From patchwork Thu Nov 14 13:03:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael J. 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Ruhl" To: intel-xe@lists.freedesktop.org, platform-driver-x86@vger.kernel.org, david.e.box@linux.intel.com, ilpo.jarvinen@linux.intel.com, andriy.shevchenko@linux.intel.com, hdegoede@redhat.com, rodrigo.vivi@intel.com, lucas.demarchi@intel.com Cc: michael.j.ruhl@intel.com Subject: [PATCH v3 1/2] platform/x86/intel/pmt: allow user offset for PMT callbacks Date: Thu, 14 Nov 2024 08:03:57 -0500 Message-ID: <20241114130358.2467787-2-michael.j.ruhl@intel.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20241114130358.2467787-1-michael.j.ruhl@intel.com> References: <20241114130358.2467787-1-michael.j.ruhl@intel.com> Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Usage of the telem sysfs file allows for partial reads at an offset. The current callback method returns the buffer starting from offset 0 only. Include the requested offset in the callback. Update the necessary address calculations with the offset. Note: offset addition is moved from the caller to the local usage. For non-callback usage this is unchanged behavior. Fixes: e92affc74cd8 ("platform/x86/intel/vsec: Add PMT read callbacks") Reviewed-by: Andy Shevchenko Signed-off-by: Michael J. Ruhl --- drivers/platform/x86/intel/pmt/class.c | 8 +++++--- drivers/platform/x86/intel/pmt/class.h | 2 +- drivers/platform/x86/intel/pmt/telemetry.c | 2 +- include/linux/intel_vsec.h | 3 ++- 4 files changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c index c04bb7f97a4d..c3ca2ac91b05 100644 --- a/drivers/platform/x86/intel/pmt/class.c +++ b/drivers/platform/x86/intel/pmt/class.c @@ -59,10 +59,12 @@ pmt_memcpy64_fromio(void *to, const u64 __iomem *from, size_t count) } int pmt_telem_read_mmio(struct pci_dev *pdev, struct pmt_callbacks *cb, u32 guid, void *buf, - void __iomem *addr, u32 count) + void __iomem *addr, loff_t off, u32 count) { if (cb && cb->read_telem) - return cb->read_telem(pdev, guid, buf, count); + return cb->read_telem(pdev, guid, buf, off, count); + + addr += off; if (guid == GUID_SPR_PUNIT) /* PUNIT on SPR only supports aligned 64-bit read */ @@ -96,7 +98,7 @@ intel_pmt_read(struct file *filp, struct kobject *kobj, count = entry->size - off; count = pmt_telem_read_mmio(entry->ep->pcidev, entry->cb, entry->header.guid, buf, - entry->base + off, count); + entry->base, off, count); return count; } diff --git a/drivers/platform/x86/intel/pmt/class.h b/drivers/platform/x86/intel/pmt/class.h index a267ac964423..b2006d57779d 100644 --- a/drivers/platform/x86/intel/pmt/class.h +++ b/drivers/platform/x86/intel/pmt/class.h @@ -62,7 +62,7 @@ struct intel_pmt_namespace { }; int pmt_telem_read_mmio(struct pci_dev *pdev, struct pmt_callbacks *cb, u32 guid, void *buf, - void __iomem *addr, u32 count); + void __iomem *addr, loff_t off, u32 count); bool intel_pmt_is_early_client_hw(struct device *dev); int intel_pmt_dev_create(struct intel_pmt_entry *entry, struct intel_pmt_namespace *ns, diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c index c9feac859e57..0cea617c6c2e 100644 --- a/drivers/platform/x86/intel/pmt/telemetry.c +++ b/drivers/platform/x86/intel/pmt/telemetry.c @@ -219,7 +219,7 @@ int pmt_telem_read(struct telem_endpoint *ep, u32 id, u64 *data, u32 count) if (offset + NUM_BYTES_QWORD(count) > size) return -EINVAL; - pmt_telem_read_mmio(ep->pcidev, ep->cb, ep->header.guid, data, ep->base + offset, + pmt_telem_read_mmio(ep->pcidev, ep->cb, ep->header.guid, data, ep->base, offset, NUM_BYTES_QWORD(count)); return ep->present ? 0 : -EPIPE; diff --git a/include/linux/intel_vsec.h b/include/linux/intel_vsec.h index 11ee185566c3..b94beab64610 100644 --- a/include/linux/intel_vsec.h +++ b/include/linux/intel_vsec.h @@ -74,10 +74,11 @@ enum intel_vsec_quirks { * @pdev: PCI device reference for the callback's use * @guid: ID of data to acccss * @data: buffer for the data to be copied + * @off: offset into the requested buffer * @count: size of buffer */ struct pmt_callbacks { - int (*read_telem)(struct pci_dev *pdev, u32 guid, u64 *data, u32 count); + int (*read_telem)(struct pci_dev *pdev, u32 guid, u64 *data, loff_t off, u32 count); }; /**