linux-kernel - Re: [PATCH] perf/x86/intel/uncore: Make uncore

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Date:   Tue, 22 Feb 2022 11:11:13 -0500
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Steve Wahl <steve.wahl@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "Liang, Kan" <kan.liang@...el.com>
Subject: Re: [PATCH] perf/x86/intel/uncore: Make uncore_discovery clean for 64
 bit addresses



On 2/18/2022 12:54 PM, Steve Wahl wrote:
> Support 64-bit BAR size for discovery, and do not truncate return from
> generic_uncore_mmio_box_ctl() to 32 bits.
> 
> Signed-off-by: Steve Wahl <steve.wahl@....com>

Thanks for the patch.

Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>


Thanks,
Kan
> ---
>   arch/x86/events/intel/uncore_discovery.c | 16 +++++++++++-----
>   arch/x86/events/intel/uncore_discovery.h |  2 --
>   2 files changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/events/intel/uncore_discovery.c b/arch/x86/events/intel/uncore_discovery.c
> index 3049c646fa20..141a540e7403 100644
> --- a/arch/x86/events/intel/uncore_discovery.c
> +++ b/arch/x86/events/intel/uncore_discovery.c
> @@ -210,15 +210,21 @@ static int parse_discovery_table(struct pci_dev *dev, int die,
>   	void __iomem *io_addr;
>   	resource_size_t addr;
>   	unsigned long size;
> -	u32 val;
> +	u32 val, val2;
>   	int i;
>   
>   	pci_read_config_dword(dev, bar_offset, &val);
>   
> -	if (val & UNCORE_DISCOVERY_MASK)
> +	if (val & ~PCI_BASE_ADDRESS_MEM_MASK & ~PCI_BASE_ADDRESS_MEM_TYPE_64)
>   		return -EINVAL;
>   
> -	addr = (resource_size_t)(val & ~UNCORE_DISCOVERY_MASK);
> +	addr = (resource_size_t)(val & PCI_BASE_ADDRESS_MEM_MASK);
> +#ifdef CONFIG_PHYS_ADDR_T_64BIT
> +	if ((val & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == PCI_BASE_ADDRESS_MEM_TYPE_64) {
> +		pci_read_config_dword(dev, bar_offset + 4, &val2);
> +		addr |= ((resource_size_t)val2) << 32;
> +	}
> +#endif
>   	size = UNCORE_DISCOVERY_GLOBAL_MAP_SIZE;
>   	io_addr = ioremap(addr, size);
>   	if (!io_addr)
> @@ -444,7 +450,7 @@ static struct intel_uncore_ops generic_uncore_pci_ops = {
>   
>   #define UNCORE_GENERIC_MMIO_SIZE		0x4000
>   
> -static unsigned int generic_uncore_mmio_box_ctl(struct intel_uncore_box *box)
> +static u64 generic_uncore_mmio_box_ctl(struct intel_uncore_box *box)
>   {
>   	struct intel_uncore_type *type = box->pmu->type;
>   
> @@ -456,7 +462,7 @@ static unsigned int generic_uncore_mmio_box_ctl(struct intel_uncore_box *box)
>   
>   void intel_generic_uncore_mmio_init_box(struct intel_uncore_box *box)
>   {
> -	unsigned int box_ctl = generic_uncore_mmio_box_ctl(box);
> +	u64 box_ctl = generic_uncore_mmio_box_ctl(box);
>   	struct intel_uncore_type *type = box->pmu->type;
>   	resource_size_t addr;
>   
> diff --git a/arch/x86/events/intel/uncore_discovery.h b/arch/x86/events/intel/uncore_discovery.h
> index 6d735611c281..22d40e7afbf1 100644
> --- a/arch/x86/events/intel/uncore_discovery.h
> +++ b/arch/x86/events/intel/uncore_discovery.h
> @@ -18,8 +18,6 @@
>   #define UNCORE_DISCOVERY_BIR_BASE		0x10
>   /* Discovery table BAR step */
>   #define UNCORE_DISCOVERY_BIR_STEP		0x4
> -/* Mask of the discovery table offset */
> -#define UNCORE_DISCOVERY_MASK			0xf
>   /* Global discovery table size */
>   #define UNCORE_DISCOVERY_GLOBAL_MAP_SIZE	0x20
>