diff options
Diffstat (limited to 'sound/pci/intel8x0.c')
| -rw-r--r-- | sound/pci/intel8x0.c | 67 |
1 files changed, 64 insertions, 3 deletions
diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c index 6a5b387b97f..11718b49b2e 100644 --- a/sound/pci/intel8x0.c +++ b/sound/pci/intel8x0.c @@ -32,7 +32,7 @@ #include <linux/init.h> #include <linux/pci.h> #include <linux/slab.h> -#include <linux/moduleparam.h> +#include <linux/module.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/ac97_codec.h> @@ -42,6 +42,12 @@ #include <asm/pgtable.h> #include <asm/cacheflush.h> +#ifdef CONFIG_KVM_GUEST +#include <linux/kvm_para.h> +#else +#define kvm_para_available() (0) +#endif + MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); MODULE_DESCRIPTION("Intel 82801AA,82901AB,i810,i820,i830,i840,i845,MX440; SiS 7012; Ali 5455"); MODULE_LICENSE("GPL"); @@ -77,6 +83,7 @@ static int buggy_semaphore; static int buggy_irq = -1; /* auto-check */ static int xbox; static int spdif_aclink = -1; +static int inside_vm = -1; module_param(index, int, 0444); MODULE_PARM_DESC(index, "Index value for Intel i8x0 soundcard."); @@ -94,6 +101,8 @@ module_param(xbox, bool, 0444); MODULE_PARM_DESC(xbox, "Set to 1 for Xbox, if you have problems with the AC'97 codec detection."); module_param(spdif_aclink, int, 0444); MODULE_PARM_DESC(spdif_aclink, "S/PDIF over AC-link."); +module_param(inside_vm, bool, 0444); +MODULE_PARM_DESC(inside_vm, "KVM/Parallels optimization."); /* just for backward compatibility */ static int enable; @@ -400,6 +409,7 @@ struct intel8x0 { unsigned buggy_irq: 1; /* workaround for buggy mobos */ unsigned xbox: 1; /* workaround for Xbox AC'97 detection */ unsigned buggy_semaphore: 1; /* workaround for buggy codec semaphore */ + unsigned inside_vm: 1; /* enable VM optimization */ int spdif_idx; /* SPDIF BAR index; *_SPBAR or -1 if use PCMOUT */ unsigned int sdm_saved; /* SDM reg value */ @@ -1065,8 +1075,18 @@ static snd_pcm_uframes_t snd_intel8x0_pcm_pointer(struct snd_pcm_substream *subs udelay(10); continue; } - if (civ == igetbyte(chip, ichdev->reg_offset + ICH_REG_OFF_CIV) && - ptr1 == igetword(chip, ichdev->reg_offset + ichdev->roff_picb)) + if (civ != igetbyte(chip, ichdev->reg_offset + ICH_REG_OFF_CIV)) + continue; + + /* IO read operation is very expensive inside virtual machine + * as it is emulated. The probability that subsequent PICB read + * will return different result is high enough to loop till + * timeout here. + * Same CIV is strict enough condition to be sure that PICB + * is valid inside VM on emulated card. */ + if (chip->inside_vm) + break; + if (ptr1 == igetword(chip, ichdev->reg_offset + ichdev->roff_picb)) break; } while (timeout--); ptr = ichdev->last_pos; @@ -2917,6 +2937,45 @@ static unsigned int sis_codec_bits[3] = { ICH_PCR, ICH_SCR, ICH_SIS_TCR }; +static int __devinit snd_intel8x0_inside_vm(struct pci_dev *pci) +{ + int result = inside_vm; + char *msg = NULL; + + /* check module parameter first (override detection) */ + if (result >= 0) { + msg = result ? "enable (forced) VM" : "disable (forced) VM"; + goto fini; + } + + /* detect KVM and Parallels virtual environments */ + result = kvm_para_available(); +#ifdef X86_FEATURE_HYPERVISOR + result = result || boot_cpu_has(X86_FEATURE_HYPERVISOR); +#endif + if (!result) + goto fini; + + /* check for known (emulated) devices */ + if (pci->subsystem_vendor == 0x1af4 && + pci->subsystem_device == 0x1100) { + /* KVM emulated sound, PCI SSID: 1af4:1100 */ + msg = "enable KVM"; + } else if (pci->subsystem_vendor == 0x1ab8) { + /* Parallels VM emulated sound, PCI SSID: 1ab8:xxxx */ + msg = "enable Parallels VM"; + } else { + msg = "disable (unknown or VT-d) VM"; + result = 0; + } + +fini: + if (msg != NULL) + printk(KERN_INFO "intel8x0: %s optimization\n", msg); + + return result; +} + static int __devinit snd_intel8x0_create(struct snd_card *card, struct pci_dev *pci, unsigned long device_type, @@ -2984,6 +3043,8 @@ static int __devinit snd_intel8x0_create(struct snd_card *card, if (xbox) chip->xbox = 1; + chip->inside_vm = snd_intel8x0_inside_vm(pci); + if (pci->vendor == PCI_VENDOR_ID_INTEL && pci->device == PCI_DEVICE_ID_INTEL_440MX) chip->fix_nocache = 1; /* enable workaround */ |