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Fri, 04 Apr 2025 10:46:34 -0700 (PDT) From: Jerome Brunet Date: Fri, 04 Apr 2025 19:46:22 +0200 Subject: [PATCH v2 3/3] PCI: endpoint: pci-epf-vntb: simplify ctrl/spad space allocation Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250404-pci-ep-size-alignment-v2-3-c3a0db4cfc57@baylibre.com> References: <20250404-pci-ep-size-alignment-v2-0-c3a0db4cfc57@baylibre.com> In-Reply-To: <20250404-pci-ep-size-alignment-v2-0-c3a0db4cfc57@baylibre.com> To: Manivannan Sadhasivam , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , Lorenzo Pieralisi , Jon Mason , Dave Jiang , Allen Hubbe Cc: Marek Vasut , Yoshihiro Shimoda , Yuya Hamamachi , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ntb@lists.linux.dev, Jerome Brunet X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; 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a=openpgp; fpr=F29F26CF27BAE1A9719AE6BDC3C92AAF3E60AED9 When allocating the shared ctrl/spad space, epf_ntb_config_spad_bar_alloc() should not try to handle the size quirks for underlying BAR, whether it is fixed size or alignment. This is already handled by pci_epf_alloc_space(). Also, when handling the alignment, this allocate more space than necessary. For example, with a spad size of 1024B and a ctrl size of 308B, the space necessary is 1332B. If the alignment is 1MB, epf_ntb_config_spad_bar_alloc() tries to allocate 2MB where 1MB would have been more than enough. Drop the handling of the BAR size quirks and let pci_epf_alloc_space() handle that. Just make sure the 32bits SPAD register are aligned on 32bits. Signed-off-by: Jerome Brunet --- drivers/pci/endpoint/functions/pci-epf-vntb.c | 26 +++--------------------= --- 1 file changed, 3 insertions(+), 23 deletions(-) diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/en= dpoint/functions/pci-epf-vntb.c index 8f59a5b9b7adec2c05eebae71c6a246bc5a8e88c..bc4a9c7c4338db6cc89fa47de89= dc704d0a03806 100644 --- a/drivers/pci/endpoint/functions/pci-epf-vntb.c +++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c @@ -413,11 +413,9 @@ static void epf_ntb_config_spad_bar_free(struct epf_nt= b *ntb) */ static int epf_ntb_config_spad_bar_alloc(struct epf_ntb *ntb) { - size_t align; enum pci_barno barno; struct epf_ntb_ctrl *ctrl; u32 spad_size, ctrl_size; - u64 size; struct pci_epf *epf =3D ntb->epf; struct device *dev =3D &epf->dev; u32 spad_count; @@ -427,31 +425,13 @@ static int epf_ntb_config_spad_bar_alloc(struct epf_n= tb *ntb) epf->func_no, epf->vfunc_no); barno =3D ntb->epf_ntb_bar[BAR_CONFIG]; - size =3D epc_features->bar[barno].fixed_size; - align =3D epc_features->align; - - if ((!IS_ALIGNED(size, align))) - return -EINVAL; - spad_count =3D ntb->spad_count; =20 - ctrl_size =3D sizeof(struct epf_ntb_ctrl); + ctrl_size =3D ALIGN(sizeof(struct epf_ntb_ctrl), sizeof(u32)); spad_size =3D 2 * spad_count * sizeof(u32); =20 - if (!align) { - ctrl_size =3D roundup_pow_of_two(ctrl_size); - spad_size =3D roundup_pow_of_two(spad_size); - } else { - ctrl_size =3D ALIGN(ctrl_size, align); - spad_size =3D ALIGN(spad_size, align); - } - - if (!size) - size =3D ctrl_size + spad_size; - else if (size < ctrl_size + spad_size) - return -EINVAL; - - base =3D pci_epf_alloc_space(epf, size, barno, epc_features, 0); + base =3D pci_epf_alloc_space(epf, ctrl_size + spad_size, + barno, epc_features, 0); if (!base) { dev_err(dev, "Config/Status/SPAD alloc region fail\n"); return -ENOMEM; --=20 2.47.2