[PATCH v3 04/13] drivers/ata: Stop using 32-bit MSR interfaces
From: Juergen Gross <jgross@suse.com>
Date: 2026-09-11 07:46:08
Also in:
lkml
Subsystem:
libata subsystem (serial and parallel ata drivers), the rest · Maintainers:
Damien Le Moal, Niklas Cassel, Linus Torvalds
The 32-bit MSR interfaces rdmsr() and wrmsr() are planned to be removed. Use the related 64-bit variants instead. In drivers/ata/pata_cs5536.c don't redefine rdmsr() and wrmsr() as empty macros for avoiding misuse, but guard the affected code via a simple #ifdef. Switch pio_cmd_timings[] to a u32 type array in order to avoid a cast to u32 when constructing final MSR values. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Niklas Cassel <cassel@kernel.org> --- V2: - avoid sign extension when using wrmsrq() (Sashiko bot) V3: - use a u32 array for pio_cmd_timings (David Laight) --- drivers/ata/pata_cs5535.c | 24 ++++++++++++------------ drivers/ata/pata_cs5536.c | 17 ++++++++--------- 2 files changed, 20 insertions(+), 21 deletions(-)
diff --git a/drivers/ata/pata_cs5535.c b/drivers/ata/pata_cs5535.c
index d793fc441b46..512f9728224f 100644
--- a/drivers/ata/pata_cs5535.c
+++ b/drivers/ata/pata_cs5535.c@@ -87,10 +87,10 @@ static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev) static const u16 pio_timings[5] = { 0xF7F4, 0xF173, 0x8141, 0x5131, 0x1131 }; - static const u16 pio_cmd_timings[5] = { - 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131 + static const u32 pio_cmd_timings[5] = { + 0xF7F40000, 0x53F30000, 0x13F10000, 0x51310000, 0x11310000 }; - u32 reg, __maybe_unused dummy; + u32 reg; struct ata_device *pair = ata_dev_pair(adev); int mode = adev->pio_mode - XFER_PIO_0;
@@ -102,16 +102,16 @@ static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev) cmdmode = min(mode, pairmode); /* Write the other drive timing register if it changed */ if (cmdmode < pairmode) - wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno, - pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0); + wrmsrq(ATAC_CH0D0_PIO + 2 * pair->devno, + pio_cmd_timings[cmdmode] | pio_timings[pairmode]); } /* Write the drive timing register */ - wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno, - pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0); + wrmsrq(ATAC_CH0D0_PIO + 2 * adev->devno, + pio_cmd_timings[cmdmode] | pio_timings[mode]); /* Set the PIO "format 1" bit in the DMA timing register */ - rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy); - wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0); + rdmsrq(ATAC_CH0D0_DMA + 2 * adev->devno, reg); + wrmsrq(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL); } /**
@@ -129,16 +129,16 @@ static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev) static const u32 mwdma_timings[3] = { 0x7F0FFFF3, 0x7F035352, 0x7F024241 }; - u32 reg, __maybe_unused dummy; + u32 reg; int mode = adev->dma_mode; - rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy); + rdmsrq(ATAC_CH0D0_DMA + 2 * adev->devno, reg); reg &= 0x80000000UL; if (mode >= XFER_UDMA_0) reg |= udma_timings[mode - XFER_UDMA_0]; else reg |= mwdma_timings[mode - XFER_MW_DMA_0]; - wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0); + wrmsrq(ATAC_CH0D0_DMA + 2 * adev->devno, reg); } static const struct scsi_host_template cs5535_sht = {
diff --git a/drivers/ata/pata_cs5536.c b/drivers/ata/pata_cs5536.c
index 73e81e160c91..61d232a82b5e 100644
--- a/drivers/ata/pata_cs5536.c
+++ b/drivers/ata/pata_cs5536.c@@ -32,11 +32,8 @@ static int use_msr; module_param_named(msr, use_msr, int, 0644); MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)"); +#define MAYBE_USE_MSR #else -#undef rdmsr /* avoid accidental MSR usage on, e.g. x86-64 */ -#undef wrmsr -#define rdmsr(x, y, z) do { } while (0) -#define wrmsr(x, y, z) do { } while (0) #define use_msr 0 #endif
@@ -85,22 +82,24 @@ static const struct dmi_system_id udma_quirk_dmi_table[] = { static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val) { +#ifdef MAYBE_USE_MSR if (unlikely(use_msr)) { - u32 dummy __maybe_unused; - - rdmsr(MSR_IDE_CFG + reg, *val, dummy); + rdmsrq(MSR_IDE_CFG + reg, *val); return 0; } +#endif return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val); } -static int cs5536_write(struct pci_dev *pdev, int reg, int val) +static int cs5536_write(struct pci_dev *pdev, int reg, u32 val) { +#ifdef MAYBE_USE_MSR if (unlikely(use_msr)) { - wrmsr(MSR_IDE_CFG + reg, val, 0); + wrmsrq(MSR_IDE_CFG + reg, val); return 0; } +#endif return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val); }
--
2.55.0