perf/x86/intel/uncore: Factor out __snr_uncore_mmio_init_box

The IMC uncore unit in Ice Lake server can only be accessed by MMIO,
which is similar as Snow Ridge.
Factor out __snr_uncore_mmio_init_box which can be shared with Ice Lake
server in the following patch.

No functional changes.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1584470314-46657-2-git-send-email-kan.liang@linux.intel.com

arch/x86/events/intel/uncore_snbep.c

@@ -4380,10 +4380,10 @@ static struct pci_dev *snr_uncore_get_mc_dev(int id)
 	return mc_dev;
 }
 
-static void snr_uncore_mmio_init_box(struct intel_uncore_box *box)
+static void __snr_uncore_mmio_init_box(struct intel_uncore_box *box,
+				       unsigned int box_ctl, int mem_offset)
 {
 	struct pci_dev *pdev = snr_uncore_get_mc_dev(box->dieid);
-	unsigned int box_ctl = uncore_mmio_box_ctl(box);
 	resource_size_t addr;
 	u32 pci_dword;
 
@@ -4393,7 +4393,7 @@ static void snr_uncore_mmio_init_box(struct intel_uncore_box *box)
 	pci_read_config_dword(pdev, SNR_IMC_MMIO_BASE_OFFSET, &pci_dword);
 	addr = (pci_dword & SNR_IMC_MMIO_BASE_MASK) << 23;
 
-	pci_read_config_dword(pdev, SNR_IMC_MMIO_MEM0_OFFSET, &pci_dword);
+	pci_read_config_dword(pdev, mem_offset, &pci_dword);
 	addr |= (pci_dword & SNR_IMC_MMIO_MEM0_MASK) << 12;
 
 	addr += box_ctl;
@@ -4405,6 +4405,12 @@ static void snr_uncore_mmio_init_box(struct intel_uncore_box *box)
 	writel(IVBEP_PMON_BOX_CTL_INT, box->io_addr);
 }
 
+static void snr_uncore_mmio_init_box(struct intel_uncore_box *box)
+{
+	__snr_uncore_mmio_init_box(box, uncore_mmio_box_ctl(box),
+				   SNR_IMC_MMIO_MEM0_OFFSET);
+}
+
 static void snr_uncore_mmio_disable_box(struct intel_uncore_box *box)
 {
 	u32 config;