 0
> - /*
> - * Enable Write Combining MTRR for IOC's memory region.
> - * (at least as much as we can; "size and base must be
> - * multiples of 4 kiB"
> - */
> - ioc->mtrr_reg = mtrr_add(ioc->req_frames_dma,
> - sz,
> - MTRR_TYPE_WRCOMB, 1);
> - dprintk(ioc, printk(MYIOC_s_DEBUG_FMT "MTRR region registered
> (base:size=%08x:%x)\n",
> - ioc->name, ioc->req_frames_dma, sz));
> -#endif
> -
> for (i = 0; i < ioc->req_depth; i++) {
> alloc_dma += ioc->req_sz;
> mem += ioc->req_sz;
> diff --git a/drivers/message/fusion/mptbase.h
> b/drivers/message/fusion/mptbase.h
> index 8f14090..813d463 100644
> --- a/drivers/message/fusion/mptbase.h
> +++ b/drivers/message/fusion/mptbase.h
> @@ -671,7 +671,6 @@ typedef struct _MPT_ADAPTER
> u8 *HostPageBuffer; /* SAS - host page buffer
> support */
> u32 HostPageBuffer_sz;
> dma_addr_t HostPageBuffer_dma;
> - int mtrr_reg;
> struct pci_dev *pcidev; /* struct pci_dev pointer */
> int bars; /* bitmask of BAR's that must
> be configured */
> int msi_enable;
> --
> 2.3.2.209.gd67f9d5.dirty
>
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