Message-ID: <20241017041027.12785-1-vamsikrishna.brahmajosyula@gmail.com>
Date: Thu, 17 Oct 2024 09:40:27 +0530
From: Vamsi Krishna Brahmajosyula <vamsikrishna.brahmajosyula@...il.com>
To: irenic.rajneesh@...il.com,
	david.e.box@...el.com,
	hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	david.e.box@...ux.intel.com
Cc: skhan@...uxfoundation.org,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] platform/x86/intel/pmc: Fix pmc_core_iounmap to call iounmap for valid addresses

50c6dbdfd introduced a WARN when adrress ranges of iounmap are
invalid. On Thinkpad P1 Gen 7 (Meteor Lake-P) this caused the
following warning to appear.

WARNING: CPU: 7 PID: 713 at arch/x86/mm/ioremap.c:461 iounmap+0x58/0x1f0
Modules linked in: rfkill(+) snd_timer(+) fjes(+) snd soundcore intel_pmc_core(+)
int3403_thermal(+) int340x_thermal_zone intel_vsec pmt_telemetry acpi_pad pmt_class
acpi_tad int3400_thermal acpi_thermal_rel joydev loop nfnetlink zram xe drm_suballoc_helper
nouveau i915 mxm_wmi drm_ttm_helper gpu_sched drm_gpuvm drm_exec drm_buddy i2c_algo_bit
crct10dif_pclmul crc32_pclmul ttm crc32c_intel polyval_clmulni rtsx_pci_sdmmc ucsi_acpi
polyval_generic mmc_core hid_multitouch drm_display_helper ghash_clmulni_intel typec_ucsi
nvme sha512_ssse3 video sha256_ssse3 nvme_core intel_vpu sha1_ssse3 rtsx_pci cec typec
nvme_auth i2c_hid_acpi i2c_hid wmi pinctrl_meteorlake serio_raw ip6_tables ip_tables fuse
CPU: 7 UID: 0 PID: 713 Comm: (udev-worker) Not tainted 6.12.0-rc2iounmap+ #42
Hardware name: LENOVO 21KWCTO1WW/21KWCTO1WW, BIOS N48ET19W (1.06 ) 07/18/2024
RIP: 0010:iounmap+0x58/0x1f0
Code: 85 6a 01 00 00 48 8b 05 e6 e2 28 04 48 39 c5 72 19 eb 26 cc cc cc 48 ba 00 00 00 00 00 00 32 00 48 8d 44 02 ff 48 39 c5 72 23 <0f> 0b 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc 48 ba 00 00 00 00 00
RSP: 0018:ffff888131eff038 EFLAGS: 00010207
RAX: ffffc90000000000 RBX: 0000000000000000 RCX: ffff888e33b80000
RDX: dffffc0000000000 RSI: ffff888e33bc29c0 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8881598a8000 R09: ffff888e2ccedc10
R10: 0000000000000003 R11: ffffffffb3367634 R12: 00000000fe000000
R13: ffff888101d0da28 R14: ffffffffc2e437e0 R15: ffff888110b03b28
FS:  00007f3c1d4b3980(0000) GS:ffff888e33b80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005651cfc93578 CR3: 0000000124e4c002 CR4: 0000000000f70ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<TASK>
? __warn.cold+0xb6/0x176
? iounmap+0x58/0x1f0
? report_bug+0x1f4/0x2b0
? handle_bug+0x58/0x90
? exc_invalid_op+0x17/0x40
? asm_exc_invalid_op+0x1a/0x20
? iounmap+0x58/0x1f0
pmc_core_ssram_get_pmc+0x477/0x6c0 [intel_pmc_core]
? __pfx_pmc_core_ssram_get_pmc+0x10/0x10 [intel_pmc_core]
? __pfx_do_pci_enable_device+0x10/0x10
? pci_wait_for_pending+0x60/0x110
? pci_enable_device_flags+0x1e3/0x2e0
? __pfx_mtl_core_init+0x10/0x10 [intel_pmc_core]
pmc_core_ssram_init+0x7f/0x110 [intel_pmc_core]
mtl_core_init+0xda/0x130 [intel_pmc_core]
? __mutex_init+0xb9/0x130
pmc_core_probe+0x27e/0x10b0 [intel_pmc_core]
? _raw_spin_lock_irqsave+0x96/0xf0
? __pfx_pmc_core_probe+0x10/0x10 [intel_pmc_core]
? __pfx_mutex_unlock+0x10/0x10
? __pfx_mutex_lock+0x10/0x10
? device_pm_check_callbacks+0x82/0x370
? acpi_dev_pm_attach+0x234/0x2b0
platform_probe+0x9f/0x150
really_probe+0x1e0/0x8a0
__driver_probe_device+0x18c/0x370
? __pfx___driver_attach+0x10/0x10
driver_probe_device+0x4a/0x120
__driver_attach+0x190/0x4a0
? __pfx___driver_attach+0x10/0x10
bus_for_each_dev+0x103/0x180
? __pfx_bus_for_each_dev+0x10/0x10
? klist_add_tail+0x136/0x270
bus_add_driver+0x2fc/0x540
driver_register+0x1a5/0x360
? __pfx_pmc_core_driver_init+0x10/0x10 [intel_pmc_core]
do_one_initcall+0xa4/0x380
? __pfx_do_one_initcall+0x10/0x10
? kasan_unpoison+0x44/0x70
do_init_module+0x296/0x800
load_module+0x5090/0x6ce0
? __pfx_load_module+0x10/0x10
? ima_post_read_file+0x193/0x200
? __pfx_ima_post_read_file+0x10/0x10
? rw_verify_area+0x152/0x4c0
? kernel_read_file+0x257/0x750
? __pfx_kernel_read_file+0x10/0x10
? __pfx_filemap_get_read_batch+0x10/0x10
? init_module_from_file+0xd1/0x130
init_module_from_file+0xd1/0x130
? __pfx_init_module_from_file+0x10/0x10
? __pfx__raw_spin_lock+0x10/0x10
? __pfx_cred_has_capability.isra.0+0x10/0x10
idempotent_init_module+0x236/0x770
? __pfx_idempotent_init_module+0x10/0x10
? fdget+0x58/0x3f0
? security_capable+0x7d/0x110
__x64_sys_finit_module+0xbe/0x130
do_syscall_64+0x82/0x160
? __pfx_filemap_read+0x10/0x10
? __pfx___fsnotify_parent+0x10/0x10
? vfs_read+0x3a6/0xa30
? vfs_read+0x3a6/0xa30
? __seccomp_filter+0x175/0xc60
? __pfx___seccomp_filter+0x10/0x10
? fdget_pos+0x1ce/0x500
? syscall_exit_to_user_mode_prepare+0x149/0x170
? syscall_exit_to_user_mode+0x10/0x210
? do_syscall_64+0x8e/0x160
? switch_fpu_return+0xe3/0x1f0
? syscall_exit_to_user_mode+0x1d5/0x210
? do_syscall_64+0x8e/0x160
? exc_page_fault+0x76/0xf0
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f3c1d6d155d
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 83 58 0f 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe6309db38 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 0000557c212550a0 RCX: 00007f3c1d6d155d
RDX: 0000000000000000 RSI: 00007f3c1cd943bd RDI: 0000000000000025
RBP: 00007ffe6309dbf0 R08: 00007f3c1d7c7b20 R09: 00007ffe6309db80
R10: 0000557c21255270 R11: 0000000000000246 R12: 00007f3c1cd943bd
R13: 0000000000020000 R14: 0000557c21255c80 R15: 0000557c21255240
</TASK>
---[ end trace 0000000000000000 ]---

pmc_core_iounmap calls iounmap unconditionally causing the above
warning to appear during boot.

Fix it by checking for a valid address before calling iounmap.

Also the function pmc_core_ssram_get_pmc,
	ioremap(ssram_base, SSRAM_HDR_SIZE)
returns NULL on the same meteor lake machine even though the
ssram_base is valid, return -ENOMEM in such cases.

Fixes: a01486dc4bb1 ("platform/x86/intel/pmc: Cleanup SSRAM discovery")
Signed-off-by: Vamsi Krishna Brahmajosyula <vamsikrishna.brahmajosyula@...il.com>
---
 drivers/platform/x86/intel/pmc/core_ssram.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/pmc/core_ssram.c b/drivers/platform/x86/intel/pmc/core_ssram.c
index c259c96b7dfd..8504154b649f 100644
--- a/drivers/platform/x86/intel/pmc/core_ssram.c
+++ b/drivers/platform/x86/intel/pmc/core_ssram.c
@@ -29,7 +29,7 @@
 #define LPM_REG_COUNT		28
 #define LPM_MODE_OFFSET		1
 
-DEFINE_FREE(pmc_core_iounmap, void __iomem *, iounmap(_T));
+DEFINE_FREE(pmc_core_iounmap, void __iomem *, if (_T) iounmap(_T))
 
 static u32 pmc_core_find_guid(struct pmc_info *list, const struct pmc_reg_map *map)
 {
@@ -262,6 +262,8 @@ pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, int pmc_idx, u32 offset)
 
 	ssram_base = ssram_pcidev->resource[0].start;
 	tmp_ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
+	if (!tmp_ssram)
+		return -ENOMEM;
 
 	if (pmc_idx != PMC_IDX_MAIN) {
 		/*

base-commit: 2f87d0916ce0d2925cedbc9e8f5d6291ba2ac7b2
-- 
2.47.0

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